2 Copyright (C) 2003-2018 Free Software Foundation, Inc.
3 Contributed by Dorit Naishlos <dorit@il.ibm.com> and
4 Ira Rosen <irar@il.ibm.com>
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
24 #include "coretypes.h"
31 #include "tree-pass.h"
33 #include "optabs-tree.h"
34 #include "diagnostic-core.h"
35 #include "fold-const.h"
36 #include "stor-layout.h"
39 #include "gimple-iterator.h"
40 #include "gimplify-me.h"
41 #include "tree-ssa-loop-ivopts.h"
42 #include "tree-ssa-loop-manip.h"
43 #include "tree-ssa-loop-niter.h"
44 #include "tree-ssa-loop.h"
47 #include "tree-scalar-evolution.h"
48 #include "tree-vectorizer.h"
49 #include "gimple-fold.h"
52 #include "tree-if-conv.h"
53 #include "internal-fn.h"
54 #include "tree-vector-builder.h"
55 #include "vec-perm-indices.h"
58 /* Loop Vectorization Pass.
60 This pass tries to vectorize loops.
62 For example, the vectorizer transforms the following simple loop:
64 short a[N]; short b[N]; short c[N]; int i;
70 as if it was manually vectorized by rewriting the source code into:
72 typedef int __attribute__((mode(V8HI))) v8hi;
73 short a[N]; short b[N]; short c[N]; int i;
74 v8hi *pa = (v8hi*)a, *pb = (v8hi*)b, *pc = (v8hi*)c;
77 for (i=0; i<N/8; i++){
84 The main entry to this pass is vectorize_loops(), in which
85 the vectorizer applies a set of analyses on a given set of loops,
86 followed by the actual vectorization transformation for the loops that
87 had successfully passed the analysis phase.
88 Throughout this pass we make a distinction between two types of
89 data: scalars (which are represented by SSA_NAMES), and memory references
90 ("data-refs"). These two types of data require different handling both
91 during analysis and transformation. The types of data-refs that the
92 vectorizer currently supports are ARRAY_REFS which base is an array DECL
93 (not a pointer), and INDIRECT_REFS through pointers; both array and pointer
94 accesses are required to have a simple (consecutive) access pattern.
98 The driver for the analysis phase is vect_analyze_loop().
99 It applies a set of analyses, some of which rely on the scalar evolution
100 analyzer (scev) developed by Sebastian Pop.
102 During the analysis phase the vectorizer records some information
103 per stmt in a "stmt_vec_info" struct which is attached to each stmt in the
104 loop, as well as general information about the loop as a whole, which is
105 recorded in a "loop_vec_info" struct attached to each loop.
107 Transformation phase:
108 =====================
109 The loop transformation phase scans all the stmts in the loop, and
110 creates a vector stmt (or a sequence of stmts) for each scalar stmt S in
111 the loop that needs to be vectorized. It inserts the vector code sequence
112 just before the scalar stmt S, and records a pointer to the vector code
113 in STMT_VINFO_VEC_STMT (stmt_info) (stmt_info is the stmt_vec_info struct
114 attached to S). This pointer will be used for the vectorization of following
115 stmts which use the def of stmt S. Stmt S is removed if it writes to memory;
116 otherwise, we rely on dead code elimination for removing it.
118 For example, say stmt S1 was vectorized into stmt VS1:
121 S1: b = x[i]; STMT_VINFO_VEC_STMT (stmt_info (S1)) = VS1
124 To vectorize stmt S2, the vectorizer first finds the stmt that defines
125 the operand 'b' (S1), and gets the relevant vector def 'vb' from the
126 vector stmt VS1 pointed to by STMT_VINFO_VEC_STMT (stmt_info (S1)). The
127 resulting sequence would be:
130 S1: b = x[i]; STMT_VINFO_VEC_STMT (stmt_info (S1)) = VS1
132 S2: a = b; STMT_VINFO_VEC_STMT (stmt_info (S2)) = VS2
134 Operands that are not SSA_NAMEs, are data-refs that appear in
135 load/store operations (like 'x[i]' in S1), and are handled differently.
139 Currently the only target specific information that is used is the
140 size of the vector (in bytes) - "TARGET_VECTORIZE_UNITS_PER_SIMD_WORD".
141 Targets that can support different sizes of vectors, for now will need
142 to specify one value for "TARGET_VECTORIZE_UNITS_PER_SIMD_WORD". More
143 flexibility will be added in the future.
145 Since we only vectorize operations which vector form can be
146 expressed using existing tree codes, to verify that an operation is
147 supported, the vectorizer checks the relevant optab at the relevant
148 machine_mode (e.g, optab_handler (add_optab, V8HImode)). If
149 the value found is CODE_FOR_nothing, then there's no target support, and
150 we can't vectorize the stmt.
152 For additional information on this project see:
153 http://gcc.gnu.org/projects/tree-ssa/vectorization.html
156 static void vect_estimate_min_profitable_iters (loop_vec_info
, int *, int *);
158 /* Subroutine of vect_determine_vf_for_stmt that handles only one
159 statement. VECTYPE_MAYBE_SET_P is true if STMT_VINFO_VECTYPE
160 may already be set for general statements (not just data refs). */
163 vect_determine_vf_for_stmt_1 (stmt_vec_info stmt_info
,
164 bool vectype_maybe_set_p
,
166 vec
<stmt_vec_info
> *mask_producers
)
168 gimple
*stmt
= stmt_info
->stmt
;
170 if ((!STMT_VINFO_RELEVANT_P (stmt_info
)
171 && !STMT_VINFO_LIVE_P (stmt_info
))
172 || gimple_clobber_p (stmt
))
174 if (dump_enabled_p ())
175 dump_printf_loc (MSG_NOTE
, vect_location
, "skip.\n");
179 tree stmt_vectype
, nunits_vectype
;
180 if (!vect_get_vector_types_for_stmt (stmt_info
, &stmt_vectype
,
186 if (STMT_VINFO_VECTYPE (stmt_info
))
187 /* The only case when a vectype had been already set is for stmts
188 that contain a data ref, or for "pattern-stmts" (stmts generated
189 by the vectorizer to represent/replace a certain idiom). */
190 gcc_assert ((STMT_VINFO_DATA_REF (stmt_info
)
191 || vectype_maybe_set_p
)
192 && STMT_VINFO_VECTYPE (stmt_info
) == stmt_vectype
);
193 else if (stmt_vectype
== boolean_type_node
)
194 mask_producers
->safe_push (stmt_info
);
196 STMT_VINFO_VECTYPE (stmt_info
) = stmt_vectype
;
200 vect_update_max_nunits (vf
, nunits_vectype
);
205 /* Subroutine of vect_determine_vectorization_factor. Set the vector
206 types of STMT_INFO and all attached pattern statements and update
207 the vectorization factor VF accordingly. If some of the statements
208 produce a mask result whose vector type can only be calculated later,
209 add them to MASK_PRODUCERS. Return true on success or false if
210 something prevented vectorization. */
213 vect_determine_vf_for_stmt (stmt_vec_info stmt_info
, poly_uint64
*vf
,
214 vec
<stmt_vec_info
> *mask_producers
)
216 vec_info
*vinfo
= stmt_info
->vinfo
;
217 if (dump_enabled_p ())
219 dump_printf_loc (MSG_NOTE
, vect_location
, "==> examining statement: ");
220 dump_gimple_stmt (MSG_NOTE
, TDF_SLIM
, stmt_info
->stmt
, 0);
222 if (!vect_determine_vf_for_stmt_1 (stmt_info
, false, vf
, mask_producers
))
225 if (STMT_VINFO_IN_PATTERN_P (stmt_info
)
226 && STMT_VINFO_RELATED_STMT (stmt_info
))
228 gimple
*pattern_def_seq
= STMT_VINFO_PATTERN_DEF_SEQ (stmt_info
);
229 stmt_info
= STMT_VINFO_RELATED_STMT (stmt_info
);
231 /* If a pattern statement has def stmts, analyze them too. */
232 for (gimple_stmt_iterator si
= gsi_start (pattern_def_seq
);
233 !gsi_end_p (si
); gsi_next (&si
))
235 stmt_vec_info def_stmt_info
= vinfo
->lookup_stmt (gsi_stmt (si
));
236 if (dump_enabled_p ())
238 dump_printf_loc (MSG_NOTE
, vect_location
,
239 "==> examining pattern def stmt: ");
240 dump_gimple_stmt (MSG_NOTE
, TDF_SLIM
,
241 def_stmt_info
->stmt
, 0);
243 if (!vect_determine_vf_for_stmt_1 (def_stmt_info
, true,
248 if (dump_enabled_p ())
250 dump_printf_loc (MSG_NOTE
, vect_location
,
251 "==> examining pattern statement: ");
252 dump_gimple_stmt (MSG_NOTE
, TDF_SLIM
, stmt_info
->stmt
, 0);
254 if (!vect_determine_vf_for_stmt_1 (stmt_info
, true, vf
, mask_producers
))
261 /* Function vect_determine_vectorization_factor
263 Determine the vectorization factor (VF). VF is the number of data elements
264 that are operated upon in parallel in a single iteration of the vectorized
265 loop. For example, when vectorizing a loop that operates on 4byte elements,
266 on a target with vector size (VS) 16byte, the VF is set to 4, since 4
267 elements can fit in a single vector register.
269 We currently support vectorization of loops in which all types operated upon
270 are of the same size. Therefore this function currently sets VF according to
271 the size of the types operated upon, and fails if there are multiple sizes
274 VF is also the factor by which the loop iterations are strip-mined, e.g.:
281 for (i=0; i<N; i+=VF){
282 a[i:VF] = b[i:VF] + c[i:VF];
287 vect_determine_vectorization_factor (loop_vec_info loop_vinfo
)
289 struct loop
*loop
= LOOP_VINFO_LOOP (loop_vinfo
);
290 basic_block
*bbs
= LOOP_VINFO_BBS (loop_vinfo
);
291 unsigned nbbs
= loop
->num_nodes
;
292 poly_uint64 vectorization_factor
= 1;
293 tree scalar_type
= NULL_TREE
;
296 stmt_vec_info stmt_info
;
298 auto_vec
<stmt_vec_info
> mask_producers
;
300 DUMP_VECT_SCOPE ("vect_determine_vectorization_factor");
302 for (i
= 0; i
< nbbs
; i
++)
304 basic_block bb
= bbs
[i
];
306 for (gphi_iterator si
= gsi_start_phis (bb
); !gsi_end_p (si
);
310 stmt_info
= loop_vinfo
->lookup_stmt (phi
);
311 if (dump_enabled_p ())
313 dump_printf_loc (MSG_NOTE
, vect_location
, "==> examining phi: ");
314 dump_gimple_stmt (MSG_NOTE
, TDF_SLIM
, phi
, 0);
317 gcc_assert (stmt_info
);
319 if (STMT_VINFO_RELEVANT_P (stmt_info
)
320 || STMT_VINFO_LIVE_P (stmt_info
))
322 gcc_assert (!STMT_VINFO_VECTYPE (stmt_info
));
323 scalar_type
= TREE_TYPE (PHI_RESULT (phi
));
325 if (dump_enabled_p ())
327 dump_printf_loc (MSG_NOTE
, vect_location
,
328 "get vectype for scalar type: ");
329 dump_generic_expr (MSG_NOTE
, TDF_SLIM
, scalar_type
);
330 dump_printf (MSG_NOTE
, "\n");
333 vectype
= get_vectype_for_scalar_type (scalar_type
);
336 if (dump_enabled_p ())
338 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
339 "not vectorized: unsupported "
341 dump_generic_expr (MSG_MISSED_OPTIMIZATION
, TDF_SLIM
,
343 dump_printf (MSG_MISSED_OPTIMIZATION
, "\n");
347 STMT_VINFO_VECTYPE (stmt_info
) = vectype
;
349 if (dump_enabled_p ())
351 dump_printf_loc (MSG_NOTE
, vect_location
, "vectype: ");
352 dump_generic_expr (MSG_NOTE
, TDF_SLIM
, vectype
);
353 dump_printf (MSG_NOTE
, "\n");
356 if (dump_enabled_p ())
358 dump_printf_loc (MSG_NOTE
, vect_location
, "nunits = ");
359 dump_dec (MSG_NOTE
, TYPE_VECTOR_SUBPARTS (vectype
));
360 dump_printf (MSG_NOTE
, "\n");
363 vect_update_max_nunits (&vectorization_factor
, vectype
);
367 for (gimple_stmt_iterator si
= gsi_start_bb (bb
); !gsi_end_p (si
);
370 stmt_info
= loop_vinfo
->lookup_stmt (gsi_stmt (si
));
371 if (!vect_determine_vf_for_stmt (stmt_info
, &vectorization_factor
,
377 /* TODO: Analyze cost. Decide if worth while to vectorize. */
378 if (dump_enabled_p ())
380 dump_printf_loc (MSG_NOTE
, vect_location
, "vectorization factor = ");
381 dump_dec (MSG_NOTE
, vectorization_factor
);
382 dump_printf (MSG_NOTE
, "\n");
385 if (known_le (vectorization_factor
, 1U))
387 if (dump_enabled_p ())
388 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
389 "not vectorized: unsupported data-type\n");
392 LOOP_VINFO_VECT_FACTOR (loop_vinfo
) = vectorization_factor
;
394 for (i
= 0; i
< mask_producers
.length (); i
++)
396 stmt_info
= mask_producers
[i
];
397 tree mask_type
= vect_get_mask_type_for_stmt (stmt_info
);
400 STMT_VINFO_VECTYPE (stmt_info
) = mask_type
;
407 /* Function vect_is_simple_iv_evolution.
409 FORNOW: A simple evolution of an induction variables in the loop is
410 considered a polynomial evolution. */
413 vect_is_simple_iv_evolution (unsigned loop_nb
, tree access_fn
, tree
* init
,
418 tree evolution_part
= evolution_part_in_loop_num (access_fn
, loop_nb
);
421 /* When there is no evolution in this loop, the evolution function
423 if (evolution_part
== NULL_TREE
)
426 /* When the evolution is a polynomial of degree >= 2
427 the evolution function is not "simple". */
428 if (tree_is_chrec (evolution_part
))
431 step_expr
= evolution_part
;
432 init_expr
= unshare_expr (initial_condition_in_loop_num (access_fn
, loop_nb
));
434 if (dump_enabled_p ())
436 dump_printf_loc (MSG_NOTE
, vect_location
, "step: ");
437 dump_generic_expr (MSG_NOTE
, TDF_SLIM
, step_expr
);
438 dump_printf (MSG_NOTE
, ", init: ");
439 dump_generic_expr (MSG_NOTE
, TDF_SLIM
, init_expr
);
440 dump_printf (MSG_NOTE
, "\n");
446 if (TREE_CODE (step_expr
) != INTEGER_CST
447 && (TREE_CODE (step_expr
) != SSA_NAME
448 || ((bb
= gimple_bb (SSA_NAME_DEF_STMT (step_expr
)))
449 && flow_bb_inside_loop_p (get_loop (cfun
, loop_nb
), bb
))
450 || (!INTEGRAL_TYPE_P (TREE_TYPE (step_expr
))
451 && (!SCALAR_FLOAT_TYPE_P (TREE_TYPE (step_expr
))
452 || !flag_associative_math
)))
453 && (TREE_CODE (step_expr
) != REAL_CST
454 || !flag_associative_math
))
456 if (dump_enabled_p ())
457 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
465 /* Function vect_analyze_scalar_cycles_1.
467 Examine the cross iteration def-use cycles of scalar variables
468 in LOOP. LOOP_VINFO represents the loop that is now being
469 considered for vectorization (can be LOOP, or an outer-loop
473 vect_analyze_scalar_cycles_1 (loop_vec_info loop_vinfo
, struct loop
*loop
)
475 basic_block bb
= loop
->header
;
477 auto_vec
<gimple
*, 64> worklist
;
481 DUMP_VECT_SCOPE ("vect_analyze_scalar_cycles");
483 /* First - identify all inductions. Reduction detection assumes that all the
484 inductions have been identified, therefore, this order must not be
486 for (gsi
= gsi_start_phis (bb
); !gsi_end_p (gsi
); gsi_next (&gsi
))
488 gphi
*phi
= gsi
.phi ();
489 tree access_fn
= NULL
;
490 tree def
= PHI_RESULT (phi
);
491 stmt_vec_info stmt_vinfo
= loop_vinfo
->lookup_stmt (phi
);
493 if (dump_enabled_p ())
495 dump_printf_loc (MSG_NOTE
, vect_location
, "Analyze phi: ");
496 dump_gimple_stmt (MSG_NOTE
, TDF_SLIM
, phi
, 0);
499 /* Skip virtual phi's. The data dependences that are associated with
500 virtual defs/uses (i.e., memory accesses) are analyzed elsewhere. */
501 if (virtual_operand_p (def
))
504 STMT_VINFO_DEF_TYPE (stmt_vinfo
) = vect_unknown_def_type
;
506 /* Analyze the evolution function. */
507 access_fn
= analyze_scalar_evolution (loop
, def
);
510 STRIP_NOPS (access_fn
);
511 if (dump_enabled_p ())
513 dump_printf_loc (MSG_NOTE
, vect_location
,
514 "Access function of PHI: ");
515 dump_generic_expr (MSG_NOTE
, TDF_SLIM
, access_fn
);
516 dump_printf (MSG_NOTE
, "\n");
518 STMT_VINFO_LOOP_PHI_EVOLUTION_BASE_UNCHANGED (stmt_vinfo
)
519 = initial_condition_in_loop_num (access_fn
, loop
->num
);
520 STMT_VINFO_LOOP_PHI_EVOLUTION_PART (stmt_vinfo
)
521 = evolution_part_in_loop_num (access_fn
, loop
->num
);
525 || !vect_is_simple_iv_evolution (loop
->num
, access_fn
, &init
, &step
)
526 || (LOOP_VINFO_LOOP (loop_vinfo
) != loop
527 && TREE_CODE (step
) != INTEGER_CST
))
529 worklist
.safe_push (phi
);
533 gcc_assert (STMT_VINFO_LOOP_PHI_EVOLUTION_BASE_UNCHANGED (stmt_vinfo
)
535 gcc_assert (STMT_VINFO_LOOP_PHI_EVOLUTION_PART (stmt_vinfo
) != NULL_TREE
);
537 if (dump_enabled_p ())
538 dump_printf_loc (MSG_NOTE
, vect_location
, "Detected induction.\n");
539 STMT_VINFO_DEF_TYPE (stmt_vinfo
) = vect_induction_def
;
543 /* Second - identify all reductions and nested cycles. */
544 while (worklist
.length () > 0)
546 gimple
*phi
= worklist
.pop ();
547 tree def
= PHI_RESULT (phi
);
548 stmt_vec_info stmt_vinfo
= vinfo_for_stmt (phi
);
550 if (dump_enabled_p ())
552 dump_printf_loc (MSG_NOTE
, vect_location
, "Analyze phi: ");
553 dump_gimple_stmt (MSG_NOTE
, TDF_SLIM
, phi
, 0);
556 gcc_assert (!virtual_operand_p (def
)
557 && STMT_VINFO_DEF_TYPE (stmt_vinfo
) == vect_unknown_def_type
);
559 stmt_vec_info reduc_stmt_info
560 = vect_force_simple_reduction (loop_vinfo
, stmt_vinfo
,
561 &double_reduc
, false);
566 if (dump_enabled_p ())
567 dump_printf_loc (MSG_NOTE
, vect_location
,
568 "Detected double reduction.\n");
570 STMT_VINFO_DEF_TYPE (stmt_vinfo
) = vect_double_reduction_def
;
571 STMT_VINFO_DEF_TYPE (reduc_stmt_info
)
572 = vect_double_reduction_def
;
576 if (loop
!= LOOP_VINFO_LOOP (loop_vinfo
))
578 if (dump_enabled_p ())
579 dump_printf_loc (MSG_NOTE
, vect_location
,
580 "Detected vectorizable nested cycle.\n");
582 STMT_VINFO_DEF_TYPE (stmt_vinfo
) = vect_nested_cycle
;
583 STMT_VINFO_DEF_TYPE (reduc_stmt_info
) = vect_nested_cycle
;
587 if (dump_enabled_p ())
588 dump_printf_loc (MSG_NOTE
, vect_location
,
589 "Detected reduction.\n");
591 STMT_VINFO_DEF_TYPE (stmt_vinfo
) = vect_reduction_def
;
592 STMT_VINFO_DEF_TYPE (reduc_stmt_info
) = vect_reduction_def
;
593 /* Store the reduction cycles for possible vectorization in
594 loop-aware SLP if it was not detected as reduction
596 if (! REDUC_GROUP_FIRST_ELEMENT (reduc_stmt_info
))
597 LOOP_VINFO_REDUCTIONS (loop_vinfo
).safe_push
603 if (dump_enabled_p ())
604 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
605 "Unknown def-use cycle pattern.\n");
610 /* Function vect_analyze_scalar_cycles.
612 Examine the cross iteration def-use cycles of scalar variables, by
613 analyzing the loop-header PHIs of scalar variables. Classify each
614 cycle as one of the following: invariant, induction, reduction, unknown.
615 We do that for the loop represented by LOOP_VINFO, and also to its
616 inner-loop, if exists.
617 Examples for scalar cycles:
632 vect_analyze_scalar_cycles (loop_vec_info loop_vinfo
)
634 struct loop
*loop
= LOOP_VINFO_LOOP (loop_vinfo
);
636 vect_analyze_scalar_cycles_1 (loop_vinfo
, loop
);
638 /* When vectorizing an outer-loop, the inner-loop is executed sequentially.
639 Reductions in such inner-loop therefore have different properties than
640 the reductions in the nest that gets vectorized:
641 1. When vectorized, they are executed in the same order as in the original
642 scalar loop, so we can't change the order of computation when
644 2. FIXME: Inner-loop reductions can be used in the inner-loop, so the
645 current checks are too strict. */
648 vect_analyze_scalar_cycles_1 (loop_vinfo
, loop
->inner
);
651 /* Transfer group and reduction information from STMT to its pattern stmt. */
654 vect_fixup_reduc_chain (gimple
*stmt
)
656 stmt_vec_info stmt_info
= vinfo_for_stmt (stmt
);
657 stmt_vec_info firstp
= STMT_VINFO_RELATED_STMT (stmt_info
);
659 gcc_assert (!REDUC_GROUP_FIRST_ELEMENT (firstp
)
660 && REDUC_GROUP_FIRST_ELEMENT (stmt_info
));
661 REDUC_GROUP_SIZE (firstp
) = REDUC_GROUP_SIZE (stmt_info
);
664 stmtp
= STMT_VINFO_RELATED_STMT (stmt_info
);
665 REDUC_GROUP_FIRST_ELEMENT (stmtp
) = firstp
;
666 stmt_info
= REDUC_GROUP_NEXT_ELEMENT (stmt_info
);
668 REDUC_GROUP_NEXT_ELEMENT (stmtp
)
669 = STMT_VINFO_RELATED_STMT (stmt_info
);
672 STMT_VINFO_DEF_TYPE (stmtp
) = vect_reduction_def
;
675 /* Fixup scalar cycles that now have their stmts detected as patterns. */
678 vect_fixup_scalar_cycles_with_patterns (loop_vec_info loop_vinfo
)
683 FOR_EACH_VEC_ELT (LOOP_VINFO_REDUCTION_CHAINS (loop_vinfo
), i
, first
)
684 if (STMT_VINFO_IN_PATTERN_P (first
))
686 stmt_vec_info next
= REDUC_GROUP_NEXT_ELEMENT (first
);
689 if (! STMT_VINFO_IN_PATTERN_P (next
))
691 next
= REDUC_GROUP_NEXT_ELEMENT (next
);
693 /* If not all stmt in the chain are patterns try to handle
694 the chain without patterns. */
697 vect_fixup_reduc_chain (first
);
698 LOOP_VINFO_REDUCTION_CHAINS (loop_vinfo
)[i
]
699 = STMT_VINFO_RELATED_STMT (first
);
704 /* Function vect_get_loop_niters.
706 Determine how many iterations the loop is executed and place it
707 in NUMBER_OF_ITERATIONS. Place the number of latch iterations
708 in NUMBER_OF_ITERATIONSM1. Place the condition under which the
709 niter information holds in ASSUMPTIONS.
711 Return the loop exit condition. */
715 vect_get_loop_niters (struct loop
*loop
, tree
*assumptions
,
716 tree
*number_of_iterations
, tree
*number_of_iterationsm1
)
718 edge exit
= single_exit (loop
);
719 struct tree_niter_desc niter_desc
;
720 tree niter_assumptions
, niter
, may_be_zero
;
721 gcond
*cond
= get_loop_exit_condition (loop
);
723 *assumptions
= boolean_true_node
;
724 *number_of_iterationsm1
= chrec_dont_know
;
725 *number_of_iterations
= chrec_dont_know
;
726 DUMP_VECT_SCOPE ("get_loop_niters");
731 niter
= chrec_dont_know
;
732 may_be_zero
= NULL_TREE
;
733 niter_assumptions
= boolean_true_node
;
734 if (!number_of_iterations_exit_assumptions (loop
, exit
, &niter_desc
, NULL
)
735 || chrec_contains_undetermined (niter_desc
.niter
))
738 niter_assumptions
= niter_desc
.assumptions
;
739 may_be_zero
= niter_desc
.may_be_zero
;
740 niter
= niter_desc
.niter
;
742 if (may_be_zero
&& integer_zerop (may_be_zero
))
743 may_be_zero
= NULL_TREE
;
747 if (COMPARISON_CLASS_P (may_be_zero
))
749 /* Try to combine may_be_zero with assumptions, this can simplify
750 computation of niter expression. */
751 if (niter_assumptions
&& !integer_nonzerop (niter_assumptions
))
752 niter_assumptions
= fold_build2 (TRUTH_AND_EXPR
, boolean_type_node
,
754 fold_build1 (TRUTH_NOT_EXPR
,
758 niter
= fold_build3 (COND_EXPR
, TREE_TYPE (niter
), may_be_zero
,
759 build_int_cst (TREE_TYPE (niter
), 0),
760 rewrite_to_non_trapping_overflow (niter
));
762 may_be_zero
= NULL_TREE
;
764 else if (integer_nonzerop (may_be_zero
))
766 *number_of_iterationsm1
= build_int_cst (TREE_TYPE (niter
), 0);
767 *number_of_iterations
= build_int_cst (TREE_TYPE (niter
), 1);
774 *assumptions
= niter_assumptions
;
775 *number_of_iterationsm1
= niter
;
777 /* We want the number of loop header executions which is the number
778 of latch executions plus one.
779 ??? For UINT_MAX latch executions this number overflows to zero
780 for loops like do { n++; } while (n != 0); */
781 if (niter
&& !chrec_contains_undetermined (niter
))
782 niter
= fold_build2 (PLUS_EXPR
, TREE_TYPE (niter
), unshare_expr (niter
),
783 build_int_cst (TREE_TYPE (niter
), 1));
784 *number_of_iterations
= niter
;
789 /* Function bb_in_loop_p
791 Used as predicate for dfs order traversal of the loop bbs. */
794 bb_in_loop_p (const_basic_block bb
, const void *data
)
796 const struct loop
*const loop
= (const struct loop
*)data
;
797 if (flow_bb_inside_loop_p (loop
, bb
))
803 /* Create and initialize a new loop_vec_info struct for LOOP_IN, as well as
804 stmt_vec_info structs for all the stmts in LOOP_IN. */
806 _loop_vec_info::_loop_vec_info (struct loop
*loop_in
, vec_info_shared
*shared
)
807 : vec_info (vec_info::loop
, init_cost (loop_in
), shared
),
809 bbs (XCNEWVEC (basic_block
, loop
->num_nodes
)),
810 num_itersm1 (NULL_TREE
),
811 num_iters (NULL_TREE
),
812 num_iters_unchanged (NULL_TREE
),
813 num_iters_assumptions (NULL_TREE
),
815 versioning_threshold (0),
816 vectorization_factor (0),
817 max_vectorization_factor (0),
818 mask_skip_niters (NULL_TREE
),
819 mask_compare_type (NULL_TREE
),
821 peeling_for_alignment (0),
824 slp_unrolling_factor (1),
825 single_scalar_iteration_cost (0),
826 vectorizable (false),
827 can_fully_mask_p (true),
828 fully_masked_p (false),
829 peeling_for_gaps (false),
830 peeling_for_niter (false),
831 operands_swapped (false),
832 no_data_dependencies (false),
833 has_mask_store (false),
835 orig_loop_info (NULL
)
837 /* Create/Update stmt_info for all stmts in the loop. */
838 basic_block
*body
= get_loop_body (loop
);
839 for (unsigned int i
= 0; i
< loop
->num_nodes
; i
++)
841 basic_block bb
= body
[i
];
842 gimple_stmt_iterator si
;
844 for (si
= gsi_start_phis (bb
); !gsi_end_p (si
); gsi_next (&si
))
846 gimple
*phi
= gsi_stmt (si
);
847 gimple_set_uid (phi
, 0);
851 for (si
= gsi_start_bb (bb
); !gsi_end_p (si
); gsi_next (&si
))
853 gimple
*stmt
= gsi_stmt (si
);
854 gimple_set_uid (stmt
, 0);
860 /* CHECKME: We want to visit all BBs before their successors (except for
861 latch blocks, for which this assertion wouldn't hold). In the simple
862 case of the loop forms we allow, a dfs order of the BBs would the same
863 as reversed postorder traversal, so we are safe. */
865 unsigned int nbbs
= dfs_enumerate_from (loop
->header
, 0, bb_in_loop_p
,
866 bbs
, loop
->num_nodes
, loop
);
867 gcc_assert (nbbs
== loop
->num_nodes
);
870 /* Free all levels of MASKS. */
873 release_vec_loop_masks (vec_loop_masks
*masks
)
877 FOR_EACH_VEC_ELT (*masks
, i
, rgm
)
878 rgm
->masks
.release ();
882 /* Free all memory used by the _loop_vec_info, as well as all the
883 stmt_vec_info structs of all the stmts in the loop. */
885 _loop_vec_info::~_loop_vec_info ()
888 gimple_stmt_iterator si
;
891 /* ??? We're releasing loop_vinfos en-block. */
892 set_stmt_vec_info_vec (&stmt_vec_infos
);
893 nbbs
= loop
->num_nodes
;
894 for (j
= 0; j
< nbbs
; j
++)
896 basic_block bb
= bbs
[j
];
897 for (si
= gsi_start_phis (bb
); !gsi_end_p (si
); gsi_next (&si
))
898 free_stmt_vec_info (gsi_stmt (si
));
900 for (si
= gsi_start_bb (bb
); !gsi_end_p (si
); )
902 gimple
*stmt
= gsi_stmt (si
);
904 /* We may have broken canonical form by moving a constant
905 into RHS1 of a commutative op. Fix such occurrences. */
906 if (operands_swapped
&& is_gimple_assign (stmt
))
908 enum tree_code code
= gimple_assign_rhs_code (stmt
);
910 if ((code
== PLUS_EXPR
911 || code
== POINTER_PLUS_EXPR
912 || code
== MULT_EXPR
)
913 && CONSTANT_CLASS_P (gimple_assign_rhs1 (stmt
)))
914 swap_ssa_operands (stmt
,
915 gimple_assign_rhs1_ptr (stmt
),
916 gimple_assign_rhs2_ptr (stmt
));
917 else if (code
== COND_EXPR
918 && CONSTANT_CLASS_P (gimple_assign_rhs2 (stmt
)))
920 tree cond_expr
= gimple_assign_rhs1 (stmt
);
921 enum tree_code cond_code
= TREE_CODE (cond_expr
);
923 if (TREE_CODE_CLASS (cond_code
) == tcc_comparison
)
925 bool honor_nans
= HONOR_NANS (TREE_OPERAND (cond_expr
,
927 cond_code
= invert_tree_comparison (cond_code
,
929 if (cond_code
!= ERROR_MARK
)
931 TREE_SET_CODE (cond_expr
, cond_code
);
932 swap_ssa_operands (stmt
,
933 gimple_assign_rhs2_ptr (stmt
),
934 gimple_assign_rhs3_ptr (stmt
));
940 /* Free stmt_vec_info. */
941 free_stmt_vec_info (stmt
);
948 release_vec_loop_masks (&masks
);
954 /* Return an invariant or register for EXPR and emit necessary
955 computations in the LOOP_VINFO loop preheader. */
958 cse_and_gimplify_to_preheader (loop_vec_info loop_vinfo
, tree expr
)
960 if (is_gimple_reg (expr
)
961 || is_gimple_min_invariant (expr
))
964 if (! loop_vinfo
->ivexpr_map
)
965 loop_vinfo
->ivexpr_map
= new hash_map
<tree_operand_hash
, tree
>;
966 tree
&cached
= loop_vinfo
->ivexpr_map
->get_or_insert (expr
);
969 gimple_seq stmts
= NULL
;
970 cached
= force_gimple_operand (unshare_expr (expr
),
971 &stmts
, true, NULL_TREE
);
974 edge e
= loop_preheader_edge (LOOP_VINFO_LOOP (loop_vinfo
));
975 gsi_insert_seq_on_edge_immediate (e
, stmts
);
981 /* Return true if we can use CMP_TYPE as the comparison type to produce
982 all masks required to mask LOOP_VINFO. */
985 can_produce_all_loop_masks_p (loop_vec_info loop_vinfo
, tree cmp_type
)
989 FOR_EACH_VEC_ELT (LOOP_VINFO_MASKS (loop_vinfo
), i
, rgm
)
990 if (rgm
->mask_type
!= NULL_TREE
991 && !direct_internal_fn_supported_p (IFN_WHILE_ULT
,
992 cmp_type
, rgm
->mask_type
,
998 /* Calculate the maximum number of scalars per iteration for every
999 rgroup in LOOP_VINFO. */
1002 vect_get_max_nscalars_per_iter (loop_vec_info loop_vinfo
)
1004 unsigned int res
= 1;
1007 FOR_EACH_VEC_ELT (LOOP_VINFO_MASKS (loop_vinfo
), i
, rgm
)
1008 res
= MAX (res
, rgm
->max_nscalars_per_iter
);
1012 /* Each statement in LOOP_VINFO can be masked where necessary. Check
1013 whether we can actually generate the masks required. Return true if so,
1014 storing the type of the scalar IV in LOOP_VINFO_MASK_COMPARE_TYPE. */
1017 vect_verify_full_masking (loop_vec_info loop_vinfo
)
1019 struct loop
*loop
= LOOP_VINFO_LOOP (loop_vinfo
);
1020 unsigned int min_ni_width
;
1022 /* Use a normal loop if there are no statements that need masking.
