1 /* Fold a constant sub-tree into a single node for C-compiler
2 Copyright (C) 1987-2020 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
20 /*@@ This file should be rewritten to use an arbitrary precision
21 @@ representation for "struct tree_int_cst" and "struct tree_real_cst".
22 @@ Perhaps the routines could also be used for bc/dc, and made a lib.
23 @@ The routines that translate from the ap rep should
24 @@ warn if precision et. al. is lost.
25 @@ This would also make life easier when this technology is used
26 @@ for cross-compilers. */
28 /* The entry points in this file are fold, size_int_wide and size_binop.
30 fold takes a tree as argument and returns a simplified tree.
32 size_binop takes a tree code for an arithmetic operation
33 and two operands that are trees, and produces a tree for the
34 result, assuming the type comes from `sizetype'.
36 size_int takes an integer value, and creates a tree constant
37 with type from `sizetype'.
39 Note: Since the folders get called on non-gimple code as well as
40 gimple code, we need to handle GIMPLE tuples as well as their
41 corresponding tree equivalents. */
45 #include "coretypes.h"
54 #include "tree-ssa-operands.h"
55 #include "optabs-query.h"
57 #include "diagnostic-core.h"
60 #include "fold-const.h"
61 #include "fold-const-call.h"
62 #include "stor-layout.h"
64 #include "tree-iterator.h"
67 #include "langhooks.h"
72 #include "generic-match.h"
73 #include "gimple-fold.h"
74 #include "tree-into-ssa.h"
76 #include "case-cfn-macros.h"
77 #include "stringpool.h"
79 #include "tree-ssanames.h"
81 #include "stringpool.h"
83 #include "tree-vector-builder.h"
84 #include "vec-perm-indices.h"
86 /* Nonzero if we are folding constants inside an initializer; zero
88 int folding_initializer
= 0;
90 /* The following constants represent a bit based encoding of GCC's
91 comparison operators. This encoding simplifies transformations
92 on relational comparison operators, such as AND and OR. */
93 enum comparison_code
{
112 static bool negate_expr_p (tree
);
113 static tree
negate_expr (tree
);
114 static tree
associate_trees (location_t
, tree
, tree
, enum tree_code
, tree
);
115 static enum comparison_code
comparison_to_compcode (enum tree_code
);
116 static enum tree_code
compcode_to_comparison (enum comparison_code
);
117 static bool twoval_comparison_p (tree
, tree
*, tree
*);
118 static tree
eval_subst (location_t
, tree
, tree
, tree
, tree
, tree
);
119 static tree
optimize_bit_field_compare (location_t
, enum tree_code
,
121 static bool simple_operand_p (const_tree
);
122 static bool simple_operand_p_2 (tree
);
123 static tree
range_binop (enum tree_code
, tree
, tree
, int, tree
, int);
124 static tree
range_predecessor (tree
);
125 static tree
range_successor (tree
);
126 static tree
fold_range_test (location_t
, enum tree_code
, tree
, tree
, tree
);
127 static tree
fold_cond_expr_with_comparison (location_t
, tree
, tree
, tree
, tree
);
128 static tree
unextend (tree
, int, int, tree
);
129 static tree
extract_muldiv (tree
, tree
, enum tree_code
, tree
, bool *);
130 static tree
extract_muldiv_1 (tree
, tree
, enum tree_code
, tree
, bool *);
131 static tree
fold_binary_op_with_conditional_arg (location_t
,
132 enum tree_code
, tree
,
135 static tree
fold_negate_const (tree
, tree
);
136 static tree
fold_not_const (const_tree
, tree
);
137 static tree
fold_relational_const (enum tree_code
, tree
, tree
, tree
);
138 static tree
fold_convert_const (enum tree_code
, tree
, tree
);
139 static tree
fold_view_convert_expr (tree
, tree
);
140 static tree
fold_negate_expr (location_t
, tree
);
143 /* Return EXPR_LOCATION of T if it is not UNKNOWN_LOCATION.
144 Otherwise, return LOC. */
147 expr_location_or (tree t
, location_t loc
)
149 location_t tloc
= EXPR_LOCATION (t
);
150 return tloc
== UNKNOWN_LOCATION
? loc
: tloc
;
153 /* Similar to protected_set_expr_location, but never modify x in place,
154 if location can and needs to be set, unshare it. */
157 protected_set_expr_location_unshare (tree x
, location_t loc
)
159 if (CAN_HAVE_LOCATION_P (x
)
160 && EXPR_LOCATION (x
) != loc
161 && !(TREE_CODE (x
) == SAVE_EXPR
162 || TREE_CODE (x
) == TARGET_EXPR
163 || TREE_CODE (x
) == BIND_EXPR
))
166 SET_EXPR_LOCATION (x
, loc
);
171 /* If ARG2 divides ARG1 with zero remainder, carries out the exact
172 division and returns the quotient. Otherwise returns
176 div_if_zero_remainder (const_tree arg1
, const_tree arg2
)
180 if (wi::multiple_of_p (wi::to_widest (arg1
), wi::to_widest (arg2
),
182 return wide_int_to_tree (TREE_TYPE (arg1
), quo
);
187 /* This is nonzero if we should defer warnings about undefined
188 overflow. This facility exists because these warnings are a
189 special case. The code to estimate loop iterations does not want
190 to issue any warnings, since it works with expressions which do not
191 occur in user code. Various bits of cleanup code call fold(), but
192 only use the result if it has certain characteristics (e.g., is a
193 constant); that code only wants to issue a warning if the result is
196 static int fold_deferring_overflow_warnings
;
198 /* If a warning about undefined overflow is deferred, this is the
199 warning. Note that this may cause us to turn two warnings into
200 one, but that is fine since it is sufficient to only give one
201 warning per expression. */
203 static const char* fold_deferred_overflow_warning
;
205 /* If a warning about undefined overflow is deferred, this is the
206 level at which the warning should be emitted. */
208 static enum warn_strict_overflow_code fold_deferred_overflow_code
;
210 /* Start deferring overflow warnings. We could use a stack here to
211 permit nested calls, but at present it is not necessary. */
214 fold_defer_overflow_warnings (void)
216 ++fold_deferring_overflow_warnings
;
219 /* Stop deferring overflow warnings. If there is a pending warning,
220 and ISSUE is true, then issue the warning if appropriate. STMT is
221 the statement with which the warning should be associated (used for
222 location information); STMT may be NULL. CODE is the level of the
223 warning--a warn_strict_overflow_code value. This function will use
224 the smaller of CODE and the deferred code when deciding whether to
225 issue the warning. CODE may be zero to mean to always use the
229 fold_undefer_overflow_warnings (bool issue
, const gimple
*stmt
, int code
)
234 gcc_assert (fold_deferring_overflow_warnings
> 0);
235 --fold_deferring_overflow_warnings
;
236 if (fold_deferring_overflow_warnings
> 0)
238 if (fold_deferred_overflow_warning
!= NULL
240 && code
< (int) fold_deferred_overflow_code
)
241 fold_deferred_overflow_code
= (enum warn_strict_overflow_code
) code
;
245 warnmsg
= fold_deferred_overflow_warning
;
246 fold_deferred_overflow_warning
= NULL
;
248 if (!issue
|| warnmsg
== NULL
)
251 if (gimple_no_warning_p (stmt
))
254 /* Use the smallest code level when deciding to issue the
256 if (code
== 0 || code
> (int) fold_deferred_overflow_code
)
257 code
= fold_deferred_overflow_code
;
259 if (!issue_strict_overflow_warning (code
))
263 locus
= input_location
;
265 locus
= gimple_location (stmt
);
266 warning_at (locus
, OPT_Wstrict_overflow
, "%s", warnmsg
);
269 /* Stop deferring overflow warnings, ignoring any deferred
273 fold_undefer_and_ignore_overflow_warnings (void)
275 fold_undefer_overflow_warnings (false, NULL
, 0);
278 /* Whether we are deferring overflow warnings. */
281 fold_deferring_overflow_warnings_p (void)
283 return fold_deferring_overflow_warnings
> 0;
286 /* This is called when we fold something based on the fact that signed
287 overflow is undefined. */
290 fold_overflow_warning (const char* gmsgid
, enum warn_strict_overflow_code wc
)
292 if (fold_deferring_overflow_warnings
> 0)
294 if (fold_deferred_overflow_warning
== NULL
295 || wc
< fold_deferred_overflow_code
)
297 fold_deferred_overflow_warning
= gmsgid
;
298 fold_deferred_overflow_code
= wc
;
301 else if (issue_strict_overflow_warning (wc
))
302 warning (OPT_Wstrict_overflow
, gmsgid
);
305 /* Return true if the built-in mathematical function specified by CODE
306 is odd, i.e. -f(x) == f(-x). */
309 negate_mathfn_p (combined_fn fn
)
332 CASE_CFN_ROUNDEVEN_FN
:
344 return !flag_rounding_math
;
352 /* Check whether we may negate an integer constant T without causing
356 may_negate_without_overflow_p (const_tree t
)
360 gcc_assert (TREE_CODE (t
) == INTEGER_CST
);
362 type
= TREE_TYPE (t
);
363 if (TYPE_UNSIGNED (type
))
366 return !wi::only_sign_bit_p (wi::to_wide (t
));
369 /* Determine whether an expression T can be cheaply negated using
370 the function negate_expr without introducing undefined overflow. */
373 negate_expr_p (tree t
)
380 type
= TREE_TYPE (t
);
383 switch (TREE_CODE (t
))
386 if (INTEGRAL_TYPE_P (type
) && TYPE_UNSIGNED (type
))
389 /* Check that -CST will not overflow type. */
390 return may_negate_without_overflow_p (t
);
392 return (INTEGRAL_TYPE_P (type
)
393 && TYPE_OVERFLOW_WRAPS (type
));
399 return !TYPE_OVERFLOW_SANITIZED (type
);
402 /* We want to canonicalize to positive real constants. Pretend
403 that only negative ones can be easily negated. */
404 return REAL_VALUE_NEGATIVE (TREE_REAL_CST (t
));
407 return negate_expr_p (TREE_REALPART (t
))
408 && negate_expr_p (TREE_IMAGPART (t
));
412 if (FLOAT_TYPE_P (TREE_TYPE (type
)) || TYPE_OVERFLOW_WRAPS (type
))
415 /* Steps don't prevent negation. */
416 unsigned int count
= vector_cst_encoded_nelts (t
);
417 for (unsigned int i
= 0; i
< count
; ++i
)
418 if (!negate_expr_p (VECTOR_CST_ENCODED_ELT (t
, i
)))
425 return negate_expr_p (TREE_OPERAND (t
, 0))
426 && negate_expr_p (TREE_OPERAND (t
, 1));
429 return negate_expr_p (TREE_OPERAND (t
, 0));
432 if (HONOR_SIGN_DEPENDENT_ROUNDING (element_mode (type
))
433 || HONOR_SIGNED_ZEROS (element_mode (type
))
434 || (ANY_INTEGRAL_TYPE_P (type
)
435 && ! TYPE_OVERFLOW_WRAPS (type
)))
437 /* -(A + B) -> (-B) - A. */
438 if (negate_expr_p (TREE_OPERAND (t
, 1)))
440 /* -(A + B) -> (-A) - B. */
441 return negate_expr_p (TREE_OPERAND (t
, 0));
444 /* We can't turn -(A-B) into B-A when we honor signed zeros. */
445 return !HONOR_SIGN_DEPENDENT_ROUNDING (element_mode (type
))
446 && !HONOR_SIGNED_ZEROS (element_mode (type
))
447 && (! ANY_INTEGRAL_TYPE_P (type
)
448 || TYPE_OVERFLOW_WRAPS (type
));
451 if (TYPE_UNSIGNED (type
))
453 /* INT_MIN/n * n doesn't overflow while negating one operand it does
454 if n is a (negative) power of two. */
455 if (INTEGRAL_TYPE_P (TREE_TYPE (t
))
456 && ! TYPE_OVERFLOW_WRAPS (TREE_TYPE (t
))
457 && ! ((TREE_CODE (TREE_OPERAND (t
, 0)) == INTEGER_CST
459 (wi::abs (wi::to_wide (TREE_OPERAND (t
, 0))))) != 1)
460 || (TREE_CODE (TREE_OPERAND (t
, 1)) == INTEGER_CST
462 (wi::abs (wi::to_wide (TREE_OPERAND (t
, 1))))) != 1)))
468 if (! HONOR_SIGN_DEPENDENT_ROUNDING (element_mode (TREE_TYPE (t
))))
469 return negate_expr_p (TREE_OPERAND (t
, 1))
470 || negate_expr_p (TREE_OPERAND (t
, 0));
476 if (TYPE_UNSIGNED (type
))
478 /* In general we can't negate A in A / B, because if A is INT_MIN and
479 B is not 1 we change the sign of the result. */
480 if (TREE_CODE (TREE_OPERAND (t
, 0)) == INTEGER_CST
481 && negate_expr_p (TREE_OPERAND (t
, 0)))
483 /* In general we can't negate B in A / B, because if A is INT_MIN and
484 B is 1, we may turn this into INT_MIN / -1 which is undefined
485 and actually traps on some architectures. */
486 if (! ANY_INTEGRAL_TYPE_P (TREE_TYPE (t
))
487 || TYPE_OVERFLOW_WRAPS (TREE_TYPE (t
))
488 || (TREE_CODE (TREE_OPERAND (t
, 1)) == INTEGER_CST
489 && ! integer_onep (TREE_OPERAND (t
, 1))))
490 return negate_expr_p (TREE_OPERAND (t
, 1));
494 /* Negate -((double)float) as (double)(-float). */
495 if (TREE_CODE (type
) == REAL_TYPE
)
497 tree tem
= strip_float_extensions (t
);
499 return negate_expr_p (tem
);
504 /* Negate -f(x) as f(-x). */
505 if (negate_mathfn_p (get_call_combined_fn (t
)))
506 return negate_expr_p (CALL_EXPR_ARG (t
, 0));
510 /* Optimize -((int)x >> 31) into (unsigned)x >> 31 for int. */
511 if (TREE_CODE (TREE_OPERAND (t
, 1)) == INTEGER_CST
)
513 tree op1
= TREE_OPERAND (t
, 1);
514 if (wi::to_wide (op1
) == TYPE_PRECISION (type
) - 1)
525 /* Given T, an expression, return a folded tree for -T or NULL_TREE, if no
526 simplification is possible.
527 If negate_expr_p would return true for T, NULL_TREE will never be
531 fold_negate_expr_1 (location_t loc
, tree t
)
533 tree type
= TREE_TYPE (t
);
536 switch (TREE_CODE (t
))
538 /* Convert - (~A) to A + 1. */
540 if (INTEGRAL_TYPE_P (type
))
541 return fold_build2_loc (loc
, PLUS_EXPR
, type
, TREE_OPERAND (t
, 0),
542 build_one_cst (type
));
546 tem
= fold_negate_const (t
, type
);
547 if (TREE_OVERFLOW (tem
) == TREE_OVERFLOW (t
)
548 || (ANY_INTEGRAL_TYPE_P (type
)
549 && !TYPE_OVERFLOW_TRAPS (type
)
550 && TYPE_OVERFLOW_WRAPS (type
))
551 || (flag_sanitize
& SANITIZE_SI_OVERFLOW
) == 0)
558 tem
= fold_negate_const (t
, type
);
563 tree rpart
= fold_negate_expr (loc
, TREE_REALPART (t
));
564 tree ipart
= fold_negate_expr (loc
, TREE_IMAGPART (t
));
566 return build_complex (type
, rpart
, ipart
);
572 tree_vector_builder elts
;
573 elts
.new_unary_operation (type
, t
, true);
574 unsigned int count
= elts
.encoded_nelts ();
575 for (unsigned int i
= 0; i
< count
; ++i
)
577 tree elt
= fold_negate_expr (loc
, VECTOR_CST_ELT (t
, i
));
578 if (elt
== NULL_TREE
)
580 elts
.quick_push (elt
);
583 return elts
.build ();
587 if (negate_expr_p (t
))
588 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
,
589 fold_negate_expr (loc
, TREE_OPERAND (t
, 0)),
590 fold_negate_expr (loc
, TREE_OPERAND (t
, 1)));
594 if (negate_expr_p (t
))
595 return fold_build1_loc (loc
, CONJ_EXPR
, type
,
596 fold_negate_expr (loc
, TREE_OPERAND (t
, 0)));
600 if (!TYPE_OVERFLOW_SANITIZED (type
))
601 return TREE_OPERAND (t
, 0);
605 if (!HONOR_SIGN_DEPENDENT_ROUNDING (element_mode (type
))
606 && !HONOR_SIGNED_ZEROS (element_mode (type
)))
608 /* -(A + B) -> (-B) - A. */
609 if (negate_expr_p (TREE_OPERAND (t
, 1)))
611 tem
= negate_expr (TREE_OPERAND (t
, 1));
612 return fold_build2_loc (loc
, MINUS_EXPR
, type
,
613 tem
, TREE_OPERAND (t
, 0));
616 /* -(A + B) -> (-A) - B. */
617 if (negate_expr_p (TREE_OPERAND (t
, 0)))
619 tem
= negate_expr (TREE_OPERAND (t
, 0));
620 return fold_build2_loc (loc
, MINUS_EXPR
, type
,
621 tem
, TREE_OPERAND (t
, 1));
627 /* - (A - B) -> B - A */
628 if (!HONOR_SIGN_DEPENDENT_ROUNDING (element_mode (type
))
629 && !HONOR_SIGNED_ZEROS (element_mode (type
)))
630 return fold_build2_loc (loc
, MINUS_EXPR
, type
,
631 TREE_OPERAND (t
, 1), TREE_OPERAND (t
, 0));
635 if (TYPE_UNSIGNED (type
))
641 if (! HONOR_SIGN_DEPENDENT_ROUNDING (element_mode (type
)))
643 tem
= TREE_OPERAND (t
, 1);
644 if (negate_expr_p (tem
))
645 return fold_build2_loc (loc
, TREE_CODE (t
), type
,
646 TREE_OPERAND (t
, 0), negate_expr (tem
));
647 tem
= TREE_OPERAND (t
, 0);
648 if (negate_expr_p (tem
))
649 return fold_build2_loc (loc
, TREE_CODE (t
), type
,
650 negate_expr (tem
), TREE_OPERAND (t
, 1));
657 if (TYPE_UNSIGNED (type
))
659 /* In general we can't negate A in A / B, because if A is INT_MIN and
660 B is not 1 we change the sign of the result. */
661 if (TREE_CODE (TREE_OPERAND (t
, 0)) == INTEGER_CST
662 && negate_expr_p (TREE_OPERAND (t
, 0)))
663 return fold_build2_loc (loc
, TREE_CODE (t
), type
,
664 negate_expr (TREE_OPERAND (t
, 0)),
665 TREE_OPERAND (t
, 1));
666 /* In general we can't negate B in A / B, because if A is INT_MIN and
667 B is 1, we may turn this into INT_MIN / -1 which is undefined
668 and actually traps on some architectures. */
669 if ((! ANY_INTEGRAL_TYPE_P (TREE_TYPE (t
))
670 || TYPE_OVERFLOW_WRAPS (TREE_TYPE (t
))
671 || (TREE_CODE (TREE_OPERAND (t
, 1)) == INTEGER_CST
672 && ! integer_onep (TREE_OPERAND (t
, 1))))
673 && negate_expr_p (TREE_OPERAND (t
, 1)))
674 return fold_build2_loc (loc
, TREE_CODE (t
), type
,
676 negate_expr (TREE_OPERAND (t
, 1)));
680 /* Convert -((double)float) into (double)(-float). */
681 if (TREE_CODE (type
) == REAL_TYPE
)
683 tem
= strip_float_extensions (t
);
684 if (tem
!= t
&& negate_expr_p (tem
))
685 return fold_convert_loc (loc
, type
, negate_expr (tem
));
690 /* Negate -f(x) as f(-x). */
691 if (negate_mathfn_p (get_call_combined_fn (t
))
692 && negate_expr_p (CALL_EXPR_ARG (t
, 0)))
696 fndecl
= get_callee_fndecl (t
);
697 arg
= negate_expr (CALL_EXPR_ARG (t
, 0));
698 return build_call_expr_loc (loc
, fndecl
, 1, arg
);
703 /* Optimize -((int)x >> 31) into (unsigned)x >> 31 for int. */
704 if (TREE_CODE (TREE_OPERAND (t
, 1)) == INTEGER_CST
)
706 tree op1
= TREE_OPERAND (t
, 1);
707 if (wi::to_wide (op1
) == TYPE_PRECISION (type
) - 1)
709 tree ntype
= TYPE_UNSIGNED (type
)
710 ? signed_type_for (type
)
711 : unsigned_type_for (type
);
712 tree temp
= fold_convert_loc (loc
, ntype
, TREE_OPERAND (t
, 0));
713 temp
= fold_build2_loc (loc
, RSHIFT_EXPR
, ntype
, temp
, op1
);
714 return fold_convert_loc (loc
, type
, temp
);
726 /* A wrapper for fold_negate_expr_1. */
729 fold_negate_expr (location_t loc
, tree t
)
731 tree type
= TREE_TYPE (t
);
733 tree tem
= fold_negate_expr_1 (loc
, t
);
734 if (tem
== NULL_TREE
)
736 return fold_convert_loc (loc
, type
, tem
);
739 /* Like fold_negate_expr, but return a NEGATE_EXPR tree, if T cannot be
740 negated in a simpler way. Also allow for T to be NULL_TREE, in which case
752 loc
= EXPR_LOCATION (t
);
753 type
= TREE_TYPE (t
);
756 tem
= fold_negate_expr (loc
, t
);
758 tem
= build1_loc (loc
, NEGATE_EXPR
, TREE_TYPE (t
), t
);
759 return fold_convert_loc (loc
, type
, tem
);
762 /* Split a tree IN into a constant, literal and variable parts that could be
763 combined with CODE to make IN. "constant" means an expression with
764 TREE_CONSTANT but that isn't an actual constant. CODE must be a
765 commutative arithmetic operation. Store the constant part into *CONP,
766 the literal in *LITP and return the variable part. If a part isn't
767 present, set it to null. If the tree does not decompose in this way,
768 return the entire tree as the variable part and the other parts as null.
770 If CODE is PLUS_EXPR we also split trees that use MINUS_EXPR. In that
771 case, we negate an operand that was subtracted. Except if it is a
772 literal for which we use *MINUS_LITP instead.
774 If NEGATE_P is true, we are negating all of IN, again except a literal
775 for which we use *MINUS_LITP instead. If a variable part is of pointer
776 type, it is negated after converting to TYPE. This prevents us from
777 generating illegal MINUS pointer expression. LOC is the location of
778 the converted variable part.
780 If IN is itself a literal or constant, return it as appropriate.
782 Note that we do not guarantee that any of the three values will be the
783 same type as IN, but they will have the same signedness and mode. */
786 split_tree (tree in
, tree type
, enum tree_code code
,
787 tree
*minus_varp
, tree
*conp
, tree
*minus_conp
,
788 tree
*litp
, tree
*minus_litp
, int negate_p
)
797 /* Strip any conversions that don't change the machine mode or signedness. */
798 STRIP_SIGN_NOPS (in
);
800 if (TREE_CODE (in
) == INTEGER_CST
|| TREE_CODE (in
) == REAL_CST
801 || TREE_CODE (in
) == FIXED_CST
)
803 else if (TREE_CODE (in
) == code
804 || ((! FLOAT_TYPE_P (TREE_TYPE (in
)) || flag_associative_math
)
805 && ! SAT_FIXED_POINT_TYPE_P (TREE_TYPE (in
))
806 /* We can associate addition and subtraction together (even
807 though the C standard doesn't say so) for integers because
808 the value is not affected. For reals, the value might be
809 affected, so we can't. */
810 && ((code
== PLUS_EXPR
&& TREE_CODE (in
) == POINTER_PLUS_EXPR
)
811 || (code
== PLUS_EXPR
&& TREE_CODE (in
) == MINUS_EXPR
)
812 || (code
== MINUS_EXPR
813 && (TREE_CODE (in
) == PLUS_EXPR
814 || TREE_CODE (in
) == POINTER_PLUS_EXPR
)))))
816 tree op0
= TREE_OPERAND (in
, 0);
817 tree op1
= TREE_OPERAND (in
, 1);
818 int neg1_p
= TREE_CODE (in
) == MINUS_EXPR
;
819 int neg_litp_p
= 0, neg_conp_p
= 0, neg_var_p
= 0;
821 /* First see if either of the operands is a literal, then a constant. */
822 if (TREE_CODE (op0
) == INTEGER_CST
|| TREE_CODE (op0
) == REAL_CST
823 || TREE_CODE (op0
) == FIXED_CST
)
824 *litp
= op0
, op0
= 0;
825 else if (TREE_CODE (op1
) == INTEGER_CST
|| TREE_CODE (op1
) == REAL_CST
826 || TREE_CODE (op1
) == FIXED_CST
)
827 *litp
= op1
, neg_litp_p
= neg1_p
, op1
= 0;
829 if (op0
!= 0 && TREE_CONSTANT (op0
))
830 *conp
= op0
, op0
= 0;
831 else if (op1
!= 0 && TREE_CONSTANT (op1
))
832 *conp
= op1
, neg_conp_p
= neg1_p
, op1
= 0;
834 /* If we haven't dealt with either operand, this is not a case we can
835 decompose. Otherwise, VAR is either of the ones remaining, if any. */
836 if (op0
!= 0 && op1
!= 0)
841 var
= op1
, neg_var_p
= neg1_p
;
843 /* Now do any needed negations. */
845 *minus_litp
= *litp
, *litp
= 0;
846 if (neg_conp_p
&& *conp
)
847 *minus_conp
= *conp
, *conp
= 0;
848 if (neg_var_p
&& var
)
849 *minus_varp
= var
, var
= 0;
851 else if (TREE_CONSTANT (in
))
853 else if (TREE_CODE (in
) == BIT_NOT_EXPR
854 && code
== PLUS_EXPR
)
856 /* -1 - X is folded to ~X, undo that here. Do _not_ do this
857 when IN is constant. */
858 *litp
= build_minus_one_cst (type
);
859 *minus_varp
= TREE_OPERAND (in
, 0);
867 *minus_litp
= *litp
, *litp
= 0;
868 else if (*minus_litp
)
869 *litp
= *minus_litp
, *minus_litp
= 0;
871 *minus_conp
= *conp
, *conp
= 0;
872 else if (*minus_conp
)
873 *conp
= *minus_conp
, *minus_conp
= 0;
875 *minus_varp
= var
, var
= 0;
876 else if (*minus_varp
)
877 var
= *minus_varp
, *minus_varp
= 0;
881 && TREE_OVERFLOW_P (*litp
))
882 *litp
= drop_tree_overflow (*litp
);
884 && TREE_OVERFLOW_P (*minus_litp
))
885 *minus_litp
= drop_tree_overflow (*minus_litp
);
890 /* Re-associate trees split by the above function. T1 and T2 are
891 either expressions to associate or null. Return the new
892 expression, if any. LOC is the location of the new expression. If
893 we build an operation, do it in TYPE and with CODE. */
896 associate_trees (location_t loc
, tree t1
, tree t2
, enum tree_code code
, tree type
)
900 gcc_assert (t2
== 0 || code
!= MINUS_EXPR
);
906 /* If either input is CODE, a PLUS_EXPR, or a MINUS_EXPR, don't
907 try to fold this since we will have infinite recursion. But do
908 deal with any NEGATE_EXPRs. */
909 if (TREE_CODE (t1
) == code
|| TREE_CODE (t2
) == code
910 || TREE_CODE (t1
) == PLUS_EXPR
|| TREE_CODE (t2
) == PLUS_EXPR
911 || TREE_CODE (t1
) == MINUS_EXPR
|| TREE_CODE (t2
) == MINUS_EXPR
)
913 if (code
== PLUS_EXPR
)
915 if (TREE_CODE (t1
) == NEGATE_EXPR
)
916 return build2_loc (loc
, MINUS_EXPR
, type
,
917 fold_convert_loc (loc
, type
, t2
),
918 fold_convert_loc (loc
, type
,
919 TREE_OPERAND (t1
, 0)));
920 else if (TREE_CODE (t2
) == NEGATE_EXPR
)
921 return build2_loc (loc
, MINUS_EXPR
, type
,
922 fold_convert_loc (loc
, type
, t1
),
923 fold_convert_loc (loc
, type
,
924 TREE_OPERAND (t2
, 0)));
925 else if (integer_zerop (t2
))
926 return fold_convert_loc (loc
, type
, t1
);
928 else if (code
== MINUS_EXPR
)
930 if (integer_zerop (t2
))
931 return fold_convert_loc (loc
, type
, t1
);
934 return build2_loc (loc
, code
, type
, fold_convert_loc (loc
, type
, t1
),
935 fold_convert_loc (loc
, type
, t2
));
938 return fold_build2_loc (loc
, code
, type
, fold_convert_loc (loc
, type
, t1
),
939 fold_convert_loc (loc
, type
, t2
));
942 /* Check whether TYPE1 and TYPE2 are equivalent integer types, suitable
943 for use in int_const_binop, size_binop and size_diffop. */
946 int_binop_types_match_p (enum tree_code code
, const_tree type1
, const_tree type2
)
948 if (!INTEGRAL_TYPE_P (type1
) && !POINTER_TYPE_P (type1
))
950 if (!INTEGRAL_TYPE_P (type2
) && !POINTER_TYPE_P (type2
))
965 return TYPE_UNSIGNED (type1
) == TYPE_UNSIGNED (type2
)
966 && TYPE_PRECISION (type1
) == TYPE_PRECISION (type2
)
967 && TYPE_MODE (type1
) == TYPE_MODE (type2
);
970 /* Combine two wide ints ARG1 and ARG2 under operation CODE to produce
971 a new constant in RES. Return FALSE if we don't know how to
972 evaluate CODE at compile-time. */
975 wide_int_binop (wide_int
&res
,
976 enum tree_code code
, const wide_int
&arg1
, const wide_int
&arg2
,
977 signop sign
, wi::overflow_type
*overflow
)
980 *overflow
= wi::OVF_NONE
;
984 res
= wi::bit_or (arg1
, arg2
);
988 res
= wi::bit_xor (arg1
, arg2
);
992 res
= wi::bit_and (arg1
, arg2
);
997 if (wi::neg_p (arg2
))
1000 if (code
== RSHIFT_EXPR
)
1008 if (code
== RSHIFT_EXPR
)
1009 /* It's unclear from the C standard whether shifts can overflow.
1010 The following code ignores overflow; perhaps a C standard
1011 interpretation ruling is needed. */
1012 res
= wi::rshift (arg1
, tmp
, sign
);
1014 res
= wi::lshift (arg1
, tmp
);
1019 if (wi::neg_p (arg2
))
1022 if (code
== RROTATE_EXPR
)
1023 code
= LROTATE_EXPR
;
1025 code
= RROTATE_EXPR
;
1030 if (code
== RROTATE_EXPR
)
1031 res
= wi::rrotate (arg1
, tmp
);
1033 res
= wi::lrotate (arg1
, tmp
);
1037 res
= wi::add (arg1
, arg2
, sign
, overflow
);
1041 res
= wi::sub (arg1
, arg2
, sign
, overflow
);
1045 res
= wi::mul (arg1
, arg2
, sign
, overflow
);
1048 case MULT_HIGHPART_EXPR
:
1049 res
= wi::mul_high (arg1
, arg2
, sign
);
1052 case TRUNC_DIV_EXPR
:
1053 case EXACT_DIV_EXPR
:
1056 res
= wi::div_trunc (arg1
, arg2
, sign
, overflow
);
1059 case FLOOR_DIV_EXPR
:
1062 res
= wi::div_floor (arg1
, arg2
, sign
, overflow
);
1068 res
= wi::div_ceil (arg1
, arg2
, sign
, overflow
);
1071 case ROUND_DIV_EXPR
:
1074 res
= wi::div_round (arg1
, arg2
, sign
, overflow
);
1077 case TRUNC_MOD_EXPR
:
1080 res
= wi::mod_trunc (arg1
, arg2
, sign
, overflow
);
1083 case FLOOR_MOD_EXPR
:
1086 res
= wi::mod_floor (arg1
, arg2
, sign
, overflow
);
1092 res
= wi::mod_ceil (arg1
, arg2
, sign
, overflow
);
1095 case ROUND_MOD_EXPR
:
1098 res
= wi::mod_round (arg1
, arg2
, sign
, overflow
);
1102 res
= wi::min (arg1
, arg2
, sign
);
1106 res
= wi::max (arg1
, arg2
, sign
);
1115 /* Combine two poly int's ARG1 and ARG2 under operation CODE to
1116 produce a new constant in RES. Return FALSE if we don't know how
1117 to evaluate CODE at compile-time. */
1120 poly_int_binop (poly_wide_int
&res
, enum tree_code code
,
1121 const_tree arg1
, const_tree arg2
,
1122 signop sign
, wi::overflow_type
*overflow
)
1124 gcc_assert (NUM_POLY_INT_COEFFS
!= 1);
1125 gcc_assert (poly_int_tree_p (arg1
) && poly_int_tree_p (arg2
));
1129 res
= wi::add (wi::to_poly_wide (arg1
),
1130 wi::to_poly_wide (arg2
), sign
, overflow
);
1134 res
= wi::sub (wi::to_poly_wide (arg1
),
1135 wi::to_poly_wide (arg2
), sign
, overflow
);
1139 if (TREE_CODE (arg2
) == INTEGER_CST
)
1140 res
= wi::mul (wi::to_poly_wide (arg1
),
1141 wi::to_wide (arg2
), sign
, overflow
);
1142 else if (TREE_CODE (arg1
) == INTEGER_CST
)
1143 res
= wi::mul (wi::to_poly_wide (arg2
),
1144 wi::to_wide (arg1
), sign
, overflow
);
1150 if (TREE_CODE (arg2
) == INTEGER_CST
)
1151 res
= wi::to_poly_wide (arg1
) << wi::to_wide (arg2
);
1157 if (TREE_CODE (arg2
) != INTEGER_CST
1158 || !can_ior_p (wi::to_poly_wide (arg1
), wi::to_wide (arg2
),
1169 /* Combine two integer constants ARG1 and ARG2 under operation CODE to
1170 produce a new constant. Return NULL_TREE if we don't know how to
1171 evaluate CODE at compile-time. */
1174 int_const_binop (enum tree_code code
, const_tree arg1
, const_tree arg2
,
1177 poly_wide_int poly_res
;
1178 tree type
= TREE_TYPE (arg1
);
1179 signop sign
= TYPE_SIGN (type
);
1180 wi::overflow_type overflow
= wi::OVF_NONE
;
1182 if (TREE_CODE (arg1
) == INTEGER_CST
&& TREE_CODE (arg2
) == INTEGER_CST
)
1184 wide_int warg1
= wi::to_wide (arg1
), res
;
1185 wide_int warg2
= wi::to_wide (arg2
, TYPE_PRECISION (type
));
1186 if (!wide_int_binop (res
, code
, warg1
, warg2
, sign
, &overflow
))
1190 else if (!poly_int_tree_p (arg1
)
1191 || !poly_int_tree_p (arg2
)
1192 || !poly_int_binop (poly_res
, code
, arg1
, arg2
, sign
, &overflow
))
1194 return force_fit_type (type
, poly_res
, overflowable
,
1195 (((sign
== SIGNED
|| overflowable
== -1)
1197 | TREE_OVERFLOW (arg1
) | TREE_OVERFLOW (arg2
)));
1200 /* Return true if binary operation OP distributes over addition in operand
1201 OPNO, with the other operand being held constant. OPNO counts from 1. */
1204 distributes_over_addition_p (tree_code op
, int opno
)
1221 /* Combine two constants ARG1 and ARG2 under operation CODE to produce a new
1222 constant. We assume ARG1 and ARG2 have the same data type, or at least
1223 are the same kind of constant and the same machine mode. Return zero if
1224 combining the constants is not allowed in the current operating mode. */
1227 const_binop (enum tree_code code
, tree arg1
, tree arg2
)
1229 /* Sanity check for the recursive cases. */
1236 if (poly_int_tree_p (arg1
) && poly_int_tree_p (arg2
))
1238 if (code
== POINTER_PLUS_EXPR
)
1239 return int_const_binop (PLUS_EXPR
,
1240 arg1
, fold_convert (TREE_TYPE (arg1
), arg2
));
1242 return int_const_binop (code
, arg1
, arg2
);
1245 if (TREE_CODE (arg1
) == REAL_CST
&& TREE_CODE (arg2
) == REAL_CST
)
1250 REAL_VALUE_TYPE value
;
1251 REAL_VALUE_TYPE result
;
1255 /* The following codes are handled by real_arithmetic. */
1270 d1
= TREE_REAL_CST (arg1
);
1271 d2
= TREE_REAL_CST (arg2
);
1273 type
= TREE_TYPE (arg1
);
1274 mode
= TYPE_MODE (type
);
1276 /* Don't perform operation if we honor signaling NaNs and
1277 either operand is a signaling NaN. */
1278 if (HONOR_SNANS (mode
)
1279 && (REAL_VALUE_ISSIGNALING_NAN (d1
)
1280 || REAL_VALUE_ISSIGNALING_NAN (d2
)))
1283 /* Don't perform operation if it would raise a division
1284 by zero exception. */
1285 if (code
== RDIV_EXPR
1286 && real_equal (&d2
, &dconst0
)
1287 && (flag_trapping_math
|| ! MODE_HAS_INFINITIES (mode
)))
1290 /* If either operand is a NaN, just return it. Otherwise, set up
1291 for floating-point trap; we return an overflow. */
1292 if (REAL_VALUE_ISNAN (d1
))
1294 /* Make resulting NaN value to be qNaN when flag_signaling_nans
1297 t
= build_real (type
, d1
);
1300 else if (REAL_VALUE_ISNAN (d2
))
1302 /* Make resulting NaN value to be qNaN when flag_signaling_nans
1305 t
= build_real (type
, d2
);
1309 inexact
= real_arithmetic (&value
, code
, &d1
, &d2
);
1310 real_convert (&result
, mode
, &value
);
1312 /* Don't constant fold this floating point operation if
1313 the result has overflowed and flag_trapping_math. */
1314 if (flag_trapping_math
1315 && MODE_HAS_INFINITIES (mode
)
1316 && REAL_VALUE_ISINF (result
)
1317 && !REAL_VALUE_ISINF (d1
)
1318 && !REAL_VALUE_ISINF (d2
))
1321 /* Don't constant fold this floating point operation if the
1322 result may dependent upon the run-time rounding mode and
1323 flag_rounding_math is set, or if GCC's software emulation
1324 is unable to accurately represent the result. */
1325 if ((flag_rounding_math
1326 || (MODE_COMPOSITE_P (mode
) && !flag_unsafe_math_optimizations
))
1327 && (inexact
|| !real_identical (&result
, &value
)))
1330 t
= build_real (type
, result
);
1332 TREE_OVERFLOW (t
) = TREE_OVERFLOW (arg1
) | TREE_OVERFLOW (arg2
);
1336 if (TREE_CODE (arg1
) == FIXED_CST
)
1338 FIXED_VALUE_TYPE f1
;
1339 FIXED_VALUE_TYPE f2
;
1340 FIXED_VALUE_TYPE result
;
1345 /* The following codes are handled by fixed_arithmetic. */
1351 case TRUNC_DIV_EXPR
:
1352 if (TREE_CODE (arg2
) != FIXED_CST
)
1354 f2
= TREE_FIXED_CST (arg2
);
1360 if (TREE_CODE (arg2
) != INTEGER_CST
)
1362 wi::tree_to_wide_ref w2
= wi::to_wide (arg2
);
1363 f2
.data
.high
= w2
.elt (1);
1364 f2
.data
.low
= w2
.ulow ();
1373 f1
= TREE_FIXED_CST (arg1
);
1374 type
= TREE_TYPE (arg1
);
1375 sat_p
= TYPE_SATURATING (type
);
1376 overflow_p
= fixed_arithmetic (&result
, code
, &f1
, &f2
, sat_p
);
1377 t
= build_fixed (type
, result
);
1378 /* Propagate overflow flags. */
1379 if (overflow_p
| TREE_OVERFLOW (arg1
) | TREE_OVERFLOW (arg2
))
1380 TREE_OVERFLOW (t
) = 1;
1384 if (TREE_CODE (arg1
) == COMPLEX_CST
&& TREE_CODE (arg2
) == COMPLEX_CST
)
1386 tree type
= TREE_TYPE (arg1
);
1387 tree r1
= TREE_REALPART (arg1
);
1388 tree i1
= TREE_IMAGPART (arg1
);
1389 tree r2
= TREE_REALPART (arg2
);
1390 tree i2
= TREE_IMAGPART (arg2
);
1397 real
= const_binop (code
, r1
, r2
);
1398 imag
= const_binop (code
, i1
, i2
);
1402 if (COMPLEX_FLOAT_TYPE_P (type
))
1403 return do_mpc_arg2 (arg1
, arg2
, type
,
1404 /* do_nonfinite= */ folding_initializer
,
1407 real
= const_binop (MINUS_EXPR
,
1408 const_binop (MULT_EXPR
, r1
, r2
),
1409 const_binop (MULT_EXPR
, i1
, i2
));
1410 imag
= const_binop (PLUS_EXPR
,
1411 const_binop (MULT_EXPR
, r1
, i2
),
1412 const_binop (MULT_EXPR
, i1
, r2
));
1416 if (COMPLEX_FLOAT_TYPE_P (type
))
1417 return do_mpc_arg2 (arg1
, arg2
, type
,
1418 /* do_nonfinite= */ folding_initializer
,
1421 case TRUNC_DIV_EXPR
:
1423 case FLOOR_DIV_EXPR
:
1424 case ROUND_DIV_EXPR
:
1425 if (flag_complex_method
== 0)
1427 /* Keep this algorithm in sync with
1428 tree-complex.c:expand_complex_div_straight().
1430 Expand complex division to scalars, straightforward algorithm.
1431 a / b = ((ar*br + ai*bi)/t) + i((ai*br - ar*bi)/t)
1435 = const_binop (PLUS_EXPR
,
1436 const_binop (MULT_EXPR
, r2
, r2
),
1437 const_binop (MULT_EXPR
, i2
, i2
));
1439 = const_binop (PLUS_EXPR
,
1440 const_binop (MULT_EXPR
, r1
, r2
),
1441 const_binop (MULT_EXPR
, i1
, i2
));
1443 = const_binop (MINUS_EXPR
,
1444 const_binop (MULT_EXPR
, i1
, r2
),
1445 const_binop (MULT_EXPR
, r1
, i2
));
1447 real
= const_binop (code
, t1
, magsquared
);
1448 imag
= const_binop (code
, t2
, magsquared
);
1452 /* Keep this algorithm in sync with
1453 tree-complex.c:expand_complex_div_wide().
1455 Expand complex division to scalars, modified algorithm to minimize
1456 overflow with wide input ranges. */
1457 tree compare
= fold_build2 (LT_EXPR
, boolean_type_node
,
1458 fold_abs_const (r2
, TREE_TYPE (type
)),
1459 fold_abs_const (i2
, TREE_TYPE (type
)));
1461 if (integer_nonzerop (compare
))
1463 /* In the TRUE branch, we compute
1465 div = (br * ratio) + bi;
1466 tr = (ar * ratio) + ai;
1467 ti = (ai * ratio) - ar;
1470 tree ratio
= const_binop (code
, r2
, i2
);
1471 tree div
= const_binop (PLUS_EXPR
, i2
,
1472 const_binop (MULT_EXPR
, r2
, ratio
));
1473 real
= const_binop (MULT_EXPR
, r1
, ratio
);
1474 real
= const_binop (PLUS_EXPR
, real
, i1
);
1475 real
= const_binop (code
, real
, div
);
1477 imag
= const_binop (MULT_EXPR
, i1
, ratio
);
1478 imag
= const_binop (MINUS_EXPR
, imag
, r1
);
1479 imag
= const_binop (code
, imag
, div
);
1483 /* In the FALSE branch, we compute
1485 divisor = (d * ratio) + c;
1486 tr = (b * ratio) + a;
1487 ti = b - (a * ratio);
1490 tree ratio
= const_binop (code
, i2
, r2
);
1491 tree div
= const_binop (PLUS_EXPR
, r2
,
1492 const_binop (MULT_EXPR
, i2
, ratio
));
1494 real
= const_binop (MULT_EXPR
, i1
, ratio
);
1495 real
= const_binop (PLUS_EXPR
, real
, r1
);
1496 real
= const_binop (code
, real
, div
);
1498 imag
= const_binop (MULT_EXPR
, r1
, ratio
);
1499 imag
= const_binop (MINUS_EXPR
, i1
, imag
);
1500 imag
= const_binop (code
, imag
, div
);
1510 return build_complex (type
, real
, imag
);
1513 if (TREE_CODE (arg1
) == VECTOR_CST
1514 && TREE_CODE (arg2
) == VECTOR_CST
1515 && known_eq (TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg1
)),
1516 TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg2
))))
1518 tree type
= TREE_TYPE (arg1
);
1520 if (VECTOR_CST_STEPPED_P (arg1
)
1521 && VECTOR_CST_STEPPED_P (arg2
))
1522 /* We can operate directly on the encoding if:
1524 a3 - a2 == a2 - a1 && b3 - b2 == b2 - b1
1526 (a3 op b3) - (a2 op b2) == (a2 op b2) - (a1 op b1)
1528 Addition and subtraction are the supported operators
1529 for which this is true. */
1530 step_ok_p
= (code
== PLUS_EXPR
|| code
== MINUS_EXPR
);
1531 else if (VECTOR_CST_STEPPED_P (arg1
))
1532 /* We can operate directly on stepped encodings if:
1536 (a3 op c) - (a2 op c) == (a2 op c) - (a1 op c)
1538 which is true if (x -> x op c) distributes over addition. */
1539 step_ok_p
= distributes_over_addition_p (code
, 1);
1541 /* Similarly in reverse. */
1542 step_ok_p
= distributes_over_addition_p (code
, 2);
1543 tree_vector_builder elts
;
1544 if (!elts
.new_binary_operation (type
, arg1
, arg2
, step_ok_p
))
1546 unsigned int count
= elts
.encoded_nelts ();
1547 for (unsigned int i
= 0; i
< count
; ++i
)
1549 tree elem1
= VECTOR_CST_ELT (arg1
, i
);
1550 tree elem2
= VECTOR_CST_ELT (arg2
, i
);
1552 tree elt
= const_binop (code
, elem1
, elem2
);
1554 /* It is possible that const_binop cannot handle the given
1555 code and return NULL_TREE */
1556 if (elt
== NULL_TREE
)
1558 elts
.quick_push (elt
);
1561 return elts
.build ();
1564 /* Shifts allow a scalar offset for a vector. */
1565 if (TREE_CODE (arg1
) == VECTOR_CST
1566 && TREE_CODE (arg2
) == INTEGER_CST
)
1568 tree type
= TREE_TYPE (arg1
);
1569 bool step_ok_p
= distributes_over_addition_p (code
, 1);
1570 tree_vector_builder elts
;
1571 if (!elts
.new_unary_operation (type
, arg1
, step_ok_p
))
1573 unsigned int count
= elts
.encoded_nelts ();
1574 for (unsigned int i
= 0; i
< count
; ++i
)
1576 tree elem1
= VECTOR_CST_ELT (arg1
, i
);
1578 tree elt
= const_binop (code
, elem1
, arg2
);
1580 /* It is possible that const_binop cannot handle the given
1581 code and return NULL_TREE. */
1582 if (elt
== NULL_TREE
)
1584 elts
.quick_push (elt
);
1587 return elts
.build ();
1592 /* Overload that adds a TYPE parameter to be able to dispatch
1593 to fold_relational_const. */
1596 const_binop (enum tree_code code
, tree type
, tree arg1
, tree arg2
)
1598 if (TREE_CODE_CLASS (code
) == tcc_comparison
)
1599 return fold_relational_const (code
, type
, arg1
, arg2
);
1601 /* ??? Until we make the const_binop worker take the type of the
1602 result as argument put those cases that need it here. */
1605 case VEC_SERIES_EXPR
:
1606 if (CONSTANT_CLASS_P (arg1
)
1607 && CONSTANT_CLASS_P (arg2
))
1608 return build_vec_series (type
, arg1
, arg2
);
1612 if ((TREE_CODE (arg1
) == REAL_CST
1613 && TREE_CODE (arg2
) == REAL_CST
)
1614 || (TREE_CODE (arg1
) == INTEGER_CST
1615 && TREE_CODE (arg2
) == INTEGER_CST
))
1616 return build_complex (type
, arg1
, arg2
);
1619 case POINTER_DIFF_EXPR
:
1620 if (poly_int_tree_p (arg1
) && poly_int_tree_p (arg2
))
1622 poly_offset_int res
= (wi::to_poly_offset (arg1
)
1623 - wi::to_poly_offset (arg2
));
1624 return force_fit_type (type
, res
, 1,
1625 TREE_OVERFLOW (arg1
) | TREE_OVERFLOW (arg2
));
1629 case VEC_PACK_TRUNC_EXPR
:
1630 case VEC_PACK_FIX_TRUNC_EXPR
:
1631 case VEC_PACK_FLOAT_EXPR
:
1633 unsigned int HOST_WIDE_INT out_nelts
, in_nelts
, i
;
1635 if (TREE_CODE (arg1
) != VECTOR_CST
1636 || TREE_CODE (arg2
) != VECTOR_CST
)
1639 if (!VECTOR_CST_NELTS (arg1
).is_constant (&in_nelts
))
1642 out_nelts
= in_nelts
* 2;
1643 gcc_assert (known_eq (in_nelts
, VECTOR_CST_NELTS (arg2
))
1644 && known_eq (out_nelts
, TYPE_VECTOR_SUBPARTS (type
)));
1646 tree_vector_builder
elts (type
, out_nelts
, 1);
1647 for (i
= 0; i
< out_nelts
; i
++)
1649 tree elt
= (i
< in_nelts
1650 ? VECTOR_CST_ELT (arg1
, i
)
1651 : VECTOR_CST_ELT (arg2
, i
- in_nelts
));
1652 elt
= fold_convert_const (code
== VEC_PACK_TRUNC_EXPR
1654 : code
== VEC_PACK_FLOAT_EXPR
1655 ? FLOAT_EXPR
: FIX_TRUNC_EXPR
,
1656 TREE_TYPE (type
), elt
);
1657 if (elt
== NULL_TREE
|| !CONSTANT_CLASS_P (elt
))
1659 elts
.quick_push (elt
);
1662 return elts
.build ();
1665 case VEC_WIDEN_MULT_LO_EXPR
:
1666 case VEC_WIDEN_MULT_HI_EXPR
:
1667 case VEC_WIDEN_MULT_EVEN_EXPR
:
1668 case VEC_WIDEN_MULT_ODD_EXPR
:
1670 unsigned HOST_WIDE_INT out_nelts
, in_nelts
, out
, ofs
, scale
;
1672 if (TREE_CODE (arg1
) != VECTOR_CST
|| TREE_CODE (arg2
) != VECTOR_CST
)
1675 if (!VECTOR_CST_NELTS (arg1
).is_constant (&in_nelts
))
1677 out_nelts
= in_nelts
/ 2;
1678 gcc_assert (known_eq (in_nelts
, VECTOR_CST_NELTS (arg2
))
1679 && known_eq (out_nelts
, TYPE_VECTOR_SUBPARTS (type
)));
1681 if (code
== VEC_WIDEN_MULT_LO_EXPR
)
1682 scale
= 0, ofs
= BYTES_BIG_ENDIAN
? out_nelts
: 0;
1683 else if (code
== VEC_WIDEN_MULT_HI_EXPR
)
1684 scale
= 0, ofs
= BYTES_BIG_ENDIAN
? 0 : out_nelts
;
1685 else if (code
== VEC_WIDEN_MULT_EVEN_EXPR
)
1687 else /* if (code == VEC_WIDEN_MULT_ODD_EXPR) */
1690 tree_vector_builder
elts (type
, out_nelts
, 1);
1691 for (out
= 0; out
< out_nelts
; out
++)
1693 unsigned int in
= (out
<< scale
) + ofs
;
1694 tree t1
= fold_convert_const (NOP_EXPR
, TREE_TYPE (type
),
1695 VECTOR_CST_ELT (arg1
, in
));
1696 tree t2
= fold_convert_const (NOP_EXPR
, TREE_TYPE (type
),
1697 VECTOR_CST_ELT (arg2
, in
));
1699 if (t1
== NULL_TREE
|| t2
== NULL_TREE
)
1701 tree elt
= const_binop (MULT_EXPR
, t1
, t2
);
1702 if (elt
== NULL_TREE
|| !CONSTANT_CLASS_P (elt
))
1704 elts
.quick_push (elt
);
1707 return elts
.build ();
1713 if (TREE_CODE_CLASS (code
) != tcc_binary
)
1716 /* Make sure type and arg0 have the same saturating flag. */
1717 gcc_checking_assert (TYPE_SATURATING (type
)
1718 == TYPE_SATURATING (TREE_TYPE (arg1
)));
1720 return const_binop (code
, arg1
, arg2
);
1723 /* Compute CODE ARG1 with resulting type TYPE with ARG1 being constant.
1724 Return zero if computing the constants is not possible. */
1727 const_unop (enum tree_code code
, tree type
, tree arg0
)
1729 /* Don't perform the operation, other than NEGATE and ABS, if
1730 flag_signaling_nans is on and the operand is a signaling NaN. */
1731 if (TREE_CODE (arg0
) == REAL_CST
1732 && HONOR_SNANS (TYPE_MODE (TREE_TYPE (arg0
)))
1733 && REAL_VALUE_ISSIGNALING_NAN (TREE_REAL_CST (arg0
))
1734 && code
!= NEGATE_EXPR
1736 && code
!= ABSU_EXPR
)
1743 case FIX_TRUNC_EXPR
:
1744 case FIXED_CONVERT_EXPR
:
1745 return fold_convert_const (code
, type
, arg0
);
1747 case ADDR_SPACE_CONVERT_EXPR
:
1748 /* If the source address is 0, and the source address space
1749 cannot have a valid object at 0, fold to dest type null. */
1750 if (integer_zerop (arg0
)
1751 && !(targetm
.addr_space
.zero_address_valid
1752 (TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (arg0
))))))
1753 return fold_convert_const (code
, type
, arg0
);
1756 case VIEW_CONVERT_EXPR
:
1757 return fold_view_convert_expr (type
, arg0
);
1761 /* Can't call fold_negate_const directly here as that doesn't
1762 handle all cases and we might not be able to negate some
1764 tree tem
= fold_negate_expr (UNKNOWN_LOCATION
, arg0
);
1765 if (tem
&& CONSTANT_CLASS_P (tem
))
1772 if (TREE_CODE (arg0
) == INTEGER_CST
|| TREE_CODE (arg0
) == REAL_CST
)
1773 return fold_abs_const (arg0
, type
);
1777 if (TREE_CODE (arg0
) == COMPLEX_CST
)
1779 tree ipart
= fold_negate_const (TREE_IMAGPART (arg0
),
1781 return build_complex (type
, TREE_REALPART (arg0
), ipart
);
1786 if (TREE_CODE (arg0
) == INTEGER_CST
)
1787 return fold_not_const (arg0
, type
);
1788 else if (POLY_INT_CST_P (arg0
))
1789 return wide_int_to_tree (type
, -poly_int_cst_value (arg0
));
1790 /* Perform BIT_NOT_EXPR on each element individually. */
1791 else if (TREE_CODE (arg0
) == VECTOR_CST
)
1795 /* This can cope with stepped encodings because ~x == -1 - x. */
1796 tree_vector_builder elements
;
1797 elements
.new_unary_operation (type
, arg0
, true);
1798 unsigned int i
, count
= elements
.encoded_nelts ();
1799 for (i
= 0; i
< count
; ++i
)
1801 elem
= VECTOR_CST_ELT (arg0
, i
);
1802 elem
= const_unop (BIT_NOT_EXPR
, TREE_TYPE (type
), elem
);
1803 if (elem
== NULL_TREE
)
1805 elements
.quick_push (elem
);
1808 return elements
.build ();
1812 case TRUTH_NOT_EXPR
:
1813 if (TREE_CODE (arg0
) == INTEGER_CST
)
1814 return constant_boolean_node (integer_zerop (arg0
), type
);
1818 if (TREE_CODE (arg0
) == COMPLEX_CST
)
1819 return fold_convert (type
, TREE_REALPART (arg0
));
1823 if (TREE_CODE (arg0
) == COMPLEX_CST
)
1824 return fold_convert (type
, TREE_IMAGPART (arg0
));
1827 case VEC_UNPACK_LO_EXPR
:
1828 case VEC_UNPACK_HI_EXPR
:
1829 case VEC_UNPACK_FLOAT_LO_EXPR
:
1830 case VEC_UNPACK_FLOAT_HI_EXPR
:
1831 case VEC_UNPACK_FIX_TRUNC_LO_EXPR
:
1832 case VEC_UNPACK_FIX_TRUNC_HI_EXPR
:
1834 unsigned HOST_WIDE_INT out_nelts
, in_nelts
, i
;
1835 enum tree_code subcode
;
1837 if (TREE_CODE (arg0
) != VECTOR_CST
)
1840 if (!VECTOR_CST_NELTS (arg0
).is_constant (&in_nelts
))
1842 out_nelts
= in_nelts
/ 2;
1843 gcc_assert (known_eq (out_nelts
, TYPE_VECTOR_SUBPARTS (type
)));
1845 unsigned int offset
= 0;
1846 if ((!BYTES_BIG_ENDIAN
) ^ (code
== VEC_UNPACK_LO_EXPR
1847 || code
== VEC_UNPACK_FLOAT_LO_EXPR
1848 || code
== VEC_UNPACK_FIX_TRUNC_LO_EXPR
))
1851 if (code
== VEC_UNPACK_LO_EXPR
|| code
== VEC_UNPACK_HI_EXPR
)
1853 else if (code
== VEC_UNPACK_FLOAT_LO_EXPR
1854 || code
== VEC_UNPACK_FLOAT_HI_EXPR
)
1855 subcode
= FLOAT_EXPR
;
1857 subcode
= FIX_TRUNC_EXPR
;
1859 tree_vector_builder
elts (type
, out_nelts
, 1);
1860 for (i
= 0; i
< out_nelts
; i
++)
1862 tree elt
= fold_convert_const (subcode
, TREE_TYPE (type
),
1863 VECTOR_CST_ELT (arg0
, i
+ offset
));
1864 if (elt
== NULL_TREE
|| !CONSTANT_CLASS_P (elt
))
1866 elts
.quick_push (elt
);
1869 return elts
.build ();
1872 case VEC_DUPLICATE_EXPR
:
1873 if (CONSTANT_CLASS_P (arg0
))
1874 return build_vector_from_val (type
, arg0
);
1884 /* Create a sizetype INT_CST node with NUMBER sign extended. KIND
1885 indicates which particular sizetype to create. */
1888 size_int_kind (poly_int64 number
, enum size_type_kind kind
)
1890 return build_int_cst (sizetype_tab
[(int) kind
], number
);
1893 /* Combine operands OP1 and OP2 with arithmetic operation CODE. CODE
1894 is a tree code. The type of the result is taken from the operands.
1895 Both must be equivalent integer types, ala int_binop_types_match_p.
1896 If the operands are constant, so is the result. */
1899 size_binop_loc (location_t loc
, enum tree_code code
, tree arg0
, tree arg1
)
1901 tree type
= TREE_TYPE (arg0
);
1903 if (arg0
== error_mark_node
|| arg1
== error_mark_node
)
1904 return error_mark_node
;
1906 gcc_assert (int_binop_types_match_p (code
, TREE_TYPE (arg0
),
1909 /* Handle the special case of two poly_int constants faster. */
1910 if (poly_int_tree_p (arg0
) && poly_int_tree_p (arg1
))
1912 /* And some specific cases even faster than that. */
1913 if (code
== PLUS_EXPR
)
1915 if (integer_zerop (arg0
)
1916 && !TREE_OVERFLOW (tree_strip_any_location_wrapper (arg0
)))
1918 if (integer_zerop (arg1
)
1919 && !TREE_OVERFLOW (tree_strip_any_location_wrapper (arg1
)))
1922 else if (code
== MINUS_EXPR
)
1924 if (integer_zerop (arg1
)
1925 && !TREE_OVERFLOW (tree_strip_any_location_wrapper (arg1
)))
1928 else if (code
== MULT_EXPR
)
1930 if (integer_onep (arg0
)
1931 && !TREE_OVERFLOW (tree_strip_any_location_wrapper (arg0
)))
1935 /* Handle general case of two integer constants. For sizetype
1936 constant calculations we always want to know about overflow,
1937 even in the unsigned case. */
1938 tree res
= int_const_binop (code
, arg0
, arg1
, -1);
1939 if (res
!= NULL_TREE
)
1943 return fold_build2_loc (loc
, code
, type
, arg0
, arg1
);
1946 /* Given two values, either both of sizetype or both of bitsizetype,
1947 compute the difference between the two values. Return the value
1948 in signed type corresponding to the type of the operands. */
1951 size_diffop_loc (location_t loc
, tree arg0
, tree arg1
)
1953 tree type
= TREE_TYPE (arg0
);
1956 gcc_assert (int_binop_types_match_p (MINUS_EXPR
, TREE_TYPE (arg0
),
1959 /* If the type is already signed, just do the simple thing. */
1960 if (!TYPE_UNSIGNED (type
))
1961 return size_binop_loc (loc
, MINUS_EXPR
, arg0
, arg1
);
1963 if (type
== sizetype
)
1965 else if (type
== bitsizetype
)
1966 ctype
= sbitsizetype
;
1968 ctype
= signed_type_for (type
);
1970 /* If either operand is not a constant, do the conversions to the signed
1971 type and subtract. The hardware will do the right thing with any
1972 overflow in the subtraction. */
1973 if (TREE_CODE (arg0
) != INTEGER_CST
|| TREE_CODE (arg1
) != INTEGER_CST
)
1974 return size_binop_loc (loc
, MINUS_EXPR
,
1975 fold_convert_loc (loc
, ctype
, arg0
),
1976 fold_convert_loc (loc
, ctype
, arg1
));
1978 /* If ARG0 is larger than ARG1, subtract and return the result in CTYPE.
1979 Otherwise, subtract the other way, convert to CTYPE (we know that can't
1980 overflow) and negate (which can't either). Special-case a result
1981 of zero while we're here. */
1982 if (tree_int_cst_equal (arg0
, arg1
))
1983 return build_int_cst (ctype
, 0);
1984 else if (tree_int_cst_lt (arg1
, arg0
))
1985 return fold_convert_loc (loc
, ctype
,
1986 size_binop_loc (loc
, MINUS_EXPR
, arg0
, arg1
));
1988 return size_binop_loc (loc
, MINUS_EXPR
, build_int_cst (ctype
, 0),
1989 fold_convert_loc (loc
, ctype
,
1990 size_binop_loc (loc
,
1995 /* A subroutine of fold_convert_const handling conversions of an
1996 INTEGER_CST to another integer type. */
1999 fold_convert_const_int_from_int (tree type
, const_tree arg1
)
2001 /* Given an integer constant, make new constant with new type,
2002 appropriately sign-extended or truncated. Use widest_int
2003 so that any extension is done according ARG1's type. */
2004 return force_fit_type (type
, wi::to_widest (arg1
),
2005 !POINTER_TYPE_P (TREE_TYPE (arg1
)),
2006 TREE_OVERFLOW (arg1
));
2009 /* A subroutine of fold_convert_const handling conversions a REAL_CST
2010 to an integer type. */
2013 fold_convert_const_int_from_real (enum tree_code code
, tree type
, const_tree arg1
)
2015 bool overflow
= false;
2018 /* The following code implements the floating point to integer
2019 conversion rules required by the Java Language Specification,
2020 that IEEE NaNs are mapped to zero and values that overflow
2021 the target precision saturate, i.e. values greater than
2022 INT_MAX are mapped to INT_MAX, and values less than INT_MIN
2023 are mapped to INT_MIN. These semantics are allowed by the
2024 C and C++ standards that simply state that the behavior of
2025 FP-to-integer conversion is unspecified upon overflow. */
2029 REAL_VALUE_TYPE x
= TREE_REAL_CST (arg1
);
2033 case FIX_TRUNC_EXPR
:
2034 real_trunc (&r
, VOIDmode
, &x
);
2041 /* If R is NaN, return zero and show we have an overflow. */
2042 if (REAL_VALUE_ISNAN (r
))
2045 val
= wi::zero (TYPE_PRECISION (type
));
2048 /* See if R is less than the lower bound or greater than the
2053 tree lt
= TYPE_MIN_VALUE (type
);
2054 REAL_VALUE_TYPE l
= real_value_from_int_cst (NULL_TREE
, lt
);
2055 if (real_less (&r
, &l
))
2058 val
= wi::to_wide (lt
);
2064 tree ut
= TYPE_MAX_VALUE (type
);
2067 REAL_VALUE_TYPE u
= real_value_from_int_cst (NULL_TREE
, ut
);
2068 if (real_less (&u
, &r
))
2071 val
= wi::to_wide (ut
);
2077 val
= real_to_integer (&r
, &overflow
, TYPE_PRECISION (type
));
2079 t
= force_fit_type (type
, val
, -1, overflow
| TREE_OVERFLOW (arg1
));
2083 /* A subroutine of fold_convert_const handling conversions of a
2084 FIXED_CST to an integer type. */
2087 fold_convert_const_int_from_fixed (tree type
, const_tree arg1
)
2090 double_int temp
, temp_trunc
;
2093 /* Right shift FIXED_CST to temp by fbit. */
2094 temp
= TREE_FIXED_CST (arg1
).data
;
2095 mode
= TREE_FIXED_CST (arg1
).mode
;
2096 if (GET_MODE_FBIT (mode
) < HOST_BITS_PER_DOUBLE_INT
)
2098 temp
= temp
.rshift (GET_MODE_FBIT (mode
),
2099 HOST_BITS_PER_DOUBLE_INT
,
2100 SIGNED_FIXED_POINT_MODE_P (mode
));
2102 /* Left shift temp to temp_trunc by fbit. */
2103 temp_trunc
= temp
.lshift (GET_MODE_FBIT (mode
),
2104 HOST_BITS_PER_DOUBLE_INT
,
2105 SIGNED_FIXED_POINT_MODE_P (mode
));
2109 temp
= double_int_zero
;
2110 temp_trunc
= double_int_zero
;
2113 /* If FIXED_CST is negative, we need to round the value toward 0.
2114 By checking if the fractional bits are not zero to add 1 to temp. */
2115 if (SIGNED_FIXED_POINT_MODE_P (mode
)
2116 && temp_trunc
.is_negative ()
2117 && TREE_FIXED_CST (arg1
).data
!= temp_trunc
)
2118 temp
+= double_int_one
;
2120 /* Given a fixed-point constant, make new constant with new type,
2121 appropriately sign-extended or truncated. */
2122 t
= force_fit_type (type
, temp
, -1,
2123 (temp
.is_negative ()
2124 && (TYPE_UNSIGNED (type
)
2125 < TYPE_UNSIGNED (TREE_TYPE (arg1
))))
2126 | TREE_OVERFLOW (arg1
));
2131 /* A subroutine of fold_convert_const handling conversions a REAL_CST
2132 to another floating point type. */
2135 fold_convert_const_real_from_real (tree type
, const_tree arg1
)
2137 REAL_VALUE_TYPE value
;
2140 /* Don't perform the operation if flag_signaling_nans is on
2141 and the operand is a signaling NaN. */
2142 if (HONOR_SNANS (TYPE_MODE (TREE_TYPE (arg1
)))
2143 && REAL_VALUE_ISSIGNALING_NAN (TREE_REAL_CST (arg1
)))
2146 real_convert (&value
, TYPE_MODE (type
), &TREE_REAL_CST (arg1
));
2147 t
= build_real (type
, value
);
2149 /* If converting an infinity or NAN to a representation that doesn't
2150 have one, set the overflow bit so that we can produce some kind of
2151 error message at the appropriate point if necessary. It's not the
2152 most user-friendly message, but it's better than nothing. */
2153 if (REAL_VALUE_ISINF (TREE_REAL_CST (arg1
))
2154 && !MODE_HAS_INFINITIES (TYPE_MODE (type
)))
2155 TREE_OVERFLOW (t
) = 1;
2156 else if (REAL_VALUE_ISNAN (TREE_REAL_CST (arg1
))
2157 && !MODE_HAS_NANS (TYPE_MODE (type
)))
2158 TREE_OVERFLOW (t
) = 1;
2159 /* Regular overflow, conversion produced an infinity in a mode that
2160 can't represent them. */
2161 else if (!MODE_HAS_INFINITIES (TYPE_MODE (type
))
2162 && REAL_VALUE_ISINF (value
)
2163 && !REAL_VALUE_ISINF (TREE_REAL_CST (arg1
)))
2164 TREE_OVERFLOW (t
) = 1;
2166 TREE_OVERFLOW (t
) = TREE_OVERFLOW (arg1
);
2170 /* A subroutine of fold_convert_const handling conversions a FIXED_CST
2171 to a floating point type. */
2174 fold_convert_const_real_from_fixed (tree type
, const_tree arg1
)
2176 REAL_VALUE_TYPE value
;
2179 real_convert_from_fixed (&value
, SCALAR_FLOAT_TYPE_MODE (type
),
2180 &TREE_FIXED_CST (arg1
));
2181 t
= build_real (type
, value
);
2183 TREE_OVERFLOW (t
) = TREE_OVERFLOW (arg1
);
2187 /* A subroutine of fold_convert_const handling conversions a FIXED_CST
2188 to another fixed-point type. */
2191 fold_convert_const_fixed_from_fixed (tree type
, const_tree arg1
)
2193 FIXED_VALUE_TYPE value
;
2197 overflow_p
= fixed_convert (&value
, SCALAR_TYPE_MODE (type
),
2198 &TREE_FIXED_CST (arg1
), TYPE_SATURATING (type
));
2199 t
= build_fixed (type
, value
);
2201 /* Propagate overflow flags. */
2202 if (overflow_p
| TREE_OVERFLOW (arg1
))
2203 TREE_OVERFLOW (t
) = 1;
2207 /* A subroutine of fold_convert_const handling conversions an INTEGER_CST
2208 to a fixed-point type. */
2211 fold_convert_const_fixed_from_int (tree type
, const_tree arg1
)
2213 FIXED_VALUE_TYPE value
;
2218 gcc_assert (TREE_INT_CST_NUNITS (arg1
) <= 2);
2220 di
.low
= TREE_INT_CST_ELT (arg1
, 0);
2221 if (TREE_INT_CST_NUNITS (arg1
) == 1)
2222 di
.high
= (HOST_WIDE_INT
) di
.low
< 0 ? HOST_WIDE_INT_M1
: 0;
2224 di
.high
= TREE_INT_CST_ELT (arg1
, 1);
2226 overflow_p
= fixed_convert_from_int (&value
, SCALAR_TYPE_MODE (type
), di
,
2227 TYPE_UNSIGNED (TREE_TYPE (arg1
)),
2228 TYPE_SATURATING (type
));
2229 t
= build_fixed (type
, value
);
2231 /* Propagate overflow flags. */
2232 if (overflow_p
| TREE_OVERFLOW (arg1
))
2233 TREE_OVERFLOW (t
) = 1;
2237 /* A subroutine of fold_convert_const handling conversions a REAL_CST
2238 to a fixed-point type. */
2241 fold_convert_const_fixed_from_real (tree type
, const_tree arg1
)
2243 FIXED_VALUE_TYPE value
;
2247 overflow_p
= fixed_convert_from_real (&value
, SCALAR_TYPE_MODE (type
),
2248 &TREE_REAL_CST (arg1
),
2249 TYPE_SATURATING (type
));
2250 t
= build_fixed (type
, value
);
2252 /* Propagate overflow flags. */
2253 if (overflow_p
| TREE_OVERFLOW (arg1
))
2254 TREE_OVERFLOW (t
) = 1;
2258 /* Attempt to fold type conversion operation CODE of expression ARG1 to
2259 type TYPE. If no simplification can be done return NULL_TREE. */
2262 fold_convert_const (enum tree_code code
, tree type
, tree arg1
)
2264 tree arg_type
= TREE_TYPE (arg1
);
2265 if (arg_type
== type
)
2268 /* We can't widen types, since the runtime value could overflow the
2269 original type before being extended to the new type. */
2270 if (POLY_INT_CST_P (arg1
)
2271 && (POINTER_TYPE_P (type
) || INTEGRAL_TYPE_P (type
))
2272 && TYPE_PRECISION (type
) <= TYPE_PRECISION (arg_type
))
2273 return build_poly_int_cst (type
,
2274 poly_wide_int::from (poly_int_cst_value (arg1
),
2275 TYPE_PRECISION (type
),
2276 TYPE_SIGN (arg_type
)));
2278 if (POINTER_TYPE_P (type
) || INTEGRAL_TYPE_P (type
)
2279 || TREE_CODE (type
) == OFFSET_TYPE
)
2281 if (TREE_CODE (arg1
) == INTEGER_CST
)
2282 return fold_convert_const_int_from_int (type
, arg1
);
2283 else if (TREE_CODE (arg1
) == REAL_CST
)
2284 return fold_convert_const_int_from_real (code
, type
, arg1
);
2285 else if (TREE_CODE (arg1
) == FIXED_CST
)
2286 return fold_convert_const_int_from_fixed (type
, arg1
);
2288 else if (TREE_CODE (type
) == REAL_TYPE
)
2290 if (TREE_CODE (arg1
) == INTEGER_CST
)
2291 return build_real_from_int_cst (type
, arg1
);
2292 else if (TREE_CODE (arg1
) == REAL_CST
)
2293 return fold_convert_const_real_from_real (type
, arg1
);
2294 else if (TREE_CODE (arg1
) == FIXED_CST
)
2295 return fold_convert_const_real_from_fixed (type
, arg1
);
2297 else if (TREE_CODE (type
) == FIXED_POINT_TYPE
)
2299 if (TREE_CODE (arg1
) == FIXED_CST
)
2300 return fold_convert_const_fixed_from_fixed (type
, arg1
);
2301 else if (TREE_CODE (arg1
) == INTEGER_CST
)
2302 return fold_convert_const_fixed_from_int (type
, arg1
);
2303 else if (TREE_CODE (arg1
) == REAL_CST
)
2304 return fold_convert_const_fixed_from_real (type
, arg1
);
2306 else if (TREE_CODE (type
) == VECTOR_TYPE
)
2308 if (TREE_CODE (arg1
) == VECTOR_CST
2309 && known_eq (TYPE_VECTOR_SUBPARTS (type
), VECTOR_CST_NELTS (arg1
)))
2311 tree elttype
= TREE_TYPE (type
);
2312 tree arg1_elttype
= TREE_TYPE (TREE_TYPE (arg1
));
2313 /* We can't handle steps directly when extending, since the
2314 values need to wrap at the original precision first. */
2316 = (INTEGRAL_TYPE_P (elttype
)
2317 && INTEGRAL_TYPE_P (arg1_elttype
)
2318 && TYPE_PRECISION (elttype
) <= TYPE_PRECISION (arg1_elttype
));
2319 tree_vector_builder v
;
2320 if (!v
.new_unary_operation (type
, arg1
, step_ok_p
))
2322 unsigned int len
= v
.encoded_nelts ();
2323 for (unsigned int i
= 0; i
< len
; ++i
)
2325 tree elt
= VECTOR_CST_ELT (arg1
, i
);
2326 tree cvt
= fold_convert_const (code
, elttype
, elt
);
2327 if (cvt
== NULL_TREE
)
2337 /* Construct a vector of zero elements of vector type TYPE. */
2340 build_zero_vector (tree type
)
2344 t
= fold_convert_const (NOP_EXPR
, TREE_TYPE (type
), integer_zero_node
);
2345 return build_vector_from_val (type
, t
);
2348 /* Returns true, if ARG is convertible to TYPE using a NOP_EXPR. */
2351 fold_convertible_p (const_tree type
, const_tree arg
)
2353 tree orig
= TREE_TYPE (arg
);
2358 if (TREE_CODE (arg
) == ERROR_MARK
2359 || TREE_CODE (type
) == ERROR_MARK
2360 || TREE_CODE (orig
) == ERROR_MARK
)
2363 if (TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (orig
))
2366 switch (TREE_CODE (type
))
2368 case INTEGER_TYPE
: case ENUMERAL_TYPE
: case BOOLEAN_TYPE
:
2369 case POINTER_TYPE
: case REFERENCE_TYPE
:
2371 return (INTEGRAL_TYPE_P (orig
)
2372 || (POINTER_TYPE_P (orig
)
2373 && TYPE_PRECISION (type
) <= TYPE_PRECISION (orig
))
2374 || TREE_CODE (orig
) == OFFSET_TYPE
);
2377 case FIXED_POINT_TYPE
:
2379 return TREE_CODE (type
) == TREE_CODE (orig
);
2382 return (VECTOR_TYPE_P (orig
)
2383 && known_eq (TYPE_VECTOR_SUBPARTS (type
),
2384 TYPE_VECTOR_SUBPARTS (orig
))
2385 && fold_convertible_p (TREE_TYPE (type
), TREE_TYPE (orig
)));
2392 /* Convert expression ARG to type TYPE. Used by the middle-end for
2393 simple conversions in preference to calling the front-end's convert. */
2396 fold_convert_loc (location_t loc
, tree type
, tree arg
)
2398 tree orig
= TREE_TYPE (arg
);
2404 if (TREE_CODE (arg
) == ERROR_MARK
2405 || TREE_CODE (type
) == ERROR_MARK
2406 || TREE_CODE (orig
) == ERROR_MARK
)
2407 return error_mark_node
;
2409 switch (TREE_CODE (type
))
2412 case REFERENCE_TYPE
:
2413 /* Handle conversions between pointers to different address spaces. */
2414 if (POINTER_TYPE_P (orig
)
2415 && (TYPE_ADDR_SPACE (TREE_TYPE (type
))
2416 != TYPE_ADDR_SPACE (TREE_TYPE (orig
))))
2417 return fold_build1_loc (loc
, ADDR_SPACE_CONVERT_EXPR
, type
, arg
);
2420 case INTEGER_TYPE
: case ENUMERAL_TYPE
: case BOOLEAN_TYPE
:
2422 if (TREE_CODE (arg
) == INTEGER_CST
)
2424 tem
= fold_convert_const (NOP_EXPR
, type
, arg
);
2425 if (tem
!= NULL_TREE
)
2428 if (INTEGRAL_TYPE_P (orig
) || POINTER_TYPE_P (orig
)
2429 || TREE_CODE (orig
) == OFFSET_TYPE
)
2430 return fold_build1_loc (loc
, NOP_EXPR
, type
, arg
);
2431 if (TREE_CODE (orig
) == COMPLEX_TYPE
)
2432 return fold_convert_loc (loc
, type
,
2433 fold_build1_loc (loc
, REALPART_EXPR
,
2434 TREE_TYPE (orig
), arg
));
2435 gcc_assert (TREE_CODE (orig
) == VECTOR_TYPE
2436 && tree_int_cst_equal (TYPE_SIZE (type
), TYPE_SIZE (orig
)));
2437 return fold_build1_loc (loc
, VIEW_CONVERT_EXPR
, type
, arg
);
2440 if (TREE_CODE (arg
) == INTEGER_CST
)
2442 tem
= fold_convert_const (FLOAT_EXPR
, type
, arg
);
2443 if (tem
!= NULL_TREE
)
2446 else if (TREE_CODE (arg
) == REAL_CST
)
2448 tem
= fold_convert_const (NOP_EXPR
, type
, arg
);
2449 if (tem
!= NULL_TREE
)
2452 else if (TREE_CODE (arg
) == FIXED_CST
)
2454 tem
= fold_convert_const (FIXED_CONVERT_EXPR
, type
, arg
);
2455 if (tem
!= NULL_TREE
)
2459 switch (TREE_CODE (orig
))
2462 case BOOLEAN_TYPE
: case ENUMERAL_TYPE
:
2463 case POINTER_TYPE
: case REFERENCE_TYPE
:
2464 return fold_build1_loc (loc
, FLOAT_EXPR
, type
, arg
);
2467 return fold_build1_loc (loc
, NOP_EXPR
, type
, arg
);
2469 case FIXED_POINT_TYPE
:
2470 return fold_build1_loc (loc
, FIXED_CONVERT_EXPR
, type
, arg
);
2473 tem
= fold_build1_loc (loc
, REALPART_EXPR
, TREE_TYPE (orig
), arg
);
2474 return fold_convert_loc (loc
, type
, tem
);
2480 case FIXED_POINT_TYPE
:
2481 if (TREE_CODE (arg
) == FIXED_CST
|| TREE_CODE (arg
) == INTEGER_CST
2482 || TREE_CODE (arg
) == REAL_CST
)
2484 tem
= fold_convert_const (FIXED_CONVERT_EXPR
, type
, arg
);
2485 if (tem
!= NULL_TREE
)
2486 goto fold_convert_exit
;
2489 switch (TREE_CODE (orig
))
2491 case FIXED_POINT_TYPE
:
2496 return fold_build1_loc (loc
, FIXED_CONVERT_EXPR
, type
, arg
);
2499 tem
= fold_build1_loc (loc
, REALPART_EXPR
, TREE_TYPE (orig
), arg
);
2500 return fold_convert_loc (loc
, type
, tem
);
2507 switch (TREE_CODE (orig
))
2510 case BOOLEAN_TYPE
: case ENUMERAL_TYPE
:
2511 case POINTER_TYPE
: case REFERENCE_TYPE
:
2513 case FIXED_POINT_TYPE
:
2514 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
,
2515 fold_convert_loc (loc
, TREE_TYPE (type
), arg
),
2516 fold_convert_loc (loc
, TREE_TYPE (type
),
2517 integer_zero_node
));
2522 if (TREE_CODE (arg
) == COMPLEX_EXPR
)
2524 rpart
= fold_convert_loc (loc
, TREE_TYPE (type
),
2525 TREE_OPERAND (arg
, 0));
2526 ipart
= fold_convert_loc (loc
, TREE_TYPE (type
),
2527 TREE_OPERAND (arg
, 1));
2528 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
, rpart
, ipart
);
2531 arg
= save_expr (arg
);
2532 rpart
= fold_build1_loc (loc
, REALPART_EXPR
, TREE_TYPE (orig
), arg
);
2533 ipart
= fold_build1_loc (loc
, IMAGPART_EXPR
, TREE_TYPE (orig
), arg
);
2534 rpart
= fold_convert_loc (loc
, TREE_TYPE (type
), rpart
);
2535 ipart
= fold_convert_loc (loc
, TREE_TYPE (type
), ipart
);
2536 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
, rpart
, ipart
);
2544 if (integer_zerop (arg
))
2545 return build_zero_vector (type
);
2546 gcc_assert (tree_int_cst_equal (TYPE_SIZE (type
), TYPE_SIZE (orig
)));
2547 gcc_assert (INTEGRAL_TYPE_P (orig
) || POINTER_TYPE_P (orig
)
2548 || TREE_CODE (orig
) == VECTOR_TYPE
);
2549 return fold_build1_loc (loc
, VIEW_CONVERT_EXPR
, type
, arg
);
2552 tem
= fold_ignored_result (arg
);
2553 return fold_build1_loc (loc
, NOP_EXPR
, type
, tem
);
2556 if (TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (orig
))
2557 return fold_build1_loc (loc
, NOP_EXPR
, type
, arg
);
2561 protected_set_expr_location_unshare (tem
, loc
);
2565 /* Return false if expr can be assumed not to be an lvalue, true
2569 maybe_lvalue_p (const_tree x
)
2571 /* We only need to wrap lvalue tree codes. */
2572 switch (TREE_CODE (x
))
2585 case ARRAY_RANGE_REF
:
2591 case PREINCREMENT_EXPR
:
2592 case PREDECREMENT_EXPR
:
2594 case TRY_CATCH_EXPR
:
2595 case WITH_CLEANUP_EXPR
:
2601 case VIEW_CONVERT_EXPR
:
2605 /* Assume the worst for front-end tree codes. */
2606 if ((int)TREE_CODE (x
) >= NUM_TREE_CODES
)
2614 /* Return an expr equal to X but certainly not valid as an lvalue. */
2617 non_lvalue_loc (location_t loc
, tree x
)
2619 /* While we are in GIMPLE, NON_LVALUE_EXPR doesn't mean anything to
2624 if (! maybe_lvalue_p (x
))
2626 return build1_loc (loc
, NON_LVALUE_EXPR
, TREE_TYPE (x
), x
);
2629 /* When pedantic, return an expr equal to X but certainly not valid as a
2630 pedantic lvalue. Otherwise, return X. */
2633 pedantic_non_lvalue_loc (location_t loc
, tree x
)
2635 return protected_set_expr_location_unshare (x
, loc
);
2638 /* Given a tree comparison code, return the code that is the logical inverse.
2639 It is generally not safe to do this for floating-point comparisons, except
2640 for EQ_EXPR, NE_EXPR, ORDERED_EXPR and UNORDERED_EXPR, so we return
2641 ERROR_MARK in this case. */
2644 invert_tree_comparison (enum tree_code code
, bool honor_nans
)
2646 if (honor_nans
&& flag_trapping_math
&& code
!= EQ_EXPR
&& code
!= NE_EXPR
2647 && code
!= ORDERED_EXPR
&& code
!= UNORDERED_EXPR
)
2657 return honor_nans
? UNLE_EXPR
: LE_EXPR
;
2659 return honor_nans
? UNLT_EXPR
: LT_EXPR
;
2661 return honor_nans
? UNGE_EXPR
: GE_EXPR
;
2663 return honor_nans
? UNGT_EXPR
: GT_EXPR
;
2677 return UNORDERED_EXPR
;
2678 case UNORDERED_EXPR
:
2679 return ORDERED_EXPR
;
2685 /* Similar, but return the comparison that results if the operands are
2686 swapped. This is safe for floating-point. */
2689 swap_tree_comparison (enum tree_code code
)
2696 case UNORDERED_EXPR
:
2722 /* Convert a comparison tree code from an enum tree_code representation
2723 into a compcode bit-based encoding. This function is the inverse of
2724 compcode_to_comparison. */
2726 static enum comparison_code
2727 comparison_to_compcode (enum tree_code code
)
2744 return COMPCODE_ORD
;
2745 case UNORDERED_EXPR
:
2746 return COMPCODE_UNORD
;
2748 return COMPCODE_UNLT
;
2750 return COMPCODE_UNEQ
;
2752 return COMPCODE_UNLE
;
2754 return COMPCODE_UNGT
;
2756 return COMPCODE_LTGT
;
2758 return COMPCODE_UNGE
;
2764 /* Convert a compcode bit-based encoding of a comparison operator back
2765 to GCC's enum tree_code representation. This function is the
2766 inverse of comparison_to_compcode. */
2768 static enum tree_code
2769 compcode_to_comparison (enum comparison_code code
)
2786 return ORDERED_EXPR
;
2787 case COMPCODE_UNORD
:
2788 return UNORDERED_EXPR
;
2806 /* Return true if COND1 tests the opposite condition of COND2. */
2809 inverse_conditions_p (const_tree cond1
, const_tree cond2
)
2811 return (COMPARISON_CLASS_P (cond1
)
2812 && COMPARISON_CLASS_P (cond2
)
2813 && (invert_tree_comparison
2815 HONOR_NANS (TREE_OPERAND (cond1
, 0))) == TREE_CODE (cond2
))
2816 && operand_equal_p (TREE_OPERAND (cond1
, 0),
2817 TREE_OPERAND (cond2
, 0), 0)
2818 && operand_equal_p (TREE_OPERAND (cond1
, 1),
2819 TREE_OPERAND (cond2
, 1), 0));
2822 /* Return a tree for the comparison which is the combination of
2823 doing the AND or OR (depending on CODE) of the two operations LCODE
2824 and RCODE on the identical operands LL_ARG and LR_ARG. Take into account
2825 the possibility of trapping if the mode has NaNs, and return NULL_TREE
2826 if this makes the transformation invalid. */
2829 combine_comparisons (location_t loc
,
2830 enum tree_code code
, enum tree_code lcode
,
2831 enum tree_code rcode
, tree truth_type
,
2832 tree ll_arg
, tree lr_arg
)
2834 bool honor_nans
= HONOR_NANS (ll_arg
);
2835 enum comparison_code lcompcode
= comparison_to_compcode (lcode
);
2836 enum comparison_code rcompcode
= comparison_to_compcode (rcode
);
2841 case TRUTH_AND_EXPR
: case TRUTH_ANDIF_EXPR
:
2842 compcode
= lcompcode
& rcompcode
;
2845 case TRUTH_OR_EXPR
: case TRUTH_ORIF_EXPR
:
2846 compcode
= lcompcode
| rcompcode
;
2855 /* Eliminate unordered comparisons, as well as LTGT and ORD
2856 which are not used unless the mode has NaNs. */
2857 compcode
&= ~COMPCODE_UNORD
;
2858 if (compcode
== COMPCODE_LTGT
)
2859 compcode
= COMPCODE_NE
;
2860 else if (compcode
== COMPCODE_ORD
)
2861 compcode
= COMPCODE_TRUE
;
2863 else if (flag_trapping_math
)
2865 /* Check that the original operation and the optimized ones will trap
2866 under the same condition. */
2867 bool ltrap
= (lcompcode
& COMPCODE_UNORD
) == 0
2868 && (lcompcode
!= COMPCODE_EQ
)
2869 && (lcompcode
!= COMPCODE_ORD
);
2870 bool rtrap
= (rcompcode
& COMPCODE_UNORD
) == 0
2871 && (rcompcode
!= COMPCODE_EQ
)
2872 && (rcompcode
!= COMPCODE_ORD
);
2873 bool trap
= (compcode
& COMPCODE_UNORD
) == 0
2874 && (compcode
!= COMPCODE_EQ
)
2875 && (compcode
!= COMPCODE_ORD
);
2877 /* In a short-circuited boolean expression the LHS might be
2878 such that the RHS, if evaluated, will never trap. For
2879 example, in ORD (x, y) && (x < y), we evaluate the RHS only
2880 if neither x nor y is NaN. (This is a mixed blessing: for
2881 example, the expression above will never trap, hence
2882 optimizing it to x < y would be invalid). */
2883 if ((code
== TRUTH_ORIF_EXPR
&& (lcompcode
& COMPCODE_UNORD
))
2884 || (code
== TRUTH_ANDIF_EXPR
&& !(lcompcode
& COMPCODE_UNORD
)))
2887 /* If the comparison was short-circuited, and only the RHS
2888 trapped, we may now generate a spurious trap. */
2890 && (code
== TRUTH_ANDIF_EXPR
|| code
== TRUTH_ORIF_EXPR
))
2893 /* If we changed the conditions that cause a trap, we lose. */
2894 if ((ltrap
|| rtrap
) != trap
)
2898 if (compcode
== COMPCODE_TRUE
)
2899 return constant_boolean_node (true, truth_type
);
2900 else if (compcode
== COMPCODE_FALSE
)
2901 return constant_boolean_node (false, truth_type
);
2904 enum tree_code tcode
;
2906 tcode
= compcode_to_comparison ((enum comparison_code
) compcode
);
2907 return fold_build2_loc (loc
, tcode
, truth_type
, ll_arg
, lr_arg
);
2911 /* Return nonzero if two operands (typically of the same tree node)
2912 are necessarily equal. FLAGS modifies behavior as follows:
2914 If OEP_ONLY_CONST is set, only return nonzero for constants.
2915 This function tests whether the operands are indistinguishable;
2916 it does not test whether they are equal using C's == operation.
2917 The distinction is important for IEEE floating point, because
2918 (1) -0.0 and 0.0 are distinguishable, but -0.0==0.0, and
2919 (2) two NaNs may be indistinguishable, but NaN!=NaN.
2921 If OEP_ONLY_CONST is unset, a VAR_DECL is considered equal to itself
2922 even though it may hold multiple values during a function.
2923 This is because a GCC tree node guarantees that nothing else is
2924 executed between the evaluation of its "operands" (which may often
2925 be evaluated in arbitrary order). Hence if the operands themselves
2926 don't side-effect, the VAR_DECLs, PARM_DECLs etc... must hold the
2927 same value in each operand/subexpression. Hence leaving OEP_ONLY_CONST
2928 unset means assuming isochronic (or instantaneous) tree equivalence.
2929 Unless comparing arbitrary expression trees, such as from different
2930 statements, this flag can usually be left unset.
2932 If OEP_PURE_SAME is set, then pure functions with identical arguments
2933 are considered the same. It is used when the caller has other ways
2934 to ensure that global memory is unchanged in between.
2936 If OEP_ADDRESS_OF is set, we are actually comparing addresses of objects,
2937 not values of expressions.
2939 If OEP_LEXICOGRAPHIC is set, then also handle expressions with side-effects
2940 such as MODIFY_EXPR, RETURN_EXPR, as well as STATEMENT_LISTs.
2942 If OEP_BITWISE is set, then require the values to be bitwise identical
2943 rather than simply numerically equal. Do not take advantage of things
2944 like math-related flags or undefined behavior; only return true for
2945 values that are provably bitwise identical in all circumstances.
2947 Unless OEP_MATCH_SIDE_EFFECTS is set, the function returns false on
2948 any operand with side effect. This is unnecesarily conservative in the
2949 case we know that arg0 and arg1 are in disjoint code paths (such as in
2950 ?: operator). In addition OEP_MATCH_SIDE_EFFECTS is used when comparing
2951 addresses with TREE_CONSTANT flag set so we know that &var == &var
2952 even if var is volatile. */
2955 operand_compare::operand_equal_p (const_tree arg0
, const_tree arg1
,
2959 if (verify_hash_value (arg0
, arg1
, flags
, &r
))
2962 STRIP_ANY_LOCATION_WRAPPER (arg0
);
2963 STRIP_ANY_LOCATION_WRAPPER (arg1
);
2965 /* If either is ERROR_MARK, they aren't equal. */
2966 if (TREE_CODE (arg0
) == ERROR_MARK
|| TREE_CODE (arg1
) == ERROR_MARK
2967 || TREE_TYPE (arg0
) == error_mark_node
2968 || TREE_TYPE (arg1
) == error_mark_node
)
2971 /* Similar, if either does not have a type (like a template id),
2972 they aren't equal. */
2973 if (!TREE_TYPE (arg0
) || !TREE_TYPE (arg1
))
2976 /* Bitwise identity makes no sense if the values have different layouts. */
2977 if ((flags
& OEP_BITWISE
)
2978 && !tree_nop_conversion_p (TREE_TYPE (arg0
), TREE_TYPE (arg1
)))
2981 /* We cannot consider pointers to different address space equal. */
2982 if (POINTER_TYPE_P (TREE_TYPE (arg0
))
2983 && POINTER_TYPE_P (TREE_TYPE (arg1
))
2984 && (TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (arg0
)))
2985 != TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (arg1
)))))
2988 /* Check equality of integer constants before bailing out due to
2989 precision differences. */
2990 if (TREE_CODE (arg0
) == INTEGER_CST
&& TREE_CODE (arg1
) == INTEGER_CST
)
2992 /* Address of INTEGER_CST is not defined; check that we did not forget
2993 to drop the OEP_ADDRESS_OF flags. */
2994 gcc_checking_assert (!(flags
& OEP_ADDRESS_OF
));
2995 return tree_int_cst_equal (arg0
, arg1
);
2998 if (!(flags
& OEP_ADDRESS_OF
))
3000 /* If both types don't have the same signedness, then we can't consider
3001 them equal. We must check this before the STRIP_NOPS calls
3002 because they may change the signedness of the arguments. As pointers
3003 strictly don't have a signedness, require either two pointers or
3004 two non-pointers as well. */
3005 if (TYPE_UNSIGNED (TREE_TYPE (arg0
)) != TYPE_UNSIGNED (TREE_TYPE (arg1
))
3006 || POINTER_TYPE_P (TREE_TYPE (arg0
))
3007 != POINTER_TYPE_P (TREE_TYPE (arg1
)))
3010 /* If both types don't have the same precision, then it is not safe
3012 if (element_precision (TREE_TYPE (arg0
))
3013 != element_precision (TREE_TYPE (arg1
)))
3020 /* FIXME: Fortran FE currently produce ADDR_EXPR of NOP_EXPR. Enable the
3021 sanity check once the issue is solved. */
3023 /* Addresses of conversions and SSA_NAMEs (and many other things)
3024 are not defined. Check that we did not forget to drop the
3025 OEP_ADDRESS_OF/OEP_CONSTANT_ADDRESS_OF flags. */
3026 gcc_checking_assert (!CONVERT_EXPR_P (arg0
) && !CONVERT_EXPR_P (arg1
)
3027 && TREE_CODE (arg0
) != SSA_NAME
);
3030 /* In case both args are comparisons but with different comparison
3031 code, try to swap the comparison operands of one arg to produce
3032 a match and compare that variant. */
3033 if (TREE_CODE (arg0
) != TREE_CODE (arg1
)
3034 && COMPARISON_CLASS_P (arg0
)
3035 && COMPARISON_CLASS_P (arg1
))
3037 enum tree_code swap_code
= swap_tree_comparison (TREE_CODE (arg1
));
3039 if (TREE_CODE (arg0
) == swap_code
)
3040 return operand_equal_p (TREE_OPERAND (arg0
, 0),
3041 TREE_OPERAND (arg1
, 1), flags
)
3042 && operand_equal_p (TREE_OPERAND (arg0
, 1),
3043 TREE_OPERAND (arg1
, 0), flags
);
3046 if (TREE_CODE (arg0
) != TREE_CODE (arg1
))
3048 /* NOP_EXPR and CONVERT_EXPR are considered equal. */
3049 if (CONVERT_EXPR_P (arg0
) && CONVERT_EXPR_P (arg1
))
3051 else if (flags
& OEP_ADDRESS_OF
)
3053 /* If we are interested in comparing addresses ignore
3054 MEM_REF wrappings of the base that can appear just for
3056 if (TREE_CODE (arg0
) == MEM_REF
3058 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == ADDR_EXPR
3059 && TREE_OPERAND (TREE_OPERAND (arg0
, 0), 0) == arg1
3060 && integer_zerop (TREE_OPERAND (arg0
, 1)))
3062 else if (TREE_CODE (arg1
) == MEM_REF
3064 && TREE_CODE (TREE_OPERAND (arg1
, 0)) == ADDR_EXPR
3065 && TREE_OPERAND (TREE_OPERAND (arg1
, 0), 0) == arg0
3066 && integer_zerop (TREE_OPERAND (arg1
, 1)))
3074 /* When not checking adddresses, this is needed for conversions and for
3075 COMPONENT_REF. Might as well play it safe and always test this. */
3076 if (TREE_CODE (TREE_TYPE (arg0
)) == ERROR_MARK
3077 || TREE_CODE (TREE_TYPE (arg1
)) == ERROR_MARK
3078 || (TYPE_MODE (TREE_TYPE (arg0
)) != TYPE_MODE (TREE_TYPE (arg1
))
3079 && !(flags
& OEP_ADDRESS_OF
)))
3082 /* If ARG0 and ARG1 are the same SAVE_EXPR, they are necessarily equal.
3083 We don't care about side effects in that case because the SAVE_EXPR
3084 takes care of that for us. In all other cases, two expressions are
3085 equal if they have no side effects. If we have two identical
3086 expressions with side effects that should be treated the same due
3087 to the only side effects being identical SAVE_EXPR's, that will
3088 be detected in the recursive calls below.
3089 If we are taking an invariant address of two identical objects
3090 they are necessarily equal as well. */
3091 if (arg0
== arg1
&& ! (flags
& OEP_ONLY_CONST
)
3092 && (TREE_CODE (arg0
) == SAVE_EXPR
3093 || (flags
& OEP_MATCH_SIDE_EFFECTS
)
3094 || (! TREE_SIDE_EFFECTS (arg0
) && ! TREE_SIDE_EFFECTS (arg1
))))
3097 /* Next handle constant cases, those for which we can return 1 even
3098 if ONLY_CONST is set. */
3099 if (TREE_CONSTANT (arg0
) && TREE_CONSTANT (arg1
))
3100 switch (TREE_CODE (arg0
))
3103 return tree_int_cst_equal (arg0
, arg1
);
3106 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (arg0
),
3107 TREE_FIXED_CST (arg1
));
3110 if (real_identical (&TREE_REAL_CST (arg0
), &TREE_REAL_CST (arg1
)))
3113 if (!(flags
& OEP_BITWISE
) && !HONOR_SIGNED_ZEROS (arg0
))
3115 /* If we do not distinguish between signed and unsigned zero,
3116 consider them equal. */
3117 if (real_zerop (arg0
) && real_zerop (arg1
))
3124 if (VECTOR_CST_LOG2_NPATTERNS (arg0
)
3125 != VECTOR_CST_LOG2_NPATTERNS (arg1
))
3128 if (VECTOR_CST_NELTS_PER_PATTERN (arg0
)
3129 != VECTOR_CST_NELTS_PER_PATTERN (arg1
))
3132 unsigned int count
= vector_cst_encoded_nelts (arg0
);
3133 for (unsigned int i
= 0; i
< count
; ++i
)
3134 if (!operand_equal_p (VECTOR_CST_ENCODED_ELT (arg0
, i
),
3135 VECTOR_CST_ENCODED_ELT (arg1
, i
), flags
))
3141 return (operand_equal_p (TREE_REALPART (arg0
), TREE_REALPART (arg1
),
3143 && operand_equal_p (TREE_IMAGPART (arg0
), TREE_IMAGPART (arg1
),
3147 return (TREE_STRING_LENGTH (arg0
) == TREE_STRING_LENGTH (arg1
)
3148 && ! memcmp (TREE_STRING_POINTER (arg0
),
3149 TREE_STRING_POINTER (arg1
),
3150 TREE_STRING_LENGTH (arg0
)));
3153 gcc_checking_assert (!(flags
& OEP_ADDRESS_OF
));
3154 return operand_equal_p (TREE_OPERAND (arg0
, 0), TREE_OPERAND (arg1
, 0),
3155 flags
| OEP_ADDRESS_OF
3156 | OEP_MATCH_SIDE_EFFECTS
);
3158 /* In GIMPLE empty constructors are allowed in initializers of
3160 return !CONSTRUCTOR_NELTS (arg0
) && !CONSTRUCTOR_NELTS (arg1
);
3165 /* Don't handle more cases for OEP_BITWISE, since we can't guarantee that
3166 two instances of undefined behavior will give identical results. */
3167 if (flags
& (OEP_ONLY_CONST
| OEP_BITWISE
))
3170 /* Define macros to test an operand from arg0 and arg1 for equality and a
3171 variant that allows null and views null as being different from any
3172 non-null value. In the latter case, if either is null, the both
3173 must be; otherwise, do the normal comparison. */
3174 #define OP_SAME(N) operand_equal_p (TREE_OPERAND (arg0, N), \
3175 TREE_OPERAND (arg1, N), flags)
3177 #define OP_SAME_WITH_NULL(N) \
3178 ((!TREE_OPERAND (arg0, N) || !TREE_OPERAND (arg1, N)) \
3179 ? TREE_OPERAND (arg0, N) == TREE_OPERAND (arg1, N) : OP_SAME (N))
3181 switch (TREE_CODE_CLASS (TREE_CODE (arg0
)))
3184 /* Two conversions are equal only if signedness and modes match. */
3185 switch (TREE_CODE (arg0
))
3188 case FIX_TRUNC_EXPR
:
3189 if (TYPE_UNSIGNED (TREE_TYPE (arg0
))
3190 != TYPE_UNSIGNED (TREE_TYPE (arg1
)))
3200 case tcc_comparison
:
3202 if (OP_SAME (0) && OP_SAME (1))
3205 /* For commutative ops, allow the other order. */
3206 return (commutative_tree_code (TREE_CODE (arg0
))
3207 && operand_equal_p (TREE_OPERAND (arg0
, 0),
3208 TREE_OPERAND (arg1
, 1), flags
)
3209 && operand_equal_p (TREE_OPERAND (arg0
, 1),
3210 TREE_OPERAND (arg1
, 0), flags
));
3213 /* If either of the pointer (or reference) expressions we are
3214 dereferencing contain a side effect, these cannot be equal,
3215 but their addresses can be. */
3216 if ((flags
& OEP_MATCH_SIDE_EFFECTS
) == 0
3217 && (TREE_SIDE_EFFECTS (arg0
)
3218 || TREE_SIDE_EFFECTS (arg1
)))
3221 switch (TREE_CODE (arg0
))
3224 if (!(flags
& OEP_ADDRESS_OF
))
3226 if (TYPE_ALIGN (TREE_TYPE (arg0
))
3227 != TYPE_ALIGN (TREE_TYPE (arg1
)))
3229 /* Verify that the access types are compatible. */
3230 if (TYPE_MAIN_VARIANT (TREE_TYPE (arg0
))
3231 != TYPE_MAIN_VARIANT (TREE_TYPE (arg1
)))
3234 flags
&= ~OEP_ADDRESS_OF
;
3238 /* Require the same offset. */
3239 if (!operand_equal_p (TYPE_SIZE (TREE_TYPE (arg0
)),
3240 TYPE_SIZE (TREE_TYPE (arg1
)),
3241 flags
& ~OEP_ADDRESS_OF
))
3246 case VIEW_CONVERT_EXPR
:
3249 case TARGET_MEM_REF
:
3251 if (!(flags
& OEP_ADDRESS_OF
))
3253 /* Require equal access sizes */
3254 if (TYPE_SIZE (TREE_TYPE (arg0
)) != TYPE_SIZE (TREE_TYPE (arg1
))
3255 && (!TYPE_SIZE (TREE_TYPE (arg0
))
3256 || !TYPE_SIZE (TREE_TYPE (arg1
))
3257 || !operand_equal_p (TYPE_SIZE (TREE_TYPE (arg0
)),
3258 TYPE_SIZE (TREE_TYPE (arg1
)),
3261 /* Verify that access happens in similar types. */
3262 if (!types_compatible_p (TREE_TYPE (arg0
), TREE_TYPE (arg1
)))
3264 /* Verify that accesses are TBAA compatible. */
3265 if (!alias_ptr_types_compatible_p
3266 (TREE_TYPE (TREE_OPERAND (arg0
, 1)),
3267 TREE_TYPE (TREE_OPERAND (arg1
, 1)))
3268 || (MR_DEPENDENCE_CLIQUE (arg0
)
3269 != MR_DEPENDENCE_CLIQUE (arg1
))
3270 || (MR_DEPENDENCE_BASE (arg0
)
3271 != MR_DEPENDENCE_BASE (arg1
)))
3273 /* Verify that alignment is compatible. */
3274 if (TYPE_ALIGN (TREE_TYPE (arg0
))
3275 != TYPE_ALIGN (TREE_TYPE (arg1
)))
3278 flags
&= ~OEP_ADDRESS_OF
;
3279 return (OP_SAME (0) && OP_SAME (1)
3280 /* TARGET_MEM_REF require equal extra operands. */
3281 && (TREE_CODE (arg0
) != TARGET_MEM_REF
3282 || (OP_SAME_WITH_NULL (2)
3283 && OP_SAME_WITH_NULL (3)
3284 && OP_SAME_WITH_NULL (4))));
3287 case ARRAY_RANGE_REF
:
3290 flags
&= ~OEP_ADDRESS_OF
;
3291 /* Compare the array index by value if it is constant first as we
3292 may have different types but same value here. */
3293 return ((tree_int_cst_equal (TREE_OPERAND (arg0
, 1),
3294 TREE_OPERAND (arg1
, 1))
3296 && OP_SAME_WITH_NULL (2)
3297 && OP_SAME_WITH_NULL (3)
3298 /* Compare low bound and element size as with OEP_ADDRESS_OF
3299 we have to account for the offset of the ref. */
3300 && (TREE_TYPE (TREE_OPERAND (arg0
, 0))
3301 == TREE_TYPE (TREE_OPERAND (arg1
, 0))
3302 || (operand_equal_p (array_ref_low_bound
3303 (CONST_CAST_TREE (arg0
)),
3305 (CONST_CAST_TREE (arg1
)), flags
)
3306 && operand_equal_p (array_ref_element_size
3307 (CONST_CAST_TREE (arg0
)),
3308 array_ref_element_size
3309 (CONST_CAST_TREE (arg1
)),
3313 /* Handle operand 2 the same as for ARRAY_REF. Operand 0
3314 may be NULL when we're called to compare MEM_EXPRs. */
3315 if (!OP_SAME_WITH_NULL (0)
3318 flags
&= ~OEP_ADDRESS_OF
;
3319 return OP_SAME_WITH_NULL (2);
3324 flags
&= ~OEP_ADDRESS_OF
;
3325 return OP_SAME (1) && OP_SAME (2);
3327 /* Virtual table call. */
3330 if (!operand_equal_p (OBJ_TYPE_REF_EXPR (arg0
),
3331 OBJ_TYPE_REF_EXPR (arg1
), flags
))
3333 if (tree_to_uhwi (OBJ_TYPE_REF_TOKEN (arg0
))
3334 != tree_to_uhwi (OBJ_TYPE_REF_TOKEN (arg1
)))
3336 if (!operand_equal_p (OBJ_TYPE_REF_OBJECT (arg0
),
3337 OBJ_TYPE_REF_OBJECT (arg1
), flags
))
3339 if (!types_same_for_odr (obj_type_ref_class (arg0
),
3340 obj_type_ref_class (arg1
)))
3349 case tcc_expression
:
3350 switch (TREE_CODE (arg0
))
3353 /* Be sure we pass right ADDRESS_OF flag. */
3354 gcc_checking_assert (!(flags
& OEP_ADDRESS_OF
));
3355 return operand_equal_p (TREE_OPERAND (arg0
, 0),
3356 TREE_OPERAND (arg1
, 0),
3357 flags
| OEP_ADDRESS_OF
);
3359 case TRUTH_NOT_EXPR
:
3362 case TRUTH_ANDIF_EXPR
:
3363 case TRUTH_ORIF_EXPR
:
3364 return OP_SAME (0) && OP_SAME (1);
3366 case WIDEN_MULT_PLUS_EXPR
:
3367 case WIDEN_MULT_MINUS_EXPR
:
3370 /* The multiplcation operands are commutative. */
3373 case TRUTH_AND_EXPR
:
3375 case TRUTH_XOR_EXPR
:
3376 if (OP_SAME (0) && OP_SAME (1))
3379 /* Otherwise take into account this is a commutative operation. */
3380 return (operand_equal_p (TREE_OPERAND (arg0
, 0),
3381 TREE_OPERAND (arg1
, 1), flags
)
3382 && operand_equal_p (TREE_OPERAND (arg0
, 1),
3383 TREE_OPERAND (arg1
, 0), flags
));
3386 if (! OP_SAME (1) || ! OP_SAME_WITH_NULL (2))
3388 flags
&= ~OEP_ADDRESS_OF
;
3391 case BIT_INSERT_EXPR
:
3392 /* BIT_INSERT_EXPR has an implict operand as the type precision
3393 of op1. Need to check to make sure they are the same. */
3394 if (TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
3395 && TREE_CODE (TREE_OPERAND (arg1
, 1)) == INTEGER_CST
3396 && TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (arg0
, 1)))
3397 != TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (arg1
, 1))))
3403 return OP_SAME (0) && OP_SAME (1) && OP_SAME (2);
3408 case PREDECREMENT_EXPR
:
3409 case PREINCREMENT_EXPR
:
3410 case POSTDECREMENT_EXPR
:
3411 case POSTINCREMENT_EXPR
:
3412 if (flags
& OEP_LEXICOGRAPHIC
)
3413 return OP_SAME (0) && OP_SAME (1);
3416 case CLEANUP_POINT_EXPR
:
3419 if (flags
& OEP_LEXICOGRAPHIC
)
3428 switch (TREE_CODE (arg0
))
3431 if ((CALL_EXPR_FN (arg0
) == NULL_TREE
)
3432 != (CALL_EXPR_FN (arg1
) == NULL_TREE
))
3433 /* If not both CALL_EXPRs are either internal or normal function
3434 functions, then they are not equal. */
3436 else if (CALL_EXPR_FN (arg0
) == NULL_TREE
)
3438 /* If the CALL_EXPRs call different internal functions, then they
3440 if (CALL_EXPR_IFN (arg0
) != CALL_EXPR_IFN (arg1
))
3445 /* If the CALL_EXPRs call different functions, then they are not
3447 if (! operand_equal_p (CALL_EXPR_FN (arg0
), CALL_EXPR_FN (arg1
),
3452 /* FIXME: We could skip this test for OEP_MATCH_SIDE_EFFECTS. */
3454 unsigned int cef
= call_expr_flags (arg0
);
3455 if (flags
& OEP_PURE_SAME
)
3456 cef
&= ECF_CONST
| ECF_PURE
;
3459 if (!cef
&& !(flags
& OEP_LEXICOGRAPHIC
))
3463 /* Now see if all the arguments are the same. */
3465 const_call_expr_arg_iterator iter0
, iter1
;
3467 for (a0
= first_const_call_expr_arg (arg0
, &iter0
),
3468 a1
= first_const_call_expr_arg (arg1
, &iter1
);
3470 a0
= next_const_call_expr_arg (&iter0
),
3471 a1
= next_const_call_expr_arg (&iter1
))
3472 if (! operand_equal_p (a0
, a1
, flags
))
3475 /* If we get here and both argument lists are exhausted
3476 then the CALL_EXPRs are equal. */
3477 return ! (a0
|| a1
);
3483 case tcc_declaration
:
3484 /* Consider __builtin_sqrt equal to sqrt. */
3485 return (TREE_CODE (arg0
) == FUNCTION_DECL
3486 && fndecl_built_in_p (arg0
) && fndecl_built_in_p (arg1
)
3487 && DECL_BUILT_IN_CLASS (arg0
) == DECL_BUILT_IN_CLASS (arg1
)
3488 && (DECL_UNCHECKED_FUNCTION_CODE (arg0
)
3489 == DECL_UNCHECKED_FUNCTION_CODE (arg1
)));
3491 case tcc_exceptional
:
3492 if (TREE_CODE (arg0
) == CONSTRUCTOR
)
3494 if (CONSTRUCTOR_NO_CLEARING (arg0
) != CONSTRUCTOR_NO_CLEARING (arg1
))
3497 /* In GIMPLE constructors are used only to build vectors from
3498 elements. Individual elements in the constructor must be
3499 indexed in increasing order and form an initial sequence.
3501 We make no effort to compare constructors in generic.
3502 (see sem_variable::equals in ipa-icf which can do so for
3504 if (!VECTOR_TYPE_P (TREE_TYPE (arg0
))
3505 || !VECTOR_TYPE_P (TREE_TYPE (arg1
)))
3508 /* Be sure that vectors constructed have the same representation.
3509 We only tested element precision and modes to match.
3510 Vectors may be BLKmode and thus also check that the number of
3512 if (maybe_ne (TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg0
)),
3513 TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg1
))))
3516 vec
<constructor_elt
, va_gc
> *v0
= CONSTRUCTOR_ELTS (arg0
);
3517 vec
<constructor_elt
, va_gc
> *v1
= CONSTRUCTOR_ELTS (arg1
);
3518 unsigned int len
= vec_safe_length (v0
);
3520 if (len
!= vec_safe_length (v1
))
3523 for (unsigned int i
= 0; i
< len
; i
++)
3525 constructor_elt
*c0
= &(*v0
)[i
];
3526 constructor_elt
*c1
= &(*v1
)[i
];
3528 if (!operand_equal_p (c0
->value
, c1
->value
, flags
)
3529 /* In GIMPLE the indexes can be either NULL or matching i.
3530 Double check this so we won't get false
3531 positives for GENERIC. */
3533 && (TREE_CODE (c0
->index
) != INTEGER_CST
3534 || compare_tree_int (c0
->index
, i
)))
3536 && (TREE_CODE (c1
->index
) != INTEGER_CST
3537 || compare_tree_int (c1
->index
, i
))))
3542 else if (TREE_CODE (arg0
) == STATEMENT_LIST
3543 && (flags
& OEP_LEXICOGRAPHIC
))
3545 /* Compare the STATEMENT_LISTs. */
3546 tree_stmt_iterator tsi1
, tsi2
;
3547 tree body1
= CONST_CAST_TREE (arg0
);
3548 tree body2
= CONST_CAST_TREE (arg1
);
3549 for (tsi1
= tsi_start (body1
), tsi2
= tsi_start (body2
); ;
3550 tsi_next (&tsi1
), tsi_next (&tsi2
))
3552 /* The lists don't have the same number of statements. */
3553 if (tsi_end_p (tsi1
) ^ tsi_end_p (tsi2
))
3555 if (tsi_end_p (tsi1
) && tsi_end_p (tsi2
))
3557 if (!operand_equal_p (tsi_stmt (tsi1
), tsi_stmt (tsi2
),
3558 flags
& (OEP_LEXICOGRAPHIC
3559 | OEP_NO_HASH_CHECK
)))
3566 switch (TREE_CODE (arg0
))
3569 if (flags
& OEP_LEXICOGRAPHIC
)
3570 return OP_SAME_WITH_NULL (0);
3572 case DEBUG_BEGIN_STMT
:
3573 if (flags
& OEP_LEXICOGRAPHIC
)
3585 #undef OP_SAME_WITH_NULL
3588 /* Generate a hash value for an expression. This can be used iteratively
3589 by passing a previous result as the HSTATE argument. */
3592 operand_compare::hash_operand (const_tree t
, inchash::hash
&hstate
,
3596 enum tree_code code
;
3597 enum tree_code_class tclass
;
3599 if (t
== NULL_TREE
|| t
== error_mark_node
)
3601 hstate
.merge_hash (0);
3605 STRIP_ANY_LOCATION_WRAPPER (t
);
3607 if (!(flags
& OEP_ADDRESS_OF
))
3610 code
= TREE_CODE (t
);
3614 /* Alas, constants aren't shared, so we can't rely on pointer
3617 hstate
.merge_hash (0);
3620 gcc_checking_assert (!(flags
& OEP_ADDRESS_OF
));
3621 for (i
= 0; i
< TREE_INT_CST_EXT_NUNITS (t
); i
++)
3622 hstate
.add_hwi (TREE_INT_CST_ELT (t
, i
));
3627 if (!HONOR_SIGNED_ZEROS (t
) && real_zerop (t
))
3630 val2
= real_hash (TREE_REAL_CST_PTR (t
));
3631 hstate
.merge_hash (val2
);
3636 unsigned int val2
= fixed_hash (TREE_FIXED_CST_PTR (t
));
3637 hstate
.merge_hash (val2
);
3641 hstate
.add ((const void *) TREE_STRING_POINTER (t
),
3642 TREE_STRING_LENGTH (t
));
3645 hash_operand (TREE_REALPART (t
), hstate
, flags
);
3646 hash_operand (TREE_IMAGPART (t
), hstate
, flags
);
3650 hstate
.add_int (VECTOR_CST_NPATTERNS (t
));
3651 hstate
.add_int (VECTOR_CST_NELTS_PER_PATTERN (t
));
3652 unsigned int count
= vector_cst_encoded_nelts (t
);
3653 for (unsigned int i
= 0; i
< count
; ++i
)
3654 hash_operand (VECTOR_CST_ENCODED_ELT (t
, i
), hstate
, flags
);
3658 /* We can just compare by pointer. */
3659 hstate
.add_hwi (SSA_NAME_VERSION (t
));
3661 case PLACEHOLDER_EXPR
:
3662 /* The node itself doesn't matter. */
3669 /* A list of expressions, for a CALL_EXPR or as the elements of a
3671 for (; t
; t
= TREE_CHAIN (t
))
3672 hash_operand (TREE_VALUE (t
), hstate
, flags
);
3676 unsigned HOST_WIDE_INT idx
;
3678 flags
&= ~OEP_ADDRESS_OF
;
3679 hstate
.add_int (CONSTRUCTOR_NO_CLEARING (t
));
3680 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (t
), idx
, field
, value
)
3682 /* In GIMPLE the indexes can be either NULL or matching i. */
3683 if (field
== NULL_TREE
)
3684 field
= bitsize_int (idx
);
3685 hash_operand (field
, hstate
, flags
);
3686 hash_operand (value
, hstate
, flags
);
3690 case STATEMENT_LIST
:
3692 tree_stmt_iterator i
;
3693 for (i
= tsi_start (CONST_CAST_TREE (t
));
3694 !tsi_end_p (i
); tsi_next (&i
))
3695 hash_operand (tsi_stmt (i
), hstate
, flags
);
3699 for (i
= 0; i
< TREE_VEC_LENGTH (t
); ++i
)
3700 hash_operand (TREE_VEC_ELT (t
, i
), hstate
, flags
);
3702 case IDENTIFIER_NODE
:
3703 hstate
.add_object (IDENTIFIER_HASH_VALUE (t
));
3706 /* When referring to a built-in FUNCTION_DECL, use the __builtin__ form.
3707 Otherwise nodes that compare equal according to operand_equal_p might
3708 get different hash codes. However, don't do this for machine specific
3709 or front end builtins, since the function code is overloaded in those
3711 if (DECL_BUILT_IN_CLASS (t
) == BUILT_IN_NORMAL
3712 && builtin_decl_explicit_p (DECL_FUNCTION_CODE (t
)))
3714 t
= builtin_decl_explicit (DECL_FUNCTION_CODE (t
));
3715 code
= TREE_CODE (t
);
3719 if (POLY_INT_CST_P (t
))
3721 for (unsigned int i
= 0; i
< NUM_POLY_INT_COEFFS
; ++i
)
3722 hstate
.add_wide_int (wi::to_wide (POLY_INT_CST_COEFF (t
, i
)));
3725 tclass
= TREE_CODE_CLASS (code
);
3727 if (tclass
== tcc_declaration
)
3729 /* DECL's have a unique ID */
3730 hstate
.add_hwi (DECL_UID (t
));
3732 else if (tclass
== tcc_comparison
&& !commutative_tree_code (code
))
3734 /* For comparisons that can be swapped, use the lower
3736 enum tree_code ccode
= swap_tree_comparison (code
);
3739 hstate
.add_object (ccode
);
3740 hash_operand (TREE_OPERAND (t
, ccode
!= code
), hstate
, flags
);
3741 hash_operand (TREE_OPERAND (t
, ccode
== code
), hstate
, flags
);
3743 else if (CONVERT_EXPR_CODE_P (code
))
3745 /* NOP_EXPR and CONVERT_EXPR are considered equal by
3747 enum tree_code ccode
= NOP_EXPR
;
3748 hstate
.add_object (ccode
);
3750 /* Don't hash the type, that can lead to having nodes which
3751 compare equal according to operand_equal_p, but which
3752 have different hash codes. Make sure to include signedness
3753 in the hash computation. */
3754 hstate
.add_int (TYPE_UNSIGNED (TREE_TYPE (t
)));
3755 hash_operand (TREE_OPERAND (t
, 0), hstate
, flags
);
3757 /* For OEP_ADDRESS_OF, hash MEM_EXPR[&decl, 0] the same as decl. */
3758 else if (code
== MEM_REF
3759 && (flags
& OEP_ADDRESS_OF
) != 0
3760 && TREE_CODE (TREE_OPERAND (t
, 0)) == ADDR_EXPR
3761 && DECL_P (TREE_OPERAND (TREE_OPERAND (t
, 0), 0))
3762 && integer_zerop (TREE_OPERAND (t
, 1)))
3763 hash_operand (TREE_OPERAND (TREE_OPERAND (t
, 0), 0),
3765 /* Don't ICE on FE specific trees, or their arguments etc.
3766 during operand_equal_p hash verification. */
3767 else if (!IS_EXPR_CODE_CLASS (tclass
))
3768 gcc_assert (flags
& OEP_HASH_CHECK
);
3771 unsigned int sflags
= flags
;
3773 hstate
.add_object (code
);
3778 gcc_checking_assert (!(flags
& OEP_ADDRESS_OF
));
3779 flags
|= OEP_ADDRESS_OF
;
3785 case TARGET_MEM_REF
:
3786 flags
&= ~OEP_ADDRESS_OF
;
3791 case ARRAY_RANGE_REF
:
3794 sflags
&= ~OEP_ADDRESS_OF
;
3798 flags
&= ~OEP_ADDRESS_OF
;
3801 case WIDEN_MULT_PLUS_EXPR
:
3802 case WIDEN_MULT_MINUS_EXPR
:
3804 /* The multiplication operands are commutative. */
3805 inchash::hash one
, two
;
3806 hash_operand (TREE_OPERAND (t
, 0), one
, flags
);
3807 hash_operand (TREE_OPERAND (t
, 1), two
, flags
);
3808 hstate
.add_commutative (one
, two
);
3809 hash_operand (TREE_OPERAND (t
, 2), two
, flags
);
3814 if (CALL_EXPR_FN (t
) == NULL_TREE
)
3815 hstate
.add_int (CALL_EXPR_IFN (t
));
3819 /* For TARGET_EXPR, just hash on the TARGET_EXPR_SLOT.
3820 Usually different TARGET_EXPRs just should use
3821 different temporaries in their slots. */
3822 hash_operand (TARGET_EXPR_SLOT (t
), hstate
, flags
);
3825 /* Virtual table call. */
3827 inchash::add_expr (OBJ_TYPE_REF_EXPR (t
), hstate
, flags
);
3828 inchash::add_expr (OBJ_TYPE_REF_TOKEN (t
), hstate
, flags
);
3829 inchash::add_expr (OBJ_TYPE_REF_OBJECT (t
), hstate
, flags
);
3835 /* Don't hash the type, that can lead to having nodes which
3836 compare equal according to operand_equal_p, but which
3837 have different hash codes. */
3838 if (code
== NON_LVALUE_EXPR
)
3840 /* Make sure to include signness in the hash computation. */
3841 hstate
.add_int (TYPE_UNSIGNED (TREE_TYPE (t
)));
3842 hash_operand (TREE_OPERAND (t
, 0), hstate
, flags
);
3845 else if (commutative_tree_code (code
))
3847 /* It's a commutative expression. We want to hash it the same
3848 however it appears. We do this by first hashing both operands
3849 and then rehashing based on the order of their independent
3851 inchash::hash one
, two
;
3852 hash_operand (TREE_OPERAND (t
, 0), one
, flags
);
3853 hash_operand (TREE_OPERAND (t
, 1), two
, flags
);
3854 hstate
.add_commutative (one
, two
);
3857 for (i
= TREE_OPERAND_LENGTH (t
) - 1; i
>= 0; --i
)
3858 hash_operand (TREE_OPERAND (t
, i
), hstate
,
3859 i
== 0 ? flags
: sflags
);
3866 operand_compare::verify_hash_value (const_tree arg0
, const_tree arg1
,
3867 unsigned int flags
, bool *ret
)
3869 /* When checking, verify at the outermost operand_equal_p call that
3870 if operand_equal_p returns non-zero then ARG0 and ARG1 has the same
3872 if (flag_checking
&& !(flags
& OEP_NO_HASH_CHECK
))
3874 if (operand_equal_p (arg0
, arg1
, flags
| OEP_NO_HASH_CHECK
))
3878 inchash::hash
hstate0 (0), hstate1 (0);
3879 hash_operand (arg0
, hstate0
, flags
| OEP_HASH_CHECK
);
3880 hash_operand (arg1
, hstate1
, flags
| OEP_HASH_CHECK
);
3881 hashval_t h0
= hstate0
.end ();
3882 hashval_t h1
= hstate1
.end ();
3883 gcc_assert (h0
== h1
);
3897 static operand_compare default_compare_instance
;
3899 /* Conveinece wrapper around operand_compare class because usually we do
3900 not need to play with the valueizer. */
3903 operand_equal_p (const_tree arg0
, const_tree arg1
, unsigned int flags
)
3905 return default_compare_instance
.operand_equal_p (arg0
, arg1
, flags
);
3911 /* Generate a hash value for an expression. This can be used iteratively
3912 by passing a previous result as the HSTATE argument.
3914 This function is intended to produce the same hash for expressions which
3915 would compare equal using operand_equal_p. */
3917 add_expr (const_tree t
, inchash::hash
&hstate
, unsigned int flags
)
3919 default_compare_instance
.hash_operand (t
, hstate
, flags
);
3924 /* Similar to operand_equal_p, but see if ARG0 might be a variant of ARG1
3925 with a different signedness or a narrower precision. */
3928 operand_equal_for_comparison_p (tree arg0
, tree arg1
)
3930 if (operand_equal_p (arg0
, arg1
, 0))
3933 if (! INTEGRAL_TYPE_P (TREE_TYPE (arg0
))
3934 || ! INTEGRAL_TYPE_P (TREE_TYPE (arg1
)))
3937 /* Discard any conversions that don't change the modes of ARG0 and ARG1
3938 and see if the inner values are the same. This removes any
3939 signedness comparison, which doesn't matter here. */
3944 if (operand_equal_p (op0
, op1
, 0))
3947 /* Discard a single widening conversion from ARG1 and see if the inner
3948 value is the same as ARG0. */
3949 if (CONVERT_EXPR_P (arg1
)
3950 && INTEGRAL_TYPE_P (TREE_TYPE (TREE_OPERAND (arg1
, 0)))
3951 && TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (arg1
, 0)))
3952 < TYPE_PRECISION (TREE_TYPE (arg1
))
3953 && operand_equal_p (arg0
, TREE_OPERAND (arg1
, 0), 0))
3959 /* See if ARG is an expression that is either a comparison or is performing
3960 arithmetic on comparisons. The comparisons must only be comparing
3961 two different values, which will be stored in *CVAL1 and *CVAL2; if
3962 they are nonzero it means that some operands have already been found.
3963 No variables may be used anywhere else in the expression except in the
3966 If this is true, return 1. Otherwise, return zero. */
3969 twoval_comparison_p (tree arg
, tree
*cval1
, tree
*cval2
)
3971 enum tree_code code
= TREE_CODE (arg
);
3972 enum tree_code_class tclass
= TREE_CODE_CLASS (code
);
3974 /* We can handle some of the tcc_expression cases here. */
3975 if (tclass
== tcc_expression
&& code
== TRUTH_NOT_EXPR
)
3977 else if (tclass
== tcc_expression
3978 && (code
== TRUTH_ANDIF_EXPR
|| code
== TRUTH_ORIF_EXPR
3979 || code
== COMPOUND_EXPR
))
3980 tclass
= tcc_binary
;
3985 return twoval_comparison_p (TREE_OPERAND (arg
, 0), cval1
, cval2
);
3988 return (twoval_comparison_p (TREE_OPERAND (arg
, 0), cval1
, cval2
)
3989 && twoval_comparison_p (TREE_OPERAND (arg
, 1), cval1
, cval2
));
3994 case tcc_expression
:
3995 if (code
== COND_EXPR
)
3996 return (twoval_comparison_p (TREE_OPERAND (arg
, 0), cval1
, cval2
)
3997 && twoval_comparison_p (TREE_OPERAND (arg
, 1), cval1
, cval2
)
3998 && twoval_comparison_p (TREE_OPERAND (arg
, 2), cval1
, cval2
));
4001 case tcc_comparison
:
4002 /* First see if we can handle the first operand, then the second. For
4003 the second operand, we know *CVAL1 can't be zero. It must be that
4004 one side of the comparison is each of the values; test for the
4005 case where this isn't true by failing if the two operands
4008 if (operand_equal_p (TREE_OPERAND (arg
, 0),
4009 TREE_OPERAND (arg
, 1), 0))
4013 *cval1
= TREE_OPERAND (arg
, 0);
4014 else if (operand_equal_p (*cval1
, TREE_OPERAND (arg
, 0), 0))
4016 else if (*cval2
== 0)
4017 *cval2
= TREE_OPERAND (arg
, 0);
4018 else if (operand_equal_p (*cval2
, TREE_OPERAND (arg
, 0), 0))
4023 if (operand_equal_p (*cval1
, TREE_OPERAND (arg
, 1), 0))
4025 else if (*cval2
== 0)
4026 *cval2
= TREE_OPERAND (arg
, 1);
4027 else if (operand_equal_p (*cval2
, TREE_OPERAND (arg
, 1), 0))
4039 /* ARG is a tree that is known to contain just arithmetic operations and
4040 comparisons. Evaluate the operations in the tree substituting NEW0 for
4041 any occurrence of OLD0 as an operand of a comparison and likewise for
4045 eval_subst (location_t loc
, tree arg
, tree old0
, tree new0
,
4046 tree old1
, tree new1
)
4048 tree type
= TREE_TYPE (arg
);
4049 enum tree_code code
= TREE_CODE (arg
);
4050 enum tree_code_class tclass
= TREE_CODE_CLASS (code
);
4052 /* We can handle some of the tcc_expression cases here. */
4053 if (tclass
== tcc_expression
&& code
== TRUTH_NOT_EXPR
)
4055 else if (tclass
== tcc_expression
4056 && (code
== TRUTH_ANDIF_EXPR
|| code
== TRUTH_ORIF_EXPR
))
4057 tclass
= tcc_binary
;
4062 return fold_build1_loc (loc
, code
, type
,
4063 eval_subst (loc
, TREE_OPERAND (arg
, 0),
4064 old0
, new0
, old1
, new1
));
4067 return fold_build2_loc (loc
, code
, type
,
4068 eval_subst (loc
, TREE_OPERAND (arg
, 0),
4069 old0
, new0
, old1
, new1
),
4070 eval_subst (loc
, TREE_OPERAND (arg
, 1),
4071 old0
, new0
, old1
, new1
));
4073 case tcc_expression
:
4077 return eval_subst (loc
, TREE_OPERAND (arg
, 0), old0
, new0
,
4081 return eval_subst (loc
, TREE_OPERAND (arg
, 1), old0
, new0
,
4085 return fold_build3_loc (loc
, code
, type
,
4086 eval_subst (loc
, TREE_OPERAND (arg
, 0),
4087 old0
, new0
, old1
, new1
),
4088 eval_subst (loc
, TREE_OPERAND (arg
, 1),
4089 old0
, new0
, old1
, new1
),
4090 eval_subst (loc
, TREE_OPERAND (arg
, 2),
4091 old0
, new0
, old1
, new1
));
4095 /* Fall through - ??? */
4097 case tcc_comparison
:
4099 tree arg0
= TREE_OPERAND (arg
, 0);
4100 tree arg1
= TREE_OPERAND (arg
, 1);
4102 /* We need to check both for exact equality and tree equality. The
4103 former will be true if the operand has a side-effect. In that
4104 case, we know the operand occurred exactly once. */
4106 if (arg0
== old0
|| operand_equal_p (arg0
, old0
, 0))
4108 else if (arg0
== old1
|| operand_equal_p (arg0
, old1
, 0))
4111 if (arg1
== old0
|| operand_equal_p (arg1
, old0
, 0))
4113 else if (arg1
== old1
|| operand_equal_p (arg1
, old1
, 0))
4116 return fold_build2_loc (loc
, code
, type
, arg0
, arg1
);
4124 /* Return a tree for the case when the result of an expression is RESULT
4125 converted to TYPE and OMITTED was previously an operand of the expression
4126 but is now not needed (e.g., we folded OMITTED * 0).
4128 If OMITTED has side effects, we must evaluate it. Otherwise, just do
4129 the conversion of RESULT to TYPE. */
4132 omit_one_operand_loc (location_t loc
, tree type
, tree result
, tree omitted
)
4134 tree t
= fold_convert_loc (loc
, type
, result
);
4136 /* If the resulting operand is an empty statement, just return the omitted
4137 statement casted to void. */
4138 if (IS_EMPTY_STMT (t
) && TREE_SIDE_EFFECTS (omitted
))
4139 return build1_loc (loc
, NOP_EXPR
, void_type_node
,
4140 fold_ignored_result (omitted
));
4142 if (TREE_SIDE_EFFECTS (omitted
))
4143 return build2_loc (loc
, COMPOUND_EXPR
, type
,
4144 fold_ignored_result (omitted
), t
);
4146 return non_lvalue_loc (loc
, t
);
4149 /* Return a tree for the case when the result of an expression is RESULT
4150 converted to TYPE and OMITTED1 and OMITTED2 were previously operands
4151 of the expression but are now not needed.
4153 If OMITTED1 or OMITTED2 has side effects, they must be evaluated.
4154 If both OMITTED1 and OMITTED2 have side effects, OMITTED1 is
4155 evaluated before OMITTED2. Otherwise, if neither has side effects,
4156 just do the conversion of RESULT to TYPE. */
4159 omit_two_operands_loc (location_t loc
, tree type
, tree result
,
4160 tree omitted1
, tree omitted2
)
4162 tree t
= fold_convert_loc (loc
, type
, result
);
4164 if (TREE_SIDE_EFFECTS (omitted2
))
4165 t
= build2_loc (loc
, COMPOUND_EXPR
, type
, omitted2
, t
);
4166 if (TREE_SIDE_EFFECTS (omitted1
))
4167 t
= build2_loc (loc
, COMPOUND_EXPR
, type
, omitted1
, t
);
4169 return TREE_CODE (t
) != COMPOUND_EXPR
? non_lvalue_loc (loc
, t
) : t
;
4173 /* Return a simplified tree node for the truth-negation of ARG. This
4174 never alters ARG itself. We assume that ARG is an operation that
4175 returns a truth value (0 or 1).
4177 FIXME: one would think we would fold the result, but it causes
4178 problems with the dominator optimizer. */
4181 fold_truth_not_expr (location_t loc
, tree arg
)
4183 tree type
= TREE_TYPE (arg
);
4184 enum tree_code code
= TREE_CODE (arg
);
4185 location_t loc1
, loc2
;
4187 /* If this is a comparison, we can simply invert it, except for
4188 floating-point non-equality comparisons, in which case we just
4189 enclose a TRUTH_NOT_EXPR around what we have. */
4191 if (TREE_CODE_CLASS (code
) == tcc_comparison
)
4193 tree op_type
= TREE_TYPE (TREE_OPERAND (arg
, 0));
4194 if (FLOAT_TYPE_P (op_type
)
4195 && flag_trapping_math
4196 && code
!= ORDERED_EXPR
&& code
!= UNORDERED_EXPR
4197 && code
!= NE_EXPR
&& code
!= EQ_EXPR
)
4200 code
= invert_tree_comparison (code
, HONOR_NANS (op_type
));
4201 if (code
== ERROR_MARK
)
4204 tree ret
= build2_loc (loc
, code
, type
, TREE_OPERAND (arg
, 0),
4205 TREE_OPERAND (arg
, 1));
4206 if (TREE_NO_WARNING (arg
))
4207 TREE_NO_WARNING (ret
) = 1;
4214 return constant_boolean_node (integer_zerop (arg
), type
);
4216 case TRUTH_AND_EXPR
:
4217 loc1
= expr_location_or (TREE_OPERAND (arg
, 0), loc
);
4218 loc2
= expr_location_or (TREE_OPERAND (arg
, 1), loc
);
4219 return build2_loc (loc
, TRUTH_OR_EXPR
, type
,
4220 invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 0)),
4221 invert_truthvalue_loc (loc2
, TREE_OPERAND (arg
, 1)));
4224 loc1
= expr_location_or (TREE_OPERAND (arg
, 0), loc
);
4225 loc2
= expr_location_or (TREE_OPERAND (arg
, 1), loc
);
4226 return build2_loc (loc
, TRUTH_AND_EXPR
, type
,
4227 invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 0)),
4228 invert_truthvalue_loc (loc2
, TREE_OPERAND (arg
, 1)));
4230 case TRUTH_XOR_EXPR
:
4231 /* Here we can invert either operand. We invert the first operand
4232 unless the second operand is a TRUTH_NOT_EXPR in which case our
4233 result is the XOR of the first operand with the inside of the
4234 negation of the second operand. */
4236 if (TREE_CODE (TREE_OPERAND (arg
, 1)) == TRUTH_NOT_EXPR
)
4237 return build2_loc (loc
, TRUTH_XOR_EXPR
, type
, TREE_OPERAND (arg
, 0),
4238 TREE_OPERAND (TREE_OPERAND (arg
, 1), 0));
4240 return build2_loc (loc
, TRUTH_XOR_EXPR
, type
,
4241 invert_truthvalue_loc (loc
, TREE_OPERAND (arg
, 0)),
4242 TREE_OPERAND (arg
, 1));
4244 case TRUTH_ANDIF_EXPR
:
4245 loc1
= expr_location_or (TREE_OPERAND (arg
, 0), loc
);
4246 loc2
= expr_location_or (TREE_OPERAND (arg
, 1), loc
);
4247 return build2_loc (loc
, TRUTH_ORIF_EXPR
, type
,
4248 invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 0)),
4249 invert_truthvalue_loc (loc2
, TREE_OPERAND (arg
, 1)));
4251 case TRUTH_ORIF_EXPR
:
4252 loc1
= expr_location_or (TREE_OPERAND (arg
, 0), loc
);
4253 loc2
= expr_location_or (TREE_OPERAND (arg
, 1), loc
);
4254 return build2_loc (loc
, TRUTH_ANDIF_EXPR
, type
,
4255 invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 0)),
4256 invert_truthvalue_loc (loc2
, TREE_OPERAND (arg
, 1)));
4258 case TRUTH_NOT_EXPR
:
4259 return TREE_OPERAND (arg
, 0);
4263 tree arg1
= TREE_OPERAND (arg
, 1);
4264 tree arg2
= TREE_OPERAND (arg
, 2);
4266 loc1
= expr_location_or (TREE_OPERAND (arg
, 1), loc
);
4267 loc2
= expr_location_or (TREE_OPERAND (arg
, 2), loc
);
4269 /* A COND_EXPR may have a throw as one operand, which
4270 then has void type. Just leave void operands
4272 return build3_loc (loc
, COND_EXPR
, type
, TREE_OPERAND (arg
, 0),
4273 VOID_TYPE_P (TREE_TYPE (arg1
))
4274 ? arg1
: invert_truthvalue_loc (loc1
, arg1
),
4275 VOID_TYPE_P (TREE_TYPE (arg2
))
4276 ? arg2
: invert_truthvalue_loc (loc2
, arg2
));
4280 loc1
= expr_location_or (TREE_OPERAND (arg
, 1), loc
);
4281 return build2_loc (loc
, COMPOUND_EXPR
, type
,
4282 TREE_OPERAND (arg
, 0),
4283 invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 1)));
4285 case NON_LVALUE_EXPR
:
4286 loc1
= expr_location_or (TREE_OPERAND (arg
, 0), loc
);
4287 return invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 0));
4290 if (TREE_CODE (TREE_TYPE (arg
)) == BOOLEAN_TYPE
)
4291 return build1_loc (loc
, TRUTH_NOT_EXPR
, type
, arg
);
4296 loc1
= expr_location_or (TREE_OPERAND (arg
, 0), loc
);
4297 return build1_loc (loc
, TREE_CODE (arg
), type
,
4298 invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 0)));
4301 if (!integer_onep (TREE_OPERAND (arg
, 1)))
4303 return build2_loc (loc
, EQ_EXPR
, type
, arg
, build_int_cst (type
, 0));
4306 return build1_loc (loc
, TRUTH_NOT_EXPR
, type
, arg
);
4308 case CLEANUP_POINT_EXPR
:
4309 loc1
= expr_location_or (TREE_OPERAND (arg
, 0), loc
);
4310 return build1_loc (loc
, CLEANUP_POINT_EXPR
, type
,
4311 invert_truthvalue_loc (loc1
, TREE_OPERAND (arg
, 0)));
4318 /* Fold the truth-negation of ARG. This never alters ARG itself. We
4319 assume that ARG is an operation that returns a truth value (0 or 1
4320 for scalars, 0 or -1 for vectors). Return the folded expression if
4321 folding is successful. Otherwise, return NULL_TREE. */
4324 fold_invert_truthvalue (location_t loc
, tree arg
)
4326 tree type
= TREE_TYPE (arg
);
4327 return fold_unary_loc (loc
, VECTOR_TYPE_P (type
)
4333 /* Return a simplified tree node for the truth-negation of ARG. This
4334 never alters ARG itself. We assume that ARG is an operation that
4335 returns a truth value (0 or 1 for scalars, 0 or -1 for vectors). */
4338 invert_truthvalue_loc (location_t loc
, tree arg
)
4340 if (TREE_CODE (arg
) == ERROR_MARK
)
4343 tree type
= TREE_TYPE (arg
);
4344 return fold_build1_loc (loc
, VECTOR_TYPE_P (type
)
4350 /* Return a BIT_FIELD_REF of type TYPE to refer to BITSIZE bits of INNER
4351 starting at BITPOS. The field is unsigned if UNSIGNEDP is nonzero
4352 and uses reverse storage order if REVERSEP is nonzero. ORIG_INNER
4353 is the original memory reference used to preserve the alias set of
4357 make_bit_field_ref (location_t loc
, tree inner
, tree orig_inner
, tree type
,
4358 HOST_WIDE_INT bitsize
, poly_int64 bitpos
,
4359 int unsignedp
, int reversep
)
4361 tree result
, bftype
;
4363 /* Attempt not to lose the access path if possible. */
4364 if (TREE_CODE (orig_inner
) == COMPONENT_REF
)
4366 tree ninner
= TREE_OPERAND (orig_inner
, 0);
4368 poly_int64 nbitsize
, nbitpos
;
4370 int nunsignedp
, nreversep
, nvolatilep
= 0;
4371 tree base
= get_inner_reference (ninner
, &nbitsize
, &nbitpos
,
4372 &noffset
, &nmode
, &nunsignedp
,
4373 &nreversep
, &nvolatilep
);
4375 && noffset
== NULL_TREE
4376 && known_subrange_p (bitpos
, bitsize
, nbitpos
, nbitsize
)
4386 alias_set_type iset
= get_alias_set (orig_inner
);
4387 if (iset
== 0 && get_alias_set (inner
) != iset
)
4388 inner
= fold_build2 (MEM_REF
, TREE_TYPE (inner
),
4389 build_fold_addr_expr (inner
),
4390 build_int_cst (ptr_type_node
, 0));
4392 if (known_eq (bitpos
, 0) && !reversep
)
4394 tree size
= TYPE_SIZE (TREE_TYPE (inner
));
4395 if ((INTEGRAL_TYPE_P (TREE_TYPE (inner
))
4396 || POINTER_TYPE_P (TREE_TYPE (inner
)))
4397 && tree_fits_shwi_p (size
)
4398 && tree_to_shwi (size
) == bitsize
)
4399 return fold_convert_loc (loc
, type
, inner
);
4403 if (TYPE_PRECISION (bftype
) != bitsize
4404 || TYPE_UNSIGNED (bftype
) == !unsignedp
)
4405 bftype
= build_nonstandard_integer_type (bitsize
, 0);
4407 result
= build3_loc (loc
, BIT_FIELD_REF
, bftype
, inner
,
4408 bitsize_int (bitsize
), bitsize_int (bitpos
));
4409 REF_REVERSE_STORAGE_ORDER (result
) = reversep
;
4412 result
= fold_convert_loc (loc
, type
, result
);
4417 /* Optimize a bit-field compare.