1023 This only happens in rare degenerate cases: it means that the loop
1024 has no loads, no stores, and no live-out values. */
1025 if (LOOP_VINFO_MASKS (loop_vinfo
).is_empty ())
1028 /* Get the maximum number of iterations that is representable
1029 in the counter type. */
1030 tree ni_type
= TREE_TYPE (LOOP_VINFO_NITERSM1 (loop_vinfo
));
1031 widest_int max_ni
= wi::to_widest (TYPE_MAX_VALUE (ni_type
)) + 1;
1033 /* Get a more refined estimate for the number of iterations. */
1034 widest_int max_back_edges
;
1035 if (max_loop_iterations (loop
, &max_back_edges
))
1036 max_ni
= wi::smin (max_ni
, max_back_edges
+ 1);
1038 /* Account for rgroup masks, in which each bit is replicated N times. */
1039 max_ni
*= vect_get_max_nscalars_per_iter (loop_vinfo
);
1041 /* Work out how many bits we need to represent the limit. */
1042 min_ni_width
= wi::min_precision (max_ni
, UNSIGNED
);
1044 /* Find a scalar mode for which WHILE_ULT is supported. */
1045 opt_scalar_int_mode cmp_mode_iter
;
1046 tree cmp_type
= NULL_TREE
;
1047 FOR_EACH_MODE_IN_CLASS (cmp_mode_iter
, MODE_INT
)
1049 unsigned int cmp_bits
= GET_MODE_BITSIZE (cmp_mode_iter
.require ());
1050 if (cmp_bits
>= min_ni_width
1051 && targetm
.scalar_mode_supported_p (cmp_mode_iter
.require ()))
1053 tree this_type
= build_nonstandard_integer_type (cmp_bits
, true);
1055 && can_produce_all_loop_masks_p (loop_vinfo
, this_type
))
1057 /* Although we could stop as soon as we find a valid mode,
1058 it's often better to continue until we hit Pmode, since the
1059 operands to the WHILE are more likely to be reusable in
1060 address calculations. */
1061 cmp_type
= this_type
;
1062 if (cmp_bits
>= GET_MODE_BITSIZE (Pmode
))
1071 LOOP_VINFO_MASK_COMPARE_TYPE (loop_vinfo
) = cmp_type
;
1075 /* Calculate the cost of one scalar iteration of the loop. */
1077 vect_compute_single_scalar_iteration_cost (loop_vec_info loop_vinfo
)
1079 struct loop
*loop
= LOOP_VINFO_LOOP (loop_vinfo
);
1080 basic_block
*bbs
= LOOP_VINFO_BBS (loop_vinfo
);
1081 int nbbs
= loop
->num_nodes
, factor
;
1082 int innerloop_iters
, i
;
1084 /* Gather costs for statements in the scalar loop. */
1087 innerloop_iters
= 1;
1089 innerloop_iters
= 50; /* FIXME */
1091 for (i
= 0; i
< nbbs
; i
++)
1093 gimple_stmt_iterator si
;
1094 basic_block bb
= bbs
[i
];
1096 if (bb
->loop_father
== loop
->inner
)
1097 factor
= innerloop_iters
;
1101 for (si
= gsi_start_bb (bb
); !gsi_end_p (si
); gsi_next (&si
))
1103 gimple
*stmt
= gsi_stmt (si
);
1104 stmt_vec_info stmt_info
= loop_vinfo
->lookup_stmt (stmt
);
1106 if (!is_gimple_assign (stmt
) && !is_gimple_call (stmt
))
1109 /* Skip stmts that are not vectorized inside the loop. */
1111 && !STMT_VINFO_RELEVANT_P (stmt_info
)
1112 && (!STMT_VINFO_LIVE_P (stmt_info
)
1113 || !VECTORIZABLE_CYCLE_DEF (STMT_VINFO_DEF_TYPE (stmt_info
)))
1114 && !STMT_VINFO_IN_PATTERN_P (stmt_info
))
1117 vect_cost_for_stmt kind
;
1118 if (STMT_VINFO_DATA_REF (stmt_info
))
1120 if (DR_IS_READ (STMT_VINFO_DATA_REF (stmt_info
)))
1123 kind
= scalar_store
;
1128 record_stmt_cost (&LOOP_VINFO_SCALAR_ITERATION_COST (loop_vinfo
),
1129 factor
, kind
, stmt_info
, 0, vect_prologue
);
1133 /* Now accumulate cost. */
1134 void *target_cost_data
= init_cost (loop
);
1135 stmt_info_for_cost
*si
;
1137 FOR_EACH_VEC_ELT (LOOP_VINFO_SCALAR_ITERATION_COST (loop_vinfo
),
1140 struct _stmt_vec_info
*stmt_info
1141 = si
->stmt
? vinfo_for_stmt (si
->stmt
) : NULL_STMT_VEC_INFO
;
1142 (void) add_stmt_cost (target_cost_data
, si
->count
,
1143 si
->kind
, stmt_info
, si
->misalign
,
1146 unsigned dummy
, body_cost
= 0;
1147 finish_cost (target_cost_data
, &dummy
, &body_cost
, &dummy
);
1148 destroy_cost_data (target_cost_data
);
1149 LOOP_VINFO_SINGLE_SCALAR_ITERATION_COST (loop_vinfo
) = body_cost
;
1153 /* Function vect_analyze_loop_form_1.
1155 Verify that certain CFG restrictions hold, including:
1156 - the loop has a pre-header
1157 - the loop has a single entry and exit
1158 - the loop exit condition is simple enough
1159 - the number of iterations can be analyzed, i.e, a countable loop. The
1160 niter could be analyzed under some assumptions. */
1163 vect_analyze_loop_form_1 (struct loop
*loop
, gcond
**loop_cond
,
1164 tree
*assumptions
, tree
*number_of_iterationsm1
,
1165 tree
*number_of_iterations
, gcond
**inner_loop_cond
)
1167 DUMP_VECT_SCOPE ("vect_analyze_loop_form");
1169 /* Different restrictions apply when we are considering an inner-most loop,
1170 vs. an outer (nested) loop.
1171 (FORNOW. May want to relax some of these restrictions in the future). */
1175 /* Inner-most loop. We currently require that the number of BBs is
1176 exactly 2 (the header and latch). Vectorizable inner-most loops
1187 if (loop
->num_nodes
!= 2)
1189 if (dump_enabled_p ())
1190 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1191 "not vectorized: control flow in loop.\n");
1195 if (empty_block_p (loop
->header
))
1197 if (dump_enabled_p ())
1198 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1199 "not vectorized: empty loop.\n");
1205 struct loop
*innerloop
= loop
->inner
;
1208 /* Nested loop. We currently require that the loop is doubly-nested,
1209 contains a single inner loop, and the number of BBs is exactly 5.
1210 Vectorizable outer-loops look like this:
1222 The inner-loop has the properties expected of inner-most loops
1223 as described above. */
1225 if ((loop
->inner
)->inner
|| (loop
->inner
)->next
)
1227 if (dump_enabled_p ())
1228 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1229 "not vectorized: multiple nested loops.\n");
1233 if (loop
->num_nodes
!= 5)
1235 if (dump_enabled_p ())
1236 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1237 "not vectorized: control flow in loop.\n");
1241 entryedge
= loop_preheader_edge (innerloop
);
1242 if (entryedge
->src
!= loop
->header
1243 || !single_exit (innerloop
)
1244 || single_exit (innerloop
)->dest
!= EDGE_PRED (loop
->latch
, 0)->src
)
1246 if (dump_enabled_p ())
1247 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1248 "not vectorized: unsupported outerloop form.\n");
1252 /* Analyze the inner-loop. */
1253 tree inner_niterm1
, inner_niter
, inner_assumptions
;
1254 if (! vect_analyze_loop_form_1 (loop
->inner
, inner_loop_cond
,
1255 &inner_assumptions
, &inner_niterm1
,
1257 /* Don't support analyzing niter under assumptions for inner
1259 || !integer_onep (inner_assumptions
))
1261 if (dump_enabled_p ())
1262 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1263 "not vectorized: Bad inner loop.\n");
1267 if (!expr_invariant_in_loop_p (loop
, inner_niter
))
1269 if (dump_enabled_p ())
1270 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1271 "not vectorized: inner-loop count not"
1276 if (dump_enabled_p ())
1277 dump_printf_loc (MSG_NOTE
, vect_location
,
1278 "Considering outer-loop vectorization.\n");
1281 if (!single_exit (loop
)
1282 || EDGE_COUNT (loop
->header
->preds
) != 2)
1284 if (dump_enabled_p ())
1286 if (!single_exit (loop
))
1287 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1288 "not vectorized: multiple exits.\n");
1289 else if (EDGE_COUNT (loop
->header
->preds
) != 2)
1290 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1291 "not vectorized: too many incoming edges.\n");
1296 /* We assume that the loop exit condition is at the end of the loop. i.e,
1297 that the loop is represented as a do-while (with a proper if-guard
1298 before the loop if needed), where the loop header contains all the
1299 executable statements, and the latch is empty. */
1300 if (!empty_block_p (loop
->latch
)
1301 || !gimple_seq_empty_p (phi_nodes (loop
->latch
)))
1303 if (dump_enabled_p ())
1304 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1305 "not vectorized: latch block not empty.\n");
1309 /* Make sure the exit is not abnormal. */
1310 edge e
= single_exit (loop
);
1311 if (e
->flags
& EDGE_ABNORMAL
)
1313 if (dump_enabled_p ())
1314 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1315 "not vectorized: abnormal loop exit edge.\n");
1319 *loop_cond
= vect_get_loop_niters (loop
, assumptions
, number_of_iterations
,
1320 number_of_iterationsm1
);
1323 if (dump_enabled_p ())
1324 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1325 "not vectorized: complicated exit condition.\n");
1329 if (integer_zerop (*assumptions
)
1330 || !*number_of_iterations
1331 || chrec_contains_undetermined (*number_of_iterations
))
1333 if (dump_enabled_p ())
1334 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1335 "not vectorized: number of iterations cannot be "
1340 if (integer_zerop (*number_of_iterations
))
1342 if (dump_enabled_p ())
1343 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1344 "not vectorized: number of iterations = 0.\n");
1351 /* Analyze LOOP form and return a loop_vec_info if it is of suitable form. */
1354 vect_analyze_loop_form (struct loop
*loop
, vec_info_shared
*shared
)
1356 tree assumptions
, number_of_iterations
, number_of_iterationsm1
;
1357 gcond
*loop_cond
, *inner_loop_cond
= NULL
;
1359 if (! vect_analyze_loop_form_1 (loop
, &loop_cond
,
1360 &assumptions
, &number_of_iterationsm1
,
1361 &number_of_iterations
, &inner_loop_cond
))
1364 loop_vec_info loop_vinfo
= new _loop_vec_info (loop
, shared
);
1365 LOOP_VINFO_NITERSM1 (loop_vinfo
) = number_of_iterationsm1
;
1366 LOOP_VINFO_NITERS (loop_vinfo
) = number_of_iterations
;
1367 LOOP_VINFO_NITERS_UNCHANGED (loop_vinfo
) = number_of_iterations
;
1368 if (!integer_onep (assumptions
))
1370 /* We consider to vectorize this loop by versioning it under
1371 some assumptions. In order to do this, we need to clear
1372 existing information computed by scev and niter analyzer. */
1374 free_numbers_of_iterations_estimates (loop
);
1375 /* Also set flag for this loop so that following scev and niter
1376 analysis are done under the assumptions. */
1377 loop_constraint_set (loop
, LOOP_C_FINITE
);
1378 /* Also record the assumptions for versioning. */
1379 LOOP_VINFO_NITERS_ASSUMPTIONS (loop_vinfo
) = assumptions
;
1382 if (!LOOP_VINFO_NITERS_KNOWN_P (loop_vinfo
))
1384 if (dump_enabled_p ())
1386 dump_printf_loc (MSG_NOTE
, vect_location
,
1387 "Symbolic number of iterations is ");
1388 dump_generic_expr (MSG_NOTE
, TDF_DETAILS
, number_of_iterations
);
1389 dump_printf (MSG_NOTE
, "\n");
1393 stmt_vec_info loop_cond_info
= loop_vinfo
->lookup_stmt (loop_cond
);
1394 STMT_VINFO_TYPE (loop_cond_info
) = loop_exit_ctrl_vec_info_type
;
1395 if (inner_loop_cond
)
1397 stmt_vec_info inner_loop_cond_info
1398 = loop_vinfo
->lookup_stmt (inner_loop_cond
);
1399 STMT_VINFO_TYPE (inner_loop_cond_info
) = loop_exit_ctrl_vec_info_type
;
1402 gcc_assert (!loop
->aux
);
1403 loop
->aux
= loop_vinfo
;
1409 /* Scan the loop stmts and dependent on whether there are any (non-)SLP
1410 statements update the vectorization factor. */
1413 vect_update_vf_for_slp (loop_vec_info loop_vinfo
)
1415 struct loop
*loop
= LOOP_VINFO_LOOP (loop_vinfo
);
1416 basic_block
*bbs
= LOOP_VINFO_BBS (loop_vinfo
);
1417 int nbbs
= loop
->num_nodes
;
1418 poly_uint64 vectorization_factor
;
1421 DUMP_VECT_SCOPE ("vect_update_vf_for_slp");
1423 vectorization_factor
= LOOP_VINFO_VECT_FACTOR (loop_vinfo
);
1424 gcc_assert (known_ne (vectorization_factor
, 0U));
1426 /* If all the stmts in the loop can be SLPed, we perform only SLP, and
1427 vectorization factor of the loop is the unrolling factor required by
1428 the SLP instances. If that unrolling factor is 1, we say, that we
1429 perform pure SLP on loop - cross iteration parallelism is not
1431 bool only_slp_in_loop
= true;
1432 for (i
= 0; i
< nbbs
; i
++)
1434 basic_block bb
= bbs
[i
];
1435 for (gimple_stmt_iterator si
= gsi_start_bb (bb
); !gsi_end_p (si
);
1438 stmt_vec_info stmt_info
= loop_vinfo
->lookup_stmt (gsi_stmt (si
));
1439 if (STMT_VINFO_IN_PATTERN_P (stmt_info
)
1440 && STMT_VINFO_RELATED_STMT (stmt_info
))
1441 stmt_info
= STMT_VINFO_RELATED_STMT (stmt_info
);
1442 if ((STMT_VINFO_RELEVANT_P (stmt_info
)
1443 || VECTORIZABLE_CYCLE_DEF (STMT_VINFO_DEF_TYPE (stmt_info
)))
1444 && !PURE_SLP_STMT (stmt_info
))
1445 /* STMT needs both SLP and loop-based vectorization. */
1446 only_slp_in_loop
= false;
1450 if (only_slp_in_loop
)
1452 dump_printf_loc (MSG_NOTE
, vect_location
,
1453 "Loop contains only SLP stmts\n");
1454 vectorization_factor
= LOOP_VINFO_SLP_UNROLLING_FACTOR (loop_vinfo
);
1458 dump_printf_loc (MSG_NOTE
, vect_location
,
1459 "Loop contains SLP and non-SLP stmts\n");
1460 /* Both the vectorization factor and unroll factor have the form
1461 current_vector_size * X for some rational X, so they must have
1462 a common multiple. */
1463 vectorization_factor
1464 = force_common_multiple (vectorization_factor
,
1465 LOOP_VINFO_SLP_UNROLLING_FACTOR (loop_vinfo
));
1468 LOOP_VINFO_VECT_FACTOR (loop_vinfo
) = vectorization_factor
;
1469 if (dump_enabled_p ())
1471 dump_printf_loc (MSG_NOTE
, vect_location
,
1472 "Updating vectorization factor to ");
1473 dump_dec (MSG_NOTE
, vectorization_factor
);
1474 dump_printf (MSG_NOTE
, ".\n");
1478 /* Return true if STMT_INFO describes a double reduction phi and if
1479 the other phi in the reduction is also relevant for vectorization.
1480 This rejects cases such as:
1483 x_1 = PHI <x_3(outer2), ...>;
1491 x_3 = PHI <x_2(inner)>;
1493 if nothing in x_2 or elsewhere makes x_1 relevant. */
1496 vect_active_double_reduction_p (stmt_vec_info stmt_info
)
1498 if (STMT_VINFO_DEF_TYPE (stmt_info
) != vect_double_reduction_def
)
1501 return STMT_VINFO_RELEVANT_P (STMT_VINFO_REDUC_DEF (stmt_info
));
1504 /* Function vect_analyze_loop_operations.
1506 Scan the loop stmts and make sure they are all vectorizable. */
1509 vect_analyze_loop_operations (loop_vec_info loop_vinfo
)
1511 struct loop
*loop
= LOOP_VINFO_LOOP (loop_vinfo
);
1512 basic_block
*bbs
= LOOP_VINFO_BBS (loop_vinfo
);
1513 int nbbs
= loop
->num_nodes
;
1515 stmt_vec_info stmt_info
;
1516 bool need_to_vectorize
= false;
1519 DUMP_VECT_SCOPE ("vect_analyze_loop_operations");
1521 stmt_vector_for_cost cost_vec
;
1522 cost_vec
.create (2);
1524 for (i
= 0; i
< nbbs
; i
++)
1526 basic_block bb
= bbs
[i
];
1528 for (gphi_iterator si
= gsi_start_phis (bb
); !gsi_end_p (si
);
1531 gphi
*phi
= si
.phi ();
1534 stmt_info
= loop_vinfo
->lookup_stmt (phi
);
1535 if (dump_enabled_p ())
1537 dump_printf_loc (MSG_NOTE
, vect_location
, "examining phi: ");
1538 dump_gimple_stmt (MSG_NOTE
, TDF_SLIM
, phi
, 0);
1540 if (virtual_operand_p (gimple_phi_result (phi
)))
1543 /* Inner-loop loop-closed exit phi in outer-loop vectorization
1544 (i.e., a phi in the tail of the outer-loop). */
1545 if (! is_loop_header_bb_p (bb
))
1547 /* FORNOW: we currently don't support the case that these phis
1548 are not used in the outerloop (unless it is double reduction,
1549 i.e., this phi is vect_reduction_def), cause this case
1550 requires to actually do something here. */
1551 if (STMT_VINFO_LIVE_P (stmt_info
)
1552 && !vect_active_double_reduction_p (stmt_info
))
1554 if (dump_enabled_p ())
1555 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1556 "Unsupported loop-closed phi in "
1561 /* If PHI is used in the outer loop, we check that its operand
1562 is defined in the inner loop. */
1563 if (STMT_VINFO_RELEVANT_P (stmt_info
))
1567 if (gimple_phi_num_args (phi
) != 1)
1570 phi_op
= PHI_ARG_DEF (phi
, 0);
1571 stmt_vec_info op_def_info
= loop_vinfo
->lookup_def (phi_op
);
1575 if (STMT_VINFO_RELEVANT (op_def_info
) != vect_used_in_outer
1576 && (STMT_VINFO_RELEVANT (op_def_info
)
1577 != vect_used_in_outer_by_reduction
))
1584 gcc_assert (stmt_info
);
1586 if ((STMT_VINFO_RELEVANT (stmt_info
) == vect_used_in_scope
1587 || STMT_VINFO_LIVE_P (stmt_info
))
1588 && STMT_VINFO_DEF_TYPE (stmt_info
) != vect_induction_def
)
1590 /* A scalar-dependence cycle that we don't support. */
1591 if (dump_enabled_p ())
1592 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1593 "not vectorized: scalar dependence cycle.\n");
1597 if (STMT_VINFO_RELEVANT_P (stmt_info
))
1599 need_to_vectorize
= true;
1600 if (STMT_VINFO_DEF_TYPE (stmt_info
) == vect_induction_def
1601 && ! PURE_SLP_STMT (stmt_info
))
1602 ok
= vectorizable_induction (phi
, NULL
, NULL
, NULL
, &cost_vec
);
1603 else if ((STMT_VINFO_DEF_TYPE (stmt_info
) == vect_reduction_def
1604 || STMT_VINFO_DEF_TYPE (stmt_info
) == vect_nested_cycle
)
1605 && ! PURE_SLP_STMT (stmt_info
))
1606 ok
= vectorizable_reduction (phi
, NULL
, NULL
, NULL
, NULL
,
1610 /* SLP PHIs are tested by vect_slp_analyze_node_operations. */
1612 && STMT_VINFO_LIVE_P (stmt_info
)
1613 && !PURE_SLP_STMT (stmt_info
))
1614 ok
= vectorizable_live_operation (phi
, NULL
, NULL
, -1, NULL
,
1619 if (dump_enabled_p ())
1621 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1622 "not vectorized: relevant phi not "
1624 dump_gimple_stmt (MSG_MISSED_OPTIMIZATION
, TDF_SLIM
, phi
, 0);
1630 for (gimple_stmt_iterator si
= gsi_start_bb (bb
); !gsi_end_p (si
);
1633 gimple
*stmt
= gsi_stmt (si
);
1634 if (!gimple_clobber_p (stmt
)
1635 && !vect_analyze_stmt (stmt
, &need_to_vectorize
, NULL
, NULL
,
1641 add_stmt_costs (loop_vinfo
->target_cost_data
, &cost_vec
);
1642 cost_vec
.release ();
1644 /* All operations in the loop are either irrelevant (deal with loop
1645 control, or dead), or only used outside the loop and can be moved
1646 out of the loop (e.g. invariants, inductions). The loop can be
1647 optimized away by scalar optimizations. We're better off not
1648 touching this loop. */
1649 if (!need_to_vectorize
)
1651 if (dump_enabled_p ())
1652 dump_printf_loc (MSG_NOTE
, vect_location
,
1653 "All the computation can be taken out of the loop.\n");
1654 if (dump_enabled_p ())
1655 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1656 "not vectorized: redundant loop. no profit to "
1664 /* Analyze the cost of the loop described by LOOP_VINFO. Decide if it
1665 is worthwhile to vectorize. Return 1 if definitely yes, 0 if
1666 definitely no, or -1 if it's worth retrying. */
1669 vect_analyze_loop_costing (loop_vec_info loop_vinfo
)
1671 struct loop
*loop
= LOOP_VINFO_LOOP (loop_vinfo
);
1672 unsigned int assumed_vf
= vect_vf_for_cost (loop_vinfo
);
1674 /* Only fully-masked loops can have iteration counts less than the
1675 vectorization factor. */
1676 if (!LOOP_VINFO_FULLY_MASKED_P (loop_vinfo
))
1678 HOST_WIDE_INT max_niter
;
1680 if (LOOP_VINFO_NITERS_KNOWN_P (loop_vinfo
))
1681 max_niter
= LOOP_VINFO_INT_NITERS (loop_vinfo
);
1683 max_niter
= max_stmt_executions_int (loop
);
1686 && (unsigned HOST_WIDE_INT
) max_niter
< assumed_vf
)
1688 if (dump_enabled_p ())
1689 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1690 "not vectorized: iteration count smaller than "
1691 "vectorization factor.\n");
1696 int min_profitable_iters
, min_profitable_estimate
;
1697 vect_estimate_min_profitable_iters (loop_vinfo
, &min_profitable_iters
,
1698 &min_profitable_estimate
);
1700 if (min_profitable_iters
< 0)
1702 if (dump_enabled_p ())
1703 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1704 "not vectorized: vectorization not profitable.\n");
1705 if (dump_enabled_p ())
1706 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1707 "not vectorized: vector version will never be "
1712 int min_scalar_loop_bound
= (PARAM_VALUE (PARAM_MIN_VECT_LOOP_BOUND
)
1715 /* Use the cost model only if it is more conservative than user specified
1717 unsigned int th
= (unsigned) MAX (min_scalar_loop_bound
,
1718 min_profitable_iters
);
1720 LOOP_VINFO_COST_MODEL_THRESHOLD (loop_vinfo
) = th
;
1722 if (LOOP_VINFO_NITERS_KNOWN_P (loop_vinfo
)
1723 && LOOP_VINFO_INT_NITERS (loop_vinfo
) < th
)
1725 if (dump_enabled_p ())
1726 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1727 "not vectorized: vectorization not profitable.\n");
1728 if (dump_enabled_p ())
1729 dump_printf_loc (MSG_NOTE
, vect_location
,
1730 "not vectorized: iteration count smaller than user "
1731 "specified loop bound parameter or minimum profitable "
1732 "iterations (whichever is more conservative).\n");
1736 HOST_WIDE_INT estimated_niter
= estimated_stmt_executions_int (loop
);
1737 if (estimated_niter
== -1)
1738 estimated_niter
= likely_max_stmt_executions_int (loop
);
1739 if (estimated_niter
!= -1
1740 && ((unsigned HOST_WIDE_INT
) estimated_niter
1741 < MAX (th
, (unsigned) min_profitable_estimate
)))
1743 if (dump_enabled_p ())
1744 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1745 "not vectorized: estimated iteration count too "
1747 if (dump_enabled_p ())
1748 dump_printf_loc (MSG_NOTE
, vect_location
,
1749 "not vectorized: estimated iteration count smaller "
1750 "than specified loop bound parameter or minimum "
1751 "profitable iterations (whichever is more "
1752 "conservative).\n");
1760 vect_get_datarefs_in_loop (loop_p loop
, basic_block
*bbs
,
1761 vec
<data_reference_p
> *datarefs
,
1762 unsigned int *n_stmts
)
1765 for (unsigned i
= 0; i
< loop
->num_nodes
; i
++)
1766 for (gimple_stmt_iterator gsi
= gsi_start_bb (bbs
[i
]);
1767 !gsi_end_p (gsi
); gsi_next (&gsi
))
1769 gimple
*stmt
= gsi_stmt (gsi
);
1770 if (is_gimple_debug (stmt
))
1773 if (!vect_find_stmt_data_reference (loop
, stmt
, datarefs
))
1775 if (is_gimple_call (stmt
) && loop
->safelen
)
1777 tree fndecl
= gimple_call_fndecl (stmt
), op
;
1778 if (fndecl
!= NULL_TREE
)
1780 cgraph_node
*node
= cgraph_node::get (fndecl
);
1781 if (node
!= NULL
&& node
->simd_clones
!= NULL
)
1783 unsigned int j
, n
= gimple_call_num_args (stmt
);
1784 for (j
= 0; j
< n
; j
++)
1786 op
= gimple_call_arg (stmt
, j
);
1788 || (REFERENCE_CLASS_P (op
)
1789 && get_base_address (op
)))
1792 op
= gimple_call_lhs (stmt
);
1793 /* Ignore #pragma omp declare simd functions
1794 if they don't have data references in the
1795 call stmt itself. */
1799 || (REFERENCE_CLASS_P (op
)
1800 && get_base_address (op
)))))
1807 /* If dependence analysis will give up due to the limit on the
1808 number of datarefs stop here and fail fatally. */
1809 if (datarefs
->length ()
1810 > (unsigned)PARAM_VALUE (PARAM_LOOP_MAX_DATAREFS_FOR_DATADEPS
))
1816 /* Function vect_analyze_loop_2.
1818 Apply a set of analyses on LOOP, and create a loop_vec_info struct
1819 for it. The different analyses will record information in the
1820 loop_vec_info struct. */
1822 vect_analyze_loop_2 (loop_vec_info loop_vinfo
, bool &fatal
, unsigned *n_stmts
)
1826 unsigned int max_vf
= MAX_VECTORIZATION_FACTOR
;
1827 poly_uint64 min_vf
= 2;
1829 /* The first group of checks is independent of the vector size. */
1832 /* Find all data references in the loop (which correspond to vdefs/vuses)
1833 and analyze their evolution in the loop. */
1835 loop_p loop
= LOOP_VINFO_LOOP (loop_vinfo
);
1837 /* Gather the data references and count stmts in the loop. */
1838 if (!LOOP_VINFO_DATAREFS (loop_vinfo
).exists ())
1840 if (!vect_get_datarefs_in_loop (loop
, LOOP_VINFO_BBS (loop_vinfo
),
1841 &LOOP_VINFO_DATAREFS (loop_vinfo
),
1844 if (dump_enabled_p ())
1845 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1846 "not vectorized: loop contains function "
1847 "calls or data references that cannot "
1851 loop_vinfo
->shared
->save_datarefs ();
1854 loop_vinfo
->shared
->check_datarefs ();
1856 /* Analyze the data references and also adjust the minimal
1857 vectorization factor according to the loads and stores. */
1859 ok
= vect_analyze_data_refs (loop_vinfo
, &min_vf
);
1862 if (dump_enabled_p ())
1863 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1864 "bad data references.\n");
1868 /* Classify all cross-iteration scalar data-flow cycles.
1869 Cross-iteration cycles caused by virtual phis are analyzed separately. */
1870 vect_analyze_scalar_cycles (loop_vinfo
);
1872 vect_pattern_recog (loop_vinfo
);
1874 vect_fixup_scalar_cycles_with_patterns (loop_vinfo
);
1876 /* Analyze the access patterns of the data-refs in the loop (consecutive,
1877 complex, etc.). FORNOW: Only handle consecutive access pattern. */
1879 ok
= vect_analyze_data_ref_accesses (loop_vinfo
);
1882 if (dump_enabled_p ())
1883 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1884 "bad data access.\n");
1888 /* Data-flow analysis to detect stmts that do not need to be vectorized. */
1890 ok
= vect_mark_stmts_to_be_vectorized (loop_vinfo
);
1893 if (dump_enabled_p ())
1894 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1895 "unexpected pattern.\n");
1899 /* While the rest of the analysis below depends on it in some way. */
1902 /* Analyze data dependences between the data-refs in the loop
1903 and adjust the maximum vectorization factor according to
1905 FORNOW: fail at the first data dependence that we encounter. */
1907 ok
= vect_analyze_data_ref_dependences (loop_vinfo
, &max_vf
);
1909 || (max_vf
!= MAX_VECTORIZATION_FACTOR
1910 && maybe_lt (max_vf
, min_vf
)))
1912 if (dump_enabled_p ())
1913 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1914 "bad data dependence.\n");
1917 LOOP_VINFO_MAX_VECT_FACTOR (loop_vinfo
) = max_vf
;
1919 ok
= vect_determine_vectorization_factor (loop_vinfo
);
1922 if (dump_enabled_p ())
1923 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1924 "can't determine vectorization factor.\n");
1927 if (max_vf
!= MAX_VECTORIZATION_FACTOR
1928 && maybe_lt (max_vf
, LOOP_VINFO_VECT_FACTOR (loop_vinfo
)))
1930 if (dump_enabled_p ())
1931 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1932 "bad data dependence.\n");
1936 /* Compute the scalar iteration cost. */
1937 vect_compute_single_scalar_iteration_cost (loop_vinfo
);
1939 poly_uint64 saved_vectorization_factor
= LOOP_VINFO_VECT_FACTOR (loop_vinfo
);
1942 /* Check the SLP opportunities in the loop, analyze and build SLP trees. */
1943 ok
= vect_analyze_slp (loop_vinfo
, *n_stmts
);
1947 /* If there are any SLP instances mark them as pure_slp. */
1948 bool slp
= vect_make_slp_decision (loop_vinfo
);
1951 /* Find stmts that need to be both vectorized and SLPed. */
1952 vect_detect_hybrid_slp (loop_vinfo
);
1954 /* Update the vectorization factor based on the SLP decision. */
1955 vect_update_vf_for_slp (loop_vinfo
);
1958 bool saved_can_fully_mask_p
= LOOP_VINFO_CAN_FULLY_MASK_P (loop_vinfo
);
1960 /* We don't expect to have to roll back to anything other than an empty
1962 gcc_assert (LOOP_VINFO_MASKS (loop_vinfo
).is_empty ());
1964 /* This is the point where we can re-start analysis with SLP forced off. */
1967 /* Now the vectorization factor is final. */
1968 poly_uint64 vectorization_factor
= LOOP_VINFO_VECT_FACTOR (loop_vinfo
);
1969 gcc_assert (known_ne (vectorization_factor
, 0U));
1971 if (LOOP_VINFO_NITERS_KNOWN_P (loop_vinfo
) && dump_enabled_p ())
1973 dump_printf_loc (MSG_NOTE
, vect_location
,
1974 "vectorization_factor = ");
1975 dump_dec (MSG_NOTE
, vectorization_factor
);
1976 dump_printf (MSG_NOTE
, ", niters = " HOST_WIDE_INT_PRINT_DEC
"\n",
1977 LOOP_VINFO_INT_NITERS (loop_vinfo
));
1980 HOST_WIDE_INT max_niter
1981 = likely_max_stmt_executions_int (LOOP_VINFO_LOOP (loop_vinfo
));
1983 /* Analyze the alignment of the data-refs in the loop.
1984 Fail if a data reference is found that cannot be vectorized. */
1986 ok
= vect_analyze_data_refs_alignment (loop_vinfo
);
1989 if (dump_enabled_p ())
1990 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
1991 "bad data alignment.\n");
1995 /* Prune the list of ddrs to be tested at run-time by versioning for alias.