4419 There are two cases: First is a compare against a constant and the
4420 second is a comparison of two items where the fields are at the same
4421 bit position relative to the start of a chunk (byte, halfword, word)
4422 large enough to contain it. In these cases we can avoid the shift
4423 implicit in bitfield extractions.
4425 For constants, we emit a compare of the shifted constant with the
4426 BIT_AND_EXPR of a mask and a byte, halfword, or word of the operand being
4427 compared. For two fields at the same position, we do the ANDs with the
4428 similar mask and compare the result of the ANDs.
4430 CODE is the comparison code, known to be either NE_EXPR or EQ_EXPR.
4431 COMPARE_TYPE is the type of the comparison, and LHS and RHS
4432 are the left and right operands of the comparison, respectively.
4434 If the optimization described above can be done, we return the resulting
4435 tree. Otherwise we return zero. */
4438 optimize_bit_field_compare (location_t loc
, enum tree_code code
,
4439 tree compare_type
, tree lhs
, tree rhs
)
4441 poly_int64 plbitpos
, plbitsize
, rbitpos
, rbitsize
;
4442 HOST_WIDE_INT lbitpos
, lbitsize
, nbitpos
, nbitsize
;
4443 tree type
= TREE_TYPE (lhs
);
4445 int const_p
= TREE_CODE (rhs
) == INTEGER_CST
;
4446 machine_mode lmode
, rmode
;
4447 scalar_int_mode nmode
;
4448 int lunsignedp
, runsignedp
;
4449 int lreversep
, rreversep
;
4450 int lvolatilep
= 0, rvolatilep
= 0;
4451 tree linner
, rinner
= NULL_TREE
;
4455 /* Get all the information about the extractions being done. If the bit size
4456 is the same as the size of the underlying object, we aren't doing an
4457 extraction at all and so can do nothing. We also don't want to
4458 do anything if the inner expression is a PLACEHOLDER_EXPR since we
4459 then will no longer be able to replace it. */
4460 linner
= get_inner_reference (lhs
, &plbitsize
, &plbitpos
, &offset
, &lmode
,
4461 &lunsignedp
, &lreversep
, &lvolatilep
);
4463 || !known_size_p (plbitsize
)
4464 || !plbitsize
.is_constant (&lbitsize
)
4465 || !plbitpos
.is_constant (&lbitpos
)
4466 || known_eq (lbitsize
, GET_MODE_BITSIZE (lmode
))
4468 || TREE_CODE (linner
) == PLACEHOLDER_EXPR
4473 rreversep
= lreversep
;
4476 /* If this is not a constant, we can only do something if bit positions,
4477 sizes, signedness and storage order are the same. */
4479 = get_inner_reference (rhs
, &rbitsize
, &rbitpos
, &offset
, &rmode
,
4480 &runsignedp
, &rreversep
, &rvolatilep
);
4483 || maybe_ne (lbitpos
, rbitpos
)
4484 || maybe_ne (lbitsize
, rbitsize
)
4485 || lunsignedp
!= runsignedp
4486 || lreversep
!= rreversep
4488 || TREE_CODE (rinner
) == PLACEHOLDER_EXPR
4493 /* Honor the C++ memory model and mimic what RTL expansion does. */
4494 poly_uint64 bitstart
= 0;
4495 poly_uint64 bitend
= 0;
4496 if (TREE_CODE (lhs
) == COMPONENT_REF
)
4498 get_bit_range (&bitstart
, &bitend
, lhs
, &plbitpos
, &offset
);
4499 if (!plbitpos
.is_constant (&lbitpos
) || offset
!= NULL_TREE
)
4503 /* See if we can find a mode to refer to this field. We should be able to,
4504 but fail if we can't. */
4505 if (!get_best_mode (lbitsize
, lbitpos
, bitstart
, bitend
,
4506 const_p
? TYPE_ALIGN (TREE_TYPE (linner
))
4507 : MIN (TYPE_ALIGN (TREE_TYPE (linner
)),
4508 TYPE_ALIGN (TREE_TYPE (rinner
))),
4509 BITS_PER_WORD
, false, &nmode
))
4512 /* Set signed and unsigned types of the precision of this mode for the
4514 unsigned_type
= lang_hooks
.types
.type_for_mode (nmode
, 1);
4516 /* Compute the bit position and size for the new reference and our offset
4517 within it. If the new reference is the same size as the original, we
4518 won't optimize anything, so return zero. */
4519 nbitsize
= GET_MODE_BITSIZE (nmode
);
4520 nbitpos
= lbitpos
& ~ (nbitsize
- 1);
4522 if (nbitsize
== lbitsize
)
4525 if (lreversep
? !BYTES_BIG_ENDIAN
: BYTES_BIG_ENDIAN
)
4526 lbitpos
= nbitsize
- lbitsize
- lbitpos
;
4528 /* Make the mask to be used against the extracted field. */
4529 mask
= build_int_cst_type (unsigned_type
, -1);
4530 mask
= const_binop (LSHIFT_EXPR
, mask
, size_int (nbitsize
- lbitsize
));
4531 mask
= const_binop (RSHIFT_EXPR
, mask
,
4532 size_int (nbitsize
- lbitsize
- lbitpos
));
4539 /* If not comparing with constant, just rework the comparison
4541 tree t1
= make_bit_field_ref (loc
, linner
, lhs
, unsigned_type
,
4542 nbitsize
, nbitpos
, 1, lreversep
);
4543 t1
= fold_build2_loc (loc
, BIT_AND_EXPR
, unsigned_type
, t1
, mask
);
4544 tree t2
= make_bit_field_ref (loc
, rinner
, rhs
, unsigned_type
,
4545 nbitsize
, nbitpos
, 1, rreversep
);
4546 t2
= fold_build2_loc (loc
, BIT_AND_EXPR
, unsigned_type
, t2
, mask
);
4547 return fold_build2_loc (loc
, code
, compare_type
, t1
, t2
);
4550 /* Otherwise, we are handling the constant case. See if the constant is too
4551 big for the field. Warn and return a tree for 0 (false) if so. We do
4552 this not only for its own sake, but to avoid having to test for this
4553 error case below. If we didn't, we might generate wrong code.
4555 For unsigned fields, the constant shifted right by the field length should
4556 be all zero. For signed fields, the high-order bits should agree with
4561 if (wi::lrshift (wi::to_wide (rhs
), lbitsize
) != 0)
4563 warning (0, "comparison is always %d due to width of bit-field",
4565 return constant_boolean_node (code
== NE_EXPR
, compare_type
);
4570 wide_int tem
= wi::arshift (wi::to_wide (rhs
), lbitsize
- 1);
4571 if (tem
!= 0 && tem
!= -1)
4573 warning (0, "comparison is always %d due to width of bit-field",
4575 return constant_boolean_node (code
== NE_EXPR
, compare_type
);
4582 /* Single-bit compares should always be against zero. */
4583 if (lbitsize
== 1 && ! integer_zerop (rhs
))
4585 code
= code
== EQ_EXPR
? NE_EXPR
: EQ_EXPR
;
4586 rhs
= build_int_cst (type
, 0);
4589 /* Make a new bitfield reference, shift the constant over the
4590 appropriate number of bits and mask it with the computed mask
4591 (in case this was a signed field). If we changed it, make a new one. */
4592 lhs
= make_bit_field_ref (loc
, linner
, lhs
, unsigned_type
,
4593 nbitsize
, nbitpos
, 1, lreversep
);
4595 rhs
= const_binop (BIT_AND_EXPR
,
4596 const_binop (LSHIFT_EXPR
,
4597 fold_convert_loc (loc
, unsigned_type
, rhs
),
4598 size_int (lbitpos
)),
4601 lhs
= build2_loc (loc
, code
, compare_type
,
4602 build2 (BIT_AND_EXPR
, unsigned_type
, lhs
, mask
), rhs
);
4606 /* Subroutine for fold_truth_andor_1: decode a field reference.
4608 If EXP is a comparison reference, we return the innermost reference.
4610 *PBITSIZE is set to the number of bits in the reference, *PBITPOS is
4611 set to the starting bit number.
4613 If the innermost field can be completely contained in a mode-sized
4614 unit, *PMODE is set to that mode. Otherwise, it is set to VOIDmode.
4616 *PVOLATILEP is set to 1 if the any expression encountered is volatile;
4617 otherwise it is not changed.
4619 *PUNSIGNEDP is set to the signedness of the field.
4621 *PREVERSEP is set to the storage order of the field.
4623 *PMASK is set to the mask used. This is either contained in a
4624 BIT_AND_EXPR or derived from the width of the field.
4626 *PAND_MASK is set to the mask found in a BIT_AND_EXPR, if any.
4628 Return 0 if this is not a component reference or is one that we can't
4629 do anything with. */
4632 decode_field_reference (location_t loc
, tree
*exp_
, HOST_WIDE_INT
*pbitsize
,
4633 HOST_WIDE_INT
*pbitpos
, machine_mode
*pmode
,
4634 int *punsignedp
, int *preversep
, int *pvolatilep
,
4635 tree
*pmask
, tree
*pand_mask
)
4638 tree outer_type
= 0;
4640 tree mask
, inner
, offset
;
4642 unsigned int precision
;
4644 /* All the optimizations using this function assume integer fields.
4645 There are problems with FP fields since the type_for_size call
4646 below can fail for, e.g., XFmode. */
4647 if (! INTEGRAL_TYPE_P (TREE_TYPE (exp
)))
4650 /* We are interested in the bare arrangement of bits, so strip everything
4651 that doesn't affect the machine mode. However, record the type of the
4652 outermost expression if it may matter below. */
4653 if (CONVERT_EXPR_P (exp
)
4654 || TREE_CODE (exp
) == NON_LVALUE_EXPR
)
4655 outer_type
= TREE_TYPE (exp
);
4658 if (TREE_CODE (exp
) == BIT_AND_EXPR
)
4660 and_mask
= TREE_OPERAND (exp
, 1);
4661 exp
= TREE_OPERAND (exp
, 0);
4662 STRIP_NOPS (exp
); STRIP_NOPS (and_mask
);
4663 if (TREE_CODE (and_mask
) != INTEGER_CST
)
4667 poly_int64 poly_bitsize
, poly_bitpos
;
4668 inner
= get_inner_reference (exp
, &poly_bitsize
, &poly_bitpos
, &offset
,
4669 pmode
, punsignedp
, preversep
, pvolatilep
);
4670 if ((inner
== exp
&& and_mask
== 0)
4671 || !poly_bitsize
.is_constant (pbitsize
)
4672 || !poly_bitpos
.is_constant (pbitpos
)
4675 || TREE_CODE (inner
) == PLACEHOLDER_EXPR
4676 /* Reject out-of-bound accesses (PR79731). */
4677 || (! AGGREGATE_TYPE_P (TREE_TYPE (inner
))
4678 && compare_tree_int (TYPE_SIZE (TREE_TYPE (inner
)),
4679 *pbitpos
+ *pbitsize
) < 0))
4682 unsigned_type
= lang_hooks
.types
.type_for_size (*pbitsize
, 1);
4683 if (unsigned_type
== NULL_TREE
)
4688 /* If the number of bits in the reference is the same as the bitsize of
4689 the outer type, then the outer type gives the signedness. Otherwise
4690 (in case of a small bitfield) the signedness is unchanged. */
4691 if (outer_type
&& *pbitsize
== TYPE_PRECISION (outer_type
))
4692 *punsignedp
= TYPE_UNSIGNED (outer_type
);
4694 /* Compute the mask to access the bitfield. */
4695 precision
= TYPE_PRECISION (unsigned_type
);
4697 mask
= build_int_cst_type (unsigned_type
, -1);
4699 mask
= const_binop (LSHIFT_EXPR
, mask
, size_int (precision
- *pbitsize
));
4700 mask
= const_binop (RSHIFT_EXPR
, mask
, size_int (precision
- *pbitsize
));
4702 /* Merge it with the mask we found in the BIT_AND_EXPR, if any. */
4704 mask
= fold_build2_loc (loc
, BIT_AND_EXPR
, unsigned_type
,
4705 fold_convert_loc (loc
, unsigned_type
, and_mask
), mask
);
4708 *pand_mask
= and_mask
;
4712 /* Return nonzero if MASK represents a mask of SIZE ones in the low-order
4713 bit positions and MASK is SIGNED. */
4716 all_ones_mask_p (const_tree mask
, unsigned int size
)
4718 tree type
= TREE_TYPE (mask
);
4719 unsigned int precision
= TYPE_PRECISION (type
);
4721 /* If this function returns true when the type of the mask is
4722 UNSIGNED, then there will be errors. In particular see
4723 gcc.c-torture/execute/990326-1.c. There does not appear to be
4724 any documentation paper trail as to why this is so. But the pre
4725 wide-int worked with that restriction and it has been preserved
4727 if (size
> precision
|| TYPE_SIGN (type
) == UNSIGNED
)
4730 return wi::mask (size
, false, precision
) == wi::to_wide (mask
);
4733 /* Subroutine for fold: determine if VAL is the INTEGER_CONST that
4734 represents the sign bit of EXP's type. If EXP represents a sign
4735 or zero extension, also test VAL against the unextended type.
4736 The return value is the (sub)expression whose sign bit is VAL,
4737 or NULL_TREE otherwise. */
4740 sign_bit_p (tree exp
, const_tree val
)
4745 /* Tree EXP must have an integral type. */
4746 t
= TREE_TYPE (exp
);
4747 if (! INTEGRAL_TYPE_P (t
))
4750 /* Tree VAL must be an integer constant. */
4751 if (TREE_CODE (val
) != INTEGER_CST
4752 || TREE_OVERFLOW (val
))
4755 width
= TYPE_PRECISION (t
);
4756 if (wi::only_sign_bit_p (wi::to_wide (val
), width
))
4759 /* Handle extension from a narrower type. */
4760 if (TREE_CODE (exp
) == NOP_EXPR
4761 && TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (exp
, 0))) < width
)
4762 return sign_bit_p (TREE_OPERAND (exp
, 0), val
);
4767 /* Subroutine for fold_truth_andor_1: determine if an operand is simple enough
4768 to be evaluated unconditionally. */
4771 simple_operand_p (const_tree exp
)
4773 /* Strip any conversions that don't change the machine mode. */
4776 return (CONSTANT_CLASS_P (exp
)
4777 || TREE_CODE (exp
) == SSA_NAME
4779 && ! TREE_ADDRESSABLE (exp
)
4780 && ! TREE_THIS_VOLATILE (exp
)
4781 && ! DECL_NONLOCAL (exp
)
4782 /* Don't regard global variables as simple. They may be
4783 allocated in ways unknown to the compiler (shared memory,
4784 #pragma weak, etc). */
4785 && ! TREE_PUBLIC (exp
)
4786 && ! DECL_EXTERNAL (exp
)
4787 /* Weakrefs are not safe to be read, since they can be NULL.
4788 They are !TREE_PUBLIC && !DECL_EXTERNAL but still
4789 have DECL_WEAK flag set. */
4790 && (! VAR_OR_FUNCTION_DECL_P (exp
) || ! DECL_WEAK (exp
))
4791 /* Loading a static variable is unduly expensive, but global
4792 registers aren't expensive. */
4793 && (! TREE_STATIC (exp
) || DECL_REGISTER (exp
))));
4796 /* Subroutine for fold_truth_andor: determine if an operand is simple enough
4797 to be evaluated unconditionally.
4798 I addition to simple_operand_p, we assume that comparisons, conversions,
4799 and logic-not operations are simple, if their operands are simple, too. */
4802 simple_operand_p_2 (tree exp
)
4804 enum tree_code code
;
4806 if (TREE_SIDE_EFFECTS (exp
) || generic_expr_could_trap_p (exp
))
4809 while (CONVERT_EXPR_P (exp
))
4810 exp
= TREE_OPERAND (exp
, 0);
4812 code
= TREE_CODE (exp
);
4814 if (TREE_CODE_CLASS (code
) == tcc_comparison
)
4815 return (simple_operand_p (TREE_OPERAND (exp
, 0))
4816 && simple_operand_p (TREE_OPERAND (exp
, 1)));
4818 if (code
== TRUTH_NOT_EXPR
)
4819 return simple_operand_p_2 (TREE_OPERAND (exp
, 0));
4821 return simple_operand_p (exp
);
4825 /* The following functions are subroutines to fold_range_test and allow it to
4826 try to change a logical combination of comparisons into a range test.
4829 X == 2 || X == 3 || X == 4 || X == 5
4833 (unsigned) (X - 2) <= 3
4835 We describe each set of comparisons as being either inside or outside
4836 a range, using a variable named like IN_P, and then describe the
4837 range with a lower and upper bound. If one of the bounds is omitted,
4838 it represents either the highest or lowest value of the type.
4840 In the comments below, we represent a range by two numbers in brackets
4841 preceded by a "+" to designate being inside that range, or a "-" to
4842 designate being outside that range, so the condition can be inverted by
4843 flipping the prefix. An omitted bound is represented by a "-". For
4844 example, "- [-, 10]" means being outside the range starting at the lowest
4845 possible value and ending at 10, in other words, being greater than 10.
4846 The range "+ [-, -]" is always true and hence the range "- [-, -]" is
4849 We set up things so that the missing bounds are handled in a consistent
4850 manner so neither a missing bound nor "true" and "false" need to be
4851 handled using a special case. */
4853 /* Return the result of applying CODE to ARG0 and ARG1, but handle the case
4854 of ARG0 and/or ARG1 being omitted, meaning an unlimited range. UPPER0_P
4855 and UPPER1_P are nonzero if the respective argument is an upper bound
4856 and zero for a lower. TYPE, if nonzero, is the type of the result; it
4857 must be specified for a comparison. ARG1 will be converted to ARG0's
4858 type if both are specified. */
4861 range_binop (enum tree_code code
, tree type
, tree arg0
, int upper0_p
,
4862 tree arg1
, int upper1_p
)
4868 /* If neither arg represents infinity, do the normal operation.
4869 Else, if not a comparison, return infinity. Else handle the special
4870 comparison rules. Note that most of the cases below won't occur, but
4871 are handled for consistency. */
4873 if (arg0
!= 0 && arg1
!= 0)
4875 tem
= fold_build2 (code
, type
!= 0 ? type
: TREE_TYPE (arg0
),
4876 arg0
, fold_convert (TREE_TYPE (arg0
), arg1
));
4878 return TREE_CODE (tem
) == INTEGER_CST
? tem
: 0;
4881 if (TREE_CODE_CLASS (code
) != tcc_comparison
)
4884 /* Set SGN[01] to -1 if ARG[01] is a lower bound, 1 for upper, and 0
4885 for neither. In real maths, we cannot assume open ended ranges are
4886 the same. But, this is computer arithmetic, where numbers are finite.
4887 We can therefore make the transformation of any unbounded range with
4888 the value Z, Z being greater than any representable number. This permits
4889 us to treat unbounded ranges as equal. */
4890 sgn0
= arg0
!= 0 ? 0 : (upper0_p
? 1 : -1);
4891 sgn1
= arg1
!= 0 ? 0 : (upper1_p
? 1 : -1);
4895 result
= sgn0
== sgn1
;
4898 result
= sgn0
!= sgn1
;
4901 result
= sgn0
< sgn1
;
4904 result
= sgn0
<= sgn1
;
4907 result
= sgn0
> sgn1
;
4910 result
= sgn0
>= sgn1
;
4916 return constant_boolean_node (result
, type
);
4919 /* Helper routine for make_range. Perform one step for it, return
4920 new expression if the loop should continue or NULL_TREE if it should
4924 make_range_step (location_t loc
, enum tree_code code
, tree arg0
, tree arg1
,
4925 tree exp_type
, tree
*p_low
, tree
*p_high
, int *p_in_p
,
4926 bool *strict_overflow_p
)
4928 tree arg0_type
= TREE_TYPE (arg0
);
4929 tree n_low
, n_high
, low
= *p_low
, high
= *p_high
;
4930 int in_p
= *p_in_p
, n_in_p
;
4934 case TRUTH_NOT_EXPR
:
4935 /* We can only do something if the range is testing for zero. */
4936 if (low
== NULL_TREE
|| high
== NULL_TREE
4937 || ! integer_zerop (low
) || ! integer_zerop (high
))
4942 case EQ_EXPR
: case NE_EXPR
:
4943 case LT_EXPR
: case LE_EXPR
: case GE_EXPR
: case GT_EXPR
:
4944 /* We can only do something if the range is testing for zero
4945 and if the second operand is an integer constant. Note that
4946 saying something is "in" the range we make is done by
4947 complementing IN_P since it will set in the initial case of
4948 being not equal to zero; "out" is leaving it alone. */
4949 if (low
== NULL_TREE
|| high
== NULL_TREE
4950 || ! integer_zerop (low
) || ! integer_zerop (high
)
4951 || TREE_CODE (arg1
) != INTEGER_CST
)
4956 case NE_EXPR
: /* - [c, c] */
4959 case EQ_EXPR
: /* + [c, c] */
4960 in_p
= ! in_p
, low
= high
= arg1
;
4962 case GT_EXPR
: /* - [-, c] */
4963 low
= 0, high
= arg1
;
4965 case GE_EXPR
: /* + [c, -] */
4966 in_p
= ! in_p
, low
= arg1
, high
= 0;
4968 case LT_EXPR
: /* - [c, -] */
4969 low
= arg1
, high
= 0;
4971 case LE_EXPR
: /* + [-, c] */
4972 in_p
= ! in_p
, low
= 0, high
= arg1
;
4978 /* If this is an unsigned comparison, we also know that EXP is
4979 greater than or equal to zero. We base the range tests we make
4980 on that fact, so we record it here so we can parse existing
4981 range tests. We test arg0_type since often the return type
4982 of, e.g. EQ_EXPR, is boolean. */
4983 if (TYPE_UNSIGNED (arg0_type
) && (low
== 0 || high
== 0))
4985 if (! merge_ranges (&n_in_p
, &n_low
, &n_high
,
4987 build_int_cst (arg0_type
, 0),
4991 in_p
= n_in_p
, low
= n_low
, high
= n_high
;
4993 /* If the high bound is missing, but we have a nonzero low
4994 bound, reverse the range so it goes from zero to the low bound
4996 if (high
== 0 && low
&& ! integer_zerop (low
))
4999 high
= range_binop (MINUS_EXPR
, NULL_TREE
, low
, 0,
5000 build_int_cst (TREE_TYPE (low
), 1), 0);
5001 low
= build_int_cst (arg0_type
, 0);
5011 /* If flag_wrapv and ARG0_TYPE is signed, make sure
5012 low and high are non-NULL, then normalize will DTRT. */
5013 if (!TYPE_UNSIGNED (arg0_type
)
5014 && !TYPE_OVERFLOW_UNDEFINED (arg0_type
))
5016 if (low
== NULL_TREE
)
5017 low
= TYPE_MIN_VALUE (arg0_type
);
5018 if (high
== NULL_TREE
)
5019 high
= TYPE_MAX_VALUE (arg0_type
);
5022 /* (-x) IN [a,b] -> x in [-b, -a] */
5023 n_low
= range_binop (MINUS_EXPR
, exp_type
,
5024 build_int_cst (exp_type
, 0),
5026 n_high
= range_binop (MINUS_EXPR
, exp_type
,
5027 build_int_cst (exp_type
, 0),
5029 if (n_high
!= 0 && TREE_OVERFLOW (n_high
))
5035 return build2_loc (loc
, MINUS_EXPR
, exp_type
, negate_expr (arg0
),
5036 build_int_cst (exp_type
, 1));
5040 if (TREE_CODE (arg1
) != INTEGER_CST
)
5043 /* If flag_wrapv and ARG0_TYPE is signed, then we cannot
5044 move a constant to the other side. */
5045 if (!TYPE_UNSIGNED (arg0_type
)
5046 && !TYPE_OVERFLOW_UNDEFINED (arg0_type
))
5049 /* If EXP is signed, any overflow in the computation is undefined,
5050 so we don't worry about it so long as our computations on
5051 the bounds don't overflow. For unsigned, overflow is defined
5052 and this is exactly the right thing. */
5053 n_low
= range_binop (code
== MINUS_EXPR
? PLUS_EXPR
: MINUS_EXPR
,
5054 arg0_type
, low
, 0, arg1
, 0);
5055 n_high
= range_binop (code
== MINUS_EXPR
? PLUS_EXPR
: MINUS_EXPR
,
5056 arg0_type
, high
, 1, arg1
, 0);
5057 if ((n_low
!= 0 && TREE_OVERFLOW (n_low
))
5058 || (n_high
!= 0 && TREE_OVERFLOW (n_high
)))
5061 if (TYPE_OVERFLOW_UNDEFINED (arg0_type
))
5062 *strict_overflow_p
= true;
5065 /* Check for an unsigned range which has wrapped around the maximum
5066 value thus making n_high < n_low, and normalize it. */
5067 if (n_low
&& n_high
&& tree_int_cst_lt (n_high
, n_low
))
5069 low
= range_binop (PLUS_EXPR
, arg0_type
, n_high
, 0,
5070 build_int_cst (TREE_TYPE (n_high
), 1), 0);
5071 high
= range_binop (MINUS_EXPR
, arg0_type
, n_low
, 0,
5072 build_int_cst (TREE_TYPE (n_low
), 1), 0);
5074 /* If the range is of the form +/- [ x+1, x ], we won't
5075 be able to normalize it. But then, it represents the
5076 whole range or the empty set, so make it
5078 if (tree_int_cst_equal (n_low
, low
)
5079 && tree_int_cst_equal (n_high
, high
))
5085 low
= n_low
, high
= n_high
;
5093 case NON_LVALUE_EXPR
:
5094 if (TYPE_PRECISION (arg0_type
) > TYPE_PRECISION (exp_type
))
5097 if (! INTEGRAL_TYPE_P (arg0_type
)
5098 || (low
!= 0 && ! int_fits_type_p (low
, arg0_type
))
5099 || (high
!= 0 && ! int_fits_type_p (high
, arg0_type
)))
5102 n_low
= low
, n_high
= high
;
5105 n_low
= fold_convert_loc (loc
, arg0_type
, n_low
);
5108 n_high
= fold_convert_loc (loc
, arg0_type
, n_high
);
5110 /* If we're converting arg0 from an unsigned type, to exp,
5111 a signed type, we will be doing the comparison as unsigned.
5112 The tests above have already verified that LOW and HIGH
5115 So we have to ensure that we will handle large unsigned
5116 values the same way that the current signed bounds treat
5119 if (!TYPE_UNSIGNED (exp_type
) && TYPE_UNSIGNED (arg0_type
))
5123 /* For fixed-point modes, we need to pass the saturating flag
5124 as the 2nd parameter. */
5125 if (ALL_FIXED_POINT_MODE_P (TYPE_MODE (arg0_type
)))
5127 = lang_hooks
.types
.type_for_mode (TYPE_MODE (arg0_type
),
5128 TYPE_SATURATING (arg0_type
));
5131 = lang_hooks
.types
.type_for_mode (TYPE_MODE (arg0_type
), 1);
5133 /* A range without an upper bound is, naturally, unbounded.
5134 Since convert would have cropped a very large value, use
5135 the max value for the destination type. */
5137 = TYPE_MAX_VALUE (equiv_type
) ? TYPE_MAX_VALUE (equiv_type
)
5138 : TYPE_MAX_VALUE (arg0_type
);
5140 if (TYPE_PRECISION (exp_type
) == TYPE_PRECISION (arg0_type
))
5141 high_positive
= fold_build2_loc (loc
, RSHIFT_EXPR
, arg0_type
,
5142 fold_convert_loc (loc
, arg0_type
,
5144 build_int_cst (arg0_type
, 1));
5146 /* If the low bound is specified, "and" the range with the
5147 range for which the original unsigned value will be
5151 if (! merge_ranges (&n_in_p
, &n_low
, &n_high
, 1, n_low
, n_high
,
5152 1, fold_convert_loc (loc
, arg0_type
,
5157 in_p
= (n_in_p
== in_p
);
5161 /* Otherwise, "or" the range with the range of the input
5162 that will be interpreted as negative. */
5163 if (! merge_ranges (&n_in_p
, &n_low
, &n_high
, 0, n_low
, n_high
,
5164 1, fold_convert_loc (loc
, arg0_type
,
5169 in_p
= (in_p
!= n_in_p
);
5183 /* Given EXP, a logical expression, set the range it is testing into
5184 variables denoted by PIN_P, PLOW, and PHIGH. Return the expression
5185 actually being tested. *PLOW and *PHIGH will be made of the same
5186 type as the returned expression. If EXP is not a comparison, we
5187 will most likely not be returning a useful value and range. Set
5188 *STRICT_OVERFLOW_P to true if the return value is only valid
5189 because signed overflow is undefined; otherwise, do not change
5190 *STRICT_OVERFLOW_P. */
5193 make_range (tree exp
, int *pin_p
, tree
*plow
, tree
*phigh
,
5194 bool *strict_overflow_p
)
5196 enum tree_code code
;
5197 tree arg0
, arg1
= NULL_TREE
;
5198 tree exp_type
, nexp
;
5201 location_t loc
= EXPR_LOCATION (exp
);
5203 /* Start with simply saying "EXP != 0" and then look at the code of EXP
5204 and see if we can refine the range. Some of the cases below may not
5205 happen, but it doesn't seem worth worrying about this. We "continue"
5206 the outer loop when we've changed something; otherwise we "break"
5207 the switch, which will "break" the while. */
5210 low
= high
= build_int_cst (TREE_TYPE (exp
), 0);
5214 code
= TREE_CODE (exp
);
5215 exp_type
= TREE_TYPE (exp
);
5218 if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (code
)))
5220 if (TREE_OPERAND_LENGTH (exp
) > 0)
5221 arg0
= TREE_OPERAND (exp
, 0);
5222 if (TREE_CODE_CLASS (code
) == tcc_binary
5223 || TREE_CODE_CLASS (code
) == tcc_comparison
5224 || (TREE_CODE_CLASS (code
) == tcc_expression
5225 && TREE_OPERAND_LENGTH (exp
) > 1))
5226 arg1
= TREE_OPERAND (exp
, 1);
5228 if (arg0
== NULL_TREE
)
5231 nexp
= make_range_step (loc
, code
, arg0
, arg1
, exp_type
, &low
,
5232 &high
, &in_p
, strict_overflow_p
);
5233 if (nexp
== NULL_TREE
)
5238 /* If EXP is a constant, we can evaluate whether this is true or false. */
5239 if (TREE_CODE (exp
) == INTEGER_CST
)
5241 in_p
= in_p
== (integer_onep (range_binop (GE_EXPR
, integer_type_node
,
5243 && integer_onep (range_binop (LE_EXPR
, integer_type_node
,
5249 *pin_p
= in_p
, *plow
= low
, *phigh
= high
;
5253 /* Returns TRUE if [LOW, HIGH] range check can be optimized to
5254 a bitwise check i.e. when
5255 LOW == 0xXX...X00...0
5256 HIGH == 0xXX...X11...1
5257 Return corresponding mask in MASK and stem in VALUE. */
5260 maskable_range_p (const_tree low
, const_tree high
, tree type
, tree
*mask
,
5263 if (TREE_CODE (low
) != INTEGER_CST
5264 || TREE_CODE (high
) != INTEGER_CST
)
5267 unsigned prec
= TYPE_PRECISION (type
);
5268 wide_int lo
= wi::to_wide (low
, prec
);
5269 wide_int hi
= wi::to_wide (high
, prec
);
5271 wide_int end_mask
= lo
^ hi
;
5272 if ((end_mask
& (end_mask
+ 1)) != 0
5273 || (lo
& end_mask
) != 0)
5276 wide_int stem_mask
= ~end_mask
;
5277 wide_int stem
= lo
& stem_mask
;
5278 if (stem
!= (hi
& stem_mask
))
5281 *mask
= wide_int_to_tree (type
, stem_mask
);
5282 *value
= wide_int_to_tree (type
, stem
);
5287 /* Helper routine for build_range_check and match.pd. Return the type to
5288 perform the check or NULL if it shouldn't be optimized. */
5291 range_check_type (tree etype
)
5293 /* First make sure that arithmetics in this type is valid, then make sure
5294 that it wraps around. */
5295 if (TREE_CODE (etype
) == ENUMERAL_TYPE
|| TREE_CODE (etype
) == BOOLEAN_TYPE
)
5296 etype
= lang_hooks
.types
.type_for_size (TYPE_PRECISION (etype
), 1);
5298 if (TREE_CODE (etype
) == INTEGER_TYPE
&& !TYPE_UNSIGNED (etype
))
5300 tree utype
, minv
, maxv
;
5302 /* Check if (unsigned) INT_MAX + 1 == (unsigned) INT_MIN
5303 for the type in question, as we rely on this here. */
5304 utype
= unsigned_type_for (etype
);
5305 maxv
= fold_convert (utype
, TYPE_MAX_VALUE (etype
));
5306 maxv
= range_binop (PLUS_EXPR
, NULL_TREE
, maxv
, 1,
5307 build_int_cst (TREE_TYPE (maxv
), 1), 1);
5308 minv
= fold_convert (utype
, TYPE_MIN_VALUE (etype
));
5310 if (integer_zerop (range_binop (NE_EXPR
, integer_type_node
,
5316 else if (POINTER_TYPE_P (etype
))
5317 etype
= unsigned_type_for (etype
);
5321 /* Given a range, LOW, HIGH, and IN_P, an expression, EXP, and a result
5322 type, TYPE, return an expression to test if EXP is in (or out of, depending
5323 on IN_P) the range. Return 0 if the test couldn't be created. */
5326 build_range_check (location_t loc
, tree type
, tree exp
, int in_p
,
5327 tree low
, tree high
)
5329 tree etype
= TREE_TYPE (exp
), mask
, value
;
5331 /* Disable this optimization for function pointer expressions
5332 on targets that require function pointer canonicalization. */
5333 if (targetm
.have_canonicalize_funcptr_for_compare ()
5334 && POINTER_TYPE_P (etype
)
5335 && FUNC_OR_METHOD_TYPE_P (TREE_TYPE (etype
)))
5340 value
= build_range_check (loc
, type
, exp
, 1, low
, high
);
5342 return invert_truthvalue_loc (loc
, value
);
5347 if (low
== 0 && high
== 0)
5348 return omit_one_operand_loc (loc
, type
, build_int_cst (type
, 1), exp
);
5351 return fold_build2_loc (loc
, LE_EXPR
, type
, exp
,
5352 fold_convert_loc (loc
, etype
, high
));
5355 return fold_build2_loc (loc
, GE_EXPR
, type
, exp
,
5356 fold_convert_loc (loc
, etype
, low
));
5358 if (operand_equal_p (low
, high
, 0))
5359 return fold_build2_loc (loc
, EQ_EXPR
, type
, exp
,
5360 fold_convert_loc (loc
, etype
, low
));
5362 if (TREE_CODE (exp
) == BIT_AND_EXPR
5363 && maskable_range_p (low
, high
, etype
, &mask
, &value
))
5364 return fold_build2_loc (loc
, EQ_EXPR
, type
,
5365 fold_build2_loc (loc
, BIT_AND_EXPR
, etype
,
5369 if (integer_zerop (low
))
5371 if (! TYPE_UNSIGNED (etype
))
5373 etype
= unsigned_type_for (etype
);
5374 high
= fold_convert_loc (loc
, etype
, high
);
5375 exp
= fold_convert_loc (loc
, etype
, exp
);
5377 return build_range_check (loc
, type
, exp
, 1, 0, high
);
5380 /* Optimize (c>=1) && (c<=127) into (signed char)c > 0. */
5381 if (integer_onep (low
) && TREE_CODE (high
) == INTEGER_CST
)
5383 int prec
= TYPE_PRECISION (etype
);
5385 if (wi::mask
<widest_int
> (prec
- 1, false) == wi::to_widest (high
))
5387 if (TYPE_UNSIGNED (etype
))
5389 tree signed_etype
= signed_type_for (etype
);
5390 if (TYPE_PRECISION (signed_etype
) != TYPE_PRECISION (etype
))
5392 = build_nonstandard_integer_type (TYPE_PRECISION (etype
), 0);
5394 etype
= signed_etype
;
5395 exp
= fold_convert_loc (loc
, etype
, exp
);
5397 return fold_build2_loc (loc
, GT_EXPR
, type
, exp
,
5398 build_int_cst (etype
, 0));
5402 /* Optimize (c>=low) && (c<=high) into (c-low>=0) && (c-low<=high-low).
5403 This requires wrap-around arithmetics for the type of the expression. */
5404 etype
= range_check_type (etype
);
5405 if (etype
== NULL_TREE
)
5408 high
= fold_convert_loc (loc
, etype
, high
);
5409 low
= fold_convert_loc (loc
, etype
, low
);
5410 exp
= fold_convert_loc (loc
, etype
, exp
);
5412 value
= const_binop (MINUS_EXPR
, high
, low
);
5414 if (value
!= 0 && !TREE_OVERFLOW (value
))
5415 return build_range_check (loc
, type
,
5416 fold_build2_loc (loc
, MINUS_EXPR
, etype
, exp
, low
),
5417 1, build_int_cst (etype
, 0), value
);
5422 /* Return the predecessor of VAL in its type, handling the infinite case. */
5425 range_predecessor (tree val
)
5427 tree type
= TREE_TYPE (val
);
5429 if (INTEGRAL_TYPE_P (type
)
5430 && operand_equal_p (val
, TYPE_MIN_VALUE (type
), 0))
5433 return range_binop (MINUS_EXPR
, NULL_TREE
, val
, 0,
5434 build_int_cst (TREE_TYPE (val
), 1), 0);
5437 /* Return the successor of VAL in its type, handling the infinite case. */
5440 range_successor (tree val
)
5442 tree type
= TREE_TYPE (val
);
5444 if (INTEGRAL_TYPE_P (type
)
5445 && operand_equal_p (val
, TYPE_MAX_VALUE (type
), 0))
5448 return range_binop (PLUS_EXPR
, NULL_TREE
, val
, 0,
5449 build_int_cst (TREE_TYPE (val
), 1), 0);
5452 /* Given two ranges, see if we can merge them into one. Return 1 if we
5453 can, 0 if we can't. Set the output range into the specified parameters. */
5456 merge_ranges (int *pin_p
, tree
*plow
, tree
*phigh
, int in0_p
, tree low0
,
5457 tree high0
, int in1_p
, tree low1
, tree high1
)
5465 int lowequal
= ((low0
== 0 && low1
== 0)
5466 || integer_onep (range_binop (EQ_EXPR
, integer_type_node
,
5467 low0
, 0, low1
, 0)));
5468 int highequal
= ((high0
== 0 && high1
== 0)
5469 || integer_onep (range_binop (EQ_EXPR
, integer_type_node
,
5470 high0
, 1, high1
, 1)));
5472 /* Make range 0 be the range that starts first, or ends last if they
5473 start at the same value. Swap them if it isn't. */
5474 if (integer_onep (range_binop (GT_EXPR
, integer_type_node
,
5477 && integer_onep (range_binop (GT_EXPR
, integer_type_node
,
5478 high1
, 1, high0
, 1))))
5480 temp
= in0_p
, in0_p
= in1_p
, in1_p
= temp
;
5481 tem
= low0
, low0
= low1
, low1
= tem
;
5482 tem
= high0
, high0
= high1
, high1
= tem
;
5485 /* If the second range is != high1 where high1 is the type maximum of
5486 the type, try first merging with < high1 range. */
5489 && TREE_CODE (low1
) == INTEGER_CST
5490 && (TREE_CODE (TREE_TYPE (low1
)) == INTEGER_TYPE
5491 || (TREE_CODE (TREE_TYPE (low1
)) == ENUMERAL_TYPE
5492 && known_eq (TYPE_PRECISION (TREE_TYPE (low1
)),
5493 GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (low1
))))))
5494 && operand_equal_p (low1
, high1
, 0))
5496 if (tree_int_cst_equal (low1
, TYPE_MAX_VALUE (TREE_TYPE (low1
)))
5497 && merge_ranges (pin_p
, plow
, phigh
, in0_p
, low0
, high0
,
5498 !in1_p
, NULL_TREE
, range_predecessor (low1
)))
5500 /* Similarly for the second range != low1 where low1 is the type minimum
5501 of the type, try first merging with > low1 range. */
5502 if (tree_int_cst_equal (low1
, TYPE_MIN_VALUE (TREE_TYPE (low1
)))
5503 && merge_ranges (pin_p
, plow
, phigh
, in0_p
, low0
, high0
,
5504 !in1_p
, range_successor (low1
), NULL_TREE
))
5508 /* Now flag two cases, whether the ranges are disjoint or whether the
5509 second range is totally subsumed in the first. Note that the tests
5510 below are simplified by the ones above. */
5511 no_overlap
= integer_onep (range_binop (LT_EXPR
, integer_type_node
,
5512 high0
, 1, low1
, 0));
5513 subset
= integer_onep (range_binop (LE_EXPR
, integer_type_node
,
5514 high1
, 1, high0
, 1));
5516 /* We now have four cases, depending on whether we are including or
5517 excluding the two ranges. */
5520 /* If they don't overlap, the result is false. If the second range
5521 is a subset it is the result. Otherwise, the range is from the start
5522 of the second to the end of the first. */
5524 in_p
= 0, low
= high
= 0;
5526 in_p
= 1, low
= low1
, high
= high1
;
5528 in_p
= 1, low
= low1
, high
= high0
;
5531 else if (in0_p
&& ! in1_p
)
5533 /* If they don't overlap, the result is the first range. If they are
5534 equal, the result is false. If the second range is a subset of the
5535 first, and the ranges begin at the same place, we go from just after
5536 the end of the second range to the end of the first. If the second
5537 range is not a subset of the first, or if it is a subset and both
5538 ranges end at the same place, the range starts at the start of the
5539 first range and ends just before the second range.
5540 Otherwise, we can't describe this as a single range. */
5542 in_p
= 1, low
= low0
, high
= high0
;
5543 else if (lowequal
&& highequal
)
5544 in_p
= 0, low
= high
= 0;
5545 else if (subset
&& lowequal
)
5547 low
= range_successor (high1
);
5552 /* We are in the weird situation where high0 > high1 but
5553 high1 has no successor. Punt. */
5557 else if (! subset
|| highequal
)
5560 high
= range_predecessor (low1
);
5564 /* low0 < low1 but low1 has no predecessor. Punt. */
5572 else if (! in0_p
&& in1_p
)
5574 /* If they don't overlap, the result is the second range. If the second
5575 is a subset of the first, the result is false. Otherwise,
5576 the range starts just after the first range and ends at the
5577 end of the second. */
5579 in_p
= 1, low
= low1
, high
= high1
;
5580 else if (subset
|| highequal
)
5581 in_p
= 0, low
= high
= 0;
5584 low
= range_successor (high0
);
5589 /* high1 > high0 but high0 has no successor. Punt. */
5597 /* The case where we are excluding both ranges. Here the complex case
5598 is if they don't overlap. In that case, the only time we have a
5599 range is if they are adjacent. If the second is a subset of the
5600 first, the result is the first. Otherwise, the range to exclude
5601 starts at the beginning of the first range and ends at the end of the
5605 if (integer_onep (range_binop (EQ_EXPR
, integer_type_node
,
5606 range_successor (high0
),
5608 in_p
= 0, low
= low0
, high
= high1
;
5611 /* Canonicalize - [min, x] into - [-, x]. */
5612 if (low0
&& TREE_CODE (low0
) == INTEGER_CST
)
5613 switch (TREE_CODE (TREE_TYPE (low0
)))
5616 if (maybe_ne (TYPE_PRECISION (TREE_TYPE (low0
)),
5618 (TYPE_MODE (TREE_TYPE (low0
)))))
5622 if (tree_int_cst_equal (low0
,
5623 TYPE_MIN_VALUE (TREE_TYPE (low0
))))
5627 if (TYPE_UNSIGNED (TREE_TYPE (low0
))
5628 && integer_zerop (low0
))
5635 /* Canonicalize - [x, max] into - [x, -]. */
5636 if (high1
&& TREE_CODE (high1
) == INTEGER_CST
)
5637 switch (TREE_CODE (TREE_TYPE (high1
)))
5640 if (maybe_ne (TYPE_PRECISION (TREE_TYPE (high1
)),
5642 (TYPE_MODE (TREE_TYPE (high1
)))))
5646 if (tree_int_cst_equal (high1
,
5647 TYPE_MAX_VALUE (TREE_TYPE (high1
))))
5651 if (TYPE_UNSIGNED (TREE_TYPE (high1
))
5652 && integer_zerop (range_binop (PLUS_EXPR
, NULL_TREE
,
5654 build_int_cst (TREE_TYPE (high1
), 1),
5662 /* The ranges might be also adjacent between the maximum and
5663 minimum values of the given type. For
5664 - [{min,-}, x] and - [y, {max,-}] ranges where x + 1 < y
5665 return + [x + 1, y - 1]. */
5666 if (low0
== 0 && high1
== 0)
5668 low
= range_successor (high0
);
5669 high
= range_predecessor (low1
);
5670 if (low
== 0 || high
== 0)
5680 in_p
= 0, low
= low0
, high
= high0
;
5682 in_p
= 0, low
= low0
, high
= high1
;
5685 *pin_p
= in_p
, *plow
= low
, *phigh
= high
;
5690 /* Subroutine of fold, looking inside expressions of the form
5691 A op B ? A : C, where ARG0, ARG1 and ARG2 are the three operands
5692 of the COND_EXPR. This function is being used also to optimize
5693 A op B ? C : A, by reversing the comparison first.
5695 Return a folded expression whose code is not a COND_EXPR
5696 anymore, or NULL_TREE if no folding opportunity is found. */
5699 fold_cond_expr_with_comparison (location_t loc
, tree type
,
5700 tree arg0
, tree arg1
, tree arg2
)
5702 enum tree_code comp_code
= TREE_CODE (arg0
);
5703 tree arg00
= TREE_OPERAND (arg0
, 0);
5704 tree arg01
= TREE_OPERAND (arg0
, 1);
5705 tree arg1_type
= TREE_TYPE (arg1
);
5711 /* If we have A op 0 ? A : -A, consider applying the following
5714 A == 0? A : -A same as -A
5715 A != 0? A : -A same as A
5716 A >= 0? A : -A same as abs (A)
5717 A > 0? A : -A same as abs (A)
5718 A <= 0? A : -A same as -abs (A)
5719 A < 0? A : -A same as -abs (A)
5721 None of these transformations work for modes with signed
5722 zeros. If A is +/-0, the first two transformations will
5723 change the sign of the result (from +0 to -0, or vice
5724 versa). The last four will fix the sign of the result,
5725 even though the original expressions could be positive or
5726 negative, depending on the sign of A.
5728 Note that all these transformations are correct if A is
5729 NaN, since the two alternatives (A and -A) are also NaNs. */
5730 if (!HONOR_SIGNED_ZEROS (element_mode (type
))
5731 && (FLOAT_TYPE_P (TREE_TYPE (arg01
))
5732 ? real_zerop (arg01
)
5733 : integer_zerop (arg01
))
5734 && ((TREE_CODE (arg2
) == NEGATE_EXPR
5735 && operand_equal_p (TREE_OPERAND (arg2
, 0), arg1
, 0))
5736 /* In the case that A is of the form X-Y, '-A' (arg2) may
5737 have already been folded to Y-X, check for that. */
5738 || (TREE_CODE (arg1
) == MINUS_EXPR
5739 && TREE_CODE (arg2
) == MINUS_EXPR
5740 && operand_equal_p (TREE_OPERAND (arg1
, 0),
5741 TREE_OPERAND (arg2
, 1), 0)
5742 && operand_equal_p (TREE_OPERAND (arg1
, 1),
5743 TREE_OPERAND (arg2
, 0), 0))))
5748 tem
= fold_convert_loc (loc
, arg1_type
, arg1
);
5749 return fold_convert_loc (loc
, type
, negate_expr (tem
));
5752 return fold_convert_loc (loc
, type
, arg1
);
5755 if (flag_trapping_math
)
5760 if (TYPE_UNSIGNED (TREE_TYPE (arg1
)))
5762 tem
= fold_build1_loc (loc
, ABS_EXPR
, TREE_TYPE (arg1
), arg1
);
5763 return fold_convert_loc (loc
, type
, tem
);
5766 if (flag_trapping_math
)
5771 if (TYPE_UNSIGNED (TREE_TYPE (arg1
)))
5773 tem
= fold_build1_loc (loc
, ABS_EXPR
, TREE_TYPE (arg1
), arg1
);
5774 return negate_expr (fold_convert_loc (loc
, type
, tem
));
5776 gcc_assert (TREE_CODE_CLASS (comp_code
) == tcc_comparison
);
5780 /* A != 0 ? A : 0 is simply A, unless A is -0. Likewise
5781 A == 0 ? A : 0 is always 0 unless A is -0. Note that
5782 both transformations are correct when A is NaN: A != 0
5783 is then true, and A == 0 is false. */
5785 if (!HONOR_SIGNED_ZEROS (element_mode (type
))
5786 && integer_zerop (arg01
) && integer_zerop (arg2
))
5788 if (comp_code
== NE_EXPR
)
5789 return fold_convert_loc (loc
, type
, arg1
);
5790 else if (comp_code
== EQ_EXPR
)
5791 return build_zero_cst (type
);
5794 /* Try some transformations of A op B ? A : B.
5796 A == B? A : B same as B
5797 A != B? A : B same as A
5798 A >= B? A : B same as max (A, B)
5799 A > B? A : B same as max (B, A)
5800 A <= B? A : B same as min (A, B)
5801 A < B? A : B same as min (B, A)
5803 As above, these transformations don't work in the presence
5804 of signed zeros. For example, if A and B are zeros of
5805 opposite sign, the first two transformations will change
5806 the sign of the result. In the last four, the original
5807 expressions give different results for (A=+0, B=-0) and
5808 (A=-0, B=+0), but the transformed expressions do not.
5810 The first two transformations are correct if either A or B
5811 is a NaN. In the first transformation, the condition will
5812 be false, and B will indeed be chosen. In the case of the
5813 second transformation, the condition A != B will be true,
5814 and A will be chosen.
5816 The conversions to max() and min() are not correct if B is
5817 a number and A is not. The conditions in the original
5818 expressions will be false, so all four give B. The min()
5819 and max() versions would give a NaN instead. */
5820 if (!HONOR_SIGNED_ZEROS (element_mode (type
))
5821 && operand_equal_for_comparison_p (arg01
, arg2
)
5822 /* Avoid these transformations if the COND_EXPR may be used
5823 as an lvalue in the C++ front-end. PR c++/19199. */
5825 || VECTOR_TYPE_P (type
)
5826 || (! lang_GNU_CXX ()
5827 && strcmp (lang_hooks
.name
, "GNU Objective-C++") != 0)
5828 || ! maybe_lvalue_p (arg1
)
5829 || ! maybe_lvalue_p (arg2
)))
5831 tree comp_op0
= arg00
;
5832 tree comp_op1
= arg01
;
5833 tree comp_type
= TREE_TYPE (comp_op0
);
5838 return fold_convert_loc (loc
, type
, arg2
);
5840 return fold_convert_loc (loc
, type
, arg1
);
5845 /* In C++ a ?: expression can be an lvalue, so put the
5846 operand which will be used if they are equal first
5847 so that we can convert this back to the
5848 corresponding COND_EXPR. */
5849 if (!HONOR_NANS (arg1
))
5851 comp_op0
= fold_convert_loc (loc
, comp_type
, comp_op0
);
5852 comp_op1
= fold_convert_loc (loc
, comp_type
, comp_op1
);
5853 tem
= (comp_code
== LE_EXPR
|| comp_code
== UNLE_EXPR
)
5854 ? fold_build2_loc (loc
, MIN_EXPR
, comp_type
, comp_op0
, comp_op1
)
5855 : fold_build2_loc (loc
, MIN_EXPR
, comp_type
,
5856 comp_op1
, comp_op0
);
5857 return fold_convert_loc (loc
, type
, tem
);
5864 if (!HONOR_NANS (arg1
))
5866 comp_op0
= fold_convert_loc (loc
, comp_type
, comp_op0
);
5867 comp_op1
= fold_convert_loc (loc
, comp_type
, comp_op1
);
5868 tem
= (comp_code
== GE_EXPR
|| comp_code
== UNGE_EXPR
)
5869 ? fold_build2_loc (loc
, MAX_EXPR
, comp_type
, comp_op0
, comp_op1
)
5870 : fold_build2_loc (loc
, MAX_EXPR
, comp_type
,
5871 comp_op1
, comp_op0
);
5872 return fold_convert_loc (loc
, type
, tem
);
5876 if (!HONOR_NANS (arg1
))
5877 return fold_convert_loc (loc
, type
, arg2
);
5880 if (!HONOR_NANS (arg1
))
5881 return fold_convert_loc (loc
, type
, arg1
);
5884 gcc_assert (TREE_CODE_CLASS (comp_code
) == tcc_comparison
);
5894 #ifndef LOGICAL_OP_NON_SHORT_CIRCUIT
5895 #define LOGICAL_OP_NON_SHORT_CIRCUIT \
5896 (BRANCH_COST (optimize_function_for_speed_p (cfun), \
5900 /* EXP is some logical combination of boolean tests. See if we can
5901 merge it into some range test. Return the new tree if so. */
5904 fold_range_test (location_t loc
, enum tree_code code
, tree type
,
5907 int or_op
= (code
== TRUTH_ORIF_EXPR
5908 || code
== TRUTH_OR_EXPR
);
5909 int in0_p
, in1_p
, in_p
;
5910 tree low0
, low1
, low
, high0
, high1
, high
;
5911 bool strict_overflow_p
= false;
5913 const char * const warnmsg
= G_("assuming signed overflow does not occur "
5914 "when simplifying range test");
5916 if (!INTEGRAL_TYPE_P (type
))
5919 lhs
= make_range (op0
, &in0_p
, &low0
, &high0
, &strict_overflow_p
);
5920 rhs
= make_range (op1
, &in1_p
, &low1
, &high1
, &strict_overflow_p
);
5922 /* If this is an OR operation, invert both sides; we will invert
5923 again at the end. */
5925 in0_p
= ! in0_p
, in1_p
= ! in1_p
;
5927 /* If both expressions are the same, if we can merge the ranges, and we
5928 can build the range test, return it or it inverted. If one of the
5929 ranges is always true or always false, consider it to be the same
5930 expression as the other. */
5931 if ((lhs
== 0 || rhs
== 0 || operand_equal_p (lhs
, rhs
, 0))
5932 && merge_ranges (&in_p
, &low
, &high
, in0_p
, low0
, high0
,
5934 && (tem
= (build_range_check (loc
, type
,
5936 : rhs
!= 0 ? rhs
: integer_zero_node
,
5937 in_p
, low
, high
))) != 0)
5939 if (strict_overflow_p
)
5940 fold_overflow_warning (warnmsg
, WARN_STRICT_OVERFLOW_COMPARISON
);
5941 return or_op
? invert_truthvalue_loc (loc
, tem
) : tem
;
5944 /* On machines where the branch cost is expensive, if this is a
5945 short-circuited branch and the underlying object on both sides
5946 is the same, make a non-short-circuit operation. */
5947 bool logical_op_non_short_circuit
= LOGICAL_OP_NON_SHORT_CIRCUIT
;
5948 if (param_logical_op_non_short_circuit
!= -1)
5949 logical_op_non_short_circuit
5950 = param_logical_op_non_short_circuit
;
5951 if (logical_op_non_short_circuit
5952 && !flag_sanitize_coverage
5953 && lhs
!= 0 && rhs
!= 0
5954 && (code
== TRUTH_ANDIF_EXPR
|| code
== TRUTH_ORIF_EXPR
)
5955 && operand_equal_p (lhs
, rhs
, 0))
5957 /* If simple enough, just rewrite. Otherwise, make a SAVE_EXPR
5958 unless we are at top level or LHS contains a PLACEHOLDER_EXPR, in
5959 which cases we can't do this. */
5960 if (simple_operand_p (lhs
))
5961 return build2_loc (loc
, code
== TRUTH_ANDIF_EXPR
5962 ? TRUTH_AND_EXPR
: TRUTH_OR_EXPR
,
5965 else if (!lang_hooks
.decls
.global_bindings_p ()
5966 && !CONTAINS_PLACEHOLDER_P (lhs
))
5968 tree common
= save_expr (lhs
);
5970 if ((lhs
= build_range_check (loc
, type
, common
,
5971 or_op
? ! in0_p
: in0_p
,
5973 && (rhs
= build_range_check (loc
, type
, common
,
5974 or_op
? ! in1_p
: in1_p
,
5977 if (strict_overflow_p
)
5978 fold_overflow_warning (warnmsg
,
5979 WARN_STRICT_OVERFLOW_COMPARISON
);
5980 return build2_loc (loc
, code
== TRUTH_ANDIF_EXPR
5981 ? TRUTH_AND_EXPR
: TRUTH_OR_EXPR
,
5990 /* Subroutine for fold_truth_andor_1: C is an INTEGER_CST interpreted as a P
5991 bit value. Arrange things so the extra bits will be set to zero if and
5992 only if C is signed-extended to its full width. If MASK is nonzero,
5993 it is an INTEGER_CST that should be AND'ed with the extra bits. */
5996 unextend (tree c
, int p
, int unsignedp
, tree mask
)
5998 tree type
= TREE_TYPE (c
);
5999 int modesize
= GET_MODE_BITSIZE (SCALAR_INT_TYPE_MODE (type
));
6002 if (p
== modesize
|| unsignedp
)
6005 /* We work by getting just the sign bit into the low-order bit, then
6006 into the high-order bit, then sign-extend. We then XOR that value
6008 temp
= build_int_cst (TREE_TYPE (c
),
6009 wi::extract_uhwi (wi::to_wide (c
), p
- 1, 1));
6011 /* We must use a signed type in order to get an arithmetic right shift.
6012 However, we must also avoid introducing accidental overflows, so that
6013 a subsequent call to integer_zerop will work. Hence we must
6014 do the type conversion here. At this point, the constant is either
6015 zero or one, and the conversion to a signed type can never overflow.
6016 We could get an overflow if this conversion is done anywhere else. */
6017 if (TYPE_UNSIGNED (type
))
6018 temp
= fold_convert (signed_type_for (type
), temp
);
6020 temp
= const_binop (LSHIFT_EXPR
, temp
, size_int (modesize
- 1));
6021 temp
= const_binop (RSHIFT_EXPR
, temp
, size_int (modesize
- p
- 1));
6023 temp
= const_binop (BIT_AND_EXPR
, temp
,
6024 fold_convert (TREE_TYPE (c
), mask
));
6025 /* If necessary, convert the type back to match the type of C. */
6026 if (TYPE_UNSIGNED (type
))
6027 temp
= fold_convert (type
, temp
);
6029 return fold_convert (type
, const_binop (BIT_XOR_EXPR
, c
, temp
));
6032 /* For an expression that has the form
6036 we can drop one of the inner expressions and simplify to
6040 LOC is the location of the resulting expression. OP is the inner
6041 logical operation; the left-hand side in the examples above, while CMPOP
6042 is the right-hand side. RHS_ONLY is used to prevent us from accidentally
6043 removing a condition that guards another, as in
6044 (A != NULL && A->...) || A == NULL
6045 which we must not transform. If RHS_ONLY is true, only eliminate the
6046 right-most operand of the inner logical operation. */
6049 merge_truthop_with_opposite_arm (location_t loc
, tree op
, tree cmpop
,
6052 tree type
= TREE_TYPE (cmpop
);
6053 enum tree_code code
= TREE_CODE (cmpop
);
6054 enum tree_code truthop_code
= TREE_CODE (op
);
6055 tree lhs
= TREE_OPERAND (op
, 0);
6056 tree rhs
= TREE_OPERAND (op
, 1);
6057 tree orig_lhs
= lhs
, orig_rhs
= rhs
;
6058 enum tree_code rhs_code
= TREE_CODE (rhs
);
6059 enum tree_code lhs_code
= TREE_CODE (lhs
);
6060 enum tree_code inv_code
;
6062 if (TREE_SIDE_EFFECTS (op
) || TREE_SIDE_EFFECTS (cmpop
))
6065 if (TREE_CODE_CLASS (code
) != tcc_comparison
)
6068 if (rhs_code
== truthop_code
)
6070 tree newrhs
= merge_truthop_with_opposite_arm (loc
, rhs
, cmpop
, rhs_only
);
6071 if (newrhs
!= NULL_TREE
)
6074 rhs_code
= TREE_CODE (rhs
);
6077 if (lhs_code
== truthop_code
&& !rhs_only
)
6079 tree newlhs
= merge_truthop_with_opposite_arm (loc
, lhs
, cmpop
, false);
6080 if (newlhs
!= NULL_TREE
)
6083 lhs_code
= TREE_CODE (lhs
);
6087 inv_code
= invert_tree_comparison (code
, HONOR_NANS (type
));
6088 if (inv_code
== rhs_code
6089 && operand_equal_p (TREE_OPERAND (rhs
, 0), TREE_OPERAND (cmpop
, 0), 0)
6090 && operand_equal_p (TREE_OPERAND (rhs
, 1), TREE_OPERAND (cmpop
, 1), 0))
6092 if (!rhs_only
&& inv_code
== lhs_code
6093 && operand_equal_p (TREE_OPERAND (lhs
, 0), TREE_OPERAND (cmpop
, 0), 0)
6094 && operand_equal_p (TREE_OPERAND (lhs
, 1), TREE_OPERAND (cmpop
, 1), 0))
6096 if (rhs
!= orig_rhs
|| lhs
!= orig_lhs
)
6097 return fold_build2_loc (loc
, truthop_code
, TREE_TYPE (cmpop
),
6102 /* Find ways of folding logical expressions of LHS and RHS:
6103 Try to merge two comparisons to the same innermost item.
6104 Look for range tests like "ch >= '0' && ch <= '9'".
6105 Look for combinations of simple terms on machines with expensive branches
6106 and evaluate the RHS unconditionally.
6108 For example, if we have p->a == 2 && p->b == 4 and we can make an
6109 object large enough to span both A and B, we can do this with a comparison
6110 against the object ANDed with the a mask.
6112 If we have p->a == q->a && p->b == q->b, we may be able to use bit masking
6113 operations to do this with one comparison.
6115 We check for both normal comparisons and the BIT_AND_EXPRs made this by
6116 function and the one above.
6118 CODE is the logical operation being done. It can be TRUTH_ANDIF_EXPR,
6119 TRUTH_AND_EXPR, TRUTH_ORIF_EXPR, or TRUTH_OR_EXPR.
6121 TRUTH_TYPE is the type of the logical operand and LHS and RHS are its
6124 We return the simplified tree or 0 if no optimization is possible. */
6127 fold_truth_andor_1 (location_t loc
, enum tree_code code
, tree truth_type
,
6130 /* If this is the "or" of two comparisons, we can do something if
6131 the comparisons are NE_EXPR. If this is the "and", we can do something
6132 if the comparisons are EQ_EXPR. I.e.,
6133 (a->b == 2 && a->c == 4) can become (a->new == NEW).
6135 WANTED_CODE is this operation code. For single bit fields, we can
6136 convert EQ_EXPR to NE_EXPR so we need not reject the "wrong"
6137 comparison for one-bit fields. */
6139 enum tree_code wanted_code
;
6140 enum tree_code lcode
, rcode
;
6141 tree ll_arg
, lr_arg
, rl_arg
, rr_arg
;
6142 tree ll_inner
, lr_inner
, rl_inner
, rr_inner
;
6143 HOST_WIDE_INT ll_bitsize
, ll_bitpos
, lr_bitsize
, lr_bitpos
;
6144 HOST_WIDE_INT rl_bitsize
, rl_bitpos
, rr_bitsize
, rr_bitpos
;
6145 HOST_WIDE_INT xll_bitpos
, xlr_bitpos
, xrl_bitpos
, xrr_bitpos
;
6146 HOST_WIDE_INT lnbitsize
, lnbitpos
, rnbitsize
, rnbitpos
;
6147 int ll_unsignedp
, lr_unsignedp
, rl_unsignedp
, rr_unsignedp
;
6148 int ll_reversep
, lr_reversep
, rl_reversep
, rr_reversep
;
6149 machine_mode ll_mode
, lr_mode
, rl_mode
, rr_mode
;
6150 scalar_int_mode lnmode
, rnmode
;
6151 tree ll_mask
, lr_mask
, rl_mask
, rr_mask
;
6152 tree ll_and_mask
, lr_and_mask
, rl_and_mask
, rr_and_mask
;
6153 tree l_const
, r_const
;
6154 tree lntype
, rntype
, result
;
6155 HOST_WIDE_INT first_bit
, end_bit
;
6158 /* Start by getting the comparison codes. Fail if anything is volatile.
6159 If one operand is a BIT_AND_EXPR with the constant one, treat it as if
6160 it were surrounded with a NE_EXPR. */
6162 if (TREE_SIDE_EFFECTS (lhs
) || TREE_SIDE_EFFECTS (rhs
))
6165 lcode
= TREE_CODE (lhs
);
6166 rcode
= TREE_CODE (rhs
);
6168 if (lcode
== BIT_AND_EXPR
&& integer_onep (TREE_OPERAND (lhs
, 1)))
6170 lhs
= build2 (NE_EXPR
, truth_type
, lhs
,
6171 build_int_cst (TREE_TYPE (lhs
), 0));
6175 if (rcode
== BIT_AND_EXPR
&& integer_onep (TREE_OPERAND (rhs
, 1)))
6177 rhs
= build2 (NE_EXPR
, truth_type
, rhs
,
6178 build_int_cst (TREE_TYPE (rhs
), 0));
6182 if (TREE_CODE_CLASS (lcode
) != tcc_comparison
6183 || TREE_CODE_CLASS (rcode
) != tcc_comparison
)
6186 ll_arg
= TREE_OPERAND (lhs
, 0);
6187 lr_arg
= TREE_OPERAND (lhs
, 1);
6188 rl_arg
= TREE_OPERAND (rhs
, 0);
6189 rr_arg
= TREE_OPERAND (rhs
, 1);
6191 /* Simplify (x<y) && (x==y) into (x<=y) and related optimizations. */
6192 if (simple_operand_p (ll_arg
)
6193 && simple_operand_p (lr_arg
))
6195 if (operand_equal_p (ll_arg
, rl_arg
, 0)
6196 && operand_equal_p (lr_arg
, rr_arg
, 0))
6198 result
= combine_comparisons (loc
, code
, lcode
, rcode
,
6199 truth_type
, ll_arg
, lr_arg
);
6203 else if (operand_equal_p (ll_arg
, rr_arg
, 0)
6204 && operand_equal_p (lr_arg
, rl_arg
, 0))
6206 result
= combine_comparisons (loc
, code
, lcode
,
6207 swap_tree_comparison (rcode
),
6208 truth_type
, ll_arg
, lr_arg
);
6214 code
= ((code
== TRUTH_AND_EXPR
|| code
== TRUTH_ANDIF_EXPR
)
6215 ? TRUTH_AND_EXPR
: TRUTH_OR_EXPR
);
6217 /* If the RHS can be evaluated unconditionally and its operands are
6218 simple, it wins to evaluate the RHS unconditionally on machines
6219 with expensive branches. In this case, this isn't a comparison
6220 that can be merged. */
6222 if (BRANCH_COST (optimize_function_for_speed_p (cfun
),
6224 && ! FLOAT_TYPE_P (TREE_TYPE (rl_arg
))
6225 && simple_operand_p (rl_arg
)
6226 && simple_operand_p (rr_arg
))
6228 /* Convert (a != 0) || (b != 0) into (a | b) != 0. */
6229 if (code
== TRUTH_OR_EXPR
6230 && lcode
== NE_EXPR
&& integer_zerop (lr_arg
)
6231 && rcode
== NE_EXPR
&& integer_zerop (rr_arg
)
6232 && TREE_TYPE (ll_arg
) == TREE_TYPE (rl_arg
)
6233 && INTEGRAL_TYPE_P (TREE_TYPE (ll_arg
)))
6234 return build2_loc (loc
, NE_EXPR
, truth_type
,
6235 build2 (BIT_IOR_EXPR
, TREE_TYPE (ll_arg
),
6237 build_int_cst (TREE_TYPE (ll_arg
), 0));
6239 /* Convert (a == 0) && (b == 0) into (a | b) == 0. */
6240 if (code
== TRUTH_AND_EXPR
6241 && lcode
== EQ_EXPR
&& integer_zerop (lr_arg
)
6242 && rcode
== EQ_EXPR
&& integer_zerop (rr_arg
)
6243 && TREE_TYPE (ll_arg
) == TREE_TYPE (rl_arg
)
6244 && INTEGRAL_TYPE_P (TREE_TYPE (ll_arg
)))
6245 return build2_loc (loc
, EQ_EXPR
, truth_type
,
6246 build2 (BIT_IOR_EXPR
, TREE_TYPE (ll_arg
),
6248 build_int_cst (TREE_TYPE (ll_arg
), 0));
6251 /* See if the comparisons can be merged. Then get all the parameters for
6254 if ((lcode
!= EQ_EXPR
&& lcode
!= NE_EXPR
)
6255 || (rcode
!= EQ_EXPR
&& rcode
!= NE_EXPR
))
6258 ll_reversep
= lr_reversep
= rl_reversep
= rr_reversep
= 0;
6260 ll_inner
= decode_field_reference (loc
, &ll_arg
,
6261 &ll_bitsize
, &ll_bitpos
, &ll_mode
,
6262 &ll_unsignedp
, &ll_reversep
, &volatilep
,
6263 &ll_mask
, &ll_and_mask
);
6264 lr_inner
= decode_field_reference (loc
, &lr_arg
,
6265 &lr_bitsize
, &lr_bitpos
, &lr_mode
,
6266 &lr_unsignedp
, &lr_reversep
, &volatilep
,
6267 &lr_mask
, &lr_and_mask
);
6268 rl_inner
= decode_field_reference (loc
, &rl_arg
,
6269 &rl_bitsize
, &rl_bitpos
, &rl_mode
,
6270 &rl_unsignedp
, &rl_reversep
, &volatilep
,
6271 &rl_mask
, &rl_and_mask
);
6272 rr_inner
= decode_field_reference (loc
, &rr_arg
,
6273 &rr_bitsize
, &rr_bitpos
, &rr_mode
,
6274 &rr_unsignedp
, &rr_reversep
, &volatilep
,
6275 &rr_mask
, &rr_and_mask
);
6277 /* It must be true that the inner operation on the lhs of each
6278 comparison must be the same if we are to be able to do anything.
6279 Then see if we have constants. If not, the same must be true for
6282 || ll_reversep
!= rl_reversep
6283 || ll_inner
== 0 || rl_inner
== 0
6284 || ! operand_equal_p (ll_inner
, rl_inner
, 0))
6287 if (TREE_CODE (lr_arg
) == INTEGER_CST
6288 && TREE_CODE (rr_arg
) == INTEGER_CST
)
6290 l_const
= lr_arg
, r_const
= rr_arg
;
6291 lr_reversep
= ll_reversep
;
6293 else if (lr_reversep
!= rr_reversep
6294 || lr_inner
== 0 || rr_inner
== 0
6295 || ! operand_equal_p (lr_inner
, rr_inner
, 0))
6298 l_const
= r_const
= 0;
6300 /* If either comparison code is not correct for our logical operation,
6301 fail. However, we can convert a one-bit comparison against zero into
6302 the opposite comparison against that bit being set in the field. */
6304 wanted_code
= (code
== TRUTH_AND_EXPR
? EQ_EXPR
: NE_EXPR
);
6305 if (lcode
!= wanted_code
)
6307 if (l_const
&& integer_zerop (l_const
) && integer_pow2p (ll_mask
))
6309 /* Make the left operand unsigned, since we are only interested
6310 in the value of one bit. Otherwise we are doing the wrong
6319 /* This is analogous to the code for l_const above. */
6320 if (rcode
!= wanted_code
)
6322 if (r_const
&& integer_zerop (r_const
) && integer_pow2p (rl_mask
))
6331 /* See if we can find a mode that contains both fields being compared on
6332 the left. If we can't, fail. Otherwise, update all constants and masks
6333 to be relative to a field of that size. */
6334 first_bit
= MIN (ll_bitpos
, rl_bitpos
);
6335 end_bit
= MAX (ll_bitpos
+ ll_bitsize
, rl_bitpos
+ rl_bitsize
);
6336 if (!get_best_mode (end_bit
- first_bit
, first_bit
, 0, 0,
6337 TYPE_ALIGN (TREE_TYPE (ll_inner
)), BITS_PER_WORD
,
6338 volatilep
, &lnmode
))
6341 lnbitsize
= GET_MODE_BITSIZE (lnmode
);
6342 lnbitpos
= first_bit
& ~ (lnbitsize
- 1);
6343 lntype
= lang_hooks
.types
.type_for_size (lnbitsize
, 1);
6344 xll_bitpos
= ll_bitpos
- lnbitpos
, xrl_bitpos
= rl_bitpos
- lnbitpos
;
6346 if (ll_reversep
? !BYTES_BIG_ENDIAN
: BYTES_BIG_ENDIAN
)
6348 xll_bitpos
= lnbitsize
- xll_bitpos
- ll_bitsize
;
6349 xrl_bitpos
= lnbitsize
- xrl_bitpos
- rl_bitsize
;
6352 ll_mask
= const_binop (LSHIFT_EXPR
, fold_convert_loc (loc
, lntype
, ll_mask
),
6353 size_int (xll_bitpos
));
6354 rl_mask
= const_binop (LSHIFT_EXPR
, fold_convert_loc (loc
, lntype
, rl_mask
),
6355 size_int (xrl_bitpos
));
6359 l_const
= fold_convert_loc (loc
, lntype
, l_const
);
6360 l_const
= unextend (l_const
, ll_bitsize
, ll_unsignedp
, ll_and_mask
);
6361 l_const
= const_binop (LSHIFT_EXPR
, l_const
, size_int (xll_bitpos
));
6362 if (! integer_zerop (const_binop (BIT_AND_EXPR
, l_const
,
6363 fold_build1_loc (loc
, BIT_NOT_EXPR
,
6366 warning (0, "comparison is always %d", wanted_code
== NE_EXPR
);
6368 return constant_boolean_node (wanted_code
== NE_EXPR
, truth_type
);
6373 r_const
= fold_convert_loc (loc
, lntype
, r_const
);
6374 r_const
= unextend (r_const
, rl_bitsize
, rl_unsignedp
, rl_and_mask
);
6375 r_const
= const_binop (LSHIFT_EXPR
, r_const
, size_int (xrl_bitpos
));
6376 if (! integer_zerop (const_binop (BIT_AND_EXPR
, r_const
,
6377 fold_build1_loc (loc
, BIT_NOT_EXPR
,
6380 warning (0, "comparison is always %d", wanted_code
== NE_EXPR
);
6382 return constant_boolean_node (wanted_code
== NE_EXPR
, truth_type
);
6386 /* If the right sides are not constant, do the same for it. Also,
6387 disallow this optimization if a size, signedness or storage order
6388 mismatch occurs between the left and right sides. */
6391 if (ll_bitsize
!= lr_bitsize
|| rl_bitsize
!= rr_bitsize
6392 || ll_unsignedp
!= lr_unsignedp
|| rl_unsignedp
!= rr_unsignedp
6393 || ll_reversep
!= lr_reversep
6394 /* Make sure the two fields on the right
6395 correspond to the left without being swapped. */
6396 || ll_bitpos
- rl_bitpos
!= lr_bitpos
- rr_bitpos
)
6399 first_bit
= MIN (lr_bitpos
, rr_bitpos
);
6400 end_bit
= MAX (lr_bitpos
+ lr_bitsize
, rr_bitpos
+ rr_bitsize
);
6401 if (!get_best_mode (end_bit
- first_bit
, first_bit
, 0, 0,
6402 TYPE_ALIGN (TREE_TYPE (lr_inner
)), BITS_PER_WORD
,
6403 volatilep
, &rnmode
))
6406 rnbitsize
= GET_MODE_BITSIZE (rnmode
);
6407 rnbitpos
= first_bit
& ~ (rnbitsize
- 1);
6408 rntype
= lang_hooks
.types
.type_for_size (rnbitsize
, 1);
6409 xlr_bitpos
= lr_bitpos
- rnbitpos
, xrr_bitpos
= rr_bitpos
- rnbitpos
;
6411 if (lr_reversep
? !BYTES_BIG_ENDIAN
: BYTES_BIG_ENDIAN
)
6413 xlr_bitpos
= rnbitsize
- xlr_bitpos
- lr_bitsize
;
6414 xrr_bitpos
= rnbitsize
- xrr_bitpos
- rr_bitsize
;
6417 lr_mask
= const_binop (LSHIFT_EXPR
, fold_convert_loc (loc
,
6419 size_int (xlr_bitpos
));
6420 rr_mask
= const_binop (LSHIFT_EXPR
, fold_convert_loc (loc
,
6422 size_int (xrr_bitpos
));
6424 /* Make a mask that corresponds to both fields being compared.
6425 Do this for both items being compared. If the operands are the
6426 same size and the bits being compared are in the same position
6427 then we can do this by masking both and comparing the masked
6429 ll_mask
= const_binop (BIT_IOR_EXPR
, ll_mask
, rl_mask
);
6430 lr_mask
= const_binop (BIT_IOR_EXPR
, lr_mask
, rr_mask
);
6431 if (lnbitsize
== rnbitsize
6432 && xll_bitpos
== xlr_bitpos
6436 lhs
= make_bit_field_ref (loc
, ll_inner
, ll_arg
,
6437 lntype
, lnbitsize
, lnbitpos
,
6438 ll_unsignedp
|| rl_unsignedp
, ll_reversep
);
6439 if (! all_ones_mask_p (ll_mask
, lnbitsize
))
6440 lhs
= build2 (BIT_AND_EXPR
, lntype
, lhs
, ll_mask
);
6442 rhs
= make_bit_field_ref (loc
, lr_inner
, lr_arg
,
6443 rntype
, rnbitsize
, rnbitpos
,
6444 lr_unsignedp
|| rr_unsignedp
, lr_reversep
);
6445 if (! all_ones_mask_p (lr_mask
, rnbitsize
))
6446 rhs
= build2 (BIT_AND_EXPR
, rntype
, rhs
, lr_mask
);
6448 return build2_loc (loc
, wanted_code
, truth_type
, lhs
, rhs
);
6451 /* There is still another way we can do something: If both pairs of
6452 fields being compared are adjacent, we may be able to make a wider
6453 field containing them both.
6455 Note that we still must mask the lhs/rhs expressions. Furthermore,
6456 the mask must be shifted to account for the shift done by
6457 make_bit_field_ref. */
6458 if (((ll_bitsize
+ ll_bitpos
== rl_bitpos
6459 && lr_bitsize
+ lr_bitpos
== rr_bitpos
)
6460 || (ll_bitpos
== rl_bitpos
+ rl_bitsize
6461 && lr_bitpos
== rr_bitpos
+ rr_bitsize
))
6469 lhs
= make_bit_field_ref (loc
, ll_inner
, ll_arg
, lntype
,
6470 ll_bitsize
+ rl_bitsize
,
6471 MIN (ll_bitpos
, rl_bitpos
),
6472 ll_unsignedp
, ll_reversep
);
6473 rhs
= make_bit_field_ref (loc
, lr_inner
, lr_arg
, rntype
,
6474 lr_bitsize
+ rr_bitsize
,
6475 MIN (lr_bitpos
, rr_bitpos
),
6476 lr_unsignedp
, lr_reversep
);
6478 ll_mask
= const_binop (RSHIFT_EXPR
, ll_mask
,
6479 size_int (MIN (xll_bitpos
, xrl_bitpos
)));
6480 lr_mask
= const_binop (RSHIFT_EXPR
, lr_mask
,
6481 size_int (MIN (xlr_bitpos
, xrr_bitpos
)));
6483 /* Convert to the smaller type before masking out unwanted bits. */
6485 if (lntype
!= rntype
)
6487 if (lnbitsize
> rnbitsize
)
6489 lhs
= fold_convert_loc (loc
, rntype
, lhs
);
6490 ll_mask
= fold_convert_loc (loc
, rntype
, ll_mask
);
6493 else if (lnbitsize
< rnbitsize
)
6495 rhs
= fold_convert_loc (loc
, lntype
, rhs
);
6496 lr_mask
= fold_convert_loc (loc
, lntype
, lr_mask
);
6501 if (! all_ones_mask_p (ll_mask
, ll_bitsize
+ rl_bitsize
))
6502 lhs
= build2 (BIT_AND_EXPR
, type
, lhs
, ll_mask
);
6504 if (! all_ones_mask_p (lr_mask
, lr_bitsize
+ rr_bitsize
))
6505 rhs
= build2 (BIT_AND_EXPR
, type
, rhs
, lr_mask
);
6507 return build2_loc (loc
, wanted_code
, truth_type
, lhs
, rhs
);
6513 /* Handle the case of comparisons with constants. If there is something in
6514 common between the masks, those bits of the constants must be the same.
6515 If not, the condition is always false. Test for this to avoid generating
6516 incorrect code below. */
6517 result
= const_binop (BIT_AND_EXPR
, ll_mask
, rl_mask
);
6518 if (! integer_zerop (result
)
6519 && simple_cst_equal (const_binop (BIT_AND_EXPR
, result
, l_const
),
6520 const_binop (BIT_AND_EXPR
, result
, r_const
)) != 1)
6522 if (wanted_code
== NE_EXPR
)
6524 warning (0, "%<or%> of unmatched not-equal tests is always 1");
6525 return constant_boolean_node (true, truth_type
);
6529 warning (0, "%<and%> of mutually exclusive equal-tests is always 0");
6530 return constant_boolean_node (false, truth_type
);
6537 /* Construct the expression we will return. First get the component
6538 reference we will make. Unless the mask is all ones the width of
6539 that field, perform the mask operation. Then compare with the
6541 result
= make_bit_field_ref (loc
, ll_inner
, ll_arg
,
6542 lntype
, lnbitsize
, lnbitpos
,
6543 ll_unsignedp
|| rl_unsignedp
, ll_reversep
);
6545 ll_mask
= const_binop (BIT_IOR_EXPR
, ll_mask
, rl_mask
);
6546 if (! all_ones_mask_p (ll_mask
, lnbitsize
))
6547 result
= build2_loc (loc
, BIT_AND_EXPR
, lntype
, result
, ll_mask
);
6549 return build2_loc (loc
, wanted_code
, truth_type
, result
,
6550 const_binop (BIT_IOR_EXPR
, l_const
, r_const
));
6553 /* T is an integer expression that is being multiplied, divided, or taken a
6554 modulus (CODE says which and what kind of divide or modulus) by a
6555 constant C. See if we can eliminate that operation by folding it with
6556 other operations already in T. WIDE_TYPE, if non-null, is a type that
6557 should be used for the computation if wider than our type.
6559 For example, if we are dividing (X * 8) + (Y * 16) by 4, we can return
6560 (X * 2) + (Y * 4). We must, however, be assured that either the original
6561 expression would not overflow or that overflow is undefined for the type
6562 in the language in question.
6564 If we return a non-null expression, it is an equivalent form of the
6565 original computation, but need not be in the original type.
6567 We set *STRICT_OVERFLOW_P to true if the return values depends on
6568 signed overflow being undefined. Otherwise we do not change
6569 *STRICT_OVERFLOW_P. */
6572 extract_muldiv (tree t
, tree c
, enum tree_code code
, tree wide_type
,
6573 bool *strict_overflow_p
)
6575 /* To avoid exponential search depth, refuse to allow recursion past
6576 three levels. Beyond that (1) it's highly unlikely that we'll find
6577 something interesting and (2) we've probably processed it before
6578 when we built the inner expression. */
6587 ret
= extract_muldiv_1 (t
, c
, code
, wide_type
, strict_overflow_p
);
6594 extract_muldiv_1 (tree t
, tree c
, enum tree_code code
, tree wide_type
,
6595 bool *strict_overflow_p
)
6597 tree type
= TREE_TYPE (t
);
6598 enum tree_code tcode
= TREE_CODE (t
);
6599 tree ctype
= (wide_type
!= 0
6600 && (GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (wide_type
))
6601 > GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (type
)))
6602 ? wide_type
: type
);
6604 int same_p
= tcode
== code
;
6605 tree op0
= NULL_TREE
, op1
= NULL_TREE
;
6606 bool sub_strict_overflow_p
;
6608 /* Don't deal with constants of zero here; they confuse the code below. */
6609 if (integer_zerop (c
))
6612 if (TREE_CODE_CLASS (tcode
) == tcc_unary
)
6613 op0
= TREE_OPERAND (t
, 0);
6615 if (TREE_CODE_CLASS (tcode
) == tcc_binary
)
6616 op0
= TREE_OPERAND (t
, 0), op1
= TREE_OPERAND (t
, 1);
6618 /* Note that we need not handle conditional operations here since fold
6619 already handles those cases. So just do arithmetic here. */
6623 /* For a constant, we can always simplify if we are a multiply
6624 or (for divide and modulus) if it is a multiple of our constant. */
6625 if (code
== MULT_EXPR
6626 || wi::multiple_of_p (wi::to_wide (t
), wi::to_wide (c
),
6629 tree tem
= const_binop (code
, fold_convert (ctype
, t
),
6630 fold_convert (ctype
, c
));
6631 /* If the multiplication overflowed, we lost information on it.
6632 See PR68142 and PR69845. */
6633 if (TREE_OVERFLOW (tem
))
6639 CASE_CONVERT
: case NON_LVALUE_EXPR
:
6640 /* If op0 is an expression ... */
6641 if ((COMPARISON_CLASS_P (op0
)
6642 || UNARY_CLASS_P (op0
)
6643 || BINARY_CLASS_P (op0
)
6644 || VL_EXP_CLASS_P (op0
)
6645 || EXPRESSION_CLASS_P (op0
))
6646 /* ... and has wrapping overflow, and its type is smaller
6647 than ctype, then we cannot pass through as widening. */
6648 && (((ANY_INTEGRAL_TYPE_P (TREE_TYPE (op0
))
6649 && TYPE_OVERFLOW_WRAPS (TREE_TYPE (op0
)))
6650 && (TYPE_PRECISION (ctype
)
6651 > TYPE_PRECISION (TREE_TYPE (op0
))))
6652 /* ... or this is a truncation (t is narrower than op0),
6653 then we cannot pass through this narrowing. */
6654 || (TYPE_PRECISION (type
)
6655 < TYPE_PRECISION (TREE_TYPE (op0
)))
6656 /* ... or signedness changes for division or modulus,
6657 then we cannot pass through this conversion. */
6658 || (code
!= MULT_EXPR
6659 && (TYPE_UNSIGNED (ctype
)
6660 != TYPE_UNSIGNED (TREE_TYPE (op0
))))
6661 /* ... or has undefined overflow while the converted to
6662 type has not, we cannot do the operation in the inner type
6663 as that would introduce undefined overflow. */
6664 || ((ANY_INTEGRAL_TYPE_P (TREE_TYPE (op0
))
6665 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (op0
)))
6666 && !TYPE_OVERFLOW_UNDEFINED (type
))))
6669 /* Pass the constant down and see if we can make a simplification. If
6670 we can, replace this expression with the inner simplification for
6671 possible later conversion to our or some other type. */
6672 if ((t2
= fold_convert (TREE_TYPE (op0
), c
)) != 0
6673 && TREE_CODE (t2
) == INTEGER_CST
6674 && !TREE_OVERFLOW (t2
)
6675 && (t1
= extract_muldiv (op0
, t2
, code
,
6676 code
== MULT_EXPR
? ctype
: NULL_TREE
,
6677 strict_overflow_p
)) != 0)
6682 /* If widening the type changes it from signed to unsigned, then we
6683 must avoid building ABS_EXPR itself as unsigned. */
6684 if (TYPE_UNSIGNED (ctype
) && !TYPE_UNSIGNED (type
))
6686 tree cstype
= (*signed_type_for
) (ctype
);
6687 if ((t1
= extract_muldiv (op0
, c
, code
, cstype
, strict_overflow_p
))
6690 t1
= fold_build1 (tcode
, cstype
, fold_convert (cstype
, t1
));
6691 return fold_convert (ctype
, t1
);
6695 /* If the constant is negative, we cannot simplify this. */
6696 if (tree_int_cst_sgn (c
) == -1)
6700 /* For division and modulus, type can't be unsigned, as e.g.
6701 (-(x / 2U)) / 2U isn't equal to -((x / 2U) / 2U) for x >= 2.
6702 For signed types, even with wrapping overflow, this is fine. */
6703 if (code
!= MULT_EXPR
&& TYPE_UNSIGNED (type
))
6705 if ((t1
= extract_muldiv (op0
, c
, code
, wide_type
, strict_overflow_p
))
6707 return fold_build1 (tcode
, ctype
, fold_convert (ctype
, t1
));
6710 case MIN_EXPR
: case MAX_EXPR
:
6711 /* If widening the type changes the signedness, then we can't perform
6712 this optimization as that changes the result. */
6713 if (TYPE_UNSIGNED (ctype
) != TYPE_UNSIGNED (type
))
6716 /* MIN (a, b) / 5 -> MIN (a / 5, b / 5) */
6717 sub_strict_overflow_p
= false;
6718 if ((t1
= extract_muldiv (op0
, c
, code
, wide_type
,
6719 &sub_strict_overflow_p
)) != 0
6720 && (t2
= extract_muldiv (op1
, c
, code
, wide_type
,
6721 &sub_strict_overflow_p
)) != 0)
6723 if (tree_int_cst_sgn (c
) < 0)
6724 tcode
= (tcode
== MIN_EXPR
? MAX_EXPR
: MIN_EXPR
);
6725 if (sub_strict_overflow_p
)
6726 *strict_overflow_p
= true;
6727 return fold_build2 (tcode
, ctype
, fold_convert (ctype
, t1
),
6728 fold_convert (ctype
, t2
));
6732 case LSHIFT_EXPR
: case RSHIFT_EXPR
:
6733 /* If the second operand is constant, this is a multiplication
6734 or floor division, by a power of two, so we can treat it that
6735 way unless the multiplier or divisor overflows. Signed
6736 left-shift overflow is implementation-defined rather than
6737 undefined in C90, so do not convert signed left shift into
6739 if (TREE_CODE (op1
) == INTEGER_CST
6740 && (tcode
== RSHIFT_EXPR
|| TYPE_UNSIGNED (TREE_TYPE (op0
)))
6741 /* const_binop may not detect overflow correctly,
6742 so check for it explicitly here. */
6743 && wi::gtu_p (TYPE_PRECISION (TREE_TYPE (size_one_node
)),
6745 && (t1
= fold_convert (ctype
,
6746 const_binop (LSHIFT_EXPR
, size_one_node
,
6748 && !TREE_OVERFLOW (t1
))
6749 return extract_muldiv (build2 (tcode
== LSHIFT_EXPR
6750 ? MULT_EXPR
: FLOOR_DIV_EXPR
,
6752 fold_convert (ctype
, op0
),
6754 c
, code
, wide_type
, strict_overflow_p
);
6757 case PLUS_EXPR
: case MINUS_EXPR
:
6758 /* See if we can eliminate the operation on both sides. If we can, we
6759 can return a new PLUS or MINUS. If we can't, the only remaining
6760 cases where we can do anything are if the second operand is a
6762 sub_strict_overflow_p
= false;
6763 t1
= extract_muldiv (op0
, c
, code
, wide_type
, &sub_strict_overflow_p
);
6764 t2
= extract_muldiv (op1
, c
, code
, wide_type
, &sub_strict_overflow_p
);
6765 if (t1
!= 0 && t2
!= 0
6766 && TYPE_OVERFLOW_WRAPS (ctype
)
6767 && (code
== MULT_EXPR
6768 /* If not multiplication, we can only do this if both operands
6769 are divisible by c. */
6770 || (multiple_of_p (ctype
, op0
, c
)
6771 && multiple_of_p (ctype
, op1
, c
))))
6773 if (sub_strict_overflow_p
)
6774 *strict_overflow_p
= true;
6775 return fold_build2 (tcode
, ctype
, fold_convert (ctype
, t1
),
6776 fold_convert (ctype
, t2
));
6779 /* If this was a subtraction, negate OP1 and set it to be an addition.
6780 This simplifies the logic below. */
6781 if (tcode
== MINUS_EXPR
)
6783 tcode
= PLUS_EXPR
, op1
= negate_expr (op1
);
6784 /* If OP1 was not easily negatable, the constant may be OP0. */
6785 if (TREE_CODE (op0
) == INTEGER_CST
)
6787 std::swap (op0
, op1
);
6792 if (TREE_CODE (op1
) != INTEGER_CST
)
6795 /* If either OP1 or C are negative, this optimization is not safe for
6796 some of the division and remainder types while for others we need
6797 to change the code. */
6798 if (tree_int_cst_sgn (op1
) < 0 || tree_int_cst_sgn (c
) < 0)
6800 if (code
== CEIL_DIV_EXPR
)
6801 code
= FLOOR_DIV_EXPR
;
6802 else if (code
== FLOOR_DIV_EXPR
)
6803 code
= CEIL_DIV_EXPR
;
6804 else if (code
!= MULT_EXPR
6805 && code
!= CEIL_MOD_EXPR
&& code
!= FLOOR_MOD_EXPR
)
6809 /* If it's a multiply or a division/modulus operation of a multiple
6810 of our constant, do the operation and verify it doesn't overflow. */
6811 if (code
== MULT_EXPR
6812 || wi::multiple_of_p (wi::to_wide (op1
), wi::to_wide (c
),
6815 op1
= const_binop (code
, fold_convert (ctype
, op1
),
6816 fold_convert (ctype
, c
));
6817 /* We allow the constant to overflow with wrapping semantics. */
6819 || (TREE_OVERFLOW (op1
) && !TYPE_OVERFLOW_WRAPS (ctype
)))
6825 /* If we have an unsigned type, we cannot widen the operation since it
6826 will change the result if the original computation overflowed. */
6827 if (TYPE_UNSIGNED (ctype
) && ctype
!= type
)
6830 /* The last case is if we are a multiply. In that case, we can
6831 apply the distributive law to commute the multiply and addition
6832 if the multiplication of the constants doesn't overflow
6833 and overflow is defined. With undefined overflow
6834 op0 * c might overflow, while (op0 + orig_op1) * c doesn't.
6835 But fold_plusminus_mult_expr would factor back any power-of-two
6836 value so do not distribute in the first place in this case. */
6837 if (code
== MULT_EXPR
6838 && TYPE_OVERFLOW_WRAPS (ctype
)
6839 && !(tree_fits_shwi_p (c
) && pow2p_hwi (absu_hwi (tree_to_shwi (c
)))))
6840 return fold_build2 (tcode
, ctype
,
6841 fold_build2 (code
, ctype
,
6842 fold_convert (ctype
, op0
),
6843 fold_convert (ctype
, c
)),
6849 /* We have a special case here if we are doing something like
6850 (C * 8) % 4 since we know that's zero. */
6851 if ((code
== TRUNC_MOD_EXPR
|| code
== CEIL_MOD_EXPR
6852 || code
== FLOOR_MOD_EXPR
|| code
== ROUND_MOD_EXPR
)
6853 /* If the multiplication can overflow we cannot optimize this. */
6854 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (t
))
6855 && TREE_CODE (TREE_OPERAND (t
, 1)) == INTEGER_CST
6856 && wi::multiple_of_p (wi::to_wide (op1
), wi::to_wide (c
),
6859 *strict_overflow_p
= true;
6860 return omit_one_operand (type
, integer_zero_node
, op0
);
6863 /* ... fall through ... */
6865 case TRUNC_DIV_EXPR
: case CEIL_DIV_EXPR
: case FLOOR_DIV_EXPR
:
6866 case ROUND_DIV_EXPR
: case EXACT_DIV_EXPR
:
6867 /* If we can extract our operation from the LHS, do so and return a
6868 new operation. Likewise for the RHS from a MULT_EXPR. Otherwise,
6869 do something only if the second operand is a constant. */
6871 && TYPE_OVERFLOW_WRAPS (ctype
)
6872 && (t1
= extract_muldiv (op0
, c
, code
, wide_type
,
6873 strict_overflow_p
)) != 0)
6874 return fold_build2 (tcode
, ctype
, fold_convert (ctype
, t1
),
6875 fold_convert (ctype
, op1
));
6876 else if (tcode
== MULT_EXPR
&& code
== MULT_EXPR
6877 && TYPE_OVERFLOW_WRAPS (ctype
)
6878 && (t1
= extract_muldiv (op1
, c
, code
, wide_type
,
6879 strict_overflow_p
)) != 0)
6880 return fold_build2 (tcode
, ctype
, fold_convert (ctype
, op0
),
6881 fold_convert (ctype
, t1
));
6882 else if (TREE_CODE (op1
) != INTEGER_CST
)
6885 /* If these are the same operation types, we can associate them
6886 assuming no overflow. */
6889 bool overflow_p
= false;
6890 wi::overflow_type overflow_mul
;
6891 signop sign
= TYPE_SIGN (ctype
);
6892 unsigned prec
= TYPE_PRECISION (ctype
);
6893 wide_int mul
= wi::mul (wi::to_wide (op1
, prec
),
6894 wi::to_wide (c
, prec
),
6895 sign
, &overflow_mul
);
6896 overflow_p
= TREE_OVERFLOW (c
) | TREE_OVERFLOW (op1
);
6898 && ((sign
== UNSIGNED
&& tcode
!= MULT_EXPR
) || sign
== SIGNED
))
6901 return fold_build2 (tcode
, ctype
, fold_convert (ctype
, op0
),
6902 wide_int_to_tree (ctype
, mul
));
6905 /* If these operations "cancel" each other, we have the main
6906 optimizations of this pass, which occur when either constant is a
6907 multiple of the other, in which case we replace this with either an
6908 operation or CODE or TCODE.
6910 If we have an unsigned type, we cannot do this since it will change
6911 the result if the original computation overflowed. */
6912 if (TYPE_OVERFLOW_UNDEFINED (ctype
)
6913 && ((code
== MULT_EXPR
&& tcode
== EXACT_DIV_EXPR
)
6914 || (tcode
== MULT_EXPR
6915 && code
!= TRUNC_MOD_EXPR
&& code
!= CEIL_MOD_EXPR
6916 && code
!= FLOOR_MOD_EXPR
&& code
!= ROUND_MOD_EXPR
6917 && code
!= MULT_EXPR
)))
6919 if (wi::multiple_of_p (wi::to_wide (op1
), wi::to_wide (c
),
6922 if (TYPE_OVERFLOW_UNDEFINED (ctype
))
6923 *strict_overflow_p
= true;
6924 return fold_build2 (tcode
, ctype
, fold_convert (ctype
, op0
),
6925 fold_convert (ctype
,
6926 const_binop (TRUNC_DIV_EXPR
,
6929 else if (wi::multiple_of_p (wi::to_wide (c
), wi::to_wide (op1
),
6932 if (TYPE_OVERFLOW_UNDEFINED (ctype
))
6933 *strict_overflow_p
= true;
6934 return fold_build2 (code
, ctype
, fold_convert (ctype
, op0
),
6935 fold_convert (ctype
,
6936 const_binop (TRUNC_DIV_EXPR
,
6949 /* Return a node which has the indicated constant VALUE (either 0 or
6950 1 for scalars or {-1,-1,..} or {0,0,...} for vectors),
6951 and is of the indicated TYPE. */
6954 constant_boolean_node (bool value
, tree type
)
6956 if (type
== integer_type_node
)
6957 return value
? integer_one_node
: integer_zero_node
;
6958 else if (type
== boolean_type_node
)
6959 return value
? boolean_true_node
: boolean_false_node
;
6960 else if (TREE_CODE (type
) == VECTOR_TYPE
)
6961 return build_vector_from_val (type
,
6962 build_int_cst (TREE_TYPE (type
),
6965 return fold_convert (type
, value
? integer_one_node
: integer_zero_node
);
6969 /* Transform `a + (b ? x : y)' into `b ? (a + x) : (a + y)'.
6970 Transform, `a + (x < y)' into `(x < y) ? (a + 1) : (a + 0)'. Here
6971 CODE corresponds to the `+', COND to the `(b ? x : y)' or `(x < y)'
6972 expression, and ARG to `a'. If COND_FIRST_P is nonzero, then the
6973 COND is the first argument to CODE; otherwise (as in the example
6974 given here), it is the second argument. TYPE is the type of the
6975 original expression. Return NULL_TREE if no simplification is
6979 fold_binary_op_with_conditional_arg (location_t loc
,
6980 enum tree_code code
,
6981 tree type
, tree op0
, tree op1
,
6982 tree cond
, tree arg
, int cond_first_p
)
6984 tree cond_type
= cond_first_p
? TREE_TYPE (op0
) : TREE_TYPE (op1
);
6985 tree arg_type
= cond_first_p
? TREE_TYPE (op1
) : TREE_TYPE (op0
);
6986 tree test
, true_value
, false_value
;
6987 tree lhs
= NULL_TREE
;
6988 tree rhs
= NULL_TREE
;
6989 enum tree_code cond_code
= COND_EXPR
;
6991 /* Do not move possibly trapping operations into the conditional as this
6992 pessimizes code and causes gimplification issues when applied late. */
6993 if (operation_could_trap_p (code
, FLOAT_TYPE_P (type
),
6994 ANY_INTEGRAL_TYPE_P (type
)
6995 && TYPE_OVERFLOW_TRAPS (type
), op1
))
6998 if (TREE_CODE (cond
) == COND_EXPR
6999 || TREE_CODE (cond
) == VEC_COND_EXPR
)
7001 test
= TREE_OPERAND (cond
, 0);
7002 true_value
= TREE_OPERAND (cond
, 1);
7003 false_value
= TREE_OPERAND (cond
, 2);
7004 /* If this operand throws an expression, then it does not make
7005 sense to try to perform a logical or arithmetic operation
7007 if (VOID_TYPE_P (TREE_TYPE (true_value
)))
7009 if (VOID_TYPE_P (TREE_TYPE (false_value
)))
7012 else if (!(TREE_CODE (type
) != VECTOR_TYPE
7013 && TREE_CODE (TREE_TYPE (cond
)) == VECTOR_TYPE
))
7015 tree testtype
= TREE_TYPE (cond
);
7017 true_value
= constant_boolean_node (true, testtype
);
7018 false_value
= constant_boolean_node (false, testtype
);
7021 /* Detect the case of mixing vector and scalar types - bail out. */
7024 if (TREE_CODE (TREE_TYPE (test
)) == VECTOR_TYPE
)
7025 cond_code
= VEC_COND_EXPR
;
7027 /* This transformation is only worthwhile if we don't have to wrap ARG
7028 in a SAVE_EXPR and the operation can be simplified without recursing
7029 on at least one of the branches once its pushed inside the COND_EXPR. */
7030 if (!TREE_CONSTANT (arg
)
7031 && (TREE_SIDE_EFFECTS (arg
)
7032 || TREE_CODE (arg
) == COND_EXPR
|| TREE_CODE (arg
) == VEC_COND_EXPR
7033 || TREE_CONSTANT (true_value
) || TREE_CONSTANT (false_value
)))
7036 arg
= fold_convert_loc (loc
, arg_type
, arg
);
7039 true_value
= fold_convert_loc (loc
, cond_type
, true_value
);
7041 lhs
= fold_build2_loc (loc
, code
, type
, true_value
, arg
);
7043 lhs
= fold_build2_loc (loc
, code
, type
, arg
, true_value
);
7047 false_value
= fold_convert_loc (loc
, cond_type
, false_value
);
7049 rhs
= fold_build2_loc (loc
, code
, type
, false_value
, arg
);
7051 rhs
= fold_build2_loc (loc
, code
, type
, arg
, false_value
);
7054 /* Check that we have simplified at least one of the branches. */
7055 if (!TREE_CONSTANT (arg
) && !TREE_CONSTANT (lhs
) && !TREE_CONSTANT (rhs
))
7058 return fold_build3_loc (loc
, cond_code
, type
, test
, lhs
, rhs
);
7062 /* Subroutine of fold() that checks for the addition of +/- 0.0.
7064 If !NEGATE, return true if ADDEND is +/-0.0 and, for all X of type
7065 TYPE, X + ADDEND is the same as X. If NEGATE, return true if X -
7066 ADDEND is the same as X.
7068 X + 0 and X - 0 both give X when X is NaN, infinite, or nonzero
7069 and finite. The problematic cases are when X is zero, and its mode
7070 has signed zeros. In the case of rounding towards -infinity,
7071 X - 0 is not the same as X because 0 - 0 is -0. In other rounding
7072 modes, X + 0 is not the same as X because -0 + 0 is 0. */
7075 fold_real_zero_addition_p (const_tree type
, const_tree addend
, int negate
)
7077 if (!real_zerop (addend
))
7080 /* Don't allow the fold with -fsignaling-nans. */
7081 if (HONOR_SNANS (type
))
7084 /* Allow the fold if zeros aren't signed, or their sign isn't important. */
7085 if (!HONOR_SIGNED_ZEROS (type
))
7088 /* There is no case that is safe for all rounding modes. */
7089 if (HONOR_SIGN_DEPENDENT_ROUNDING (type
))
7092 /* In a vector or complex, we would need to check the sign of all zeros. */
7093 if (TREE_CODE (addend
) == VECTOR_CST
)
7094 addend
= uniform_vector_p (addend
);
7095 if (!addend
|| TREE_CODE (addend
) != REAL_CST
)
7098 /* Treat x + -0 as x - 0 and x - -0 as x + 0. */
7099 if (REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (addend
)))
7102 /* The mode has signed zeros, and we have to honor their sign.
7103 In this situation, there is only one case we can return true for.
7104 X - 0 is the same as X with default rounding. */
7108 /* Subroutine of match.pd that optimizes comparisons of a division by
7109 a nonzero integer constant against an integer constant, i.e.
7112 CODE is the comparison operator: EQ_EXPR, NE_EXPR, GT_EXPR, LT_EXPR,
7113 GE_EXPR or LE_EXPR. ARG01 and ARG1 must be a INTEGER_CST. */
7116 fold_div_compare (enum tree_code code
, tree c1
, tree c2
, tree
*lo
,
7117 tree
*hi
, bool *neg_overflow
)
7119 tree prod
, tmp
, type
= TREE_TYPE (c1
);
7120 signop sign
= TYPE_SIGN (type
);
7121 wi::overflow_type overflow
;
7123 /* We have to do this the hard way to detect unsigned overflow.
7124 prod = int_const_binop (MULT_EXPR, c1, c2); */
7125 wide_int val
= wi::mul (wi::to_wide (c1
), wi::to_wide (c2
), sign
, &overflow
);
7126 prod
= force_fit_type (type
, val
, -1, overflow
);
7127 *neg_overflow
= false;
7129 if (sign
== UNSIGNED
)
7131 tmp
= int_const_binop (MINUS_EXPR
, c1
, build_int_cst (type
, 1));
7134 /* Likewise *hi = int_const_binop (PLUS_EXPR, prod, tmp). */
7135 val
= wi::add (wi::to_wide (prod
), wi::to_wide (tmp
), sign
, &overflow
);
7136 *hi
= force_fit_type (type
, val
, -1, overflow
| TREE_OVERFLOW (prod
));
7138 else if (tree_int_cst_sgn (c1
) >= 0)
7140 tmp
= int_const_binop (MINUS_EXPR
, c1
, build_int_cst (type
, 1));
7141 switch (tree_int_cst_sgn (c2
))
7144 *neg_overflow
= true;
7145 *lo
= int_const_binop (MINUS_EXPR
, prod
, tmp
);
7150 *lo
= fold_negate_const (tmp
, type
);
7155 *hi
= int_const_binop (PLUS_EXPR
, prod
, tmp
);
7165 /* A negative divisor reverses the relational operators. */
7166 code
= swap_tree_comparison (code
);
7168 tmp
= int_const_binop (PLUS_EXPR
, c1
, build_int_cst (type
, 1));
7169 switch (tree_int_cst_sgn (c2
))
7172 *hi
= int_const_binop (MINUS_EXPR
, prod
, tmp
);
7177 *hi
= fold_negate_const (tmp
, type
);
7182 *neg_overflow
= true;
7183 *lo
= int_const_binop (PLUS_EXPR
, prod
, tmp
);
7192 if (code
!= EQ_EXPR
&& code
!= NE_EXPR
)
7195 if (TREE_OVERFLOW (*lo
)
7196 || operand_equal_p (*lo
, TYPE_MIN_VALUE (type
), 0))
7198 if (TREE_OVERFLOW (*hi
)
7199 || operand_equal_p (*hi
, TYPE_MAX_VALUE (type
), 0))
7206 /* If CODE with arguments ARG0 and ARG1 represents a single bit
7207 equality/inequality test, then return a simplified form of the test
7208 using a sign testing. Otherwise return NULL. TYPE is the desired
7212 fold_single_bit_test_into_sign_test (location_t loc
,
7213 enum tree_code code
, tree arg0
, tree arg1
,
7216 /* If this is testing a single bit, we can optimize the test. */
7217 if ((code
== NE_EXPR
|| code
== EQ_EXPR
)
7218 && TREE_CODE (arg0
) == BIT_AND_EXPR
&& integer_zerop (arg1
)
7219 && integer_pow2p (TREE_OPERAND (arg0
, 1)))
7221 /* If we have (A & C) != 0 where C is the sign bit of A, convert
7222 this into A < 0. Similarly for (A & C) == 0 into A >= 0. */
7223 tree arg00
= sign_bit_p (TREE_OPERAND (arg0
, 0), TREE_OPERAND (arg0
, 1));
7225 if (arg00
!= NULL_TREE
7226 /* This is only a win if casting to a signed type is cheap,
7227 i.e. when arg00's type is not a partial mode. */
7228 && type_has_mode_precision_p (TREE_TYPE (arg00
)))
7230 tree stype
= signed_type_for (TREE_TYPE (arg00
));
7231 return fold_build2_loc (loc
, code
== EQ_EXPR
? GE_EXPR
: LT_EXPR
,
7233 fold_convert_loc (loc
, stype
, arg00
),
7234 build_int_cst (stype
, 0));
7241 /* If CODE with arguments ARG0 and ARG1 represents a single bit
7242 equality/inequality test, then return a simplified form of
7243 the test using shifts and logical operations. Otherwise return
7244 NULL. TYPE is the desired result type. */
7247 fold_single_bit_test (location_t loc
, enum tree_code code
,
7248 tree arg0
, tree arg1
, tree result_type
)
7250 /* If this is testing a single bit, we can optimize the test. */
7251 if ((code
== NE_EXPR
|| code
== EQ_EXPR
)
7252 && TREE_CODE (arg0
) == BIT_AND_EXPR
&& integer_zerop (arg1
)
7253 && integer_pow2p (TREE_OPERAND (arg0
, 1)))
7255 tree inner
= TREE_OPERAND (arg0
, 0);
7256 tree type
= TREE_TYPE (arg0
);
7257 int bitnum
= tree_log2 (TREE_OPERAND (arg0
, 1));
7258 scalar_int_mode operand_mode
= SCALAR_INT_TYPE_MODE (type
);
7260 tree signed_type
, unsigned_type
, intermediate_type
;
7263 /* First, see if we can fold the single bit test into a sign-bit
7265 tem
= fold_single_bit_test_into_sign_test (loc
, code
, arg0
, arg1
,
7270 /* Otherwise we have (A & C) != 0 where C is a single bit,
7271 convert that into ((A >> C2) & 1). Where C2 = log2(C).
7272 Similarly for (A & C) == 0. */
7274 /* If INNER is a right shift of a constant and it plus BITNUM does
7275 not overflow, adjust BITNUM and INNER. */
7276 if (TREE_CODE (inner
) == RSHIFT_EXPR
7277 && TREE_CODE (TREE_OPERAND (inner
, 1)) == INTEGER_CST
7278 && bitnum
< TYPE_PRECISION (type
)
7279 && wi::ltu_p (wi::to_wide (TREE_OPERAND (inner
, 1)),
7280 TYPE_PRECISION (type
) - bitnum
))
7282 bitnum
+= tree_to_uhwi (TREE_OPERAND (inner
, 1));
7283 inner
= TREE_OPERAND (inner
, 0);
7286 /* If we are going to be able to omit the AND below, we must do our
7287 operations as unsigned. If we must use the AND, we have a choice.
7288 Normally unsigned is faster, but for some machines signed is. */
7289 ops_unsigned
= (load_extend_op (operand_mode
) == SIGN_EXTEND
7290 && !flag_syntax_only
) ? 0 : 1;
7292 signed_type
= lang_hooks
.types
.type_for_mode (operand_mode
, 0);
7293 unsigned_type
= lang_hooks
.types
.type_for_mode (operand_mode
, 1);
7294 intermediate_type
= ops_unsigned
? unsigned_type
: signed_type
;
7295 inner
= fold_convert_loc (loc
, intermediate_type
, inner
);
7298 inner
= build2 (RSHIFT_EXPR
, intermediate_type
,
7299 inner
, size_int (bitnum
));
7301 one
= build_int_cst (intermediate_type
, 1);
7303 if (code
== EQ_EXPR
)
7304 inner
= fold_build2_loc (loc
, BIT_XOR_EXPR
, intermediate_type
, inner
, one
);
7306 /* Put the AND last so it can combine with more things. */
7307 inner
= build2 (BIT_AND_EXPR
, intermediate_type
, inner
, one
);
7309 /* Make sure to return the proper type. */
7310 inner
= fold_convert_loc (loc
, result_type
, inner
);
7317 /* Test whether it is preferable two swap two operands, ARG0 and
7318 ARG1, for example because ARG0 is an integer constant and ARG1
7322 tree_swap_operands_p (const_tree arg0
, const_tree arg1
)
7324 if (CONSTANT_CLASS_P (arg1
))
7326 if (CONSTANT_CLASS_P (arg0
))
7332 if (TREE_CONSTANT (arg1
))
7334 if (TREE_CONSTANT (arg0
))
7337 /* It is preferable to swap two SSA_NAME to ensure a canonical form
7338 for commutative and comparison operators. Ensuring a canonical
7339 form allows the optimizers to find additional redundancies without
7340 having to explicitly check for both orderings. */
7341 if (TREE_CODE (arg0
) == SSA_NAME
7342 && TREE_CODE (arg1
) == SSA_NAME
7343 && SSA_NAME_VERSION (arg0
) > SSA_NAME_VERSION (arg1
))
7346 /* Put SSA_NAMEs last. */
7347 if (TREE_CODE (arg1
) == SSA_NAME
)
7349 if (TREE_CODE (arg0
) == SSA_NAME
)
7352 /* Put variables last. */
7362 /* Fold A < X && A + 1 > Y to A < X && A >= Y. Normally A + 1 > Y
7363 means A >= Y && A != MAX, but in this case we know that
7364 A < X <= MAX. INEQ is A + 1 > Y, BOUND is A < X. */
7367 fold_to_nonsharp_ineq_using_bound (location_t loc
, tree ineq
, tree bound
)
7369 tree a
, typea
, type
= TREE_TYPE (ineq
), a1
, diff
, y
;
7371 if (TREE_CODE (bound
) == LT_EXPR
)
7372 a
= TREE_OPERAND (bound
, 0);
7373 else if (TREE_CODE (bound
) == GT_EXPR
)
7374 a
= TREE_OPERAND (bound
, 1);
7378 typea
= TREE_TYPE (a
);
7379 if (!INTEGRAL_TYPE_P (typea
)
7380 && !POINTER_TYPE_P (typea
))
7383 if (TREE_CODE (ineq
) == LT_EXPR
)
7385 a1
= TREE_OPERAND (ineq
, 1);
7386 y
= TREE_OPERAND (ineq
, 0);
7388 else if (TREE_CODE (ineq
) == GT_EXPR
)
7390 a1
= TREE_OPERAND (ineq
, 0);
7391 y
= TREE_OPERAND (ineq
, 1);
7396 if (TREE_TYPE (a1
) != typea
)
7399 if (POINTER_TYPE_P (typea
))
7401 /* Convert the pointer types into integer before taking the difference. */
7402 tree ta
= fold_convert_loc (loc
, ssizetype
, a
);
7403 tree ta1
= fold_convert_loc (loc
, ssizetype
, a1
);
7404 diff
= fold_binary_loc (loc
, MINUS_EXPR
, ssizetype
, ta1
, ta
);
7407 diff
= fold_binary_loc (loc
, MINUS_EXPR
, typea
, a1
, a
);
7409 if (!diff
|| !integer_onep (diff
))
7412 return fold_build2_loc (loc
, GE_EXPR
, type
, a
, y
);
7415 /* Fold a sum or difference of at least one multiplication.
7416 Returns the folded tree or NULL if no simplification could be made. */
7419 fold_plusminus_mult_expr (location_t loc
, enum tree_code code
, tree type
,
7420 tree arg0
, tree arg1
)
7422 tree arg00
, arg01
, arg10
, arg11
;
7423 tree alt0
= NULL_TREE
, alt1
= NULL_TREE
, same
;
7425 /* (A * C) +- (B * C) -> (A+-B) * C.
7426 (A * C) +- A -> A * (C+-1).
7427 We are most concerned about the case where C is a constant,
7428 but other combinations show up during loop reduction. Since
7429 it is not difficult, try all four possibilities. */
7431 if (TREE_CODE (arg0
) == MULT_EXPR
)
7433 arg00
= TREE_OPERAND (arg0
, 0);
7434 arg01
= TREE_OPERAND (arg0
, 1);
7436 else if (TREE_CODE (arg0
) == INTEGER_CST
)
7438 arg00
= build_one_cst (type
);
7443 /* We cannot generate constant 1 for fract. */
7444 if (ALL_FRACT_MODE_P (TYPE_MODE (type
)))
7447 arg01
= build_one_cst (type
);
7449 if (TREE_CODE (arg1
) == MULT_EXPR
)
7451 arg10
= TREE_OPERAND (arg1
, 0);
7452 arg11
= TREE_OPERAND (arg1
, 1);
7454 else if (TREE_CODE (arg1
) == INTEGER_CST
)
7456 arg10
= build_one_cst (type
);
7457 /* As we canonicalize A - 2 to A + -2 get rid of that sign for
7458 the purpose of this canonicalization. */
7459 if (wi::neg_p (wi::to_wide (arg1
), TYPE_SIGN (TREE_TYPE (arg1
)))
7460 && negate_expr_p (arg1
)
7461 && code
== PLUS_EXPR
)
7463 arg11
= negate_expr (arg1
);
7471 /* We cannot generate constant 1 for fract. */
7472 if (ALL_FRACT_MODE_P (TYPE_MODE (type
)))
7475 arg11
= build_one_cst (type
);
7479 /* Prefer factoring a common non-constant. */
7480 if (operand_equal_p (arg00
, arg10
, 0))
7481 same
= arg00
, alt0
= arg01
, alt1
= arg11
;
7482 else if (operand_equal_p (arg01
, arg11
, 0))
7483 same
= arg01
, alt0
= arg00
, alt1
= arg10
;
7484 else if (operand_equal_p (arg00
, arg11
, 0))
7485 same
= arg00
, alt0
= arg01
, alt1
= arg10
;
7486 else if (operand_equal_p (arg01
, arg10
, 0))
7487 same
= arg01
, alt0
= arg00
, alt1
= arg11
;
7489 /* No identical multiplicands; see if we can find a common
7490 power-of-two factor in non-power-of-two multiplies. This
7491 can help in multi-dimensional array access. */
7492 else if (tree_fits_shwi_p (arg01
) && tree_fits_shwi_p (arg11
))
7494 HOST_WIDE_INT int01
= tree_to_shwi (arg01
);
7495 HOST_WIDE_INT int11
= tree_to_shwi (arg11
);
7500 /* Move min of absolute values to int11. */
7501 if (absu_hwi (int01
) < absu_hwi (int11
))
7503 tmp
= int01
, int01
= int11
, int11
= tmp
;
7504 alt0
= arg00
, arg00
= arg10
, arg10
= alt0
;
7511 const unsigned HOST_WIDE_INT factor
= absu_hwi (int11
);
7513 && pow2p_hwi (factor
)
7514 && (int01
& (factor
- 1)) == 0
7515 /* The remainder should not be a constant, otherwise we
7516 end up folding i * 4 + 2 to (i * 2 + 1) * 2 which has
7517 increased the number of multiplications necessary. */
7518 && TREE_CODE (arg10
) != INTEGER_CST
)
7520 alt0
= fold_build2_loc (loc
, MULT_EXPR
, TREE_TYPE (arg00
), arg00
,
7521 build_int_cst (TREE_TYPE (arg00
),
7526 maybe_same
= alt0
, alt0
= alt1
, alt1
= maybe_same
;
7533 if (! ANY_INTEGRAL_TYPE_P (type
)
7534 || TYPE_OVERFLOW_WRAPS (type
)
7535 /* We are neither factoring zero nor minus one. */
7536 || TREE_CODE (same
) == INTEGER_CST
)
7537 return fold_build2_loc (loc
, MULT_EXPR
, type
,
7538 fold_build2_loc (loc
, code
, type
,
7539 fold_convert_loc (loc
, type
, alt0
),
7540 fold_convert_loc (loc
, type
, alt1
)),
7541 fold_convert_loc (loc
, type
, same
));
7543 /* Same may be zero and thus the operation 'code' may overflow. Likewise
7544 same may be minus one and thus the multiplication may overflow. Perform
7545 the sum operation in an unsigned type. */
7546 tree utype
= unsigned_type_for (type
);
7547 tree tem
= fold_build2_loc (loc
, code
, utype
,
7548 fold_convert_loc (loc
, utype
, alt0
),
7549 fold_convert_loc (loc
, utype
, alt1
));
7550 /* If the sum evaluated to a constant that is not -INF the multiplication
7552 if (TREE_CODE (tem
) == INTEGER_CST
7553 && (wi::to_wide (tem
)
7554 != wi::min_value (TYPE_PRECISION (utype
), SIGNED
)))
7555 return fold_build2_loc (loc
, MULT_EXPR
, type
,
7556 fold_convert (type
, tem
), same
);
7558 /* Do not resort to unsigned multiplication because
7559 we lose the no-overflow property of the expression. */
7563 /* Subroutine of native_encode_expr. Encode the INTEGER_CST
7564 specified by EXPR into the buffer PTR of length LEN bytes.
7565 Return the number of bytes placed in the buffer, or zero
7569 native_encode_int (const_tree expr
, unsigned char *ptr
, int len
, int off
)
7571 tree type
= TREE_TYPE (expr
);
7572 int total_bytes
= GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (type
));
7573 int byte
, offset
, word
, words
;
7574 unsigned char value
;
7576 if ((off
== -1 && total_bytes
> len
) || off
>= total_bytes
)
7583 return MIN (len
, total_bytes
- off
);
7585 words
= total_bytes
/ UNITS_PER_WORD
;
7587 for (byte
= 0; byte
< total_bytes
; byte
++)
7589 int bitpos
= byte
* BITS_PER_UNIT
;
7590 /* Extend EXPR according to TYPE_SIGN if the precision isn't a whole
7592 value
= wi::extract_uhwi (wi::to_widest (expr
), bitpos
, BITS_PER_UNIT
);
7594 if (total_bytes
> UNITS_PER_WORD
)
7596 word
= byte
/ UNITS_PER_WORD
;
7597 if (WORDS_BIG_ENDIAN
)
7598 word
= (words
- 1) - word
;
7599 offset
= word
* UNITS_PER_WORD
;
7600 if (BYTES_BIG_ENDIAN
)
7601 offset
+= (UNITS_PER_WORD
- 1) - (byte
% UNITS_PER_WORD
);
7603 offset
+= byte
% UNITS_PER_WORD
;
7606 offset
= BYTES_BIG_ENDIAN
? (total_bytes
- 1) - byte
: byte
;
7607 if (offset
>= off
&& offset
- off
< len
)
7608 ptr
[offset
- off
] = value
;
7610 return MIN (len
, total_bytes
- off
);
7614 /* Subroutine of native_encode_expr. Encode the FIXED_CST
7615 specified by EXPR into the buffer PTR of length LEN bytes.
7616 Return the number of bytes placed in the buffer, or zero
7620 native_encode_fixed (const_tree expr
, unsigned char *ptr
, int len
, int off
)
7622 tree type
= TREE_TYPE (expr
);
7623 scalar_mode mode
= SCALAR_TYPE_MODE (type
);
7624 int total_bytes
= GET_MODE_SIZE (mode
);
7625 FIXED_VALUE_TYPE value
;
7626 tree i_value
, i_type
;
7628 if (total_bytes
* BITS_PER_UNIT
> HOST_BITS_PER_DOUBLE_INT
)
7631 i_type
= lang_hooks
.types
.type_for_size (GET_MODE_BITSIZE (mode
), 1);
7633 if (NULL_TREE
== i_type
|| TYPE_PRECISION (i_type
) != total_bytes
)
7636 value
= TREE_FIXED_CST (expr
);
7637 i_value
= double_int_to_tree (i_type
, value
.data
);
7639 return native_encode_int (i_value
, ptr
, len
, off
);
7643 /* Subroutine of native_encode_expr. Encode the REAL_CST
7644 specified by EXPR into the buffer PTR of length LEN bytes.
7645 Return the number of bytes placed in the buffer, or zero
7649 native_encode_real (const_tree expr
, unsigned char *ptr
, int len
, int off
)
7651 tree type
= TREE_TYPE (expr
);
7652 int total_bytes
= GET_MODE_SIZE (SCALAR_FLOAT_TYPE_MODE (type
));
7653 int byte
, offset
, word
, words
, bitpos
;
7654 unsigned char value
;
7656 /* There are always 32 bits in each long, no matter the size of
7657 the hosts long. We handle floating point representations with
7661 if ((off
== -1 && total_bytes
> len
) || off
>= total_bytes
)
7668 return MIN (len
, total_bytes
- off
);
7670 words
= (32 / BITS_PER_UNIT
) / UNITS_PER_WORD
;
7672 real_to_target (tmp
, TREE_REAL_CST_PTR (expr
), TYPE_MODE (type
));
7674 for (bitpos
= 0; bitpos
< total_bytes
* BITS_PER_UNIT
;
7675 bitpos
+= BITS_PER_UNIT
)
7677 byte
= (bitpos
/ BITS_PER_UNIT
) & 3;
7678 value
= (unsigned char) (tmp
[bitpos
/ 32] >> (bitpos
& 31));
7680 if (UNITS_PER_WORD
< 4)
7682 word
= byte
/ UNITS_PER_WORD
;
7683 if (WORDS_BIG_ENDIAN
)
7684 word
= (words
- 1) - word
;
7685 offset
= word
* UNITS_PER_WORD
;
7686 if (BYTES_BIG_ENDIAN
)
7687 offset
+= (UNITS_PER_WORD
- 1) - (byte
% UNITS_PER_WORD
);
7689 offset
+= byte
% UNITS_PER_WORD
;
7694 if (BYTES_BIG_ENDIAN
)
7696 /* Reverse bytes within each long, or within the entire float
7697 if it's smaller than a long (for HFmode). */
7698 offset
= MIN (3, total_bytes
- 1) - offset
;
7699 gcc_assert (offset
>= 0);
7702 offset
= offset
+ ((bitpos
/ BITS_PER_UNIT
) & ~3);
7704 && offset
- off
< len
)
7705 ptr
[offset
- off
] = value
;
7707 return MIN (len
, total_bytes
- off
);
7710 /* Subroutine of native_encode_expr. Encode the COMPLEX_CST
7711 specified by EXPR into the buffer PTR of length LEN bytes.
7712 Return the number of bytes placed in the buffer, or zero
7716 native_encode_complex (const_tree expr
, unsigned char *ptr
, int len
, int off
)
7721 part
= TREE_REALPART (expr
);
7722 rsize
= native_encode_expr (part
, ptr
, len
, off
);
7723 if (off
== -1 && rsize
== 0)
7725 part
= TREE_IMAGPART (expr
);
7727 off
= MAX (0, off
- GET_MODE_SIZE (SCALAR_TYPE_MODE (TREE_TYPE (part
))));
7728 isize
= native_encode_expr (part
, ptr
? ptr
+ rsize
: NULL
,
7730 if (off
== -1 && isize
!= rsize
)
7732 return rsize
+ isize
;
7735 /* Like native_encode_vector, but only encode the first COUNT elements.
7736 The other arguments are as for native_encode_vector. */
7739 native_encode_vector_part (const_tree expr
, unsigned char *ptr
, int len
,
7740 int off
, unsigned HOST_WIDE_INT count
)
7742 tree itype
= TREE_TYPE (TREE_TYPE (expr
));
7743 if (VECTOR_BOOLEAN_TYPE_P (TREE_TYPE (expr
))
7744 && TYPE_PRECISION (itype
) <= BITS_PER_UNIT
)
7746 /* This is the only case in which elements can be smaller than a byte.
7747 Element 0 is always in the lsb of the containing byte. */
7748 unsigned int elt_bits
= TYPE_PRECISION (itype
);
7749 int total_bytes
= CEIL (elt_bits
* count
, BITS_PER_UNIT
);
7750 if ((off
== -1 && total_bytes
> len
) || off
>= total_bytes
)
7756 /* Zero the buffer and then set bits later where necessary. */
7757 int extract_bytes
= MIN (len
, total_bytes
- off
);
7759 memset (ptr
, 0, extract_bytes
);
7761 unsigned int elts_per_byte
= BITS_PER_UNIT
/ elt_bits
;
7762 unsigned int first_elt
= off
* elts_per_byte
;
7763 unsigned int extract_elts
= extract_bytes
* elts_per_byte
;
7764 for (unsigned int i
= 0; i
< extract_elts
; ++i
)
7766 tree elt
= VECTOR_CST_ELT (expr
, first_elt
+ i
);
7767 if (TREE_CODE (elt
) != INTEGER_CST
)
7770 if (ptr
&& wi::extract_uhwi (wi::to_wide (elt
), 0, 1))
7772 unsigned int bit
= i
* elt_bits
;
7773 ptr
[bit
/ BITS_PER_UNIT
] |= 1 << (bit
% BITS_PER_UNIT
);
7776 return extract_bytes
;
7780 int size
= GET_MODE_SIZE (SCALAR_TYPE_MODE (itype
));
7781 for (unsigned HOST_WIDE_INT i
= 0; i
< count
; i
++)
7788 tree elem
= VECTOR_CST_ELT (expr
, i
);
7789 int res
= native_encode_expr (elem
, ptr
? ptr
+ offset
: NULL
,
7791 if ((off
== -1 && res
!= size
) || res
== 0)
7795 return (off
== -1 && i
< count
- 1) ? 0 : offset
;
7802 /* Subroutine of native_encode_expr. Encode the VECTOR_CST
7803 specified by EXPR into the buffer PTR of length LEN bytes.
7804 Return the number of bytes placed in the buffer, or zero
7808 native_encode_vector (const_tree expr
, unsigned char *ptr
, int len
, int off
)
7810 unsigned HOST_WIDE_INT count
;
7811 if (!VECTOR_CST_NELTS (expr
).is_constant (&count
))
7813 return native_encode_vector_part (expr
, ptr
, len
, off
, count
);
7817 /* Subroutine of native_encode_expr. Encode the STRING_CST
7818 specified by EXPR into the buffer PTR of length LEN bytes.
7819 Return the number of bytes placed in the buffer, or zero
7823 native_encode_string (const_tree expr
, unsigned char *ptr
, int len
, int off
)
7825 tree type
= TREE_TYPE (expr
);
7827 /* Wide-char strings are encoded in target byte-order so native
7828 encoding them is trivial. */
7829 if (BITS_PER_UNIT
!= CHAR_BIT
7830 || TREE_CODE (type
) != ARRAY_TYPE
7831 || TREE_CODE (TREE_TYPE (type
)) != INTEGER_TYPE
7832 || !tree_fits_shwi_p (TYPE_SIZE_UNIT (type
)))
7835 HOST_WIDE_INT total_bytes
= tree_to_shwi (TYPE_SIZE_UNIT (TREE_TYPE (expr
)));
7836 if ((off
== -1 && total_bytes
> len
) || off
>= total_bytes
)
7840 len
= MIN (total_bytes
- off
, len
);
7846 if (off
< TREE_STRING_LENGTH (expr
))
7848 written
= MIN (len
, TREE_STRING_LENGTH (expr
) - off
);
7849 memcpy (ptr
, TREE_STRING_POINTER (expr
) + off
, written
);
7851 memset (ptr
+ written
, 0, len
- written
);
7857 /* Subroutine of fold_view_convert_expr. Encode the INTEGER_CST,
7858 REAL_CST, COMPLEX_CST or VECTOR_CST specified by EXPR into the
7859 buffer PTR of length LEN bytes. If PTR is NULL, don't actually store
7860 anything, just do a dry run. If OFF is not -1 then start
7861 the encoding at byte offset OFF and encode at most LEN bytes.
7862 Return the number of bytes placed in the buffer, or zero upon failure. */
7865 native_encode_expr (const_tree expr
, unsigned char *ptr
, int len
, int off
)
7867 /* We don't support starting at negative offset and -1 is special. */
7871 switch (TREE_CODE (expr
))
7874 return native_encode_int (expr
, ptr
, len
, off
);
7877 return native_encode_real (expr
, ptr
, len
, off
);
7880 return native_encode_fixed (expr
, ptr
, len
, off
);
7883 return native_encode_complex (expr
, ptr
, len
, off
);
7886 return native_encode_vector (expr
, ptr
, len
, off
);
7889 return native_encode_string (expr
, ptr
, len
, off
);
7896 /* Similar to native_encode_expr, but also handle CONSTRUCTORs, VCEs,
7897 NON_LVALUE_EXPRs and nops. */
7900 native_encode_initializer (tree init
, unsigned char *ptr
, int len
,
7903 /* We don't support starting at negative offset and -1 is special. */
7904 if (off
< -1 || init
== NULL_TREE
)
7908 switch (TREE_CODE (init
))
7910 case VIEW_CONVERT_EXPR
:
7911 case NON_LVALUE_EXPR
:
7912 return native_encode_initializer (TREE_OPERAND (init
, 0), ptr
, len
, off
);
7914 return native_encode_expr (init
, ptr
, len
, off
);
7916 tree type
= TREE_TYPE (init
);
7917 HOST_WIDE_INT total_bytes
= int_size_in_bytes (type
);
7918 if (total_bytes
< 0)
7920 if ((off
== -1 && total_bytes
> len
) || off
>= total_bytes
)
7922 int o
= off
== -1 ? 0 : off
;
7923 if (TREE_CODE (type
) == ARRAY_TYPE
)
7925 HOST_WIDE_INT min_index
;
7926 unsigned HOST_WIDE_INT cnt
;
7927 HOST_WIDE_INT curpos
= 0, fieldsize
;
7928 constructor_elt
*ce
;
7930 if (TYPE_DOMAIN (type
) == NULL_TREE
7931 || !tree_fits_shwi_p (TYPE_MIN_VALUE (TYPE_DOMAIN (type
))))
7934 fieldsize
= int_size_in_bytes (TREE_TYPE (type
));
7938 min_index
= tree_to_shwi (TYPE_MIN_VALUE (TYPE_DOMAIN (type
)));
7940 memset (ptr
, '\0', MIN (total_bytes
- off
, len
));
7942 FOR_EACH_VEC_SAFE_ELT (CONSTRUCTOR_ELTS (init
), cnt
, ce
)
7944 tree val
= ce
->value
;
7945 tree index
= ce
->index
;
7946 HOST_WIDE_INT pos
= curpos
, count
= 0;
7948 if (index
&& TREE_CODE (index
) == RANGE_EXPR
)
7950 if (!tree_fits_shwi_p (TREE_OPERAND (index
, 0))
7951 || !tree_fits_shwi_p (TREE_OPERAND (index
, 1)))
7953 pos
= (tree_to_shwi (TREE_OPERAND (index
, 0)) - min_index
)
7955 count
= (tree_to_shwi (TREE_OPERAND (index
, 1))
7956 - tree_to_shwi (TREE_OPERAND (index
, 0)));
7960 if (!tree_fits_shwi_p (index
))
7962 pos
= (tree_to_shwi (index
) - min_index
) * fieldsize
;
7971 && (curpos
+ fieldsize
7972 <= (HOST_WIDE_INT
) off
+ len
)))
7977 memcpy (ptr
+ (curpos
- o
), ptr
+ (pos
- o
),
7980 else if (!native_encode_initializer (val
,
7994 else if (curpos
+ fieldsize
> off
7995 && curpos
< (HOST_WIDE_INT
) off
+ len
)
7997 /* Partial overlap. */
7998 unsigned char *p
= NULL
;
8004 p
= ptr
+ curpos
- off
;
8005 l
= MIN ((HOST_WIDE_INT
) off
+ len
- curpos
,
8014 if (!native_encode_initializer (val
, p
, l
, no
))
8017 curpos
+= fieldsize
;
8019 while (count
-- != 0);
8021 return MIN (total_bytes
- off
, len
);
8023 else if (TREE_CODE (type
) == RECORD_TYPE
8024 || TREE_CODE (type
) == UNION_TYPE
)
8026 unsigned HOST_WIDE_INT cnt
;
8027 constructor_elt
*ce
;
8030 memset (ptr
, '\0', MIN (total_bytes
- off
, len
));
8031 FOR_EACH_VEC_SAFE_ELT (CONSTRUCTOR_ELTS (init
), cnt
, ce
)
8033 tree field
= ce
->index
;
8034 tree val
= ce
->value
;
8035 HOST_WIDE_INT pos
, fieldsize
;
8037 if (field
== NULL_TREE
)
8040 pos
= int_byte_position (field
);
8041 if (off
!= -1 && (HOST_WIDE_INT
) off
+ len
<= pos
)
8044 if (TREE_CODE (TREE_TYPE (field
)) == ARRAY_TYPE
8045 && TYPE_DOMAIN (TREE_TYPE (field
))
8046 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (field
))))
8048 if (DECL_SIZE_UNIT (field
) == NULL_TREE
8049 || !tree_fits_shwi_p (DECL_SIZE_UNIT (field
)))
8051 fieldsize
= tree_to_shwi (DECL_SIZE_UNIT (field
));
8055 if (off
!= -1 && pos
+ fieldsize
<= off
)
8058 if (DECL_BIT_FIELD (field
))
8061 if (val
== NULL_TREE
)
8066 && (pos
+ fieldsize
<= (HOST_WIDE_INT
) off
+ len
)))
8068 if (!native_encode_initializer (val
, ptr
? ptr
+ pos
- o
8071 off
== -1 ? -1 : 0))
8076 /* Partial overlap. */
8077 unsigned char *p
= NULL
;
8083 p
= ptr
+ pos
- off
;
8084 l
= MIN ((HOST_WIDE_INT
) off
+ len
- pos
,
8093 if (!native_encode_initializer (val
, p
, l
, no
))
8097 return MIN (total_bytes
- off
, len
);
8104 /* Subroutine of native_interpret_expr. Interpret the contents of
8105 the buffer PTR of length LEN as an INTEGER_CST of type TYPE.
8106 If the buffer cannot be interpreted, return NULL_TREE. */
8109 native_interpret_int (tree type
, const unsigned char *ptr
, int len
)
8111 int total_bytes
= GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (type
));
8113 if (total_bytes
> len
8114 || total_bytes
* BITS_PER_UNIT
> HOST_BITS_PER_DOUBLE_INT
)
8117 wide_int result
= wi::from_buffer (ptr
, total_bytes
);
8119 return wide_int_to_tree (type
, result
);
8123 /* Subroutine of native_interpret_expr. Interpret the contents of
8124 the buffer PTR of length LEN as a FIXED_CST of type TYPE.