1996 It is important to call pruning after vect_analyze_data_ref_accesses,
1997 since we use grouping information gathered by interleaving analysis. */
1998 ok
= vect_prune_runtime_alias_test_list (loop_vinfo
);
2002 /* Do not invoke vect_enhance_data_refs_alignment for eplilogue
2004 if (!LOOP_VINFO_EPILOGUE_P (loop_vinfo
))
2006 /* This pass will decide on using loop versioning and/or loop peeling in
2007 order to enhance the alignment of data references in the loop. */
2008 ok
= vect_enhance_data_refs_alignment (loop_vinfo
);
2011 if (dump_enabled_p ())
2012 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
2013 "bad data alignment.\n");
2020 /* Analyze operations in the SLP instances. Note this may
2021 remove unsupported SLP instances which makes the above
2022 SLP kind detection invalid. */
2023 unsigned old_size
= LOOP_VINFO_SLP_INSTANCES (loop_vinfo
).length ();
2024 vect_slp_analyze_operations (loop_vinfo
);
2025 if (LOOP_VINFO_SLP_INSTANCES (loop_vinfo
).length () != old_size
)
2029 /* Scan all the remaining operations in the loop that are not subject
2030 to SLP and make sure they are vectorizable. */
2031 ok
= vect_analyze_loop_operations (loop_vinfo
);
2034 if (dump_enabled_p ())
2035 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
2036 "bad operation or unsupported loop bound.\n");
2040 /* Decide whether to use a fully-masked loop for this vectorization
2042 LOOP_VINFO_FULLY_MASKED_P (loop_vinfo
)
2043 = (LOOP_VINFO_CAN_FULLY_MASK_P (loop_vinfo
)
2044 && vect_verify_full_masking (loop_vinfo
));
2045 if (dump_enabled_p ())
2047 if (LOOP_VINFO_FULLY_MASKED_P (loop_vinfo
))
2048 dump_printf_loc (MSG_NOTE
, vect_location
,
2049 "using a fully-masked loop.\n");
2051 dump_printf_loc (MSG_NOTE
, vect_location
,
2052 "not using a fully-masked loop.\n");
2055 /* If epilog loop is required because of data accesses with gaps,
2056 one additional iteration needs to be peeled. Check if there is
2057 enough iterations for vectorization. */
2058 if (LOOP_VINFO_PEELING_FOR_GAPS (loop_vinfo
)
2059 && LOOP_VINFO_NITERS_KNOWN_P (loop_vinfo
)
2060 && !LOOP_VINFO_FULLY_MASKED_P (loop_vinfo
))
2062 poly_uint64 vf
= LOOP_VINFO_VECT_FACTOR (loop_vinfo
);
2063 tree scalar_niters
= LOOP_VINFO_NITERSM1 (loop_vinfo
);
2065 if (known_lt (wi::to_widest (scalar_niters
), vf
))
2067 if (dump_enabled_p ())
2068 dump_printf_loc (MSG_NOTE
, vect_location
,
2069 "loop has no enough iterations to support"
2070 " peeling for gaps.\n");
2075 /* Check the costings of the loop make vectorizing worthwhile. */
2076 res
= vect_analyze_loop_costing (loop_vinfo
);
2081 if (dump_enabled_p ())
2082 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
2083 "Loop costings not worthwhile.\n");
2087 /* Decide whether we need to create an epilogue loop to handle
2088 remaining scalar iterations. */
2089 th
= LOOP_VINFO_COST_MODEL_THRESHOLD (loop_vinfo
);
2091 unsigned HOST_WIDE_INT const_vf
;
2092 if (LOOP_VINFO_FULLY_MASKED_P (loop_vinfo
))
2093 /* The main loop handles all iterations. */
2094 LOOP_VINFO_PEELING_FOR_NITER (loop_vinfo
) = false;
2095 else if (LOOP_VINFO_NITERS_KNOWN_P (loop_vinfo
)
2096 && LOOP_VINFO_PEELING_FOR_ALIGNMENT (loop_vinfo
) > 0)
2098 if (!multiple_p (LOOP_VINFO_INT_NITERS (loop_vinfo
)
2099 - LOOP_VINFO_PEELING_FOR_ALIGNMENT (loop_vinfo
),
2100 LOOP_VINFO_VECT_FACTOR (loop_vinfo
)))
2101 LOOP_VINFO_PEELING_FOR_NITER (loop_vinfo
) = true;
2103 else if (LOOP_VINFO_PEELING_FOR_ALIGNMENT (loop_vinfo
)
2104 || !LOOP_VINFO_VECT_FACTOR (loop_vinfo
).is_constant (&const_vf
)
2105 || ((tree_ctz (LOOP_VINFO_NITERS (loop_vinfo
))
2106 < (unsigned) exact_log2 (const_vf
))
2107 /* In case of versioning, check if the maximum number of
2108 iterations is greater than th. If they are identical,
2109 the epilogue is unnecessary. */
2110 && (!LOOP_REQUIRES_VERSIONING (loop_vinfo
)
2111 || ((unsigned HOST_WIDE_INT
) max_niter
2112 > (th
/ const_vf
) * const_vf
))))
2113 LOOP_VINFO_PEELING_FOR_NITER (loop_vinfo
) = true;
2115 /* If an epilogue loop is required make sure we can create one. */
2116 if (LOOP_VINFO_PEELING_FOR_GAPS (loop_vinfo
)
2117 || LOOP_VINFO_PEELING_FOR_NITER (loop_vinfo
))
2119 if (dump_enabled_p ())
2120 dump_printf_loc (MSG_NOTE
, vect_location
, "epilog loop required\n");
2121 if (!vect_can_advance_ivs_p (loop_vinfo
)
2122 || !slpeel_can_duplicate_loop_p (LOOP_VINFO_LOOP (loop_vinfo
),
2123 single_exit (LOOP_VINFO_LOOP
2126 if (dump_enabled_p ())
2127 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
2128 "not vectorized: can't create required "
2134 /* During peeling, we need to check if number of loop iterations is
2135 enough for both peeled prolog loop and vector loop. This check
2136 can be merged along with threshold check of loop versioning, so
2137 increase threshold for this case if necessary. */
2138 if (LOOP_REQUIRES_VERSIONING (loop_vinfo
))
2140 poly_uint64 niters_th
= 0;
2142 if (!vect_use_loop_mask_for_alignment_p (loop_vinfo
))
2144 /* Niters for peeled prolog loop. */
2145 if (LOOP_VINFO_PEELING_FOR_ALIGNMENT (loop_vinfo
) < 0)
2147 struct data_reference
*dr
= LOOP_VINFO_UNALIGNED_DR (loop_vinfo
);
2148 tree vectype
= STMT_VINFO_VECTYPE (vect_dr_stmt (dr
));
2149 niters_th
+= TYPE_VECTOR_SUBPARTS (vectype
) - 1;
2152 niters_th
+= LOOP_VINFO_PEELING_FOR_ALIGNMENT (loop_vinfo
);
2155 /* Niters for at least one iteration of vectorized loop. */
2156 if (!LOOP_VINFO_FULLY_MASKED_P (loop_vinfo
))
2157 niters_th
+= LOOP_VINFO_VECT_FACTOR (loop_vinfo
);
2158 /* One additional iteration because of peeling for gap. */
2159 if (LOOP_VINFO_PEELING_FOR_GAPS (loop_vinfo
))
2161 LOOP_VINFO_VERSIONING_THRESHOLD (loop_vinfo
) = niters_th
;
2164 gcc_assert (known_eq (vectorization_factor
,
2165 LOOP_VINFO_VECT_FACTOR (loop_vinfo
)));
2167 /* Ok to vectorize! */
2171 /* Try again with SLP forced off but if we didn't do any SLP there is
2172 no point in re-trying. */
2176 /* If there are reduction chains re-trying will fail anyway. */
2177 if (! LOOP_VINFO_REDUCTION_CHAINS (loop_vinfo
).is_empty ())
2180 /* Likewise if the grouped loads or stores in the SLP cannot be handled
2181 via interleaving or lane instructions. */
2182 slp_instance instance
;
2185 FOR_EACH_VEC_ELT (LOOP_VINFO_SLP_INSTANCES (loop_vinfo
), i
, instance
)
2187 stmt_vec_info vinfo
;
2188 vinfo
= SLP_TREE_SCALAR_STMTS (SLP_INSTANCE_TREE (instance
))[0];
2189 if (! STMT_VINFO_GROUPED_ACCESS (vinfo
))
2191 vinfo
= DR_GROUP_FIRST_ELEMENT (vinfo
);
2192 unsigned int size
= DR_GROUP_SIZE (vinfo
);
2193 tree vectype
= STMT_VINFO_VECTYPE (vinfo
);
2194 if (! vect_store_lanes_supported (vectype
, size
, false)
2195 && ! known_eq (TYPE_VECTOR_SUBPARTS (vectype
), 1U)
2196 && ! vect_grouped_store_supported (vectype
, size
))
2198 FOR_EACH_VEC_ELT (SLP_INSTANCE_LOADS (instance
), j
, node
)
2200 vinfo
= SLP_TREE_SCALAR_STMTS (node
)[0];
2201 vinfo
= DR_GROUP_FIRST_ELEMENT (vinfo
);
2202 bool single_element_p
= !DR_GROUP_NEXT_ELEMENT (vinfo
);
2203 size
= DR_GROUP_SIZE (vinfo
);
2204 vectype
= STMT_VINFO_VECTYPE (vinfo
);
2205 if (! vect_load_lanes_supported (vectype
, size
, false)
2206 && ! vect_grouped_load_supported (vectype
, single_element_p
,
2212 if (dump_enabled_p ())
2213 dump_printf_loc (MSG_NOTE
, vect_location
,
2214 "re-trying with SLP disabled\n");
2216 /* Roll back state appropriately. No SLP this time. */
2218 /* Restore vectorization factor as it were without SLP. */
2219 LOOP_VINFO_VECT_FACTOR (loop_vinfo
) = saved_vectorization_factor
;
2220 /* Free the SLP instances. */
2221 FOR_EACH_VEC_ELT (LOOP_VINFO_SLP_INSTANCES (loop_vinfo
), j
, instance
)
2222 vect_free_slp_instance (instance
, false);
2223 LOOP_VINFO_SLP_INSTANCES (loop_vinfo
).release ();
2224 /* Reset SLP type to loop_vect on all stmts. */
2225 for (i
= 0; i
< LOOP_VINFO_LOOP (loop_vinfo
)->num_nodes
; ++i
)
2227 basic_block bb
= LOOP_VINFO_BBS (loop_vinfo
)[i
];
2228 for (gimple_stmt_iterator si
= gsi_start_phis (bb
);
2229 !gsi_end_p (si
); gsi_next (&si
))
2231 stmt_vec_info stmt_info
= loop_vinfo
->lookup_stmt (gsi_stmt (si
));
2232 STMT_SLP_TYPE (stmt_info
) = loop_vect
;
2234 for (gimple_stmt_iterator si
= gsi_start_bb (bb
);
2235 !gsi_end_p (si
); gsi_next (&si
))
2237 stmt_vec_info stmt_info
= loop_vinfo
->lookup_stmt (gsi_stmt (si
));
2238 STMT_SLP_TYPE (stmt_info
) = loop_vect
;
2239 if (STMT_VINFO_IN_PATTERN_P (stmt_info
))
2241 gimple
*pattern_def_seq
= STMT_VINFO_PATTERN_DEF_SEQ (stmt_info
);
2242 stmt_info
= STMT_VINFO_RELATED_STMT (stmt_info
);
2243 STMT_SLP_TYPE (stmt_info
) = loop_vect
;
2244 for (gimple_stmt_iterator pi
= gsi_start (pattern_def_seq
);
2245 !gsi_end_p (pi
); gsi_next (&pi
))
2246 STMT_SLP_TYPE (loop_vinfo
->lookup_stmt (gsi_stmt (pi
)))
2251 /* Free optimized alias test DDRS. */
2252 LOOP_VINFO_LOWER_BOUNDS (loop_vinfo
).truncate (0);
2253 LOOP_VINFO_COMP_ALIAS_DDRS (loop_vinfo
).release ();
2254 LOOP_VINFO_CHECK_UNEQUAL_ADDRS (loop_vinfo
).release ();
2255 /* Reset target cost data. */
2256 destroy_cost_data (LOOP_VINFO_TARGET_COST_DATA (loop_vinfo
));
2257 LOOP_VINFO_TARGET_COST_DATA (loop_vinfo
)
2258 = init_cost (LOOP_VINFO_LOOP (loop_vinfo
));
2259 /* Reset accumulated rgroup information. */
2260 release_vec_loop_masks (&LOOP_VINFO_MASKS (loop_vinfo
));
2261 /* Reset assorted flags. */
2262 LOOP_VINFO_PEELING_FOR_NITER (loop_vinfo
) = false;
2263 LOOP_VINFO_PEELING_FOR_GAPS (loop_vinfo
) = false;
2264 LOOP_VINFO_COST_MODEL_THRESHOLD (loop_vinfo
) = 0;
2265 LOOP_VINFO_VERSIONING_THRESHOLD (loop_vinfo
) = 0;
2266 LOOP_VINFO_CAN_FULLY_MASK_P (loop_vinfo
) = saved_can_fully_mask_p
;
2271 /* Function vect_analyze_loop.
2273 Apply a set of analyses on LOOP, and create a loop_vec_info struct
2274 for it. The different analyses will record information in the
2275 loop_vec_info struct. If ORIG_LOOP_VINFO is not NULL epilogue must
2278 vect_analyze_loop (struct loop
*loop
, loop_vec_info orig_loop_vinfo
,
2279 vec_info_shared
*shared
)
2281 loop_vec_info loop_vinfo
;
2282 auto_vector_sizes vector_sizes
;
2284 /* Autodetect first vector size we try. */
2285 current_vector_size
= 0;
2286 targetm
.vectorize
.autovectorize_vector_sizes (&vector_sizes
);
2287 unsigned int next_size
= 0;
2289 DUMP_VECT_SCOPE ("analyze_loop_nest");
2291 if (loop_outer (loop
)
2292 && loop_vec_info_for_loop (loop_outer (loop
))
2293 && LOOP_VINFO_VECTORIZABLE_P (loop_vec_info_for_loop (loop_outer (loop
))))
2295 if (dump_enabled_p ())
2296 dump_printf_loc (MSG_NOTE
, vect_location
,
2297 "outer-loop already vectorized.\n");
2301 if (!find_loop_nest (loop
, &shared
->loop_nest
))
2303 if (dump_enabled_p ())
2304 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
2305 "not vectorized: loop nest containing two "
2306 "or more consecutive inner loops cannot be "
2311 unsigned n_stmts
= 0;
2312 poly_uint64 autodetected_vector_size
= 0;
2315 /* Check the CFG characteristics of the loop (nesting, entry/exit). */
2316 loop_vinfo
= vect_analyze_loop_form (loop
, shared
);
2319 if (dump_enabled_p ())
2320 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
2321 "bad loop form.\n");
2327 if (orig_loop_vinfo
)
2328 LOOP_VINFO_ORIG_LOOP_INFO (loop_vinfo
) = orig_loop_vinfo
;
2330 if (vect_analyze_loop_2 (loop_vinfo
, fatal
, &n_stmts
))
2332 LOOP_VINFO_VECTORIZABLE_P (loop_vinfo
) = 1;
2340 autodetected_vector_size
= current_vector_size
;
2342 if (next_size
< vector_sizes
.length ()
2343 && known_eq (vector_sizes
[next_size
], autodetected_vector_size
))
2347 || next_size
== vector_sizes
.length ()
2348 || known_eq (current_vector_size
, 0U))
2351 /* Try the next biggest vector size. */
2352 current_vector_size
= vector_sizes
[next_size
++];
2353 if (dump_enabled_p ())
2355 dump_printf_loc (MSG_NOTE
, vect_location
,
2356 "***** Re-trying analysis with "
2358 dump_dec (MSG_NOTE
, current_vector_size
);
2359 dump_printf (MSG_NOTE
, "\n");
2364 /* Return true if there is an in-order reduction function for CODE, storing
2365 it in *REDUC_FN if so. */
2368 fold_left_reduction_fn (tree_code code
, internal_fn
*reduc_fn
)
2373 *reduc_fn
= IFN_FOLD_LEFT_PLUS
;
2381 /* Function reduction_fn_for_scalar_code
2384 CODE - tree_code of a reduction operations.
2387 REDUC_FN - the corresponding internal function to be used to reduce the
2388 vector of partial results into a single scalar result, or IFN_LAST
2389 if the operation is a supported reduction operation, but does not have
2390 such an internal function.
2392 Return FALSE if CODE currently cannot be vectorized as reduction. */
2395 reduction_fn_for_scalar_code (enum tree_code code
, internal_fn
*reduc_fn
)
2400 *reduc_fn
= IFN_REDUC_MAX
;
2404 *reduc_fn
= IFN_REDUC_MIN
;
2408 *reduc_fn
= IFN_REDUC_PLUS
;
2412 *reduc_fn
= IFN_REDUC_AND
;
2416 *reduc_fn
= IFN_REDUC_IOR
;
2420 *reduc_fn
= IFN_REDUC_XOR
;
2425 *reduc_fn
= IFN_LAST
;
2433 /* If there is a neutral value X such that SLP reduction NODE would not
2434 be affected by the introduction of additional X elements, return that X,
2435 otherwise return null. CODE is the code of the reduction. REDUC_CHAIN
2436 is true if the SLP statements perform a single reduction, false if each
2437 statement performs an independent reduction. */
2440 neutral_op_for_slp_reduction (slp_tree slp_node
, tree_code code
,
2443 vec
<stmt_vec_info
> stmts
= SLP_TREE_SCALAR_STMTS (slp_node
);
2444 stmt_vec_info stmt_vinfo
= stmts
[0];
2445 tree vector_type
= STMT_VINFO_VECTYPE (stmt_vinfo
);
2446 tree scalar_type
= TREE_TYPE (vector_type
);
2447 struct loop
*loop
= gimple_bb (stmt_vinfo
->stmt
)->loop_father
;
2452 case WIDEN_SUM_EXPR
:
2459 return build_zero_cst (scalar_type
);
2462 return build_one_cst (scalar_type
);
2465 return build_all_ones_cst (scalar_type
);
2469 /* For MIN/MAX the initial values are neutral. A reduction chain
2470 has only a single initial value, so that value is neutral for
2473 return PHI_ARG_DEF_FROM_EDGE (stmt_vinfo
->stmt
,
2474 loop_preheader_edge (loop
));
2482 /* Error reporting helper for vect_is_simple_reduction below. GIMPLE statement
2483 STMT is printed with a message MSG. */
2486 report_vect_op (dump_flags_t msg_type
, gimple
*stmt
, const char *msg
)
2488 dump_printf_loc (msg_type
, vect_location
, "%s", msg
);
2489 dump_gimple_stmt (msg_type
, TDF_SLIM
, stmt
, 0);
2492 /* DEF_STMT_INFO occurs in a loop that contains a potential reduction
2493 operation. Return true if the results of DEF_STMT_INFO are something
2494 that can be accumulated by such a reduction. */
2497 vect_valid_reduction_input_p (stmt_vec_info def_stmt_info
)
2499 return (is_gimple_assign (def_stmt_info
->stmt
)
2500 || is_gimple_call (def_stmt_info
->stmt
)
2501 || STMT_VINFO_DEF_TYPE (def_stmt_info
) == vect_induction_def
2502 || (gimple_code (def_stmt_info
->stmt
) == GIMPLE_PHI
2503 && STMT_VINFO_DEF_TYPE (def_stmt_info
) == vect_internal_def
2504 && !is_loop_header_bb_p (gimple_bb (def_stmt_info
->stmt
))));
2507 /* Detect SLP reduction of the form:
2517 PHI is the reduction phi node (#a1 = phi <a5, a0> above)
2518 FIRST_STMT is the first reduction stmt in the chain
2519 (a2 = operation (a1)).
2521 Return TRUE if a reduction chain was detected. */
2524 vect_is_slp_reduction (loop_vec_info loop_info
, gimple
*phi
,
2527 struct loop
*loop
= (gimple_bb (phi
))->loop_father
;
2528 struct loop
*vect_loop
= LOOP_VINFO_LOOP (loop_info
);
2529 enum tree_code code
;
2530 gimple
*loop_use_stmt
= NULL
;
2531 stmt_vec_info use_stmt_info
, current_stmt_info
= NULL
;
2533 imm_use_iterator imm_iter
;
2534 use_operand_p use_p
;
2535 int nloop_uses
, size
= 0, n_out_of_loop_uses
;
2538 if (loop
!= vect_loop
)
2541 lhs
= PHI_RESULT (phi
);
2542 code
= gimple_assign_rhs_code (first_stmt
);
2546 n_out_of_loop_uses
= 0;
2547 FOR_EACH_IMM_USE_FAST (use_p
, imm_iter
, lhs
)
2549 gimple
*use_stmt
= USE_STMT (use_p
);
2550 if (is_gimple_debug (use_stmt
))
2553 /* Check if we got back to the reduction phi. */
2554 if (use_stmt
== phi
)
2556 loop_use_stmt
= use_stmt
;
2561 if (flow_bb_inside_loop_p (loop
, gimple_bb (use_stmt
)))
2563 loop_use_stmt
= use_stmt
;
2567 n_out_of_loop_uses
++;
2569 /* There are can be either a single use in the loop or two uses in
2571 if (nloop_uses
> 1 || (n_out_of_loop_uses
&& nloop_uses
))
2578 /* We reached a statement with no loop uses. */
2579 if (nloop_uses
== 0)
2582 /* This is a loop exit phi, and we haven't reached the reduction phi. */
2583 if (gimple_code (loop_use_stmt
) == GIMPLE_PHI
)
2586 if (!is_gimple_assign (loop_use_stmt
)
2587 || code
!= gimple_assign_rhs_code (loop_use_stmt
)
2588 || !flow_bb_inside_loop_p (loop
, gimple_bb (loop_use_stmt
)))
2591 /* Insert USE_STMT into reduction chain. */
2592 use_stmt_info
= loop_info
->lookup_stmt (loop_use_stmt
);
2593 if (current_stmt_info
)
2595 REDUC_GROUP_NEXT_ELEMENT (current_stmt_info
) = use_stmt_info
;
2596 REDUC_GROUP_FIRST_ELEMENT (use_stmt_info
)
2597 = REDUC_GROUP_FIRST_ELEMENT (current_stmt_info
);
2600 REDUC_GROUP_FIRST_ELEMENT (use_stmt_info
) = use_stmt_info
;
2602 lhs
= gimple_assign_lhs (loop_use_stmt
);
2603 current_stmt_info
= use_stmt_info
;
2607 if (!found
|| loop_use_stmt
!= phi
|| size
< 2)
2610 /* Swap the operands, if needed, to make the reduction operand be the second
2612 lhs
= PHI_RESULT (phi
);
2613 stmt_vec_info next_stmt_info
= REDUC_GROUP_FIRST_ELEMENT (current_stmt_info
);
2614 while (next_stmt_info
)
2616 gassign
*next_stmt
= as_a
<gassign
*> (next_stmt_info
->stmt
);
2617 if (gimple_assign_rhs2 (next_stmt
) == lhs
)
2619 tree op
= gimple_assign_rhs1 (next_stmt
);
2620 stmt_vec_info def_stmt_info
= loop_info
->lookup_def (op
);
2622 /* Check that the other def is either defined in the loop
2623 ("vect_internal_def"), or it's an induction (defined by a
2624 loop-header phi-node). */
2626 && flow_bb_inside_loop_p (loop
, gimple_bb (def_stmt_info
->stmt
))
2627 && vect_valid_reduction_input_p (def_stmt_info
))
2629 lhs
= gimple_assign_lhs (next_stmt
);
2630 next_stmt_info
= REDUC_GROUP_NEXT_ELEMENT (next_stmt_info
);
2638 tree op
= gimple_assign_rhs2 (next_stmt
);
2639 stmt_vec_info def_stmt_info
= loop_info
->lookup_def (op
);
2641 /* Check that the other def is either defined in the loop
2642 ("vect_internal_def"), or it's an induction (defined by a
2643 loop-header phi-node). */
2645 && flow_bb_inside_loop_p (loop
, gimple_bb (def_stmt_info
->stmt
))
2646 && vect_valid_reduction_input_p (def_stmt_info
))
2648 if (dump_enabled_p ())
2650 dump_printf_loc (MSG_NOTE
, vect_location
, "swapping oprnds: ");
2651 dump_gimple_stmt (MSG_NOTE
, TDF_SLIM
, next_stmt
, 0);
2654 swap_ssa_operands (next_stmt
,
2655 gimple_assign_rhs1_ptr (next_stmt
),
2656 gimple_assign_rhs2_ptr (next_stmt
));
2657 update_stmt (next_stmt
);
2659 if (CONSTANT_CLASS_P (gimple_assign_rhs1 (next_stmt
)))
2660 LOOP_VINFO_OPERANDS_SWAPPED (loop_info
) = true;
2666 lhs
= gimple_assign_lhs (next_stmt
);
2667 next_stmt_info
= REDUC_GROUP_NEXT_ELEMENT (next_stmt_info
);
2670 /* Save the chain for further analysis in SLP detection. */
2671 stmt_vec_info first_stmt_info
2672 = REDUC_GROUP_FIRST_ELEMENT (current_stmt_info
);
2673 LOOP_VINFO_REDUCTION_CHAINS (loop_info
).safe_push (first_stmt_info
);
2674 REDUC_GROUP_SIZE (first_stmt_info
) = size
;
2679 /* Return true if we need an in-order reduction for operation CODE
2680 on type TYPE. NEED_WRAPPING_INTEGRAL_OVERFLOW is true if integer
2681 overflow must wrap. */
2684 needs_fold_left_reduction_p (tree type
, tree_code code
,
2685 bool need_wrapping_integral_overflow
)
2687 /* CHECKME: check for !flag_finite_math_only too? */
2688 if (SCALAR_FLOAT_TYPE_P (type
))
2696 return !flag_associative_math
;
2699 if (INTEGRAL_TYPE_P (type
))
2701 if (!operation_no_trapping_overflow (type
, code
))
2703 if (need_wrapping_integral_overflow
2704 && !TYPE_OVERFLOW_WRAPS (type
)
2705 && operation_can_overflow (code
))
2710 if (SAT_FIXED_POINT_TYPE_P (type
))
2716 /* Return true if the reduction PHI in LOOP with latch arg LOOP_ARG and
2717 reduction operation CODE has a handled computation expression. */
2720 check_reduction_path (dump_user_location_t loc
, loop_p loop
, gphi
*phi
,
2721 tree loop_arg
, enum tree_code code
)
2723 auto_vec
<std::pair
<ssa_op_iter
, use_operand_p
> > path
;
2724 auto_bitmap visited
;
2725 tree lookfor
= PHI_RESULT (phi
);
2727 use_operand_p curr
= op_iter_init_phiuse (&curri
, phi
, SSA_OP_USE
);
2728 while (USE_FROM_PTR (curr
) != loop_arg
)
2729 curr
= op_iter_next_use (&curri
);
2730 curri
.i
= curri
.numops
;
2733 path
.safe_push (std::make_pair (curri
, curr
));
2734 tree use
= USE_FROM_PTR (curr
);
2737 gimple
*def
= SSA_NAME_DEF_STMT (use
);
2738 if (gimple_nop_p (def
)
2739 || ! flow_bb_inside_loop_p (loop
, gimple_bb (def
)))
2744 std::pair
<ssa_op_iter
, use_operand_p
> x
= path
.pop ();
2748 curr
= op_iter_next_use (&curri
);
2749 /* Skip already visited or non-SSA operands (from iterating
2751 while (curr
!= NULL_USE_OPERAND_P
2752 && (TREE_CODE (USE_FROM_PTR (curr
)) != SSA_NAME
2753 || ! bitmap_set_bit (visited
,
2755 (USE_FROM_PTR (curr
)))));
2757 while (curr
== NULL_USE_OPERAND_P
&& ! path
.is_empty ());
2758 if (curr
== NULL_USE_OPERAND_P
)
2763 if (gimple_code (def
) == GIMPLE_PHI
)
2764 curr
= op_iter_init_phiuse (&curri
, as_a
<gphi
*>(def
), SSA_OP_USE
);
2766 curr
= op_iter_init_use (&curri
, def
, SSA_OP_USE
);
2767 while (curr
!= NULL_USE_OPERAND_P
2768 && (TREE_CODE (USE_FROM_PTR (curr
)) != SSA_NAME
2769 || ! bitmap_set_bit (visited
,
2771 (USE_FROM_PTR (curr
)))))
2772 curr
= op_iter_next_use (&curri
);
2773 if (curr
== NULL_USE_OPERAND_P
)
2778 if (dump_file
&& (dump_flags
& TDF_DETAILS
))
2780 dump_printf_loc (MSG_NOTE
, loc
, "reduction path: ");
2782 std::pair
<ssa_op_iter
, use_operand_p
> *x
;
2783 FOR_EACH_VEC_ELT (path
, i
, x
)
2785 dump_generic_expr (MSG_NOTE
, TDF_SLIM
, USE_FROM_PTR (x
->second
));
2786 dump_printf (MSG_NOTE
, " ");
2788 dump_printf (MSG_NOTE
, "\n");
2791 /* Check whether the reduction path detected is valid. */
2792 bool fail
= path
.length () == 0;
2794 for (unsigned i
= 1; i
< path
.length (); ++i
)
2796 gimple
*use_stmt
= USE_STMT (path
[i
].second
);
2797 tree op
= USE_FROM_PTR (path
[i
].second
);
2798 if (! has_single_use (op
)
2799 || ! is_gimple_assign (use_stmt
))
2804 if (gimple_assign_rhs_code (use_stmt
) != code
)
2806 if (code
== PLUS_EXPR
2807 && gimple_assign_rhs_code (use_stmt
) == MINUS_EXPR
)
2809 /* Track whether we negate the reduction value each iteration. */
2810 if (gimple_assign_rhs2 (use_stmt
) == op
)
2820 return ! fail
&& ! neg
;
2824 /* Function vect_is_simple_reduction
2826 (1) Detect a cross-iteration def-use cycle that represents a simple
2827 reduction computation. We look for the following pattern:
2832 a2 = operation (a3, a1)
2839 a2 = operation (a3, a1)
2842 1. operation is commutative and associative and it is safe to
2843 change the order of the computation
2844 2. no uses for a2 in the loop (a2 is used out of the loop)
2845 3. no uses of a1 in the loop besides the reduction operation
2846 4. no uses of a1 outside the loop.
2848 Conditions 1,4 are tested here.
2849 Conditions 2,3 are tested in vect_mark_stmts_to_be_vectorized.
2851 (2) Detect a cross-iteration def-use cycle in nested loops, i.e.,
2854 (3) Detect cycles of phi nodes in outer-loop vectorization, i.e., double
2858 inner loop (def of a3)
2861 (4) Detect condition expressions, ie:
2862 for (int i = 0; i < N; i++)
2868 static stmt_vec_info
2869 vect_is_simple_reduction (loop_vec_info loop_info
, stmt_vec_info phi_info
,
2871 bool need_wrapping_integral_overflow
,
2872 enum vect_reduction_type
*v_reduc_type
)
2874 gphi
*phi
= as_a
<gphi
*> (phi_info
->stmt
);
2875 struct loop
*loop
= (gimple_bb (phi
))->loop_father
;
2876 struct loop
*vect_loop
= LOOP_VINFO_LOOP (loop_info
);
2877 gimple
*phi_use_stmt
= NULL
;
2878 enum tree_code orig_code
, code
;
2879 tree op1
, op2
, op3
= NULL_TREE
, op4
= NULL_TREE
;
2883 imm_use_iterator imm_iter
;
2884 use_operand_p use_p
;
2887 *double_reduc
= false;
2888 *v_reduc_type
= TREE_CODE_REDUCTION
;
2890 tree phi_name
= PHI_RESULT (phi
);
2891 /* ??? If there are no uses of the PHI result the inner loop reduction
2892 won't be detected as possibly double-reduction by vectorizable_reduction
2893 because that tries to walk the PHI arg from the preheader edge which
2894 can be constant. See PR60382. */
2895 if (has_zero_uses (phi_name
))
2898 FOR_EACH_IMM_USE_FAST (use_p
, imm_iter
, phi_name
)
2900 gimple
*use_stmt
= USE_STMT (use_p
);
2901 if (is_gimple_debug (use_stmt
))
2904 if (!flow_bb_inside_loop_p (loop
, gimple_bb (use_stmt
)))
2906 if (dump_enabled_p ())
2907 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
2908 "intermediate value used outside loop.\n");
2916 if (dump_enabled_p ())
2917 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
2918 "reduction value used in loop.\n");
2922 phi_use_stmt
= use_stmt
;
2925 edge latch_e
= loop_latch_edge (loop
);
2926 tree loop_arg
= PHI_ARG_DEF_FROM_EDGE (phi
, latch_e
);
2927 if (TREE_CODE (loop_arg
) != SSA_NAME
)
2929 if (dump_enabled_p ())
2931 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
2932 "reduction: not ssa_name: ");
2933 dump_generic_expr (MSG_MISSED_OPTIMIZATION
, TDF_SLIM
, loop_arg
);
2934 dump_printf (MSG_MISSED_OPTIMIZATION
, "\n");
2939 stmt_vec_info def_stmt_info
= loop_info
->lookup_def (loop_arg
);
2943 if (gassign
*def_stmt
= dyn_cast
<gassign
*> (def_stmt_info
->stmt
))
2945 name
= gimple_assign_lhs (def_stmt
);
2948 else if (gphi
*def_stmt
= dyn_cast
<gphi
*> (def_stmt_info
->stmt
))
2950 name
= PHI_RESULT (def_stmt
);
2955 if (dump_enabled_p ())
2957 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
2958 "reduction: unhandled reduction operation: ");
2959 dump_gimple_stmt (MSG_MISSED_OPTIMIZATION
, TDF_SLIM
,
2960 def_stmt_info
->stmt
, 0);
2966 auto_vec
<gphi
*, 3> lcphis
;
2967 FOR_EACH_IMM_USE_FAST (use_p
, imm_iter
, name
)
2969 gimple
*use_stmt
= USE_STMT (use_p
);
2970 if (is_gimple_debug (use_stmt
))
2972 if (flow_bb_inside_loop_p (loop
, gimple_bb (use_stmt
)))
2975 /* We can have more than one loop-closed PHI. */
2976 lcphis
.safe_push (as_a
<gphi
*> (use_stmt
));
2979 if (dump_enabled_p ())
2980 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
2981 "reduction used in loop.\n");
2986 /* If DEF_STMT is a phi node itself, we expect it to have a single argument
2987 defined in the inner loop. */
2990 gphi
*def_stmt
= as_a
<gphi
*> (def_stmt_info
->stmt
);
2991 op1
= PHI_ARG_DEF (def_stmt
, 0);
2993 if (gimple_phi_num_args (def_stmt
) != 1
2994 || TREE_CODE (op1
) != SSA_NAME
)
2996 if (dump_enabled_p ())
2997 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
2998 "unsupported phi node definition.\n");
3003 gimple
*def1
= SSA_NAME_DEF_STMT (op1
);
3004 if (gimple_bb (def1
)
3005 && flow_bb_inside_loop_p (loop
, gimple_bb (def_stmt
))
3007 && flow_bb_inside_loop_p (loop
->inner
, gimple_bb (def1
))
3008 && is_gimple_assign (def1
)
3009 && flow_bb_inside_loop_p (loop
->inner
, gimple_bb (phi_use_stmt
)))
3011 if (dump_enabled_p ())
3012 report_vect_op (MSG_NOTE
, def_stmt
,
3013 "detected double reduction: ");
3015 *double_reduc
= true;
3016 return def_stmt_info
;
3022 /* If we are vectorizing an inner reduction we are executing that
3023 in the original order only in case we are not dealing with a
3024 double reduction. */
3025 bool check_reduction
= true;
3026 if (flow_loop_nested_p (vect_loop
, loop
))
3030 check_reduction
= false;
3031 FOR_EACH_VEC_ELT (lcphis
, i
, lcphi
)
3032 FOR_EACH_IMM_USE_FAST (use_p
, imm_iter
, gimple_phi_result (lcphi
))
3034 gimple
*use_stmt
= USE_STMT (use_p
);
3035 if (is_gimple_debug (use_stmt
))
3037 if (! flow_bb_inside_loop_p (vect_loop
, gimple_bb (use_stmt
)))
3038 check_reduction
= true;
3042 gassign
*def_stmt
= as_a
<gassign
*> (def_stmt_info
->stmt
);
3043 bool nested_in_vect_loop
= flow_loop_nested_p (vect_loop
, loop
);
3044 code
= orig_code
= gimple_assign_rhs_code (def_stmt
);
3046 /* We can handle "res -= x[i]", which is non-associative by
3047 simply rewriting this into "res += -x[i]". Avoid changing
3048 gimple instruction for the first simple tests and only do this
3049 if we're allowed to change code at all. */
3050 if (code
== MINUS_EXPR
&& gimple_assign_rhs2 (def_stmt
) != phi_name
)
3053 if (code
== COND_EXPR
)
3055 if (! nested_in_vect_loop
)
3056 *v_reduc_type
= COND_REDUCTION
;
3058 op3
= gimple_assign_rhs1 (def_stmt
);
3059 if (COMPARISON_CLASS_P (op3
))
3061 op4
= TREE_OPERAND (op3
, 1);
3062 op3
= TREE_OPERAND (op3
, 0);
3064 if (op3
== phi_name
|| op4
== phi_name
)
3066 if (dump_enabled_p ())
3067 report_vect_op (MSG_MISSED_OPTIMIZATION
, def_stmt
,
3068 "reduction: condition depends on previous"
3073 op1
= gimple_assign_rhs2 (def_stmt
);
3074 op2
= gimple_assign_rhs3 (def_stmt
);
3076 else if (!commutative_tree_code (code
) || !associative_tree_code (code
))
3078 if (dump_enabled_p ())
3079 report_vect_op (MSG_MISSED_OPTIMIZATION
, def_stmt
,
3080 "reduction: not commutative/associative: ");
3083 else if (get_gimple_rhs_class (code
) == GIMPLE_BINARY_RHS
)
3085 op1
= gimple_assign_rhs1 (def_stmt
);
3086 op2
= gimple_assign_rhs2 (def_stmt
);
3090 if (dump_enabled_p ())
3091 report_vect_op (MSG_MISSED_OPTIMIZATION
, def_stmt
,
3092 "reduction: not handled operation: ");
3096 if (TREE_CODE (op1
) != SSA_NAME
&& TREE_CODE (op2
) != SSA_NAME
)
3098 if (dump_enabled_p ())
3099 report_vect_op (MSG_MISSED_OPTIMIZATION
, def_stmt
,
3100 "reduction: both uses not ssa_names: ");
3105 type
= TREE_TYPE (gimple_assign_lhs (def_stmt
));
3106 if ((TREE_CODE (op1
) == SSA_NAME
3107 && !types_compatible_p (type
,TREE_TYPE (op1
)))
3108 || (TREE_CODE (op2
) == SSA_NAME
3109 && !types_compatible_p (type
, TREE_TYPE (op2
)))
3110 || (op3
&& TREE_CODE (op3
) == SSA_NAME
3111 && !types_compatible_p (type
, TREE_TYPE (op3
)))
3112 || (op4
&& TREE_CODE (op4
) == SSA_NAME
3113 && !types_compatible_p (type
, TREE_TYPE (op4
))))
3115 if (dump_enabled_p ())
3117 dump_printf_loc (MSG_NOTE
, vect_location
,
3118 "reduction: multiple types: operation type: ");
3119 dump_generic_expr (MSG_NOTE
, TDF_SLIM
, type
);
3120 dump_printf (MSG_NOTE
, ", operands types: ");
3121 dump_generic_expr (MSG_NOTE
, TDF_SLIM
,
3123 dump_printf (MSG_NOTE
, ",");
3124 dump_generic_expr (MSG_NOTE
, TDF_SLIM
,
3128 dump_printf (MSG_NOTE
, ",");
3129 dump_generic_expr (MSG_NOTE
, TDF_SLIM
,
3135 dump_printf (MSG_NOTE
, ",");
3136 dump_generic_expr (MSG_NOTE
, TDF_SLIM
,
3139 dump_printf (MSG_NOTE
, "\n");
3145 /* Check whether it's ok to change the order of the computation.