8125 If the buffer cannot be interpreted, return NULL_TREE. */
8128 native_interpret_fixed (tree type
, const unsigned char *ptr
, int len
)
8130 scalar_mode mode
= SCALAR_TYPE_MODE (type
);
8131 int total_bytes
= GET_MODE_SIZE (mode
);
8133 FIXED_VALUE_TYPE fixed_value
;
8135 if (total_bytes
> len
8136 || total_bytes
* BITS_PER_UNIT
> HOST_BITS_PER_DOUBLE_INT
)
8139 result
= double_int::from_buffer (ptr
, total_bytes
);
8140 fixed_value
= fixed_from_double_int (result
, mode
);
8142 return build_fixed (type
, fixed_value
);
8146 /* Subroutine of native_interpret_expr. Interpret the contents of
8147 the buffer PTR of length LEN as a REAL_CST of type TYPE.
8148 If the buffer cannot be interpreted, return NULL_TREE. */
8151 native_interpret_real (tree type
, const unsigned char *ptr
, int len
)
8153 scalar_float_mode mode
= SCALAR_FLOAT_TYPE_MODE (type
);
8154 int total_bytes
= GET_MODE_SIZE (mode
);
8155 unsigned char value
;
8156 /* There are always 32 bits in each long, no matter the size of
8157 the hosts long. We handle floating point representations with
8162 if (total_bytes
> len
|| total_bytes
> 24)
8164 int words
= (32 / BITS_PER_UNIT
) / UNITS_PER_WORD
;
8166 memset (tmp
, 0, sizeof (tmp
));
8167 for (int bitpos
= 0; bitpos
< total_bytes
* BITS_PER_UNIT
;
8168 bitpos
+= BITS_PER_UNIT
)
8170 /* Both OFFSET and BYTE index within a long;
8171 bitpos indexes the whole float. */
8172 int offset
, byte
= (bitpos
/ BITS_PER_UNIT
) & 3;
8173 if (UNITS_PER_WORD
< 4)
8175 int word
= byte
/ UNITS_PER_WORD
;
8176 if (WORDS_BIG_ENDIAN
)
8177 word
= (words
- 1) - word
;
8178 offset
= word
* UNITS_PER_WORD
;
8179 if (BYTES_BIG_ENDIAN
)
8180 offset
+= (UNITS_PER_WORD
- 1) - (byte
% UNITS_PER_WORD
);
8182 offset
+= byte
% UNITS_PER_WORD
;
8187 if (BYTES_BIG_ENDIAN
)
8189 /* Reverse bytes within each long, or within the entire float
8190 if it's smaller than a long (for HFmode). */
8191 offset
= MIN (3, total_bytes
- 1) - offset
;
8192 gcc_assert (offset
>= 0);
8195 value
= ptr
[offset
+ ((bitpos
/ BITS_PER_UNIT
) & ~3)];
8197 tmp
[bitpos
/ 32] |= (unsigned long)value
<< (bitpos
& 31);
8200 real_from_target (&r
, tmp
, mode
);
8201 return build_real (type
, r
);
8205 /* Subroutine of native_interpret_expr. Interpret the contents of
8206 the buffer PTR of length LEN as a COMPLEX_CST of type TYPE.
8207 If the buffer cannot be interpreted, return NULL_TREE. */
8210 native_interpret_complex (tree type
, const unsigned char *ptr
, int len
)
8212 tree etype
, rpart
, ipart
;
8215 etype
= TREE_TYPE (type
);
8216 size
= GET_MODE_SIZE (SCALAR_TYPE_MODE (etype
));
8219 rpart
= native_interpret_expr (etype
, ptr
, size
);
8222 ipart
= native_interpret_expr (etype
, ptr
+size
, size
);
8225 return build_complex (type
, rpart
, ipart
);
8228 /* Read a vector of type TYPE from the target memory image given by BYTES,
8229 which contains LEN bytes. The vector is known to be encodable using
8230 NPATTERNS interleaved patterns with NELTS_PER_PATTERN elements each.
8232 Return the vector on success, otherwise return null. */
8235 native_interpret_vector_part (tree type
, const unsigned char *bytes
,
8236 unsigned int len
, unsigned int npatterns
,
8237 unsigned int nelts_per_pattern
)
8239 tree elt_type
= TREE_TYPE (type
);
8240 if (VECTOR_BOOLEAN_TYPE_P (type
)
8241 && TYPE_PRECISION (elt_type
) <= BITS_PER_UNIT
)
8243 /* This is the only case in which elements can be smaller than a byte.
8244 Element 0 is always in the lsb of the containing byte. */
8245 unsigned int elt_bits
= TYPE_PRECISION (elt_type
);
8246 if (elt_bits
* npatterns
* nelts_per_pattern
> len
* BITS_PER_UNIT
)
8249 tree_vector_builder
builder (type
, npatterns
, nelts_per_pattern
);
8250 for (unsigned int i
= 0; i
< builder
.encoded_nelts (); ++i
)
8252 unsigned int bit_index
= i
* elt_bits
;
8253 unsigned int byte_index
= bit_index
/ BITS_PER_UNIT
;
8254 unsigned int lsb
= bit_index
% BITS_PER_UNIT
;
8255 builder
.quick_push (bytes
[byte_index
] & (1 << lsb
)
8256 ? build_all_ones_cst (elt_type
)
8257 : build_zero_cst (elt_type
));
8259 return builder
.build ();
8262 unsigned int elt_bytes
= tree_to_uhwi (TYPE_SIZE_UNIT (elt_type
));
8263 if (elt_bytes
* npatterns
* nelts_per_pattern
> len
)
8266 tree_vector_builder
builder (type
, npatterns
, nelts_per_pattern
);
8267 for (unsigned int i
= 0; i
< builder
.encoded_nelts (); ++i
)
8269 tree elt
= native_interpret_expr (elt_type
, bytes
, elt_bytes
);
8272 builder
.quick_push (elt
);
8275 return builder
.build ();
8278 /* Subroutine of native_interpret_expr. Interpret the contents of
8279 the buffer PTR of length LEN as a VECTOR_CST of type TYPE.
8280 If the buffer cannot be interpreted, return NULL_TREE. */
8283 native_interpret_vector (tree type
, const unsigned char *ptr
, unsigned int len
)
8287 unsigned HOST_WIDE_INT count
;
8289 etype
= TREE_TYPE (type
);
8290 size
= GET_MODE_SIZE (SCALAR_TYPE_MODE (etype
));
8291 if (!TYPE_VECTOR_SUBPARTS (type
).is_constant (&count
)
8292 || size
* count
> len
)
8295 return native_interpret_vector_part (type
, ptr
, len
, count
, 1);
8299 /* Subroutine of fold_view_convert_expr. Interpret the contents of
8300 the buffer PTR of length LEN as a constant of type TYPE. For
8301 INTEGRAL_TYPE_P we return an INTEGER_CST, for SCALAR_FLOAT_TYPE_P
8302 we return a REAL_CST, etc... If the buffer cannot be interpreted,
8303 return NULL_TREE. */
8306 native_interpret_expr (tree type
, const unsigned char *ptr
, int len
)
8308 switch (TREE_CODE (type
))
8314 case REFERENCE_TYPE
:
8315 return native_interpret_int (type
, ptr
, len
);
8318 return native_interpret_real (type
, ptr
, len
);
8320 case FIXED_POINT_TYPE
:
8321 return native_interpret_fixed (type
, ptr
, len
);
8324 return native_interpret_complex (type
, ptr
, len
);
8327 return native_interpret_vector (type
, ptr
, len
);
8334 /* Returns true if we can interpret the contents of a native encoding
8338 can_native_interpret_type_p (tree type
)
8340 switch (TREE_CODE (type
))
8346 case REFERENCE_TYPE
:
8347 case FIXED_POINT_TYPE
:
8357 /* Routines for manipulation of native_encode_expr encoded data if the encoded
8358 or extracted constant positions and/or sizes aren't byte aligned. */
8360 /* Shift left the bytes in PTR of SZ elements by AMNT bits, carrying over the
8361 bits between adjacent elements. AMNT should be within
8364 00011111|11100000 << 2 = 01111111|10000000
8365 PTR[1] | PTR[0] PTR[1] | PTR[0]. */
8368 shift_bytes_in_array_left (unsigned char *ptr
, unsigned int sz
,
8374 unsigned char carry_over
= 0U;
8375 unsigned char carry_mask
= (~0U) << (unsigned char) (BITS_PER_UNIT
- amnt
);
8376 unsigned char clear_mask
= (~0U) << amnt
;
8378 for (unsigned int i
= 0; i
< sz
; i
++)
8380 unsigned prev_carry_over
= carry_over
;
8381 carry_over
= (ptr
[i
] & carry_mask
) >> (BITS_PER_UNIT
- amnt
);
8386 ptr
[i
] &= clear_mask
;
8387 ptr
[i
] |= prev_carry_over
;
8392 /* Like shift_bytes_in_array_left but for big-endian.
8393 Shift right the bytes in PTR of SZ elements by AMNT bits, carrying over the
8394 bits between adjacent elements. AMNT should be within
8397 00011111|11100000 >> 2 = 00000111|11111000
8398 PTR[0] | PTR[1] PTR[0] | PTR[1]. */
8401 shift_bytes_in_array_right (unsigned char *ptr
, unsigned int sz
,
8407 unsigned char carry_over
= 0U;
8408 unsigned char carry_mask
= ~(~0U << amnt
);
8410 for (unsigned int i
= 0; i
< sz
; i
++)
8412 unsigned prev_carry_over
= carry_over
;
8413 carry_over
= ptr
[i
] & carry_mask
;
8415 carry_over
<<= (unsigned char) BITS_PER_UNIT
- amnt
;
8417 ptr
[i
] |= prev_carry_over
;
8421 /* Try to view-convert VECTOR_CST EXPR to VECTOR_TYPE TYPE by operating
8422 directly on the VECTOR_CST encoding, in a way that works for variable-
8423 length vectors. Return the resulting VECTOR_CST on success or null
8427 fold_view_convert_vector_encoding (tree type
, tree expr
)
8429 tree expr_type
= TREE_TYPE (expr
);
8430 poly_uint64 type_bits
, expr_bits
;
8431 if (!poly_int_tree_p (TYPE_SIZE (type
), &type_bits
)
8432 || !poly_int_tree_p (TYPE_SIZE (expr_type
), &expr_bits
))
8435 poly_uint64 type_units
= TYPE_VECTOR_SUBPARTS (type
);
8436 poly_uint64 expr_units
= TYPE_VECTOR_SUBPARTS (expr_type
);
8437 unsigned int type_elt_bits
= vector_element_size (type_bits
, type_units
);
8438 unsigned int expr_elt_bits
= vector_element_size (expr_bits
, expr_units
);
8440 /* We can only preserve the semantics of a stepped pattern if the new
8441 vector element is an integer of the same size. */
8442 if (VECTOR_CST_STEPPED_P (expr
)
8443 && (!INTEGRAL_TYPE_P (type
) || type_elt_bits
!= expr_elt_bits
))
8446 /* The number of bits needed to encode one element from every pattern
8447 of the original vector. */
8448 unsigned int expr_sequence_bits
8449 = VECTOR_CST_NPATTERNS (expr
) * expr_elt_bits
;
8451 /* The number of bits needed to encode one element from every pattern
8453 unsigned int type_sequence_bits
8454 = least_common_multiple (expr_sequence_bits
, type_elt_bits
);
8456 /* Don't try to read more bytes than are available, which can happen
8457 for constant-sized vectors if TYPE has larger elements than EXPR_TYPE.
8458 The general VIEW_CONVERT handling can cope with that case, so there's
8459 no point complicating things here. */
8460 unsigned int nelts_per_pattern
= VECTOR_CST_NELTS_PER_PATTERN (expr
);
8461 unsigned int buffer_bytes
= CEIL (nelts_per_pattern
* type_sequence_bits
,
8463 unsigned int buffer_bits
= buffer_bytes
* BITS_PER_UNIT
;
8464 if (known_gt (buffer_bits
, expr_bits
))
8467 /* Get enough bytes of EXPR to form the new encoding. */
8468 auto_vec
<unsigned char, 128> buffer (buffer_bytes
);
8469 buffer
.quick_grow (buffer_bytes
);
8470 if (native_encode_vector_part (expr
, buffer
.address (), buffer_bytes
, 0,
8471 buffer_bits
/ expr_elt_bits
)
8472 != (int) buffer_bytes
)
8475 /* Reencode the bytes as TYPE. */
8476 unsigned int type_npatterns
= type_sequence_bits
/ type_elt_bits
;
8477 return native_interpret_vector_part (type
, &buffer
[0], buffer
.length (),
8478 type_npatterns
, nelts_per_pattern
);
8481 /* Fold a VIEW_CONVERT_EXPR of a constant expression EXPR to type
8482 TYPE at compile-time. If we're unable to perform the conversion
8483 return NULL_TREE. */
8486 fold_view_convert_expr (tree type
, tree expr
)
8488 /* We support up to 512-bit values (for V8DFmode). */
8489 unsigned char buffer
[64];
8492 /* Check that the host and target are sane. */
8493 if (CHAR_BIT
!= 8 || BITS_PER_UNIT
!= 8)
8496 if (VECTOR_TYPE_P (type
) && TREE_CODE (expr
) == VECTOR_CST
)
8497 if (tree res
= fold_view_convert_vector_encoding (type
, expr
))
8500 len
= native_encode_expr (expr
, buffer
, sizeof (buffer
));
8504 return native_interpret_expr (type
, buffer
, len
);
8507 /* Build an expression for the address of T. Folds away INDIRECT_REF
8508 to avoid confusing the gimplify process. */
8511 build_fold_addr_expr_with_type_loc (location_t loc
, tree t
, tree ptrtype
)
8513 /* The size of the object is not relevant when talking about its address. */
8514 if (TREE_CODE (t
) == WITH_SIZE_EXPR
)
8515 t
= TREE_OPERAND (t
, 0);
8517 if (TREE_CODE (t
) == INDIRECT_REF
)
8519 t
= TREE_OPERAND (t
, 0);
8521 if (TREE_TYPE (t
) != ptrtype
)
8522 t
= build1_loc (loc
, NOP_EXPR
, ptrtype
, t
);
8524 else if (TREE_CODE (t
) == MEM_REF
8525 && integer_zerop (TREE_OPERAND (t
, 1)))
8527 t
= TREE_OPERAND (t
, 0);
8529 if (TREE_TYPE (t
) != ptrtype
)
8530 t
= fold_convert_loc (loc
, ptrtype
, t
);
8532 else if (TREE_CODE (t
) == MEM_REF
8533 && TREE_CODE (TREE_OPERAND (t
, 0)) == INTEGER_CST
)
8534 return fold_binary (POINTER_PLUS_EXPR
, ptrtype
,
8535 TREE_OPERAND (t
, 0),
8536 convert_to_ptrofftype (TREE_OPERAND (t
, 1)));
8537 else if (TREE_CODE (t
) == VIEW_CONVERT_EXPR
)
8539 t
= build_fold_addr_expr_loc (loc
, TREE_OPERAND (t
, 0));
8541 if (TREE_TYPE (t
) != ptrtype
)
8542 t
= fold_convert_loc (loc
, ptrtype
, t
);
8545 t
= build1_loc (loc
, ADDR_EXPR
, ptrtype
, t
);
8550 /* Build an expression for the address of T. */
8553 build_fold_addr_expr_loc (location_t loc
, tree t
)
8555 tree ptrtype
= build_pointer_type (TREE_TYPE (t
));
8557 return build_fold_addr_expr_with_type_loc (loc
, t
, ptrtype
);
8560 /* Fold a unary expression of code CODE and type TYPE with operand
8561 OP0. Return the folded expression if folding is successful.
8562 Otherwise, return NULL_TREE. */
8565 fold_unary_loc (location_t loc
, enum tree_code code
, tree type
, tree op0
)
8569 enum tree_code_class kind
= TREE_CODE_CLASS (code
);
8571 gcc_assert (IS_EXPR_CODE_CLASS (kind
)
8572 && TREE_CODE_LENGTH (code
) == 1);
8577 if (CONVERT_EXPR_CODE_P (code
)
8578 || code
== FLOAT_EXPR
|| code
== ABS_EXPR
|| code
== NEGATE_EXPR
)
8580 /* Don't use STRIP_NOPS, because signedness of argument type
8582 STRIP_SIGN_NOPS (arg0
);
8586 /* Strip any conversions that don't change the mode. This
8587 is safe for every expression, except for a comparison
8588 expression because its signedness is derived from its
8591 Note that this is done as an internal manipulation within
8592 the constant folder, in order to find the simplest
8593 representation of the arguments so that their form can be
8594 studied. In any cases, the appropriate type conversions
8595 should be put back in the tree that will get out of the
8600 if (CONSTANT_CLASS_P (arg0
))
8602 tree tem
= const_unop (code
, type
, arg0
);
8605 if (TREE_TYPE (tem
) != type
)
8606 tem
= fold_convert_loc (loc
, type
, tem
);
8612 tem
= generic_simplify (loc
, code
, type
, op0
);
8616 if (TREE_CODE_CLASS (code
) == tcc_unary
)
8618 if (TREE_CODE (arg0
) == COMPOUND_EXPR
)
8619 return build2 (COMPOUND_EXPR
, type
, TREE_OPERAND (arg0
, 0),
8620 fold_build1_loc (loc
, code
, type
,
8621 fold_convert_loc (loc
, TREE_TYPE (op0
),
8622 TREE_OPERAND (arg0
, 1))));
8623 else if (TREE_CODE (arg0
) == COND_EXPR
)
8625 tree arg01
= TREE_OPERAND (arg0
, 1);
8626 tree arg02
= TREE_OPERAND (arg0
, 2);
8627 if (! VOID_TYPE_P (TREE_TYPE (arg01
)))
8628 arg01
= fold_build1_loc (loc
, code
, type
,
8629 fold_convert_loc (loc
,
8630 TREE_TYPE (op0
), arg01
));
8631 if (! VOID_TYPE_P (TREE_TYPE (arg02
)))
8632 arg02
= fold_build1_loc (loc
, code
, type
,
8633 fold_convert_loc (loc
,
8634 TREE_TYPE (op0
), arg02
));
8635 tem
= fold_build3_loc (loc
, COND_EXPR
, type
, TREE_OPERAND (arg0
, 0),
8638 /* If this was a conversion, and all we did was to move into
8639 inside the COND_EXPR, bring it back out. But leave it if
8640 it is a conversion from integer to integer and the
8641 result precision is no wider than a word since such a
8642 conversion is cheap and may be optimized away by combine,
8643 while it couldn't if it were outside the COND_EXPR. Then return
8644 so we don't get into an infinite recursion loop taking the
8645 conversion out and then back in. */
8647 if ((CONVERT_EXPR_CODE_P (code
)
8648 || code
== NON_LVALUE_EXPR
)
8649 && TREE_CODE (tem
) == COND_EXPR
8650 && TREE_CODE (TREE_OPERAND (tem
, 1)) == code
8651 && TREE_CODE (TREE_OPERAND (tem
, 2)) == code
8652 && ! VOID_TYPE_P (TREE_OPERAND (tem
, 1))
8653 && ! VOID_TYPE_P (TREE_OPERAND (tem
, 2))
8654 && (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (tem
, 1), 0))
8655 == TREE_TYPE (TREE_OPERAND (TREE_OPERAND (tem
, 2), 0)))
8656 && (! (INTEGRAL_TYPE_P (TREE_TYPE (tem
))
8658 (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (tem
, 1), 0))))
8659 && TYPE_PRECISION (TREE_TYPE (tem
)) <= BITS_PER_WORD
)
8660 || flag_syntax_only
))
8661 tem
= build1_loc (loc
, code
, type
,
8663 TREE_TYPE (TREE_OPERAND
8664 (TREE_OPERAND (tem
, 1), 0)),
8665 TREE_OPERAND (tem
, 0),
8666 TREE_OPERAND (TREE_OPERAND (tem
, 1), 0),
8667 TREE_OPERAND (TREE_OPERAND (tem
, 2),
8675 case NON_LVALUE_EXPR
:
8676 if (!maybe_lvalue_p (op0
))
8677 return fold_convert_loc (loc
, type
, op0
);
8682 case FIX_TRUNC_EXPR
:
8683 if (COMPARISON_CLASS_P (op0
))
8685 /* If we have (type) (a CMP b) and type is an integral type, return
8686 new expression involving the new type. Canonicalize
8687 (type) (a CMP b) to (a CMP b) ? (type) true : (type) false for
8689 Do not fold the result as that would not simplify further, also
8690 folding again results in recursions. */
8691 if (TREE_CODE (type
) == BOOLEAN_TYPE
)
8692 return build2_loc (loc
, TREE_CODE (op0
), type
,
8693 TREE_OPERAND (op0
, 0),
8694 TREE_OPERAND (op0
, 1));
8695 else if (!INTEGRAL_TYPE_P (type
) && !VOID_TYPE_P (type
)
8696 && TREE_CODE (type
) != VECTOR_TYPE
)
8697 return build3_loc (loc
, COND_EXPR
, type
, op0
,
8698 constant_boolean_node (true, type
),
8699 constant_boolean_node (false, type
));
8702 /* Handle (T *)&A.B.C for A being of type T and B and C
8703 living at offset zero. This occurs frequently in
8704 C++ upcasting and then accessing the base. */
8705 if (TREE_CODE (op0
) == ADDR_EXPR
8706 && POINTER_TYPE_P (type
)
8707 && handled_component_p (TREE_OPERAND (op0
, 0)))
8709 poly_int64 bitsize
, bitpos
;
8712 int unsignedp
, reversep
, volatilep
;
8714 = get_inner_reference (TREE_OPERAND (op0
, 0), &bitsize
, &bitpos
,
8715 &offset
, &mode
, &unsignedp
, &reversep
,
8717 /* If the reference was to a (constant) zero offset, we can use
8718 the address of the base if it has the same base type
8719 as the result type and the pointer type is unqualified. */
8721 && known_eq (bitpos
, 0)
8722 && (TYPE_MAIN_VARIANT (TREE_TYPE (type
))
8723 == TYPE_MAIN_VARIANT (TREE_TYPE (base
)))
8724 && TYPE_QUALS (type
) == TYPE_UNQUALIFIED
)
8725 return fold_convert_loc (loc
, type
,
8726 build_fold_addr_expr_loc (loc
, base
));
8729 if (TREE_CODE (op0
) == MODIFY_EXPR
8730 && TREE_CONSTANT (TREE_OPERAND (op0
, 1))
8731 /* Detect assigning a bitfield. */
8732 && !(TREE_CODE (TREE_OPERAND (op0
, 0)) == COMPONENT_REF
8734 (TREE_OPERAND (TREE_OPERAND (op0
, 0), 1))))
8736 /* Don't leave an assignment inside a conversion
8737 unless assigning a bitfield. */
8738 tem
= fold_build1_loc (loc
, code
, type
, TREE_OPERAND (op0
, 1));
8739 /* First do the assignment, then return converted constant. */
8740 tem
= build2_loc (loc
, COMPOUND_EXPR
, TREE_TYPE (tem
), op0
, tem
);
8741 TREE_NO_WARNING (tem
) = 1;
8742 TREE_USED (tem
) = 1;
8746 /* Convert (T)(x & c) into (T)x & (T)c, if c is an integer
8747 constants (if x has signed type, the sign bit cannot be set
8748 in c). This folds extension into the BIT_AND_EXPR.
8749 ??? We don't do it for BOOLEAN_TYPE or ENUMERAL_TYPE because they
8750 very likely don't have maximal range for their precision and this
8751 transformation effectively doesn't preserve non-maximal ranges. */
8752 if (TREE_CODE (type
) == INTEGER_TYPE
8753 && TREE_CODE (op0
) == BIT_AND_EXPR
8754 && TREE_CODE (TREE_OPERAND (op0
, 1)) == INTEGER_CST
)
8756 tree and_expr
= op0
;
8757 tree and0
= TREE_OPERAND (and_expr
, 0);
8758 tree and1
= TREE_OPERAND (and_expr
, 1);
8761 if (TYPE_UNSIGNED (TREE_TYPE (and_expr
))
8762 || (TYPE_PRECISION (type
)
8763 <= TYPE_PRECISION (TREE_TYPE (and_expr
))))
8765 else if (TYPE_PRECISION (TREE_TYPE (and1
))
8766 <= HOST_BITS_PER_WIDE_INT
8767 && tree_fits_uhwi_p (and1
))
8769 unsigned HOST_WIDE_INT cst
;
8771 cst
= tree_to_uhwi (and1
);
8772 cst
&= HOST_WIDE_INT_M1U
8773 << (TYPE_PRECISION (TREE_TYPE (and1
)) - 1);
8774 change
= (cst
== 0);
8776 && !flag_syntax_only
8777 && (load_extend_op (TYPE_MODE (TREE_TYPE (and0
)))
8780 tree uns
= unsigned_type_for (TREE_TYPE (and0
));
8781 and0
= fold_convert_loc (loc
, uns
, and0
);
8782 and1
= fold_convert_loc (loc
, uns
, and1
);
8787 tem
= force_fit_type (type
, wi::to_widest (and1
), 0,
8788 TREE_OVERFLOW (and1
));
8789 return fold_build2_loc (loc
, BIT_AND_EXPR
, type
,
8790 fold_convert_loc (loc
, type
, and0
), tem
);
8794 /* Convert (T1)(X p+ Y) into ((T1)X p+ Y), for pointer type, when the new
8795 cast (T1)X will fold away. We assume that this happens when X itself
8797 if (POINTER_TYPE_P (type
)
8798 && TREE_CODE (arg0
) == POINTER_PLUS_EXPR
8799 && CONVERT_EXPR_P (TREE_OPERAND (arg0
, 0)))
8801 tree arg00
= TREE_OPERAND (arg0
, 0);
8802 tree arg01
= TREE_OPERAND (arg0
, 1);
8804 return fold_build_pointer_plus_loc
8805 (loc
, fold_convert_loc (loc
, type
, arg00
), arg01
);
8808 /* Convert (T1)(~(T2)X) into ~(T1)X if T1 and T2 are integral types
8809 of the same precision, and X is an integer type not narrower than
8810 types T1 or T2, i.e. the cast (T2)X isn't an extension. */
8811 if (INTEGRAL_TYPE_P (type
)
8812 && TREE_CODE (op0
) == BIT_NOT_EXPR
8813 && INTEGRAL_TYPE_P (TREE_TYPE (op0
))
8814 && CONVERT_EXPR_P (TREE_OPERAND (op0
, 0))
8815 && TYPE_PRECISION (type
) == TYPE_PRECISION (TREE_TYPE (op0
)))
8817 tem
= TREE_OPERAND (TREE_OPERAND (op0
, 0), 0);
8818 if (INTEGRAL_TYPE_P (TREE_TYPE (tem
))
8819 && TYPE_PRECISION (type
) <= TYPE_PRECISION (TREE_TYPE (tem
)))
8820 return fold_build1_loc (loc
, BIT_NOT_EXPR
, type
,
8821 fold_convert_loc (loc
, type
, tem
));
8824 /* Convert (T1)(X * Y) into (T1)X * (T1)Y if T1 is narrower than the
8825 type of X and Y (integer types only). */
8826 if (INTEGRAL_TYPE_P (type
)
8827 && TREE_CODE (op0
) == MULT_EXPR
8828 && INTEGRAL_TYPE_P (TREE_TYPE (op0
))
8829 && TYPE_PRECISION (type
) < TYPE_PRECISION (TREE_TYPE (op0
)))
8831 /* Be careful not to introduce new overflows. */
8833 if (TYPE_OVERFLOW_WRAPS (type
))
8836 mult_type
= unsigned_type_for (type
);
8838 if (TYPE_PRECISION (mult_type
) < TYPE_PRECISION (TREE_TYPE (op0
)))
8840 tem
= fold_build2_loc (loc
, MULT_EXPR
, mult_type
,
8841 fold_convert_loc (loc
, mult_type
,
8842 TREE_OPERAND (op0
, 0)),
8843 fold_convert_loc (loc
, mult_type
,
8844 TREE_OPERAND (op0
, 1)));
8845 return fold_convert_loc (loc
, type
, tem
);
8851 case VIEW_CONVERT_EXPR
:
8852 if (TREE_CODE (op0
) == MEM_REF
)
8854 if (TYPE_ALIGN (TREE_TYPE (op0
)) != TYPE_ALIGN (type
))
8855 type
= build_aligned_type (type
, TYPE_ALIGN (TREE_TYPE (op0
)));
8856 tem
= fold_build2_loc (loc
, MEM_REF
, type
,
8857 TREE_OPERAND (op0
, 0), TREE_OPERAND (op0
, 1));
8858 REF_REVERSE_STORAGE_ORDER (tem
) = REF_REVERSE_STORAGE_ORDER (op0
);
8865 tem
= fold_negate_expr (loc
, arg0
);
8867 return fold_convert_loc (loc
, type
, tem
);
8871 /* Convert fabs((double)float) into (double)fabsf(float). */
8872 if (TREE_CODE (arg0
) == NOP_EXPR
8873 && TREE_CODE (type
) == REAL_TYPE
)
8875 tree targ0
= strip_float_extensions (arg0
);
8877 return fold_convert_loc (loc
, type
,
8878 fold_build1_loc (loc
, ABS_EXPR
,
8885 /* Convert ~(X ^ Y) to ~X ^ Y or X ^ ~Y if ~X or ~Y simplify. */
8886 if (TREE_CODE (arg0
) == BIT_XOR_EXPR
8887 && (tem
= fold_unary_loc (loc
, BIT_NOT_EXPR
, type
,
8888 fold_convert_loc (loc
, type
,
8889 TREE_OPERAND (arg0
, 0)))))
8890 return fold_build2_loc (loc
, BIT_XOR_EXPR
, type
, tem
,
8891 fold_convert_loc (loc
, type
,
8892 TREE_OPERAND (arg0
, 1)));
8893 else if (TREE_CODE (arg0
) == BIT_XOR_EXPR
8894 && (tem
= fold_unary_loc (loc
, BIT_NOT_EXPR
, type
,
8895 fold_convert_loc (loc
, type
,
8896 TREE_OPERAND (arg0
, 1)))))
8897 return fold_build2_loc (loc
, BIT_XOR_EXPR
, type
,
8898 fold_convert_loc (loc
, type
,
8899 TREE_OPERAND (arg0
, 0)), tem
);
8903 case TRUTH_NOT_EXPR
:
8904 /* Note that the operand of this must be an int
8905 and its values must be 0 or 1.
8906 ("true" is a fixed value perhaps depending on the language,
8907 but we don't handle values other than 1 correctly yet.) */
8908 tem
= fold_truth_not_expr (loc
, arg0
);
8911 return fold_convert_loc (loc
, type
, tem
);
8914 /* Fold *&X to X if X is an lvalue. */
8915 if (TREE_CODE (op0
) == ADDR_EXPR
)
8917 tree op00
= TREE_OPERAND (op0
, 0);
8919 || TREE_CODE (op00
) == PARM_DECL
8920 || TREE_CODE (op00
) == RESULT_DECL
)
8921 && !TREE_READONLY (op00
))
8928 } /* switch (code) */
8932 /* If the operation was a conversion do _not_ mark a resulting constant
8933 with TREE_OVERFLOW if the original constant was not. These conversions
8934 have implementation defined behavior and retaining the TREE_OVERFLOW
8935 flag here would confuse later passes such as VRP. */
8937 fold_unary_ignore_overflow_loc (location_t loc
, enum tree_code code
,
8938 tree type
, tree op0
)
8940 tree res
= fold_unary_loc (loc
, code
, type
, op0
);
8942 && TREE_CODE (res
) == INTEGER_CST
8943 && TREE_CODE (op0
) == INTEGER_CST
8944 && CONVERT_EXPR_CODE_P (code
))
8945 TREE_OVERFLOW (res
) = TREE_OVERFLOW (op0
);
8950 /* Fold a binary bitwise/truth expression of code CODE and type TYPE with
8951 operands OP0 and OP1. LOC is the location of the resulting expression.
8952 ARG0 and ARG1 are the NOP_STRIPed results of OP0 and OP1.
8953 Return the folded expression if folding is successful. Otherwise,
8954 return NULL_TREE. */
8956 fold_truth_andor (location_t loc
, enum tree_code code
, tree type
,
8957 tree arg0
, tree arg1
, tree op0
, tree op1
)
8961 /* We only do these simplifications if we are optimizing. */
8965 /* Check for things like (A || B) && (A || C). We can convert this
8966 to A || (B && C). Note that either operator can be any of the four
8967 truth and/or operations and the transformation will still be
8968 valid. Also note that we only care about order for the
8969 ANDIF and ORIF operators. If B contains side effects, this
8970 might change the truth-value of A. */
8971 if (TREE_CODE (arg0
) == TREE_CODE (arg1
)
8972 && (TREE_CODE (arg0
) == TRUTH_ANDIF_EXPR
8973 || TREE_CODE (arg0
) == TRUTH_ORIF_EXPR
8974 || TREE_CODE (arg0
) == TRUTH_AND_EXPR
8975 || TREE_CODE (arg0
) == TRUTH_OR_EXPR
)
8976 && ! TREE_SIDE_EFFECTS (TREE_OPERAND (arg0
, 1)))
8978 tree a00
= TREE_OPERAND (arg0
, 0);
8979 tree a01
= TREE_OPERAND (arg0
, 1);
8980 tree a10
= TREE_OPERAND (arg1
, 0);
8981 tree a11
= TREE_OPERAND (arg1
, 1);
8982 int commutative
= ((TREE_CODE (arg0
) == TRUTH_OR_EXPR
8983 || TREE_CODE (arg0
) == TRUTH_AND_EXPR
)
8984 && (code
== TRUTH_AND_EXPR
8985 || code
== TRUTH_OR_EXPR
));
8987 if (operand_equal_p (a00
, a10
, 0))
8988 return fold_build2_loc (loc
, TREE_CODE (arg0
), type
, a00
,
8989 fold_build2_loc (loc
, code
, type
, a01
, a11
));
8990 else if (commutative
&& operand_equal_p (a00
, a11
, 0))
8991 return fold_build2_loc (loc
, TREE_CODE (arg0
), type
, a00
,
8992 fold_build2_loc (loc
, code
, type
, a01
, a10
));
8993 else if (commutative
&& operand_equal_p (a01
, a10
, 0))
8994 return fold_build2_loc (loc
, TREE_CODE (arg0
), type
, a01
,
8995 fold_build2_loc (loc
, code
, type
, a00
, a11
));
8997 /* This case if tricky because we must either have commutative
8998 operators or else A10 must not have side-effects. */
9000 else if ((commutative
|| ! TREE_SIDE_EFFECTS (a10
))
9001 && operand_equal_p (a01
, a11
, 0))
9002 return fold_build2_loc (loc
, TREE_CODE (arg0
), type
,
9003 fold_build2_loc (loc
, code
, type
, a00
, a10
),
9007 /* See if we can build a range comparison. */
9008 if ((tem
= fold_range_test (loc
, code
, type
, op0
, op1
)) != 0)
9011 if ((code
== TRUTH_ANDIF_EXPR
&& TREE_CODE (arg0
) == TRUTH_ORIF_EXPR
)
9012 || (code
== TRUTH_ORIF_EXPR
&& TREE_CODE (arg0
) == TRUTH_ANDIF_EXPR
))
9014 tem
= merge_truthop_with_opposite_arm (loc
, arg0
, arg1
, true);
9016 return fold_build2_loc (loc
, code
, type
, tem
, arg1
);
9019 if ((code
== TRUTH_ANDIF_EXPR
&& TREE_CODE (arg1
) == TRUTH_ORIF_EXPR
)
9020 || (code
== TRUTH_ORIF_EXPR
&& TREE_CODE (arg1
) == TRUTH_ANDIF_EXPR
))
9022 tem
= merge_truthop_with_opposite_arm (loc
, arg1
, arg0
, false);
9024 return fold_build2_loc (loc
, code
, type
, arg0
, tem
);
9027 /* Check for the possibility of merging component references. If our
9028 lhs is another similar operation, try to merge its rhs with our
9029 rhs. Then try to merge our lhs and rhs. */
9030 if (TREE_CODE (arg0
) == code
9031 && (tem
= fold_truth_andor_1 (loc
, code
, type
,
9032 TREE_OPERAND (arg0
, 1), arg1
)) != 0)
9033 return fold_build2_loc (loc
, code
, type
, TREE_OPERAND (arg0
, 0), tem
);
9035 if ((tem
= fold_truth_andor_1 (loc
, code
, type
, arg0
, arg1
)) != 0)
9038 bool logical_op_non_short_circuit
= LOGICAL_OP_NON_SHORT_CIRCUIT
;
9039 if (param_logical_op_non_short_circuit
!= -1)
9040 logical_op_non_short_circuit
9041 = param_logical_op_non_short_circuit
;
9042 if (logical_op_non_short_circuit
9043 && !flag_sanitize_coverage
9044 && (code
== TRUTH_AND_EXPR
9045 || code
== TRUTH_ANDIF_EXPR
9046 || code
== TRUTH_OR_EXPR
9047 || code
== TRUTH_ORIF_EXPR
))
9049 enum tree_code ncode
, icode
;
9051 ncode
= (code
== TRUTH_ANDIF_EXPR
|| code
== TRUTH_AND_EXPR
)
9052 ? TRUTH_AND_EXPR
: TRUTH_OR_EXPR
;
9053 icode
= ncode
== TRUTH_AND_EXPR
? TRUTH_ANDIF_EXPR
: TRUTH_ORIF_EXPR
;
9055 /* Transform ((A AND-IF B) AND[-IF] C) into (A AND-IF (B AND C)),
9056 or ((A OR-IF B) OR[-IF] C) into (A OR-IF (B OR C))
9057 We don't want to pack more than two leafs to a non-IF AND/OR
9059 If tree-code of left-hand operand isn't an AND/OR-IF code and not
9060 equal to IF-CODE, then we don't want to add right-hand operand.
9061 If the inner right-hand side of left-hand operand has
9062 side-effects, or isn't simple, then we can't add to it,
9063 as otherwise we might destroy if-sequence. */
9064 if (TREE_CODE (arg0
) == icode
9065 && simple_operand_p_2 (arg1
)
9066 /* Needed for sequence points to handle trappings, and
9068 && simple_operand_p_2 (TREE_OPERAND (arg0
, 1)))
9070 tem
= fold_build2_loc (loc
, ncode
, type
, TREE_OPERAND (arg0
, 1),
9072 return fold_build2_loc (loc
, icode
, type
, TREE_OPERAND (arg0
, 0),
9075 /* Same as above but for (A AND[-IF] (B AND-IF C)) -> ((A AND B) AND-IF C),
9076 or (A OR[-IF] (B OR-IF C) -> ((A OR B) OR-IF C). */
9077 else if (TREE_CODE (arg1
) == icode
9078 && simple_operand_p_2 (arg0
)
9079 /* Needed for sequence points to handle trappings, and
9081 && simple_operand_p_2 (TREE_OPERAND (arg1
, 0)))
9083 tem
= fold_build2_loc (loc
, ncode
, type
,
9084 arg0
, TREE_OPERAND (arg1
, 0));
9085 return fold_build2_loc (loc
, icode
, type
, tem
,
9086 TREE_OPERAND (arg1
, 1));
9088 /* Transform (A AND-IF B) into (A AND B), or (A OR-IF B)
9090 For sequence point consistancy, we need to check for trapping,
9091 and side-effects. */
9092 else if (code
== icode
&& simple_operand_p_2 (arg0
)
9093 && simple_operand_p_2 (arg1
))
9094 return fold_build2_loc (loc
, ncode
, type
, arg0
, arg1
);
9100 /* Helper that tries to canonicalize the comparison ARG0 CODE ARG1
9101 by changing CODE to reduce the magnitude of constants involved in
9102 ARG0 of the comparison.
9103 Returns a canonicalized comparison tree if a simplification was
9104 possible, otherwise returns NULL_TREE.
9105 Set *STRICT_OVERFLOW_P to true if the canonicalization is only
9106 valid if signed overflow is undefined. */
9109 maybe_canonicalize_comparison_1 (location_t loc
, enum tree_code code
, tree type
,
9110 tree arg0
, tree arg1
,
9111 bool *strict_overflow_p
)
9113 enum tree_code code0
= TREE_CODE (arg0
);
9114 tree t
, cst0
= NULL_TREE
;
9117 /* Match A +- CST code arg1. We can change this only if overflow
9119 if (!((ANY_INTEGRAL_TYPE_P (TREE_TYPE (arg0
))
9120 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg0
)))
9121 /* In principle pointers also have undefined overflow behavior,
9122 but that causes problems elsewhere. */
9123 && !POINTER_TYPE_P (TREE_TYPE (arg0
))
9124 && (code0
== MINUS_EXPR
9125 || code0
== PLUS_EXPR
)
9126 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
))
9129 /* Identify the constant in arg0 and its sign. */
9130 cst0
= TREE_OPERAND (arg0
, 1);
9131 sgn0
= tree_int_cst_sgn (cst0
);
9133 /* Overflowed constants and zero will cause problems. */
9134 if (integer_zerop (cst0
)
9135 || TREE_OVERFLOW (cst0
))
9138 /* See if we can reduce the magnitude of the constant in
9139 arg0 by changing the comparison code. */
9140 /* A - CST < arg1 -> A - CST-1 <= arg1. */
9142 && code0
== ((sgn0
== -1) ? PLUS_EXPR
: MINUS_EXPR
))
9144 /* A + CST > arg1 -> A + CST-1 >= arg1. */
9145 else if (code
== GT_EXPR
9146 && code0
== ((sgn0
== -1) ? MINUS_EXPR
: PLUS_EXPR
))
9148 /* A + CST <= arg1 -> A + CST-1 < arg1. */
9149 else if (code
== LE_EXPR
9150 && code0
== ((sgn0
== -1) ? MINUS_EXPR
: PLUS_EXPR
))
9152 /* A - CST >= arg1 -> A - CST-1 > arg1. */
9153 else if (code
== GE_EXPR
9154 && code0
== ((sgn0
== -1) ? PLUS_EXPR
: MINUS_EXPR
))
9158 *strict_overflow_p
= true;
9160 /* Now build the constant reduced in magnitude. But not if that
9161 would produce one outside of its types range. */
9162 if (INTEGRAL_TYPE_P (TREE_TYPE (cst0
))
9164 && TYPE_MIN_VALUE (TREE_TYPE (cst0
))
9165 && tree_int_cst_equal (cst0
, TYPE_MIN_VALUE (TREE_TYPE (cst0
))))
9167 && TYPE_MAX_VALUE (TREE_TYPE (cst0
))
9168 && tree_int_cst_equal (cst0
, TYPE_MAX_VALUE (TREE_TYPE (cst0
))))))
9171 t
= int_const_binop (sgn0
== -1 ? PLUS_EXPR
: MINUS_EXPR
,
9172 cst0
, build_int_cst (TREE_TYPE (cst0
), 1));
9173 t
= fold_build2_loc (loc
, code0
, TREE_TYPE (arg0
), TREE_OPERAND (arg0
, 0), t
);
9174 t
= fold_convert (TREE_TYPE (arg1
), t
);
9176 return fold_build2_loc (loc
, code
, type
, t
, arg1
);
9179 /* Canonicalize the comparison ARG0 CODE ARG1 with type TYPE with undefined
9180 overflow further. Try to decrease the magnitude of constants involved
9181 by changing LE_EXPR and GE_EXPR to LT_EXPR and GT_EXPR or vice versa
9182 and put sole constants at the second argument position.
9183 Returns the canonicalized tree if changed, otherwise NULL_TREE. */
9186 maybe_canonicalize_comparison (location_t loc
, enum tree_code code
, tree type
,
9187 tree arg0
, tree arg1
)
9190 bool strict_overflow_p
;
9191 const char * const warnmsg
= G_("assuming signed overflow does not occur "
9192 "when reducing constant in comparison");
9194 /* Try canonicalization by simplifying arg0. */
9195 strict_overflow_p
= false;
9196 t
= maybe_canonicalize_comparison_1 (loc
, code
, type
, arg0
, arg1
,
9197 &strict_overflow_p
);
9200 if (strict_overflow_p
)
9201 fold_overflow_warning (warnmsg
, WARN_STRICT_OVERFLOW_MAGNITUDE
);
9205 /* Try canonicalization by simplifying arg1 using the swapped
9207 code
= swap_tree_comparison (code
);
9208 strict_overflow_p
= false;
9209 t
= maybe_canonicalize_comparison_1 (loc
, code
, type
, arg1
, arg0
,
9210 &strict_overflow_p
);
9211 if (t
&& strict_overflow_p
)
9212 fold_overflow_warning (warnmsg
, WARN_STRICT_OVERFLOW_MAGNITUDE
);
9216 /* Return whether BASE + OFFSET + BITPOS may wrap around the address
9217 space. This is used to avoid issuing overflow warnings for
9218 expressions like &p->x which cannot wrap. */
9221 pointer_may_wrap_p (tree base
, tree offset
, poly_int64 bitpos
)
9223 if (!POINTER_TYPE_P (TREE_TYPE (base
)))
9226 if (maybe_lt (bitpos
, 0))
9229 poly_wide_int wi_offset
;
9230 int precision
= TYPE_PRECISION (TREE_TYPE (base
));
9231 if (offset
== NULL_TREE
)
9232 wi_offset
= wi::zero (precision
);
9233 else if (!poly_int_tree_p (offset
) || TREE_OVERFLOW (offset
))
9236 wi_offset
= wi::to_poly_wide (offset
);
9238 wi::overflow_type overflow
;
9239 poly_wide_int units
= wi::shwi (bits_to_bytes_round_down (bitpos
),
9241 poly_wide_int total
= wi::add (wi_offset
, units
, UNSIGNED
, &overflow
);
9245 poly_uint64 total_hwi
, size
;
9246 if (!total
.to_uhwi (&total_hwi
)
9247 || !poly_int_tree_p (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (base
))),
9249 || known_eq (size
, 0U))
9252 if (known_le (total_hwi
, size
))
9255 /* We can do slightly better for SIZE if we have an ADDR_EXPR of an
9257 if (TREE_CODE (base
) == ADDR_EXPR
9258 && poly_int_tree_p (TYPE_SIZE_UNIT (TREE_TYPE (TREE_OPERAND (base
, 0))),
9260 && maybe_ne (size
, 0U)
9261 && known_le (total_hwi
, size
))
9267 /* Return a positive integer when the symbol DECL is known to have
9268 a nonzero address, zero when it's known not to (e.g., it's a weak
9269 symbol), and a negative integer when the symbol is not yet in the
9270 symbol table and so whether or not its address is zero is unknown.
9271 For function local objects always return positive integer. */
9273 maybe_nonzero_address (tree decl
)
9275 if (DECL_P (decl
) && decl_in_symtab_p (decl
))
9276 if (struct symtab_node
*symbol
= symtab_node::get_create (decl
))
9277 return symbol
->nonzero_address ();
9279 /* Function local objects are never NULL. */
9281 && (DECL_CONTEXT (decl
)
9282 && TREE_CODE (DECL_CONTEXT (decl
)) == FUNCTION_DECL
9283 && auto_var_in_fn_p (decl
, DECL_CONTEXT (decl
))))
9289 /* Subroutine of fold_binary. This routine performs all of the
9290 transformations that are common to the equality/inequality
9291 operators (EQ_EXPR and NE_EXPR) and the ordering operators
9292 (LT_EXPR, LE_EXPR, GE_EXPR and GT_EXPR). Callers other than
9293 fold_binary should call fold_binary. Fold a comparison with
9294 tree code CODE and type TYPE with operands OP0 and OP1. Return
9295 the folded comparison or NULL_TREE. */
9298 fold_comparison (location_t loc
, enum tree_code code
, tree type
,
9301 const bool equality_code
= (code
== EQ_EXPR
|| code
== NE_EXPR
);
9302 tree arg0
, arg1
, tem
;
9307 STRIP_SIGN_NOPS (arg0
);
9308 STRIP_SIGN_NOPS (arg1
);
9310 /* For comparisons of pointers we can decompose it to a compile time
9311 comparison of the base objects and the offsets into the object.
9312 This requires at least one operand being an ADDR_EXPR or a
9313 POINTER_PLUS_EXPR to do more than the operand_equal_p test below. */
9314 if (POINTER_TYPE_P (TREE_TYPE (arg0
))
9315 && (TREE_CODE (arg0
) == ADDR_EXPR
9316 || TREE_CODE (arg1
) == ADDR_EXPR
9317 || TREE_CODE (arg0
) == POINTER_PLUS_EXPR
9318 || TREE_CODE (arg1
) == POINTER_PLUS_EXPR
))
9320 tree base0
, base1
, offset0
= NULL_TREE
, offset1
= NULL_TREE
;
9321 poly_int64 bitsize
, bitpos0
= 0, bitpos1
= 0;
9323 int volatilep
, reversep
, unsignedp
;
9324 bool indirect_base0
= false, indirect_base1
= false;
9326 /* Get base and offset for the access. Strip ADDR_EXPR for
9327 get_inner_reference, but put it back by stripping INDIRECT_REF
9328 off the base object if possible. indirect_baseN will be true
9329 if baseN is not an address but refers to the object itself. */
9331 if (TREE_CODE (arg0
) == ADDR_EXPR
)
9334 = get_inner_reference (TREE_OPERAND (arg0
, 0),
9335 &bitsize
, &bitpos0
, &offset0
, &mode
,
9336 &unsignedp
, &reversep
, &volatilep
);
9337 if (TREE_CODE (base0
) == INDIRECT_REF
)
9338 base0
= TREE_OPERAND (base0
, 0);
9340 indirect_base0
= true;
9342 else if (TREE_CODE (arg0
) == POINTER_PLUS_EXPR
)
9344 base0
= TREE_OPERAND (arg0
, 0);
9345 STRIP_SIGN_NOPS (base0
);
9346 if (TREE_CODE (base0
) == ADDR_EXPR
)
9349 = get_inner_reference (TREE_OPERAND (base0
, 0),
9350 &bitsize
, &bitpos0
, &offset0
, &mode
,
9351 &unsignedp
, &reversep
, &volatilep
);
9352 if (TREE_CODE (base0
) == INDIRECT_REF
)
9353 base0
= TREE_OPERAND (base0
, 0);
9355 indirect_base0
= true;
9357 if (offset0
== NULL_TREE
|| integer_zerop (offset0
))
9358 offset0
= TREE_OPERAND (arg0
, 1);
9360 offset0
= size_binop (PLUS_EXPR
, offset0
,
9361 TREE_OPERAND (arg0
, 1));
9362 if (poly_int_tree_p (offset0
))
9364 poly_offset_int tem
= wi::sext (wi::to_poly_offset (offset0
),
9365 TYPE_PRECISION (sizetype
));
9366 tem
<<= LOG2_BITS_PER_UNIT
;
9368 if (tem
.to_shwi (&bitpos0
))
9369 offset0
= NULL_TREE
;
9374 if (TREE_CODE (arg1
) == ADDR_EXPR
)
9377 = get_inner_reference (TREE_OPERAND (arg1
, 0),
9378 &bitsize
, &bitpos1
, &offset1
, &mode
,
9379 &unsignedp
, &reversep
, &volatilep
);
9380 if (TREE_CODE (base1
) == INDIRECT_REF
)
9381 base1
= TREE_OPERAND (base1
, 0);
9383 indirect_base1
= true;
9385 else if (TREE_CODE (arg1
) == POINTER_PLUS_EXPR
)
9387 base1
= TREE_OPERAND (arg1
, 0);
9388 STRIP_SIGN_NOPS (base1
);
9389 if (TREE_CODE (base1
) == ADDR_EXPR
)
9392 = get_inner_reference (TREE_OPERAND (base1
, 0),
9393 &bitsize
, &bitpos1
, &offset1
, &mode
,
9394 &unsignedp
, &reversep
, &volatilep
);
9395 if (TREE_CODE (base1
) == INDIRECT_REF
)
9396 base1
= TREE_OPERAND (base1
, 0);
9398 indirect_base1
= true;
9400 if (offset1
== NULL_TREE
|| integer_zerop (offset1
))
9401 offset1
= TREE_OPERAND (arg1
, 1);
9403 offset1
= size_binop (PLUS_EXPR
, offset1
,
9404 TREE_OPERAND (arg1
, 1));
9405 if (poly_int_tree_p (offset1
))
9407 poly_offset_int tem
= wi::sext (wi::to_poly_offset (offset1
),
9408 TYPE_PRECISION (sizetype
));
9409 tem
<<= LOG2_BITS_PER_UNIT
;
9411 if (tem
.to_shwi (&bitpos1
))
9412 offset1
= NULL_TREE
;
9416 /* If we have equivalent bases we might be able to simplify. */
9417 if (indirect_base0
== indirect_base1
9418 && operand_equal_p (base0
, base1
,
9419 indirect_base0
? OEP_ADDRESS_OF
: 0))
9421 /* We can fold this expression to a constant if the non-constant
9422 offset parts are equal. */
9423 if ((offset0
== offset1
9424 || (offset0
&& offset1
9425 && operand_equal_p (offset0
, offset1
, 0)))
9428 && (DECL_P (base0
) || CONSTANT_CLASS_P (base0
)))
9429 || TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg0
))))
9432 && maybe_ne (bitpos0
, bitpos1
)
9433 && (pointer_may_wrap_p (base0
, offset0
, bitpos0
)
9434 || pointer_may_wrap_p (base1
, offset1
, bitpos1
)))
9435 fold_overflow_warning (("assuming pointer wraparound does not "
9436 "occur when comparing P +- C1 with "
9438 WARN_STRICT_OVERFLOW_CONDITIONAL
);
9443 if (known_eq (bitpos0
, bitpos1
))
9444 return constant_boolean_node (true, type
);
9445 if (known_ne (bitpos0
, bitpos1
))
9446 return constant_boolean_node (false, type
);
9449 if (known_ne (bitpos0
, bitpos1
))
9450 return constant_boolean_node (true, type
);
9451 if (known_eq (bitpos0
, bitpos1
))
9452 return constant_boolean_node (false, type
);
9455 if (known_lt (bitpos0
, bitpos1
))
9456 return constant_boolean_node (true, type
);
9457 if (known_ge (bitpos0
, bitpos1
))
9458 return constant_boolean_node (false, type
);
9461 if (known_le (bitpos0
, bitpos1
))
9462 return constant_boolean_node (true, type
);
9463 if (known_gt (bitpos0
, bitpos1
))
9464 return constant_boolean_node (false, type
);
9467 if (known_ge (bitpos0
, bitpos1
))
9468 return constant_boolean_node (true, type
);
9469 if (known_lt (bitpos0
, bitpos1
))
9470 return constant_boolean_node (false, type
);
9473 if (known_gt (bitpos0
, bitpos1
))
9474 return constant_boolean_node (true, type
);
9475 if (known_le (bitpos0
, bitpos1
))
9476 return constant_boolean_node (false, type
);
9481 /* We can simplify the comparison to a comparison of the variable
9482 offset parts if the constant offset parts are equal.
9483 Be careful to use signed sizetype here because otherwise we
9484 mess with array offsets in the wrong way. This is possible
9485 because pointer arithmetic is restricted to retain within an
9486 object and overflow on pointer differences is undefined as of
9487 6.5.6/8 and /9 with respect to the signed ptrdiff_t. */
9488 else if (known_eq (bitpos0
, bitpos1
)
9491 && (DECL_P (base0
) || CONSTANT_CLASS_P (base0
)))
9492 || TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg0
))))
9494 /* By converting to signed sizetype we cover middle-end pointer
9495 arithmetic which operates on unsigned pointer types of size
9496 type size and ARRAY_REF offsets which are properly sign or
9497 zero extended from their type in case it is narrower than
9499 if (offset0
== NULL_TREE
)
9500 offset0
= build_int_cst (ssizetype
, 0);
9502 offset0
= fold_convert_loc (loc
, ssizetype
, offset0
);
9503 if (offset1
== NULL_TREE
)
9504 offset1
= build_int_cst (ssizetype
, 0);
9506 offset1
= fold_convert_loc (loc
, ssizetype
, offset1
);
9509 && (pointer_may_wrap_p (base0
, offset0
, bitpos0
)
9510 || pointer_may_wrap_p (base1
, offset1
, bitpos1
)))
9511 fold_overflow_warning (("assuming pointer wraparound does not "
9512 "occur when comparing P +- C1 with "
9514 WARN_STRICT_OVERFLOW_COMPARISON
);
9516 return fold_build2_loc (loc
, code
, type
, offset0
, offset1
);
9519 /* For equal offsets we can simplify to a comparison of the
9521 else if (known_eq (bitpos0
, bitpos1
)
9523 ? base0
!= TREE_OPERAND (arg0
, 0) : base0
!= arg0
)
9525 ? base1
!= TREE_OPERAND (arg1
, 0) : base1
!= arg1
)
9526 && ((offset0
== offset1
)
9527 || (offset0
&& offset1
9528 && operand_equal_p (offset0
, offset1
, 0))))
9531 base0
= build_fold_addr_expr_loc (loc
, base0
);
9533 base1
= build_fold_addr_expr_loc (loc
, base1
);
9534 return fold_build2_loc (loc
, code
, type
, base0
, base1
);
9536 /* Comparison between an ordinary (non-weak) symbol and a null
9537 pointer can be eliminated since such symbols must have a non
9538 null address. In C, relational expressions between pointers
9539 to objects and null pointers are undefined. The results
9540 below follow the C++ rules with the additional property that
9541 every object pointer compares greater than a null pointer.
9543 else if (((DECL_P (base0
)
9544 && maybe_nonzero_address (base0
) > 0
9545 /* Avoid folding references to struct members at offset 0 to
9546 prevent tests like '&ptr->firstmember == 0' from getting
9547 eliminated. When ptr is null, although the -> expression
9548 is strictly speaking invalid, GCC retains it as a matter
9549 of QoI. See PR c/44555. */
9550 && (offset0
== NULL_TREE
&& known_ne (bitpos0
, 0)))
9551 || CONSTANT_CLASS_P (base0
))
9553 /* The caller guarantees that when one of the arguments is
9554 constant (i.e., null in this case) it is second. */
9555 && integer_zerop (arg1
))
9562 return constant_boolean_node (false, type
);
9566 return constant_boolean_node (true, type
);
9573 /* Transform comparisons of the form X +- C1 CMP Y +- C2 to
9574 X CMP Y +- C2 +- C1 for signed X, Y. This is valid if
9575 the resulting offset is smaller in absolute value than the
9576 original one and has the same sign. */
9577 if (ANY_INTEGRAL_TYPE_P (TREE_TYPE (arg0
))
9578 && TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg0
))
9579 && (TREE_CODE (arg0
) == PLUS_EXPR
|| TREE_CODE (arg0
) == MINUS_EXPR
)
9580 && (TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
9581 && !TREE_OVERFLOW (TREE_OPERAND (arg0
, 1)))
9582 && (TREE_CODE (arg1
) == PLUS_EXPR
|| TREE_CODE (arg1
) == MINUS_EXPR
)
9583 && (TREE_CODE (TREE_OPERAND (arg1
, 1)) == INTEGER_CST
9584 && !TREE_OVERFLOW (TREE_OPERAND (arg1
, 1))))
9586 tree const1
= TREE_OPERAND (arg0
, 1);
9587 tree const2
= TREE_OPERAND (arg1
, 1);
9588 tree variable1
= TREE_OPERAND (arg0
, 0);
9589 tree variable2
= TREE_OPERAND (arg1
, 0);
9591 const char * const warnmsg
= G_("assuming signed overflow does not "
9592 "occur when combining constants around "
9595 /* Put the constant on the side where it doesn't overflow and is
9596 of lower absolute value and of same sign than before. */
9597 cst
= int_const_binop (TREE_CODE (arg0
) == TREE_CODE (arg1
)
9598 ? MINUS_EXPR
: PLUS_EXPR
,
9600 if (!TREE_OVERFLOW (cst
)
9601 && tree_int_cst_compare (const2
, cst
) == tree_int_cst_sgn (const2
)
9602 && tree_int_cst_sgn (cst
) == tree_int_cst_sgn (const2
))
9604 fold_overflow_warning (warnmsg
, WARN_STRICT_OVERFLOW_COMPARISON
);
9605 return fold_build2_loc (loc
, code
, type
,
9607 fold_build2_loc (loc
, TREE_CODE (arg1
),
9612 cst
= int_const_binop (TREE_CODE (arg0
) == TREE_CODE (arg1
)
9613 ? MINUS_EXPR
: PLUS_EXPR
,
9615 if (!TREE_OVERFLOW (cst
)
9616 && tree_int_cst_compare (const1
, cst
) == tree_int_cst_sgn (const1
)
9617 && tree_int_cst_sgn (cst
) == tree_int_cst_sgn (const1
))
9619 fold_overflow_warning (warnmsg
, WARN_STRICT_OVERFLOW_COMPARISON
);
9620 return fold_build2_loc (loc
, code
, type
,
9621 fold_build2_loc (loc
, TREE_CODE (arg0
),
9628 tem
= maybe_canonicalize_comparison (loc
, code
, type
, arg0
, arg1
);
9632 /* If we are comparing an expression that just has comparisons
9633 of two integer values, arithmetic expressions of those comparisons,
9634 and constants, we can simplify it. There are only three cases
9635 to check: the two values can either be equal, the first can be
9636 greater, or the second can be greater. Fold the expression for
9637 those three values. Since each value must be 0 or 1, we have
9638 eight possibilities, each of which corresponds to the constant 0
9639 or 1 or one of the six possible comparisons.
9641 This handles common cases like (a > b) == 0 but also handles
9642 expressions like ((x > y) - (y > x)) > 0, which supposedly
9643 occur in macroized code. */
9645 if (TREE_CODE (arg1
) == INTEGER_CST
&& TREE_CODE (arg0
) != INTEGER_CST
)
9647 tree cval1
= 0, cval2
= 0;
9649 if (twoval_comparison_p (arg0
, &cval1
, &cval2
)
9650 /* Don't handle degenerate cases here; they should already
9651 have been handled anyway. */
9652 && cval1
!= 0 && cval2
!= 0
9653 && ! (TREE_CONSTANT (cval1
) && TREE_CONSTANT (cval2
))
9654 && TREE_TYPE (cval1
) == TREE_TYPE (cval2
)
9655 && INTEGRAL_TYPE_P (TREE_TYPE (cval1
))
9656 && TYPE_MAX_VALUE (TREE_TYPE (cval1
))
9657 && TYPE_MAX_VALUE (TREE_TYPE (cval2
))
9658 && ! operand_equal_p (TYPE_MIN_VALUE (TREE_TYPE (cval1
)),
9659 TYPE_MAX_VALUE (TREE_TYPE (cval2
)), 0))
9661 tree maxval
= TYPE_MAX_VALUE (TREE_TYPE (cval1
));
9662 tree minval
= TYPE_MIN_VALUE (TREE_TYPE (cval1
));
9664 /* We can't just pass T to eval_subst in case cval1 or cval2
9665 was the same as ARG1. */
9668 = fold_build2_loc (loc
, code
, type
,
9669 eval_subst (loc
, arg0
, cval1
, maxval
,
9673 = fold_build2_loc (loc
, code
, type
,
9674 eval_subst (loc
, arg0
, cval1
, maxval
,
9678 = fold_build2_loc (loc
, code
, type
,
9679 eval_subst (loc
, arg0
, cval1
, minval
,
9683 /* All three of these results should be 0 or 1. Confirm they are.
9684 Then use those values to select the proper code to use. */
9686 if (TREE_CODE (high_result
) == INTEGER_CST
9687 && TREE_CODE (equal_result
) == INTEGER_CST
9688 && TREE_CODE (low_result
) == INTEGER_CST
)
9690 /* Make a 3-bit mask with the high-order bit being the
9691 value for `>', the next for '=', and the low for '<'. */
9692 switch ((integer_onep (high_result
) * 4)
9693 + (integer_onep (equal_result
) * 2)
9694 + integer_onep (low_result
))
9698 return omit_one_operand_loc (loc
, type
, integer_zero_node
, arg0
);
9719 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg0
);
9722 return fold_build2_loc (loc
, code
, type
, cval1
, cval2
);
9731 /* Subroutine of fold_binary. Optimize complex multiplications of the
9732 form z * conj(z), as pow(realpart(z),2) + pow(imagpart(z),2). The
9733 argument EXPR represents the expression "z" of type TYPE. */
9736 fold_mult_zconjz (location_t loc
, tree type
, tree expr
)
9738 tree itype
= TREE_TYPE (type
);
9739 tree rpart
, ipart
, tem
;
9741 if (TREE_CODE (expr
) == COMPLEX_EXPR
)
9743 rpart
= TREE_OPERAND (expr
, 0);
9744 ipart
= TREE_OPERAND (expr
, 1);
9746 else if (TREE_CODE (expr
) == COMPLEX_CST
)
9748 rpart
= TREE_REALPART (expr
);
9749 ipart
= TREE_IMAGPART (expr
);
9753 expr
= save_expr (expr
);
9754 rpart
= fold_build1_loc (loc
, REALPART_EXPR
, itype
, expr
);
9755 ipart
= fold_build1_loc (loc
, IMAGPART_EXPR
, itype
, expr
);
9758 rpart
= save_expr (rpart
);
9759 ipart
= save_expr (ipart
);
9760 tem
= fold_build2_loc (loc
, PLUS_EXPR
, itype
,
9761 fold_build2_loc (loc
, MULT_EXPR
, itype
, rpart
, rpart
),
9762 fold_build2_loc (loc
, MULT_EXPR
, itype
, ipart
, ipart
));
9763 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
, tem
,
9764 build_zero_cst (itype
));
9768 /* Helper function for fold_vec_perm. Store elements of VECTOR_CST or
9769 CONSTRUCTOR ARG into array ELTS, which has NELTS elements, and return
9770 true if successful. */
9773 vec_cst_ctor_to_array (tree arg
, unsigned int nelts
, tree
*elts
)
9775 unsigned HOST_WIDE_INT i
, nunits
;
9777 if (TREE_CODE (arg
) == VECTOR_CST
9778 && VECTOR_CST_NELTS (arg
).is_constant (&nunits
))
9780 for (i
= 0; i
< nunits
; ++i
)
9781 elts
[i
] = VECTOR_CST_ELT (arg
, i
);
9783 else if (TREE_CODE (arg
) == CONSTRUCTOR
)
9785 constructor_elt
*elt
;
9787 FOR_EACH_VEC_SAFE_ELT (CONSTRUCTOR_ELTS (arg
), i
, elt
)
9788 if (i
>= nelts
|| TREE_CODE (TREE_TYPE (elt
->value
)) == VECTOR_TYPE
)
9791 elts
[i
] = elt
->value
;
9795 for (; i
< nelts
; i
++)
9797 = fold_convert (TREE_TYPE (TREE_TYPE (arg
)), integer_zero_node
);
9801 /* Attempt to fold vector permutation of ARG0 and ARG1 vectors using SEL
9802 selector. Return the folded VECTOR_CST or CONSTRUCTOR if successful,
9803 NULL_TREE otherwise. */
9806 fold_vec_perm (tree type
, tree arg0
, tree arg1
, const vec_perm_indices
&sel
)
9809 unsigned HOST_WIDE_INT nelts
;
9810 bool need_ctor
= false;
9812 if (!sel
.length ().is_constant (&nelts
))
9814 gcc_assert (known_eq (TYPE_VECTOR_SUBPARTS (type
), nelts
)
9815 && known_eq (TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg0
)), nelts
)
9816 && known_eq (TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg1
)), nelts
));
9817 if (TREE_TYPE (TREE_TYPE (arg0
)) != TREE_TYPE (type
)
9818 || TREE_TYPE (TREE_TYPE (arg1
)) != TREE_TYPE (type
))
9821 tree
*in_elts
= XALLOCAVEC (tree
, nelts
* 2);
9822 if (!vec_cst_ctor_to_array (arg0
, nelts
, in_elts
)
9823 || !vec_cst_ctor_to_array (arg1
, nelts
, in_elts
+ nelts
))
9826 tree_vector_builder
out_elts (type
, nelts
, 1);
9827 for (i
= 0; i
< nelts
; i
++)
9829 HOST_WIDE_INT index
;
9830 if (!sel
[i
].is_constant (&index
))
9832 if (!CONSTANT_CLASS_P (in_elts
[index
]))
9834 out_elts
.quick_push (unshare_expr (in_elts
[index
]));
9839 vec
<constructor_elt
, va_gc
> *v
;
9840 vec_alloc (v
, nelts
);
9841 for (i
= 0; i
< nelts
; i
++)
9842 CONSTRUCTOR_APPEND_ELT (v
, NULL_TREE
, out_elts
[i
]);
9843 return build_constructor (type
, v
);
9846 return out_elts
.build ();
9849 /* Try to fold a pointer difference of type TYPE two address expressions of
9850 array references AREF0 and AREF1 using location LOC. Return a
9851 simplified expression for the difference or NULL_TREE. */
9854 fold_addr_of_array_ref_difference (location_t loc
, tree type
,
9855 tree aref0
, tree aref1
,
9856 bool use_pointer_diff
)
9858 tree base0
= TREE_OPERAND (aref0
, 0);
9859 tree base1
= TREE_OPERAND (aref1
, 0);
9860 tree base_offset
= build_int_cst (type
, 0);
9862 /* If the bases are array references as well, recurse. If the bases
9863 are pointer indirections compute the difference of the pointers.
9864 If the bases are equal, we are set. */
9865 if ((TREE_CODE (base0
) == ARRAY_REF
9866 && TREE_CODE (base1
) == ARRAY_REF
9868 = fold_addr_of_array_ref_difference (loc
, type
, base0
, base1
,
9870 || (INDIRECT_REF_P (base0
)
9871 && INDIRECT_REF_P (base1
)
9874 ? fold_binary_loc (loc
, POINTER_DIFF_EXPR
, type
,
9875 TREE_OPERAND (base0
, 0),
9876 TREE_OPERAND (base1
, 0))
9877 : fold_binary_loc (loc
, MINUS_EXPR
, type
,
9879 TREE_OPERAND (base0
, 0)),
9881 TREE_OPERAND (base1
, 0)))))
9882 || operand_equal_p (base0
, base1
, OEP_ADDRESS_OF
))
9884 tree op0
= fold_convert_loc (loc
, type
, TREE_OPERAND (aref0
, 1));
9885 tree op1
= fold_convert_loc (loc
, type
, TREE_OPERAND (aref1
, 1));
9886 tree esz
= fold_convert_loc (loc
, type
, array_ref_element_size (aref0
));
9887 tree diff
= fold_build2_loc (loc
, MINUS_EXPR
, type
, op0
, op1
);
9888 return fold_build2_loc (loc
, PLUS_EXPR
, type
,
9890 fold_build2_loc (loc
, MULT_EXPR
, type
,
9896 /* If the real or vector real constant CST of type TYPE has an exact
9897 inverse, return it, else return NULL. */
9900 exact_inverse (tree type
, tree cst
)
9906 switch (TREE_CODE (cst
))
9909 r
= TREE_REAL_CST (cst
);
9911 if (exact_real_inverse (TYPE_MODE (type
), &r
))
9912 return build_real (type
, r
);
9918 unit_type
= TREE_TYPE (type
);
9919 mode
= TYPE_MODE (unit_type
);
9921 tree_vector_builder elts
;
9922 if (!elts
.new_unary_operation (type
, cst
, false))
9924 unsigned int count
= elts
.encoded_nelts ();
9925 for (unsigned int i
= 0; i
< count
; ++i
)
9927 r
= TREE_REAL_CST (VECTOR_CST_ELT (cst
, i
));
9928 if (!exact_real_inverse (mode
, &r
))
9930 elts
.quick_push (build_real (unit_type
, r
));
9933 return elts
.build ();
9941 /* Mask out the tz least significant bits of X of type TYPE where
9942 tz is the number of trailing zeroes in Y. */
9944 mask_with_tz (tree type
, const wide_int
&x
, const wide_int
&y
)
9946 int tz
= wi::ctz (y
);
9948 return wi::mask (tz
, true, TYPE_PRECISION (type
)) & x
;
9952 /* Return true when T is an address and is known to be nonzero.
9953 For floating point we further ensure that T is not denormal.
9954 Similar logic is present in nonzero_address in rtlanal.h.
9956 If the return value is based on the assumption that signed overflow
9957 is undefined, set *STRICT_OVERFLOW_P to true; otherwise, don't
9958 change *STRICT_OVERFLOW_P. */
9961 tree_expr_nonzero_warnv_p (tree t
, bool *strict_overflow_p
)
9963 tree type
= TREE_TYPE (t
);
9964 enum tree_code code
;
9966 /* Doing something useful for floating point would need more work. */
9967 if (!INTEGRAL_TYPE_P (type
) && !POINTER_TYPE_P (type
))
9970 code
= TREE_CODE (t
);
9971 switch (TREE_CODE_CLASS (code
))
9974 return tree_unary_nonzero_warnv_p (code
, type
, TREE_OPERAND (t
, 0),
9977 case tcc_comparison
:
9978 return tree_binary_nonzero_warnv_p (code
, type
,
9979 TREE_OPERAND (t
, 0),
9980 TREE_OPERAND (t
, 1),
9983 case tcc_declaration
:
9985 return tree_single_nonzero_warnv_p (t
, strict_overflow_p
);
9993 case TRUTH_NOT_EXPR
:
9994 return tree_unary_nonzero_warnv_p (code
, type
, TREE_OPERAND (t
, 0),
9997 case TRUTH_AND_EXPR
:
9999 case TRUTH_XOR_EXPR
:
10000 return tree_binary_nonzero_warnv_p (code
, type
,
10001 TREE_OPERAND (t
, 0),
10002 TREE_OPERAND (t
, 1),
10003 strict_overflow_p
);
10010 case WITH_SIZE_EXPR
:
10012 return tree_single_nonzero_warnv_p (t
, strict_overflow_p
);
10014 case COMPOUND_EXPR
:
10017 return tree_expr_nonzero_warnv_p (TREE_OPERAND (t
, 1),
10018 strict_overflow_p
);
10021 return tree_expr_nonzero_warnv_p (TREE_OPERAND (t
, 0),
10022 strict_overflow_p
);
10026 tree fndecl
= get_callee_fndecl (t
);
10027 if (!fndecl
) return false;
10028 if (flag_delete_null_pointer_checks
&& !flag_check_new
10029 && DECL_IS_OPERATOR_NEW_P (fndecl
)
10030 && !TREE_NOTHROW (fndecl
))
10032 if (flag_delete_null_pointer_checks
10033 && lookup_attribute ("returns_nonnull",
10034 TYPE_ATTRIBUTES (TREE_TYPE (fndecl
))))
10036 return alloca_call_p (t
);
10045 /* Return true when T is an address and is known to be nonzero.
10046 Handle warnings about undefined signed overflow. */
10049 tree_expr_nonzero_p (tree t
)
10051 bool ret
, strict_overflow_p
;
10053 strict_overflow_p
= false;
10054 ret
= tree_expr_nonzero_warnv_p (t
, &strict_overflow_p
);
10055 if (strict_overflow_p
)
10056 fold_overflow_warning (("assuming signed overflow does not occur when "
10057 "determining that expression is always "
10059 WARN_STRICT_OVERFLOW_MISC
);
10063 /* Return true if T is known not to be equal to an integer W. */
10066 expr_not_equal_to (tree t
, const wide_int
&w
)
10068 wide_int min
, max
, nz
;
10069 value_range_kind rtype
;
10070 switch (TREE_CODE (t
))
10073 return wi::to_wide (t
) != w
;
10076 if (!INTEGRAL_TYPE_P (TREE_TYPE (t
)))
10078 rtype
= get_range_info (t
, &min
, &max
);
10079 if (rtype
== VR_RANGE
)
10081 if (wi::lt_p (max
, w
, TYPE_SIGN (TREE_TYPE (t
))))
10083 if (wi::lt_p (w
, min
, TYPE_SIGN (TREE_TYPE (t
))))
10086 else if (rtype
== VR_ANTI_RANGE
10087 && wi::le_p (min
, w
, TYPE_SIGN (TREE_TYPE (t
)))
10088 && wi::le_p (w
, max
, TYPE_SIGN (TREE_TYPE (t
))))
10090 /* If T has some known zero bits and W has any of those bits set,
10091 then T is known not to be equal to W. */
10092 if (wi::ne_p (wi::zext (wi::bit_and_not (w
, get_nonzero_bits (t
)),
10093 TYPE_PRECISION (TREE_TYPE (t
))), 0))
10102 /* Fold a binary expression of code CODE and type TYPE with operands
10103 OP0 and OP1. LOC is the location of the resulting expression.
10104 Return the folded expression if folding is successful. Otherwise,
10105 return NULL_TREE. */
10108 fold_binary_loc (location_t loc
, enum tree_code code
, tree type
,
10109 tree op0
, tree op1
)
10111 enum tree_code_class kind
= TREE_CODE_CLASS (code
);
10112 tree arg0
, arg1
, tem
;
10113 tree t1
= NULL_TREE
;
10114 bool strict_overflow_p
;
10117 gcc_assert (IS_EXPR_CODE_CLASS (kind
)
10118 && TREE_CODE_LENGTH (code
) == 2
10119 && op0
!= NULL_TREE
10120 && op1
!= NULL_TREE
);
10125 /* Strip any conversions that don't change the mode. This is
10126 safe for every expression, except for a comparison expression
10127 because its signedness is derived from its operands. So, in
10128 the latter case, only strip conversions that don't change the
10129 signedness. MIN_EXPR/MAX_EXPR also need signedness of arguments
10132 Note that this is done as an internal manipulation within the
10133 constant folder, in order to find the simplest representation
10134 of the arguments so that their form can be studied. In any
10135 cases, the appropriate type conversions should be put back in
10136 the tree that will get out of the constant folder. */
10138 if (kind
== tcc_comparison
|| code
== MIN_EXPR
|| code
== MAX_EXPR
)
10140 STRIP_SIGN_NOPS (arg0
);
10141 STRIP_SIGN_NOPS (arg1
);
10149 /* Note that TREE_CONSTANT isn't enough: static var addresses are
10150 constant but we can't do arithmetic on them. */
10151 if (CONSTANT_CLASS_P (arg0
) && CONSTANT_CLASS_P (arg1
))
10153 tem
= const_binop (code
, type
, arg0
, arg1
);
10154 if (tem
!= NULL_TREE
)
10156 if (TREE_TYPE (tem
) != type
)
10157 tem
= fold_convert_loc (loc
, type
, tem
);
10162 /* If this is a commutative operation, and ARG0 is a constant, move it
10163 to ARG1 to reduce the number of tests below. */
10164 if (commutative_tree_code (code
)
10165 && tree_swap_operands_p (arg0
, arg1
))
10166 return fold_build2_loc (loc
, code
, type
, op1
, op0
);
10168 /* Likewise if this is a comparison, and ARG0 is a constant, move it
10169 to ARG1 to reduce the number of tests below. */
10170 if (kind
== tcc_comparison
10171 && tree_swap_operands_p (arg0
, arg1
))
10172 return fold_build2_loc (loc
, swap_tree_comparison (code
), type
, op1
, op0
);
10174 tem
= generic_simplify (loc
, code
, type
, op0
, op1
);
10178 /* ARG0 is the first operand of EXPR, and ARG1 is the second operand.
10180 First check for cases where an arithmetic operation is applied to a
10181 compound, conditional, or comparison operation. Push the arithmetic
10182 operation inside the compound or conditional to see if any folding
10183 can then be done. Convert comparison to conditional for this purpose.
10184 The also optimizes non-constant cases that used to be done in
10187 Before we do that, see if this is a BIT_AND_EXPR or a BIT_IOR_EXPR,
10188 one of the operands is a comparison and the other is a comparison, a
10189 BIT_AND_EXPR with the constant 1, or a truth value. In that case, the
10190 code below would make the expression more complex. Change it to a
10191 TRUTH_{AND,OR}_EXPR. Likewise, convert a similar NE_EXPR to
10192 TRUTH_XOR_EXPR and an EQ_EXPR to the inversion of a TRUTH_XOR_EXPR. */
10194 if ((code
== BIT_AND_EXPR
|| code
== BIT_IOR_EXPR
10195 || code
== EQ_EXPR
|| code
== NE_EXPR
)
10196 && !VECTOR_TYPE_P (TREE_TYPE (arg0
))
10197 && ((truth_value_p (TREE_CODE (arg0
))
10198 && (truth_value_p (TREE_CODE (arg1
))
10199 || (TREE_CODE (arg1
) == BIT_AND_EXPR
10200 && integer_onep (TREE_OPERAND (arg1
, 1)))))
10201 || (truth_value_p (TREE_CODE (arg1
))
10202 && (truth_value_p (TREE_CODE (arg0
))
10203 || (TREE_CODE (arg0
) == BIT_AND_EXPR
10204 && integer_onep (TREE_OPERAND (arg0
, 1)))))))
10206 tem
= fold_build2_loc (loc
, code
== BIT_AND_EXPR
? TRUTH_AND_EXPR
10207 : code
== BIT_IOR_EXPR
? TRUTH_OR_EXPR
10210 fold_convert_loc (loc
, boolean_type_node
, arg0
),
10211 fold_convert_loc (loc
, boolean_type_node
, arg1
));
10213 if (code
== EQ_EXPR
)
10214 tem
= invert_truthvalue_loc (loc
, tem
);
10216 return fold_convert_loc (loc
, type
, tem
);
10219 if (TREE_CODE_CLASS (code
) == tcc_binary
10220 || TREE_CODE_CLASS (code
) == tcc_comparison
)
10222 if (TREE_CODE (arg0
) == COMPOUND_EXPR
)
10224 tem
= fold_build2_loc (loc
, code
, type
,
10225 fold_convert_loc (loc
, TREE_TYPE (op0
),
10226 TREE_OPERAND (arg0
, 1)), op1
);
10227 return build2_loc (loc
, COMPOUND_EXPR
, type
, TREE_OPERAND (arg0
, 0),
10230 if (TREE_CODE (arg1
) == COMPOUND_EXPR
)
10232 tem
= fold_build2_loc (loc
, code
, type
, op0
,
10233 fold_convert_loc (loc
, TREE_TYPE (op1
),
10234 TREE_OPERAND (arg1
, 1)));
10235 return build2_loc (loc
, COMPOUND_EXPR
, type
, TREE_OPERAND (arg1
, 0),
10239 if (TREE_CODE (arg0
) == COND_EXPR
10240 || TREE_CODE (arg0
) == VEC_COND_EXPR
10241 || COMPARISON_CLASS_P (arg0
))
10243 tem
= fold_binary_op_with_conditional_arg (loc
, code
, type
, op0
, op1
,
10245 /*cond_first_p=*/1);
10246 if (tem
!= NULL_TREE
)
10250 if (TREE_CODE (arg1
) == COND_EXPR
10251 || TREE_CODE (arg1
) == VEC_COND_EXPR
10252 || COMPARISON_CLASS_P (arg1
))
10254 tem
= fold_binary_op_with_conditional_arg (loc
, code
, type
, op0
, op1
,
10256 /*cond_first_p=*/0);
10257 if (tem
!= NULL_TREE
)
10265 /* MEM[&MEM[p, CST1], CST2] -> MEM[p, CST1 + CST2]. */
10266 if (TREE_CODE (arg0
) == ADDR_EXPR
10267 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == MEM_REF
)
10269 tree iref
= TREE_OPERAND (arg0
, 0);
10270 return fold_build2 (MEM_REF
, type
,
10271 TREE_OPERAND (iref
, 0),
10272 int_const_binop (PLUS_EXPR
, arg1
,
10273 TREE_OPERAND (iref
, 1)));
10276 /* MEM[&a.b, CST2] -> MEM[&a, offsetof (a, b) + CST2]. */
10277 if (TREE_CODE (arg0
) == ADDR_EXPR
10278 && handled_component_p (TREE_OPERAND (arg0
, 0)))
10281 poly_int64 coffset
;
10282 base
= get_addr_base_and_unit_offset (TREE_OPERAND (arg0
, 0),
10286 return fold_build2 (MEM_REF
, type
,
10287 build1 (ADDR_EXPR
, TREE_TYPE (arg0
), base
),
10288 int_const_binop (PLUS_EXPR
, arg1
,
10289 size_int (coffset
)));
10294 case POINTER_PLUS_EXPR
:
10295 /* INT +p INT -> (PTR)(INT + INT). Stripping types allows for this. */
10296 if (INTEGRAL_TYPE_P (TREE_TYPE (arg1
))
10297 && INTEGRAL_TYPE_P (TREE_TYPE (arg0
)))
10298 return fold_convert_loc (loc
, type
,
10299 fold_build2_loc (loc
, PLUS_EXPR
, sizetype
,
10300 fold_convert_loc (loc
, sizetype
,
10302 fold_convert_loc (loc
, sizetype
,
10308 if (INTEGRAL_TYPE_P (type
) || VECTOR_INTEGER_TYPE_P (type
))
10310 /* X + (X / CST) * -CST is X % CST. */
10311 if (TREE_CODE (arg1
) == MULT_EXPR
10312 && TREE_CODE (TREE_OPERAND (arg1
, 0)) == TRUNC_DIV_EXPR
10313 && operand_equal_p (arg0
,
10314 TREE_OPERAND (TREE_OPERAND (arg1
, 0), 0), 0))
10316 tree cst0
= TREE_OPERAND (TREE_OPERAND (arg1
, 0), 1);
10317 tree cst1
= TREE_OPERAND (arg1
, 1);
10318 tree sum
= fold_binary_loc (loc
, PLUS_EXPR
, TREE_TYPE (cst1
),
10320 if (sum
&& integer_zerop (sum
))
10321 return fold_convert_loc (loc
, type
,
10322 fold_build2_loc (loc
, TRUNC_MOD_EXPR
,
10323 TREE_TYPE (arg0
), arg0
,
10328 /* Handle (A1 * C1) + (A2 * C2) with A1, A2 or C1, C2 being the same or
10329 one. Make sure the type is not saturating and has the signedness of
10330 the stripped operands, as fold_plusminus_mult_expr will re-associate.
10331 ??? The latter condition should use TYPE_OVERFLOW_* flags instead. */
10332 if ((TREE_CODE (arg0
) == MULT_EXPR
10333 || TREE_CODE (arg1
) == MULT_EXPR
)
10334 && !TYPE_SATURATING (type
)
10335 && TYPE_UNSIGNED (type
) == TYPE_UNSIGNED (TREE_TYPE (arg0
))
10336 && TYPE_UNSIGNED (type
) == TYPE_UNSIGNED (TREE_TYPE (arg1
))
10337 && (!FLOAT_TYPE_P (type
) || flag_associative_math
))
10339 tree tem
= fold_plusminus_mult_expr (loc
, code
, type
, arg0
, arg1
);
10344 if (! FLOAT_TYPE_P (type
))
10346 /* Reassociate (plus (plus (mult) (foo)) (mult)) as
10347 (plus (plus (mult) (mult)) (foo)) so that we can
10348 take advantage of the factoring cases below. */
10349 if (ANY_INTEGRAL_TYPE_P (type
)
10350 && TYPE_OVERFLOW_WRAPS (type
)
10351 && (((TREE_CODE (arg0
) == PLUS_EXPR
10352 || TREE_CODE (arg0
) == MINUS_EXPR
)
10353 && TREE_CODE (arg1
) == MULT_EXPR
)
10354 || ((TREE_CODE (arg1
) == PLUS_EXPR
10355 || TREE_CODE (arg1
) == MINUS_EXPR
)
10356 && TREE_CODE (arg0
) == MULT_EXPR
)))
10358 tree parg0
, parg1
, parg
, marg
;
10359 enum tree_code pcode
;
10361 if (TREE_CODE (arg1
) == MULT_EXPR
)
10362 parg
= arg0
, marg
= arg1
;
10364 parg
= arg1
, marg
= arg0
;
10365 pcode
= TREE_CODE (parg
);
10366 parg0
= TREE_OPERAND (parg
, 0);
10367 parg1
= TREE_OPERAND (parg
, 1);
10368 STRIP_NOPS (parg0
);
10369 STRIP_NOPS (parg1
);
10371 if (TREE_CODE (parg0
) == MULT_EXPR
10372 && TREE_CODE (parg1
) != MULT_EXPR
)
10373 return fold_build2_loc (loc
, pcode
, type
,
10374 fold_build2_loc (loc
, PLUS_EXPR
, type
,
10375 fold_convert_loc (loc
, type
,
10377 fold_convert_loc (loc
, type
,
10379 fold_convert_loc (loc
, type
, parg1
));
10380 if (TREE_CODE (parg0
) != MULT_EXPR
10381 && TREE_CODE (parg1
) == MULT_EXPR
)
10383 fold_build2_loc (loc
, PLUS_EXPR
, type
,
10384 fold_convert_loc (loc
, type
, parg0
),
10385 fold_build2_loc (loc
, pcode
, type
,
10386 fold_convert_loc (loc
, type
, marg
),
10387 fold_convert_loc (loc
, type
,
10393 /* Fold __complex__ ( x, 0 ) + __complex__ ( 0, y )
10394 to __complex__ ( x, y ). This is not the same for SNaNs or
10395 if signed zeros are involved. */
10396 if (!HONOR_SNANS (element_mode (arg0
))
10397 && !HONOR_SIGNED_ZEROS (element_mode (arg0
))
10398 && COMPLEX_FLOAT_TYPE_P (TREE_TYPE (arg0
)))
10400 tree rtype
= TREE_TYPE (TREE_TYPE (arg0
));
10401 tree arg0r
= fold_unary_loc (loc
, REALPART_EXPR
, rtype
, arg0
);
10402 tree arg0i
= fold_unary_loc (loc
, IMAGPART_EXPR
, rtype
, arg0
);
10403 bool arg0rz
= false, arg0iz
= false;
10404 if ((arg0r
&& (arg0rz
= real_zerop (arg0r
)))
10405 || (arg0i
&& (arg0iz
= real_zerop (arg0i
))))
10407 tree arg1r
= fold_unary_loc (loc
, REALPART_EXPR
, rtype
, arg1
);
10408 tree arg1i
= fold_unary_loc (loc
, IMAGPART_EXPR
, rtype
, arg1
);
10409 if (arg0rz
&& arg1i
&& real_zerop (arg1i
))
10411 tree rp
= arg1r
? arg1r
10412 : build1 (REALPART_EXPR
, rtype
, arg1
);
10413 tree ip
= arg0i
? arg0i
10414 : build1 (IMAGPART_EXPR
, rtype
, arg0
);
10415 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
, rp
, ip
);
10417 else if (arg0iz
&& arg1r
&& real_zerop (arg1r
))
10419 tree rp
= arg0r
? arg0r
10420 : build1 (REALPART_EXPR
, rtype
, arg0
);
10421 tree ip
= arg1i
? arg1i
10422 : build1 (IMAGPART_EXPR
, rtype
, arg1
);
10423 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
, rp
, ip
);
10428 /* Convert a + (b*c + d*e) into (a + b*c) + d*e.
10429 We associate floats only if the user has specified
10430 -fassociative-math. */
10431 if (flag_associative_math
10432 && TREE_CODE (arg1
) == PLUS_EXPR
10433 && TREE_CODE (arg0
) != MULT_EXPR
)
10435 tree tree10
= TREE_OPERAND (arg1
, 0);
10436 tree tree11
= TREE_OPERAND (arg1
, 1);
10437 if (TREE_CODE (tree11
) == MULT_EXPR
10438 && TREE_CODE (tree10
) == MULT_EXPR
)
10441 tree0
= fold_build2_loc (loc
, PLUS_EXPR
, type
, arg0
, tree10
);
10442 return fold_build2_loc (loc
, PLUS_EXPR
, type
, tree0
, tree11
);
10445 /* Convert (b*c + d*e) + a into b*c + (d*e +a).
10446 We associate floats only if the user has specified
10447 -fassociative-math. */
10448 if (flag_associative_math
10449 && TREE_CODE (arg0
) == PLUS_EXPR
10450 && TREE_CODE (arg1
) != MULT_EXPR
)
10452 tree tree00
= TREE_OPERAND (arg0
, 0);
10453 tree tree01
= TREE_OPERAND (arg0
, 1);
10454 if (TREE_CODE (tree01
) == MULT_EXPR
10455 && TREE_CODE (tree00
) == MULT_EXPR
)
10458 tree0
= fold_build2_loc (loc
, PLUS_EXPR
, type
, tree01
, arg1
);
10459 return fold_build2_loc (loc
, PLUS_EXPR
, type
, tree00
, tree0
);
10465 /* (A << C1) + (A >> C2) if A is unsigned and C1+C2 is the size of A
10466 is a rotate of A by C1 bits. */
10467 /* (A << B) + (A >> (Z - B)) if A is unsigned and Z is the size of A
10468 is a rotate of A by B bits.
10469 Similarly for (A << B) | (A >> (-B & C3)) where C3 is Z-1,
10470 though in this case CODE must be | and not + or ^, otherwise
10471 it doesn't return A when B is 0. */
10473 enum tree_code code0
, code1
;
10475 code0
= TREE_CODE (arg0
);
10476 code1
= TREE_CODE (arg1
);
10477 if (((code0
== RSHIFT_EXPR
&& code1
== LSHIFT_EXPR
)
10478 || (code1
== RSHIFT_EXPR
&& code0
== LSHIFT_EXPR
))
10479 && operand_equal_p (TREE_OPERAND (arg0
, 0),
10480 TREE_OPERAND (arg1
, 0), 0)
10481 && (rtype
= TREE_TYPE (TREE_OPERAND (arg0
, 0)),
10482 TYPE_UNSIGNED (rtype
))
10483 /* Only create rotates in complete modes. Other cases are not
10484 expanded properly. */
10485 && (element_precision (rtype
)
10486 == GET_MODE_UNIT_PRECISION (TYPE_MODE (rtype
))))
10488 tree tree01
, tree11
;
10489 tree orig_tree01
, orig_tree11
;
10490 enum tree_code code01
, code11
;
10492 tree01
= orig_tree01
= TREE_OPERAND (arg0
, 1);
10493 tree11
= orig_tree11
= TREE_OPERAND (arg1
, 1);
10494 STRIP_NOPS (tree01
);
10495 STRIP_NOPS (tree11
);
10496 code01
= TREE_CODE (tree01
);
10497 code11
= TREE_CODE (tree11
);
10498 if (code11
!= MINUS_EXPR
10499 && (code01
== MINUS_EXPR
|| code01
== BIT_AND_EXPR
))
10501 std::swap (code0
, code1
);
10502 std::swap (code01
, code11
);
10503 std::swap (tree01
, tree11
);
10504 std::swap (orig_tree01
, orig_tree11
);
10506 if (code01
== INTEGER_CST
10507 && code11
== INTEGER_CST
10508 && (wi::to_widest (tree01
) + wi::to_widest (tree11
)
10509 == element_precision (rtype
)))
10511 tem
= build2_loc (loc
, LROTATE_EXPR
,
10512 rtype
, TREE_OPERAND (arg0
, 0),
10513 code0
== LSHIFT_EXPR
10514 ? orig_tree01
: orig_tree11
);
10515 return fold_convert_loc (loc
, type
, tem
);
10517 else if (code11
== MINUS_EXPR
)
10519 tree tree110
, tree111
;
10520 tree110
= TREE_OPERAND (tree11
, 0);
10521 tree111
= TREE_OPERAND (tree11
, 1);
10522 STRIP_NOPS (tree110
);
10523 STRIP_NOPS (tree111
);
10524 if (TREE_CODE (tree110
) == INTEGER_CST
10525 && compare_tree_int (tree110
,
10526 element_precision (rtype
)) == 0
10527 && operand_equal_p (tree01
, tree111
, 0))
10529 tem
= build2_loc (loc
, (code0
== LSHIFT_EXPR
10530 ? LROTATE_EXPR
: RROTATE_EXPR
),
10531 rtype
, TREE_OPERAND (arg0
, 0),
10533 return fold_convert_loc (loc
, type
, tem
);
10536 else if (code
== BIT_IOR_EXPR
10537 && code11
== BIT_AND_EXPR
10538 && pow2p_hwi (element_precision (rtype
)))
10540 tree tree110
, tree111
;
10541 tree110
= TREE_OPERAND (tree11
, 0);
10542 tree111
= TREE_OPERAND (tree11
, 1);
10543 STRIP_NOPS (tree110
);
10544 STRIP_NOPS (tree111
);
10545 if (TREE_CODE (tree110
) == NEGATE_EXPR
10546 && TREE_CODE (tree111
) == INTEGER_CST
10547 && compare_tree_int (tree111
,
10548 element_precision (rtype
) - 1) == 0
10549 && operand_equal_p (tree01
, TREE_OPERAND (tree110
, 0), 0))
10551 tem
= build2_loc (loc
, (code0
== LSHIFT_EXPR
10552 ? LROTATE_EXPR
: RROTATE_EXPR
),
10553 rtype
, TREE_OPERAND (arg0
, 0),
10555 return fold_convert_loc (loc
, type
, tem
);
10562 /* In most languages, can't associate operations on floats through
10563 parentheses. Rather than remember where the parentheses were, we
10564 don't associate floats at all, unless the user has specified
10565 -fassociative-math.
10566 And, we need to make sure type is not saturating. */
10568 if ((! FLOAT_TYPE_P (type
) || flag_associative_math
)
10569 && !TYPE_SATURATING (type
))
10571 tree var0
, minus_var0
, con0
, minus_con0
, lit0
, minus_lit0
;
10572 tree var1
, minus_var1
, con1
, minus_con1
, lit1
, minus_lit1
;
10576 /* Split both trees into variables, constants, and literals. Then
10577 associate each group together, the constants with literals,
10578 then the result with variables. This increases the chances of
10579 literals being recombined later and of generating relocatable
10580 expressions for the sum of a constant and literal. */
10581 var0
= split_tree (arg0
, type
, code
,
10582 &minus_var0
, &con0
, &minus_con0
,
10583 &lit0
, &minus_lit0
, 0);
10584 var1
= split_tree (arg1
, type
, code
,
10585 &minus_var1
, &con1
, &minus_con1
,
10586 &lit1
, &minus_lit1
, code
== MINUS_EXPR
);
10588 /* Recombine MINUS_EXPR operands by using PLUS_EXPR. */
10589 if (code
== MINUS_EXPR
)
10592 /* With undefined overflow prefer doing association in a type
10593 which wraps on overflow, if that is one of the operand types. */
10594 if ((POINTER_TYPE_P (type
) || INTEGRAL_TYPE_P (type
))
10595 && !TYPE_OVERFLOW_WRAPS (type
))
10597 if (INTEGRAL_TYPE_P (TREE_TYPE (arg0
))
10598 && TYPE_OVERFLOW_WRAPS (TREE_TYPE (arg0
)))
10599 atype
= TREE_TYPE (arg0
);
10600 else if (INTEGRAL_TYPE_P (TREE_TYPE (arg1
))
10601 && TYPE_OVERFLOW_WRAPS (TREE_TYPE (arg1
)))
10602 atype
= TREE_TYPE (arg1
);
10603 gcc_assert (TYPE_PRECISION (atype
) == TYPE_PRECISION (type
));
10606 /* With undefined overflow we can only associate constants with one
10607 variable, and constants whose association doesn't overflow. */
10608 if ((POINTER_TYPE_P (atype
) || INTEGRAL_TYPE_P (atype
))
10609 && !TYPE_OVERFLOW_WRAPS (atype
))
10611 if ((var0
&& var1
) || (minus_var0
&& minus_var1
))
10613 /* ??? If split_tree would handle NEGATE_EXPR we could
10614 simply reject these cases and the allowed cases would
10615 be the var0/minus_var1 ones. */
10616 tree tmp0
= var0
? var0
: minus_var0
;
10617 tree tmp1
= var1
? var1
: minus_var1
;
10618 bool one_neg
= false;
10620 if (TREE_CODE (tmp0
) == NEGATE_EXPR
)
10622 tmp0
= TREE_OPERAND (tmp0
, 0);
10623 one_neg
= !one_neg
;
10625 if (CONVERT_EXPR_P (tmp0
)
10626 && INTEGRAL_TYPE_P (TREE_TYPE (TREE_OPERAND (tmp0
, 0)))
10627 && (TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (tmp0
, 0)))
10628 <= TYPE_PRECISION (atype
)))
10629 tmp0
= TREE_OPERAND (tmp0
, 0);
10630 if (TREE_CODE (tmp1
) == NEGATE_EXPR
)
10632 tmp1
= TREE_OPERAND (tmp1
, 0);
10633 one_neg
= !one_neg
;
10635 if (CONVERT_EXPR_P (tmp1
)
10636 && INTEGRAL_TYPE_P (TREE_TYPE (TREE_OPERAND (tmp1
, 0)))
10637 && (TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (tmp1
, 0)))
10638 <= TYPE_PRECISION (atype
)))
10639 tmp1
= TREE_OPERAND (tmp1
, 0);
10640 /* The only case we can still associate with two variables
10641 is if they cancel out. */
10643 || !operand_equal_p (tmp0
, tmp1
, 0))
10646 else if ((var0
&& minus_var1
10647 && ! operand_equal_p (var0
, minus_var1
, 0))
10648 || (minus_var0
&& var1
10649 && ! operand_equal_p (minus_var0
, var1
, 0)))
10653 /* Only do something if we found more than two objects. Otherwise,
10654 nothing has changed and we risk infinite recursion. */
10656 && ((var0
!= 0) + (var1
!= 0)
10657 + (minus_var0
!= 0) + (minus_var1
!= 0)
10658 + (con0
!= 0) + (con1
!= 0)
10659 + (minus_con0
!= 0) + (minus_con1
!= 0)
10660 + (lit0
!= 0) + (lit1
!= 0)
10661 + (minus_lit0
!= 0) + (minus_lit1
!= 0)) > 2)
10663 var0
= associate_trees (loc
, var0
, var1
, code
, atype
);
10664 minus_var0
= associate_trees (loc
, minus_var0
, minus_var1
,
10666 con0
= associate_trees (loc
, con0
, con1
, code
, atype
);
10667 minus_con0
= associate_trees (loc
, minus_con0
, minus_con1
,
10669 lit0
= associate_trees (loc
, lit0
, lit1
, code
, atype
);
10670 minus_lit0
= associate_trees (loc
, minus_lit0
, minus_lit1
,
10673 if (minus_var0
&& var0
)
10675 var0
= associate_trees (loc
, var0
, minus_var0
,
10676 MINUS_EXPR
, atype
);
10679 if (minus_con0
&& con0
)
10681 con0
= associate_trees (loc
, con0
, minus_con0
,
10682 MINUS_EXPR
, atype
);
10686 /* Preserve the MINUS_EXPR if the negative part of the literal is
10687 greater than the positive part. Otherwise, the multiplicative
10688 folding code (i.e extract_muldiv) may be fooled in case
10689 unsigned constants are subtracted, like in the following
10690 example: ((X*2 + 4) - 8U)/2. */
10691 if (minus_lit0
&& lit0
)
10693 if (TREE_CODE (lit0
) == INTEGER_CST
10694 && TREE_CODE (minus_lit0
) == INTEGER_CST
10695 && tree_int_cst_lt (lit0
, minus_lit0
)
10696 /* But avoid ending up with only negated parts. */
10699 minus_lit0
= associate_trees (loc
, minus_lit0
, lit0
,
10700 MINUS_EXPR
, atype
);
10705 lit0
= associate_trees (loc
, lit0
, minus_lit0
,
10706 MINUS_EXPR
, atype
);
10711 /* Don't introduce overflows through reassociation. */
10712 if ((lit0
&& TREE_OVERFLOW_P (lit0
))
10713 || (minus_lit0
&& TREE_OVERFLOW_P (minus_lit0
)))
10716 /* Eliminate lit0 and minus_lit0 to con0 and minus_con0. */
10717 con0
= associate_trees (loc
, con0
, lit0
, code
, atype
);
10719 minus_con0
= associate_trees (loc
, minus_con0
, minus_lit0
,
10723 /* Eliminate minus_con0. */
10727 con0
= associate_trees (loc
, con0
, minus_con0
,
10728 MINUS_EXPR
, atype
);
10730 var0
= associate_trees (loc
, var0
, minus_con0
,
10731 MINUS_EXPR
, atype
);
10733 gcc_unreachable ();
10737 /* Eliminate minus_var0. */
10741 con0
= associate_trees (loc
, con0
, minus_var0
,
10742 MINUS_EXPR
, atype
);
10744 gcc_unreachable ();
10749 fold_convert_loc (loc
, type
, associate_trees (loc
, var0
, con0
,
10756 case POINTER_DIFF_EXPR
:
10758 /* Fold &a[i] - &a[j] to i-j. */
10759 if (TREE_CODE (arg0
) == ADDR_EXPR
10760 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == ARRAY_REF
10761 && TREE_CODE (arg1
) == ADDR_EXPR
10762 && TREE_CODE (TREE_OPERAND (arg1
, 0)) == ARRAY_REF
)
10764 tree tem
= fold_addr_of_array_ref_difference (loc
, type
,
10765 TREE_OPERAND (arg0
, 0),
10766 TREE_OPERAND (arg1
, 0),
10768 == POINTER_DIFF_EXPR
);
10773 /* Further transformations are not for pointers. */
10774 if (code
== POINTER_DIFF_EXPR
)
10777 /* (-A) - B -> (-B) - A where B is easily negated and we can swap. */
10778 if (TREE_CODE (arg0
) == NEGATE_EXPR
10779 && negate_expr_p (op1
)
10780 /* If arg0 is e.g. unsigned int and type is int, then this could
10781 introduce UB, because if A is INT_MIN at runtime, the original
10782 expression can be well defined while the latter is not.
10784 && !(ANY_INTEGRAL_TYPE_P (type
)
10785 && TYPE_OVERFLOW_UNDEFINED (type
)
10786 && ANY_INTEGRAL_TYPE_P (TREE_TYPE (arg0
))
10787 && !TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (arg0
))))
10788 return fold_build2_loc (loc
, MINUS_EXPR
, type
, negate_expr (op1
),
10789 fold_convert_loc (loc
, type
,
10790 TREE_OPERAND (arg0
, 0)));
10792 /* Fold __complex__ ( x, 0 ) - __complex__ ( 0, y ) to
10793 __complex__ ( x, -y ). This is not the same for SNaNs or if
10794 signed zeros are involved. */
10795 if (!HONOR_SNANS (element_mode (arg0
))
10796 && !HONOR_SIGNED_ZEROS (element_mode (arg0
))
10797 && COMPLEX_FLOAT_TYPE_P (TREE_TYPE (arg0
)))
10799 tree rtype
= TREE_TYPE (TREE_TYPE (arg0
));
10800 tree arg0r
= fold_unary_loc (loc
, REALPART_EXPR
, rtype
, arg0
);
10801 tree arg0i
= fold_unary_loc (loc
, IMAGPART_EXPR
, rtype
, arg0
);
10802 bool arg0rz
= false, arg0iz
= false;
10803 if ((arg0r
&& (arg0rz
= real_zerop (arg0r
)))
10804 || (arg0i
&& (arg0iz
= real_zerop (arg0i
))))
10806 tree arg1r
= fold_unary_loc (loc
, REALPART_EXPR
, rtype
, arg1
);
10807 tree arg1i
= fold_unary_loc (loc
, IMAGPART_EXPR
, rtype
, arg1
);
10808 if (arg0rz
&& arg1i
&& real_zerop (arg1i
))
10810 tree rp
= fold_build1_loc (loc
, NEGATE_EXPR
, rtype
,
10812 : build1 (REALPART_EXPR
, rtype
, arg1
));
10813 tree ip
= arg0i
? arg0i
10814 : build1 (IMAGPART_EXPR
, rtype
, arg0
);
10815 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
, rp
, ip
);
10817 else if (arg0iz
&& arg1r
&& real_zerop (arg1r
))
10819 tree rp
= arg0r
? arg0r
10820 : build1 (REALPART_EXPR
, rtype
, arg0
);
10821 tree ip
= fold_build1_loc (loc
, NEGATE_EXPR
, rtype
,
10823 : build1 (IMAGPART_EXPR
, rtype
, arg1
));
10824 return fold_build2_loc (loc
, COMPLEX_EXPR
, type
, rp
, ip
);
10829 /* A - B -> A + (-B) if B is easily negatable. */
10830 if (negate_expr_p (op1
)
10831 && ! TYPE_OVERFLOW_SANITIZED (type
)
10832 && ((FLOAT_TYPE_P (type
)
10833 /* Avoid this transformation if B is a positive REAL_CST. */
10834 && (TREE_CODE (op1
) != REAL_CST
10835 || REAL_VALUE_NEGATIVE (TREE_REAL_CST (op1
))))
10836 || INTEGRAL_TYPE_P (type
)))
10837 return fold_build2_loc (loc
, PLUS_EXPR
, type
,
10838 fold_convert_loc (loc
, type
, arg0
),
10839 negate_expr (op1
));
10841 /* Handle (A1 * C1) - (A2 * C2) with A1, A2 or C1, C2 being the same or
10842 one. Make sure the type is not saturating and has the signedness of
10843 the stripped operands, as fold_plusminus_mult_expr will re-associate.
10844 ??? The latter condition should use TYPE_OVERFLOW_* flags instead. */
10845 if ((TREE_CODE (arg0
) == MULT_EXPR
10846 || TREE_CODE (arg1
) == MULT_EXPR
)
10847 && !TYPE_SATURATING (type
)
10848 && TYPE_UNSIGNED (type
) == TYPE_UNSIGNED (TREE_TYPE (arg0
))
10849 && TYPE_UNSIGNED (type
) == TYPE_UNSIGNED (TREE_TYPE (arg1
))
10850 && (!FLOAT_TYPE_P (type
) || flag_associative_math
))
10852 tree tem
= fold_plusminus_mult_expr (loc
, code
, type
, arg0
, arg1
);
10860 if (! FLOAT_TYPE_P (type
))
10862 /* Transform x * -C into -x * C if x is easily negatable. */
10863 if (TREE_CODE (op1
) == INTEGER_CST
10864 && tree_int_cst_sgn (op1
) == -1
10865 && negate_expr_p (op0
)
10866 && negate_expr_p (op1
)
10867 && (tem
= negate_expr (op1
)) != op1
10868 && ! TREE_OVERFLOW (tem
))
10869 return fold_build2_loc (loc
, MULT_EXPR
, type
,
10870 fold_convert_loc (loc
, type
,
10871 negate_expr (op0
)), tem
);
10873 strict_overflow_p
= false;
10874 if (TREE_CODE (arg1
) == INTEGER_CST
10875 && (tem
= extract_muldiv (op0
, arg1
, code
, NULL_TREE
,
10876 &strict_overflow_p
)) != 0)
10878 if (strict_overflow_p
)
10879 fold_overflow_warning (("assuming signed overflow does not "
10880 "occur when simplifying "
10882 WARN_STRICT_OVERFLOW_MISC
);
10883 return fold_convert_loc (loc
, type
, tem
);
10886 /* Optimize z * conj(z) for integer complex numbers. */
10887 if (TREE_CODE (arg0
) == CONJ_EXPR
10888 && operand_equal_p (TREE_OPERAND (arg0
, 0), arg1
, 0))
10889 return fold_mult_zconjz (loc
, type
, arg1
);
10890 if (TREE_CODE (arg1
) == CONJ_EXPR
10891 && operand_equal_p (arg0
, TREE_OPERAND (arg1
, 0), 0))
10892 return fold_mult_zconjz (loc
, type
, arg0
);
10896 /* Fold z * +-I to __complex__ (-+__imag z, +-__real z).
10897 This is not the same for NaNs or if signed zeros are
10899 if (!HONOR_NANS (arg0
)
10900 && !HONOR_SIGNED_ZEROS (element_mode (arg0
))
10901 && COMPLEX_FLOAT_TYPE_P (TREE_TYPE (arg0
))
10902 && TREE_CODE (arg1
) == COMPLEX_CST
10903 && real_zerop (TREE_REALPART (arg1
)))
10905 tree rtype
= TREE_TYPE (TREE_TYPE (arg0
));
10906 if (real_onep (TREE_IMAGPART (arg1
)))
10908 fold_build2_loc (loc
, COMPLEX_EXPR
, type
,
10909 negate_expr (fold_build1_loc (loc
, IMAGPART_EXPR
,
10911 fold_build1_loc (loc
, REALPART_EXPR
, rtype
, arg0
));
10912 else if (real_minus_onep (TREE_IMAGPART (arg1
)))
10914 fold_build2_loc (loc
, COMPLEX_EXPR
, type
,
10915 fold_build1_loc (loc
, IMAGPART_EXPR
, rtype
, arg0
),
10916 negate_expr (fold_build1_loc (loc
, REALPART_EXPR
,
10920 /* Optimize z * conj(z) for floating point complex numbers.
10921 Guarded by flag_unsafe_math_optimizations as non-finite
10922 imaginary components don't produce scalar results. */
10923 if (flag_unsafe_math_optimizations
10924 && TREE_CODE (arg0
) == CONJ_EXPR
10925 && operand_equal_p (TREE_OPERAND (arg0
, 0), arg1
, 0))
10926 return fold_mult_zconjz (loc
, type
, arg1
);
10927 if (flag_unsafe_math_optimizations
10928 && TREE_CODE (arg1
) == CONJ_EXPR
10929 && operand_equal_p (arg0
, TREE_OPERAND (arg1
, 0), 0))
10930 return fold_mult_zconjz (loc
, type
, arg0
);
10935 /* Canonicalize (X & C1) | C2. */
10936 if (TREE_CODE (arg0
) == BIT_AND_EXPR
10937 && TREE_CODE (arg1
) == INTEGER_CST
10938 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
)
10940 int width
= TYPE_PRECISION (type
), w
;
10941 wide_int c1
= wi::to_wide (TREE_OPERAND (arg0
, 1));
10942 wide_int c2
= wi::to_wide (arg1
);
10944 /* If (C1&C2) == C1, then (X&C1)|C2 becomes (X,C2). */
10945 if ((c1
& c2
) == c1
)
10946 return omit_one_operand_loc (loc
, type
, arg1
,
10947 TREE_OPERAND (arg0
, 0));
10949 wide_int msk
= wi::mask (width
, false,
10950 TYPE_PRECISION (TREE_TYPE (arg1
)));
10952 /* If (C1|C2) == ~0 then (X&C1)|C2 becomes X|C2. */
10953 if (wi::bit_and_not (msk
, c1
| c2
) == 0)
10955 tem
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 0));
10956 return fold_build2_loc (loc
, BIT_IOR_EXPR
, type
, tem
, arg1
);
10959 /* Minimize the number of bits set in C1, i.e. C1 := C1 & ~C2,
10960 unless (C1 & ~C2) | (C2 & C3) for some C3 is a mask of some
10961 mode which allows further optimizations. */
10964 wide_int c3
= wi::bit_and_not (c1
, c2
);
10965 for (w
= BITS_PER_UNIT
; w
<= width
; w
<<= 1)
10967 wide_int mask
= wi::mask (w
, false,
10968 TYPE_PRECISION (type
));
10969 if (((c1
| c2
) & mask
) == mask
10970 && wi::bit_and_not (c1
, mask
) == 0)
10979 tem
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 0));
10980 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, type
, tem
,
10981 wide_int_to_tree (type
, c3
));
10982 return fold_build2_loc (loc
, BIT_IOR_EXPR
, type
, tem
, arg1
);
10986 /* See if this can be simplified into a rotate first. If that
10987 is unsuccessful continue in the association code. */
10991 /* Fold (X & 1) ^ 1 as (X & 1) == 0. */
10992 if (TREE_CODE (arg0
) == BIT_AND_EXPR
10993 && INTEGRAL_TYPE_P (type
)
10994 && integer_onep (TREE_OPERAND (arg0
, 1))
10995 && integer_onep (arg1
))
10996 return fold_build2_loc (loc
, EQ_EXPR
, type
, arg0
,
10997 build_zero_cst (TREE_TYPE (arg0
)));
10999 /* See if this can be simplified into a rotate first. If that
11000 is unsuccessful continue in the association code. */
11004 /* Fold (X ^ 1) & 1 as (X & 1) == 0. */
11005 if (TREE_CODE (arg0
) == BIT_XOR_EXPR
11006 && INTEGRAL_TYPE_P (type
)
11007 && integer_onep (TREE_OPERAND (arg0
, 1))
11008 && integer_onep (arg1
))
11011 tem
= TREE_OPERAND (arg0
, 0);
11012 tem2
= fold_convert_loc (loc
, TREE_TYPE (tem
), arg1
);
11013 tem2
= fold_build2_loc (loc
, BIT_AND_EXPR
, TREE_TYPE (tem
),
11015 return fold_build2_loc (loc
, EQ_EXPR
, type
, tem2
,
11016 build_zero_cst (TREE_TYPE (tem
)));
11018 /* Fold ~X & 1 as (X & 1) == 0. */
11019 if (TREE_CODE (arg0
) == BIT_NOT_EXPR
11020 && INTEGRAL_TYPE_P (type
)
11021 && integer_onep (arg1
))
11024 tem
= TREE_OPERAND (arg0
, 0);
11025 tem2
= fold_convert_loc (loc
, TREE_TYPE (tem
), arg1
);
11026 tem2
= fold_build2_loc (loc
, BIT_AND_EXPR
, TREE_TYPE (tem
),
11028 return fold_build2_loc (loc
, EQ_EXPR
, type
, tem2
,
11029 build_zero_cst (TREE_TYPE (tem
)));
11031 /* Fold !X & 1 as X == 0. */
11032 if (TREE_CODE (arg0
) == TRUTH_NOT_EXPR
11033 && integer_onep (arg1
))
11035 tem
= TREE_OPERAND (arg0
, 0);
11036 return fold_build2_loc (loc
, EQ_EXPR
, type
, tem
,
11037 build_zero_cst (TREE_TYPE (tem
)));
11040 /* Fold (X * Y) & -(1 << CST) to X * Y if Y is a constant
11041 multiple of 1 << CST. */
11042 if (TREE_CODE (arg1
) == INTEGER_CST
)
11044 wi::tree_to_wide_ref cst1
= wi::to_wide (arg1
);
11045 wide_int ncst1
= -cst1
;
11046 if ((cst1
& ncst1
) == ncst1
11047 && multiple_of_p (type
, arg0
,
11048 wide_int_to_tree (TREE_TYPE (arg1
), ncst1
)))
11049 return fold_convert_loc (loc
, type
, arg0
);
11052 /* Fold (X * CST1) & CST2 to zero if we can, or drop known zero
11054 if (TREE_CODE (arg1
) == INTEGER_CST
11055 && TREE_CODE (arg0
) == MULT_EXPR
11056 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
)
11058 wi::tree_to_wide_ref warg1
= wi::to_wide (arg1
);
11060 = mask_with_tz (type
, warg1
, wi::to_wide (TREE_OPERAND (arg0
, 1)));
11063 return omit_two_operands_loc (loc
, type
, build_zero_cst (type
),
11065 else if (masked
!= warg1
)
11067 /* Avoid the transform if arg1 is a mask of some
11068 mode which allows further optimizations. */
11069 int pop
= wi::popcount (warg1
);
11070 if (!(pop
>= BITS_PER_UNIT
11072 && wi::mask (pop
, false, warg1
.get_precision ()) == warg1
))
11073 return fold_build2_loc (loc
, code
, type
, op0
,
11074 wide_int_to_tree (type
, masked
));
11078 /* Simplify ((int)c & 0377) into (int)c, if c is unsigned char. */
11079 if (TREE_CODE (arg1
) == INTEGER_CST
&& TREE_CODE (arg0
) == NOP_EXPR
11080 && TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (arg0
, 0))))
11082 prec
= element_precision (TREE_TYPE (TREE_OPERAND (arg0
, 0)));
11084 wide_int mask
= wide_int::from (wi::to_wide (arg1
), prec
, UNSIGNED
);
11087 fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 0));
11093 /* Don't touch a floating-point divide by zero unless the mode
11094 of the constant can represent infinity. */
11095 if (TREE_CODE (arg1
) == REAL_CST
11096 && !MODE_HAS_INFINITIES (TYPE_MODE (TREE_TYPE (arg1
)))
11097 && real_zerop (arg1
))
11100 /* (-A) / (-B) -> A / B */
11101 if (TREE_CODE (arg0
) == NEGATE_EXPR
&& negate_expr_p (arg1
))
11102 return fold_build2_loc (loc
, RDIV_EXPR
, type
,
11103 TREE_OPERAND (arg0
, 0),
11104 negate_expr (arg1
));
11105 if (TREE_CODE (arg1
) == NEGATE_EXPR
&& negate_expr_p (arg0
))
11106 return fold_build2_loc (loc
, RDIV_EXPR
, type
,
11107 negate_expr (arg0
),
11108 TREE_OPERAND (arg1
, 0));
11111 case TRUNC_DIV_EXPR
:
11114 case FLOOR_DIV_EXPR
:
11115 /* Simplify A / (B << N) where A and B are positive and B is
11116 a power of 2, to A >> (N + log2(B)). */
11117 strict_overflow_p
= false;
11118 if (TREE_CODE (arg1
) == LSHIFT_EXPR
11119 && (TYPE_UNSIGNED (type
)
11120 || tree_expr_nonnegative_warnv_p (op0
, &strict_overflow_p
)))
11122 tree sval
= TREE_OPERAND (arg1
, 0);
11123 if (integer_pow2p (sval
) && tree_int_cst_sgn (sval
) > 0)
11125 tree sh_cnt
= TREE_OPERAND (arg1
, 1);
11126 tree pow2
= build_int_cst (TREE_TYPE (sh_cnt
),
11127 wi::exact_log2 (wi::to_wide (sval
)));
11129 if (strict_overflow_p
)
11130 fold_overflow_warning (("assuming signed overflow does not "
11131 "occur when simplifying A / (B << N)"),
11132 WARN_STRICT_OVERFLOW_MISC
);
11134 sh_cnt
= fold_build2_loc (loc
, PLUS_EXPR
, TREE_TYPE (sh_cnt
),
11136 return fold_build2_loc (loc
, RSHIFT_EXPR
, type
,
11137 fold_convert_loc (loc
, type
, arg0
), sh_cnt
);
11143 case ROUND_DIV_EXPR
:
11144 case CEIL_DIV_EXPR
:
11145 case EXACT_DIV_EXPR
:
11146 if (integer_zerop (arg1
))
11149 /* Convert -A / -B to A / B when the type is signed and overflow is
11151 if ((!ANY_INTEGRAL_TYPE_P (type
) || TYPE_OVERFLOW_UNDEFINED (type
))
11152 && TREE_CODE (op0
) == NEGATE_EXPR
11153 && negate_expr_p (op1
))
11155 if (ANY_INTEGRAL_TYPE_P (type
))
11156 fold_overflow_warning (("assuming signed overflow does not occur "
11157 "when distributing negation across "
11159 WARN_STRICT_OVERFLOW_MISC
);
11160 return fold_build2_loc (loc
, code
, type
,
11161 fold_convert_loc (loc
, type
,
11162 TREE_OPERAND (arg0
, 0)),
11163 negate_expr (op1
));
11165 if ((!ANY_INTEGRAL_TYPE_P (type
) || TYPE_OVERFLOW_UNDEFINED (type
))
11166 && TREE_CODE (arg1
) == NEGATE_EXPR
11167 && negate_expr_p (op0
))
11169 if (ANY_INTEGRAL_TYPE_P (type
))
11170 fold_overflow_warning (("assuming signed overflow does not occur "
11171 "when distributing negation across "
11173 WARN_STRICT_OVERFLOW_MISC
);
11174 return fold_build2_loc (loc
, code
, type
,
11176 fold_convert_loc (loc
, type
,
11177 TREE_OPERAND (arg1
, 0)));
11180 /* If arg0 is a multiple of arg1, then rewrite to the fastest div
11181 operation, EXACT_DIV_EXPR.
11183 Note that only CEIL_DIV_EXPR and FLOOR_DIV_EXPR are rewritten now.
11184 At one time others generated faster code, it's not clear if they do
11185 after the last round to changes to the DIV code in expmed.c. */
11186 if ((code
== CEIL_DIV_EXPR
|| code
== FLOOR_DIV_EXPR
)
11187 && multiple_of_p (type
, arg0
, arg1
))
11188 return fold_build2_loc (loc
, EXACT_DIV_EXPR
, type
,
11189 fold_convert (type
, arg0
),
11190 fold_convert (type
, arg1
));
11192 strict_overflow_p
= false;
11193 if (TREE_CODE (arg1
) == INTEGER_CST
11194 && (tem
= extract_muldiv (op0
, arg1
, code
, NULL_TREE
,
11195 &strict_overflow_p
)) != 0)
11197 if (strict_overflow_p
)
11198 fold_overflow_warning (("assuming signed overflow does not occur "
11199 "when simplifying division"),
11200 WARN_STRICT_OVERFLOW_MISC
);
11201 return fold_convert_loc (loc
, type
, tem
);
11206 case CEIL_MOD_EXPR
:
11207 case FLOOR_MOD_EXPR
:
11208 case ROUND_MOD_EXPR
:
11209 case TRUNC_MOD_EXPR
:
11210 strict_overflow_p
= false;
11211 if (TREE_CODE (arg1
) == INTEGER_CST
11212 && (tem
= extract_muldiv (op0
, arg1
, code
, NULL_TREE
,
11213 &strict_overflow_p
)) != 0)
11215 if (strict_overflow_p
)
11216 fold_overflow_warning (("assuming signed overflow does not occur "
11217 "when simplifying modulus"),
11218 WARN_STRICT_OVERFLOW_MISC
);
11219 return fold_convert_loc (loc
, type
, tem
);
11228 /* Since negative shift count is not well-defined,
11229 don't try to compute it in the compiler. */
11230 if (TREE_CODE (arg1
) == INTEGER_CST
&& tree_int_cst_sgn (arg1
) < 0)
11233 prec
= element_precision (type
);
11235 /* If we have a rotate of a bit operation with the rotate count and
11236 the second operand of the bit operation both constant,
11237 permute the two operations. */
11238 if (code
== RROTATE_EXPR
&& TREE_CODE (arg1
) == INTEGER_CST
11239 && (TREE_CODE (arg0
) == BIT_AND_EXPR
11240 || TREE_CODE (arg0
) == BIT_IOR_EXPR
11241 || TREE_CODE (arg0
) == BIT_XOR_EXPR
)
11242 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
)
11244 tree arg00
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 0));
11245 tree arg01
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 1));
11246 return fold_build2_loc (loc
, TREE_CODE (arg0
), type
,
11247 fold_build2_loc (loc
, code
, type
,
11249 fold_build2_loc (loc
, code
, type
,
11253 /* Two consecutive rotates adding up to the some integer
11254 multiple of the precision of the type can be ignored. */
11255 if (code
== RROTATE_EXPR
&& TREE_CODE (arg1
) == INTEGER_CST
11256 && TREE_CODE (arg0
) == RROTATE_EXPR
11257 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
11258 && wi::umod_trunc (wi::to_wide (arg1
)
11259 + wi::to_wide (TREE_OPERAND (arg0
, 1)),
11261 return fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 0));
11269 case TRUTH_ANDIF_EXPR
:
11270 /* Note that the operands of this must be ints
11271 and their values must be 0 or 1.
11272 ("true" is a fixed value perhaps depending on the language.) */
11273 /* If first arg is constant zero, return it. */
11274 if (integer_zerop (arg0
))
11275 return fold_convert_loc (loc
, type
, arg0
);
11277 case TRUTH_AND_EXPR
:
11278 /* If either arg is constant true, drop it. */
11279 if (TREE_CODE (arg0
) == INTEGER_CST
&& ! integer_zerop (arg0
))
11280 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg1
));
11281 if (TREE_CODE (arg1
) == INTEGER_CST
&& ! integer_zerop (arg1
)
11282 /* Preserve sequence points. */
11283 && (code
!= TRUTH_ANDIF_EXPR
|| ! TREE_SIDE_EFFECTS (arg0
)))
11284 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg0
));
11285 /* If second arg is constant zero, result is zero, but first arg
11286 must be evaluated. */
11287 if (integer_zerop (arg1
))
11288 return omit_one_operand_loc (loc
, type
, arg1
, arg0
);
11289 /* Likewise for first arg, but note that only the TRUTH_AND_EXPR
11290 case will be handled here. */
11291 if (integer_zerop (arg0
))
11292 return omit_one_operand_loc (loc
, type
, arg0
, arg1
);
11294 /* !X && X is always false. */
11295 if (TREE_CODE (arg0
) == TRUTH_NOT_EXPR
11296 && operand_equal_p (TREE_OPERAND (arg0
, 0), arg1
, 0))
11297 return omit_one_operand_loc (loc
, type
, integer_zero_node
, arg1
);
11298 /* X && !X is always false. */
11299 if (TREE_CODE (arg1
) == TRUTH_NOT_EXPR
11300 && operand_equal_p (arg0
, TREE_OPERAND (arg1
, 0), 0))
11301 return omit_one_operand_loc (loc
, type
, integer_zero_node
, arg0
);
11303 /* A < X && A + 1 > Y ==> A < X && A >= Y. Normally A + 1 > Y
11304 means A >= Y && A != MAX, but in this case we know that
11307 if (!TREE_SIDE_EFFECTS (arg0
)
11308 && !TREE_SIDE_EFFECTS (arg1
))
11310 tem
= fold_to_nonsharp_ineq_using_bound (loc
, arg0
, arg1
);
11311 if (tem
&& !operand_equal_p (tem
, arg0
, 0))
11312 return fold_build2_loc (loc
, code
, type
, tem
, arg1
);
11314 tem
= fold_to_nonsharp_ineq_using_bound (loc
, arg1
, arg0
);
11315 if (tem
&& !operand_equal_p (tem
, arg1
, 0))
11316 return fold_build2_loc (loc
, code
, type
, arg0
, tem
);
11319 if ((tem
= fold_truth_andor (loc
, code
, type
, arg0
, arg1
, op0
, op1
))
11325 case TRUTH_ORIF_EXPR
:
11326 /* Note that the operands of this must be ints
11327 and their values must be 0 or true.
11328 ("true" is a fixed value perhaps depending on the language.) */
11329 /* If first arg is constant true, return it. */
11330 if (TREE_CODE (arg0
) == INTEGER_CST
&& ! integer_zerop (arg0
))
11331 return fold_convert_loc (loc
, type
, arg0
);
11333 case TRUTH_OR_EXPR
:
11334 /* If either arg is constant zero, drop it. */
11335 if (TREE_CODE (arg0
) == INTEGER_CST
&& integer_zerop (arg0
))
11336 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg1
));
11337 if (TREE_CODE (arg1
) == INTEGER_CST
&& integer_zerop (arg1
)
11338 /* Preserve sequence points. */
11339 && (code
!= TRUTH_ORIF_EXPR
|| ! TREE_SIDE_EFFECTS (arg0
)))
11340 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg0
));
11341 /* If second arg is constant true, result is true, but we must
11342 evaluate first arg. */
11343 if (TREE_CODE (arg1
) == INTEGER_CST
&& ! integer_zerop (arg1
))
11344 return omit_one_operand_loc (loc
, type
, arg1
, arg0
);
11345 /* Likewise for first arg, but note this only occurs here for
11347 if (TREE_CODE (arg0
) == INTEGER_CST
&& ! integer_zerop (arg0
))
11348 return omit_one_operand_loc (loc
, type
, arg0
, arg1
);
11350 /* !X || X is always true. */
11351 if (TREE_CODE (arg0
) == TRUTH_NOT_EXPR
11352 && operand_equal_p (TREE_OPERAND (arg0
, 0), arg1
, 0))
11353 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg1
);
11354 /* X || !X is always true. */
11355 if (TREE_CODE (arg1
) == TRUTH_NOT_EXPR
11356 && operand_equal_p (arg0
, TREE_OPERAND (arg1
, 0), 0))
11357 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg0
);
11359 /* (X && !Y) || (!X && Y) is X ^ Y */
11360 if (TREE_CODE (arg0
) == TRUTH_AND_EXPR
11361 && TREE_CODE (arg1
) == TRUTH_AND_EXPR
)
11363 tree a0
, a1
, l0
, l1
, n0
, n1
;
11365 a0
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg1
, 0));
11366 a1
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg1
, 1));
11368 l0
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 0));
11369 l1
= fold_convert_loc (loc
, type
, TREE_OPERAND (arg0
, 1));
11371 n0
= fold_build1_loc (loc
, TRUTH_NOT_EXPR
, type
, l0
);
11372 n1
= fold_build1_loc (loc
, TRUTH_NOT_EXPR
, type
, l1
);
11374 if ((operand_equal_p (n0
, a0
, 0)
11375 && operand_equal_p (n1
, a1
, 0))
11376 || (operand_equal_p (n0
, a1
, 0)
11377 && operand_equal_p (n1
, a0
, 0)))
11378 return fold_build2_loc (loc
, TRUTH_XOR_EXPR
, type
, l0
, n1
);
11381 if ((tem
= fold_truth_andor (loc
, code
, type
, arg0
, arg1
, op0
, op1
))
11387 case TRUTH_XOR_EXPR
:
11388 /* If the second arg is constant zero, drop it. */
11389 if (integer_zerop (arg1
))
11390 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg0
));
11391 /* If the second arg is constant true, this is a logical inversion. */
11392 if (integer_onep (arg1
))
11394 tem
= invert_truthvalue_loc (loc
, arg0
);
11395 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, tem
));
11397 /* Identical arguments cancel to zero. */
11398 if (operand_equal_p (arg0
, arg1
, 0))
11399 return omit_one_operand_loc (loc
, type
, integer_zero_node
, arg0
);
11401 /* !X ^ X is always true. */
11402 if (TREE_CODE (arg0
) == TRUTH_NOT_EXPR
11403 && operand_equal_p (TREE_OPERAND (arg0
, 0), arg1
, 0))
11404 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg1
);
11406 /* X ^ !X is always true. */
11407 if (TREE_CODE (arg1
) == TRUTH_NOT_EXPR
11408 && operand_equal_p (arg0
, TREE_OPERAND (arg1
, 0), 0))
11409 return omit_one_operand_loc (loc
, type
, integer_one_node
, arg0
);
11418 tem
= fold_comparison (loc
, code
, type
, op0
, op1
);
11419 if (tem
!= NULL_TREE
)
11422 /* bool_var != 1 becomes !bool_var. */
11423 if (TREE_CODE (TREE_TYPE (arg0
)) == BOOLEAN_TYPE
&& integer_onep (arg1
)
11424 && code
== NE_EXPR
)
11425 return fold_convert_loc (loc
, type
,
11426 fold_build1_loc (loc
, TRUTH_NOT_EXPR
,
11427 TREE_TYPE (arg0
), arg0
));
11429 /* bool_var == 0 becomes !bool_var. */
11430 if (TREE_CODE (TREE_TYPE (arg0
)) == BOOLEAN_TYPE
&& integer_zerop (arg1
)
11431 && code
== EQ_EXPR
)
11432 return fold_convert_loc (loc
, type
,
11433 fold_build1_loc (loc
, TRUTH_NOT_EXPR
,
11434 TREE_TYPE (arg0
), arg0
));
11436 /* !exp != 0 becomes !exp */
11437 if (TREE_CODE (arg0
) == TRUTH_NOT_EXPR
&& integer_zerop (arg1
)
11438 && code
== NE_EXPR
)
11439 return non_lvalue_loc (loc
, fold_convert_loc (loc
, type
, arg0
));
11441 /* If this is an EQ or NE comparison with zero and ARG0 is
11442 (1 << foo) & bar, convert it to (bar >> foo) & 1. Both require
11443 two operations, but the latter can be done in one less insn
11444 on machines that have only two-operand insns or on which a
11445 constant cannot be the first operand. */
11446 if (TREE_CODE (arg0
) == BIT_AND_EXPR
11447 && integer_zerop (arg1
))
11449 tree arg00
= TREE_OPERAND (arg0
, 0);
11450 tree arg01
= TREE_OPERAND (arg0
, 1);
11451 if (TREE_CODE (arg00
) == LSHIFT_EXPR
11452 && integer_onep (TREE_OPERAND (arg00
, 0)))
11454 tree tem
= fold_build2_loc (loc
, RSHIFT_EXPR
, TREE_TYPE (arg00
),
11455 arg01
, TREE_OPERAND (arg00
, 1));
11456 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, TREE_TYPE (arg0
), tem
,
11457 build_int_cst (TREE_TYPE (arg0
), 1));
11458 return fold_build2_loc (loc
, code
, type
,
11459 fold_convert_loc (loc
, TREE_TYPE (arg1
), tem
),
11462 else if (TREE_CODE (arg01
) == LSHIFT_EXPR
11463 && integer_onep (TREE_OPERAND (arg01
, 0)))
11465 tree tem
= fold_build2_loc (loc
, RSHIFT_EXPR
, TREE_TYPE (arg01
),
11466 arg00
, TREE_OPERAND (arg01
, 1));
11467 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, TREE_TYPE (arg0
), tem
,
11468 build_int_cst (TREE_TYPE (arg0
), 1));
11469 return fold_build2_loc (loc
, code
, type
,
11470 fold_convert_loc (loc
, TREE_TYPE (arg1
), tem
),
11475 /* Fold ((X >> C1) & C2) == 0 and ((X >> C1) & C2) != 0 where
11476 C1 is a valid shift constant, and C2 is a power of two, i.e.
11478 if (TREE_CODE (arg0
) == BIT_AND_EXPR
11479 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == RSHIFT_EXPR
11480 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (arg0
, 0), 1))
11482 && integer_pow2p (TREE_OPERAND (arg0
, 1))
11483 && integer_zerop (arg1
))
11485 tree itype
= TREE_TYPE (arg0
);
11486 tree arg001
= TREE_OPERAND (TREE_OPERAND (arg0
, 0), 1);
11487 prec
= TYPE_PRECISION (itype
);
11489 /* Check for a valid shift count. */
11490 if (wi::ltu_p (wi::to_wide (arg001
), prec
))
11492 tree arg01
= TREE_OPERAND (arg0
, 1);
11493 tree arg000
= TREE_OPERAND (TREE_OPERAND (arg0
, 0), 0);
11494 unsigned HOST_WIDE_INT log2
= tree_log2 (arg01
);
11495 /* If (C2 << C1) doesn't overflow, then ((X >> C1) & C2) != 0
11496 can be rewritten as (X & (C2 << C1)) != 0. */
11497 if ((log2
+ TREE_INT_CST_LOW (arg001
)) < prec
)
11499 tem
= fold_build2_loc (loc
, LSHIFT_EXPR
, itype
, arg01
, arg001
);
11500 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, itype
, arg000
, tem
);
11501 return fold_build2_loc (loc
, code
, type
, tem
,
11502 fold_convert_loc (loc
, itype
, arg1
));
11504 /* Otherwise, for signed (arithmetic) shifts,
11505 ((X >> C1) & C2) != 0 is rewritten as X < 0, and
11506 ((X >> C1) & C2) == 0 is rewritten as X >= 0. */
11507 else if (!TYPE_UNSIGNED (itype
))
11508 return fold_build2_loc (loc
, code
== EQ_EXPR
? GE_EXPR
: LT_EXPR
, type
,
11509 arg000
, build_int_cst (itype
, 0));
11510 /* Otherwise, of unsigned (logical) shifts,
11511 ((X >> C1) & C2) != 0 is rewritten as (X,false), and
11512 ((X >> C1) & C2) == 0 is rewritten as (X,true). */
11514 return omit_one_operand_loc (loc
, type
,
11515 code
== EQ_EXPR
? integer_one_node
11516 : integer_zero_node
,
11521 /* If this is a comparison of a field, we may be able to simplify it. */
11522 if ((TREE_CODE (arg0
) == COMPONENT_REF
11523 || TREE_CODE (arg0
) == BIT_FIELD_REF
)
11524 /* Handle the constant case even without -O
11525 to make sure the warnings are given. */
11526 && (optimize
|| TREE_CODE (arg1
) == INTEGER_CST
))
11528 t1
= optimize_bit_field_compare (loc
, code
, type
, arg0
, arg1
);
11533 /* Optimize comparisons of strlen vs zero to a compare of the
11534 first character of the string vs zero. To wit,
11535 strlen(ptr) == 0 => *ptr == 0
11536 strlen(ptr) != 0 => *ptr != 0
11537 Other cases should reduce to one of these two (or a constant)
11538 due to the return value of strlen being unsigned. */
11539 if (TREE_CODE (arg0
) == CALL_EXPR
&& integer_zerop (arg1
))
11541 tree fndecl
= get_callee_fndecl (arg0
);
11544 && fndecl_built_in_p (fndecl
, BUILT_IN_STRLEN
)
11545 && call_expr_nargs (arg0
) == 1
11546 && (TREE_CODE (TREE_TYPE (CALL_EXPR_ARG (arg0
, 0)))
11550 = build_pointer_type (build_qualified_type (char_type_node
,
11552 tree ptr
= fold_convert_loc (loc
, ptrtype
,
11553 CALL_EXPR_ARG (arg0
, 0));
11554 tree iref
= build_fold_indirect_ref_loc (loc
, ptr
);
11555 return fold_build2_loc (loc
, code
, type
, iref
,
11556 build_int_cst (TREE_TYPE (iref
), 0));
11560 /* Fold (X >> C) != 0 into X < 0 if C is one less than the width
11561 of X. Similarly fold (X >> C) == 0 into X >= 0. */
11562 if (TREE_CODE (arg0
) == RSHIFT_EXPR
11563 && integer_zerop (arg1
)
11564 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == INTEGER_CST
)
11566 tree arg00
= TREE_OPERAND (arg0
, 0);
11567 tree arg01
= TREE_OPERAND (arg0
, 1);
11568 tree itype
= TREE_TYPE (arg00
);
11569 if (wi::to_wide (arg01
) == element_precision (itype
) - 1)
11571 if (TYPE_UNSIGNED (itype
))
11573 itype
= signed_type_for (itype
);
11574 arg00
= fold_convert_loc (loc
, itype
, arg00
);
11576 return fold_build2_loc (loc
, code
== EQ_EXPR
? GE_EXPR
: LT_EXPR
,
11577 type
, arg00
, build_zero_cst (itype
));
11581 /* Fold (~X & C) == 0 into (X & C) != 0 and (~X & C) != 0 into
11582 (X & C) == 0 when C is a single bit. */
11583 if (TREE_CODE (arg0
) == BIT_AND_EXPR
11584 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == BIT_NOT_EXPR
11585 && integer_zerop (arg1
)
11586 && integer_pow2p (TREE_OPERAND (arg0
, 1)))
11588 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, TREE_TYPE (arg0
),
11589 TREE_OPERAND (TREE_OPERAND (arg0
, 0), 0),
11590 TREE_OPERAND (arg0
, 1));
11591 return fold_build2_loc (loc
, code
== EQ_EXPR
? NE_EXPR
: EQ_EXPR
,
11593 fold_convert_loc (loc
, TREE_TYPE (arg0
),
11597 /* Fold ((X & C) ^ C) eq/ne 0 into (X & C) ne/eq 0, when the
11598 constant C is a power of two, i.e. a single bit. */
11599 if (TREE_CODE (arg0
) == BIT_XOR_EXPR
11600 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == BIT_AND_EXPR
11601 && integer_zerop (arg1
)
11602 && integer_pow2p (TREE_OPERAND (arg0
, 1))
11603 && operand_equal_p (TREE_OPERAND (TREE_OPERAND (arg0
, 0), 1),
11604 TREE_OPERAND (arg0
, 1), OEP_ONLY_CONST
))
11606 tree arg00
= TREE_OPERAND (arg0
, 0);
11607 return fold_build2_loc (loc
, code
== EQ_EXPR
? NE_EXPR
: EQ_EXPR
, type
,
11608 arg00
, build_int_cst (TREE_TYPE (arg00
), 0));
11611 /* Likewise, fold ((X ^ C) & C) eq/ne 0 into (X & C) ne/eq 0,
11612 when is C is a power of two, i.e. a single bit. */
11613 if (TREE_CODE (arg0
) == BIT_AND_EXPR
11614 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == BIT_XOR_EXPR
11615 && integer_zerop (arg1
)
11616 && integer_pow2p (TREE_OPERAND (arg0
, 1))
11617 && operand_equal_p (TREE_OPERAND (TREE_OPERAND (arg0
, 0), 1),
11618 TREE_OPERAND (arg0
, 1), OEP_ONLY_CONST
))
11620 tree arg000
= TREE_OPERAND (TREE_OPERAND (arg0
, 0), 0);
11621 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, TREE_TYPE (arg000
),
11622 arg000
, TREE_OPERAND (arg0
, 1));
11623 return fold_build2_loc (loc
, code
== EQ_EXPR
? NE_EXPR
: EQ_EXPR
, type
,
11624 tem
, build_int_cst (TREE_TYPE (tem
), 0));
11627 if (integer_zerop (arg1
)
11628 && tree_expr_nonzero_p (arg0
))
11630 tree res
= constant_boolean_node (code
==NE_EXPR
, type
);
11631 return omit_one_operand_loc (loc
, type
, res
, arg0
);
11634 /* Fold (X & C) op (Y & C) as (X ^ Y) & C op 0", and symmetries. */
11635 if (TREE_CODE (arg0
) == BIT_AND_EXPR
11636 && TREE_CODE (arg1
) == BIT_AND_EXPR
)
11638 tree arg00
= TREE_OPERAND (arg0
, 0);
11639 tree arg01
= TREE_OPERAND (arg0
, 1);
11640 tree arg10
= TREE_OPERAND (arg1
, 0);
11641 tree arg11
= TREE_OPERAND (arg1
, 1);
11642 tree itype
= TREE_TYPE (arg0
);
11644 if (operand_equal_p (arg01
, arg11
, 0))
11646 tem
= fold_convert_loc (loc
, itype
, arg10
);
11647 tem
= fold_build2_loc (loc
, BIT_XOR_EXPR
, itype
, arg00
, tem
);
11648 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, itype
, tem
, arg01
);
11649 return fold_build2_loc (loc
, code
, type
, tem
,
11650 build_zero_cst (itype
));
11652 if (operand_equal_p (arg01
, arg10
, 0))
11654 tem
= fold_convert_loc (loc
, itype
, arg11
);
11655 tem
= fold_build2_loc (loc
, BIT_XOR_EXPR
, itype
, arg00
, tem
);
11656 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, itype
, tem
, arg01
);
11657 return fold_build2_loc (loc
, code
, type
, tem
,
11658 build_zero_cst (itype
));
11660 if (operand_equal_p (arg00
, arg11
, 0))
11662 tem
= fold_convert_loc (loc
, itype
, arg10
);
11663 tem
= fold_build2_loc (loc
, BIT_XOR_EXPR
, itype
, arg01
, tem
);
11664 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, itype
, tem
, arg00
);
11665 return fold_build2_loc (loc
, code
, type
, tem
,
11666 build_zero_cst (itype
));
11668 if (operand_equal_p (arg00
, arg10
, 0))
11670 tem
= fold_convert_loc (loc
, itype
, arg11
);
11671 tem
= fold_build2_loc (loc
, BIT_XOR_EXPR
, itype
, arg01
, tem
);
11672 tem
= fold_build2_loc (loc
, BIT_AND_EXPR
, itype
, tem
, arg00
);
11673 return fold_build2_loc (loc
, code
, type
, tem
,
11674 build_zero_cst (itype
));
11678 if (TREE_CODE (arg0
) == BIT_XOR_EXPR
11679 && TREE_CODE (arg1
) == BIT_XOR_EXPR
)
11681 tree arg00
= TREE_OPERAND (arg0
, 0);
11682 tree arg01
= TREE_OPERAND (arg0
, 1);
11683 tree arg10
= TREE_OPERAND (arg1
, 0);
11684 tree arg11
= TREE_OPERAND (arg1
, 1);
11685 tree itype
= TREE_TYPE (arg0
);
11687 /* Optimize (X ^ Z) op (Y ^ Z) as X op Y, and symmetries.