3146 Generally, when vectorizing a reduction we change the order of the
3147 computation. This may change the behavior of the program in some
3148 cases, so we need to check that this is ok. One exception is when
3149 vectorizing an outer-loop: the inner-loop is executed sequentially,
3150 and therefore vectorizing reductions in the inner-loop during
3151 outer-loop vectorization is safe. */
3153 && *v_reduc_type
== TREE_CODE_REDUCTION
3154 && needs_fold_left_reduction_p (type
, code
,
3155 need_wrapping_integral_overflow
))
3156 *v_reduc_type
= FOLD_LEFT_REDUCTION
;
3158 /* Reduction is safe. We're dealing with one of the following:
3159 1) integer arithmetic and no trapv
3160 2) floating point arithmetic, and special flags permit this optimization
3161 3) nested cycle (i.e., outer loop vectorization). */
3162 stmt_vec_info def1_info
= loop_info
->lookup_def (op1
);
3163 stmt_vec_info def2_info
= loop_info
->lookup_def (op2
);
3164 if (code
!= COND_EXPR
&& !def1_info
&& !def2_info
)
3166 if (dump_enabled_p ())
3167 report_vect_op (MSG_NOTE
, def_stmt
, "reduction: no defs for operands: ");
3171 /* Check that one def is the reduction def, defined by PHI,
3172 the other def is either defined in the loop ("vect_internal_def"),
3173 or it's an induction (defined by a loop-header phi-node). */
3176 && def2_info
->stmt
== phi
3177 && (code
== COND_EXPR
3179 || vect_valid_reduction_input_p (def1_info
)))
3181 if (dump_enabled_p ())
3182 report_vect_op (MSG_NOTE
, def_stmt
, "detected reduction: ");
3183 return def_stmt_info
;
3187 && def1_info
->stmt
== phi
3188 && (code
== COND_EXPR
3190 || vect_valid_reduction_input_p (def2_info
)))
3192 if (! nested_in_vect_loop
&& orig_code
!= MINUS_EXPR
)
3194 /* Check if we can swap operands (just for simplicity - so that
3195 the rest of the code can assume that the reduction variable
3196 is always the last (second) argument). */
3197 if (code
== COND_EXPR
)
3199 /* Swap cond_expr by inverting the condition. */
3200 tree cond_expr
= gimple_assign_rhs1 (def_stmt
);
3201 enum tree_code invert_code
= ERROR_MARK
;
3202 enum tree_code cond_code
= TREE_CODE (cond_expr
);
3204 if (TREE_CODE_CLASS (cond_code
) == tcc_comparison
)
3206 bool honor_nans
= HONOR_NANS (TREE_OPERAND (cond_expr
, 0));
3207 invert_code
= invert_tree_comparison (cond_code
, honor_nans
);
3209 if (invert_code
!= ERROR_MARK
)
3211 TREE_SET_CODE (cond_expr
, invert_code
);
3212 swap_ssa_operands (def_stmt
,
3213 gimple_assign_rhs2_ptr (def_stmt
),
3214 gimple_assign_rhs3_ptr (def_stmt
));
3218 if (dump_enabled_p ())
3219 report_vect_op (MSG_NOTE
, def_stmt
,
3220 "detected reduction: cannot swap operands "
3226 swap_ssa_operands (def_stmt
, gimple_assign_rhs1_ptr (def_stmt
),
3227 gimple_assign_rhs2_ptr (def_stmt
));
3229 if (dump_enabled_p ())
3230 report_vect_op (MSG_NOTE
, def_stmt
,
3231 "detected reduction: need to swap operands: ");
3233 if (CONSTANT_CLASS_P (gimple_assign_rhs1 (def_stmt
)))
3234 LOOP_VINFO_OPERANDS_SWAPPED (loop_info
) = true;
3238 if (dump_enabled_p ())
3239 report_vect_op (MSG_NOTE
, def_stmt
, "detected reduction: ");
3242 return def_stmt_info
;
3245 /* Try to find SLP reduction chain. */
3246 if (! nested_in_vect_loop
3247 && code
!= COND_EXPR
3248 && orig_code
!= MINUS_EXPR
3249 && vect_is_slp_reduction (loop_info
, phi
, def_stmt
))
3251 if (dump_enabled_p ())
3252 report_vect_op (MSG_NOTE
, def_stmt
,
3253 "reduction: detected reduction chain: ");
3255 return def_stmt_info
;
3258 /* Dissolve group eventually half-built by vect_is_slp_reduction. */
3259 stmt_vec_info first
= REDUC_GROUP_FIRST_ELEMENT (vinfo_for_stmt (def_stmt
));
3262 stmt_vec_info next
= REDUC_GROUP_NEXT_ELEMENT (first
);
3263 REDUC_GROUP_FIRST_ELEMENT (first
) = NULL
;
3264 REDUC_GROUP_NEXT_ELEMENT (first
) = NULL
;
3268 /* Look for the expression computing loop_arg from loop PHI result. */
3269 if (check_reduction_path (vect_location
, loop
, phi
, loop_arg
, code
))
3270 return def_stmt_info
;
3272 if (dump_enabled_p ())
3274 report_vect_op (MSG_MISSED_OPTIMIZATION
, def_stmt
,
3275 "reduction: unknown pattern: ");
3281 /* Wrapper around vect_is_simple_reduction, which will modify code
3282 in-place if it enables detection of more reductions. Arguments
3286 vect_force_simple_reduction (loop_vec_info loop_info
, stmt_vec_info phi_info
,
3288 bool need_wrapping_integral_overflow
)
3290 enum vect_reduction_type v_reduc_type
;
3291 stmt_vec_info def_info
3292 = vect_is_simple_reduction (loop_info
, phi_info
, double_reduc
,
3293 need_wrapping_integral_overflow
,
3297 STMT_VINFO_REDUC_TYPE (phi_info
) = v_reduc_type
;
3298 STMT_VINFO_REDUC_DEF (phi_info
) = def_info
;
3299 STMT_VINFO_REDUC_TYPE (def_info
) = v_reduc_type
;
3300 STMT_VINFO_REDUC_DEF (def_info
) = phi_info
;
3305 /* Calculate cost of peeling the loop PEEL_ITERS_PROLOGUE times. */
3307 vect_get_known_peeling_cost (loop_vec_info loop_vinfo
, int peel_iters_prologue
,
3308 int *peel_iters_epilogue
,
3309 stmt_vector_for_cost
*scalar_cost_vec
,
3310 stmt_vector_for_cost
*prologue_cost_vec
,
3311 stmt_vector_for_cost
*epilogue_cost_vec
)
3314 int assumed_vf
= vect_vf_for_cost (loop_vinfo
);
3316 if (!LOOP_VINFO_NITERS_KNOWN_P (loop_vinfo
))
3318 *peel_iters_epilogue
= assumed_vf
/ 2;
3319 if (dump_enabled_p ())
3320 dump_printf_loc (MSG_NOTE
, vect_location
,
3321 "cost model: epilogue peel iters set to vf/2 "
3322 "because loop iterations are unknown .\n");
3324 /* If peeled iterations are known but number of scalar loop
3325 iterations are unknown, count a taken branch per peeled loop. */
3326 retval
= record_stmt_cost (prologue_cost_vec
, 1, cond_branch_taken
,
3327 NULL
, 0, vect_prologue
);
3328 retval
= record_stmt_cost (prologue_cost_vec
, 1, cond_branch_taken
,
3329 NULL
, 0, vect_epilogue
);
3333 int niters
= LOOP_VINFO_INT_NITERS (loop_vinfo
);
3334 peel_iters_prologue
= niters
< peel_iters_prologue
?
3335 niters
: peel_iters_prologue
;
3336 *peel_iters_epilogue
= (niters
- peel_iters_prologue
) % assumed_vf
;
3337 /* If we need to peel for gaps, but no peeling is required, we have to
3338 peel VF iterations. */
3339 if (LOOP_VINFO_PEELING_FOR_GAPS (loop_vinfo
) && !*peel_iters_epilogue
)
3340 *peel_iters_epilogue
= assumed_vf
;
3343 stmt_info_for_cost
*si
;
3345 if (peel_iters_prologue
)
3346 FOR_EACH_VEC_ELT (*scalar_cost_vec
, j
, si
)
3348 stmt_vec_info stmt_info
3349 = si
->stmt
? vinfo_for_stmt (si
->stmt
) : NULL_STMT_VEC_INFO
;
3350 retval
+= record_stmt_cost (prologue_cost_vec
,
3351 si
->count
* peel_iters_prologue
,
3352 si
->kind
, stmt_info
, si
->misalign
,
3355 if (*peel_iters_epilogue
)
3356 FOR_EACH_VEC_ELT (*scalar_cost_vec
, j
, si
)
3358 stmt_vec_info stmt_info
3359 = si
->stmt
? vinfo_for_stmt (si
->stmt
) : NULL_STMT_VEC_INFO
;
3360 retval
+= record_stmt_cost (epilogue_cost_vec
,
3361 si
->count
* *peel_iters_epilogue
,
3362 si
->kind
, stmt_info
, si
->misalign
,
3369 /* Function vect_estimate_min_profitable_iters
3371 Return the number of iterations required for the vector version of the
3372 loop to be profitable relative to the cost of the scalar version of the
3375 *RET_MIN_PROFITABLE_NITERS is a cost model profitability threshold
3376 of iterations for vectorization. -1 value means loop vectorization
3377 is not profitable. This returned value may be used for dynamic
3378 profitability check.
3380 *RET_MIN_PROFITABLE_ESTIMATE is a profitability threshold to be used
3381 for static check against estimated number of iterations. */
3384 vect_estimate_min_profitable_iters (loop_vec_info loop_vinfo
,
3385 int *ret_min_profitable_niters
,
3386 int *ret_min_profitable_estimate
)
3388 int min_profitable_iters
;
3389 int min_profitable_estimate
;
3390 int peel_iters_prologue
;
3391 int peel_iters_epilogue
;
3392 unsigned vec_inside_cost
= 0;
3393 int vec_outside_cost
= 0;
3394 unsigned vec_prologue_cost
= 0;
3395 unsigned vec_epilogue_cost
= 0;
3396 int scalar_single_iter_cost
= 0;
3397 int scalar_outside_cost
= 0;
3398 int assumed_vf
= vect_vf_for_cost (loop_vinfo
);
3399 int npeel
= LOOP_VINFO_PEELING_FOR_ALIGNMENT (loop_vinfo
);
3400 void *target_cost_data
= LOOP_VINFO_TARGET_COST_DATA (loop_vinfo
);
3402 /* Cost model disabled. */
3403 if (unlimited_cost_model (LOOP_VINFO_LOOP (loop_vinfo
)))
3405 dump_printf_loc (MSG_NOTE
, vect_location
, "cost model disabled.\n");
3406 *ret_min_profitable_niters
= 0;
3407 *ret_min_profitable_estimate
= 0;
3411 /* Requires loop versioning tests to handle misalignment. */
3412 if (LOOP_REQUIRES_VERSIONING_FOR_ALIGNMENT (loop_vinfo
))
3414 /* FIXME: Make cost depend on complexity of individual check. */
3415 unsigned len
= LOOP_VINFO_MAY_MISALIGN_STMTS (loop_vinfo
).length ();
3416 (void) add_stmt_cost (target_cost_data
, len
, vector_stmt
, NULL
, 0,
3418 dump_printf (MSG_NOTE
,
3419 "cost model: Adding cost of checks for loop "
3420 "versioning to treat misalignment.\n");
3423 /* Requires loop versioning with alias checks. */
3424 if (LOOP_REQUIRES_VERSIONING_FOR_ALIAS (loop_vinfo
))
3426 /* FIXME: Make cost depend on complexity of individual check. */
3427 unsigned len
= LOOP_VINFO_COMP_ALIAS_DDRS (loop_vinfo
).length ();
3428 (void) add_stmt_cost (target_cost_data
, len
, vector_stmt
, NULL
, 0,
3430 len
= LOOP_VINFO_CHECK_UNEQUAL_ADDRS (loop_vinfo
).length ();
3432 /* Count LEN - 1 ANDs and LEN comparisons. */
3433 (void) add_stmt_cost (target_cost_data
, len
* 2 - 1, scalar_stmt
,
3434 NULL
, 0, vect_prologue
);
3435 len
= LOOP_VINFO_LOWER_BOUNDS (loop_vinfo
).length ();
3438 /* Count LEN - 1 ANDs and LEN comparisons. */
3439 unsigned int nstmts
= len
* 2 - 1;
3440 /* +1 for each bias that needs adding. */
3441 for (unsigned int i
= 0; i
< len
; ++i
)
3442 if (!LOOP_VINFO_LOWER_BOUNDS (loop_vinfo
)[i
].unsigned_p
)
3444 (void) add_stmt_cost (target_cost_data
, nstmts
, scalar_stmt
,
3445 NULL
, 0, vect_prologue
);
3447 dump_printf (MSG_NOTE
,
3448 "cost model: Adding cost of checks for loop "
3449 "versioning aliasing.\n");
3452 /* Requires loop versioning with niter checks. */
3453 if (LOOP_REQUIRES_VERSIONING_FOR_NITERS (loop_vinfo
))
3455 /* FIXME: Make cost depend on complexity of individual check. */
3456 (void) add_stmt_cost (target_cost_data
, 1, vector_stmt
, NULL
, 0,
3458 dump_printf (MSG_NOTE
,
3459 "cost model: Adding cost of checks for loop "
3460 "versioning niters.\n");
3463 if (LOOP_REQUIRES_VERSIONING (loop_vinfo
))
3464 (void) add_stmt_cost (target_cost_data
, 1, cond_branch_taken
, NULL
, 0,
3467 /* Count statements in scalar loop. Using this as scalar cost for a single
3470 TODO: Add outer loop support.
3472 TODO: Consider assigning different costs to different scalar
3475 scalar_single_iter_cost
3476 = LOOP_VINFO_SINGLE_SCALAR_ITERATION_COST (loop_vinfo
);
3478 /* Add additional cost for the peeled instructions in prologue and epilogue
3479 loop. (For fully-masked loops there will be no peeling.)
3481 FORNOW: If we don't know the value of peel_iters for prologue or epilogue
3482 at compile-time - we assume it's vf/2 (the worst would be vf-1).
3484 TODO: Build an expression that represents peel_iters for prologue and
3485 epilogue to be used in a run-time test. */
3487 if (LOOP_VINFO_FULLY_MASKED_P (loop_vinfo
))
3489 peel_iters_prologue
= 0;
3490 peel_iters_epilogue
= 0;
3492 if (LOOP_VINFO_PEELING_FOR_GAPS (loop_vinfo
))
3494 /* We need to peel exactly one iteration. */
3495 peel_iters_epilogue
+= 1;
3496 stmt_info_for_cost
*si
;
3498 FOR_EACH_VEC_ELT (LOOP_VINFO_SCALAR_ITERATION_COST (loop_vinfo
),
3501 struct _stmt_vec_info
*stmt_info
3502 = si
->stmt
? vinfo_for_stmt (si
->stmt
) : NULL_STMT_VEC_INFO
;
3503 (void) add_stmt_cost (target_cost_data
, si
->count
,
3504 si
->kind
, stmt_info
, si
->misalign
,
3511 peel_iters_prologue
= assumed_vf
/ 2;
3512 dump_printf (MSG_NOTE
, "cost model: "
3513 "prologue peel iters set to vf/2.\n");
3515 /* If peeling for alignment is unknown, loop bound of main loop becomes
3517 peel_iters_epilogue
= assumed_vf
/ 2;
3518 dump_printf (MSG_NOTE
, "cost model: "
3519 "epilogue peel iters set to vf/2 because "
3520 "peeling for alignment is unknown.\n");
3522 /* If peeled iterations are unknown, count a taken branch and a not taken
3523 branch per peeled loop. Even if scalar loop iterations are known,
3524 vector iterations are not known since peeled prologue iterations are
3525 not known. Hence guards remain the same. */
3526 (void) add_stmt_cost (target_cost_data
, 1, cond_branch_taken
,
3527 NULL
, 0, vect_prologue
);
3528 (void) add_stmt_cost (target_cost_data
, 1, cond_branch_not_taken
,
3529 NULL
, 0, vect_prologue
);
3530 (void) add_stmt_cost (target_cost_data
, 1, cond_branch_taken
,
3531 NULL
, 0, vect_epilogue
);
3532 (void) add_stmt_cost (target_cost_data
, 1, cond_branch_not_taken
,
3533 NULL
, 0, vect_epilogue
);
3534 stmt_info_for_cost
*si
;
3536 FOR_EACH_VEC_ELT (LOOP_VINFO_SCALAR_ITERATION_COST (loop_vinfo
), j
, si
)
3538 struct _stmt_vec_info
*stmt_info
3539 = si
->stmt
? vinfo_for_stmt (si
->stmt
) : NULL_STMT_VEC_INFO
;
3540 (void) add_stmt_cost (target_cost_data
,
3541 si
->count
* peel_iters_prologue
,
3542 si
->kind
, stmt_info
, si
->misalign
,
3544 (void) add_stmt_cost (target_cost_data
,
3545 si
->count
* peel_iters_epilogue
,
3546 si
->kind
, stmt_info
, si
->misalign
,
3552 stmt_vector_for_cost prologue_cost_vec
, epilogue_cost_vec
;
3553 stmt_info_for_cost
*si
;
3555 void *data
= LOOP_VINFO_TARGET_COST_DATA (loop_vinfo
);
3557 prologue_cost_vec
.create (2);
3558 epilogue_cost_vec
.create (2);
3559 peel_iters_prologue
= npeel
;
3561 (void) vect_get_known_peeling_cost (loop_vinfo
, peel_iters_prologue
,
3562 &peel_iters_epilogue
,
3563 &LOOP_VINFO_SCALAR_ITERATION_COST
3566 &epilogue_cost_vec
);
3568 FOR_EACH_VEC_ELT (prologue_cost_vec
, j
, si
)
3570 struct _stmt_vec_info
*stmt_info
3571 = si
->stmt
? vinfo_for_stmt (si
->stmt
) : NULL_STMT_VEC_INFO
;
3572 (void) add_stmt_cost (data
, si
->count
, si
->kind
, stmt_info
,
3573 si
->misalign
, vect_prologue
);
3576 FOR_EACH_VEC_ELT (epilogue_cost_vec
, j
, si
)
3578 struct _stmt_vec_info
*stmt_info
3579 = si
->stmt
? vinfo_for_stmt (si
->stmt
) : NULL_STMT_VEC_INFO
;
3580 (void) add_stmt_cost (data
, si
->count
, si
->kind
, stmt_info
,
3581 si
->misalign
, vect_epilogue
);
3584 prologue_cost_vec
.release ();
3585 epilogue_cost_vec
.release ();
3588 /* FORNOW: The scalar outside cost is incremented in one of the
3591 1. The vectorizer checks for alignment and aliasing and generates
3592 a condition that allows dynamic vectorization. A cost model
3593 check is ANDED with the versioning condition. Hence scalar code
3594 path now has the added cost of the versioning check.
3596 if (cost > th & versioning_check)
3599 Hence run-time scalar is incremented by not-taken branch cost.
3601 2. The vectorizer then checks if a prologue is required. If the
3602 cost model check was not done before during versioning, it has to
3603 be done before the prologue check.
3606 prologue = scalar_iters
3611 if (prologue == num_iters)
3614 Hence the run-time scalar cost is incremented by a taken branch,
3615 plus a not-taken branch, plus a taken branch cost.
3617 3. The vectorizer then checks if an epilogue is required. If the
3618 cost model check was not done before during prologue check, it
3619 has to be done with the epilogue check.
3625 if (prologue == num_iters)
3628 if ((cost <= th) | (scalar_iters-prologue-epilogue == 0))
3631 Hence the run-time scalar cost should be incremented by 2 taken
3634 TODO: The back end may reorder the BBS's differently and reverse
3635 conditions/branch directions. Change the estimates below to
3636 something more reasonable. */
3638 /* If the number of iterations is known and we do not do versioning, we can
3639 decide whether to vectorize at compile time. Hence the scalar version
3640 do not carry cost model guard costs. */
3641 if (!LOOP_VINFO_NITERS_KNOWN_P (loop_vinfo
)
3642 || LOOP_REQUIRES_VERSIONING (loop_vinfo
))
3644 /* Cost model check occurs at versioning. */
3645 if (LOOP_REQUIRES_VERSIONING (loop_vinfo
))
3646 scalar_outside_cost
+= vect_get_stmt_cost (cond_branch_not_taken
);
3649 /* Cost model check occurs at prologue generation. */
3650 if (LOOP_VINFO_PEELING_FOR_ALIGNMENT (loop_vinfo
) < 0)
3651 scalar_outside_cost
+= 2 * vect_get_stmt_cost (cond_branch_taken
)
3652 + vect_get_stmt_cost (cond_branch_not_taken
);
3653 /* Cost model check occurs at epilogue generation. */
3655 scalar_outside_cost
+= 2 * vect_get_stmt_cost (cond_branch_taken
);
3659 /* Complete the target-specific cost calculations. */
3660 finish_cost (LOOP_VINFO_TARGET_COST_DATA (loop_vinfo
), &vec_prologue_cost
,
3661 &vec_inside_cost
, &vec_epilogue_cost
);
3663 vec_outside_cost
= (int)(vec_prologue_cost
+ vec_epilogue_cost
);
3665 if (dump_enabled_p ())
3667 dump_printf_loc (MSG_NOTE
, vect_location
, "Cost model analysis: \n");
3668 dump_printf (MSG_NOTE
, " Vector inside of loop cost: %d\n",
3670 dump_printf (MSG_NOTE
, " Vector prologue cost: %d\n",
3672 dump_printf (MSG_NOTE
, " Vector epilogue cost: %d\n",
3674 dump_printf (MSG_NOTE
, " Scalar iteration cost: %d\n",
3675 scalar_single_iter_cost
);
3676 dump_printf (MSG_NOTE
, " Scalar outside cost: %d\n",
3677 scalar_outside_cost
);
3678 dump_printf (MSG_NOTE
, " Vector outside cost: %d\n",
3680 dump_printf (MSG_NOTE
, " prologue iterations: %d\n",
3681 peel_iters_prologue
);
3682 dump_printf (MSG_NOTE
, " epilogue iterations: %d\n",
3683 peel_iters_epilogue
);
3686 /* Calculate number of iterations required to make the vector version
3687 profitable, relative to the loop bodies only. The following condition
3689 SIC * niters + SOC > VIC * ((niters-PL_ITERS-EP_ITERS)/VF) + VOC
3691 SIC = scalar iteration cost, VIC = vector iteration cost,
3692 VOC = vector outside cost, VF = vectorization factor,
3693 PL_ITERS = prologue iterations, EP_ITERS= epilogue iterations
3694 SOC = scalar outside cost for run time cost model check. */
3696 if ((scalar_single_iter_cost
* assumed_vf
) > (int) vec_inside_cost
)
3698 min_profitable_iters
= ((vec_outside_cost
- scalar_outside_cost
)
3700 - vec_inside_cost
* peel_iters_prologue
3701 - vec_inside_cost
* peel_iters_epilogue
);
3702 if (min_profitable_iters
<= 0)
3703 min_profitable_iters
= 0;
3706 min_profitable_iters
/= ((scalar_single_iter_cost
* assumed_vf
)
3709 if ((scalar_single_iter_cost
* assumed_vf
* min_profitable_iters
)
3710 <= (((int) vec_inside_cost
* min_profitable_iters
)
3711 + (((int) vec_outside_cost
- scalar_outside_cost
)
3713 min_profitable_iters
++;
3716 /* vector version will never be profitable. */
3719 if (LOOP_VINFO_LOOP (loop_vinfo
)->force_vectorize
)
3720 warning_at (vect_location
.get_location_t (), OPT_Wopenmp_simd
,
3721 "vectorization did not happen for a simd loop");
3723 if (dump_enabled_p ())
3724 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
3725 "cost model: the vector iteration cost = %d "
3726 "divided by the scalar iteration cost = %d "
3727 "is greater or equal to the vectorization factor = %d"
3729 vec_inside_cost
, scalar_single_iter_cost
, assumed_vf
);
3730 *ret_min_profitable_niters
= -1;
3731 *ret_min_profitable_estimate
= -1;
3735 dump_printf (MSG_NOTE
,
3736 " Calculated minimum iters for profitability: %d\n",
3737 min_profitable_iters
);
3739 if (!LOOP_VINFO_FULLY_MASKED_P (loop_vinfo
)
3740 && min_profitable_iters
< (assumed_vf
+ peel_iters_prologue
))
3741 /* We want the vectorized loop to execute at least once. */
3742 min_profitable_iters
= assumed_vf
+ peel_iters_prologue
;
3744 if (dump_enabled_p ())
3745 dump_printf_loc (MSG_NOTE
, vect_location
,
3746 " Runtime profitability threshold = %d\n",
3747 min_profitable_iters
);
3749 *ret_min_profitable_niters
= min_profitable_iters
;
3751 /* Calculate number of iterations required to make the vector version
3752 profitable, relative to the loop bodies only.
3754 Non-vectorized variant is SIC * niters and it must win over vector
3755 variant on the expected loop trip count. The following condition must hold true:
3756 SIC * niters > VIC * ((niters-PL_ITERS-EP_ITERS)/VF) + VOC + SOC */
3758 if (vec_outside_cost
<= 0)
3759 min_profitable_estimate
= 0;
3762 min_profitable_estimate
= ((vec_outside_cost
+ scalar_outside_cost
)
3764 - vec_inside_cost
* peel_iters_prologue
3765 - vec_inside_cost
* peel_iters_epilogue
)
3766 / ((scalar_single_iter_cost
* assumed_vf
)
3769 min_profitable_estimate
= MAX (min_profitable_estimate
, min_profitable_iters
);
3770 if (dump_enabled_p ())
3771 dump_printf_loc (MSG_NOTE
, vect_location
,
3772 " Static estimate profitability threshold = %d\n",
3773 min_profitable_estimate
);
3775 *ret_min_profitable_estimate
= min_profitable_estimate
;
3778 /* Writes into SEL a mask for a vec_perm, equivalent to a vec_shr by OFFSET
3779 vector elements (not bits) for a vector with NELT elements. */
3781 calc_vec_perm_mask_for_shift (unsigned int offset
, unsigned int nelt
,
3782 vec_perm_builder
*sel
)
3784 /* The encoding is a single stepped pattern. Any wrap-around is handled
3785 by vec_perm_indices. */
3786 sel
->new_vector (nelt
, 1, 3);
3787 for (unsigned int i
= 0; i
< 3; i
++)
3788 sel
->quick_push (i
+ offset
);
3791 /* Checks whether the target supports whole-vector shifts for vectors of mode
3792 MODE. This is the case if _either_ the platform handles vec_shr_optab, _or_
3793 it supports vec_perm_const with masks for all necessary shift amounts. */
3795 have_whole_vector_shift (machine_mode mode
)
3797 if (optab_handler (vec_shr_optab
, mode
) != CODE_FOR_nothing
)
3800 /* Variable-length vectors should be handled via the optab. */
3802 if (!GET_MODE_NUNITS (mode
).is_constant (&nelt
))
3805 vec_perm_builder sel
;
3806 vec_perm_indices indices
;
3807 for (unsigned int i
= nelt
/ 2; i
>= 1; i
/= 2)
3809 calc_vec_perm_mask_for_shift (i
, nelt
, &sel
);
3810 indices
.new_vector (sel
, 2, nelt
);
3811 if (!can_vec_perm_const_p (mode
, indices
, false))
3817 /* TODO: Close dependency between vect_model_*_cost and vectorizable_*
3818 functions. Design better to avoid maintenance issues. */
3820 /* Function vect_model_reduction_cost.
3822 Models cost for a reduction operation, including the vector ops
3823 generated within the strip-mine loop, the initial definition before
3824 the loop, and the epilogue code that must be generated. */
3827 vect_model_reduction_cost (stmt_vec_info stmt_info
, internal_fn reduc_fn
,
3828 int ncopies
, stmt_vector_for_cost
*cost_vec
)
3830 int prologue_cost
= 0, epilogue_cost
= 0, inside_cost
;
3831 enum tree_code code
;
3835 loop_vec_info loop_vinfo
= STMT_VINFO_LOOP_VINFO (stmt_info
);
3836 struct loop
*loop
= NULL
;
3839 loop
= LOOP_VINFO_LOOP (loop_vinfo
);
3841 /* Condition reductions generate two reductions in the loop. */
3842 vect_reduction_type reduction_type
3843 = STMT_VINFO_VEC_REDUCTION_TYPE (stmt_info
);
3844 if (reduction_type
== COND_REDUCTION
)
3847 vectype
= STMT_VINFO_VECTYPE (stmt_info
);
3848 mode
= TYPE_MODE (vectype
);
3849 stmt_vec_info orig_stmt_info
= STMT_VINFO_RELATED_STMT (stmt_info
);
3851 if (!orig_stmt_info
)
3852 orig_stmt_info
= stmt_info
;
3854 code
= gimple_assign_rhs_code (orig_stmt_info
->stmt
);
3856 if (reduction_type
== EXTRACT_LAST_REDUCTION
3857 || reduction_type
== FOLD_LEFT_REDUCTION
)
3859 /* No extra instructions needed in the prologue. */
3862 if (reduction_type
== EXTRACT_LAST_REDUCTION
|| reduc_fn
!= IFN_LAST
)
3863 /* Count one reduction-like operation per vector. */
3864 inside_cost
= record_stmt_cost (cost_vec
, ncopies
, vec_to_scalar
,
3865 stmt_info
, 0, vect_body
);
3868 /* Use NELEMENTS extracts and NELEMENTS scalar ops. */
3869 unsigned int nelements
= ncopies
* vect_nunits_for_cost (vectype
);
3870 inside_cost
= record_stmt_cost (cost_vec
, nelements
,
3871 vec_to_scalar
, stmt_info
, 0,
3873 inside_cost
+= record_stmt_cost (cost_vec
, nelements
,
3874 scalar_stmt
, stmt_info
, 0,
3880 /* Add in cost for initial definition.
3881 For cond reduction we have four vectors: initial index, step,
3882 initial result of the data reduction, initial value of the index
3884 int prologue_stmts
= reduction_type
== COND_REDUCTION
? 4 : 1;
3885 prologue_cost
+= record_stmt_cost (cost_vec
, prologue_stmts
,
3886 scalar_to_vec
, stmt_info
, 0,
3889 /* Cost of reduction op inside loop. */
3890 inside_cost
= record_stmt_cost (cost_vec
, ncopies
, vector_stmt
,
3891 stmt_info
, 0, vect_body
);
3894 /* Determine cost of epilogue code.
3896 We have a reduction operator that will reduce the vector in one statement.
3897 Also requires scalar extract. */
3899 if (!loop
|| !nested_in_vect_loop_p (loop
, orig_stmt_info
))
3901 if (reduc_fn
!= IFN_LAST
)
3903 if (reduction_type
== COND_REDUCTION
)
3905 /* An EQ stmt and an COND_EXPR stmt. */
3906 epilogue_cost
+= record_stmt_cost (cost_vec
, 2,
3907 vector_stmt
, stmt_info
, 0,
3909 /* Reduction of the max index and a reduction of the found
3911 epilogue_cost
+= record_stmt_cost (cost_vec
, 2,
3912 vec_to_scalar
, stmt_info
, 0,
3914 /* A broadcast of the max value. */
3915 epilogue_cost
+= record_stmt_cost (cost_vec
, 1,
3916 scalar_to_vec
, stmt_info
, 0,
3921 epilogue_cost
+= record_stmt_cost (cost_vec
, 1, vector_stmt
,
3922 stmt_info
, 0, vect_epilogue
);
3923 epilogue_cost
+= record_stmt_cost (cost_vec
, 1,
3924 vec_to_scalar
, stmt_info
, 0,
3928 else if (reduction_type
== COND_REDUCTION
)
3930 unsigned estimated_nunits
= vect_nunits_for_cost (vectype
);
3931 /* Extraction of scalar elements. */
3932 epilogue_cost
+= record_stmt_cost (cost_vec
,
3933 2 * estimated_nunits
,
3934 vec_to_scalar
, stmt_info
, 0,
3936 /* Scalar max reductions via COND_EXPR / MAX_EXPR. */
3937 epilogue_cost
+= record_stmt_cost (cost_vec
,
3938 2 * estimated_nunits
- 3,
3939 scalar_stmt
, stmt_info
, 0,
3942 else if (reduction_type
== EXTRACT_LAST_REDUCTION
3943 || reduction_type
== FOLD_LEFT_REDUCTION
)
3944 /* No extra instructions need in the epilogue. */
3948 int vec_size_in_bits
= tree_to_uhwi (TYPE_SIZE (vectype
));
3950 TYPE_SIZE (TREE_TYPE (gimple_assign_lhs (orig_stmt_info
->stmt
)));
3951 int element_bitsize
= tree_to_uhwi (bitsize
);
3952 int nelements
= vec_size_in_bits
/ element_bitsize
;
3954 if (code
== COND_EXPR
)
3957 optab
= optab_for_tree_code (code
, vectype
, optab_default
);
3959 /* We have a whole vector shift available. */
3960 if (optab
!= unknown_optab
3961 && VECTOR_MODE_P (mode
)
3962 && optab_handler (optab
, mode
) != CODE_FOR_nothing
3963 && have_whole_vector_shift (mode
))
3965 /* Final reduction via vector shifts and the reduction operator.
3966 Also requires scalar extract. */
3967 epilogue_cost
+= record_stmt_cost (cost_vec
,
3968 exact_log2 (nelements
) * 2,
3969 vector_stmt
, stmt_info
, 0,
3971 epilogue_cost
+= record_stmt_cost (cost_vec
, 1,
3972 vec_to_scalar
, stmt_info
, 0,
3976 /* Use extracts and reduction op for final reduction. For N
3977 elements, we have N extracts and N-1 reduction ops. */
3978 epilogue_cost
+= record_stmt_cost (cost_vec
,
3979 nelements
+ nelements
- 1,
3980 vector_stmt
, stmt_info
, 0,
3985 if (dump_enabled_p ())
3986 dump_printf (MSG_NOTE
,
3987 "vect_model_reduction_cost: inside_cost = %d, "
3988 "prologue_cost = %d, epilogue_cost = %d .\n", inside_cost
,
3989 prologue_cost
, epilogue_cost
);
3993 /* Function vect_model_induction_cost.
3995 Models cost for induction operations. */
3998 vect_model_induction_cost (stmt_vec_info stmt_info
, int ncopies
,
3999 stmt_vector_for_cost
*cost_vec
)
4001 unsigned inside_cost
, prologue_cost
;
4003 if (PURE_SLP_STMT (stmt_info
))
4006 /* loop cost for vec_loop. */
4007 inside_cost
= record_stmt_cost (cost_vec
, ncopies
, vector_stmt
,
4008 stmt_info
, 0, vect_body
);
4010 /* prologue cost for vec_init and vec_step. */
4011 prologue_cost
= record_stmt_cost (cost_vec
, 2, scalar_to_vec
,
4012 stmt_info
, 0, vect_prologue
);
4014 if (dump_enabled_p ())
4015 dump_printf_loc (MSG_NOTE
, vect_location
,
4016 "vect_model_induction_cost: inside_cost = %d, "
4017 "prologue_cost = %d .\n", inside_cost
, prologue_cost
);
4022 /* Function get_initial_def_for_reduction
4025 STMT - a stmt that performs a reduction operation in the loop.
4026 INIT_VAL - the initial value of the reduction variable
4029 ADJUSTMENT_DEF - a tree that holds a value to be added to the final result
4030 of the reduction (used for adjusting the epilog - see below).
4031 Return a vector variable, initialized according to the operation that STMT
4032 performs. This vector will be used as the initial value of the
4033 vector of partial results.
4035 Option1 (adjust in epilog): Initialize the vector as follows:
4036 add/bit or/xor: [0,0,...,0,0]
4037 mult/bit and: [1,1,...,1,1]
4038 min/max/cond_expr: [init_val,init_val,..,init_val,init_val]
4039 and when necessary (e.g. add/mult case) let the caller know
4040 that it needs to adjust the result by init_val.
4042 Option2: Initialize the vector as follows:
4043 add/bit or/xor: [init_val,0,0,...,0]
4044 mult/bit and: [init_val,1,1,...,1]
4045 min/max/cond_expr: [init_val,init_val,...,init_val]
4046 and no adjustments are needed.
4048 For example, for the following code:
4054 STMT is 's = s + a[i]', and the reduction variable is 's'.
4055 For a vector of 4 units, we want to return either [0,0,0,init_val],
4056 or [0,0,0,0] and let the caller know that it needs to adjust
4057 the result at the end by 'init_val'.