11688 operand_equal_p guarantees no side-effects so we don't need
11689 to use omit_one_operand on Z. */
11690 if (operand_equal_p (arg01
, arg11
, 0))
11691 return fold_build2_loc (loc
, code
, type
, arg00
,
11692 fold_convert_loc (loc
, TREE_TYPE (arg00
),
11694 if (operand_equal_p (arg01
, arg10
, 0))
11695 return fold_build2_loc (loc
, code
, type
, arg00
,
11696 fold_convert_loc (loc
, TREE_TYPE (arg00
),
11698 if (operand_equal_p (arg00
, arg11
, 0))
11699 return fold_build2_loc (loc
, code
, type
, arg01
,
11700 fold_convert_loc (loc
, TREE_TYPE (arg01
),
11702 if (operand_equal_p (arg00
, arg10
, 0))
11703 return fold_build2_loc (loc
, code
, type
, arg01
,
11704 fold_convert_loc (loc
, TREE_TYPE (arg01
),
11707 /* Optimize (X ^ C1) op (Y ^ C2) as (X ^ (C1 ^ C2)) op Y. */
11708 if (TREE_CODE (arg01
) == INTEGER_CST
11709 && TREE_CODE (arg11
) == INTEGER_CST
)
11711 tem
= fold_build2_loc (loc
, BIT_XOR_EXPR
, itype
, arg01
,
11712 fold_convert_loc (loc
, itype
, arg11
));
11713 tem
= fold_build2_loc (loc
, BIT_XOR_EXPR
, itype
, arg00
, tem
);
11714 return fold_build2_loc (loc
, code
, type
, tem
,
11715 fold_convert_loc (loc
, itype
, arg10
));
11719 /* Attempt to simplify equality/inequality comparisons of complex
11720 values. Only lower the comparison if the result is known or
11721 can be simplified to a single scalar comparison. */
11722 if ((TREE_CODE (arg0
) == COMPLEX_EXPR
11723 || TREE_CODE (arg0
) == COMPLEX_CST
)
11724 && (TREE_CODE (arg1
) == COMPLEX_EXPR
11725 || TREE_CODE (arg1
) == COMPLEX_CST
))
11727 tree real0
, imag0
, real1
, imag1
;
11730 if (TREE_CODE (arg0
) == COMPLEX_EXPR
)
11732 real0
= TREE_OPERAND (arg0
, 0);
11733 imag0
= TREE_OPERAND (arg0
, 1);
11737 real0
= TREE_REALPART (arg0
);
11738 imag0
= TREE_IMAGPART (arg0
);
11741 if (TREE_CODE (arg1
) == COMPLEX_EXPR
)
11743 real1
= TREE_OPERAND (arg1
, 0);
11744 imag1
= TREE_OPERAND (arg1
, 1);
11748 real1
= TREE_REALPART (arg1
);
11749 imag1
= TREE_IMAGPART (arg1
);
11752 rcond
= fold_binary_loc (loc
, code
, type
, real0
, real1
);
11753 if (rcond
&& TREE_CODE (rcond
) == INTEGER_CST
)
11755 if (integer_zerop (rcond
))
11757 if (code
== EQ_EXPR
)
11758 return omit_two_operands_loc (loc
, type
, boolean_false_node
,
11760 return fold_build2_loc (loc
, NE_EXPR
, type
, imag0
, imag1
);
11764 if (code
== NE_EXPR
)
11765 return omit_two_operands_loc (loc
, type
, boolean_true_node
,
11767 return fold_build2_loc (loc
, EQ_EXPR
, type
, imag0
, imag1
);
11771 icond
= fold_binary_loc (loc
, code
, type
, imag0
, imag1
);
11772 if (icond
&& TREE_CODE (icond
) == INTEGER_CST
)
11774 if (integer_zerop (icond
))
11776 if (code
== EQ_EXPR
)
11777 return omit_two_operands_loc (loc
, type
, boolean_false_node
,
11779 return fold_build2_loc (loc
, NE_EXPR
, type
, real0
, real1
);
11783 if (code
== NE_EXPR
)
11784 return omit_two_operands_loc (loc
, type
, boolean_true_node
,
11786 return fold_build2_loc (loc
, EQ_EXPR
, type
, real0
, real1
);
11797 tem
= fold_comparison (loc
, code
, type
, op0
, op1
);
11798 if (tem
!= NULL_TREE
)
11801 /* Transform comparisons of the form X +- C CMP X. */
11802 if ((TREE_CODE (arg0
) == PLUS_EXPR
|| TREE_CODE (arg0
) == MINUS_EXPR
)
11803 && operand_equal_p (TREE_OPERAND (arg0
, 0), arg1
, 0)
11804 && TREE_CODE (TREE_OPERAND (arg0
, 1)) == REAL_CST
11805 && !HONOR_SNANS (arg0
))
11807 tree arg01
= TREE_OPERAND (arg0
, 1);
11808 enum tree_code code0
= TREE_CODE (arg0
);
11809 int is_positive
= REAL_VALUE_NEGATIVE (TREE_REAL_CST (arg01
)) ? -1 : 1;
11811 /* (X - c) > X becomes false. */
11812 if (code
== GT_EXPR
11813 && ((code0
== MINUS_EXPR
&& is_positive
>= 0)
11814 || (code0
== PLUS_EXPR
&& is_positive
<= 0)))
11815 return constant_boolean_node (0, type
);
11817 /* Likewise (X + c) < X becomes false. */
11818 if (code
== LT_EXPR
11819 && ((code0
== PLUS_EXPR
&& is_positive
>= 0)
11820 || (code0
== MINUS_EXPR
&& is_positive
<= 0)))
11821 return constant_boolean_node (0, type
);
11823 /* Convert (X - c) <= X to true. */
11824 if (!HONOR_NANS (arg1
)
11826 && ((code0
== MINUS_EXPR
&& is_positive
>= 0)
11827 || (code0
== PLUS_EXPR
&& is_positive
<= 0)))
11828 return constant_boolean_node (1, type
);
11830 /* Convert (X + c) >= X to true. */
11831 if (!HONOR_NANS (arg1
)
11833 && ((code0
== PLUS_EXPR
&& is_positive
>= 0)
11834 || (code0
== MINUS_EXPR
&& is_positive
<= 0)))
11835 return constant_boolean_node (1, type
);
11838 /* If we are comparing an ABS_EXPR with a constant, we can
11839 convert all the cases into explicit comparisons, but they may
11840 well not be faster than doing the ABS and one comparison.
11841 But ABS (X) <= C is a range comparison, which becomes a subtraction
11842 and a comparison, and is probably faster. */
11843 if (code
== LE_EXPR
11844 && TREE_CODE (arg1
) == INTEGER_CST
11845 && TREE_CODE (arg0
) == ABS_EXPR
11846 && ! TREE_SIDE_EFFECTS (arg0
)
11847 && (tem
= negate_expr (arg1
)) != 0
11848 && TREE_CODE (tem
) == INTEGER_CST
11849 && !TREE_OVERFLOW (tem
))
11850 return fold_build2_loc (loc
, TRUTH_ANDIF_EXPR
, type
,
11851 build2 (GE_EXPR
, type
,
11852 TREE_OPERAND (arg0
, 0), tem
),
11853 build2 (LE_EXPR
, type
,
11854 TREE_OPERAND (arg0
, 0), arg1
));
11856 /* Convert ABS_EXPR<x> >= 0 to true. */
11857 strict_overflow_p
= false;
11858 if (code
== GE_EXPR
11859 && (integer_zerop (arg1
)
11860 || (! HONOR_NANS (arg0
)
11861 && real_zerop (arg1
)))
11862 && tree_expr_nonnegative_warnv_p (arg0
, &strict_overflow_p
))
11864 if (strict_overflow_p
)
11865 fold_overflow_warning (("assuming signed overflow does not occur "
11866 "when simplifying comparison of "
11867 "absolute value and zero"),
11868 WARN_STRICT_OVERFLOW_CONDITIONAL
);
11869 return omit_one_operand_loc (loc
, type
,
11870 constant_boolean_node (true, type
),
11874 /* Convert ABS_EXPR<x> < 0 to false. */
11875 strict_overflow_p
= false;
11876 if (code
== LT_EXPR
11877 && (integer_zerop (arg1
) || real_zerop (arg1
))
11878 && tree_expr_nonnegative_warnv_p (arg0
, &strict_overflow_p
))
11880 if (strict_overflow_p
)
11881 fold_overflow_warning (("assuming signed overflow does not occur "
11882 "when simplifying comparison of "
11883 "absolute value and zero"),
11884 WARN_STRICT_OVERFLOW_CONDITIONAL
);
11885 return omit_one_operand_loc (loc
, type
,
11886 constant_boolean_node (false, type
),
11890 /* If X is unsigned, convert X < (1 << Y) into X >> Y == 0
11891 and similarly for >= into !=. */
11892 if ((code
== LT_EXPR
|| code
== GE_EXPR
)
11893 && TYPE_UNSIGNED (TREE_TYPE (arg0
))
11894 && TREE_CODE (arg1
) == LSHIFT_EXPR
11895 && integer_onep (TREE_OPERAND (arg1
, 0)))
11896 return build2_loc (loc
, code
== LT_EXPR
? EQ_EXPR
: NE_EXPR
, type
,
11897 build2 (RSHIFT_EXPR
, TREE_TYPE (arg0
), arg0
,
11898 TREE_OPERAND (arg1
, 1)),
11899 build_zero_cst (TREE_TYPE (arg0
)));
11901 /* Similarly for X < (cast) (1 << Y). But cast can't be narrowing,
11902 otherwise Y might be >= # of bits in X's type and thus e.g.
11903 (unsigned char) (1 << Y) for Y 15 might be 0.
11904 If the cast is widening, then 1 << Y should have unsigned type,
11905 otherwise if Y is number of bits in the signed shift type minus 1,
11906 we can't optimize this. E.g. (unsigned long long) (1 << Y) for Y
11907 31 might be 0xffffffff80000000. */
11908 if ((code
== LT_EXPR
|| code
== GE_EXPR
)
11909 && TYPE_UNSIGNED (TREE_TYPE (arg0
))
11910 && CONVERT_EXPR_P (arg1
)
11911 && TREE_CODE (TREE_OPERAND (arg1
, 0)) == LSHIFT_EXPR
11912 && (element_precision (TREE_TYPE (arg1
))
11913 >= element_precision (TREE_TYPE (TREE_OPERAND (arg1
, 0))))
11914 && (TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (arg1
, 0)))
11915 || (element_precision (TREE_TYPE (arg1
))
11916 == element_precision (TREE_TYPE (TREE_OPERAND (arg1
, 0)))))
11917 && integer_onep (TREE_OPERAND (TREE_OPERAND (arg1
, 0), 0)))
11919 tem
= build2 (RSHIFT_EXPR
, TREE_TYPE (arg0
), arg0
,
11920 TREE_OPERAND (TREE_OPERAND (arg1
, 0), 1));
11921 return build2_loc (loc
, code
== LT_EXPR
? EQ_EXPR
: NE_EXPR
, type
,
11922 fold_convert_loc (loc
, TREE_TYPE (arg0
), tem
),
11923 build_zero_cst (TREE_TYPE (arg0
)));
11928 case UNORDERED_EXPR
:
11936 /* Fold (double)float1 CMP (double)float2 into float1 CMP float2. */
11938 tree targ0
= strip_float_extensions (arg0
);
11939 tree targ1
= strip_float_extensions (arg1
);
11940 tree newtype
= TREE_TYPE (targ0
);
11942 if (TYPE_PRECISION (TREE_TYPE (targ1
)) > TYPE_PRECISION (newtype
))
11943 newtype
= TREE_TYPE (targ1
);
11945 if (TYPE_PRECISION (newtype
) < TYPE_PRECISION (TREE_TYPE (arg0
)))
11946 return fold_build2_loc (loc
, code
, type
,
11947 fold_convert_loc (loc
, newtype
, targ0
),
11948 fold_convert_loc (loc
, newtype
, targ1
));
11953 case COMPOUND_EXPR
:
11954 /* When pedantic, a compound expression can be neither an lvalue
11955 nor an integer constant expression. */
11956 if (TREE_SIDE_EFFECTS (arg0
) || TREE_CONSTANT (arg1
))
11958 /* Don't let (0, 0) be null pointer constant. */
11959 tem
= integer_zerop (arg1
) ? build1 (NOP_EXPR
, type
, arg1
)
11960 : fold_convert_loc (loc
, type
, arg1
);
11961 return pedantic_non_lvalue_loc (loc
, tem
);
11964 /* An ASSERT_EXPR should never be passed to fold_binary. */
11965 gcc_unreachable ();
11969 } /* switch (code) */
11972 /* For constants M and N, if M == (1LL << cst) - 1 && (N & M) == M,
11973 ((A & N) + B) & M -> (A + B) & M
11974 Similarly if (N & M) == 0,
11975 ((A | N) + B) & M -> (A + B) & M
11976 and for - instead of + (or unary - instead of +)
11977 and/or ^ instead of |.
11978 If B is constant and (B & M) == 0, fold into A & M.
11980 This function is a helper for match.pd patterns. Return non-NULL
11981 type in which the simplified operation should be performed only
11982 if any optimization is possible.
11984 ARG1 is M above, ARG00 is left operand of +/-, if CODE00 is BIT_*_EXPR,
11985 then ARG00{0,1} are operands of that bitop, otherwise CODE00 is ERROR_MARK.
11986 Similarly for ARG01, CODE01 and ARG01{0,1}, just for the right operand of
11989 fold_bit_and_mask (tree type
, tree arg1
, enum tree_code code
,
11990 tree arg00
, enum tree_code code00
, tree arg000
, tree arg001
,
11991 tree arg01
, enum tree_code code01
, tree arg010
, tree arg011
,
11994 gcc_assert (TREE_CODE (arg1
) == INTEGER_CST
);
11995 gcc_assert (code
== PLUS_EXPR
|| code
== MINUS_EXPR
|| code
== NEGATE_EXPR
);
11996 wi::tree_to_wide_ref cst1
= wi::to_wide (arg1
);
11998 || (cst1
& (cst1
+ 1)) != 0
11999 || !INTEGRAL_TYPE_P (type
)
12000 || (!TYPE_OVERFLOW_WRAPS (type
)
12001 && TREE_CODE (type
) != INTEGER_TYPE
)
12002 || (wi::max_value (type
) & cst1
) != cst1
)
12005 enum tree_code codes
[2] = { code00
, code01
};
12006 tree arg0xx
[4] = { arg000
, arg001
, arg010
, arg011
};
12010 /* Now we know that arg0 is (C + D) or (C - D) or -C and
12011 arg1 (M) is == (1LL << cst) - 1.
12012 Store C into PMOP[0] and D into PMOP[1]. */
12015 which
= code
!= NEGATE_EXPR
;
12017 for (; which
>= 0; which
--)
12018 switch (codes
[which
])
12023 gcc_assert (TREE_CODE (arg0xx
[2 * which
+ 1]) == INTEGER_CST
);
12024 cst0
= wi::to_wide (arg0xx
[2 * which
+ 1]) & cst1
;
12025 if (codes
[which
] == BIT_AND_EXPR
)
12030 else if (cst0
!= 0)
12032 /* If C or D is of the form (A & N) where
12033 (N & M) == M, or of the form (A | N) or
12034 (A ^ N) where (N & M) == 0, replace it with A. */
12035 pmop
[which
] = arg0xx
[2 * which
];
12038 if (TREE_CODE (pmop
[which
]) != INTEGER_CST
)
12040 /* If C or D is a N where (N & M) == 0, it can be
12041 omitted (replaced with 0). */
12042 if ((code
== PLUS_EXPR
12043 || (code
== MINUS_EXPR
&& which
== 0))
12044 && (cst1
& wi::to_wide (pmop
[which
])) == 0)
12045 pmop
[which
] = build_int_cst (type
, 0);
12046 /* Similarly, with C - N where (-N & M) == 0. */
12047 if (code
== MINUS_EXPR
12049 && (cst1
& -wi::to_wide (pmop
[which
])) == 0)
12050 pmop
[which
] = build_int_cst (type
, 0);
12053 gcc_unreachable ();
12056 /* Only build anything new if we optimized one or both arguments above. */
12057 if (pmop
[0] == arg00
&& pmop
[1] == arg01
)
12060 if (TYPE_OVERFLOW_WRAPS (type
))
12063 return unsigned_type_for (type
);
12066 /* Used by contains_label_[p1]. */
12068 struct contains_label_data
12070 hash_set
<tree
> *pset
;
12071 bool inside_switch_p
;
12074 /* Callback for walk_tree, looking for LABEL_EXPR. Return *TP if it is
12075 a LABEL_EXPR or CASE_LABEL_EXPR not inside of another SWITCH_EXPR; otherwise
12076 return NULL_TREE. Do not check the subtrees of GOTO_EXPR. */
12079 contains_label_1 (tree
*tp
, int *walk_subtrees
, void *data
)
12081 contains_label_data
*d
= (contains_label_data
*) data
;
12082 switch (TREE_CODE (*tp
))
12087 case CASE_LABEL_EXPR
:
12088 if (!d
->inside_switch_p
)
12093 if (!d
->inside_switch_p
)
12095 if (walk_tree (&SWITCH_COND (*tp
), contains_label_1
, data
, d
->pset
))
12097 d
->inside_switch_p
= true;
12098 if (walk_tree (&SWITCH_BODY (*tp
), contains_label_1
, data
, d
->pset
))
12100 d
->inside_switch_p
= false;
12101 *walk_subtrees
= 0;
12106 *walk_subtrees
= 0;
12114 /* Return whether the sub-tree ST contains a label which is accessible from
12115 outside the sub-tree. */
12118 contains_label_p (tree st
)
12120 hash_set
<tree
> pset
;
12121 contains_label_data data
= { &pset
, false };
12122 return walk_tree (&st
, contains_label_1
, &data
, &pset
) != NULL_TREE
;
12125 /* Fold a ternary expression of code CODE and type TYPE with operands
12126 OP0, OP1, and OP2. Return the folded expression if folding is
12127 successful. Otherwise, return NULL_TREE. */
12130 fold_ternary_loc (location_t loc
, enum tree_code code
, tree type
,
12131 tree op0
, tree op1
, tree op2
)
12134 tree arg0
= NULL_TREE
, arg1
= NULL_TREE
, arg2
= NULL_TREE
;
12135 enum tree_code_class kind
= TREE_CODE_CLASS (code
);
12137 gcc_assert (IS_EXPR_CODE_CLASS (kind
)
12138 && TREE_CODE_LENGTH (code
) == 3);
12140 /* If this is a commutative operation, and OP0 is a constant, move it
12141 to OP1 to reduce the number of tests below. */
12142 if (commutative_ternary_tree_code (code
)
12143 && tree_swap_operands_p (op0
, op1
))
12144 return fold_build3_loc (loc
, code
, type
, op1
, op0
, op2
);
12146 tem
= generic_simplify (loc
, code
, type
, op0
, op1
, op2
);
12150 /* Strip any conversions that don't change the mode. This is safe
12151 for every expression, except for a comparison expression because
12152 its signedness is derived from its operands. So, in the latter
12153 case, only strip conversions that don't change the signedness.
12155 Note that this is done as an internal manipulation within the
12156 constant folder, in order to find the simplest representation of
12157 the arguments so that their form can be studied. In any cases,
12158 the appropriate type conversions should be put back in the tree
12159 that will get out of the constant folder. */
12180 case COMPONENT_REF
:
12181 if (TREE_CODE (arg0
) == CONSTRUCTOR
12182 && ! type_contains_placeholder_p (TREE_TYPE (arg0
)))
12184 unsigned HOST_WIDE_INT idx
;
12186 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (arg0
), idx
, field
, value
)
12193 case VEC_COND_EXPR
:
12194 /* Pedantic ANSI C says that a conditional expression is never an lvalue,
12195 so all simple results must be passed through pedantic_non_lvalue. */
12196 if (TREE_CODE (arg0
) == INTEGER_CST
)
12198 tree unused_op
= integer_zerop (arg0
) ? op1
: op2
;
12199 tem
= integer_zerop (arg0
) ? op2
: op1
;
12200 /* Only optimize constant conditions when the selected branch
12201 has the same type as the COND_EXPR. This avoids optimizing
12202 away "c ? x : throw", where the throw has a void type.
12203 Avoid throwing away that operand which contains label. */
12204 if ((!TREE_SIDE_EFFECTS (unused_op
)
12205 || !contains_label_p (unused_op
))
12206 && (! VOID_TYPE_P (TREE_TYPE (tem
))
12207 || VOID_TYPE_P (type
)))
12208 return pedantic_non_lvalue_loc (loc
, tem
);
12211 else if (TREE_CODE (arg0
) == VECTOR_CST
)
12213 unsigned HOST_WIDE_INT nelts
;
12214 if ((TREE_CODE (arg1
) == VECTOR_CST
12215 || TREE_CODE (arg1
) == CONSTRUCTOR
)
12216 && (TREE_CODE (arg2
) == VECTOR_CST
12217 || TREE_CODE (arg2
) == CONSTRUCTOR
)
12218 && TYPE_VECTOR_SUBPARTS (type
).is_constant (&nelts
))
12220 vec_perm_builder
sel (nelts
, nelts
, 1);
12221 for (unsigned int i
= 0; i
< nelts
; i
++)
12223 tree val
= VECTOR_CST_ELT (arg0
, i
);
12224 if (integer_all_onesp (val
))
12225 sel
.quick_push (i
);
12226 else if (integer_zerop (val
))
12227 sel
.quick_push (nelts
+ i
);
12228 else /* Currently unreachable. */
12231 vec_perm_indices
indices (sel
, 2, nelts
);
12232 tree t
= fold_vec_perm (type
, arg1
, arg2
, indices
);
12233 if (t
!= NULL_TREE
)
12238 /* If we have A op B ? A : C, we may be able to convert this to a
12239 simpler expression, depending on the operation and the values
12240 of B and C. Signed zeros prevent all of these transformations,
12241 for reasons given above each one.
12243 Also try swapping the arguments and inverting the conditional. */
12244 if (COMPARISON_CLASS_P (arg0
)
12245 && operand_equal_for_comparison_p (TREE_OPERAND (arg0
, 0), op1
)
12246 && !HONOR_SIGNED_ZEROS (element_mode (op1
)))
12248 tem
= fold_cond_expr_with_comparison (loc
, type
, arg0
, op1
, op2
);
12253 if (COMPARISON_CLASS_P (arg0
)
12254 && operand_equal_for_comparison_p (TREE_OPERAND (arg0
, 0), op2
)
12255 && !HONOR_SIGNED_ZEROS (element_mode (op2
)))
12257 location_t loc0
= expr_location_or (arg0
, loc
);
12258 tem
= fold_invert_truthvalue (loc0
, arg0
);
12259 if (tem
&& COMPARISON_CLASS_P (tem
))
12261 tem
= fold_cond_expr_with_comparison (loc
, type
, tem
, op2
, op1
);
12267 /* If the second operand is simpler than the third, swap them
12268 since that produces better jump optimization results. */
12269 if (truth_value_p (TREE_CODE (arg0
))
12270 && tree_swap_operands_p (op1
, op2
))
12272 location_t loc0
= expr_location_or (arg0
, loc
);
12273 /* See if this can be inverted. If it can't, possibly because
12274 it was a floating-point inequality comparison, don't do
12276 tem
= fold_invert_truthvalue (loc0
, arg0
);
12278 return fold_build3_loc (loc
, code
, type
, tem
, op2
, op1
);
12281 /* Convert A ? 1 : 0 to simply A. */
12282 if ((code
== VEC_COND_EXPR
? integer_all_onesp (op1
)
12283 : (integer_onep (op1
)
12284 && !VECTOR_TYPE_P (type
)))
12285 && integer_zerop (op2
)
12286 /* If we try to convert OP0 to our type, the
12287 call to fold will try to move the conversion inside
12288 a COND, which will recurse. In that case, the COND_EXPR
12289 is probably the best choice, so leave it alone. */
12290 && type
== TREE_TYPE (arg0
))
12291 return pedantic_non_lvalue_loc (loc
, arg0
);
12293 /* Convert A ? 0 : 1 to !A. This prefers the use of NOT_EXPR
12294 over COND_EXPR in cases such as floating point comparisons. */
12295 if (integer_zerop (op1
)
12296 && code
== COND_EXPR
12297 && integer_onep (op2
)
12298 && !VECTOR_TYPE_P (type
)
12299 && truth_value_p (TREE_CODE (arg0
)))
12300 return pedantic_non_lvalue_loc (loc
,
12301 fold_convert_loc (loc
, type
,
12302 invert_truthvalue_loc (loc
,
12305 /* A < 0 ? <sign bit of A> : 0 is simply (A & <sign bit of A>). */
12306 if (TREE_CODE (arg0
) == LT_EXPR
12307 && integer_zerop (TREE_OPERAND (arg0
, 1))
12308 && integer_zerop (op2
)
12309 && (tem
= sign_bit_p (TREE_OPERAND (arg0
, 0), arg1
)))
12311 /* sign_bit_p looks through both zero and sign extensions,
12312 but for this optimization only sign extensions are
12314 tree tem2
= TREE_OPERAND (arg0
, 0);
12315 while (tem
!= tem2
)
12317 if (TREE_CODE (tem2
) != NOP_EXPR
12318 || TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (tem2
, 0))))
12323 tem2
= TREE_OPERAND (tem2
, 0);
12325 /* sign_bit_p only checks ARG1 bits within A's precision.
12326 If <sign bit of A> has wider type than A, bits outside
12327 of A's precision in <sign bit of A> need to be checked.
12328 If they are all 0, this optimization needs to be done
12329 in unsigned A's type, if they are all 1 in signed A's type,
12330 otherwise this can't be done. */
12332 && TYPE_PRECISION (TREE_TYPE (tem
))
12333 < TYPE_PRECISION (TREE_TYPE (arg1
))
12334 && TYPE_PRECISION (TREE_TYPE (tem
))
12335 < TYPE_PRECISION (type
))
12337 int inner_width
, outer_width
;
12340 inner_width
= TYPE_PRECISION (TREE_TYPE (tem
));
12341 outer_width
= TYPE_PRECISION (TREE_TYPE (arg1
));
12342 if (outer_width
> TYPE_PRECISION (type
))
12343 outer_width
= TYPE_PRECISION (type
);
12345 wide_int mask
= wi::shifted_mask
12346 (inner_width
, outer_width
- inner_width
, false,
12347 TYPE_PRECISION (TREE_TYPE (arg1
)));
12349 wide_int common
= mask
& wi::to_wide (arg1
);
12350 if (common
== mask
)
12352 tem_type
= signed_type_for (TREE_TYPE (tem
));
12353 tem
= fold_convert_loc (loc
, tem_type
, tem
);
12355 else if (common
== 0)
12357 tem_type
= unsigned_type_for (TREE_TYPE (tem
));
12358 tem
= fold_convert_loc (loc
, tem_type
, tem
);
12366 fold_convert_loc (loc
, type
,
12367 fold_build2_loc (loc
, BIT_AND_EXPR
,
12368 TREE_TYPE (tem
), tem
,
12369 fold_convert_loc (loc
,
12374 /* (A >> N) & 1 ? (1 << N) : 0 is simply A & (1 << N). A & 1 was
12375 already handled above. */
12376 if (TREE_CODE (arg0
) == BIT_AND_EXPR
12377 && integer_onep (TREE_OPERAND (arg0
, 1))
12378 && integer_zerop (op2
)
12379 && integer_pow2p (arg1
))
12381 tree tem
= TREE_OPERAND (arg0
, 0);
12383 if (TREE_CODE (tem
) == RSHIFT_EXPR
12384 && tree_fits_uhwi_p (TREE_OPERAND (tem
, 1))
12385 && (unsigned HOST_WIDE_INT
) tree_log2 (arg1
)
12386 == tree_to_uhwi (TREE_OPERAND (tem
, 1)))
12387 return fold_build2_loc (loc
, BIT_AND_EXPR
, type
,
12388 fold_convert_loc (loc
, type
,
12389 TREE_OPERAND (tem
, 0)),
12393 /* A & N ? N : 0 is simply A & N if N is a power of two. This
12394 is probably obsolete because the first operand should be a
12395 truth value (that's why we have the two cases above), but let's
12396 leave it in until we can confirm this for all front-ends. */
12397 if (integer_zerop (op2
)
12398 && TREE_CODE (arg0
) == NE_EXPR
12399 && integer_zerop (TREE_OPERAND (arg0
, 1))
12400 && integer_pow2p (arg1
)
12401 && TREE_CODE (TREE_OPERAND (arg0
, 0)) == BIT_AND_EXPR
12402 && operand_equal_p (TREE_OPERAND (TREE_OPERAND (arg0
, 0), 1),
12403 arg1
, OEP_ONLY_CONST
)
12404 /* operand_equal_p compares just value, not precision, so e.g.
12405 arg1 could be 8-bit -128 and be power of two, but BIT_AND_EXPR
12406 second operand 32-bit -128, which is not a power of two (or vice
12408 && integer_pow2p (TREE_OPERAND (TREE_OPERAND (arg0
, 0), 1)))
12409 return pedantic_non_lvalue_loc (loc
,
12410 fold_convert_loc (loc
, type
,
12411 TREE_OPERAND (arg0
,
12414 /* Disable the transformations below for vectors, since
12415 fold_binary_op_with_conditional_arg may undo them immediately,
12416 yielding an infinite loop. */
12417 if (code
== VEC_COND_EXPR
)
12420 /* Convert A ? B : 0 into A && B if A and B are truth values. */
12421 if (integer_zerop (op2
)
12422 && truth_value_p (TREE_CODE (arg0
))
12423 && truth_value_p (TREE_CODE (arg1
))
12424 && (code
== VEC_COND_EXPR
|| !VECTOR_TYPE_P (type
)))
12425 return fold_build2_loc (loc
, code
== VEC_COND_EXPR
? BIT_AND_EXPR
12426 : TRUTH_ANDIF_EXPR
,
12427 type
, fold_convert_loc (loc
, type
, arg0
), op1
);
12429 /* Convert A ? B : 1 into !A || B if A and B are truth values. */
12430 if (code
== VEC_COND_EXPR
? integer_all_onesp (op2
) : integer_onep (op2
)
12431 && truth_value_p (TREE_CODE (arg0
))
12432 && truth_value_p (TREE_CODE (arg1
))
12433 && (code
== VEC_COND_EXPR
|| !VECTOR_TYPE_P (type
)))
12435 location_t loc0
= expr_location_or (arg0
, loc
);
12436 /* Only perform transformation if ARG0 is easily inverted. */
12437 tem
= fold_invert_truthvalue (loc0
, arg0
);
12439 return fold_build2_loc (loc
, code
== VEC_COND_EXPR
12442 type
, fold_convert_loc (loc
, type
, tem
),
12446 /* Convert A ? 0 : B into !A && B if A and B are truth values. */
12447 if (integer_zerop (arg1
)
12448 && truth_value_p (TREE_CODE (arg0
))
12449 && truth_value_p (TREE_CODE (op2
))
12450 && (code
== VEC_COND_EXPR
|| !VECTOR_TYPE_P (type
)))
12452 location_t loc0
= expr_location_or (arg0
, loc
);
12453 /* Only perform transformation if ARG0 is easily inverted. */
12454 tem
= fold_invert_truthvalue (loc0
, arg0
);
12456 return fold_build2_loc (loc
, code
== VEC_COND_EXPR
12457 ? BIT_AND_EXPR
: TRUTH_ANDIF_EXPR
,
12458 type
, fold_convert_loc (loc
, type
, tem
),
12462 /* Convert A ? 1 : B into A || B if A and B are truth values. */
12463 if (code
== VEC_COND_EXPR
? integer_all_onesp (arg1
) : integer_onep (arg1
)
12464 && truth_value_p (TREE_CODE (arg0
))
12465 && truth_value_p (TREE_CODE (op2
))
12466 && (code
== VEC_COND_EXPR
|| !VECTOR_TYPE_P (type
)))
12467 return fold_build2_loc (loc
, code
== VEC_COND_EXPR
12468 ? BIT_IOR_EXPR
: TRUTH_ORIF_EXPR
,
12469 type
, fold_convert_loc (loc
, type
, arg0
), op2
);
12474 /* CALL_EXPRs used to be ternary exprs. Catch any mistaken uses
12475 of fold_ternary on them. */
12476 gcc_unreachable ();
12478 case BIT_FIELD_REF
:
12479 if (TREE_CODE (arg0
) == VECTOR_CST
12480 && (type
== TREE_TYPE (TREE_TYPE (arg0
))
12481 || (VECTOR_TYPE_P (type
)
12482 && TREE_TYPE (type
) == TREE_TYPE (TREE_TYPE (arg0
))))
12483 && tree_fits_uhwi_p (op1
)
12484 && tree_fits_uhwi_p (op2
))
12486 tree eltype
= TREE_TYPE (TREE_TYPE (arg0
));
12487 unsigned HOST_WIDE_INT width
= tree_to_uhwi (TYPE_SIZE (eltype
));
12488 unsigned HOST_WIDE_INT n
= tree_to_uhwi (arg1
);
12489 unsigned HOST_WIDE_INT idx
= tree_to_uhwi (op2
);
12492 && (idx
% width
) == 0
12493 && (n
% width
) == 0
12494 && known_le ((idx
+ n
) / width
,
12495 TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg0
))))
12500 if (TREE_CODE (arg0
) == VECTOR_CST
)
12504 tem
= VECTOR_CST_ELT (arg0
, idx
);
12505 if (VECTOR_TYPE_P (type
))
12506 tem
= fold_build1 (VIEW_CONVERT_EXPR
, type
, tem
);
12510 tree_vector_builder
vals (type
, n
, 1);
12511 for (unsigned i
= 0; i
< n
; ++i
)
12512 vals
.quick_push (VECTOR_CST_ELT (arg0
, idx
+ i
));
12513 return vals
.build ();
12518 /* On constants we can use native encode/interpret to constant
12519 fold (nearly) all BIT_FIELD_REFs. */
12520 if (CONSTANT_CLASS_P (arg0
)
12521 && can_native_interpret_type_p (type
)
12522 && BITS_PER_UNIT
== 8
12523 && tree_fits_uhwi_p (op1
)
12524 && tree_fits_uhwi_p (op2
))
12526 unsigned HOST_WIDE_INT bitpos
= tree_to_uhwi (op2
);
12527 unsigned HOST_WIDE_INT bitsize
= tree_to_uhwi (op1
);
12528 /* Limit us to a reasonable amount of work. To relax the
12529 other limitations we need bit-shifting of the buffer
12530 and rounding up the size. */
12531 if (bitpos
% BITS_PER_UNIT
== 0
12532 && bitsize
% BITS_PER_UNIT
== 0
12533 && bitsize
<= MAX_BITSIZE_MODE_ANY_MODE
)
12535 unsigned char b
[MAX_BITSIZE_MODE_ANY_MODE
/ BITS_PER_UNIT
];
12536 unsigned HOST_WIDE_INT len
12537 = native_encode_expr (arg0
, b
, bitsize
/ BITS_PER_UNIT
,
12538 bitpos
/ BITS_PER_UNIT
);
12540 && len
* BITS_PER_UNIT
>= bitsize
)
12542 tree v
= native_interpret_expr (type
, b
,
12543 bitsize
/ BITS_PER_UNIT
);
12552 case VEC_PERM_EXPR
:
12553 /* Perform constant folding of BIT_INSERT_EXPR. */
12554 if (TREE_CODE (arg2
) == VECTOR_CST
12555 && TREE_CODE (op0
) == VECTOR_CST
12556 && TREE_CODE (op1
) == VECTOR_CST
)
12558 /* Build a vector of integers from the tree mask. */
12559 vec_perm_builder builder
;
12560 if (!tree_to_vec_perm_builder (&builder
, arg2
))
12563 /* Create a vec_perm_indices for the integer vector. */
12564 poly_uint64 nelts
= TYPE_VECTOR_SUBPARTS (type
);
12565 bool single_arg
= (op0
== op1
);
12566 vec_perm_indices
sel (builder
, single_arg
? 1 : 2, nelts
);
12567 return fold_vec_perm (type
, op0
, op1
, sel
);
12571 case BIT_INSERT_EXPR
:
12572 /* Perform (partial) constant folding of BIT_INSERT_EXPR. */
12573 if (TREE_CODE (arg0
) == INTEGER_CST
12574 && TREE_CODE (arg1
) == INTEGER_CST
)
12576 unsigned HOST_WIDE_INT bitpos
= tree_to_uhwi (op2
);
12577 unsigned bitsize
= TYPE_PRECISION (TREE_TYPE (arg1
));
12578 wide_int tem
= (wi::to_wide (arg0
)
12579 & wi::shifted_mask (bitpos
, bitsize
, true,
12580 TYPE_PRECISION (type
)));
12582 = wi::lshift (wi::zext (wi::to_wide (arg1
, TYPE_PRECISION (type
)),
12584 return wide_int_to_tree (type
, wi::bit_or (tem
, tem2
));
12586 else if (TREE_CODE (arg0
) == VECTOR_CST
12587 && CONSTANT_CLASS_P (arg1
)
12588 && types_compatible_p (TREE_TYPE (TREE_TYPE (arg0
)),
12591 unsigned HOST_WIDE_INT bitpos
= tree_to_uhwi (op2
);
12592 unsigned HOST_WIDE_INT elsize
12593 = tree_to_uhwi (TYPE_SIZE (TREE_TYPE (arg1
)));
12594 if (bitpos
% elsize
== 0)
12596 unsigned k
= bitpos
/ elsize
;
12597 unsigned HOST_WIDE_INT nelts
;
12598 if (operand_equal_p (VECTOR_CST_ELT (arg0
, k
), arg1
, 0))
12600 else if (VECTOR_CST_NELTS (arg0
).is_constant (&nelts
))
12602 tree_vector_builder
elts (type
, nelts
, 1);
12603 elts
.quick_grow (nelts
);
12604 for (unsigned HOST_WIDE_INT i
= 0; i
< nelts
; ++i
)
12605 elts
[i
] = (i
== k
? arg1
: VECTOR_CST_ELT (arg0
, i
));
12606 return elts
.build ();
12614 } /* switch (code) */
12617 /* Gets the element ACCESS_INDEX from CTOR, which must be a CONSTRUCTOR
12618 of an array (or vector). *CTOR_IDX if non-NULL is updated with the
12619 constructor element index of the value returned. If the element is
12620 not found NULL_TREE is returned and *CTOR_IDX is updated to
12621 the index of the element after the ACCESS_INDEX position (which
12622 may be outside of the CTOR array). */
12625 get_array_ctor_element_at_index (tree ctor
, offset_int access_index
,
12626 unsigned *ctor_idx
)
12628 tree index_type
= NULL_TREE
;
12629 signop index_sgn
= UNSIGNED
;
12630 offset_int low_bound
= 0;
12632 if (TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
)
12634 tree domain_type
= TYPE_DOMAIN (TREE_TYPE (ctor
));
12635 if (domain_type
&& TYPE_MIN_VALUE (domain_type
))
12637 /* Static constructors for variably sized objects makes no sense. */
12638 gcc_assert (TREE_CODE (TYPE_MIN_VALUE (domain_type
)) == INTEGER_CST
);
12639 index_type
= TREE_TYPE (TYPE_MIN_VALUE (domain_type
));
12640 /* ??? When it is obvious that the range is signed, treat it so. */
12641 if (TYPE_UNSIGNED (index_type
)
12642 && TYPE_MAX_VALUE (domain_type
)
12643 && tree_int_cst_lt (TYPE_MAX_VALUE (domain_type
),
12644 TYPE_MIN_VALUE (domain_type
)))
12646 index_sgn
= SIGNED
;
12648 = offset_int::from (wi::to_wide (TYPE_MIN_VALUE (domain_type
)),
12653 index_sgn
= TYPE_SIGN (index_type
);
12654 low_bound
= wi::to_offset (TYPE_MIN_VALUE (domain_type
));
12660 access_index
= wi::ext (access_index
, TYPE_PRECISION (index_type
),
12663 offset_int index
= low_bound
;
12665 index
= wi::ext (index
, TYPE_PRECISION (index_type
), index_sgn
);
12667 offset_int max_index
= index
;
12670 bool first_p
= true;
12672 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (ctor
), cnt
, cfield
, cval
)
12674 /* Array constructor might explicitly set index, or specify a range,
12675 or leave index NULL meaning that it is next index after previous
12679 if (TREE_CODE (cfield
) == INTEGER_CST
)
12681 = offset_int::from (wi::to_wide (cfield
), index_sgn
);
12684 gcc_assert (TREE_CODE (cfield
) == RANGE_EXPR
);
12685 index
= offset_int::from (wi::to_wide (TREE_OPERAND (cfield
, 0)),
12688 = offset_int::from (wi::to_wide (TREE_OPERAND (cfield
, 1)),
12690 gcc_checking_assert (wi::le_p (index
, max_index
, index_sgn
));
12695 index
= max_index
+ 1;
12697 index
= wi::ext (index
, TYPE_PRECISION (index_type
), index_sgn
);
12698 gcc_checking_assert (wi::gt_p (index
, max_index
, index_sgn
));
12704 /* Do we have match? */
12705 if (wi::cmp (access_index
, index
, index_sgn
) >= 0)
12707 if (wi::cmp (access_index
, max_index
, index_sgn
) <= 0)
12714 else if (in_gimple_form
)
12715 /* We're past the element we search for. Note during parsing
12716 the elements might not be sorted.
12717 ??? We should use a binary search and a flag on the
12718 CONSTRUCTOR as to whether elements are sorted in declaration
12727 /* Perform constant folding and related simplification of EXPR.
12728 The related simplifications include x*1 => x, x*0 => 0, etc.,
12729 and application of the associative law.
12730 NOP_EXPR conversions may be removed freely (as long as we
12731 are careful not to change the type of the overall expression).
12732 We cannot simplify through a CONVERT_EXPR, FIX_EXPR or FLOAT_EXPR,
12733 but we can constant-fold them if they have constant operands. */
12735 #ifdef ENABLE_FOLD_CHECKING
12736 # define fold(x) fold_1 (x)
12737 static tree
fold_1 (tree
);
12743 const tree t
= expr
;
12744 enum tree_code code
= TREE_CODE (t
);
12745 enum tree_code_class kind
= TREE_CODE_CLASS (code
);
12747 location_t loc
= EXPR_LOCATION (expr
);
12749 /* Return right away if a constant. */
12750 if (kind
== tcc_constant
)
12753 /* CALL_EXPR-like objects with variable numbers of operands are
12754 treated specially. */
12755 if (kind
== tcc_vl_exp
)
12757 if (code
== CALL_EXPR
)
12759 tem
= fold_call_expr (loc
, expr
, false);
12760 return tem
? tem
: expr
;
12765 if (IS_EXPR_CODE_CLASS (kind
))
12767 tree type
= TREE_TYPE (t
);
12768 tree op0
, op1
, op2
;
12770 switch (TREE_CODE_LENGTH (code
))
12773 op0
= TREE_OPERAND (t
, 0);
12774 tem
= fold_unary_loc (loc
, code
, type
, op0
);
12775 return tem
? tem
: expr
;
12777 op0
= TREE_OPERAND (t
, 0);
12778 op1
= TREE_OPERAND (t
, 1);
12779 tem
= fold_binary_loc (loc
, code
, type
, op0
, op1
);
12780 return tem
? tem
: expr
;
12782 op0
= TREE_OPERAND (t
, 0);
12783 op1
= TREE_OPERAND (t
, 1);
12784 op2
= TREE_OPERAND (t
, 2);
12785 tem
= fold_ternary_loc (loc
, code
, type
, op0
, op1
, op2
);
12786 return tem
? tem
: expr
;
12796 tree op0
= TREE_OPERAND (t
, 0);
12797 tree op1
= TREE_OPERAND (t
, 1);
12799 if (TREE_CODE (op1
) == INTEGER_CST
12800 && TREE_CODE (op0
) == CONSTRUCTOR
12801 && ! type_contains_placeholder_p (TREE_TYPE (op0
)))
12803 tree val
= get_array_ctor_element_at_index (op0
,
12804 wi::to_offset (op1
));
12812 /* Return a VECTOR_CST if possible. */
12815 tree type
= TREE_TYPE (t
);
12816 if (TREE_CODE (type
) != VECTOR_TYPE
)
12821 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (t
), i
, val
)
12822 if (! CONSTANT_CLASS_P (val
))
12825 return build_vector_from_ctor (type
, CONSTRUCTOR_ELTS (t
));
12829 return fold (DECL_INITIAL (t
));
12833 } /* switch (code) */
12836 #ifdef ENABLE_FOLD_CHECKING
12839 static void fold_checksum_tree (const_tree
, struct md5_ctx
*,
12840 hash_table
<nofree_ptr_hash
<const tree_node
> > *);
12841 static void fold_check_failed (const_tree
, const_tree
);
12842 void print_fold_checksum (const_tree
);
12844 /* When --enable-checking=fold, compute a digest of expr before
12845 and after actual fold call to see if fold did not accidentally
12846 change original expr. */
12852 struct md5_ctx ctx
;
12853 unsigned char checksum_before
[16], checksum_after
[16];
12854 hash_table
<nofree_ptr_hash
<const tree_node
> > ht (32);
12856 md5_init_ctx (&ctx
);
12857 fold_checksum_tree (expr
, &ctx
, &ht
);
12858 md5_finish_ctx (&ctx
, checksum_before
);
12861 ret
= fold_1 (expr
);
12863 md5_init_ctx (&ctx
);
12864 fold_checksum_tree (expr
, &ctx
, &ht
);
12865 md5_finish_ctx (&ctx
, checksum_after
);
12867 if (memcmp (checksum_before
, checksum_after
, 16))
12868 fold_check_failed (expr
, ret
);
12874 print_fold_checksum (const_tree expr
)
12876 struct md5_ctx ctx
;
12877 unsigned char checksum
[16], cnt
;
12878 hash_table
<nofree_ptr_hash
<const tree_node
> > ht (32);
12880 md5_init_ctx (&ctx
);
12881 fold_checksum_tree (expr
, &ctx
, &ht
);
12882 md5_finish_ctx (&ctx
, checksum
);
12883 for (cnt
= 0; cnt
< 16; ++cnt
)
12884 fprintf (stderr
, "%02x", checksum
[cnt
]);
12885 putc ('\n', stderr
);
12889 fold_check_failed (const_tree expr ATTRIBUTE_UNUSED
, const_tree ret ATTRIBUTE_UNUSED
)
12891 internal_error ("fold check: original tree changed by fold");
12895 fold_checksum_tree (const_tree expr
, struct md5_ctx
*ctx
,
12896 hash_table
<nofree_ptr_hash
<const tree_node
> > *ht
)
12898 const tree_node
**slot
;
12899 enum tree_code code
;
12900 union tree_node
*buf
;
12906 slot
= ht
->find_slot (expr
, INSERT
);
12910 code
= TREE_CODE (expr
);
12911 if (TREE_CODE_CLASS (code
) == tcc_declaration
12912 && HAS_DECL_ASSEMBLER_NAME_P (expr
))
12914 /* Allow DECL_ASSEMBLER_NAME and symtab_node to be modified. */
12915 size_t sz
= tree_size (expr
);
12916 buf
= XALLOCAVAR (union tree_node
, sz
);
12917 memcpy ((char *) buf
, expr
, sz
);
12918 SET_DECL_ASSEMBLER_NAME ((tree
) buf
, NULL
);
12919 buf
->decl_with_vis
.symtab_node
= NULL
;
12920 buf
->base
.nowarning_flag
= 0;
12923 else if (TREE_CODE_CLASS (code
) == tcc_type
12924 && (TYPE_POINTER_TO (expr
)
12925 || TYPE_REFERENCE_TO (expr
)
12926 || TYPE_CACHED_VALUES_P (expr
)
12927 || TYPE_CONTAINS_PLACEHOLDER_INTERNAL (expr
)
12928 || TYPE_NEXT_VARIANT (expr
)
12929 || TYPE_ALIAS_SET_KNOWN_P (expr
)))
12931 /* Allow these fields to be modified. */
12933 size_t sz
= tree_size (expr
);
12934 buf
= XALLOCAVAR (union tree_node
, sz
);
12935 memcpy ((char *) buf
, expr
, sz
);
12936 expr
= tmp
= (tree
) buf
;
12937 TYPE_CONTAINS_PLACEHOLDER_INTERNAL (tmp
) = 0;
12938 TYPE_POINTER_TO (tmp
) = NULL
;
12939 TYPE_REFERENCE_TO (tmp
) = NULL
;
12940 TYPE_NEXT_VARIANT (tmp
) = NULL
;
12941 TYPE_ALIAS_SET (tmp
) = -1;
12942 if (TYPE_CACHED_VALUES_P (tmp
))
12944 TYPE_CACHED_VALUES_P (tmp
) = 0;
12945 TYPE_CACHED_VALUES (tmp
) = NULL
;
12948 else if (TREE_NO_WARNING (expr
) && (DECL_P (expr
) || EXPR_P (expr
)))
12950 /* Allow TREE_NO_WARNING to be set. Perhaps we shouldn't allow that
12951 and change builtins.c etc. instead - see PR89543. */
12952 size_t sz
= tree_size (expr
);
12953 buf
= XALLOCAVAR (union tree_node
, sz
);
12954 memcpy ((char *) buf
, expr
, sz
);
12955 buf
->base
.nowarning_flag
= 0;
12958 md5_process_bytes (expr
, tree_size (expr
), ctx
);
12959 if (CODE_CONTAINS_STRUCT (code
, TS_TYPED
))
12960 fold_checksum_tree (TREE_TYPE (expr
), ctx
, ht
);
12961 if (TREE_CODE_CLASS (code
) != tcc_type
12962 && TREE_CODE_CLASS (code
) != tcc_declaration
12963 && code
!= TREE_LIST
12964 && code
!= SSA_NAME
12965 && CODE_CONTAINS_STRUCT (code
, TS_COMMON
))
12966 fold_checksum_tree (TREE_CHAIN (expr
), ctx
, ht
);
12967 switch (TREE_CODE_CLASS (code
))
12973 md5_process_bytes (TREE_STRING_POINTER (expr
),
12974 TREE_STRING_LENGTH (expr
), ctx
);
12977 fold_checksum_tree (TREE_REALPART (expr
), ctx
, ht
);
12978 fold_checksum_tree (TREE_IMAGPART (expr
), ctx
, ht
);
12981 len
= vector_cst_encoded_nelts (expr
);
12982 for (i
= 0; i
< len
; ++i
)
12983 fold_checksum_tree (VECTOR_CST_ENCODED_ELT (expr
, i
), ctx
, ht
);
12989 case tcc_exceptional
:
12993 fold_checksum_tree (TREE_PURPOSE (expr
), ctx
, ht
);
12994 fold_checksum_tree (TREE_VALUE (expr
), ctx
, ht
);
12995 expr
= TREE_CHAIN (expr
);
12996 goto recursive_label
;
12999 for (i
= 0; i
< TREE_VEC_LENGTH (expr
); ++i
)
13000 fold_checksum_tree (TREE_VEC_ELT (expr
, i
), ctx
, ht
);
13006 case tcc_expression
:
13007 case tcc_reference
:
13008 case tcc_comparison
:
13011 case tcc_statement
:
13013 len
= TREE_OPERAND_LENGTH (expr
);
13014 for (i
= 0; i
< len
; ++i
)
13015 fold_checksum_tree (TREE_OPERAND (expr
, i
), ctx
, ht
);
13017 case tcc_declaration
:
13018 fold_checksum_tree (DECL_NAME (expr
), ctx
, ht
);
13019 fold_checksum_tree (DECL_CONTEXT (expr
), ctx
, ht
);
13020 if (CODE_CONTAINS_STRUCT (TREE_CODE (expr
), TS_DECL_COMMON
))
13022 fold_checksum_tree (DECL_SIZE (expr
), ctx
, ht
);
13023 fold_checksum_tree (DECL_SIZE_UNIT (expr
), ctx
, ht
);
13024 fold_checksum_tree (DECL_INITIAL (expr
), ctx
, ht
);
13025 fold_checksum_tree (DECL_ABSTRACT_ORIGIN (expr
), ctx
, ht
);
13026 fold_checksum_tree (DECL_ATTRIBUTES (expr
), ctx
, ht
);
13029 if (CODE_CONTAINS_STRUCT (TREE_CODE (expr
), TS_DECL_NON_COMMON
))
13031 if (TREE_CODE (expr
) == FUNCTION_DECL
)
13033 fold_checksum_tree (DECL_VINDEX (expr
), ctx
, ht
);
13034 fold_checksum_tree (DECL_ARGUMENTS (expr
), ctx
, ht
);
13036 fold_checksum_tree (DECL_RESULT_FLD (expr
), ctx
, ht
);
13040 if (TREE_CODE (expr
) == ENUMERAL_TYPE
)
13041 fold_checksum_tree (TYPE_VALUES (expr
), ctx
, ht
);
13042 fold_checksum_tree (TYPE_SIZE (expr
), ctx
, ht
);
13043 fold_checksum_tree (TYPE_SIZE_UNIT (expr
), ctx
, ht
);
13044 fold_checksum_tree (TYPE_ATTRIBUTES (expr
), ctx
, ht
);
13045 fold_checksum_tree (TYPE_NAME (expr
), ctx
, ht
);
13046 if (INTEGRAL_TYPE_P (expr
)
13047 || SCALAR_FLOAT_TYPE_P (expr
))
13049 fold_checksum_tree (TYPE_MIN_VALUE (expr
), ctx
, ht
);
13050 fold_checksum_tree (TYPE_MAX_VALUE (expr
), ctx
, ht
);
13052 fold_checksum_tree (TYPE_MAIN_VARIANT (expr
), ctx
, ht
);
13053 if (TREE_CODE (expr
) == RECORD_TYPE
13054 || TREE_CODE (expr
) == UNION_TYPE
13055 || TREE_CODE (expr
) == QUAL_UNION_TYPE
)
13056 fold_checksum_tree (TYPE_BINFO (expr
), ctx
, ht
);
13057 fold_checksum_tree (TYPE_CONTEXT (expr
), ctx
, ht
);
13064 /* Helper function for outputting the checksum of a tree T. When
13065 debugging with gdb, you can "define mynext" to be "next" followed
13066 by "call debug_fold_checksum (op0)", then just trace down till the
13069 DEBUG_FUNCTION
void
13070 debug_fold_checksum (const_tree t
)
13073 unsigned char checksum
[16];
13074 struct md5_ctx ctx
;
13075 hash_table
<nofree_ptr_hash
<const tree_node
> > ht (32);
13077 md5_init_ctx (&ctx
);
13078 fold_checksum_tree (t
, &ctx
, &ht
);
13079 md5_finish_ctx (&ctx
, checksum
);
13082 for (i
= 0; i
< 16; i
++)
13083 fprintf (stderr
, "%d ", checksum
[i
]);
13085 fprintf (stderr
, "\n");
13090 /* Fold a unary tree expression with code CODE of type TYPE with an
13091 operand OP0. LOC is the location of the resulting expression.
13092 Return a folded expression if successful. Otherwise, return a tree
13093 expression with code CODE of type TYPE with an operand OP0. */
13096 fold_build1_loc (location_t loc
,
13097 enum tree_code code
, tree type
, tree op0 MEM_STAT_DECL
)
13100 #ifdef ENABLE_FOLD_CHECKING
13101 unsigned char checksum_before
[16], checksum_after
[16];
13102 struct md5_ctx ctx
;
13103 hash_table
<nofree_ptr_hash
<const tree_node
> > ht (32);
13105 md5_init_ctx (&ctx
);
13106 fold_checksum_tree (op0
, &ctx
, &ht
);
13107 md5_finish_ctx (&ctx
, checksum_before
);
13111 tem
= fold_unary_loc (loc
, code
, type
, op0
);
13113 tem
= build1_loc (loc
, code
, type
, op0 PASS_MEM_STAT
);
13115 #ifdef ENABLE_FOLD_CHECKING
13116 md5_init_ctx (&ctx
);
13117 fold_checksum_tree (op0
, &ctx
, &ht
);
13118 md5_finish_ctx (&ctx
, checksum_after
);
13120 if (memcmp (checksum_before
, checksum_after
, 16))
13121 fold_check_failed (op0
, tem
);
13126 /* Fold a binary tree expression with code CODE of type TYPE with
13127 operands OP0 and OP1. LOC is the location of the resulting
13128 expression. Return a folded expression if successful. Otherwise,
13129 return a tree expression with code CODE of type TYPE with operands
13133 fold_build2_loc (location_t loc
,
13134 enum tree_code code
, tree type
, tree op0
, tree op1
13138 #ifdef ENABLE_FOLD_CHECKING
13139 unsigned char checksum_before_op0
[16],
13140 checksum_before_op1
[16],
13141 checksum_after_op0
[16],
13142 checksum_after_op1
[16];
13143 struct md5_ctx ctx
;
13144 hash_table
<nofree_ptr_hash
<const tree_node
> > ht (32);
13146 md5_init_ctx (&ctx
);
13147 fold_checksum_tree (op0
, &ctx
, &ht
);
13148 md5_finish_ctx (&ctx
, checksum_before_op0
);
13151 md5_init_ctx (&ctx
);
13152 fold_checksum_tree (op1
, &ctx
, &ht
);
13153 md5_finish_ctx (&ctx
, checksum_before_op1
);
13157 tem
= fold_binary_loc (loc
, code
, type
, op0
, op1
);
13159 tem
= build2_loc (loc
, code
, type
, op0
, op1 PASS_MEM_STAT
);
13161 #ifdef ENABLE_FOLD_CHECKING
13162 md5_init_ctx (&ctx
);
13163 fold_checksum_tree (op0
, &ctx
, &ht
);
13164 md5_finish_ctx (&ctx
, checksum_after_op0
);
13167 if (memcmp (checksum_before_op0
, checksum_after_op0
, 16))
13168 fold_check_failed (op0
, tem
);
13170 md5_init_ctx (&ctx
);
13171 fold_checksum_tree (op1
, &ctx
, &ht
);
13172 md5_finish_ctx (&ctx
, checksum_after_op1
);
13174 if (memcmp (checksum_before_op1
, checksum_after_op1
, 16))
13175 fold_check_failed (op1
, tem
);
13180 /* Fold a ternary tree expression with code CODE of type TYPE with
13181 operands OP0, OP1, and OP2. Return a folded expression if
13182 successful. Otherwise, return a tree expression with code CODE of
13183 type TYPE with operands OP0, OP1, and OP2. */
13186 fold_build3_loc (location_t loc
, enum tree_code code
, tree type
,
13187 tree op0
, tree op1
, tree op2 MEM_STAT_DECL
)
13190 #ifdef ENABLE_FOLD_CHECKING
13191 unsigned char checksum_before_op0
[16],
13192 checksum_before_op1
[16],
13193 checksum_before_op2
[16],
13194 checksum_after_op0
[16],
13195 checksum_after_op1
[16],
13196 checksum_after_op2
[16];
13197 struct md5_ctx ctx
;
13198 hash_table
<nofree_ptr_hash
<const tree_node
> > ht (32);
13200 md5_init_ctx (&ctx
);
13201 fold_checksum_tree (op0
, &ctx
, &ht
);
13202 md5_finish_ctx (&ctx
, checksum_before_op0
);
13205 md5_init_ctx (&ctx
);
13206 fold_checksum_tree (op1
, &ctx
, &ht
);
13207 md5_finish_ctx (&ctx
, checksum_before_op1
);
13210 md5_init_ctx (&ctx
);
13211 fold_checksum_tree (op2
, &ctx
, &ht
);
13212 md5_finish_ctx (&ctx
, checksum_before_op2
);
13216 gcc_assert (TREE_CODE_CLASS (code
) != tcc_vl_exp
);
13217 tem
= fold_ternary_loc (loc
, code
, type
, op0
, op1
, op2
);
13219 tem
= build3_loc (loc
, code
, type
, op0
, op1
, op2 PASS_MEM_STAT
);
13221 #ifdef ENABLE_FOLD_CHECKING
13222 md5_init_ctx (&ctx
);
13223 fold_checksum_tree (op0
, &ctx
, &ht
);
13224 md5_finish_ctx (&ctx
, checksum_after_op0
);
13227 if (memcmp (checksum_before_op0
, checksum_after_op0
, 16))
13228 fold_check_failed (op0
, tem
);
13230 md5_init_ctx (&ctx
);
13231 fold_checksum_tree (op1
, &ctx
, &ht
);
13232 md5_finish_ctx (&ctx
, checksum_after_op1
);
13235 if (memcmp (checksum_before_op1
, checksum_after_op1
, 16))
13236 fold_check_failed (op1
, tem
);
13238 md5_init_ctx (&ctx
);
13239 fold_checksum_tree (op2
, &ctx
, &ht
);
13240 md5_finish_ctx (&ctx
, checksum_after_op2
);
13242 if (memcmp (checksum_before_op2
, checksum_after_op2
, 16))
13243 fold_check_failed (op2
, tem
);
13248 /* Fold a CALL_EXPR expression of type TYPE with operands FN and NARGS
13249 arguments in ARGARRAY, and a null static chain.
13250 Return a folded expression if successful. Otherwise, return a CALL_EXPR
13251 of type TYPE from the given operands as constructed by build_call_array. */
13254 fold_build_call_array_loc (location_t loc
, tree type
, tree fn
,
13255 int nargs
, tree
*argarray
)
13258 #ifdef ENABLE_FOLD_CHECKING
13259 unsigned char checksum_before_fn
[16],
13260 checksum_before_arglist
[16],
13261 checksum_after_fn
[16],
13262 checksum_after_arglist
[16];
13263 struct md5_ctx ctx
;
13264 hash_table
<nofree_ptr_hash
<const tree_node
> > ht (32);
13267 md5_init_ctx (&ctx
);
13268 fold_checksum_tree (fn
, &ctx
, &ht
);
13269 md5_finish_ctx (&ctx
, checksum_before_fn
);
13272 md5_init_ctx (&ctx
);
13273 for (i
= 0; i
< nargs
; i
++)
13274 fold_checksum_tree (argarray
[i
], &ctx
, &ht
);
13275 md5_finish_ctx (&ctx
, checksum_before_arglist
);
13279 tem
= fold_builtin_call_array (loc
, type
, fn
, nargs
, argarray
);
13281 tem
= build_call_array_loc (loc
, type
, fn
, nargs
, argarray
);
13283 #ifdef ENABLE_FOLD_CHECKING
13284 md5_init_ctx (&ctx
);
13285 fold_checksum_tree (fn
, &ctx
, &ht
);
13286 md5_finish_ctx (&ctx
, checksum_after_fn
);
13289 if (memcmp (checksum_before_fn
, checksum_after_fn
, 16))
13290 fold_check_failed (fn
, tem
);
13292 md5_init_ctx (&ctx
);
13293 for (i
= 0; i
< nargs
; i
++)
13294 fold_checksum_tree (argarray
[i
], &ctx
, &ht
);
13295 md5_finish_ctx (&ctx
, checksum_after_arglist
);
13297 if (memcmp (checksum_before_arglist
, checksum_after_arglist
, 16))
13298 fold_check_failed (NULL_TREE
, tem
);
13303 /* Perform constant folding and related simplification of initializer
13304 expression EXPR. These behave identically to "fold_buildN" but ignore
13305 potential run-time traps and exceptions that fold must preserve. */
13307 #define START_FOLD_INIT \
13308 int saved_signaling_nans = flag_signaling_nans;\
13309 int saved_trapping_math = flag_trapping_math;\
13310 int saved_rounding_math = flag_rounding_math;\
13311 int saved_trapv = flag_trapv;\
13312 int saved_folding_initializer = folding_initializer;\
13313 flag_signaling_nans = 0;\
13314 flag_trapping_math = 0;\
13315 flag_rounding_math = 0;\
13317 folding_initializer = 1;
13319 #define END_FOLD_INIT \
13320 flag_signaling_nans = saved_signaling_nans;\
13321 flag_trapping_math = saved_trapping_math;\
13322 flag_rounding_math = saved_rounding_math;\
13323 flag_trapv = saved_trapv;\
13324 folding_initializer = saved_folding_initializer;
13327 fold_build1_initializer_loc (location_t loc
, enum tree_code code
,
13328 tree type
, tree op
)
13333 result
= fold_build1_loc (loc
, code
, type
, op
);
13340 fold_build2_initializer_loc (location_t loc
, enum tree_code code
,
13341 tree type
, tree op0
, tree op1
)
13346 result
= fold_build2_loc (loc
, code
, type
, op0
, op1
);
13353 fold_build_call_array_initializer_loc (location_t loc
, tree type
, tree fn
,
13354 int nargs
, tree
*argarray
)
13359 result
= fold_build_call_array_loc (loc
, type
, fn
, nargs
, argarray
);
13365 #undef START_FOLD_INIT
13366 #undef END_FOLD_INIT
13368 /* Determine if first argument is a multiple of second argument. Return 0 if
13369 it is not, or we cannot easily determined it to be.
13371 An example of the sort of thing we care about (at this point; this routine
13372 could surely be made more general, and expanded to do what the *_DIV_EXPR's
13373 fold cases do now) is discovering that
13375 SAVE_EXPR (I) * SAVE_EXPR (J * 8)
13381 when we know that the two SAVE_EXPR (J * 8) nodes are the same node.
13383 This code also handles discovering that
13385 SAVE_EXPR (I) * SAVE_EXPR (J * 8)
13387 is a multiple of 8 so we don't have to worry about dealing with a
13388 possible remainder.