4059 FORNOW, we are using the 'adjust in epilog' scheme, because this way the
4060 initialization vector is simpler (same element in all entries), if
4061 ADJUSTMENT_DEF is not NULL, and Option2 otherwise.
4063 A cost model should help decide between these two schemes. */
4066 get_initial_def_for_reduction (gimple
*stmt
, tree init_val
,
4067 tree
*adjustment_def
)
4069 stmt_vec_info stmt_vinfo
= vinfo_for_stmt (stmt
);
4070 loop_vec_info loop_vinfo
= STMT_VINFO_LOOP_VINFO (stmt_vinfo
);
4071 struct loop
*loop
= LOOP_VINFO_LOOP (loop_vinfo
);
4072 tree scalar_type
= TREE_TYPE (init_val
);
4073 tree vectype
= get_vectype_for_scalar_type (scalar_type
);
4074 enum tree_code code
= gimple_assign_rhs_code (stmt
);
4077 REAL_VALUE_TYPE real_init_val
= dconst0
;
4078 int int_init_val
= 0;
4079 gimple_seq stmts
= NULL
;
4081 gcc_assert (vectype
);
4083 gcc_assert (POINTER_TYPE_P (scalar_type
) || INTEGRAL_TYPE_P (scalar_type
)
4084 || SCALAR_FLOAT_TYPE_P (scalar_type
));
4086 gcc_assert (nested_in_vect_loop_p (loop
, stmt
)
4087 || loop
== (gimple_bb (stmt
))->loop_father
);
4089 vect_reduction_type reduction_type
4090 = STMT_VINFO_VEC_REDUCTION_TYPE (stmt_vinfo
);
4094 case WIDEN_SUM_EXPR
:
4104 /* ADJUSTMENT_DEF is NULL when called from
4105 vect_create_epilog_for_reduction to vectorize double reduction. */
4107 *adjustment_def
= init_val
;
4109 if (code
== MULT_EXPR
)
4111 real_init_val
= dconst1
;
4115 if (code
== BIT_AND_EXPR
)
4118 if (SCALAR_FLOAT_TYPE_P (scalar_type
))
4119 def_for_init
= build_real (scalar_type
, real_init_val
);
4121 def_for_init
= build_int_cst (scalar_type
, int_init_val
);
4124 /* Option1: the first element is '0' or '1' as well. */
4125 init_def
= gimple_build_vector_from_val (&stmts
, vectype
,
4127 else if (!TYPE_VECTOR_SUBPARTS (vectype
).is_constant ())
4129 /* Option2 (variable length): the first element is INIT_VAL. */
4130 init_def
= gimple_build_vector_from_val (&stmts
, vectype
,
4132 init_def
= gimple_build (&stmts
, CFN_VEC_SHL_INSERT
,
4133 vectype
, init_def
, init_val
);
4137 /* Option2: the first element is INIT_VAL. */
4138 tree_vector_builder
elts (vectype
, 1, 2);
4139 elts
.quick_push (init_val
);
4140 elts
.quick_push (def_for_init
);
4141 init_def
= gimple_build_vector (&stmts
, &elts
);
4152 *adjustment_def
= NULL_TREE
;
4153 if (reduction_type
!= COND_REDUCTION
4154 && reduction_type
!= EXTRACT_LAST_REDUCTION
)
4156 init_def
= vect_get_vec_def_for_operand (init_val
, stmt
);
4160 init_val
= gimple_convert (&stmts
, TREE_TYPE (vectype
), init_val
);
4161 init_def
= gimple_build_vector_from_val (&stmts
, vectype
, init_val
);
4170 gsi_insert_seq_on_edge_immediate (loop_preheader_edge (loop
), stmts
);
4174 /* Get at the initial defs for the reduction PHIs in SLP_NODE.
4175 NUMBER_OF_VECTORS is the number of vector defs to create.
4176 If NEUTRAL_OP is nonnull, introducing extra elements of that
4177 value will not change the result. */
4180 get_initial_defs_for_reduction (slp_tree slp_node
,
4181 vec
<tree
> *vec_oprnds
,
4182 unsigned int number_of_vectors
,
4183 bool reduc_chain
, tree neutral_op
)
4185 vec
<stmt_vec_info
> stmts
= SLP_TREE_SCALAR_STMTS (slp_node
);
4186 stmt_vec_info stmt_vinfo
= stmts
[0];
4187 unsigned HOST_WIDE_INT nunits
;
4188 unsigned j
, number_of_places_left_in_vector
;
4191 int group_size
= stmts
.length ();
4192 unsigned int vec_num
, i
;
4193 unsigned number_of_copies
= 1;
4195 voprnds
.create (number_of_vectors
);
4197 auto_vec
<tree
, 16> permute_results
;
4199 vector_type
= STMT_VINFO_VECTYPE (stmt_vinfo
);
4201 gcc_assert (STMT_VINFO_DEF_TYPE (stmt_vinfo
) == vect_reduction_def
);
4203 loop
= (gimple_bb (stmt_vinfo
->stmt
))->loop_father
;
4205 edge pe
= loop_preheader_edge (loop
);
4207 gcc_assert (!reduc_chain
|| neutral_op
);
4209 /* NUMBER_OF_COPIES is the number of times we need to use the same values in
4210 created vectors. It is greater than 1 if unrolling is performed.
4212 For example, we have two scalar operands, s1 and s2 (e.g., group of
4213 strided accesses of size two), while NUNITS is four (i.e., four scalars
4214 of this type can be packed in a vector). The output vector will contain
4215 two copies of each scalar operand: {s1, s2, s1, s2}. (NUMBER_OF_COPIES
4218 If REDUC_GROUP_SIZE > NUNITS, the scalars will be split into several
4219 vectors containing the operands.
4221 For example, NUNITS is four as before, and the group size is 8
4222 (s1, s2, ..., s8). We will create two vectors {s1, s2, s3, s4} and
4223 {s5, s6, s7, s8}. */
4225 if (!TYPE_VECTOR_SUBPARTS (vector_type
).is_constant (&nunits
))
4226 nunits
= group_size
;
4228 number_of_copies
= nunits
* number_of_vectors
/ group_size
;
4230 number_of_places_left_in_vector
= nunits
;
4231 bool constant_p
= true;
4232 tree_vector_builder
elts (vector_type
, nunits
, 1);
4233 elts
.quick_grow (nunits
);
4234 for (j
= 0; j
< number_of_copies
; j
++)
4236 for (i
= group_size
- 1; stmts
.iterate (i
, &stmt_vinfo
); i
--)
4239 /* Get the def before the loop. In reduction chain we have only
4240 one initial value. */
4241 if ((j
!= (number_of_copies
- 1)
4242 || (reduc_chain
&& i
!= 0))
4246 op
= PHI_ARG_DEF_FROM_EDGE (stmt_vinfo
->stmt
, pe
);
4248 /* Create 'vect_ = {op0,op1,...,opn}'. */
4249 number_of_places_left_in_vector
--;
4250 elts
[number_of_places_left_in_vector
] = op
;
4251 if (!CONSTANT_CLASS_P (op
))
4254 if (number_of_places_left_in_vector
== 0)
4256 gimple_seq ctor_seq
= NULL
;
4258 if (constant_p
&& !neutral_op
4259 ? multiple_p (TYPE_VECTOR_SUBPARTS (vector_type
), nunits
)
4260 : known_eq (TYPE_VECTOR_SUBPARTS (vector_type
), nunits
))
4261 /* Build the vector directly from ELTS. */
4262 init
= gimple_build_vector (&ctor_seq
, &elts
);
4263 else if (neutral_op
)
4265 /* Build a vector of the neutral value and shift the
4266 other elements into place. */
4267 init
= gimple_build_vector_from_val (&ctor_seq
, vector_type
,
4270 while (k
> 0 && elts
[k
- 1] == neutral_op
)
4275 init
= gimple_build (&ctor_seq
, CFN_VEC_SHL_INSERT
,
4276 vector_type
, init
, elts
[k
]);
4281 /* First time round, duplicate ELTS to fill the
4282 required number of vectors, then cherry pick the
4283 appropriate result for each iteration. */
4284 if (vec_oprnds
->is_empty ())
4285 duplicate_and_interleave (&ctor_seq
, vector_type
, elts
,
4288 init
= permute_results
[number_of_vectors
- j
- 1];
4290 if (ctor_seq
!= NULL
)
4291 gsi_insert_seq_on_edge_immediate (pe
, ctor_seq
);
4292 voprnds
.quick_push (init
);
4294 number_of_places_left_in_vector
= nunits
;
4295 elts
.new_vector (vector_type
, nunits
, 1);
4296 elts
.quick_grow (nunits
);
4302 /* Since the vectors are created in the reverse order, we should invert
4304 vec_num
= voprnds
.length ();
4305 for (j
= vec_num
; j
!= 0; j
--)
4307 vop
= voprnds
[j
- 1];
4308 vec_oprnds
->quick_push (vop
);
4313 /* In case that VF is greater than the unrolling factor needed for the SLP
4314 group of stmts, NUMBER_OF_VECTORS to be created is greater than
4315 NUMBER_OF_SCALARS/NUNITS or NUNITS/NUMBER_OF_SCALARS, and hence we have
4316 to replicate the vectors. */
4317 tree neutral_vec
= NULL
;
4318 while (number_of_vectors
> vec_oprnds
->length ())
4324 gimple_seq ctor_seq
= NULL
;
4325 neutral_vec
= gimple_build_vector_from_val
4326 (&ctor_seq
, vector_type
, neutral_op
);
4327 if (ctor_seq
!= NULL
)
4328 gsi_insert_seq_on_edge_immediate (pe
, ctor_seq
);
4330 vec_oprnds
->quick_push (neutral_vec
);
4334 for (i
= 0; vec_oprnds
->iterate (i
, &vop
) && i
< vec_num
; i
++)
4335 vec_oprnds
->quick_push (vop
);
4341 /* Function vect_create_epilog_for_reduction
4343 Create code at the loop-epilog to finalize the result of a reduction
4346 VECT_DEFS is list of vector of partial results, i.e., the lhs's of vector
4347 reduction statements.
4348 STMT is the scalar reduction stmt that is being vectorized.
4349 NCOPIES is > 1 in case the vectorization factor (VF) is bigger than the
4350 number of elements that we can fit in a vectype (nunits). In this case
4351 we have to generate more than one vector stmt - i.e - we need to "unroll"
4352 the vector stmt by a factor VF/nunits. For more details see documentation
4353 in vectorizable_operation.
4354 REDUC_FN is the internal function for the epilog reduction.
4355 REDUCTION_PHIS is a list of the phi-nodes that carry the reduction
4357 REDUC_INDEX is the index of the operand in the right hand side of the
4358 statement that is defined by REDUCTION_PHI.
4359 DOUBLE_REDUC is TRUE if double reduction phi nodes should be handled.
4360 SLP_NODE is an SLP node containing a group of reduction statements. The
4361 first one in this group is STMT.
4362 INDUC_VAL is for INTEGER_INDUC_COND_REDUCTION the value to use for the case
4363 when the COND_EXPR is never true in the loop. For MAX_EXPR, it needs to
4364 be smaller than any value of the IV in the loop, for MIN_EXPR larger than
4365 any value of the IV in the loop.
4366 INDUC_CODE is the code for epilog reduction if INTEGER_INDUC_COND_REDUCTION.
4367 NEUTRAL_OP is the value given by neutral_op_for_slp_reduction; it is
4368 null if this is not an SLP reduction
4371 1. Creates the reduction def-use cycles: sets the arguments for
4373 The loop-entry argument is the vectorized initial-value of the reduction.
4374 The loop-latch argument is taken from VECT_DEFS - the vector of partial
4376 2. "Reduces" each vector of partial results VECT_DEFS into a single result,
4377 by calling the function specified by REDUC_FN if available, or by
4378 other means (whole-vector shifts or a scalar loop).
4379 The function also creates a new phi node at the loop exit to preserve
4380 loop-closed form, as illustrated below.
4382 The flow at the entry to this function:
4385 vec_def = phi <null, null> # REDUCTION_PHI
4386 VECT_DEF = vector_stmt # vectorized form of STMT
4387 s_loop = scalar_stmt # (scalar) STMT
4389 s_out0 = phi <s_loop> # (scalar) EXIT_PHI
4393 The above is transformed by this function into:
4396 vec_def = phi <vec_init, VECT_DEF> # REDUCTION_PHI
4397 VECT_DEF = vector_stmt # vectorized form of STMT
4398 s_loop = scalar_stmt # (scalar) STMT
4400 s_out0 = phi <s_loop> # (scalar) EXIT_PHI
4401 v_out1 = phi <VECT_DEF> # NEW_EXIT_PHI
4402 v_out2 = reduce <v_out1>
4403 s_out3 = extract_field <v_out2, 0>
4404 s_out4 = adjust_result <s_out3>
4410 vect_create_epilog_for_reduction (vec
<tree
> vect_defs
, gimple
*stmt
,
4411 gimple
*reduc_def_stmt
,
4412 int ncopies
, internal_fn reduc_fn
,
4413 vec
<stmt_vec_info
> reduction_phis
,
4416 slp_instance slp_node_instance
,
4417 tree induc_val
, enum tree_code induc_code
,
4420 stmt_vec_info stmt_info
= vinfo_for_stmt (stmt
);
4421 stmt_vec_info prev_phi_info
;
4424 loop_vec_info loop_vinfo
= STMT_VINFO_LOOP_VINFO (stmt_info
);
4425 struct loop
*loop
= LOOP_VINFO_LOOP (loop_vinfo
), *outer_loop
= NULL
;
4426 basic_block exit_bb
;
4429 gimple
*new_phi
= NULL
, *phi
;
4430 stmt_vec_info phi_info
;
4431 gimple_stmt_iterator exit_gsi
;
4433 tree new_temp
= NULL_TREE
, new_dest
, new_name
, new_scalar_dest
;
4434 gimple
*epilog_stmt
= NULL
;
4435 enum tree_code code
= gimple_assign_rhs_code (stmt
);
4438 tree adjustment_def
= NULL
;
4439 tree vec_initial_def
= NULL
;
4440 tree expr
, def
, initial_def
= NULL
;
4441 tree orig_name
, scalar_result
;
4442 imm_use_iterator imm_iter
, phi_imm_iter
;
4443 use_operand_p use_p
, phi_use_p
;
4445 stmt_vec_info reduction_phi_info
= NULL
;
4446 bool nested_in_vect_loop
= false;
4447 auto_vec
<gimple
*> new_phis
;
4448 auto_vec
<stmt_vec_info
> inner_phis
;
4449 enum vect_def_type dt
= vect_unknown_def_type
;
4451 auto_vec
<tree
> scalar_results
;
4452 unsigned int group_size
= 1, k
, ratio
;
4453 auto_vec
<tree
> vec_initial_defs
;
4454 auto_vec
<gimple
*> phis
;
4455 bool slp_reduc
= false;
4456 bool direct_slp_reduc
;
4457 tree new_phi_result
;
4458 stmt_vec_info inner_phi
= NULL
;
4459 tree induction_index
= NULL_TREE
;
4462 group_size
= SLP_TREE_SCALAR_STMTS (slp_node
).length ();
4464 if (nested_in_vect_loop_p (loop
, stmt
))
4468 nested_in_vect_loop
= true;
4469 gcc_assert (!slp_node
);
4472 vectype
= STMT_VINFO_VECTYPE (stmt_info
);
4473 gcc_assert (vectype
);
4474 mode
= TYPE_MODE (vectype
);
4476 /* 1. Create the reduction def-use cycle:
4477 Set the arguments of REDUCTION_PHIS, i.e., transform
4480 vec_def = phi <null, null> # REDUCTION_PHI
4481 VECT_DEF = vector_stmt # vectorized form of STMT
4487 vec_def = phi <vec_init, VECT_DEF> # REDUCTION_PHI
4488 VECT_DEF = vector_stmt # vectorized form of STMT
4491 (in case of SLP, do it for all the phis). */
4493 /* Get the loop-entry arguments. */
4494 enum vect_def_type initial_def_dt
= vect_unknown_def_type
;
4497 unsigned vec_num
= SLP_TREE_NUMBER_OF_VEC_STMTS (slp_node
);
4498 vec_initial_defs
.reserve (vec_num
);
4499 get_initial_defs_for_reduction (slp_node_instance
->reduc_phis
,
4500 &vec_initial_defs
, vec_num
,
4501 REDUC_GROUP_FIRST_ELEMENT (stmt_info
),
4506 /* Get at the scalar def before the loop, that defines the initial value
4507 of the reduction variable. */
4508 initial_def
= PHI_ARG_DEF_FROM_EDGE (reduc_def_stmt
,
4509 loop_preheader_edge (loop
));
4510 /* Optimize: if initial_def is for REDUC_MAX smaller than the base
4511 and we can't use zero for induc_val, use initial_def. Similarly
4512 for REDUC_MIN and initial_def larger than the base. */
4513 if (TREE_CODE (initial_def
) == INTEGER_CST
4514 && (STMT_VINFO_VEC_REDUCTION_TYPE (stmt_info
)
4515 == INTEGER_INDUC_COND_REDUCTION
)
4516 && !integer_zerop (induc_val
)
4517 && ((induc_code
== MAX_EXPR
4518 && tree_int_cst_lt (initial_def
, induc_val
))
4519 || (induc_code
== MIN_EXPR
4520 && tree_int_cst_lt (induc_val
, initial_def
))))
4521 induc_val
= initial_def
;
4524 /* In case of double reduction we only create a vector variable
4525 to be put in the reduction phi node. The actual statement
4526 creation is done later in this function. */
4527 vec_initial_def
= vect_create_destination_var (initial_def
, vectype
);
4528 else if (nested_in_vect_loop
)
4530 /* Do not use an adjustment def as that case is not supported
4531 correctly if ncopies is not one. */
4532 vect_is_simple_use (initial_def
, loop_vinfo
, &initial_def_dt
);
4533 vec_initial_def
= vect_get_vec_def_for_operand (initial_def
, stmt
);
4536 vec_initial_def
= get_initial_def_for_reduction (stmt
, initial_def
,
4538 vec_initial_defs
.create (1);
4539 vec_initial_defs
.quick_push (vec_initial_def
);
4542 /* Set phi nodes arguments. */
4543 FOR_EACH_VEC_ELT (reduction_phis
, i
, phi_info
)
4545 tree vec_init_def
= vec_initial_defs
[i
];
4546 tree def
= vect_defs
[i
];
4547 for (j
= 0; j
< ncopies
; j
++)
4551 phi_info
= STMT_VINFO_RELATED_STMT (phi_info
);
4552 if (nested_in_vect_loop
)
4554 = vect_get_vec_def_for_stmt_copy (initial_def_dt
,
4558 /* Set the loop-entry arg of the reduction-phi. */
4560 gphi
*phi
= as_a
<gphi
*> (phi_info
->stmt
);
4561 if (STMT_VINFO_VEC_REDUCTION_TYPE (stmt_info
)
4562 == INTEGER_INDUC_COND_REDUCTION
)
4564 /* Initialise the reduction phi to zero. This prevents initial
4565 values of non-zero interferring with the reduction op. */
4566 gcc_assert (ncopies
== 1);
4567 gcc_assert (i
== 0);
4569 tree vec_init_def_type
= TREE_TYPE (vec_init_def
);
4571 = build_vector_from_val (vec_init_def_type
, induc_val
);
4573 add_phi_arg (phi
, induc_val_vec
, loop_preheader_edge (loop
),
4577 add_phi_arg (phi
, vec_init_def
, loop_preheader_edge (loop
),
4580 /* Set the loop-latch arg for the reduction-phi. */
4582 def
= vect_get_vec_def_for_stmt_copy (vect_unknown_def_type
, def
);
4584 add_phi_arg (phi
, def
, loop_latch_edge (loop
), UNKNOWN_LOCATION
);
4586 if (dump_enabled_p ())
4588 dump_printf_loc (MSG_NOTE
, vect_location
,
4589 "transform reduction: created def-use cycle: ");
4590 dump_gimple_stmt (MSG_NOTE
, TDF_SLIM
, phi
, 0);
4591 dump_gimple_stmt (MSG_NOTE
, TDF_SLIM
, SSA_NAME_DEF_STMT (def
), 0);
4596 /* For cond reductions we want to create a new vector (INDEX_COND_EXPR)
4597 which is updated with the current index of the loop for every match of
4598 the original loop's cond_expr (VEC_STMT). This results in a vector
4599 containing the last time the condition passed for that vector lane.
4600 The first match will be a 1 to allow 0 to be used for non-matching
4601 indexes. If there are no matches at all then the vector will be all
4603 if (STMT_VINFO_VEC_REDUCTION_TYPE (stmt_info
) == COND_REDUCTION
)
4605 tree indx_before_incr
, indx_after_incr
;
4606 poly_uint64 nunits_out
= TYPE_VECTOR_SUBPARTS (vectype
);
4608 gimple
*vec_stmt
= STMT_VINFO_VEC_STMT (stmt_info
)->stmt
;
4609 gcc_assert (gimple_assign_rhs_code (vec_stmt
) == VEC_COND_EXPR
);
4611 int scalar_precision
4612 = GET_MODE_PRECISION (SCALAR_TYPE_MODE (TREE_TYPE (vectype
)));
4613 tree cr_index_scalar_type
= make_unsigned_type (scalar_precision
);
4614 tree cr_index_vector_type
= build_vector_type
4615 (cr_index_scalar_type
, TYPE_VECTOR_SUBPARTS (vectype
));
4617 /* First we create a simple vector induction variable which starts
4618 with the values {1,2,3,...} (SERIES_VECT) and increments by the
4619 vector size (STEP). */
4621 /* Create a {1,2,3,...} vector. */
4622 tree series_vect
= build_index_vector (cr_index_vector_type
, 1, 1);
4624 /* Create a vector of the step value. */
4625 tree step
= build_int_cst (cr_index_scalar_type
, nunits_out
);
4626 tree vec_step
= build_vector_from_val (cr_index_vector_type
, step
);
4628 /* Create an induction variable. */
4629 gimple_stmt_iterator incr_gsi
;
4631 standard_iv_increment_position (loop
, &incr_gsi
, &insert_after
);
4632 create_iv (series_vect
, vec_step
, NULL_TREE
, loop
, &incr_gsi
,
4633 insert_after
, &indx_before_incr
, &indx_after_incr
);
4635 /* Next create a new phi node vector (NEW_PHI_TREE) which starts
4636 filled with zeros (VEC_ZERO). */
4638 /* Create a vector of 0s. */
4639 tree zero
= build_zero_cst (cr_index_scalar_type
);
4640 tree vec_zero
= build_vector_from_val (cr_index_vector_type
, zero
);
4642 /* Create a vector phi node. */
4643 tree new_phi_tree
= make_ssa_name (cr_index_vector_type
);
4644 new_phi
= create_phi_node (new_phi_tree
, loop
->header
);
4645 loop_vinfo
->add_stmt (new_phi
);
4646 add_phi_arg (as_a
<gphi
*> (new_phi
), vec_zero
,
4647 loop_preheader_edge (loop
), UNKNOWN_LOCATION
);
4649 /* Now take the condition from the loops original cond_expr
4650 (VEC_STMT) and produce a new cond_expr (INDEX_COND_EXPR) which for
4651 every match uses values from the induction variable
4652 (INDEX_BEFORE_INCR) otherwise uses values from the phi node
4654 Finally, we update the phi (NEW_PHI_TREE) to take the value of
4655 the new cond_expr (INDEX_COND_EXPR). */
4657 /* Duplicate the condition from vec_stmt. */
4658 tree ccompare
= unshare_expr (gimple_assign_rhs1 (vec_stmt
));
4660 /* Create a conditional, where the condition is taken from vec_stmt
4661 (CCOMPARE), then is the induction index (INDEX_BEFORE_INCR) and
4662 else is the phi (NEW_PHI_TREE). */
4663 tree index_cond_expr
= build3 (VEC_COND_EXPR
, cr_index_vector_type
,
4664 ccompare
, indx_before_incr
,
4666 induction_index
= make_ssa_name (cr_index_vector_type
);
4667 gimple
*index_condition
= gimple_build_assign (induction_index
,
4669 gsi_insert_before (&incr_gsi
, index_condition
, GSI_SAME_STMT
);
4670 stmt_vec_info index_vec_info
= loop_vinfo
->add_stmt (index_condition
);
4671 STMT_VINFO_VECTYPE (index_vec_info
) = cr_index_vector_type
;
4673 /* Update the phi with the vec cond. */
4674 add_phi_arg (as_a
<gphi
*> (new_phi
), induction_index
,
4675 loop_latch_edge (loop
), UNKNOWN_LOCATION
);
4678 /* 2. Create epilog code.
4679 The reduction epilog code operates across the elements of the vector
4680 of partial results computed by the vectorized loop.
4681 The reduction epilog code consists of:
4683 step 1: compute the scalar result in a vector (v_out2)
4684 step 2: extract the scalar result (s_out3) from the vector (v_out2)
4685 step 3: adjust the scalar result (s_out3) if needed.
4687 Step 1 can be accomplished using one the following three schemes:
4688 (scheme 1) using reduc_fn, if available.
4689 (scheme 2) using whole-vector shifts, if available.
4690 (scheme 3) using a scalar loop. In this case steps 1+2 above are
4693 The overall epilog code looks like this:
4695 s_out0 = phi <s_loop> # original EXIT_PHI
4696 v_out1 = phi <VECT_DEF> # NEW_EXIT_PHI
4697 v_out2 = reduce <v_out1> # step 1
4698 s_out3 = extract_field <v_out2, 0> # step 2
4699 s_out4 = adjust_result <s_out3> # step 3
4701 (step 3 is optional, and steps 1 and 2 may be combined).
4702 Lastly, the uses of s_out0 are replaced by s_out4. */
4705 /* 2.1 Create new loop-exit-phis to preserve loop-closed form:
4706 v_out1 = phi <VECT_DEF>
4707 Store them in NEW_PHIS. */
4709 exit_bb
= single_exit (loop
)->dest
;
4710 prev_phi_info
= NULL
;
4711 new_phis
.create (vect_defs
.length ());
4712 FOR_EACH_VEC_ELT (vect_defs
, i
, def
)
4714 for (j
= 0; j
< ncopies
; j
++)
4716 tree new_def
= copy_ssa_name (def
);
4717 phi
= create_phi_node (new_def
, exit_bb
);
4718 stmt_vec_info phi_info
= loop_vinfo
->add_stmt (phi
);
4720 new_phis
.quick_push (phi
);
4723 def
= vect_get_vec_def_for_stmt_copy (dt
, def
);
4724 STMT_VINFO_RELATED_STMT (prev_phi_info
) = phi_info
;
4727 SET_PHI_ARG_DEF (phi
, single_exit (loop
)->dest_idx
, def
);
4728 prev_phi_info
= phi_info
;
4732 /* The epilogue is created for the outer-loop, i.e., for the loop being
4733 vectorized. Create exit phis for the outer loop. */
4737 exit_bb
= single_exit (loop
)->dest
;
4738 inner_phis
.create (vect_defs
.length ());
4739 FOR_EACH_VEC_ELT (new_phis
, i
, phi
)
4741 stmt_vec_info phi_info
= loop_vinfo
->lookup_stmt (phi
);
4742 tree new_result
= copy_ssa_name (PHI_RESULT (phi
));
4743 gphi
*outer_phi
= create_phi_node (new_result
, exit_bb
);
4744 SET_PHI_ARG_DEF (outer_phi
, single_exit (loop
)->dest_idx
,
4746 prev_phi_info
= loop_vinfo
->add_stmt (outer_phi
);
4747 inner_phis
.quick_push (phi_info
);
4748 new_phis
[i
] = outer_phi
;
4749 while (STMT_VINFO_RELATED_STMT (phi_info
))
4751 phi_info
= STMT_VINFO_RELATED_STMT (phi_info
);
4752 new_result
= copy_ssa_name (PHI_RESULT (phi_info
->stmt
));
4753 outer_phi
= create_phi_node (new_result
, exit_bb
);
4754 SET_PHI_ARG_DEF (outer_phi
, single_exit (loop
)->dest_idx
,
4755 PHI_RESULT (phi_info
->stmt
));
4756 stmt_vec_info outer_phi_info
= loop_vinfo
->add_stmt (outer_phi
);
4757 STMT_VINFO_RELATED_STMT (prev_phi_info
) = outer_phi_info
;
4758 prev_phi_info
= outer_phi_info
;
4763 exit_gsi
= gsi_after_labels (exit_bb
);
4765 /* 2.2 Get the relevant tree-code to use in the epilog for schemes 2,3
4766 (i.e. when reduc_fn is not available) and in the final adjustment
4767 code (if needed). Also get the original scalar reduction variable as
4768 defined in the loop. In case STMT is a "pattern-stmt" (i.e. - it
4769 represents a reduction pattern), the tree-code and scalar-def are
4770 taken from the original stmt that the pattern-stmt (STMT) replaces.
4771 Otherwise (it is a regular reduction) - the tree-code and scalar-def
4772 are taken from STMT. */
4774 stmt_vec_info orig_stmt_info
= STMT_VINFO_RELATED_STMT (stmt_info
);
4775 if (!orig_stmt_info
)
4777 /* Regular reduction */
4778 orig_stmt_info
= stmt_info
;
4782 /* Reduction pattern */
4783 gcc_assert (STMT_VINFO_IN_PATTERN_P (orig_stmt_info
));
4784 gcc_assert (STMT_VINFO_RELATED_STMT (orig_stmt_info
) == stmt_info
);
4787 code
= gimple_assign_rhs_code (orig_stmt_info
->stmt
);
4788 /* For MINUS_EXPR the initial vector is [init_val,0,...,0], therefore,
4789 partial results are added and not subtracted. */
4790 if (code
== MINUS_EXPR
)
4793 scalar_dest
= gimple_assign_lhs (orig_stmt_info
->stmt
);
4794 scalar_type
= TREE_TYPE (scalar_dest
);
4795 scalar_results
.create (group_size
);
4796 new_scalar_dest
= vect_create_destination_var (scalar_dest
, NULL
);
4797 bitsize
= TYPE_SIZE (scalar_type
);
4799 /* In case this is a reduction in an inner-loop while vectorizing an outer
4800 loop - we don't need to extract a single scalar result at the end of the
4801 inner-loop (unless it is double reduction, i.e., the use of reduction is
4802 outside the outer-loop). The final vector of partial results will be used
4803 in the vectorized outer-loop, or reduced to a scalar result at the end of
4805 if (nested_in_vect_loop
&& !double_reduc
)
4806 goto vect_finalize_reduction
;
4808 /* SLP reduction without reduction chain, e.g.,
4812 b2 = operation (b1) */
4813 slp_reduc
= (slp_node
&& !REDUC_GROUP_FIRST_ELEMENT (vinfo_for_stmt (stmt
)));
4815 /* True if we should implement SLP_REDUC using native reduction operations
4816 instead of scalar operations. */
4817 direct_slp_reduc
= (reduc_fn
!= IFN_LAST
4819 && !TYPE_VECTOR_SUBPARTS (vectype
).is_constant ());
4821 /* In case of reduction chain, e.g.,
4824 a3 = operation (a2),
4826 we may end up with more than one vector result. Here we reduce them to
4828 if (REDUC_GROUP_FIRST_ELEMENT (vinfo_for_stmt (stmt
)) || direct_slp_reduc
)
4830 tree first_vect
= PHI_RESULT (new_phis
[0]);
4831 gassign
*new_vec_stmt
= NULL
;
4832 vec_dest
= vect_create_destination_var (scalar_dest
, vectype
);
4833 for (k
= 1; k
< new_phis
.length (); k
++)
4835 gimple
*next_phi
= new_phis
[k
];
4836 tree second_vect
= PHI_RESULT (next_phi
);
4837 tree tem
= make_ssa_name (vec_dest
, new_vec_stmt
);
4838 new_vec_stmt
= gimple_build_assign (tem
, code
,
4839 first_vect
, second_vect
);
4840 gsi_insert_before (&exit_gsi
, new_vec_stmt
, GSI_SAME_STMT
);
4844 new_phi_result
= first_vect
;
4847 new_phis
.truncate (0);
4848 new_phis
.safe_push (new_vec_stmt
);
4851 /* Likewise if we couldn't use a single defuse cycle. */
4852 else if (ncopies
> 1)
4854 gcc_assert (new_phis
.length () == 1);
4855 tree first_vect
= PHI_RESULT (new_phis
[0]);
4856 gassign
*new_vec_stmt
= NULL
;
4857 vec_dest
= vect_create_destination_var (scalar_dest
, vectype
);
4858 gimple
*next_phi
= new_phis
[0];
4859 for (int k
= 1; k
< ncopies
; ++k
)
4861 next_phi
= STMT_VINFO_RELATED_STMT (vinfo_for_stmt (next_phi
));
4862 tree second_vect
= PHI_RESULT (next_phi
);
4863 tree tem
= make_ssa_name (vec_dest
, new_vec_stmt
);
4864 new_vec_stmt
= gimple_build_assign (tem
, code
,
4865 first_vect
, second_vect
);
4866 gsi_insert_before (&exit_gsi
, new_vec_stmt
, GSI_SAME_STMT
);
4869 new_phi_result
= first_vect
;
4870 new_phis
.truncate (0);
4871 new_phis
.safe_push (new_vec_stmt
);
4874 new_phi_result
= PHI_RESULT (new_phis
[0]);
4876 if (STMT_VINFO_VEC_REDUCTION_TYPE (stmt_info
) == COND_REDUCTION
4877 && reduc_fn
!= IFN_LAST
)
4879 /* For condition reductions, we have a vector (NEW_PHI_RESULT) containing
4880 various data values where the condition matched and another vector
4881 (INDUCTION_INDEX) containing all the indexes of those matches. We
4882 need to extract the last matching index (which will be the index with
4883 highest value) and use this to index into the data vector.
4884 For the case where there were no matches, the data vector will contain
4885 all default values and the index vector will be all zeros. */
4887 /* Get various versions of the type of the vector of indexes. */
4888 tree index_vec_type
= TREE_TYPE (induction_index
);
4889 gcc_checking_assert (TYPE_UNSIGNED (index_vec_type
));
4890 tree index_scalar_type
= TREE_TYPE (index_vec_type
);
4891 tree index_vec_cmp_type
= build_same_sized_truth_vector_type
4894 /* Get an unsigned integer version of the type of the data vector. */
4895 int scalar_precision
4896 = GET_MODE_PRECISION (SCALAR_TYPE_MODE (scalar_type
));
4897 tree scalar_type_unsigned
= make_unsigned_type (scalar_precision
);
4898 tree vectype_unsigned
= build_vector_type
4899 (scalar_type_unsigned
, TYPE_VECTOR_SUBPARTS (vectype
));
4901 /* First we need to create a vector (ZERO_VEC) of zeros and another
4902 vector (MAX_INDEX_VEC) filled with the last matching index, which we
4903 can create using a MAX reduction and then expanding.
4904 In the case where the loop never made any matches, the max index will
4907 /* Vector of {0, 0, 0,...}. */
4908 tree zero_vec
= make_ssa_name (vectype
);
4909 tree zero_vec_rhs
= build_zero_cst (vectype
);
4910 gimple
*zero_vec_stmt
= gimple_build_assign (zero_vec
, zero_vec_rhs
);
4911 gsi_insert_before (&exit_gsi
, zero_vec_stmt
, GSI_SAME_STMT
);
4913 /* Find maximum value from the vector of found indexes. */
4914 tree max_index
= make_ssa_name (index_scalar_type
);
4915 gcall
*max_index_stmt
= gimple_build_call_internal (IFN_REDUC_MAX
,
4916 1, induction_index
);
4917 gimple_call_set_lhs (max_index_stmt
, max_index
);
4918 gsi_insert_before (&exit_gsi
, max_index_stmt
, GSI_SAME_STMT
);
4920 /* Vector of {max_index, max_index, max_index,...}. */
4921 tree max_index_vec
= make_ssa_name (index_vec_type
);
4922 tree max_index_vec_rhs
= build_vector_from_val (index_vec_type
,
4924 gimple
*max_index_vec_stmt
= gimple_build_assign (max_index_vec
,
4926 gsi_insert_before (&exit_gsi
, max_index_vec_stmt
, GSI_SAME_STMT
);
4928 /* Next we compare the new vector (MAX_INDEX_VEC) full of max indexes
4929 with the vector (INDUCTION_INDEX) of found indexes, choosing values
4930 from the data vector (NEW_PHI_RESULT) for matches, 0 (ZERO_VEC)
4931 otherwise. Only one value should match, resulting in a vector
4932 (VEC_COND) with one data value and the rest zeros.
4933 In the case where the loop never made any matches, every index will
4934 match, resulting in a vector with all data values (which will all be
4935 the default value). */
4937 /* Compare the max index vector to the vector of found indexes to find
4938 the position of the max value. */
4939 tree vec_compare
= make_ssa_name (index_vec_cmp_type
);
4940 gimple
*vec_compare_stmt
= gimple_build_assign (vec_compare
, EQ_EXPR
,
4943 gsi_insert_before (&exit_gsi
, vec_compare_stmt
, GSI_SAME_STMT
);
4945 /* Use the compare to choose either values from the data vector or
4947 tree vec_cond
= make_ssa_name (vectype
);
4948 gimple
*vec_cond_stmt
= gimple_build_assign (vec_cond
, VEC_COND_EXPR
,
4949 vec_compare
, new_phi_result
,
4951 gsi_insert_before (&exit_gsi
, vec_cond_stmt
, GSI_SAME_STMT
);
4953 /* Finally we need to extract the data value from the vector (VEC_COND)
4954 into a scalar (MATCHED_DATA_REDUC). Logically we want to do a OR
4955 reduction, but because this doesn't exist, we can use a MAX reduction
4956 instead. The data value might be signed or a float so we need to cast
4958 In the case where the loop never made any matches, the data values are
4959 all identical, and so will reduce down correctly. */
4961 /* Make the matched data values unsigned. */
4962 tree vec_cond_cast
= make_ssa_name (vectype_unsigned
);
4963 tree vec_cond_cast_rhs
= build1 (VIEW_CONVERT_EXPR
, vectype_unsigned
,
4965 gimple
*vec_cond_cast_stmt
= gimple_build_assign (vec_cond_cast
,
4968 gsi_insert_before (&exit_gsi
, vec_cond_cast_stmt
, GSI_SAME_STMT
);
4970 /* Reduce down to a scalar value. */
4971 tree data_reduc
= make_ssa_name (scalar_type_unsigned
);
4972 gcall
*data_reduc_stmt
= gimple_build_call_internal (IFN_REDUC_MAX
,
4974 gimple_call_set_lhs (data_reduc_stmt
, data_reduc
);
4975 gsi_insert_before (&exit_gsi
, data_reduc_stmt
, GSI_SAME_STMT
);
4977 /* Convert the reduced value back to the result type and set as the
4979 gimple_seq stmts
= NULL
;
4980 new_temp
= gimple_build (&stmts
, VIEW_CONVERT_EXPR
, scalar_type
,
4982 gsi_insert_seq_before (&exit_gsi
, stmts
, GSI_SAME_STMT
);
4983 scalar_results
.safe_push (new_temp
);
4985 else if (STMT_VINFO_VEC_REDUCTION_TYPE (stmt_info
) == COND_REDUCTION
4986 && reduc_fn
== IFN_LAST
)
4988 /* Condition reduction without supported IFN_REDUC_MAX. Generate
4990 idx_val = induction_index[0];
4991 val = data_reduc[0];
4992 for (idx = 0, val = init, i = 0; i < nelts; ++i)
4993 if (induction_index[i] > idx_val)
4994 val = data_reduc[i], idx_val = induction_index[i];
4997 tree data_eltype
= TREE_TYPE (TREE_TYPE (new_phi_result
));
4998 tree idx_eltype
= TREE_TYPE (TREE_TYPE (induction_index
));
4999 unsigned HOST_WIDE_INT el_size
= tree_to_uhwi (TYPE_SIZE (idx_eltype
));
5000 poly_uint64 nunits
= TYPE_VECTOR_SUBPARTS (TREE_TYPE (induction_index
));
5001 /* Enforced by vectorizable_reduction, which ensures we have target
5002 support before allowing a conditional reduction on variable-length
5004 unsigned HOST_WIDE_INT v_size
= el_size
* nunits
.to_constant ();
5005 tree idx_val
= NULL_TREE
, val
= NULL_TREE
;
5006 for (unsigned HOST_WIDE_INT off
= 0; off
< v_size
; off
+= el_size
)
5008 tree old_idx_val
= idx_val
;
5010 idx_val
= make_ssa_name (idx_eltype
);
5011 epilog_stmt
= gimple_build_assign (idx_val
, BIT_FIELD_REF
,
5012 build3 (BIT_FIELD_REF
, idx_eltype
,
5014 bitsize_int (el_size
),
5015 bitsize_int (off
)));
5016 gsi_insert_before (&exit_gsi
, epilog_stmt
, GSI_SAME_STMT
);
5017 val
= make_ssa_name (data_eltype
);
5018 epilog_stmt
= gimple_build_assign (val
, BIT_FIELD_REF
,
5019 build3 (BIT_FIELD_REF
,
5022 bitsize_int (el_size
),
5023 bitsize_int (off
)));
5024 gsi_insert_before (&exit_gsi
, epilog_stmt
, GSI_SAME_STMT
);
5027 tree new_idx_val
= idx_val
;
5029 if (off
!= v_size
- el_size
)
5031 new_idx_val
= make_ssa_name (idx_eltype
);
5032 epilog_stmt
= gimple_build_assign (new_idx_val
,
5035 gsi_insert_before (&exit_gsi
, epilog_stmt
, GSI_SAME_STMT
);
5037 new_val
= make_ssa_name (data_eltype
);
5038 epilog_stmt
= gimple_build_assign (new_val
,
5045 gsi_insert_before (&exit_gsi
, epilog_stmt
, GSI_SAME_STMT
);
5046 idx_val
= new_idx_val
;
5050 /* Convert the reduced value back to the result type and set as the
5052 gimple_seq stmts
= NULL
;
5053 val
= gimple_convert (&stmts
, scalar_type
, val
);
5054 gsi_insert_seq_before (&exit_gsi
, stmts
, GSI_SAME_STMT
);
5055 scalar_results
.safe_push (val
);
5058 /* 2.3 Create the reduction code, using one of the three schemes described
5059 above. In SLP we simply need to extract all the elements from the
5060 vector (without reducing them), so we use scalar shifts. */
5061 else if (reduc_fn
!= IFN_LAST
&& !slp_reduc
)
5067 v_out2 = reduc_expr <v_out1> */
5069 if (dump_enabled_p ())
5070 dump_printf_loc (MSG_NOTE
, vect_location
,
5071 "Reduce using direct vector reduction.\n");
5073 vec_elem_type
= TREE_TYPE (TREE_TYPE (new_phi_result
));
5074 if (!useless_type_conversion_p (scalar_type
, vec_elem_type
))
5077 = vect_create_destination_var (scalar_dest
, vec_elem_type
);
5078 epilog_stmt
= gimple_build_call_internal (reduc_fn
, 1,
5080 gimple_set_lhs (epilog_stmt
, tmp_dest
);
5081 new_temp
= make_ssa_name (tmp_dest
, epilog_stmt
);
5082 gimple_set_lhs (epilog_stmt
, new_temp
);
5083 gsi_insert_before (&exit_gsi
, epilog_stmt
, GSI_SAME_STMT
);
5085 epilog_stmt
= gimple_build_assign (new_scalar_dest
, NOP_EXPR
,
5090 epilog_stmt
= gimple_build_call_internal (reduc_fn
, 1,
5092 gimple_set_lhs (epilog_stmt
, new_scalar_dest
);
5095 new_temp
= make_ssa_name (new_scalar_dest
, epilog_stmt
);
5096 gimple_set_lhs (epilog_stmt
, new_temp
);
5097 gsi_insert_before (&exit_gsi
, epilog_stmt
, GSI_SAME_STMT
);
5099 if ((STMT_VINFO_VEC_REDUCTION_TYPE (stmt_info
)
5100 == INTEGER_INDUC_COND_REDUCTION
)
5101 && !operand_equal_p (initial_def
, induc_val
, 0))
5103 /* Earlier we set the initial value to be a vector if induc_val
5104 values. Check the result and if it is induc_val then replace
5105 with the original initial value, unless induc_val is
5106 the same as initial_def already. */
5107 tree zcompare
= build2 (EQ_EXPR
, boolean_type_node
, new_temp
,
5110 tmp
= make_ssa_name (new_scalar_dest
);
5111 epilog_stmt
= gimple_build_assign (tmp
, COND_EXPR
, zcompare
,
5112 initial_def
, new_temp
);
5113 gsi_insert_before (&exit_gsi
, epilog_stmt
, GSI_SAME_STMT
);
5117 scalar_results
.safe_push (new_temp
);
5119 else if (direct_slp_reduc
)
5121 /* Here we create one vector for each of the REDUC_GROUP_SIZE results,
5122 with the elements for other SLP statements replaced with the
5123 neutral value. We can then do a normal reduction on each vector. */
5125 /* Enforced by vectorizable_reduction. */
5126 gcc_assert (new_phis
.length () == 1);
5127 gcc_assert (pow2p_hwi (group_size
));
5129 slp_tree orig_phis_slp_node
= slp_node_instance
->reduc_phis
;
5130 vec
<stmt_vec_info
> orig_phis
5131 = SLP_TREE_SCALAR_STMTS (orig_phis_slp_node
);
5132 gimple_seq seq
= NULL
;
5134 /* Build a vector {0, 1, 2, ...}, with the same number of elements
5135 and the same element size as VECTYPE. */
5136 tree index
= build_index_vector (vectype
, 0, 1);
5137 tree index_type
= TREE_TYPE (index
);
5138 tree index_elt_type
= TREE_TYPE (index_type
);
5139 tree mask_type
= build_same_sized_truth_vector_type (index_type
);
5141 /* Create a vector that, for each element, identifies which of
5142 the REDUC_GROUP_SIZE results should use it. */
5143 tree index_mask
= build_int_cst (index_elt_type
, group_size
- 1);
5144 index
= gimple_build (&seq
, BIT_AND_EXPR
, index_type
, index
,
5145 build_vector_from_val (index_type
, index_mask
));
5147 /* Get a neutral vector value. This is simply a splat of the neutral
5148 scalar value if we have one, otherwise the initial scalar value
5149 is itself a neutral value. */
5150 tree vector_identity
= NULL_TREE
;
5152 vector_identity
= gimple_build_vector_from_val (&seq
, vectype
,
5154 for (unsigned int i
= 0; i
< group_size
; ++i
)
5156 /* If there's no univeral neutral value, we can use the
5157 initial scalar value from the original PHI. This is used
5158 for MIN and MAX reduction, for example. */
5162 = PHI_ARG_DEF_FROM_EDGE (orig_phis
[i
]->stmt
,
5163 loop_preheader_edge (loop
));
5164 vector_identity
= gimple_build_vector_from_val (&seq
, vectype
,
5168 /* Calculate the equivalent of:
5170 sel[j] = (index[j] == i);
5172 which selects the elements of NEW_PHI_RESULT that should
5173 be included in the result. */
5174 tree compare_val
= build_int_cst (index_elt_type
, i
);
5175 compare_val
= build_vector_from_val (index_type
, compare_val
);
5176 tree sel
= gimple_build (&seq
, EQ_EXPR
, mask_type
,
5177 index
, compare_val
);
5179 /* Calculate the equivalent of:
5181 vec = seq ? new_phi_result : vector_identity;
5183 VEC is now suitable for a full vector reduction. */
5184 tree vec
= gimple_build (&seq
, VEC_COND_EXPR
, vectype
,
5185 sel
, new_phi_result
, vector_identity
);
5187 /* Do the reduction and convert it to the appropriate type. */
5188 tree scalar
= gimple_build (&seq
, as_combined_fn (reduc_fn
),
5189 TREE_TYPE (vectype
), vec
);
5190 scalar
= gimple_convert (&seq
, scalar_type
, scalar
);
5191 scalar_results
.safe_push (scalar
);
5193 gsi_insert_seq_before (&exit_gsi
, seq
, GSI_SAME_STMT
);
5197 bool reduce_with_shift
;
5200 /* COND reductions all do the final reduction with MAX_EXPR
5202 if (code
== COND_EXPR
)
5204 if (STMT_VINFO_VEC_REDUCTION_TYPE (stmt_info
)
5205 == INTEGER_INDUC_COND_REDUCTION
)
5211 /* See if the target wants to do the final (shift) reduction
5212 in a vector mode of smaller size and first reduce upper/lower
5213 halves against each other. */
5214 enum machine_mode mode1
= mode
;
5215 tree vectype1
= vectype
;
5216 unsigned sz
= tree_to_uhwi (TYPE_SIZE_UNIT (vectype
));
5219 && (mode1
= targetm
.vectorize
.split_reduction (mode
)) != mode
)
5220 sz1
= GET_MODE_SIZE (mode1
).to_constant ();
5222 vectype1
= get_vectype_for_scalar_type_and_size (scalar_type
, sz1
);
5223 reduce_with_shift
= have_whole_vector_shift (mode1
);
5224 if (!VECTOR_MODE_P (mode1
))
5225 reduce_with_shift
= false;
5228 optab optab
= optab_for_tree_code (code
, vectype1
, optab_default
);
5229 if (optab_handler (optab
, mode1
) == CODE_FOR_nothing
)
5230 reduce_with_shift
= false;
5233 /* First reduce the vector to the desired vector size we should
5234 do shift reduction on by combining upper and lower halves. */
5235 new_temp
= new_phi_result
;
5238 gcc_assert (!slp_reduc
);
5240 vectype1
= get_vectype_for_scalar_type_and_size (scalar_type
, sz
);
5242 /* The target has to make sure we support lowpart/highpart
5243 extraction, either via direct vector extract or through
5244 an integer mode punning. */
5246 if (convert_optab_handler (vec_extract_optab
,
5247 TYPE_MODE (TREE_TYPE (new_temp
)),
5248 TYPE_MODE (vectype1
))
5249 != CODE_FOR_nothing
)
5251 /* Extract sub-vectors directly once vec_extract becomes
5252 a conversion optab. */
5253 dst1
= make_ssa_name (vectype1
);
5255 = gimple_build_assign (dst1
, BIT_FIELD_REF
,
5256 build3 (BIT_FIELD_REF
, vectype1
,
5257 new_temp
, TYPE_SIZE (vectype1
),
5259 gsi_insert_before (&exit_gsi
, epilog_stmt
, GSI_SAME_STMT
);
5260 dst2
= make_ssa_name (vectype1
);
5262 = gimple_build_assign (dst2
, BIT_FIELD_REF
,
5263 build3 (BIT_FIELD_REF
, vectype1
,
5264 new_temp
, TYPE_SIZE (vectype1
),
5265 bitsize_int (sz
* BITS_PER_UNIT
)));
5266 gsi_insert_before (&exit_gsi
, epilog_stmt
, GSI_SAME_STMT
);
5270 /* Extract via punning to appropriately sized integer mode
5272 tree eltype
= build_nonstandard_integer_type (sz
* BITS_PER_UNIT
,
5274 tree etype
= build_vector_type (eltype
, 2);
5275 gcc_assert (convert_optab_handler (vec_extract_optab
,
5278 != CODE_FOR_nothing
);
5279 tree tem
= make_ssa_name (etype
);
5280 epilog_stmt
= gimple_build_assign (tem
, VIEW_CONVERT_EXPR
,
5281 build1 (VIEW_CONVERT_EXPR
,
5283 gsi_insert_before (&exit_gsi
, epilog_stmt
, GSI_SAME_STMT
);
5285 tem
= make_ssa_name (eltype
);
5287 = gimple_build_assign (tem
, BIT_FIELD_REF
,
5288 build3 (BIT_FIELD_REF
, eltype
,
5289 new_temp
, TYPE_SIZE (eltype
),
5291 gsi_insert_before (&exit_gsi
, epilog_stmt
, GSI_SAME_STMT
);
5292 dst1
= make_ssa_name (vectype1
);
5293 epilog_stmt
= gimple_build_assign (dst1
, VIEW_CONVERT_EXPR
,
5294 build1 (VIEW_CONVERT_EXPR
,
5296 gsi_insert_before (&exit_gsi
, epilog_stmt
, GSI_SAME_STMT
);
5297 tem
= make_ssa_name (eltype
);
5299 = gimple_build_assign (tem
, BIT_FIELD_REF
,
5300 build3 (BIT_FIELD_REF
, eltype
,
5301 new_temp
, TYPE_SIZE (eltype
),
5302 bitsize_int (sz
* BITS_PER_UNIT
)));
5303 gsi_insert_before (&exit_gsi
, epilog_stmt
, GSI_SAME_STMT
);
5304 dst2
= make_ssa_name (vectype1
);
5305 epilog_stmt
= gimple_build_assign (dst2
, VIEW_CONVERT_EXPR
,
5306 build1 (VIEW_CONVERT_EXPR
,
5308 gsi_insert_before (&exit_gsi
, epilog_stmt
, GSI_SAME_STMT
);
5311 new_temp
= make_ssa_name (vectype1
);
5312 epilog_stmt
= gimple_build_assign (new_temp
, code
, dst1
, dst2
);
5313 gsi_insert_before (&exit_gsi
, epilog_stmt
, GSI_SAME_STMT
);
5316 if (reduce_with_shift
&& !slp_reduc
)
5318 int element_bitsize
= tree_to_uhwi (bitsize
);
5319 /* Enforced by vectorizable_reduction, which disallows SLP reductions
5320 for variable-length vectors and also requires direct target support
5321 for loop reductions. */
5322 int vec_size_in_bits
= tree_to_uhwi (TYPE_SIZE (vectype1
));
5323 int nelements
= vec_size_in_bits
/ element_bitsize
;
5324 vec_perm_builder sel
;
5325 vec_perm_indices indices
;
5329 tree zero_vec
= build_zero_cst (vectype1
);
5331 for (offset = nelements/2; offset >= 1; offset/=2)
5333 Create: va' = vec_shift <va, offset>
5334 Create: va = vop <va, va'>
5339 if (dump_enabled_p ())
5340 dump_printf_loc (MSG_NOTE
, vect_location
,
5341 "Reduce using vector shifts\n");
5343 mode1
= TYPE_MODE (vectype1
);
5344 vec_dest
= vect_create_destination_var (scalar_dest
, vectype1
);
5345 for (elt_offset
= nelements
/ 2;
5349 calc_vec_perm_mask_for_shift (elt_offset
, nelements
, &sel
);
5350 indices
.new_vector (sel
, 2, nelements
);
5351 tree mask
= vect_gen_perm_mask_any (vectype1
, indices
);
5352 epilog_stmt
= gimple_build_assign (vec_dest
, VEC_PERM_EXPR
,
5353 new_temp
, zero_vec
, mask
);
5354 new_name
= make_ssa_name (vec_dest
, epilog_stmt
);
5355 gimple_assign_set_lhs (epilog_stmt
, new_name
);
5356 gsi_insert_before (&exit_gsi
, epilog_stmt
, GSI_SAME_STMT
);
5358 epilog_stmt
= gimple_build_assign (vec_dest
, code
, new_name
,
5360 new_temp
= make_ssa_name (vec_dest
, epilog_stmt
);
5361 gimple_assign_set_lhs (epilog_stmt
, new_temp
);
5362 gsi_insert_before (&exit_gsi
, epilog_stmt
, GSI_SAME_STMT
);
5365 /* 2.4 Extract the final scalar result. Create:
5366 s_out3 = extract_field <v_out2, bitpos> */
5368 if (dump_enabled_p ())
5369 dump_printf_loc (MSG_NOTE
, vect_location
,
5370 "extract scalar result\n");
5372 rhs
= build3 (BIT_FIELD_REF
, scalar_type
, new_temp
,
5373 bitsize
, bitsize_zero_node
);
5374 epilog_stmt
= gimple_build_assign (new_scalar_dest
, rhs
);
5375 new_temp
= make_ssa_name (new_scalar_dest
, epilog_stmt
);
5376 gimple_assign_set_lhs (epilog_stmt
, new_temp
);
5377 gsi_insert_before (&exit_gsi
, epilog_stmt
, GSI_SAME_STMT
);
5378 scalar_results
.safe_push (new_temp
);
5383 s = extract_field <v_out2, 0>
5384 for (offset = element_size;
5385 offset < vector_size;
5386 offset += element_size;)
5388 Create: s' = extract_field <v_out2, offset>
5389 Create: s = op <s, s'> // For non SLP cases
5392 if (dump_enabled_p ())
5393 dump_printf_loc (MSG_NOTE
, vect_location
,
5394 "Reduce using scalar code.\n");
5396 int vec_size_in_bits
= tree_to_uhwi (TYPE_SIZE (vectype1
));
5397 int element_bitsize
= tree_to_uhwi (bitsize
);
5398 FOR_EACH_VEC_ELT (new_phis
, i
, new_phi
)
5401 if (gimple_code (new_phi
) == GIMPLE_PHI
)
5402 vec_temp
= PHI_RESULT (new_phi
);
5404 vec_temp
= gimple_assign_lhs (new_phi
);
5405 tree rhs
= build3 (BIT_FIELD_REF
, scalar_type
, vec_temp
, bitsize
,
5407 epilog_stmt
= gimple_build_assign (new_scalar_dest
, rhs
);
5408 new_temp
= make_ssa_name (new_scalar_dest
, epilog_stmt
);
5409 gimple_assign_set_lhs (epilog_stmt
, new_temp
);
5410 gsi_insert_before (&exit_gsi
, epilog_stmt
, GSI_SAME_STMT
);
5412 /* In SLP we don't need to apply reduction operation, so we just
5413 collect s' values in SCALAR_RESULTS. */
5415 scalar_results
.safe_push (new_temp
);
5417 for (bit_offset
= element_bitsize
;
5418 bit_offset
< vec_size_in_bits
;
5419 bit_offset
+= element_bitsize
)
5421 tree bitpos
= bitsize_int (bit_offset
);
5422 tree rhs
= build3 (BIT_FIELD_REF
, scalar_type
, vec_temp
,
5425 epilog_stmt
= gimple_build_assign (new_scalar_dest
, rhs
);
5426 new_name
= make_ssa_name (new_scalar_dest
, epilog_stmt
);
5427 gimple_assign_set_lhs (epilog_stmt
, new_name
);
5428 gsi_insert_before (&exit_gsi
, epilog_stmt
, GSI_SAME_STMT
);
5432 /* In SLP we don't need to apply reduction operation, so
5433 we just collect s' values in SCALAR_RESULTS. */
5434 new_temp
= new_name
;
5435 scalar_results
.safe_push (new_name
);
5439 epilog_stmt
= gimple_build_assign (new_scalar_dest
, code
,
5440 new_name
, new_temp
);
5441 new_temp
= make_ssa_name (new_scalar_dest
, epilog_stmt
);
5442 gimple_assign_set_lhs (epilog_stmt
, new_temp
);
5443 gsi_insert_before (&exit_gsi
, epilog_stmt
, GSI_SAME_STMT
);
5448 /* The only case where we need to reduce scalar results in SLP, is
5449 unrolling. If the size of SCALAR_RESULTS is greater than
5450 REDUC_GROUP_SIZE, we reduce them combining elements modulo
5451 REDUC_GROUP_SIZE. */
5454 tree res
, first_res
, new_res
;
5457 /* Reduce multiple scalar results in case of SLP unrolling. */
5458 for (j
= group_size
; scalar_results
.iterate (j
, &res
);
5461 first_res
= scalar_results
[j
% group_size
];
5462 new_stmt
= gimple_build_assign (new_scalar_dest
, code
,
5464 new_res
= make_ssa_name (new_scalar_dest
, new_stmt
);
5465 gimple_assign_set_lhs (new_stmt
, new_res
);
5466 gsi_insert_before (&exit_gsi
, new_stmt
, GSI_SAME_STMT
);
5467 scalar_results
[j
% group_size
] = new_res
;
5471 /* Not SLP - we have one scalar to keep in SCALAR_RESULTS. */
5472 scalar_results
.safe_push (new_temp
);
5475 if ((STMT_VINFO_VEC_REDUCTION_TYPE (stmt_info
)
5476 == INTEGER_INDUC_COND_REDUCTION
)
5477 && !operand_equal_p (initial_def
, induc_val
, 0))
5479 /* Earlier we set the initial value to be a vector if induc_val
5480 values. Check the result and if it is induc_val then replace
5481 with the original initial value, unless induc_val is
5482 the same as initial_def already. */
5483 tree zcompare
= build2 (EQ_EXPR
, boolean_type_node
, new_temp
,
5486 tree tmp
= make_ssa_name (new_scalar_dest
);
5487 epilog_stmt
= gimple_build_assign (tmp
, COND_EXPR
, zcompare
,
5488 initial_def
, new_temp
);
5489 gsi_insert_before (&exit_gsi
, epilog_stmt
, GSI_SAME_STMT
);
5490 scalar_results
[0] = tmp
;
5494 vect_finalize_reduction
:
5499 /* 2.5 Adjust the final result by the initial value of the reduction
5500 variable. (When such adjustment is not needed, then
5501 'adjustment_def' is zero). For example, if code is PLUS we create:
5502 new_temp = loop_exit_def + adjustment_def */
5506 gcc_assert (!slp_reduc
);
5507 if (nested_in_vect_loop
)
5509 new_phi
= new_phis
[0];
5510 gcc_assert (TREE_CODE (TREE_TYPE (adjustment_def
)) == VECTOR_TYPE
);
5511 expr
= build2 (code
, vectype
, PHI_RESULT (new_phi
), adjustment_def
);
5512 new_dest
= vect_create_destination_var (scalar_dest
, vectype
);
5516 new_temp
= scalar_results
[0];
5517 gcc_assert (TREE_CODE (TREE_TYPE (adjustment_def
)) != VECTOR_TYPE
);
5518 expr
= build2 (code
, scalar_type
, new_temp
, adjustment_def
);
5519 new_dest
= vect_create_destination_var (scalar_dest
, scalar_type
);
5522 epilog_stmt
= gimple_build_assign (new_dest
, expr
);
5523 new_temp
= make_ssa_name (new_dest
, epilog_stmt
);
5524 gimple_assign_set_lhs (epilog_stmt
, new_temp
);
5525 gsi_insert_before (&exit_gsi
, epilog_stmt
, GSI_SAME_STMT
);
5526 if (nested_in_vect_loop
)
5528 stmt_vec_info epilog_stmt_info
= loop_vinfo
->add_stmt (epilog_stmt
);
5529 STMT_VINFO_RELATED_STMT (epilog_stmt_info
)
5530 = STMT_VINFO_RELATED_STMT (loop_vinfo
->lookup_stmt (new_phi
));
5533 scalar_results
.quick_push (new_temp
);
5535 scalar_results
[0] = new_temp
;
5538 scalar_results
[0] = new_temp
;
5540 new_phis
[0] = epilog_stmt
;
5543 /* 2.6 Handle the loop-exit phis. Replace the uses of scalar loop-exit
5544 phis with new adjusted scalar results, i.e., replace use <s_out0>
5549 s_out0 = phi <s_loop> # (scalar) EXIT_PHI
5550 v_out1 = phi <VECT_DEF> # NEW_EXIT_PHI
5551 v_out2 = reduce <v_out1>
5552 s_out3 = extract_field <v_out2, 0>
5553 s_out4 = adjust_result <s_out3>
5560 s_out0 = phi <s_loop> # (scalar) EXIT_PHI
5561 v_out1 = phi <VECT_DEF> # NEW_EXIT_PHI
5562 v_out2 = reduce <v_out1>
5563 s_out3 = extract_field <v_out2, 0>
5564 s_out4 = adjust_result <s_out3>
5569 /* In SLP reduction chain we reduce vector results into one vector if
5570 necessary, hence we set here REDUC_GROUP_SIZE to 1. SCALAR_DEST is the
5571 LHS of the last stmt in the reduction chain, since we are looking for
5572 the loop exit phi node. */
5573 if (REDUC_GROUP_FIRST_ELEMENT (vinfo_for_stmt (stmt
)))
5575 stmt_vec_info dest_stmt_info
5576 = SLP_TREE_SCALAR_STMTS (slp_node
)[group_size
- 1];
5577 /* Handle reduction patterns. */
5578 if (STMT_VINFO_RELATED_STMT (dest_stmt_info
))
5579 dest_stmt_info
= STMT_VINFO_RELATED_STMT (dest_stmt_info
);
5581 scalar_dest
= gimple_assign_lhs (dest_stmt_info
->stmt
);
5585 /* In SLP we may have several statements in NEW_PHIS and REDUCTION_PHIS (in
5586 case that REDUC_GROUP_SIZE is greater than vectorization factor).
5587 Therefore, we need to match SCALAR_RESULTS with corresponding statements.
5588 The first (REDUC_GROUP_SIZE / number of new vector stmts) scalar results
5589 correspond to the first vector stmt, etc.
5590 (RATIO is equal to (REDUC_GROUP_SIZE / number of new vector stmts)). */
5591 if (group_size
> new_phis
.length ())
5593 ratio
= group_size
/ new_phis
.length ();
5594 gcc_assert (!(group_size
% new_phis
.length ()));
5599 for (k
= 0; k
< group_size
; k
++)
5603 epilog_stmt
= new_phis
[k
/ ratio
];
5604 reduction_phi_info
= reduction_phis
[k
/ ratio
];
5606 inner_phi
= inner_phis
[k
/ ratio
];
5611 stmt_vec_info scalar_stmt_info
= SLP_TREE_SCALAR_STMTS (slp_node
)[k
];
5613 orig_stmt_info
= STMT_VINFO_RELATED_STMT (scalar_stmt_info
);
5614 /* SLP statements can't participate in patterns. */
5615 gcc_assert (!orig_stmt_info
);
5616 scalar_dest
= gimple_assign_lhs (scalar_stmt_info
->stmt
);
5620 /* Find the loop-closed-use at the loop exit of the original scalar
5621 result. (The reduction result is expected to have two immediate uses -
5622 one at the latch block, and one at the loop exit). */
5623 FOR_EACH_IMM_USE_FAST (use_p
, imm_iter
, scalar_dest
)
5624 if (!flow_bb_inside_loop_p (loop
, gimple_bb (USE_STMT (use_p
)))
5625 && !is_gimple_debug (USE_STMT (use_p
)))
5626 phis
.safe_push (USE_STMT (use_p
));
5628 /* While we expect to have found an exit_phi because of loop-closed-ssa
5629 form we can end up without one if the scalar cycle is dead. */
5631 FOR_EACH_VEC_ELT (phis
, i
, exit_phi
)
5635 stmt_vec_info exit_phi_vinfo
5636 = loop_vinfo
->lookup_stmt (exit_phi
);
5639 /* FORNOW. Currently not supporting the case that an inner-loop
5640 reduction is not used in the outer-loop (but only outside the
5641 outer-loop), unless it is double reduction. */
5642 gcc_assert ((STMT_VINFO_RELEVANT_P (exit_phi_vinfo
)
5643 && !STMT_VINFO_LIVE_P (exit_phi_vinfo
))
5647 STMT_VINFO_VEC_STMT (exit_phi_vinfo
) = inner_phi
;
5649 STMT_VINFO_VEC_STMT (exit_phi_vinfo
)
5650 = vinfo_for_stmt (epilog_stmt
);
5652 || STMT_VINFO_DEF_TYPE (exit_phi_vinfo
)
5653 != vect_double_reduction_def
)
5656 /* Handle double reduction:
5658 stmt1: s1 = phi <s0, s2> - double reduction phi (outer loop)
5659 stmt2: s3 = phi <s1, s4> - (regular) reduc phi (inner loop)
5660 stmt3: s4 = use (s3) - (regular) reduc stmt (inner loop)
5661 stmt4: s2 = phi <s4> - double reduction stmt (outer loop)
5663 At that point the regular reduction (stmt2 and stmt3) is
5664 already vectorized, as well as the exit phi node, stmt4.
5665 Here we vectorize the phi node of double reduction, stmt1, and
5666 update all relevant statements. */
5668 /* Go through all the uses of s2 to find double reduction phi
5669 node, i.e., stmt1 above. */
5670 orig_name
= PHI_RESULT (exit_phi
);
5671 FOR_EACH_IMM_USE_STMT (use_stmt
, imm_iter
, orig_name
)
5673 stmt_vec_info use_stmt_vinfo
;
5674 tree vect_phi_init
, preheader_arg
, vect_phi_res
;
5675 basic_block bb
= gimple_bb (use_stmt
);
5677 /* Check that USE_STMT is really double reduction phi
5679 if (gimple_code (use_stmt
) != GIMPLE_PHI
5680 || gimple_phi_num_args (use_stmt
) != 2
5681 || bb
->loop_father
!= outer_loop
)
5683 use_stmt_vinfo
= loop_vinfo
->lookup_stmt (use_stmt
);
5685 || STMT_VINFO_DEF_TYPE (use_stmt_vinfo
)
5686 != vect_double_reduction_def
)
5689 /* Create vector phi node for double reduction:
5690 vs1 = phi <vs0, vs2>
5691 vs1 was created previously in this function by a call to
5692 vect_get_vec_def_for_operand and is stored in
5694 vs2 is defined by INNER_PHI, the vectorized EXIT_PHI;
5695 vs0 is created here. */
5697 /* Create vector phi node. */
5698 vect_phi
= create_phi_node (vec_initial_def
, bb
);
5699 loop_vec_info_for_loop (outer_loop
)->add_stmt (vect_phi
);
5701 /* Create vs0 - initial def of the double reduction phi. */
5702 preheader_arg
= PHI_ARG_DEF_FROM_EDGE (use_stmt
,
5703 loop_preheader_edge (outer_loop
));
5704 vect_phi_init
= get_initial_def_for_reduction
5705 (stmt
, preheader_arg
, NULL
);
5707 /* Update phi node arguments with vs0 and vs2. */
5708 add_phi_arg (vect_phi
, vect_phi_init
,
5709 loop_preheader_edge (outer_loop
),
5711 add_phi_arg (vect_phi
, PHI_RESULT (inner_phi
->stmt
),
5712 loop_latch_edge (outer_loop
), UNKNOWN_LOCATION
);
5713 if (dump_enabled_p ())
5715 dump_printf_loc (MSG_NOTE
, vect_location
,
5716 "created double reduction phi node: ");
5717 dump_gimple_stmt (MSG_NOTE
, TDF_SLIM
, vect_phi
, 0);
5720 vect_phi_res
= PHI_RESULT (vect_phi
);
5722 /* Replace the use, i.e., set the correct vs1 in the regular
5723 reduction phi node. FORNOW, NCOPIES is always 1, so the
5724 loop is redundant. */
5725 stmt_vec_info use_info
= reduction_phi_info
;
5726 for (j
= 0; j
< ncopies
; j
++)
5728 edge pr_edge
= loop_preheader_edge (loop
);
5729 SET_PHI_ARG_DEF (as_a
<gphi
*> (use_info
->stmt
),
5730 pr_edge
->dest_idx
, vect_phi_res
);
5731 use_info
= STMT_VINFO_RELATED_STMT (use_info
);
5738 if (nested_in_vect_loop
)
5747 /* Find the loop-closed-use at the loop exit of the original scalar
5748 result. (The reduction result is expected to have two immediate uses,
5749 one at the latch block, and one at the loop exit). For double
5750 reductions we are looking for exit phis of the outer loop. */
5751 FOR_EACH_IMM_USE_FAST (use_p
, imm_iter
, scalar_dest
)
5753 if (!flow_bb_inside_loop_p (loop
, gimple_bb (USE_STMT (use_p
))))
5755 if (!is_gimple_debug (USE_STMT (use_p
)))
5756 phis
.safe_push (USE_STMT (use_p
));
5760 if (double_reduc
&& gimple_code (USE_STMT (use_p
)) == GIMPLE_PHI
)
5762 tree phi_res
= PHI_RESULT (USE_STMT (use_p
));
5764 FOR_EACH_IMM_USE_FAST (phi_use_p
, phi_imm_iter
, phi_res
)
5766 if (!flow_bb_inside_loop_p (loop
,
5767 gimple_bb (USE_STMT (phi_use_p
)))
5768 && !is_gimple_debug (USE_STMT (phi_use_p
)))
5769 phis
.safe_push (USE_STMT (phi_use_p
));
5775 FOR_EACH_VEC_ELT (phis
, i
, exit_phi
)
5777 /* Replace the uses: */
5778 orig_name
= PHI_RESULT (exit_phi
);
5779 scalar_result
= scalar_results
[k
];
5780 FOR_EACH_IMM_USE_STMT (use_stmt
, imm_iter
, orig_name
)
5781 FOR_EACH_IMM_USE_ON_STMT (use_p
, imm_iter
)
5782 SET_USE (use_p
, scalar_result
);
5789 /* Return a vector of type VECTYPE that is equal to the vector select
5790 operation "MASK ? VEC : IDENTITY". Insert the select statements
5794 merge_with_identity (gimple_stmt_iterator
*gsi
, tree mask
, tree vectype
,
5795 tree vec
, tree identity
)
5797 tree cond
= make_temp_ssa_name (vectype
, NULL
, "cond");
5798 gimple
*new_stmt
= gimple_build_assign (cond
, VEC_COND_EXPR
,
5799 mask
, vec
, identity
);
5800 gsi_insert_before (gsi
, new_stmt
, GSI_SAME_STMT
);
5804 /* Successively apply CODE to each element of VECTOR_RHS, in left-to-right
5805 order, starting with LHS. Insert the extraction statements before GSI and
5806 associate the new scalar SSA names with variable SCALAR_DEST.