13390 Note that we *look* inside a SAVE_EXPR only to determine how it was
13391 calculated; it is not safe for fold to do much of anything else with the
13392 internals of a SAVE_EXPR, since it cannot know when it will be evaluated
13393 at run time. For example, the latter example above *cannot* be implemented
13394 as SAVE_EXPR (I) * J or any variant thereof, since the value of J at
13395 evaluation time of the original SAVE_EXPR is not necessarily the same at
13396 the time the new expression is evaluated. The only optimization of this
13397 sort that would be valid is changing
13399 SAVE_EXPR (I) * SAVE_EXPR (SAVE_EXPR (J) * 8)
13403 SAVE_EXPR (I) * SAVE_EXPR (J)
13405 (where the same SAVE_EXPR (J) is used in the original and the
13406 transformed version). */
13409 multiple_of_p (tree type
, const_tree top
, const_tree bottom
)
13414 if (operand_equal_p (top
, bottom
, 0))
13417 if (TREE_CODE (type
) != INTEGER_TYPE
)
13420 switch (TREE_CODE (top
))
13423 /* Bitwise and provides a power of two multiple. If the mask is
13424 a multiple of BOTTOM then TOP is a multiple of BOTTOM. */
13425 if (!integer_pow2p (bottom
))
13427 return (multiple_of_p (type
, TREE_OPERAND (top
, 1), bottom
)
13428 || multiple_of_p (type
, TREE_OPERAND (top
, 0), bottom
));
13431 if (TREE_CODE (bottom
) == INTEGER_CST
)
13433 op1
= TREE_OPERAND (top
, 0);
13434 op2
= TREE_OPERAND (top
, 1);
13435 if (TREE_CODE (op1
) == INTEGER_CST
)
13436 std::swap (op1
, op2
);
13437 if (TREE_CODE (op2
) == INTEGER_CST
)
13439 if (multiple_of_p (type
, op2
, bottom
))
13441 /* Handle multiple_of_p ((x * 2 + 2) * 4, 8). */
13442 if (multiple_of_p (type
, bottom
, op2
))
13444 widest_int w
= wi::sdiv_trunc (wi::to_widest (bottom
),
13445 wi::to_widest (op2
));
13446 if (wi::fits_to_tree_p (w
, TREE_TYPE (bottom
)))
13448 op2
= wide_int_to_tree (TREE_TYPE (bottom
), w
);
13449 return multiple_of_p (type
, op1
, op2
);
13452 return multiple_of_p (type
, op1
, bottom
);
13455 return (multiple_of_p (type
, TREE_OPERAND (top
, 1), bottom
)
13456 || multiple_of_p (type
, TREE_OPERAND (top
, 0), bottom
));
13459 /* It is impossible to prove if op0 - op1 is multiple of bottom
13460 precisely, so be conservative here checking if both op0 and op1
13461 are multiple of bottom. Note we check the second operand first
13462 since it's usually simpler. */
13463 return (multiple_of_p (type
, TREE_OPERAND (top
, 1), bottom
)
13464 && multiple_of_p (type
, TREE_OPERAND (top
, 0), bottom
));
13467 /* The same as MINUS_EXPR, but handle cases like op0 + 0xfffffffd
13468 as op0 - 3 if the expression has unsigned type. For example,
13469 (X / 3) + 0xfffffffd is multiple of 3, but 0xfffffffd is not. */
13470 op1
= TREE_OPERAND (top
, 1);
13471 if (TYPE_UNSIGNED (type
)
13472 && TREE_CODE (op1
) == INTEGER_CST
&& tree_int_cst_sign_bit (op1
))
13473 op1
= fold_build1 (NEGATE_EXPR
, type
, op1
);
13474 return (multiple_of_p (type
, op1
, bottom
)
13475 && multiple_of_p (type
, TREE_OPERAND (top
, 0), bottom
));
13478 if (TREE_CODE (TREE_OPERAND (top
, 1)) == INTEGER_CST
)
13480 op1
= TREE_OPERAND (top
, 1);
13481 /* const_binop may not detect overflow correctly,
13482 so check for it explicitly here. */
13483 if (wi::gtu_p (TYPE_PRECISION (TREE_TYPE (size_one_node
)),
13485 && (t1
= fold_convert (type
,
13486 const_binop (LSHIFT_EXPR
, size_one_node
,
13488 && !TREE_OVERFLOW (t1
))
13489 return multiple_of_p (type
, t1
, bottom
);
13494 /* Can't handle conversions from non-integral or wider integral type. */
13495 if ((TREE_CODE (TREE_TYPE (TREE_OPERAND (top
, 0))) != INTEGER_TYPE
)
13496 || (TYPE_PRECISION (type
)
13497 < TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (top
, 0)))))
13503 return multiple_of_p (type
, TREE_OPERAND (top
, 0), bottom
);
13506 return (multiple_of_p (type
, TREE_OPERAND (top
, 1), bottom
)
13507 && multiple_of_p (type
, TREE_OPERAND (top
, 2), bottom
));
13510 if (TREE_CODE (bottom
) != INTEGER_CST
13511 || integer_zerop (bottom
)
13512 || (TYPE_UNSIGNED (type
)
13513 && (tree_int_cst_sgn (top
) < 0
13514 || tree_int_cst_sgn (bottom
) < 0)))
13516 return wi::multiple_of_p (wi::to_widest (top
), wi::to_widest (bottom
),
13520 if (TREE_CODE (bottom
) == INTEGER_CST
13521 && (stmt
= SSA_NAME_DEF_STMT (top
)) != NULL
13522 && gimple_code (stmt
) == GIMPLE_ASSIGN
)
13524 enum tree_code code
= gimple_assign_rhs_code (stmt
);
13526 /* Check for special cases to see if top is defined as multiple
13529 top = (X & ~(bottom - 1) ; bottom is power of 2
13535 if (code
== BIT_AND_EXPR
13536 && (op2
= gimple_assign_rhs2 (stmt
)) != NULL_TREE
13537 && TREE_CODE (op2
) == INTEGER_CST
13538 && integer_pow2p (bottom
)
13539 && wi::multiple_of_p (wi::to_widest (op2
),
13540 wi::to_widest (bottom
), UNSIGNED
))
13543 op1
= gimple_assign_rhs1 (stmt
);
13544 if (code
== MINUS_EXPR
13545 && (op2
= gimple_assign_rhs2 (stmt
)) != NULL_TREE
13546 && TREE_CODE (op2
) == SSA_NAME
13547 && (stmt
= SSA_NAME_DEF_STMT (op2
)) != NULL
13548 && gimple_code (stmt
) == GIMPLE_ASSIGN
13549 && (code
= gimple_assign_rhs_code (stmt
)) == TRUNC_MOD_EXPR
13550 && operand_equal_p (op1
, gimple_assign_rhs1 (stmt
), 0)
13551 && operand_equal_p (bottom
, gimple_assign_rhs2 (stmt
), 0))
13558 if (POLY_INT_CST_P (top
) && poly_int_tree_p (bottom
))
13559 return multiple_p (wi::to_poly_widest (top
),
13560 wi::to_poly_widest (bottom
));
13566 #define tree_expr_nonnegative_warnv_p(X, Y) \
13567 _Pragma ("GCC error \"Use RECURSE for recursive calls\"") 0
13569 #define RECURSE(X) \
13570 ((tree_expr_nonnegative_warnv_p) (X, strict_overflow_p, depth + 1))
13572 /* Return true if CODE or TYPE is known to be non-negative. */
13575 tree_simple_nonnegative_warnv_p (enum tree_code code
, tree type
)
13577 if ((TYPE_PRECISION (type
) != 1 || TYPE_UNSIGNED (type
))
13578 && truth_value_p (code
))
13579 /* Truth values evaluate to 0 or 1, which is nonnegative unless we
13580 have a signed:1 type (where the value is -1 and 0). */
13585 /* Return true if (CODE OP0) is known to be non-negative. If the return
13586 value is based on the assumption that signed overflow is undefined,
13587 set *STRICT_OVERFLOW_P to true; otherwise, don't change
13588 *STRICT_OVERFLOW_P. DEPTH is the current nesting depth of the query. */
13591 tree_unary_nonnegative_warnv_p (enum tree_code code
, tree type
, tree op0
,
13592 bool *strict_overflow_p
, int depth
)
13594 if (TYPE_UNSIGNED (type
))
13600 /* We can't return 1 if flag_wrapv is set because
13601 ABS_EXPR<INT_MIN> = INT_MIN. */
13602 if (!ANY_INTEGRAL_TYPE_P (type
))
13604 if (TYPE_OVERFLOW_UNDEFINED (type
))
13606 *strict_overflow_p
= true;
13611 case NON_LVALUE_EXPR
:
13613 case FIX_TRUNC_EXPR
:
13614 return RECURSE (op0
);
13618 tree inner_type
= TREE_TYPE (op0
);
13619 tree outer_type
= type
;
13621 if (TREE_CODE (outer_type
) == REAL_TYPE
)
13623 if (TREE_CODE (inner_type
) == REAL_TYPE
)
13624 return RECURSE (op0
);
13625 if (INTEGRAL_TYPE_P (inner_type
))
13627 if (TYPE_UNSIGNED (inner_type
))
13629 return RECURSE (op0
);
13632 else if (INTEGRAL_TYPE_P (outer_type
))
13634 if (TREE_CODE (inner_type
) == REAL_TYPE
)
13635 return RECURSE (op0
);
13636 if (INTEGRAL_TYPE_P (inner_type
))
13637 return TYPE_PRECISION (inner_type
) < TYPE_PRECISION (outer_type
)
13638 && TYPE_UNSIGNED (inner_type
);
13644 return tree_simple_nonnegative_warnv_p (code
, type
);
13647 /* We don't know sign of `t', so be conservative and return false. */
13651 /* Return true if (CODE OP0 OP1) is known to be non-negative. If the return
13652 value is based on the assumption that signed overflow is undefined,
13653 set *STRICT_OVERFLOW_P to true; otherwise, don't change
13654 *STRICT_OVERFLOW_P. DEPTH is the current nesting depth of the query. */
13657 tree_binary_nonnegative_warnv_p (enum tree_code code
, tree type
, tree op0
,
13658 tree op1
, bool *strict_overflow_p
,
13661 if (TYPE_UNSIGNED (type
))
13666 case POINTER_PLUS_EXPR
:
13668 if (FLOAT_TYPE_P (type
))
13669 return RECURSE (op0
) && RECURSE (op1
);
13671 /* zero_extend(x) + zero_extend(y) is non-negative if x and y are
13672 both unsigned and at least 2 bits shorter than the result. */
13673 if (TREE_CODE (type
) == INTEGER_TYPE
13674 && TREE_CODE (op0
) == NOP_EXPR
13675 && TREE_CODE (op1
) == NOP_EXPR
)
13677 tree inner1
= TREE_TYPE (TREE_OPERAND (op0
, 0));
13678 tree inner2
= TREE_TYPE (TREE_OPERAND (op1
, 0));
13679 if (TREE_CODE (inner1
) == INTEGER_TYPE
&& TYPE_UNSIGNED (inner1
)
13680 && TREE_CODE (inner2
) == INTEGER_TYPE
&& TYPE_UNSIGNED (inner2
))
13682 unsigned int prec
= MAX (TYPE_PRECISION (inner1
),
13683 TYPE_PRECISION (inner2
)) + 1;
13684 return prec
< TYPE_PRECISION (type
);
13690 if (FLOAT_TYPE_P (type
) || TYPE_OVERFLOW_UNDEFINED (type
))
13692 /* x * x is always non-negative for floating point x
13693 or without overflow. */
13694 if (operand_equal_p (op0
, op1
, 0)
13695 || (RECURSE (op0
) && RECURSE (op1
)))
13697 if (ANY_INTEGRAL_TYPE_P (type
)
13698 && TYPE_OVERFLOW_UNDEFINED (type
))
13699 *strict_overflow_p
= true;
13704 /* zero_extend(x) * zero_extend(y) is non-negative if x and y are
13705 both unsigned and their total bits is shorter than the result. */
13706 if (TREE_CODE (type
) == INTEGER_TYPE
13707 && (TREE_CODE (op0
) == NOP_EXPR
|| TREE_CODE (op0
) == INTEGER_CST
)
13708 && (TREE_CODE (op1
) == NOP_EXPR
|| TREE_CODE (op1
) == INTEGER_CST
))
13710 tree inner0
= (TREE_CODE (op0
) == NOP_EXPR
)
13711 ? TREE_TYPE (TREE_OPERAND (op0
, 0))
13713 tree inner1
= (TREE_CODE (op1
) == NOP_EXPR
)
13714 ? TREE_TYPE (TREE_OPERAND (op1
, 0))
13717 bool unsigned0
= TYPE_UNSIGNED (inner0
);
13718 bool unsigned1
= TYPE_UNSIGNED (inner1
);
13720 if (TREE_CODE (op0
) == INTEGER_CST
)
13721 unsigned0
= unsigned0
|| tree_int_cst_sgn (op0
) >= 0;
13723 if (TREE_CODE (op1
) == INTEGER_CST
)
13724 unsigned1
= unsigned1
|| tree_int_cst_sgn (op1
) >= 0;
13726 if (TREE_CODE (inner0
) == INTEGER_TYPE
&& unsigned0
13727 && TREE_CODE (inner1
) == INTEGER_TYPE
&& unsigned1
)
13729 unsigned int precision0
= (TREE_CODE (op0
) == INTEGER_CST
)
13730 ? tree_int_cst_min_precision (op0
, UNSIGNED
)
13731 : TYPE_PRECISION (inner0
);
13733 unsigned int precision1
= (TREE_CODE (op1
) == INTEGER_CST
)
13734 ? tree_int_cst_min_precision (op1
, UNSIGNED
)
13735 : TYPE_PRECISION (inner1
);
13737 return precision0
+ precision1
< TYPE_PRECISION (type
);
13744 return RECURSE (op0
) || RECURSE (op1
);
13750 case TRUNC_DIV_EXPR
:
13751 case CEIL_DIV_EXPR
:
13752 case FLOOR_DIV_EXPR
:
13753 case ROUND_DIV_EXPR
:
13754 return RECURSE (op0
) && RECURSE (op1
);
13756 case TRUNC_MOD_EXPR
:
13757 return RECURSE (op0
);
13759 case FLOOR_MOD_EXPR
:
13760 return RECURSE (op1
);
13762 case CEIL_MOD_EXPR
:
13763 case ROUND_MOD_EXPR
:
13765 return tree_simple_nonnegative_warnv_p (code
, type
);
13768 /* We don't know sign of `t', so be conservative and return false. */
13772 /* Return true if T is known to be non-negative. If the return
13773 value is based on the assumption that signed overflow is undefined,
13774 set *STRICT_OVERFLOW_P to true; otherwise, don't change
13775 *STRICT_OVERFLOW_P. DEPTH is the current nesting depth of the query. */
13778 tree_single_nonnegative_warnv_p (tree t
, bool *strict_overflow_p
, int depth
)
13780 if (TYPE_UNSIGNED (TREE_TYPE (t
)))
13783 switch (TREE_CODE (t
))
13786 return tree_int_cst_sgn (t
) >= 0;
13789 return ! REAL_VALUE_NEGATIVE (TREE_REAL_CST (t
));
13792 return ! FIXED_VALUE_NEGATIVE (TREE_FIXED_CST (t
));
13795 return RECURSE (TREE_OPERAND (t
, 1)) && RECURSE (TREE_OPERAND (t
, 2));
13798 /* Limit the depth of recursion to avoid quadratic behavior.
13799 This is expected to catch almost all occurrences in practice.
13800 If this code misses important cases that unbounded recursion
13801 would not, passes that need this information could be revised
13802 to provide it through dataflow propagation. */
13803 return (!name_registered_for_update_p (t
)
13804 && depth
< param_max_ssa_name_query_depth
13805 && gimple_stmt_nonnegative_warnv_p (SSA_NAME_DEF_STMT (t
),
13806 strict_overflow_p
, depth
));
13809 return tree_simple_nonnegative_warnv_p (TREE_CODE (t
), TREE_TYPE (t
));
13813 /* Return true if T is known to be non-negative. If the return
13814 value is based on the assumption that signed overflow is undefined,
13815 set *STRICT_OVERFLOW_P to true; otherwise, don't change
13816 *STRICT_OVERFLOW_P. DEPTH is the current nesting depth of the query. */
13819 tree_call_nonnegative_warnv_p (tree type
, combined_fn fn
, tree arg0
, tree arg1
,
13820 bool *strict_overflow_p
, int depth
)
13841 case CFN_BUILT_IN_BSWAP32
:
13842 case CFN_BUILT_IN_BSWAP64
:
13848 /* sqrt(-0.0) is -0.0. */
13849 if (!HONOR_SIGNED_ZEROS (element_mode (type
)))
13851 return RECURSE (arg0
);
13879 CASE_CFN_NEARBYINT
:
13880 CASE_CFN_NEARBYINT_FN
:
13885 CASE_CFN_ROUNDEVEN
:
13886 CASE_CFN_ROUNDEVEN_FN
:
13891 CASE_CFN_SIGNIFICAND
:
13896 /* True if the 1st argument is nonnegative. */
13897 return RECURSE (arg0
);
13901 /* True if the 1st OR 2nd arguments are nonnegative. */
13902 return RECURSE (arg0
) || RECURSE (arg1
);
13906 /* True if the 1st AND 2nd arguments are nonnegative. */
13907 return RECURSE (arg0
) && RECURSE (arg1
);
13910 CASE_CFN_COPYSIGN_FN
:
13911 /* True if the 2nd argument is nonnegative. */
13912 return RECURSE (arg1
);
13915 /* True if the 1st argument is nonnegative or the second
13916 argument is an even integer. */
13917 if (TREE_CODE (arg1
) == INTEGER_CST
13918 && (TREE_INT_CST_LOW (arg1
) & 1) == 0)
13920 return RECURSE (arg0
);
13923 /* True if the 1st argument is nonnegative or the second
13924 argument is an even integer valued real. */
13925 if (TREE_CODE (arg1
) == REAL_CST
)
13930 c
= TREE_REAL_CST (arg1
);
13931 n
= real_to_integer (&c
);
13934 REAL_VALUE_TYPE cint
;
13935 real_from_integer (&cint
, VOIDmode
, n
, SIGNED
);
13936 if (real_identical (&c
, &cint
))
13940 return RECURSE (arg0
);
13945 return tree_simple_nonnegative_warnv_p (CALL_EXPR
, type
);
13948 /* Return true if T is known to be non-negative. If the return
13949 value is based on the assumption that signed overflow is undefined,
13950 set *STRICT_OVERFLOW_P to true; otherwise, don't change
13951 *STRICT_OVERFLOW_P. DEPTH is the current nesting depth of the query. */
13954 tree_invalid_nonnegative_warnv_p (tree t
, bool *strict_overflow_p
, int depth
)
13956 enum tree_code code
= TREE_CODE (t
);
13957 if (TYPE_UNSIGNED (TREE_TYPE (t
)))
13964 tree temp
= TARGET_EXPR_SLOT (t
);
13965 t
= TARGET_EXPR_INITIAL (t
);
13967 /* If the initializer is non-void, then it's a normal expression
13968 that will be assigned to the slot. */
13969 if (!VOID_TYPE_P (t
))
13970 return RECURSE (t
);
13972 /* Otherwise, the initializer sets the slot in some way. One common
13973 way is an assignment statement at the end of the initializer. */
13976 if (TREE_CODE (t
) == BIND_EXPR
)
13977 t
= expr_last (BIND_EXPR_BODY (t
));
13978 else if (TREE_CODE (t
) == TRY_FINALLY_EXPR
13979 || TREE_CODE (t
) == TRY_CATCH_EXPR
)
13980 t
= expr_last (TREE_OPERAND (t
, 0));
13981 else if (TREE_CODE (t
) == STATEMENT_LIST
)
13986 if (TREE_CODE (t
) == MODIFY_EXPR
13987 && TREE_OPERAND (t
, 0) == temp
)
13988 return RECURSE (TREE_OPERAND (t
, 1));
13995 tree arg0
= call_expr_nargs (t
) > 0 ? CALL_EXPR_ARG (t
, 0) : NULL_TREE
;
13996 tree arg1
= call_expr_nargs (t
) > 1 ? CALL_EXPR_ARG (t
, 1) : NULL_TREE
;
13998 return tree_call_nonnegative_warnv_p (TREE_TYPE (t
),
13999 get_call_combined_fn (t
),
14002 strict_overflow_p
, depth
);
14004 case COMPOUND_EXPR
:
14006 return RECURSE (TREE_OPERAND (t
, 1));
14009 return RECURSE (expr_last (TREE_OPERAND (t
, 1)));
14012 return RECURSE (TREE_OPERAND (t
, 0));
14015 return tree_simple_nonnegative_warnv_p (TREE_CODE (t
), TREE_TYPE (t
));
14020 #undef tree_expr_nonnegative_warnv_p
14022 /* Return true if T is known to be non-negative. If the return
14023 value is based on the assumption that signed overflow is undefined,
14024 set *STRICT_OVERFLOW_P to true; otherwise, don't change
14025 *STRICT_OVERFLOW_P. DEPTH is the current nesting depth of the query. */
14028 tree_expr_nonnegative_warnv_p (tree t
, bool *strict_overflow_p
, int depth
)
14030 enum tree_code code
;
14031 if (t
== error_mark_node
)
14034 code
= TREE_CODE (t
);
14035 switch (TREE_CODE_CLASS (code
))
14038 case tcc_comparison
:
14039 return tree_binary_nonnegative_warnv_p (TREE_CODE (t
),
14041 TREE_OPERAND (t
, 0),
14042 TREE_OPERAND (t
, 1),
14043 strict_overflow_p
, depth
);
14046 return tree_unary_nonnegative_warnv_p (TREE_CODE (t
),
14048 TREE_OPERAND (t
, 0),
14049 strict_overflow_p
, depth
);
14052 case tcc_declaration
:
14053 case tcc_reference
:
14054 return tree_single_nonnegative_warnv_p (t
, strict_overflow_p
, depth
);
14062 case TRUTH_AND_EXPR
:
14063 case TRUTH_OR_EXPR
:
14064 case TRUTH_XOR_EXPR
:
14065 return tree_binary_nonnegative_warnv_p (TREE_CODE (t
),
14067 TREE_OPERAND (t
, 0),
14068 TREE_OPERAND (t
, 1),
14069 strict_overflow_p
, depth
);
14070 case TRUTH_NOT_EXPR
:
14071 return tree_unary_nonnegative_warnv_p (TREE_CODE (t
),
14073 TREE_OPERAND (t
, 0),
14074 strict_overflow_p
, depth
);
14081 case WITH_SIZE_EXPR
:
14083 return tree_single_nonnegative_warnv_p (t
, strict_overflow_p
, depth
);
14086 return tree_invalid_nonnegative_warnv_p (t
, strict_overflow_p
, depth
);
14090 /* Return true if `t' is known to be non-negative. Handle warnings
14091 about undefined signed overflow. */
14094 tree_expr_nonnegative_p (tree t
)
14096 bool ret
, strict_overflow_p
;
14098 strict_overflow_p
= false;
14099 ret
= tree_expr_nonnegative_warnv_p (t
, &strict_overflow_p
);
14100 if (strict_overflow_p
)
14101 fold_overflow_warning (("assuming signed overflow does not occur when "
14102 "determining that expression is always "
14104 WARN_STRICT_OVERFLOW_MISC
);
14109 /* Return true when (CODE OP0) is an address and is known to be nonzero.
14110 For floating point we further ensure that T is not denormal.
14111 Similar logic is present in nonzero_address in rtlanal.h.
14113 If the return value is based on the assumption that signed overflow
14114 is undefined, set *STRICT_OVERFLOW_P to true; otherwise, don't
14115 change *STRICT_OVERFLOW_P. */
14118 tree_unary_nonzero_warnv_p (enum tree_code code
, tree type
, tree op0
,
14119 bool *strict_overflow_p
)
14124 return tree_expr_nonzero_warnv_p (op0
,
14125 strict_overflow_p
);
14129 tree inner_type
= TREE_TYPE (op0
);
14130 tree outer_type
= type
;
14132 return (TYPE_PRECISION (outer_type
) >= TYPE_PRECISION (inner_type
)
14133 && tree_expr_nonzero_warnv_p (op0
,
14134 strict_overflow_p
));
14138 case NON_LVALUE_EXPR
:
14139 return tree_expr_nonzero_warnv_p (op0
,
14140 strict_overflow_p
);
14149 /* Return true when (CODE OP0 OP1) is an address and is known to be nonzero.
14150 For floating point we further ensure that T is not denormal.
14151 Similar logic is present in nonzero_address in rtlanal.h.
14153 If the return value is based on the assumption that signed overflow
14154 is undefined, set *STRICT_OVERFLOW_P to true; otherwise, don't
14155 change *STRICT_OVERFLOW_P. */
14158 tree_binary_nonzero_warnv_p (enum tree_code code
,
14161 tree op1
, bool *strict_overflow_p
)
14163 bool sub_strict_overflow_p
;
14166 case POINTER_PLUS_EXPR
:
14168 if (ANY_INTEGRAL_TYPE_P (type
) && TYPE_OVERFLOW_UNDEFINED (type
))
14170 /* With the presence of negative values it is hard
14171 to say something. */
14172 sub_strict_overflow_p
= false;
14173 if (!tree_expr_nonnegative_warnv_p (op0
,
14174 &sub_strict_overflow_p
)
14175 || !tree_expr_nonnegative_warnv_p (op1
,
14176 &sub_strict_overflow_p
))
14178 /* One of operands must be positive and the other non-negative. */
14179 /* We don't set *STRICT_OVERFLOW_P here: even if this value
14180 overflows, on a twos-complement machine the sum of two
14181 nonnegative numbers can never be zero. */
14182 return (tree_expr_nonzero_warnv_p (op0
,
14184 || tree_expr_nonzero_warnv_p (op1
,
14185 strict_overflow_p
));
14190 if (TYPE_OVERFLOW_UNDEFINED (type
))
14192 if (tree_expr_nonzero_warnv_p (op0
,
14194 && tree_expr_nonzero_warnv_p (op1
,
14195 strict_overflow_p
))
14197 *strict_overflow_p
= true;
14204 sub_strict_overflow_p
= false;
14205 if (tree_expr_nonzero_warnv_p (op0
,
14206 &sub_strict_overflow_p
)
14207 && tree_expr_nonzero_warnv_p (op1
,
14208 &sub_strict_overflow_p
))
14210 if (sub_strict_overflow_p
)
14211 *strict_overflow_p
= true;
14216 sub_strict_overflow_p
= false;
14217 if (tree_expr_nonzero_warnv_p (op0
,
14218 &sub_strict_overflow_p
))
14220 if (sub_strict_overflow_p
)
14221 *strict_overflow_p
= true;
14223 /* When both operands are nonzero, then MAX must be too. */
14224 if (tree_expr_nonzero_warnv_p (op1
,
14225 strict_overflow_p
))
14228 /* MAX where operand 0 is positive is positive. */
14229 return tree_expr_nonnegative_warnv_p (op0
,
14230 strict_overflow_p
);
14232 /* MAX where operand 1 is positive is positive. */
14233 else if (tree_expr_nonzero_warnv_p (op1
,
14234 &sub_strict_overflow_p
)
14235 && tree_expr_nonnegative_warnv_p (op1
,
14236 &sub_strict_overflow_p
))
14238 if (sub_strict_overflow_p
)
14239 *strict_overflow_p
= true;
14245 return (tree_expr_nonzero_warnv_p (op1
,
14247 || tree_expr_nonzero_warnv_p (op0
,
14248 strict_overflow_p
));
14257 /* Return true when T is an address and is known to be nonzero.
14258 For floating point we further ensure that T is not denormal.
14259 Similar logic is present in nonzero_address in rtlanal.h.
14261 If the return value is based on the assumption that signed overflow
14262 is undefined, set *STRICT_OVERFLOW_P to true; otherwise, don't
14263 change *STRICT_OVERFLOW_P. */
14266 tree_single_nonzero_warnv_p (tree t
, bool *strict_overflow_p
)
14268 bool sub_strict_overflow_p
;
14269 switch (TREE_CODE (t
))
14272 return !integer_zerop (t
);
14276 tree base
= TREE_OPERAND (t
, 0);
14278 if (!DECL_P (base
))
14279 base
= get_base_address (base
);
14281 if (base
&& TREE_CODE (base
) == TARGET_EXPR
)
14282 base
= TARGET_EXPR_SLOT (base
);
14287 /* For objects in symbol table check if we know they are non-zero.
14288 Don't do anything for variables and functions before symtab is built;
14289 it is quite possible that they will be declared weak later. */
14290 int nonzero_addr
= maybe_nonzero_address (base
);
14291 if (nonzero_addr
>= 0)
14292 return nonzero_addr
;
14294 /* Constants are never weak. */
14295 if (CONSTANT_CLASS_P (base
))
14302 sub_strict_overflow_p
= false;
14303 if (tree_expr_nonzero_warnv_p (TREE_OPERAND (t
, 1),
14304 &sub_strict_overflow_p
)
14305 && tree_expr_nonzero_warnv_p (TREE_OPERAND (t
, 2),
14306 &sub_strict_overflow_p
))
14308 if (sub_strict_overflow_p
)
14309 *strict_overflow_p
= true;
14315 if (!INTEGRAL_TYPE_P (TREE_TYPE (t
)))
14317 return expr_not_equal_to (t
, wi::zero (TYPE_PRECISION (TREE_TYPE (t
))));
14325 #define integer_valued_real_p(X) \
14326 _Pragma ("GCC error \"Use RECURSE for recursive calls\"") 0
14328 #define RECURSE(X) \
14329 ((integer_valued_real_p) (X, depth + 1))
14331 /* Return true if the floating point result of (CODE OP0) has an
14332 integer value. We also allow +Inf, -Inf and NaN to be considered
14333 integer values. Return false for signaling NaN.
14335 DEPTH is the current nesting depth of the query. */
14338 integer_valued_real_unary_p (tree_code code
, tree op0
, int depth
)
14346 return RECURSE (op0
);
14350 tree type
= TREE_TYPE (op0
);
14351 if (TREE_CODE (type
) == INTEGER_TYPE
)
14353 if (TREE_CODE (type
) == REAL_TYPE
)
14354 return RECURSE (op0
);
14364 /* Return true if the floating point result of (CODE OP0 OP1) has an
14365 integer value. We also allow +Inf, -Inf and NaN to be considered
14366 integer values. Return false for signaling NaN.
14368 DEPTH is the current nesting depth of the query. */
14371 integer_valued_real_binary_p (tree_code code
, tree op0
, tree op1
, int depth
)
14380 return RECURSE (op0
) && RECURSE (op1
);
14388 /* Return true if the floating point result of calling FNDECL with arguments
14389 ARG0 and ARG1 has an integer value. We also allow +Inf, -Inf and NaN to be
14390 considered integer values. Return false for signaling NaN. If FNDECL
14391 takes fewer than 2 arguments, the remaining ARGn are null.
14393 DEPTH is the current nesting depth of the query. */
14396 integer_valued_real_call_p (combined_fn fn
, tree arg0
, tree arg1
, int depth
)
14404 CASE_CFN_NEARBYINT
:
14405 CASE_CFN_NEARBYINT_FN
:
14410 CASE_CFN_ROUNDEVEN
:
14411 CASE_CFN_ROUNDEVEN_FN
:
14420 return RECURSE (arg0
) && RECURSE (arg1
);
14428 /* Return true if the floating point expression T (a GIMPLE_SINGLE_RHS)
14429 has an integer value. We also allow +Inf, -Inf and NaN to be
14430 considered integer values. Return false for signaling NaN.
14432 DEPTH is the current nesting depth of the query. */
14435 integer_valued_real_single_p (tree t
, int depth
)
14437 switch (TREE_CODE (t
))
14440 return real_isinteger (TREE_REAL_CST_PTR (t
), TYPE_MODE (TREE_TYPE (t
)));
14443 return RECURSE (TREE_OPERAND (t
, 1)) && RECURSE (TREE_OPERAND (t
, 2));
14446 /* Limit the depth of recursion to avoid quadratic behavior.
14447 This is expected to catch almost all occurrences in practice.
14448 If this code misses important cases that unbounded recursion
14449 would not, passes that need this information could be revised
14450 to provide it through dataflow propagation. */
14451 return (!name_registered_for_update_p (t
)
14452 && depth
< param_max_ssa_name_query_depth
14453 && gimple_stmt_integer_valued_real_p (SSA_NAME_DEF_STMT (t
),
14462 /* Return true if the floating point expression T (a GIMPLE_INVALID_RHS)
14463 has an integer value. We also allow +Inf, -Inf and NaN to be
14464 considered integer values. Return false for signaling NaN.
14466 DEPTH is the current nesting depth of the query. */
14469 integer_valued_real_invalid_p (tree t
, int depth
)
14471 switch (TREE_CODE (t
))
14473 case COMPOUND_EXPR
:
14476 return RECURSE (TREE_OPERAND (t
, 1));
14479 return RECURSE (TREE_OPERAND (t
, 0));
14488 #undef integer_valued_real_p
14490 /* Return true if the floating point expression T has an integer value.
14491 We also allow +Inf, -Inf and NaN to be considered integer values.
14492 Return false for signaling NaN.
14494 DEPTH is the current nesting depth of the query. */
14497 integer_valued_real_p (tree t
, int depth
)
14499 if (t
== error_mark_node
)
14502 STRIP_ANY_LOCATION_WRAPPER (t
);
14504 tree_code code
= TREE_CODE (t
);
14505 switch (TREE_CODE_CLASS (code
))
14508 case tcc_comparison
:
14509 return integer_valued_real_binary_p (code
, TREE_OPERAND (t
, 0),
14510 TREE_OPERAND (t
, 1), depth
);
14513 return integer_valued_real_unary_p (code
, TREE_OPERAND (t
, 0), depth
);
14516 case tcc_declaration
:
14517 case tcc_reference
:
14518 return integer_valued_real_single_p (t
, depth
);
14528 return integer_valued_real_single_p (t
, depth
);
14532 tree arg0
= (call_expr_nargs (t
) > 0
14533 ? CALL_EXPR_ARG (t
, 0)
14535 tree arg1
= (call_expr_nargs (t
) > 1
14536 ? CALL_EXPR_ARG (t
, 1)
14538 return integer_valued_real_call_p (get_call_combined_fn (t
),
14539 arg0
, arg1
, depth
);
14543 return integer_valued_real_invalid_p (t
, depth
);
14547 /* Given the components of a binary expression CODE, TYPE, OP0 and OP1,
14548 attempt to fold the expression to a constant without modifying TYPE,
14551 If the expression could be simplified to a constant, then return
14552 the constant. If the expression would not be simplified to a
14553 constant, then return NULL_TREE. */
14556 fold_binary_to_constant (enum tree_code code
, tree type
, tree op0
, tree op1
)
14558 tree tem
= fold_binary (code
, type
, op0
, op1
);
14559 return (tem
&& TREE_CONSTANT (tem
)) ? tem
: NULL_TREE
;
14562 /* Given the components of a unary expression CODE, TYPE and OP0,
14563 attempt to fold the expression to a constant without modifying
14566 If the expression could be simplified to a constant, then return
14567 the constant. If the expression would not be simplified to a
14568 constant, then return NULL_TREE. */
14571 fold_unary_to_constant (enum tree_code code
, tree type
, tree op0
)
14573 tree tem
= fold_unary (code
, type
, op0
);
14574 return (tem
&& TREE_CONSTANT (tem
)) ? tem
: NULL_TREE
;
14577 /* If EXP represents referencing an element in a constant string
14578 (either via pointer arithmetic or array indexing), return the
14579 tree representing the value accessed, otherwise return NULL. */
14582 fold_read_from_constant_string (tree exp
)
14584 if ((TREE_CODE (exp
) == INDIRECT_REF
14585 || TREE_CODE (exp
) == ARRAY_REF
)
14586 && TREE_CODE (TREE_TYPE (exp
)) == INTEGER_TYPE
)
14588 tree exp1
= TREE_OPERAND (exp
, 0);
14591 location_t loc
= EXPR_LOCATION (exp
);
14593 if (TREE_CODE (exp
) == INDIRECT_REF
)
14594 string
= string_constant (exp1
, &index
, NULL
, NULL
);
14597 tree low_bound
= array_ref_low_bound (exp
);
14598 index
= fold_convert_loc (loc
, sizetype
, TREE_OPERAND (exp
, 1));
14600 /* Optimize the special-case of a zero lower bound.
14602 We convert the low_bound to sizetype to avoid some problems
14603 with constant folding. (E.g. suppose the lower bound is 1,
14604 and its mode is QI. Without the conversion,l (ARRAY
14605 +(INDEX-(unsigned char)1)) becomes ((ARRAY+(-(unsigned char)1))
14606 +INDEX), which becomes (ARRAY+255+INDEX). Oops!) */
14607 if (! integer_zerop (low_bound
))
14608 index
= size_diffop_loc (loc
, index
,
14609 fold_convert_loc (loc
, sizetype
, low_bound
));
14614 scalar_int_mode char_mode
;
14616 && TYPE_MODE (TREE_TYPE (exp
)) == TYPE_MODE (TREE_TYPE (TREE_TYPE (string
)))
14617 && TREE_CODE (string
) == STRING_CST
14618 && TREE_CODE (index
) == INTEGER_CST
14619 && compare_tree_int (index
, TREE_STRING_LENGTH (string
)) < 0
14620 && is_int_mode (TYPE_MODE (TREE_TYPE (TREE_TYPE (string
))),
14622 && GET_MODE_SIZE (char_mode
) == 1)
14623 return build_int_cst_type (TREE_TYPE (exp
),
14624 (TREE_STRING_POINTER (string
)
14625 [TREE_INT_CST_LOW (index
)]));
14630 /* Folds a read from vector element at IDX of vector ARG. */
14633 fold_read_from_vector (tree arg
, poly_uint64 idx
)
14635 unsigned HOST_WIDE_INT i
;
14636 if (known_lt (idx
, TYPE_VECTOR_SUBPARTS (TREE_TYPE (arg
)))
14637 && known_ge (idx
, 0u)
14638 && idx
.is_constant (&i
))
14640 if (TREE_CODE (arg
) == VECTOR_CST
)
14641 return VECTOR_CST_ELT (arg
, i
);
14642 else if (TREE_CODE (arg
) == CONSTRUCTOR
)
14644 if (i
>= CONSTRUCTOR_NELTS (arg
))
14645 return build_zero_cst (TREE_TYPE (TREE_TYPE (arg
)));
14646 return CONSTRUCTOR_ELT (arg
, i
)->value
;
14652 /* Return the tree for neg (ARG0) when ARG0 is known to be either
14653 an integer constant, real, or fixed-point constant.
14655 TYPE is the type of the result. */
14658 fold_negate_const (tree arg0
, tree type
)
14660 tree t
= NULL_TREE
;
14662 switch (TREE_CODE (arg0
))
14665 t
= build_real (type
, real_value_negate (&TREE_REAL_CST (arg0
)));
14670 FIXED_VALUE_TYPE f
;
14671 bool overflow_p
= fixed_arithmetic (&f
, NEGATE_EXPR
,
14672 &(TREE_FIXED_CST (arg0
)), NULL
,
14673 TYPE_SATURATING (type
));
14674 t
= build_fixed (type
, f
);
14675 /* Propagate overflow flags. */
14676 if (overflow_p
| TREE_OVERFLOW (arg0
))
14677 TREE_OVERFLOW (t
) = 1;
14682 if (poly_int_tree_p (arg0
))
14684 wi::overflow_type overflow
;
14685 poly_wide_int res
= wi::neg (wi::to_poly_wide (arg0
), &overflow
);
14686 t
= force_fit_type (type
, res
, 1,
14687 (overflow
&& ! TYPE_UNSIGNED (type
))
14688 || TREE_OVERFLOW (arg0
));
14692 gcc_unreachable ();
14698 /* Return the tree for abs (ARG0) when ARG0 is known to be either
14699 an integer constant or real constant.
14701 TYPE is the type of the result. */
14704 fold_abs_const (tree arg0
, tree type
)
14706 tree t
= NULL_TREE
;
14708 switch (TREE_CODE (arg0
))
14712 /* If the value is unsigned or non-negative, then the absolute value
14713 is the same as the ordinary value. */
14714 wide_int val
= wi::to_wide (arg0
);
14715 wi::overflow_type overflow
= wi::OVF_NONE
;
14716 if (!wi::neg_p (val
, TYPE_SIGN (TREE_TYPE (arg0
))))
14719 /* If the value is negative, then the absolute value is
14722 val
= wi::neg (val
, &overflow
);
14724 /* Force to the destination type, set TREE_OVERFLOW for signed
14726 t
= force_fit_type (type
, val
, 1, overflow
| TREE_OVERFLOW (arg0
));
14731 if (REAL_VALUE_NEGATIVE (TREE_REAL_CST (arg0
)))
14732 t
= build_real (type
, real_value_negate (&TREE_REAL_CST (arg0
)));
14738 gcc_unreachable ();
14744 /* Return the tree for not (ARG0) when ARG0 is known to be an integer
14745 constant. TYPE is the type of the result. */
14748 fold_not_const (const_tree arg0
, tree type
)
14750 gcc_assert (TREE_CODE (arg0
) == INTEGER_CST
);
14752 return force_fit_type (type
, ~wi::to_wide (arg0
), 0, TREE_OVERFLOW (arg0
));
14755 /* Given CODE, a relational operator, the target type, TYPE and two
14756 constant operands OP0 and OP1, return the result of the
14757 relational operation. If the result is not a compile time
14758 constant, then return NULL_TREE. */
14761 fold_relational_const (enum tree_code code
, tree type
, tree op0
, tree op1
)
14763 int result
, invert
;
14765 /* From here on, the only cases we handle are when the result is
14766 known to be a constant. */
14768 if (TREE_CODE (op0
) == REAL_CST
&& TREE_CODE (op1
) == REAL_CST
)
14770 const REAL_VALUE_TYPE
*c0
= TREE_REAL_CST_PTR (op0
);
14771 const REAL_VALUE_TYPE
*c1
= TREE_REAL_CST_PTR (op1
);
14773 /* Handle the cases where either operand is a NaN. */
14774 if (real_isnan (c0
) || real_isnan (c1
))
14784 case UNORDERED_EXPR
:
14798 if (flag_trapping_math
)
14804 gcc_unreachable ();
14807 return constant_boolean_node (result
, type
);
14810 return constant_boolean_node (real_compare (code
, c0
, c1
), type
);
14813 if (TREE_CODE (op0
) == FIXED_CST
&& TREE_CODE (op1
) == FIXED_CST
)
14815 const FIXED_VALUE_TYPE
*c0
= TREE_FIXED_CST_PTR (op0
);
14816 const FIXED_VALUE_TYPE
*c1
= TREE_FIXED_CST_PTR (op1
);
14817 return constant_boolean_node (fixed_compare (code
, c0
, c1
), type
);
14820 /* Handle equality/inequality of complex constants. */
14821 if (TREE_CODE (op0
) == COMPLEX_CST
&& TREE_CODE (op1
) == COMPLEX_CST
)
14823 tree rcond
= fold_relational_const (code
, type
,
14824 TREE_REALPART (op0
),
14825 TREE_REALPART (op1
));
14826 tree icond
= fold_relational_const (code
, type
,
14827 TREE_IMAGPART (op0
),
14828 TREE_IMAGPART (op1
));
14829 if (code
== EQ_EXPR
)
14830 return fold_build2 (TRUTH_ANDIF_EXPR
, type
, rcond
, icond
);
14831 else if (code
== NE_EXPR
)
14832 return fold_build2 (TRUTH_ORIF_EXPR
, type
, rcond
, icond
);
14837 if (TREE_CODE (op0
) == VECTOR_CST
&& TREE_CODE (op1
) == VECTOR_CST
)
14839 if (!VECTOR_TYPE_P (type
))
14841 /* Have vector comparison with scalar boolean result. */
14842 gcc_assert ((code
== EQ_EXPR
|| code
== NE_EXPR
)
14843 && known_eq (VECTOR_CST_NELTS (op0
),
14844 VECTOR_CST_NELTS (op1
)));
14845 unsigned HOST_WIDE_INT nunits
;
14846 if (!VECTOR_CST_NELTS (op0
).is_constant (&nunits
))
14848 for (unsigned i
= 0; i
< nunits
; i
++)
14850 tree elem0
= VECTOR_CST_ELT (op0
, i
);
14851 tree elem1
= VECTOR_CST_ELT (op1
, i
);
14852 tree tmp
= fold_relational_const (EQ_EXPR
, type
, elem0
, elem1
);
14853 if (tmp
== NULL_TREE
)
14855 if (integer_zerop (tmp
))
14856 return constant_boolean_node (code
== NE_EXPR
, type
);
14858 return constant_boolean_node (code
== EQ_EXPR
, type
);
14860 tree_vector_builder elts
;
14861 if (!elts
.new_binary_operation (type
, op0
, op1
, false))
14863 unsigned int count
= elts
.encoded_nelts ();
14864 for (unsigned i
= 0; i
< count
; i
++)
14866 tree elem_type
= TREE_TYPE (type
);
14867 tree elem0
= VECTOR_CST_ELT (op0
, i
);
14868 tree elem1
= VECTOR_CST_ELT (op1
, i
);
14870 tree tem
= fold_relational_const (code
, elem_type
,
14873 if (tem
== NULL_TREE
)
14876 elts
.quick_push (build_int_cst (elem_type
,
14877 integer_zerop (tem
) ? 0 : -1));
14880 return elts
.build ();
14883 /* From here on we only handle LT, LE, GT, GE, EQ and NE.
14885 To compute GT, swap the arguments and do LT.
14886 To compute GE, do LT and invert the result.
14887 To compute LE, swap the arguments, do LT and invert the result.
14888 To compute NE, do EQ and invert the result.
14890 Therefore, the code below must handle only EQ and LT. */
14892 if (code
== LE_EXPR
|| code
== GT_EXPR
)
14894 std::swap (op0
, op1
);
14895 code
= swap_tree_comparison (code
);
14898 /* Note that it is safe to invert for real values here because we
14899 have already handled the one case that it matters. */
14902 if (code
== NE_EXPR
|| code
== GE_EXPR
)
14905 code
= invert_tree_comparison (code
, false);
14908 /* Compute a result for LT or EQ if args permit;
14909 Otherwise return T. */
14910 if (TREE_CODE (op0
) == INTEGER_CST
&& TREE_CODE (op1
) == INTEGER_CST
)
14912 if (code
== EQ_EXPR
)
14913 result
= tree_int_cst_equal (op0
, op1
);
14915 result
= tree_int_cst_lt (op0
, op1
);
14922 return constant_boolean_node (result
, type
);
14925 /* If necessary, return a CLEANUP_POINT_EXPR for EXPR with the
14926 indicated TYPE. If no CLEANUP_POINT_EXPR is necessary, return EXPR
14930 fold_build_cleanup_point_expr (tree type
, tree expr
)
14932 /* If the expression does not have side effects then we don't have to wrap
14933 it with a cleanup point expression. */
14934 if (!TREE_SIDE_EFFECTS (expr
))
14937 /* If the expression is a return, check to see if the expression inside the
14938 return has no side effects or the right hand side of the modify expression
14939 inside the return. If either don't have side effects set we don't need to
14940 wrap the expression in a cleanup point expression. Note we don't check the
14941 left hand side of the modify because it should always be a return decl. */
14942 if (TREE_CODE (expr
) == RETURN_EXPR
)
14944 tree op
= TREE_OPERAND (expr
, 0);
14945 if (!op
|| !TREE_SIDE_EFFECTS (op
))
14947 op
= TREE_OPERAND (op
, 1);
14948 if (!TREE_SIDE_EFFECTS (op
))
14952 return build1_loc (EXPR_LOCATION (expr
), CLEANUP_POINT_EXPR
, type
, expr
);
14955 /* Given a pointer value OP0 and a type TYPE, return a simplified version
14956 of an indirection through OP0, or NULL_TREE if no simplification is
14960 fold_indirect_ref_1 (location_t loc
, tree type
, tree op0
)
14964 poly_uint64 const_op01
;
14967 subtype
= TREE_TYPE (sub
);
14968 if (!POINTER_TYPE_P (subtype
)
14969 || TYPE_REF_CAN_ALIAS_ALL (TREE_TYPE (op0
)))
14972 if (TREE_CODE (sub
) == ADDR_EXPR
)
14974 tree op
= TREE_OPERAND (sub
, 0);
14975 tree optype
= TREE_TYPE (op
);
14977 /* *&CONST_DECL -> to the value of the const decl. */
14978 if (TREE_CODE (op
) == CONST_DECL
)
14979 return DECL_INITIAL (op
);
14980 /* *&p => p; make sure to handle *&"str"[cst] here. */
14981 if (type
== optype
)
14983 tree fop
= fold_read_from_constant_string (op
);
14989 /* *(foo *)&fooarray => fooarray[0] */
14990 else if (TREE_CODE (optype
) == ARRAY_TYPE
14991 && type
== TREE_TYPE (optype
)
14992 && (!in_gimple_form
14993 || TREE_CODE (TYPE_SIZE (type
)) == INTEGER_CST
))
14995 tree type_domain
= TYPE_DOMAIN (optype
);
14996 tree min_val
= size_zero_node
;
14997 if (type_domain
&& TYPE_MIN_VALUE (type_domain
))
14998 min_val
= TYPE_MIN_VALUE (type_domain
);
15000 && TREE_CODE (min_val
) != INTEGER_CST
)
15002 return build4_loc (loc
, ARRAY_REF
, type
, op
, min_val
,
15003 NULL_TREE
, NULL_TREE
);
15005 /* *(foo *)&complexfoo => __real__ complexfoo */
15006 else if (TREE_CODE (optype
) == COMPLEX_TYPE
15007 && type
== TREE_TYPE (optype
))
15008 return fold_build1_loc (loc
, REALPART_EXPR
, type
, op
);
15009 /* *(foo *)&vectorfoo => BIT_FIELD_REF<vectorfoo,...> */
15010 else if (VECTOR_TYPE_P (optype
)
15011 && type
== TREE_TYPE (optype
))
15013 tree part_width
= TYPE_SIZE (type
);
15014 tree index
= bitsize_int (0);
15015 return fold_build3_loc (loc
, BIT_FIELD_REF
, type
, op
, part_width
,
15020 if (TREE_CODE (sub
) == POINTER_PLUS_EXPR
15021 && poly_int_tree_p (TREE_OPERAND (sub
, 1), &const_op01
))
15023 tree op00
= TREE_OPERAND (sub
, 0);
15024 tree op01
= TREE_OPERAND (sub
, 1);
15027 if (TREE_CODE (op00
) == ADDR_EXPR
)
15030 op00
= TREE_OPERAND (op00
, 0);
15031 op00type
= TREE_TYPE (op00
);
15033 /* ((foo*)&vectorfoo)[1] => BIT_FIELD_REF<vectorfoo,...> */
15034 if (VECTOR_TYPE_P (op00type
)
15035 && type
== TREE_TYPE (op00type
)
15036 /* POINTER_PLUS_EXPR second operand is sizetype, unsigned,
15037 but we want to treat offsets with MSB set as negative.
15038 For the code below negative offsets are invalid and
15039 TYPE_SIZE of the element is something unsigned, so
15040 check whether op01 fits into poly_int64, which implies
15041 it is from 0 to INTTYPE_MAXIMUM (HOST_WIDE_INT), and
15042 then just use poly_uint64 because we want to treat the
15043 value as unsigned. */
15044 && tree_fits_poly_int64_p (op01
))
15046 tree part_width
= TYPE_SIZE (type
);
15047 poly_uint64 max_offset
15048 = (tree_to_uhwi (part_width
) / BITS_PER_UNIT
15049 * TYPE_VECTOR_SUBPARTS (op00type
));
15050 if (known_lt (const_op01
, max_offset
))
15052 tree index
= bitsize_int (const_op01
* BITS_PER_UNIT
);
15053 return fold_build3_loc (loc
,
15054 BIT_FIELD_REF
, type
, op00
,
15055 part_width
, index
);
15058 /* ((foo*)&complexfoo)[1] => __imag__ complexfoo */
15059 else if (TREE_CODE (op00type
) == COMPLEX_TYPE
15060 && type
== TREE_TYPE (op00type
))
15062 if (known_eq (wi::to_poly_offset (TYPE_SIZE_UNIT (type
)),
15064 return fold_build1_loc (loc
, IMAGPART_EXPR
, type
, op00
);
15066 /* ((foo *)&fooarray)[1] => fooarray[1] */
15067 else if (TREE_CODE (op00type
) == ARRAY_TYPE
15068 && type
== TREE_TYPE (op00type
))
15070 tree type_domain
= TYPE_DOMAIN (op00type
);
15071 tree min_val
= size_zero_node
;
15072 if (type_domain
&& TYPE_MIN_VALUE (type_domain
))
15073 min_val
= TYPE_MIN_VALUE (type_domain
);
15074 poly_uint64 type_size
, index
;
15075 if (poly_int_tree_p (min_val
)
15076 && poly_int_tree_p (TYPE_SIZE_UNIT (type
), &type_size
)
15077 && multiple_p (const_op01
, type_size
, &index
))
15079 poly_offset_int off
= index
+ wi::to_poly_offset (min_val
);
15080 op01
= wide_int_to_tree (sizetype
, off
);
15081 return build4_loc (loc
, ARRAY_REF
, type
, op00
, op01
,
15082 NULL_TREE
, NULL_TREE
);
15088 /* *(foo *)fooarrptr => (*fooarrptr)[0] */
15089 if (TREE_CODE (TREE_TYPE (subtype
)) == ARRAY_TYPE
15090 && type
== TREE_TYPE (TREE_TYPE (subtype
))
15091 && (!in_gimple_form
15092 || TREE_CODE (TYPE_SIZE (type
)) == INTEGER_CST
))
15095 tree min_val
= size_zero_node
;
15096 sub
= build_fold_indirect_ref_loc (loc
, sub
);
15097 type_domain
= TYPE_DOMAIN (TREE_TYPE (sub
));
15098 if (type_domain
&& TYPE_MIN_VALUE (type_domain
))
15099 min_val
= TYPE_MIN_VALUE (type_domain
);
15101 && TREE_CODE (min_val
) != INTEGER_CST
)
15103 return build4_loc (loc
, ARRAY_REF
, type
, sub
, min_val
, NULL_TREE
,
15110 /* Builds an expression for an indirection through T, simplifying some
15114 build_fold_indirect_ref_loc (location_t loc
, tree t
)
15116 tree type
= TREE_TYPE (TREE_TYPE (t
));
15117 tree sub
= fold_indirect_ref_1 (loc
, type
, t
);
15122 return build1_loc (loc
, INDIRECT_REF
, type
, t
);
15125 /* Given an INDIRECT_REF T, return either T or a simplified version. */
15128 fold_indirect_ref_loc (location_t loc
, tree t
)
15130 tree sub
= fold_indirect_ref_1 (loc
, TREE_TYPE (t
), TREE_OPERAND (t
, 0));
15138 /* Strip non-trapping, non-side-effecting tree nodes from an expression
15139 whose result is ignored. The type of the returned tree need not be
15140 the same as the original expression. */
15143 fold_ignored_result (tree t
)
15145 if (!TREE_SIDE_EFFECTS (t
))
15146 return integer_zero_node
;
15149 switch (TREE_CODE_CLASS (TREE_CODE (t
)))
15152 t
= TREE_OPERAND (t
, 0);
15156 case tcc_comparison
:
15157 if (!TREE_SIDE_EFFECTS (TREE_OPERAND (t
, 1)))
15158 t
= TREE_OPERAND (t
, 0);
15159 else if (!TREE_SIDE_EFFECTS (TREE_OPERAND (t
, 0)))
15160 t
= TREE_OPERAND (t
, 1);
15165 case tcc_expression
:
15166 switch (TREE_CODE (t
))
15168 case COMPOUND_EXPR
:
15169 if (TREE_SIDE_EFFECTS (TREE_OPERAND (t
, 1)))
15171 t
= TREE_OPERAND (t
, 0);
15175 if (TREE_SIDE_EFFECTS (TREE_OPERAND (t
, 1))
15176 || TREE_SIDE_EFFECTS (TREE_OPERAND (t
, 2)))
15178 t
= TREE_OPERAND (t
, 0);
15191 /* Return the value of VALUE, rounded up to a multiple of DIVISOR. */
15194 round_up_loc (location_t loc
, tree value
, unsigned int divisor
)
15196 tree div
= NULL_TREE
;
15201 /* See if VALUE is already a multiple of DIVISOR. If so, we don't
15202 have to do anything. Only do this when we are not given a const,
15203 because in that case, this check is more expensive than just
15205 if (TREE_CODE (value
) != INTEGER_CST
)
15207 div
= build_int_cst (TREE_TYPE (value
), divisor
);
15209 if (multiple_of_p (TREE_TYPE (value
), value
, div
))
15213 /* If divisor is a power of two, simplify this to bit manipulation. */
15214 if (pow2_or_zerop (divisor
))
15216 if (TREE_CODE (value
) == INTEGER_CST
)
15218 wide_int val
= wi::to_wide (value
);
15221 if ((val
& (divisor
- 1)) == 0)
15224 overflow_p
= TREE_OVERFLOW (value
);
15225 val
+= divisor
- 1;
15226 val
&= (int) -divisor
;
15230 return force_fit_type (TREE_TYPE (value
), val
, -1, overflow_p
);
15236 t
= build_int_cst (TREE_TYPE (value
), divisor
- 1);
15237 value
= size_binop_loc (loc
, PLUS_EXPR
, value
, t
);
15238 t
= build_int_cst (TREE_TYPE (value
), - (int) divisor
);
15239 value
= size_binop_loc (loc
, BIT_AND_EXPR
, value
, t
);
15245 div
= build_int_cst (TREE_TYPE (value
), divisor
);
15246 value
= size_binop_loc (loc
, CEIL_DIV_EXPR
, value
, div
);
15247 value
= size_binop_loc (loc
, MULT_EXPR
, value
, div
);
15253 /* Likewise, but round down. */
15256 round_down_loc (location_t loc
, tree value
, int divisor
)
15258 tree div
= NULL_TREE
;
15260 gcc_assert (divisor
> 0);
15264 /* See if VALUE is already a multiple of DIVISOR. If so, we don't
15265 have to do anything. Only do this when we are not given a const,
15266 because in that case, this check is more expensive than just
15268 if (TREE_CODE (value
) != INTEGER_CST
)
15270 div
= build_int_cst (TREE_TYPE (value
), divisor
);
15272 if (multiple_of_p (TREE_TYPE (value
), value
, div
))
15276 /* If divisor is a power of two, simplify this to bit manipulation. */
15277 if (pow2_or_zerop (divisor
))
15281 t
= build_int_cst (TREE_TYPE (value
), -divisor
);
15282 value
= size_binop_loc (loc
, BIT_AND_EXPR
, value
, t
);
15287 div
= build_int_cst (TREE_TYPE (value
), divisor
);
15288 value
= size_binop_loc (loc
, FLOOR_DIV_EXPR
, value
, div
);
15289 value
= size_binop_loc (loc
, MULT_EXPR
, value
, div
);
15295 /* Returns the pointer to the base of the object addressed by EXP and
15296 extracts the information about the offset of the access, storing it
15297 to PBITPOS and POFFSET. */
15300 split_address_to_core_and_offset (tree exp
,
15301 poly_int64_pod
*pbitpos
, tree
*poffset
)
15305 int unsignedp
, reversep
, volatilep
;
15306 poly_int64 bitsize
;
15307 location_t loc
= EXPR_LOCATION (exp
);
15309 if (TREE_CODE (exp
) == ADDR_EXPR
)
15311 core
= get_inner_reference (TREE_OPERAND (exp
, 0), &bitsize
, pbitpos
,
15312 poffset
, &mode
, &unsignedp
, &reversep
,
15314 core
= build_fold_addr_expr_loc (loc
, core
);
15316 else if (TREE_CODE (exp
) == POINTER_PLUS_EXPR
)
15318 core
= TREE_OPERAND (exp
, 0);
15321 *poffset
= TREE_OPERAND (exp
, 1);
15322 if (poly_int_tree_p (*poffset
))
15324 poly_offset_int tem
15325 = wi::sext (wi::to_poly_offset (*poffset
),
15326 TYPE_PRECISION (TREE_TYPE (*poffset
)));
15327 tem
<<= LOG2_BITS_PER_UNIT
;
15328 if (tem
.to_shwi (pbitpos
))
15329 *poffset
= NULL_TREE
;
15336 *poffset
= NULL_TREE
;
15342 /* Returns true if addresses of E1 and E2 differ by a constant, false
15343 otherwise. If they do, E1 - E2 is stored in *DIFF. */
15346 ptr_difference_const (tree e1
, tree e2
, poly_int64_pod
*diff
)
15349 poly_int64 bitpos1
, bitpos2
;
15350 tree toffset1
, toffset2
, tdiff
, type
;
15352 core1
= split_address_to_core_and_offset (e1
, &bitpos1
, &toffset1
);
15353 core2
= split_address_to_core_and_offset (e2
, &bitpos2
, &toffset2
);
15355 poly_int64 bytepos1
, bytepos2
;
15356 if (!multiple_p (bitpos1
, BITS_PER_UNIT
, &bytepos1
)
15357 || !multiple_p (bitpos2
, BITS_PER_UNIT
, &bytepos2
)
15358 || !operand_equal_p (core1
, core2
, 0))
15361 if (toffset1
&& toffset2
)
15363 type
= TREE_TYPE (toffset1
);
15364 if (type
!= TREE_TYPE (toffset2
))
15365 toffset2
= fold_convert (type
, toffset2
);
15367 tdiff
= fold_build2 (MINUS_EXPR
, type
, toffset1
, toffset2
);
15368 if (!cst_and_fits_in_hwi (tdiff
))
15371 *diff
= int_cst_value (tdiff
);
15373 else if (toffset1
|| toffset2
)
15375 /* If only one of the offsets is non-constant, the difference cannot
15382 *diff
+= bytepos1
- bytepos2
;
15386 /* Return OFF converted to a pointer offset type suitable as offset for
15387 POINTER_PLUS_EXPR. Use location LOC for this conversion. */
15389 convert_to_ptrofftype_loc (location_t loc
, tree off
)
15391 return fold_convert_loc (loc
, sizetype
, off
);
15394 /* Build and fold a POINTER_PLUS_EXPR at LOC offsetting PTR by OFF. */
15396 fold_build_pointer_plus_loc (location_t loc
, tree ptr
, tree off
)
15398 return fold_build2_loc (loc
, POINTER_PLUS_EXPR
, TREE_TYPE (ptr
),
15399 ptr
, convert_to_ptrofftype_loc (loc
, off
));
15402 /* Build and fold a POINTER_PLUS_EXPR at LOC offsetting PTR by OFF. */
15404 fold_build_pointer_plus_hwi_loc (location_t loc
, tree ptr
, HOST_WIDE_INT off
)
15406 return fold_build2_loc (loc
, POINTER_PLUS_EXPR
, TREE_TYPE (ptr
),
15407 ptr
, size_int (off
));
15410 /* Return a pointer P to a NUL-terminated string representing the sequence
15411 of constant characters referred to by SRC (or a subsequence of such
15412 characters within it if SRC is a reference to a string plus some
15413 constant offset). If STRLEN is non-null, store the number of bytes
15414 in the string constant including the terminating NUL char. *STRLEN is
15415 typically strlen(P) + 1 in the absence of embedded NUL characters. */
15418 c_getstr (tree src
, unsigned HOST_WIDE_INT
*strlen
/* = NULL */)
15426 src
= string_constant (src
, &offset_node
, &mem_size
, NULL
);
15430 unsigned HOST_WIDE_INT offset
= 0;
15431 if (offset_node
!= NULL_TREE
)
15433 if (!tree_fits_uhwi_p (offset_node
))
15436 offset
= tree_to_uhwi (offset_node
);
15439 if (!tree_fits_uhwi_p (mem_size
))
15442 /* STRING_LENGTH is the size of the string literal, including any
15443 embedded NULs. STRING_SIZE is the size of the array the string
15444 literal is stored in. */
15445 unsigned HOST_WIDE_INT string_length
= TREE_STRING_LENGTH (src
);
15446 unsigned HOST_WIDE_INT string_size
= tree_to_uhwi (mem_size
);
15448 /* Ideally this would turn into a gcc_checking_assert over time. */
15449 if (string_length
> string_size
)
15450 string_length
= string_size
;
15452 const char *string
= TREE_STRING_POINTER (src
);
15454 /* Ideally this would turn into a gcc_checking_assert over time. */
15455 if (string_length
> string_size
)
15456 string_length
= string_size
;
15458 if (string_length
== 0
15459 || offset
>= string_size
)
15464 /* Compute and store the length of the substring at OFFSET.
15465 All offsets past the initial length refer to null strings. */
15466 if (offset
< string_length
)
15467 *strlen
= string_length
- offset
;
15473 tree eltype
= TREE_TYPE (TREE_TYPE (src
));
15474 /* Support only properly NUL-terminated single byte strings. */
15475 if (tree_to_uhwi (TYPE_SIZE_UNIT (eltype
)) != 1)
15477 if (string
[string_length
- 1] != '\0')
15481 return offset
< string_length
? string
+ offset
: "";
15484 /* Given a tree T, compute which bits in T may be nonzero. */
15487 tree_nonzero_bits (const_tree t
)
15489 switch (TREE_CODE (t
))
15492 return wi::to_wide (t
);
15494 return get_nonzero_bits (t
);
15495 case NON_LVALUE_EXPR
:
15497 return tree_nonzero_bits (TREE_OPERAND (t
, 0));
15499 return wi::bit_and (tree_nonzero_bits (TREE_OPERAND (t
, 0)),
15500 tree_nonzero_bits (TREE_OPERAND (t
, 1)));
15503 return wi::bit_or (tree_nonzero_bits (TREE_OPERAND (t
, 0)),
15504 tree_nonzero_bits (TREE_OPERAND (t
, 1)));
15506 return wi::bit_or (tree_nonzero_bits (TREE_OPERAND (t
, 1)),
15507 tree_nonzero_bits (TREE_OPERAND (t
, 2)));
15509 return wide_int::from (tree_nonzero_bits (TREE_OPERAND (t
, 0)),
15510 TYPE_PRECISION (TREE_TYPE (t
)),
15511 TYPE_SIGN (TREE_TYPE (TREE_OPERAND (t
, 0))));
15513 if (INTEGRAL_TYPE_P (TREE_TYPE (t
)))
15515 wide_int nzbits1
= tree_nonzero_bits (TREE_OPERAND (t
, 0));
15516 wide_int nzbits2
= tree_nonzero_bits (TREE_OPERAND (t
, 1));
15517 if (wi::bit_and (nzbits1
, nzbits2
) == 0)
15518 return wi::bit_or (nzbits1
, nzbits2
);
15522 if (TREE_CODE (TREE_OPERAND (t
, 1)) == INTEGER_CST
)
15524 tree type
= TREE_TYPE (t
);
15525 wide_int nzbits
= tree_nonzero_bits (TREE_OPERAND (t
, 0));
15526 wide_int arg1
= wi::to_wide (TREE_OPERAND (t
, 1),
15527 TYPE_PRECISION (type
));
15528 return wi::neg_p (arg1
)
15529 ? wi::rshift (nzbits
, -arg1
, TYPE_SIGN (type
))
15530 : wi::lshift (nzbits
, arg1
);
15534 if (TREE_CODE (TREE_OPERAND (t
, 1)) == INTEGER_CST
)
15536 tree type
= TREE_TYPE (t
);
15537 wide_int nzbits
= tree_nonzero_bits (TREE_OPERAND (t
, 0));
15538 wide_int arg1
= wi::to_wide (TREE_OPERAND (t
, 1),
15539 TYPE_PRECISION (type
));
15540 return wi::neg_p (arg1
)
15541 ? wi::lshift (nzbits
, -arg1
)
15542 : wi::rshift (nzbits
, arg1
, TYPE_SIGN (type
));
15549 return wi::shwi (-1, TYPE_PRECISION (TREE_TYPE (t
)));
15554 namespace selftest
{
15556 /* Helper functions for writing tests of folding trees. */
15558 /* Verify that the binary op (LHS CODE RHS) folds to CONSTANT. */
15561 assert_binop_folds_to_const (tree lhs
, enum tree_code code
, tree rhs
,
15564 ASSERT_EQ (constant
, fold_build2 (code
, TREE_TYPE (lhs
), lhs
, rhs
));
15567 /* Verify that the binary op (LHS CODE RHS) folds to an NON_LVALUE_EXPR
15568 wrapping WRAPPED_EXPR. */
15571 assert_binop_folds_to_nonlvalue (tree lhs
, enum tree_code code
, tree rhs
,
15574 tree result
= fold_build2 (code
, TREE_TYPE (lhs
), lhs
, rhs
);
15575 ASSERT_NE (wrapped_expr
, result
);
15576 ASSERT_EQ (NON_LVALUE_EXPR
, TREE_CODE (result
));
15577 ASSERT_EQ (wrapped_expr
, TREE_OPERAND (result
, 0));
15580 /* Verify that various arithmetic binary operations are folded
15584 test_arithmetic_folding ()
15586 tree type
= integer_type_node
;
15587 tree x
= create_tmp_var_raw (type
, "x");
15588 tree zero
= build_zero_cst (type
);
15589 tree one
= build_int_cst (type
, 1);
15592 /* 1 <-- (0 + 1) */
15593 assert_binop_folds_to_const (zero
, PLUS_EXPR
, one
,
15595 assert_binop_folds_to_const (one
, PLUS_EXPR
, zero
,
15598 /* (nonlvalue)x <-- (x + 0) */
15599 assert_binop_folds_to_nonlvalue (x
, PLUS_EXPR
, zero
,
15603 /* 0 <-- (x - x) */
15604 assert_binop_folds_to_const (x
, MINUS_EXPR
, x
,
15606 assert_binop_folds_to_nonlvalue (x
, MINUS_EXPR
, zero
,
15609 /* Multiplication. */
15610 /* 0 <-- (x * 0) */
15611 assert_binop_folds_to_const (x
, MULT_EXPR
, zero
,
15614 /* (nonlvalue)x <-- (x * 1) */
15615 assert_binop_folds_to_nonlvalue (x
, MULT_EXPR
, one
,
15619 /* Verify that various binary operations on vectors are folded
15623 test_vector_folding ()
15625 tree inner_type
= integer_type_node
;
15626 tree type
= build_vector_type (inner_type
, 4);
15627 tree zero
= build_zero_cst (type
);
15628 tree one
= build_one_cst (type
);
15629 tree index
= build_index_vector (type
, 0, 1);
15631 /* Verify equality tests that return a scalar boolean result. */
15632 tree res_type
= boolean_type_node
;
15633 ASSERT_FALSE (integer_nonzerop (fold_build2 (EQ_EXPR
, res_type
, zero
, one
)));
15634 ASSERT_TRUE (integer_nonzerop (fold_build2 (EQ_EXPR
, res_type
, zero
, zero
)));
15635 ASSERT_TRUE (integer_nonzerop (fold_build2 (NE_EXPR
, res_type
, zero
, one
)));
15636 ASSERT_FALSE (integer_nonzerop (fold_build2 (NE_EXPR
, res_type
, one
, one
)));
15637 ASSERT_TRUE (integer_nonzerop (fold_build2 (NE_EXPR
, res_type
, index
, one
)));
15638 ASSERT_FALSE (integer_nonzerop (fold_build2 (EQ_EXPR
, res_type
,
15640 ASSERT_FALSE (integer_nonzerop (fold_build2 (NE_EXPR
, res_type
,
15642 ASSERT_TRUE (integer_nonzerop (fold_build2 (EQ_EXPR
, res_type
,
15646 /* Verify folding of VEC_DUPLICATE_EXPRs. */
15649 test_vec_duplicate_folding ()
15651 scalar_int_mode int_mode
= SCALAR_INT_TYPE_MODE (ssizetype
);
15652 machine_mode vec_mode
= targetm
.vectorize
.preferred_simd_mode (int_mode
);
15653 /* This will be 1 if VEC_MODE isn't a vector mode. */
15654 poly_uint64 nunits
= GET_MODE_NUNITS (vec_mode
);
15656 tree type
= build_vector_type (ssizetype
, nunits
);
15657 tree dup5_expr
= fold_unary (VEC_DUPLICATE_EXPR
, type
, ssize_int (5));
15658 tree dup5_cst
= build_vector_from_val (type
, ssize_int (5));
15659 ASSERT_TRUE (operand_equal_p (dup5_expr
, dup5_cst
, 0));
15662 /* Run all of the selftests within this file. */
15665 fold_const_c_tests ()
15667 test_arithmetic_folding ();
15668 test_vector_folding ();
15669 test_vec_duplicate_folding ();
15672 } // namespace selftest
15674 #endif /* CHECKING_P */