5807 Return the SSA name for the result. */
5810 vect_expand_fold_left (gimple_stmt_iterator
*gsi
, tree scalar_dest
,
5811 tree_code code
, tree lhs
, tree vector_rhs
)
5813 tree vectype
= TREE_TYPE (vector_rhs
);
5814 tree scalar_type
= TREE_TYPE (vectype
);
5815 tree bitsize
= TYPE_SIZE (scalar_type
);
5816 unsigned HOST_WIDE_INT vec_size_in_bits
= tree_to_uhwi (TYPE_SIZE (vectype
));
5817 unsigned HOST_WIDE_INT element_bitsize
= tree_to_uhwi (bitsize
);
5819 for (unsigned HOST_WIDE_INT bit_offset
= 0;
5820 bit_offset
< vec_size_in_bits
;
5821 bit_offset
+= element_bitsize
)
5823 tree bitpos
= bitsize_int (bit_offset
);
5824 tree rhs
= build3 (BIT_FIELD_REF
, scalar_type
, vector_rhs
,
5827 gassign
*stmt
= gimple_build_assign (scalar_dest
, rhs
);
5828 rhs
= make_ssa_name (scalar_dest
, stmt
);
5829 gimple_assign_set_lhs (stmt
, rhs
);
5830 gsi_insert_before (gsi
, stmt
, GSI_SAME_STMT
);
5832 stmt
= gimple_build_assign (scalar_dest
, code
, lhs
, rhs
);
5833 tree new_name
= make_ssa_name (scalar_dest
, stmt
);
5834 gimple_assign_set_lhs (stmt
, new_name
);
5835 gsi_insert_before (gsi
, stmt
, GSI_SAME_STMT
);
5841 /* Perform an in-order reduction (FOLD_LEFT_REDUCTION). STMT is the
5842 statement that sets the live-out value. REDUC_DEF_STMT is the phi
5843 statement. CODE is the operation performed by STMT and OPS are
5844 its scalar operands. REDUC_INDEX is the index of the operand in
5845 OPS that is set by REDUC_DEF_STMT. REDUC_FN is the function that
5846 implements in-order reduction, or IFN_LAST if we should open-code it.
5847 VECTYPE_IN is the type of the vector input. MASKS specifies the masks
5848 that should be used to control the operation in a fully-masked loop. */
5851 vectorize_fold_left_reduction (gimple
*stmt
, gimple_stmt_iterator
*gsi
,
5852 stmt_vec_info
*vec_stmt
, slp_tree slp_node
,
5853 gimple
*reduc_def_stmt
,
5854 tree_code code
, internal_fn reduc_fn
,
5855 tree ops
[3], tree vectype_in
,
5856 int reduc_index
, vec_loop_masks
*masks
)
5858 stmt_vec_info stmt_info
= vinfo_for_stmt (stmt
);
5859 loop_vec_info loop_vinfo
= STMT_VINFO_LOOP_VINFO (stmt_info
);
5860 struct loop
*loop
= LOOP_VINFO_LOOP (loop_vinfo
);
5861 tree vectype_out
= STMT_VINFO_VECTYPE (stmt_info
);
5862 stmt_vec_info new_stmt_info
= NULL
;
5868 ncopies
= vect_get_num_copies (loop_vinfo
, vectype_in
);
5870 gcc_assert (!nested_in_vect_loop_p (loop
, stmt
));
5871 gcc_assert (ncopies
== 1);
5872 gcc_assert (TREE_CODE_LENGTH (code
) == binary_op
);
5873 gcc_assert (reduc_index
== (code
== MINUS_EXPR
? 0 : 1));
5874 gcc_assert (STMT_VINFO_VEC_REDUCTION_TYPE (stmt_info
)
5875 == FOLD_LEFT_REDUCTION
);
5878 gcc_assert (known_eq (TYPE_VECTOR_SUBPARTS (vectype_out
),
5879 TYPE_VECTOR_SUBPARTS (vectype_in
)));
5881 tree op0
= ops
[1 - reduc_index
];
5884 stmt_vec_info scalar_dest_def_info
;
5885 auto_vec
<tree
> vec_oprnds0
;
5888 vect_get_vec_defs (op0
, NULL_TREE
, stmt
, &vec_oprnds0
, NULL
, slp_node
);
5889 group_size
= SLP_TREE_SCALAR_STMTS (slp_node
).length ();
5890 scalar_dest_def_info
= SLP_TREE_SCALAR_STMTS (slp_node
)[group_size
- 1];
5894 tree loop_vec_def0
= vect_get_vec_def_for_operand (op0
, stmt
);
5895 vec_oprnds0
.create (1);
5896 vec_oprnds0
.quick_push (loop_vec_def0
);
5897 scalar_dest_def_info
= stmt_info
;
5900 tree scalar_dest
= gimple_assign_lhs (scalar_dest_def_info
->stmt
);
5901 tree scalar_type
= TREE_TYPE (scalar_dest
);
5902 tree reduc_var
= gimple_phi_result (reduc_def_stmt
);
5904 int vec_num
= vec_oprnds0
.length ();
5905 gcc_assert (vec_num
== 1 || slp_node
);
5906 tree vec_elem_type
= TREE_TYPE (vectype_out
);
5907 gcc_checking_assert (useless_type_conversion_p (scalar_type
, vec_elem_type
));
5909 tree vector_identity
= NULL_TREE
;
5910 if (LOOP_VINFO_FULLY_MASKED_P (loop_vinfo
))
5911 vector_identity
= build_zero_cst (vectype_out
);
5913 tree scalar_dest_var
= vect_create_destination_var (scalar_dest
, NULL
);
5916 FOR_EACH_VEC_ELT (vec_oprnds0
, i
, def0
)
5919 tree mask
= NULL_TREE
;
5920 if (LOOP_VINFO_FULLY_MASKED_P (loop_vinfo
))
5921 mask
= vect_get_loop_mask (gsi
, masks
, vec_num
, vectype_in
, i
);
5923 /* Handle MINUS by adding the negative. */
5924 if (reduc_fn
!= IFN_LAST
&& code
== MINUS_EXPR
)
5926 tree negated
= make_ssa_name (vectype_out
);
5927 new_stmt
= gimple_build_assign (negated
, NEGATE_EXPR
, def0
);
5928 gsi_insert_before (gsi
, new_stmt
, GSI_SAME_STMT
);
5933 def0
= merge_with_identity (gsi
, mask
, vectype_out
, def0
,
5936 /* On the first iteration the input is simply the scalar phi
5937 result, and for subsequent iterations it is the output of
5938 the preceding operation. */
5939 if (reduc_fn
!= IFN_LAST
)
5941 new_stmt
= gimple_build_call_internal (reduc_fn
, 2, reduc_var
, def0
);
5942 /* For chained SLP reductions the output of the previous reduction
5943 operation serves as the input of the next. For the final statement
5944 the output cannot be a temporary - we reuse the original
5945 scalar destination of the last statement. */
5946 if (i
!= vec_num
- 1)
5948 gimple_set_lhs (new_stmt
, scalar_dest_var
);
5949 reduc_var
= make_ssa_name (scalar_dest_var
, new_stmt
);
5950 gimple_set_lhs (new_stmt
, reduc_var
);
5955 reduc_var
= vect_expand_fold_left (gsi
, scalar_dest_var
, code
,
5957 new_stmt
= SSA_NAME_DEF_STMT (reduc_var
);
5958 /* Remove the statement, so that we can use the same code paths
5959 as for statements that we've just created. */
5960 gimple_stmt_iterator tmp_gsi
= gsi_for_stmt (new_stmt
);
5961 gsi_remove (&tmp_gsi
, false);
5964 if (i
== vec_num
- 1)
5966 gimple_set_lhs (new_stmt
, scalar_dest
);
5967 new_stmt_info
= vect_finish_replace_stmt (scalar_dest_def_info
,
5971 new_stmt_info
= vect_finish_stmt_generation (scalar_dest_def_info
,
5975 SLP_TREE_VEC_STMTS (slp_node
).quick_push (new_stmt_info
);
5979 STMT_VINFO_VEC_STMT (stmt_info
) = *vec_stmt
= new_stmt_info
;
5984 /* Function is_nonwrapping_integer_induction.
5986 Check if STMT (which is part of loop LOOP) both increments and
5987 does not cause overflow. */
5990 is_nonwrapping_integer_induction (gimple
*stmt
, struct loop
*loop
)
5992 stmt_vec_info stmt_vinfo
= vinfo_for_stmt (stmt
);
5993 tree base
= STMT_VINFO_LOOP_PHI_EVOLUTION_BASE_UNCHANGED (stmt_vinfo
);
5994 tree step
= STMT_VINFO_LOOP_PHI_EVOLUTION_PART (stmt_vinfo
);
5995 tree lhs_type
= TREE_TYPE (gimple_phi_result (stmt
));
5996 widest_int ni
, max_loop_value
, lhs_max
;
5997 wi::overflow_type overflow
= wi::OVF_NONE
;
5999 /* Make sure the loop is integer based. */
6000 if (TREE_CODE (base
) != INTEGER_CST
6001 || TREE_CODE (step
) != INTEGER_CST
)
6004 /* Check that the max size of the loop will not wrap. */
6006 if (TYPE_OVERFLOW_UNDEFINED (lhs_type
))
6009 if (! max_stmt_executions (loop
, &ni
))
6012 max_loop_value
= wi::mul (wi::to_widest (step
), ni
, TYPE_SIGN (lhs_type
),
6017 max_loop_value
= wi::add (wi::to_widest (base
), max_loop_value
,
6018 TYPE_SIGN (lhs_type
), &overflow
);
6022 return (wi::min_precision (max_loop_value
, TYPE_SIGN (lhs_type
))
6023 <= TYPE_PRECISION (lhs_type
));
6026 /* Function vectorizable_reduction.
6028 Check if STMT performs a reduction operation that can be vectorized.
6029 If VEC_STMT is also passed, vectorize the STMT: create a vectorized
6030 stmt to replace it, put it in VEC_STMT, and insert it at GSI.
6031 Return FALSE if not a vectorizable STMT, TRUE otherwise.
6033 This function also handles reduction idioms (patterns) that have been
6034 recognized in advance during vect_pattern_recog. In this case, STMT may be
6036 X = pattern_expr (arg0, arg1, ..., X)
6037 and it's STMT_VINFO_RELATED_STMT points to the last stmt in the original
6038 sequence that had been detected and replaced by the pattern-stmt (STMT).
6040 This function also handles reduction of condition expressions, for example:
6041 for (int i = 0; i < N; i++)
6044 This is handled by vectorising the loop and creating an additional vector
6045 containing the loop indexes for which "a[i] < value" was true. In the
6046 function epilogue this is reduced to a single max value and then used to
6047 index into the vector of results.
6049 In some cases of reduction patterns, the type of the reduction variable X is
6050 different than the type of the other arguments of STMT.
6051 In such cases, the vectype that is used when transforming STMT into a vector
6052 stmt is different than the vectype that is used to determine the
6053 vectorization factor, because it consists of a different number of elements
6054 than the actual number of elements that are being operated upon in parallel.
6056 For example, consider an accumulation of shorts into an int accumulator.
6057 On some targets it's possible to vectorize this pattern operating on 8
6058 shorts at a time (hence, the vectype for purposes of determining the
6059 vectorization factor should be V8HI); on the other hand, the vectype that
6060 is used to create the vector form is actually V4SI (the type of the result).
6062 Upon entry to this function, STMT_VINFO_VECTYPE records the vectype that
6063 indicates what is the actual level of parallelism (V8HI in the example), so
6064 that the right vectorization factor would be derived. This vectype
6065 corresponds to the type of arguments to the reduction stmt, and should *NOT*
6066 be used to create the vectorized stmt. The right vectype for the vectorized
6067 stmt is obtained from the type of the result X:
6068 get_vectype_for_scalar_type (TREE_TYPE (X))
6070 This means that, contrary to "regular" reductions (or "regular" stmts in
6071 general), the following equation:
6072 STMT_VINFO_VECTYPE == get_vectype_for_scalar_type (TREE_TYPE (X))
6073 does *NOT* necessarily hold for reduction patterns. */
6076 vectorizable_reduction (gimple
*stmt
, gimple_stmt_iterator
*gsi
,
6077 stmt_vec_info
*vec_stmt
, slp_tree slp_node
,
6078 slp_instance slp_node_instance
,
6079 stmt_vector_for_cost
*cost_vec
)
6083 stmt_vec_info stmt_info
= vinfo_for_stmt (stmt
);
6084 tree vectype_out
= STMT_VINFO_VECTYPE (stmt_info
);
6085 tree vectype_in
= NULL_TREE
;
6086 loop_vec_info loop_vinfo
= STMT_VINFO_LOOP_VINFO (stmt_info
);
6087 struct loop
*loop
= LOOP_VINFO_LOOP (loop_vinfo
);
6088 enum tree_code code
, orig_code
;
6089 internal_fn reduc_fn
;
6090 machine_mode vec_mode
;
6093 tree new_temp
= NULL_TREE
;
6094 enum vect_def_type dt
, cond_reduc_dt
= vect_unknown_def_type
;
6095 gimple
*cond_reduc_def_stmt
= NULL
;
6096 enum tree_code cond_reduc_op_code
= ERROR_MARK
;
6102 stmt_vec_info prev_stmt_info
, prev_phi_info
;
6103 bool single_defuse_cycle
= false;
6104 stmt_vec_info new_stmt_info
= NULL
;
6107 enum vect_def_type dts
[3];
6108 bool nested_cycle
= false, found_nested_cycle_def
= false;
6109 bool double_reduc
= false;
6111 struct loop
* def_stmt_loop
;
6113 auto_vec
<tree
> vec_oprnds0
;
6114 auto_vec
<tree
> vec_oprnds1
;
6115 auto_vec
<tree
> vec_oprnds2
;
6116 auto_vec
<tree
> vect_defs
;
6117 auto_vec
<stmt_vec_info
> phis
;
6120 tree cr_index_scalar_type
= NULL_TREE
, cr_index_vector_type
= NULL_TREE
;
6121 tree cond_reduc_val
= NULL_TREE
;
6123 /* Make sure it was already recognized as a reduction computation. */
6124 if (STMT_VINFO_DEF_TYPE (vinfo_for_stmt (stmt
)) != vect_reduction_def
6125 && STMT_VINFO_DEF_TYPE (vinfo_for_stmt (stmt
)) != vect_nested_cycle
)
6128 if (nested_in_vect_loop_p (loop
, stmt
))
6131 nested_cycle
= true;
6134 if (REDUC_GROUP_FIRST_ELEMENT (stmt_info
))
6135 gcc_assert (slp_node
6136 && REDUC_GROUP_FIRST_ELEMENT (stmt_info
) == stmt_info
);
6138 if (gimple_code (stmt
) == GIMPLE_PHI
)
6140 tree phi_result
= gimple_phi_result (stmt
);
6141 /* Analysis is fully done on the reduction stmt invocation. */
6145 slp_node_instance
->reduc_phis
= slp_node
;
6147 STMT_VINFO_TYPE (stmt_info
) = reduc_vec_info_type
;
6151 if (STMT_VINFO_REDUC_TYPE (stmt_info
) == FOLD_LEFT_REDUCTION
)
6152 /* Leave the scalar phi in place. Note that checking
6153 STMT_VINFO_VEC_REDUCTION_TYPE (as below) only works
6154 for reductions involving a single statement. */
6157 stmt_vec_info reduc_stmt_info
= STMT_VINFO_REDUC_DEF (stmt_info
);
6158 if (STMT_VINFO_IN_PATTERN_P (reduc_stmt_info
))
6159 reduc_stmt_info
= STMT_VINFO_RELATED_STMT (reduc_stmt_info
);
6161 if (STMT_VINFO_VEC_REDUCTION_TYPE (reduc_stmt_info
)
6162 == EXTRACT_LAST_REDUCTION
)
6163 /* Leave the scalar phi in place. */
6166 gassign
*reduc_stmt
= as_a
<gassign
*> (reduc_stmt_info
->stmt
);
6167 for (unsigned k
= 1; k
< gimple_num_ops (reduc_stmt
); ++k
)
6169 tree op
= gimple_op (reduc_stmt
, k
);
6170 if (op
== gimple_phi_result (stmt
))
6173 && gimple_assign_rhs_code (reduc_stmt
) == COND_EXPR
)
6176 || (GET_MODE_SIZE (SCALAR_TYPE_MODE (TREE_TYPE (vectype_in
)))
6177 < GET_MODE_SIZE (SCALAR_TYPE_MODE (TREE_TYPE (op
)))))
6178 vectype_in
= get_vectype_for_scalar_type (TREE_TYPE (op
));
6181 gcc_assert (vectype_in
);
6186 ncopies
= vect_get_num_copies (loop_vinfo
, vectype_in
);
6188 stmt_vec_info use_stmt_info
;
6190 && STMT_VINFO_RELEVANT (reduc_stmt_info
) <= vect_used_only_live
6191 && (use_stmt_info
= loop_vinfo
->lookup_single_use (phi_result
))
6192 && (use_stmt_info
== reduc_stmt_info
6193 || STMT_VINFO_RELATED_STMT (use_stmt_info
) == reduc_stmt
))
6194 single_defuse_cycle
= true;
6196 /* Create the destination vector */
6197 scalar_dest
= gimple_assign_lhs (reduc_stmt
);
6198 vec_dest
= vect_create_destination_var (scalar_dest
, vectype_out
);
6201 /* The size vect_schedule_slp_instance computes is off for us. */
6202 vec_num
= vect_get_num_vectors
6203 (LOOP_VINFO_VECT_FACTOR (loop_vinfo
)
6204 * SLP_TREE_SCALAR_STMTS (slp_node
).length (),
6209 /* Generate the reduction PHIs upfront. */
6210 prev_phi_info
= NULL
;
6211 for (j
= 0; j
< ncopies
; j
++)
6213 if (j
== 0 || !single_defuse_cycle
)
6215 for (i
= 0; i
< vec_num
; i
++)
6217 /* Create the reduction-phi that defines the reduction
6219 gimple
*new_phi
= create_phi_node (vec_dest
, loop
->header
);
6220 stmt_vec_info new_phi_info
= loop_vinfo
->add_stmt (new_phi
);
6223 SLP_TREE_VEC_STMTS (slp_node
).quick_push (new_phi_info
);
6227 STMT_VINFO_VEC_STMT (stmt_info
)
6228 = *vec_stmt
= new_phi_info
;
6230 STMT_VINFO_RELATED_STMT (prev_phi_info
) = new_phi_info
;
6231 prev_phi_info
= new_phi_info
;
6240 /* 1. Is vectorizable reduction? */
6241 /* Not supportable if the reduction variable is used in the loop, unless
6242 it's a reduction chain. */
6243 if (STMT_VINFO_RELEVANT (stmt_info
) > vect_used_in_outer
6244 && !REDUC_GROUP_FIRST_ELEMENT (stmt_info
))
6247 /* Reductions that are not used even in an enclosing outer-loop,
6248 are expected to be "live" (used out of the loop). */
6249 if (STMT_VINFO_RELEVANT (stmt_info
) == vect_unused_in_scope
6250 && !STMT_VINFO_LIVE_P (stmt_info
))
6253 /* 2. Has this been recognized as a reduction pattern?
6255 Check if STMT represents a pattern that has been recognized
6256 in earlier analysis stages. For stmts that represent a pattern,
6257 the STMT_VINFO_RELATED_STMT field records the last stmt in
6258 the original sequence that constitutes the pattern. */
6260 stmt_vec_info orig_stmt_info
= STMT_VINFO_RELATED_STMT (stmt_info
);
6263 gcc_assert (STMT_VINFO_IN_PATTERN_P (orig_stmt_info
));
6264 gcc_assert (!STMT_VINFO_IN_PATTERN_P (stmt_info
));
6267 /* 3. Check the operands of the operation. The first operands are defined
6268 inside the loop body. The last operand is the reduction variable,
6269 which is defined by the loop-header-phi. */
6271 gcc_assert (is_gimple_assign (stmt
));
6274 switch (get_gimple_rhs_class (gimple_assign_rhs_code (stmt
)))
6276 case GIMPLE_BINARY_RHS
:
6277 code
= gimple_assign_rhs_code (stmt
);
6278 op_type
= TREE_CODE_LENGTH (code
);
6279 gcc_assert (op_type
== binary_op
);
6280 ops
[0] = gimple_assign_rhs1 (stmt
);
6281 ops
[1] = gimple_assign_rhs2 (stmt
);
6284 case GIMPLE_TERNARY_RHS
:
6285 code
= gimple_assign_rhs_code (stmt
);
6286 op_type
= TREE_CODE_LENGTH (code
);
6287 gcc_assert (op_type
== ternary_op
);
6288 ops
[0] = gimple_assign_rhs1 (stmt
);
6289 ops
[1] = gimple_assign_rhs2 (stmt
);
6290 ops
[2] = gimple_assign_rhs3 (stmt
);
6293 case GIMPLE_UNARY_RHS
:
6300 if (code
== COND_EXPR
&& slp_node
)
6303 scalar_dest
= gimple_assign_lhs (stmt
);
6304 scalar_type
= TREE_TYPE (scalar_dest
);
6305 if (!POINTER_TYPE_P (scalar_type
) && !INTEGRAL_TYPE_P (scalar_type
)
6306 && !SCALAR_FLOAT_TYPE_P (scalar_type
))
6309 /* Do not try to vectorize bit-precision reductions. */
6310 if (!type_has_mode_precision_p (scalar_type
))
6313 /* All uses but the last are expected to be defined in the loop.
6314 The last use is the reduction variable. In case of nested cycle this
6315 assumption is not true: we use reduc_index to record the index of the
6316 reduction variable. */
6317 stmt_vec_info reduc_def_info
= NULL
;
6318 int reduc_index
= -1;
6319 for (i
= 0; i
< op_type
; i
++)
6321 /* The condition of COND_EXPR is checked in vectorizable_condition(). */
6322 if (i
== 0 && code
== COND_EXPR
)
6325 stmt_vec_info def_stmt_info
;
6326 is_simple_use
= vect_is_simple_use (ops
[i
], loop_vinfo
, &dts
[i
], &tem
,
6329 gcc_assert (is_simple_use
);
6330 if (dt
== vect_reduction_def
)
6332 reduc_def_info
= def_stmt_info
;
6338 /* To properly compute ncopies we are interested in the widest
6339 input type in case we're looking at a widening accumulation. */
6341 || (GET_MODE_SIZE (SCALAR_TYPE_MODE (TREE_TYPE (vectype_in
)))
6342 < GET_MODE_SIZE (SCALAR_TYPE_MODE (TREE_TYPE (tem
)))))
6346 if (dt
!= vect_internal_def
6347 && dt
!= vect_external_def
6348 && dt
!= vect_constant_def
6349 && dt
!= vect_induction_def
6350 && !(dt
== vect_nested_cycle
&& nested_cycle
))
6353 if (dt
== vect_nested_cycle
)
6355 found_nested_cycle_def
= true;
6356 reduc_def_info
= def_stmt_info
;
6360 if (i
== 1 && code
== COND_EXPR
)
6362 /* Record how value of COND_EXPR is defined. */
6363 if (dt
== vect_constant_def
)
6366 cond_reduc_val
= ops
[i
];
6368 if (dt
== vect_induction_def
6370 && is_nonwrapping_integer_induction (def_stmt_info
, loop
))
6373 cond_reduc_def_stmt
= def_stmt_info
;
6379 vectype_in
= vectype_out
;
6381 /* When vectorizing a reduction chain w/o SLP the reduction PHI is not
6382 directy used in stmt. */
6383 if (reduc_index
== -1)
6385 if (STMT_VINFO_REDUC_TYPE (stmt_info
) == FOLD_LEFT_REDUCTION
)
6387 if (dump_enabled_p ())
6388 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
6389 "in-order reduction chain without SLP.\n");
6394 reduc_def_info
= STMT_VINFO_REDUC_DEF (orig_stmt_info
);
6396 reduc_def_info
= STMT_VINFO_REDUC_DEF (stmt_info
);
6399 if (! reduc_def_info
)
6402 gphi
*reduc_def_phi
= dyn_cast
<gphi
*> (reduc_def_info
->stmt
);
6406 if (!(reduc_index
== -1
6407 || dts
[reduc_index
] == vect_reduction_def
6408 || dts
[reduc_index
] == vect_nested_cycle
6409 || ((dts
[reduc_index
] == vect_internal_def
6410 || dts
[reduc_index
] == vect_external_def
6411 || dts
[reduc_index
] == vect_constant_def
6412 || dts
[reduc_index
] == vect_induction_def
)
6413 && nested_cycle
&& found_nested_cycle_def
)))
6415 /* For pattern recognized stmts, orig_stmt might be a reduction,
6416 but some helper statements for the pattern might not, or
6417 might be COND_EXPRs with reduction uses in the condition. */
6418 gcc_assert (orig_stmt_info
);
6422 /* PHIs should not participate in patterns. */
6423 gcc_assert (!STMT_VINFO_RELATED_STMT (reduc_def_info
));
6424 enum vect_reduction_type v_reduc_type
6425 = STMT_VINFO_REDUC_TYPE (reduc_def_info
);
6426 stmt_vec_info tmp
= STMT_VINFO_REDUC_DEF (reduc_def_info
);
6428 STMT_VINFO_VEC_REDUCTION_TYPE (stmt_info
) = v_reduc_type
;
6429 /* If we have a condition reduction, see if we can simplify it further. */
6430 if (v_reduc_type
== COND_REDUCTION
)
6432 /* TODO: We can't yet handle reduction chains, since we need to treat
6433 each COND_EXPR in the chain specially, not just the last one.
6436 x_1 = PHI <x_3, ...>
6437 x_2 = a_2 ? ... : x_1;
6438 x_3 = a_3 ? ... : x_2;
6440 we're interested in the last element in x_3 for which a_2 || a_3
6441 is true, whereas the current reduction chain handling would
6442 vectorize x_2 as a normal VEC_COND_EXPR and only treat x_3
6443 as a reduction operation. */
6444 if (reduc_index
== -1)
6446 if (dump_enabled_p ())
6447 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
6448 "conditional reduction chains not supported\n");
6452 /* vect_is_simple_reduction ensured that operand 2 is the
6453 loop-carried operand. */
6454 gcc_assert (reduc_index
== 2);
6456 /* Loop peeling modifies initial value of reduction PHI, which
6457 makes the reduction stmt to be transformed different to the
6458 original stmt analyzed. We need to record reduction code for
6459 CONST_COND_REDUCTION type reduction at analyzing stage, thus
6460 it can be used directly at transform stage. */
6461 if (STMT_VINFO_VEC_CONST_COND_REDUC_CODE (stmt_info
) == MAX_EXPR
6462 || STMT_VINFO_VEC_CONST_COND_REDUC_CODE (stmt_info
) == MIN_EXPR
)
6464 /* Also set the reduction type to CONST_COND_REDUCTION. */
6465 gcc_assert (cond_reduc_dt
== vect_constant_def
);
6466 STMT_VINFO_VEC_REDUCTION_TYPE (stmt_info
) = CONST_COND_REDUCTION
;
6468 else if (direct_internal_fn_supported_p (IFN_FOLD_EXTRACT_LAST
,
6469 vectype_in
, OPTIMIZE_FOR_SPEED
))
6471 if (dump_enabled_p ())
6472 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
6473 "optimizing condition reduction with"
6474 " FOLD_EXTRACT_LAST.\n");
6475 STMT_VINFO_VEC_REDUCTION_TYPE (stmt_info
) = EXTRACT_LAST_REDUCTION
;
6477 else if (cond_reduc_dt
== vect_induction_def
)
6479 stmt_vec_info cond_stmt_vinfo
= vinfo_for_stmt (cond_reduc_def_stmt
);
6481 = STMT_VINFO_LOOP_PHI_EVOLUTION_BASE_UNCHANGED (cond_stmt_vinfo
);
6482 tree step
= STMT_VINFO_LOOP_PHI_EVOLUTION_PART (cond_stmt_vinfo
);
6484 gcc_assert (TREE_CODE (base
) == INTEGER_CST
6485 && TREE_CODE (step
) == INTEGER_CST
);
6486 cond_reduc_val
= NULL_TREE
;
6487 /* Find a suitable value, for MAX_EXPR below base, for MIN_EXPR
6488 above base; punt if base is the minimum value of the type for
6489 MAX_EXPR or maximum value of the type for MIN_EXPR for now. */
6490 if (tree_int_cst_sgn (step
) == -1)
6492 cond_reduc_op_code
= MIN_EXPR
;
6493 if (tree_int_cst_sgn (base
) == -1)
6494 cond_reduc_val
= build_int_cst (TREE_TYPE (base
), 0);
6495 else if (tree_int_cst_lt (base
,
6496 TYPE_MAX_VALUE (TREE_TYPE (base
))))
6498 = int_const_binop (PLUS_EXPR
, base
, integer_one_node
);
6502 cond_reduc_op_code
= MAX_EXPR
;
6503 if (tree_int_cst_sgn (base
) == 1)
6504 cond_reduc_val
= build_int_cst (TREE_TYPE (base
), 0);
6505 else if (tree_int_cst_lt (TYPE_MIN_VALUE (TREE_TYPE (base
)),
6508 = int_const_binop (MINUS_EXPR
, base
, integer_one_node
);
6512 if (dump_enabled_p ())
6513 dump_printf_loc (MSG_NOTE
, vect_location
,
6514 "condition expression based on "
6515 "integer induction.\n");
6516 STMT_VINFO_VEC_REDUCTION_TYPE (stmt_info
)
6517 = INTEGER_INDUC_COND_REDUCTION
;
6520 else if (cond_reduc_dt
== vect_constant_def
)
6522 enum vect_def_type cond_initial_dt
;
6523 gimple
*def_stmt
= SSA_NAME_DEF_STMT (ops
[reduc_index
]);
6524 tree cond_initial_val
6525 = PHI_ARG_DEF_FROM_EDGE (def_stmt
, loop_preheader_edge (loop
));
6527 gcc_assert (cond_reduc_val
!= NULL_TREE
);
6528 vect_is_simple_use (cond_initial_val
, loop_vinfo
, &cond_initial_dt
);
6529 if (cond_initial_dt
== vect_constant_def
6530 && types_compatible_p (TREE_TYPE (cond_initial_val
),
6531 TREE_TYPE (cond_reduc_val
)))
6533 tree e
= fold_binary (LE_EXPR
, boolean_type_node
,
6534 cond_initial_val
, cond_reduc_val
);
6535 if (e
&& (integer_onep (e
) || integer_zerop (e
)))
6537 if (dump_enabled_p ())
6538 dump_printf_loc (MSG_NOTE
, vect_location
,
6539 "condition expression based on "
6540 "compile time constant.\n");
6541 /* Record reduction code at analysis stage. */
6542 STMT_VINFO_VEC_CONST_COND_REDUC_CODE (stmt_info
)
6543 = integer_onep (e
) ? MAX_EXPR
: MIN_EXPR
;
6544 STMT_VINFO_VEC_REDUCTION_TYPE (stmt_info
)
6545 = CONST_COND_REDUCTION
;
6552 gcc_assert (tmp
== orig_stmt_info
6553 || REDUC_GROUP_FIRST_ELEMENT (tmp
) == orig_stmt_info
);
6555 /* We changed STMT to be the first stmt in reduction chain, hence we
6556 check that in this case the first element in the chain is STMT. */
6557 gcc_assert (tmp
== stmt_info
6558 || REDUC_GROUP_FIRST_ELEMENT (tmp
) == stmt_info
);
6560 if (STMT_VINFO_LIVE_P (reduc_def_info
))
6566 ncopies
= vect_get_num_copies (loop_vinfo
, vectype_in
);
6568 gcc_assert (ncopies
>= 1);
6570 vec_mode
= TYPE_MODE (vectype_in
);
6571 poly_uint64 nunits_out
= TYPE_VECTOR_SUBPARTS (vectype_out
);
6573 if (code
== COND_EXPR
)
6575 /* Only call during the analysis stage, otherwise we'll lose
6577 if (!vec_stmt
&& !vectorizable_condition (stmt
, gsi
, NULL
,
6578 ops
[reduc_index
], 0, NULL
,
6581 if (dump_enabled_p ())
6582 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
6583 "unsupported condition in reduction\n");
6589 /* 4. Supportable by target? */
6591 if (code
== LSHIFT_EXPR
|| code
== RSHIFT_EXPR
6592 || code
== LROTATE_EXPR
|| code
== RROTATE_EXPR
)
6594 /* Shifts and rotates are only supported by vectorizable_shifts,
6595 not vectorizable_reduction. */
6596 if (dump_enabled_p ())
6597 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
6598 "unsupported shift or rotation.\n");
6602 /* 4.1. check support for the operation in the loop */
6603 optab
= optab_for_tree_code (code
, vectype_in
, optab_default
);
6606 if (dump_enabled_p ())
6607 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
6613 if (optab_handler (optab
, vec_mode
) == CODE_FOR_nothing
)
6615 if (dump_enabled_p ())
6616 dump_printf (MSG_NOTE
, "op not supported by target.\n");
6618 if (maybe_ne (GET_MODE_SIZE (vec_mode
), UNITS_PER_WORD
)
6619 || !vect_worthwhile_without_simd_p (loop_vinfo
, code
))
6622 if (dump_enabled_p ())
6623 dump_printf (MSG_NOTE
, "proceeding using word mode.\n");
6626 /* Worthwhile without SIMD support? */
6627 if (!VECTOR_MODE_P (TYPE_MODE (vectype_in
))
6628 && !vect_worthwhile_without_simd_p (loop_vinfo
, code
))
6630 if (dump_enabled_p ())
6631 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
6632 "not worthwhile without SIMD support.\n");
6638 /* 4.2. Check support for the epilog operation.
6640 If STMT represents a reduction pattern, then the type of the
6641 reduction variable may be different than the type of the rest
6642 of the arguments. For example, consider the case of accumulation
6643 of shorts into an int accumulator; The original code:
6644 S1: int_a = (int) short_a;
6645 orig_stmt-> S2: int_acc = plus <int_a ,int_acc>;
6648 STMT: int_acc = widen_sum <short_a, int_acc>
6651 1. The tree-code that is used to create the vector operation in the
6652 epilog code (that reduces the partial results) is not the
6653 tree-code of STMT, but is rather the tree-code of the original
6654 stmt from the pattern that STMT is replacing. I.e, in the example
6655 above we want to use 'widen_sum' in the loop, but 'plus' in the
6657 2. The type (mode) we use to check available target support
6658 for the vector operation to be created in the *epilog*, is
6659 determined by the type of the reduction variable (in the example
6660 above we'd check this: optab_handler (plus_optab, vect_int_mode])).
6661 However the type (mode) we use to check available target support
6662 for the vector operation to be created *inside the loop*, is
6663 determined by the type of the other arguments to STMT (in the
6664 example we'd check this: optab_handler (widen_sum_optab,
6667 This is contrary to "regular" reductions, in which the types of all
6668 the arguments are the same as the type of the reduction variable.
6669 For "regular" reductions we can therefore use the same vector type
6670 (and also the same tree-code) when generating the epilog code and
6671 when generating the code inside the loop. */
6673 vect_reduction_type reduction_type
6674 = STMT_VINFO_VEC_REDUCTION_TYPE (stmt_info
);
6676 && (reduction_type
== TREE_CODE_REDUCTION
6677 || reduction_type
== FOLD_LEFT_REDUCTION
))
6679 /* This is a reduction pattern: get the vectype from the type of the
6680 reduction variable, and get the tree-code from orig_stmt. */
6681 orig_code
= gimple_assign_rhs_code (orig_stmt_info
->stmt
);
6682 gcc_assert (vectype_out
);
6683 vec_mode
= TYPE_MODE (vectype_out
);
6687 /* Regular reduction: use the same vectype and tree-code as used for
6688 the vector code inside the loop can be used for the epilog code. */
6691 if (code
== MINUS_EXPR
)
6692 orig_code
= PLUS_EXPR
;
6694 /* For simple condition reductions, replace with the actual expression
6695 we want to base our reduction around. */
6696 if (reduction_type
== CONST_COND_REDUCTION
)
6698 orig_code
= STMT_VINFO_VEC_CONST_COND_REDUC_CODE (stmt_info
);
6699 gcc_assert (orig_code
== MAX_EXPR
|| orig_code
== MIN_EXPR
);
6701 else if (reduction_type
== INTEGER_INDUC_COND_REDUCTION
)
6702 orig_code
= cond_reduc_op_code
;
6707 def_bb
= gimple_bb (reduc_def_phi
);
6708 def_stmt_loop
= def_bb
->loop_father
;
6709 def_arg
= PHI_ARG_DEF_FROM_EDGE (reduc_def_phi
,
6710 loop_preheader_edge (def_stmt_loop
));
6711 stmt_vec_info def_arg_stmt_info
= loop_vinfo
->lookup_def (def_arg
);
6712 if (def_arg_stmt_info
6713 && (STMT_VINFO_DEF_TYPE (def_arg_stmt_info
)
6714 == vect_double_reduction_def
))
6715 double_reduc
= true;
6718 reduc_fn
= IFN_LAST
;
6720 if (reduction_type
== TREE_CODE_REDUCTION
6721 || reduction_type
== FOLD_LEFT_REDUCTION
6722 || reduction_type
== INTEGER_INDUC_COND_REDUCTION
6723 || reduction_type
== CONST_COND_REDUCTION
)
6725 if (reduction_type
== FOLD_LEFT_REDUCTION
6726 ? fold_left_reduction_fn (orig_code
, &reduc_fn
)
6727 : reduction_fn_for_scalar_code (orig_code
, &reduc_fn
))
6729 if (reduc_fn
!= IFN_LAST
6730 && !direct_internal_fn_supported_p (reduc_fn
, vectype_out
,
6731 OPTIMIZE_FOR_SPEED
))
6733 if (dump_enabled_p ())
6734 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
6735 "reduc op not supported by target.\n");
6737 reduc_fn
= IFN_LAST
;
6742 if (!nested_cycle
|| double_reduc
)
6744 if (dump_enabled_p ())
6745 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
6746 "no reduc code for scalar code.\n");
6752 else if (reduction_type
== COND_REDUCTION
)
6754 int scalar_precision
6755 = GET_MODE_PRECISION (SCALAR_TYPE_MODE (scalar_type
));
6756 cr_index_scalar_type
= make_unsigned_type (scalar_precision
);
6757 cr_index_vector_type
= build_vector_type (cr_index_scalar_type
,
6760 if (direct_internal_fn_supported_p (IFN_REDUC_MAX
, cr_index_vector_type
,
6761 OPTIMIZE_FOR_SPEED
))
6762 reduc_fn
= IFN_REDUC_MAX
;
6765 if (reduction_type
!= EXTRACT_LAST_REDUCTION
6766 && reduc_fn
== IFN_LAST
6767 && !nunits_out
.is_constant ())
6769 if (dump_enabled_p ())
6770 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
6771 "missing target support for reduction on"
6772 " variable-length vectors.\n");
6776 if ((double_reduc
|| reduction_type
!= TREE_CODE_REDUCTION
)
6779 if (dump_enabled_p ())
6780 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
6781 "multiple types in double reduction or condition "
6786 /* For SLP reductions, see if there is a neutral value we can use. */
6787 tree neutral_op
= NULL_TREE
;
6789 neutral_op
= neutral_op_for_slp_reduction
6790 (slp_node_instance
->reduc_phis
, code
,
6791 REDUC_GROUP_FIRST_ELEMENT (stmt_info
) != NULL_STMT_VEC_INFO
);
6793 if (double_reduc
&& reduction_type
== FOLD_LEFT_REDUCTION
)
6795 /* We can't support in-order reductions of code such as this:
6797 for (int i = 0; i < n1; ++i)
6798 for (int j = 0; j < n2; ++j)
6801 since GCC effectively transforms the loop when vectorizing:
6803 for (int i = 0; i < n1 / VF; ++i)
6804 for (int j = 0; j < n2; ++j)
6805 for (int k = 0; k < VF; ++k)
6808 which is a reassociation of the original operation. */
6809 if (dump_enabled_p ())
6810 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
6811 "in-order double reduction not supported.\n");
6816 if (reduction_type
== FOLD_LEFT_REDUCTION
6818 && !REDUC_GROUP_FIRST_ELEMENT (vinfo_for_stmt (stmt
)))
6820 /* We cannot use in-order reductions in this case because there is
6821 an implicit reassociation of the operations involved. */
6822 if (dump_enabled_p ())
6823 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
6824 "in-order unchained SLP reductions not supported.\n");
6828 /* For double reductions, and for SLP reductions with a neutral value,
6829 we construct a variable-length initial vector by loading a vector
6830 full of the neutral value and then shift-and-inserting the start
6831 values into the low-numbered elements. */
6832 if ((double_reduc
|| neutral_op
)
6833 && !nunits_out
.is_constant ()
6834 && !direct_internal_fn_supported_p (IFN_VEC_SHL_INSERT
,
6835 vectype_out
, OPTIMIZE_FOR_SPEED
))
6837 if (dump_enabled_p ())
6838 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
6839 "reduction on variable-length vectors requires"
6840 " target support for a vector-shift-and-insert"
6845 /* Check extra constraints for variable-length unchained SLP reductions. */
6846 if (STMT_SLP_TYPE (stmt_info
)
6847 && !REDUC_GROUP_FIRST_ELEMENT (vinfo_for_stmt (stmt
))
6848 && !nunits_out
.is_constant ())
6850 /* We checked above that we could build the initial vector when
6851 there's a neutral element value. Check here for the case in
6852 which each SLP statement has its own initial value and in which
6853 that value needs to be repeated for every instance of the
6854 statement within the initial vector. */
6855 unsigned int group_size
= SLP_TREE_SCALAR_STMTS (slp_node
).length ();
6856 scalar_mode elt_mode
= SCALAR_TYPE_MODE (TREE_TYPE (vectype_out
));
6858 && !can_duplicate_and_interleave_p (group_size
, elt_mode
))
6860 if (dump_enabled_p ())
6861 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
6862 "unsupported form of SLP reduction for"
6863 " variable-length vectors: cannot build"
6864 " initial vector.\n");
6867 /* The epilogue code relies on the number of elements being a multiple
6868 of the group size. The duplicate-and-interleave approach to setting
6869 up the the initial vector does too. */
6870 if (!multiple_p (nunits_out
, group_size
))
6872 if (dump_enabled_p ())
6873 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
6874 "unsupported form of SLP reduction for"
6875 " variable-length vectors: the vector size"
6876 " is not a multiple of the number of results.\n");
6881 /* In case of widenning multiplication by a constant, we update the type
6882 of the constant to be the type of the other operand. We check that the
6883 constant fits the type in the pattern recognition pass. */
6884 if (code
== DOT_PROD_EXPR
6885 && !types_compatible_p (TREE_TYPE (ops
[0]), TREE_TYPE (ops
[1])))
6887 if (TREE_CODE (ops
[0]) == INTEGER_CST
)
6888 ops
[0] = fold_convert (TREE_TYPE (ops
[1]), ops
[0]);
6889 else if (TREE_CODE (ops
[1]) == INTEGER_CST
)
6890 ops
[1] = fold_convert (TREE_TYPE (ops
[0]), ops
[1]);
6893 if (dump_enabled_p ())
6894 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
6895 "invalid types in dot-prod\n");
6901 if (reduction_type
== COND_REDUCTION
)
6905 if (! max_loop_iterations (loop
, &ni
))
6907 if (dump_enabled_p ())
6908 dump_printf_loc (MSG_NOTE
, vect_location
,
6909 "loop count not known, cannot create cond "
6913 /* Convert backedges to iterations. */
6916 /* The additional index will be the same type as the condition. Check
6917 that the loop can fit into this less one (because we'll use up the
6918 zero slot for when there are no matches). */
6919 tree max_index
= TYPE_MAX_VALUE (cr_index_scalar_type
);
6920 if (wi::geu_p (ni
, wi::to_widest (max_index
)))
6922 if (dump_enabled_p ())
6923 dump_printf_loc (MSG_NOTE
, vect_location
,
6924 "loop size is greater than data size.\n");
6929 /* In case the vectorization factor (VF) is bigger than the number
6930 of elements that we can fit in a vectype (nunits), we have to generate
6931 more than one vector stmt - i.e - we need to "unroll" the
6932 vector stmt by a factor VF/nunits. For more details see documentation
6933 in vectorizable_operation. */
6935 /* If the reduction is used in an outer loop we need to generate
6936 VF intermediate results, like so (e.g. for ncopies=2):
6941 (i.e. we generate VF results in 2 registers).
6942 In this case we have a separate def-use cycle for each copy, and therefore
6943 for each copy we get the vector def for the reduction variable from the
6944 respective phi node created for this copy.
6946 Otherwise (the reduction is unused in the loop nest), we can combine
6947 together intermediate results, like so (e.g. for ncopies=2):
6951 (i.e. we generate VF/2 results in a single register).
6952 In this case for each copy we get the vector def for the reduction variable
6953 from the vectorized reduction operation generated in the previous iteration.
6955 This only works when we see both the reduction PHI and its only consumer
6956 in vectorizable_reduction and there are no intermediate stmts
6958 stmt_vec_info use_stmt_info
;
6959 tree reduc_phi_result
= gimple_phi_result (reduc_def_phi
);
6961 && (STMT_VINFO_RELEVANT (stmt_info
) <= vect_used_only_live
)
6962 && (use_stmt_info
= loop_vinfo
->lookup_single_use (reduc_phi_result
))
6963 && (use_stmt_info
== stmt_info
6964 || STMT_VINFO_RELATED_STMT (use_stmt_info
) == stmt
))
6966 single_defuse_cycle
= true;
6970 epilog_copies
= ncopies
;
6972 /* If the reduction stmt is one of the patterns that have lane
6973 reduction embedded we cannot handle the case of ! single_defuse_cycle. */
6975 && ! single_defuse_cycle
)
6976 && (code
== DOT_PROD_EXPR
6977 || code
== WIDEN_SUM_EXPR
6978 || code
== SAD_EXPR
))
6980 if (dump_enabled_p ())
6981 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
6982 "multi def-use cycle not possible for lane-reducing "
6983 "reduction operation\n");
6988 vec_num
= SLP_TREE_NUMBER_OF_VEC_STMTS (slp_node
);
6992 internal_fn cond_fn
= get_conditional_internal_fn (code
);
6993 vec_loop_masks
*masks
= &LOOP_VINFO_MASKS (loop_vinfo
);
6995 if (!vec_stmt
) /* transformation not required. */
6997 vect_model_reduction_cost (stmt_info
, reduc_fn
, ncopies
, cost_vec
);
6998 if (loop_vinfo
&& LOOP_VINFO_CAN_FULLY_MASK_P (loop_vinfo
))
7000 if (reduction_type
!= FOLD_LEFT_REDUCTION
7001 && (cond_fn
== IFN_LAST
7002 || !direct_internal_fn_supported_p (cond_fn
, vectype_in
,
7003 OPTIMIZE_FOR_SPEED
)))
7005 if (dump_enabled_p ())
7006 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
7007 "can't use a fully-masked loop because no"
7008 " conditional operation is available.\n");
7009 LOOP_VINFO_CAN_FULLY_MASK_P (loop_vinfo
) = false;
7011 else if (reduc_index
== -1)
7013 if (dump_enabled_p ())
7014 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
7015 "can't use a fully-masked loop for chained"
7017 LOOP_VINFO_CAN_FULLY_MASK_P (loop_vinfo
) = false;
7020 vect_record_loop_mask (loop_vinfo
, masks
, ncopies
* vec_num
,
7023 if (dump_enabled_p ()
7024 && reduction_type
== FOLD_LEFT_REDUCTION
)
7025 dump_printf_loc (MSG_NOTE
, vect_location
,
7026 "using an in-order (fold-left) reduction.\n");
7027 STMT_VINFO_TYPE (stmt_info
) = reduc_vec_info_type
;
7033 if (dump_enabled_p ())
7034 dump_printf_loc (MSG_NOTE
, vect_location
, "transform reduction.\n");
7036 /* FORNOW: Multiple types are not supported for condition. */
7037 if (code
== COND_EXPR
)
7038 gcc_assert (ncopies
== 1);
7040 bool masked_loop_p
= LOOP_VINFO_FULLY_MASKED_P (loop_vinfo
);
7042 if (reduction_type
== FOLD_LEFT_REDUCTION
)
7043 return vectorize_fold_left_reduction
7044 (stmt
, gsi
, vec_stmt
, slp_node
, reduc_def_phi
, code
,
7045 reduc_fn
, ops
, vectype_in
, reduc_index
, masks
);
7047 if (reduction_type
== EXTRACT_LAST_REDUCTION
)
7049 gcc_assert (!slp_node
);
7050 return vectorizable_condition (stmt
, gsi
, vec_stmt
,
7051 NULL
, reduc_index
, NULL
, NULL
);
7054 /* Create the destination vector */
7055 vec_dest
= vect_create_destination_var (scalar_dest
, vectype_out
);
7057 prev_stmt_info
= NULL
;
7058 prev_phi_info
= NULL
;
7061 vec_oprnds0
.create (1);
7062 vec_oprnds1
.create (1);
7063 if (op_type
== ternary_op
)
7064 vec_oprnds2
.create (1);
7067 phis
.create (vec_num
);
7068 vect_defs
.create (vec_num
);
7070 vect_defs
.quick_push (NULL_TREE
);
7073 phis
.splice (SLP_TREE_VEC_STMTS (slp_node_instance
->reduc_phis
));
7075 phis
.quick_push (STMT_VINFO_VEC_STMT (reduc_def_info
));
7077 for (j
= 0; j
< ncopies
; j
++)
7079 if (code
== COND_EXPR
)
7081 gcc_assert (!slp_node
);
7082 vectorizable_condition (stmt
, gsi
, vec_stmt
,
7083 PHI_RESULT (phis
[0]->stmt
),
7084 reduc_index
, NULL
, NULL
);
7085 /* Multiple types are not supported for condition. */
7094 /* Get vec defs for all the operands except the reduction index,
7095 ensuring the ordering of the ops in the vector is kept. */
7096 auto_vec
<tree
, 3> slp_ops
;
7097 auto_vec
<vec
<tree
>, 3> vec_defs
;
7099 slp_ops
.quick_push (ops
[0]);
7100 slp_ops
.quick_push (ops
[1]);
7101 if (op_type
== ternary_op
)
7102 slp_ops
.quick_push (ops
[2]);
7104 vect_get_slp_defs (slp_ops
, slp_node
, &vec_defs
);
7106 vec_oprnds0
.safe_splice (vec_defs
[0]);
7107 vec_defs
[0].release ();
7108 vec_oprnds1
.safe_splice (vec_defs
[1]);
7109 vec_defs
[1].release ();
7110 if (op_type
== ternary_op
)
7112 vec_oprnds2
.safe_splice (vec_defs
[2]);
7113 vec_defs
[2].release ();
7118 vec_oprnds0
.quick_push
7119 (vect_get_vec_def_for_operand (ops
[0], stmt
));
7120 vec_oprnds1
.quick_push
7121 (vect_get_vec_def_for_operand (ops
[1], stmt
));
7122 if (op_type
== ternary_op
)
7123 vec_oprnds2
.quick_push
7124 (vect_get_vec_def_for_operand (ops
[2], stmt
));
7131 gcc_assert (reduc_index
!= -1 || ! single_defuse_cycle
);
7133 if (single_defuse_cycle
&& reduc_index
== 0)
7134 vec_oprnds0
[0] = gimple_get_lhs (new_stmt_info
->stmt
);
7137 = vect_get_vec_def_for_stmt_copy (dts
[0], vec_oprnds0
[0]);
7138 if (single_defuse_cycle
&& reduc_index
== 1)
7139 vec_oprnds1
[0] = gimple_get_lhs (new_stmt_info
->stmt
);
7142 = vect_get_vec_def_for_stmt_copy (dts
[1], vec_oprnds1
[0]);
7143 if (op_type
== ternary_op
)
7145 if (single_defuse_cycle
&& reduc_index
== 2)
7146 vec_oprnds2
[0] = gimple_get_lhs (new_stmt_info
->stmt
);
7149 = vect_get_vec_def_for_stmt_copy (dts
[2], vec_oprnds2
[0]);
7154 FOR_EACH_VEC_ELT (vec_oprnds0
, i
, def0
)
7156 tree vop
[3] = { def0
, vec_oprnds1
[i
], NULL_TREE
};
7159 /* Make sure that the reduction accumulator is vop[0]. */
7160 if (reduc_index
== 1)
7162 gcc_assert (commutative_tree_code (code
));
7163 std::swap (vop
[0], vop
[1]);
7165 tree mask
= vect_get_loop_mask (gsi
, masks
, vec_num
* ncopies
,
7166 vectype_in
, i
* ncopies
+ j
);
7167 gcall
*call
= gimple_build_call_internal (cond_fn
, 4, mask
,
7170 new_temp
= make_ssa_name (vec_dest
, call
);
7171 gimple_call_set_lhs (call
, new_temp
);
7172 gimple_call_set_nothrow (call
, true);
7173 new_stmt_info
= vect_finish_stmt_generation (stmt
, call
, gsi
);
7177 if (op_type
== ternary_op
)
7178 vop
[2] = vec_oprnds2
[i
];
7180 gassign
*new_stmt
= gimple_build_assign (vec_dest
, code
,
7181 vop
[0], vop
[1], vop
[2]);
7182 new_temp
= make_ssa_name (vec_dest
, new_stmt
);
7183 gimple_assign_set_lhs (new_stmt
, new_temp
);
7185 = vect_finish_stmt_generation (stmt
, new_stmt
, gsi
);
7190 SLP_TREE_VEC_STMTS (slp_node
).quick_push (new_stmt_info
);
7191 vect_defs
.quick_push (new_temp
);
7194 vect_defs
[0] = new_temp
;
7201 STMT_VINFO_VEC_STMT (stmt_info
) = *vec_stmt
= new_stmt_info
;
7203 STMT_VINFO_RELATED_STMT (prev_stmt_info
) = new_stmt_info
;
7205 prev_stmt_info
= new_stmt_info
;
7208 /* Finalize the reduction-phi (set its arguments) and create the
7209 epilog reduction code. */
7210 if ((!single_defuse_cycle
|| code
== COND_EXPR
) && !slp_node
)
7211 vect_defs
[0] = gimple_get_lhs ((*vec_stmt
)->stmt
);
7213 vect_create_epilog_for_reduction (vect_defs
, stmt
, reduc_def_phi
,
7214 epilog_copies
, reduc_fn
, phis
,
7215 double_reduc
, slp_node
, slp_node_instance
,
7216 cond_reduc_val
, cond_reduc_op_code
,
7222 /* Function vect_min_worthwhile_factor.
7224 For a loop where we could vectorize the operation indicated by CODE,
7225 return the minimum vectorization factor that makes it worthwhile
7226 to use generic vectors. */
7228 vect_min_worthwhile_factor (enum tree_code code
)
7248 /* Return true if VINFO indicates we are doing loop vectorization and if
7249 it is worth decomposing CODE operations into scalar operations for
7250 that loop's vectorization factor. */
7253 vect_worthwhile_without_simd_p (vec_info
*vinfo
, tree_code code
)
7255 loop_vec_info loop_vinfo
= dyn_cast
<loop_vec_info
> (vinfo
);
7256 unsigned HOST_WIDE_INT value
;
7258 && LOOP_VINFO_VECT_FACTOR (loop_vinfo
).is_constant (&value
)
7259 && value
>= vect_min_worthwhile_factor (code
));
7262 /* Function vectorizable_induction
7264 Check if PHI performs an induction computation that can be vectorized.
7265 If VEC_STMT is also passed, vectorize the induction PHI: create a vectorized
7266 phi to replace it, put it in VEC_STMT, and add it to the same basic block.
7267 Return FALSE if not a vectorizable STMT, TRUE otherwise. */
7270 vectorizable_induction (gimple
*phi
,
7271 gimple_stmt_iterator
*gsi ATTRIBUTE_UNUSED
,
7272 stmt_vec_info
*vec_stmt
, slp_tree slp_node
,
7273 stmt_vector_for_cost
*cost_vec
)
7275 stmt_vec_info stmt_info
= vinfo_for_stmt (phi
);
7276 loop_vec_info loop_vinfo
= STMT_VINFO_LOOP_VINFO (stmt_info
);
7277 struct loop
*loop
= LOOP_VINFO_LOOP (loop_vinfo
);
7279 bool nested_in_vect_loop
= false;
7280 struct loop
*iv_loop
;
7282 edge pe
= loop_preheader_edge (loop
);
7284 tree new_vec
, vec_init
, vec_step
, t
;
7287 gphi
*induction_phi
;
7288 tree induc_def
, vec_dest
;
7289 tree init_expr
, step_expr
;
7290 poly_uint64 vf
= LOOP_VINFO_VECT_FACTOR (loop_vinfo
);
7294 imm_use_iterator imm_iter
;
7295 use_operand_p use_p
;
7299 gimple_stmt_iterator si
;
7300 basic_block bb
= gimple_bb (phi
);
7302 if (gimple_code (phi
) != GIMPLE_PHI
)
7305 if (!STMT_VINFO_RELEVANT_P (stmt_info
))
7308 /* Make sure it was recognized as induction computation. */
7309 if (STMT_VINFO_DEF_TYPE (stmt_info
) != vect_induction_def
)
7312 tree vectype
= STMT_VINFO_VECTYPE (stmt_info
);
7313 poly_uint64 nunits
= TYPE_VECTOR_SUBPARTS (vectype
);
7318 ncopies
= vect_get_num_copies (loop_vinfo
, vectype
);
7319 gcc_assert (ncopies
>= 1);
7321 /* FORNOW. These restrictions should be relaxed. */
7322 if (nested_in_vect_loop_p (loop
, phi
))
7324 imm_use_iterator imm_iter
;
7325 use_operand_p use_p
;
7332 if (dump_enabled_p ())
7333 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
7334 "multiple types in nested loop.\n");
7338 /* FORNOW: outer loop induction with SLP not supported. */
7339 if (STMT_SLP_TYPE (stmt_info
))
7343 latch_e
= loop_latch_edge (loop
->inner
);
7344 loop_arg
= PHI_ARG_DEF_FROM_EDGE (phi
, latch_e
);
7345 FOR_EACH_IMM_USE_FAST (use_p
, imm_iter
, loop_arg
)
7347 gimple
*use_stmt
= USE_STMT (use_p
);
7348 if (is_gimple_debug (use_stmt
))
7351 if (!flow_bb_inside_loop_p (loop
->inner
, gimple_bb (use_stmt
)))
7353 exit_phi
= use_stmt
;
7359 stmt_vec_info exit_phi_vinfo
= loop_vinfo
->lookup_stmt (exit_phi
);
7360 if (!(STMT_VINFO_RELEVANT_P (exit_phi_vinfo
)
7361 && !STMT_VINFO_LIVE_P (exit_phi_vinfo
)))
7363 if (dump_enabled_p ())
7364 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
7365 "inner-loop induction only used outside "
7366 "of the outer vectorized loop.\n");
7371 nested_in_vect_loop
= true;
7372 iv_loop
= loop
->inner
;
7376 gcc_assert (iv_loop
== (gimple_bb (phi
))->loop_father
);
7378 if (slp_node
&& !nunits
.is_constant ())
7380 /* The current SLP code creates the initial value element-by-element. */
7381 if (dump_enabled_p ())
7382 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
7383 "SLP induction not supported for variable-length"
7388 if (!vec_stmt
) /* transformation not required. */
7390 STMT_VINFO_TYPE (stmt_info
) = induc_vec_info_type
;
7391 DUMP_VECT_SCOPE ("vectorizable_induction");
7392 vect_model_induction_cost (stmt_info
, ncopies
, cost_vec
);
7398 /* Compute a vector variable, initialized with the first VF values of
7399 the induction variable. E.g., for an iv with IV_PHI='X' and
7400 evolution S, for a vector of 4 units, we want to compute:
7401 [X, X + S, X + 2*S, X + 3*S]. */
7403 if (dump_enabled_p ())
7404 dump_printf_loc (MSG_NOTE
, vect_location
, "transform induction phi.\n");
7406 latch_e
= loop_latch_edge (iv_loop
);
7407 loop_arg
= PHI_ARG_DEF_FROM_EDGE (phi
, latch_e
);
7409 step_expr
= STMT_VINFO_LOOP_PHI_EVOLUTION_PART (stmt_info
);
7410 gcc_assert (step_expr
!= NULL_TREE
);
7412 pe
= loop_preheader_edge (iv_loop
);
7413 init_expr
= PHI_ARG_DEF_FROM_EDGE (phi
,
7414 loop_preheader_edge (iv_loop
));
7417 if (!nested_in_vect_loop
)
7419 /* Convert the initial value to the desired type. */
7420 tree new_type
= TREE_TYPE (vectype
);
7421 init_expr
= gimple_convert (&stmts
, new_type
, init_expr
);
7423 /* If we are using the loop mask to "peel" for alignment then we need
7424 to adjust the start value here. */
7425 tree skip_niters
= LOOP_VINFO_MASK_SKIP_NITERS (loop_vinfo
);
7426 if (skip_niters
!= NULL_TREE
)
7428 if (FLOAT_TYPE_P (vectype
))
7429 skip_niters
= gimple_build (&stmts
, FLOAT_EXPR
, new_type
,
7432 skip_niters
= gimple_convert (&stmts
, new_type
, skip_niters
);
7433 tree skip_step
= gimple_build (&stmts
, MULT_EXPR
, new_type
,
7434 skip_niters
, step_expr
);
7435 init_expr
= gimple_build (&stmts
, MINUS_EXPR
, new_type
,
7436 init_expr
, skip_step
);
7440 /* Convert the step to the desired type. */
7441 step_expr
= gimple_convert (&stmts
, TREE_TYPE (vectype
), step_expr
);
7445 new_bb
= gsi_insert_seq_on_edge_immediate (pe
, stmts
);
7446 gcc_assert (!new_bb
);
7449 /* Find the first insertion point in the BB. */
7450 si
= gsi_after_labels (bb
);
7452 /* For SLP induction we have to generate several IVs as for example
7453 with group size 3 we need [i, i, i, i + S] [i + S, i + S, i + 2*S, i + 2*S]
7454 [i + 2*S, i + 3*S, i + 3*S, i + 3*S]. The step is the same uniform
7455 [VF*S, VF*S, VF*S, VF*S] for all. */
7458 /* Enforced above. */
7459 unsigned int const_nunits
= nunits
.to_constant ();
7461 /* Generate [VF*S, VF*S, ... ]. */
7462 if (SCALAR_FLOAT_TYPE_P (TREE_TYPE (step_expr
)))
7464 expr
= build_int_cst (integer_type_node
, vf
);
7465 expr
= fold_convert (TREE_TYPE (step_expr
), expr
);
7468 expr
= build_int_cst (TREE_TYPE (step_expr
), vf
);
7469 new_name
= fold_build2 (MULT_EXPR
, TREE_TYPE (step_expr
),
7471 if (! CONSTANT_CLASS_P (new_name
))
7472 new_name
= vect_init_vector (phi
, new_name
,
7473 TREE_TYPE (step_expr
), NULL
);
7474 new_vec
= build_vector_from_val (vectype
, new_name
);
7475 vec_step
= vect_init_vector (phi
, new_vec
, vectype
, NULL
);
7477 /* Now generate the IVs. */
7478 unsigned group_size
= SLP_TREE_SCALAR_STMTS (slp_node
).length ();
7479 unsigned nvects
= SLP_TREE_NUMBER_OF_VEC_STMTS (slp_node
);
7480 unsigned elts
= const_nunits
* nvects
;
7481 unsigned nivs
= least_common_multiple (group_size
,
7482 const_nunits
) / const_nunits
;
7483 gcc_assert (elts
% group_size
== 0);
7484 tree elt
= init_expr
;
7486 for (ivn
= 0; ivn
< nivs
; ++ivn
)
7488 tree_vector_builder
elts (vectype
, const_nunits
, 1);
7490 for (unsigned eltn
= 0; eltn
< const_nunits
; ++eltn
)
7492 if (ivn
*const_nunits
+ eltn
>= group_size
7493 && (ivn
* const_nunits
+ eltn
) % group_size
== 0)
7494 elt
= gimple_build (&stmts
, PLUS_EXPR
, TREE_TYPE (elt
),
7496 elts
.quick_push (elt
);
7498 vec_init
= gimple_build_vector (&stmts
, &elts
);
7501 new_bb
= gsi_insert_seq_on_edge_immediate (pe
, stmts
);
7502 gcc_assert (!new_bb
);
7505 /* Create the induction-phi that defines the induction-operand. */
7506 vec_dest
= vect_get_new_vect_var (vectype
, vect_simple_var
, "vec_iv_");
7507 induction_phi
= create_phi_node (vec_dest
, iv_loop
->header
);
7508 stmt_vec_info induction_phi_info
7509 = loop_vinfo
->add_stmt (induction_phi
);
7510 induc_def
= PHI_RESULT (induction_phi
);
7512 /* Create the iv update inside the loop */
7513 vec_def
= make_ssa_name (vec_dest
);
7514 new_stmt
= gimple_build_assign (vec_def
, PLUS_EXPR
, induc_def
, vec_step
);
7515 gsi_insert_before (&si
, new_stmt
, GSI_SAME_STMT
);
7516 loop_vinfo
->add_stmt (new_stmt
);
7518 /* Set the arguments of the phi node: */
7519 add_phi_arg (induction_phi
, vec_init
, pe
, UNKNOWN_LOCATION
);
7520 add_phi_arg (induction_phi
, vec_def
, loop_latch_edge (iv_loop
),
7523 SLP_TREE_VEC_STMTS (slp_node
).quick_push (induction_phi_info
);
7526 /* Re-use IVs when we can. */
7530 = least_common_multiple (group_size
, const_nunits
) / group_size
;
7531 /* Generate [VF'*S, VF'*S, ... ]. */
7532 if (SCALAR_FLOAT_TYPE_P (TREE_TYPE (step_expr
)))
7534 expr
= build_int_cst (integer_type_node
, vfp
);
7535 expr
= fold_convert (TREE_TYPE (step_expr
), expr
);
7538 expr
= build_int_cst (TREE_TYPE (step_expr
), vfp
);
7539 new_name
= fold_build2 (MULT_EXPR
, TREE_TYPE (step_expr
),
7541 if (! CONSTANT_CLASS_P (new_name
))
7542 new_name
= vect_init_vector (phi
, new_name
,
7543 TREE_TYPE (step_expr
), NULL
);
7544 new_vec
= build_vector_from_val (vectype
, new_name
);
7545 vec_step
= vect_init_vector (phi
, new_vec
, vectype
, NULL
);
7546 for (; ivn
< nvects
; ++ivn
)
7548 gimple
*iv
= SLP_TREE_VEC_STMTS (slp_node
)[ivn
- nivs
]->stmt
;
7550 if (gimple_code (iv
) == GIMPLE_PHI
)
7551 def
= gimple_phi_result (iv
);
7553 def
= gimple_assign_lhs (iv
);
7554 new_stmt
= gimple_build_assign (make_ssa_name (vectype
),
7557 if (gimple_code (iv
) == GIMPLE_PHI
)
7558 gsi_insert_before (&si
, new_stmt
, GSI_SAME_STMT
);
7561 gimple_stmt_iterator tgsi
= gsi_for_stmt (iv
);
7562 gsi_insert_after (&tgsi
, new_stmt
, GSI_CONTINUE_LINKING
);
7564 SLP_TREE_VEC_STMTS (slp_node
).quick_push
7565 (loop_vinfo
->add_stmt (new_stmt
));
7572 /* Create the vector that holds the initial_value of the induction. */
7573 if (nested_in_vect_loop
)
7575 /* iv_loop is nested in the loop to be vectorized. init_expr had already
7576 been created during vectorization of previous stmts. We obtain it
7577 from the STMT_VINFO_VEC_STMT of the defining stmt. */
7578 vec_init
= vect_get_vec_def_for_operand (init_expr
, phi
);
7579 /* If the initial value is not of proper type, convert it. */
7580 if (!useless_type_conversion_p (vectype
, TREE_TYPE (vec_init
)))
7583 = gimple_build_assign (vect_get_new_ssa_name (vectype
,
7587 build1 (VIEW_CONVERT_EXPR
, vectype
,
7589 vec_init
= gimple_assign_lhs (new_stmt
);
7590 new_bb
= gsi_insert_on_edge_immediate (loop_preheader_edge (iv_loop
),
7592 gcc_assert (!new_bb
);
7593 loop_vinfo
->add_stmt (new_stmt
);
7598 /* iv_loop is the loop to be vectorized. Create:
7599 vec_init = [X, X+S, X+2*S, X+3*S] (S = step_expr, X = init_expr) */
7601 new_name
= gimple_convert (&stmts
, TREE_TYPE (vectype
), init_expr
);
7603 unsigned HOST_WIDE_INT const_nunits
;
7604 if (nunits
.is_constant (&const_nunits
))
7606 tree_vector_builder
elts (vectype
, const_nunits
, 1);
7607 elts
.quick_push (new_name
);
7608 for (i
= 1; i
< const_nunits
; i
++)
7610 /* Create: new_name_i = new_name + step_expr */
7611 new_name
= gimple_build (&stmts
, PLUS_EXPR
, TREE_TYPE (new_name
),
7612 new_name
, step_expr
);
7613 elts
.quick_push (new_name
);
7615 /* Create a vector from [new_name_0, new_name_1, ...,
7616 new_name_nunits-1] */
7617 vec_init
= gimple_build_vector (&stmts
, &elts
);
7619 else if (INTEGRAL_TYPE_P (TREE_TYPE (step_expr
)))
7620 /* Build the initial value directly from a VEC_SERIES_EXPR. */
7621 vec_init
= gimple_build (&stmts
, VEC_SERIES_EXPR
, vectype
,
7622 new_name
, step_expr
);
7626 [base, base, base, ...]
7627 + (vectype) [0, 1, 2, ...] * [step, step, step, ...]. */
7628 gcc_assert (SCALAR_FLOAT_TYPE_P (TREE_TYPE (step_expr
)));
7629 gcc_assert (flag_associative_math
);
7630 tree index
= build_index_vector (vectype
, 0, 1);
7631 tree base_vec
= gimple_build_vector_from_val (&stmts
, vectype
,
7633 tree step_vec
= gimple_build_vector_from_val (&stmts
, vectype
,
7635 vec_init
= gimple_build (&stmts
, FLOAT_EXPR
, vectype
, index
);
7636 vec_init
= gimple_build (&stmts
, MULT_EXPR
, vectype
,
7637 vec_init
, step_vec
);
7638 vec_init
= gimple_build (&stmts
, PLUS_EXPR
, vectype
,
7639 vec_init
, base_vec
);
7644 new_bb
= gsi_insert_seq_on_edge_immediate (pe
, stmts
);
7645 gcc_assert (!new_bb
);
7650 /* Create the vector that holds the step of the induction. */
7651 if (nested_in_vect_loop
)
7652 /* iv_loop is nested in the loop to be vectorized. Generate:
7653 vec_step = [S, S, S, S] */
7654 new_name
= step_expr
;
7657 /* iv_loop is the loop to be vectorized. Generate:
7658 vec_step = [VF*S, VF*S, VF*S, VF*S] */
7659 gimple_seq seq
= NULL
;
7660 if (SCALAR_FLOAT_TYPE_P (TREE_TYPE (step_expr
)))
7662 expr
= build_int_cst (integer_type_node
, vf
);
7663 expr
= gimple_build (&seq
, FLOAT_EXPR
, TREE_TYPE (step_expr
), expr
);
7666 expr
= build_int_cst (TREE_TYPE (step_expr
), vf
);
7667 new_name
= gimple_build (&seq
, MULT_EXPR
, TREE_TYPE (step_expr
),
7671 new_bb
= gsi_insert_seq_on_edge_immediate (pe
, seq
);
7672 gcc_assert (!new_bb
);
7676 t
= unshare_expr (new_name
);
7677 gcc_assert (CONSTANT_CLASS_P (new_name
)
7678 || TREE_CODE (new_name
) == SSA_NAME
);
7679 new_vec
= build_vector_from_val (vectype
, t
);
7680 vec_step
= vect_init_vector (phi
, new_vec
, vectype
, NULL
);
7683 /* Create the following def-use cycle:
7688 vec_iv = PHI <vec_init, vec_loop>
7692 vec_loop = vec_iv + vec_step; */
7694 /* Create the induction-phi that defines the induction-operand. */
7695 vec_dest
= vect_get_new_vect_var (vectype
, vect_simple_var
, "vec_iv_");
7696 induction_phi
= create_phi_node (vec_dest
, iv_loop
->header
);
7697 stmt_vec_info induction_phi_info
= loop_vinfo
->add_stmt (induction_phi
);
7698 induc_def
= PHI_RESULT (induction_phi
);
7700 /* Create the iv update inside the loop */
7701 vec_def
= make_ssa_name (vec_dest
);
7702 new_stmt
= gimple_build_assign (vec_def
, PLUS_EXPR
, induc_def
, vec_step
);
7703 gsi_insert_before (&si
, new_stmt
, GSI_SAME_STMT
);
7704 stmt_vec_info new_stmt_info
= loop_vinfo
->add_stmt (new_stmt
);
7706 /* Set the arguments of the phi node: */
7707 add_phi_arg (induction_phi
, vec_init
, pe
, UNKNOWN_LOCATION
);
7708 add_phi_arg (induction_phi
, vec_def
, loop_latch_edge (iv_loop
),
7711 STMT_VINFO_VEC_STMT (stmt_info
) = *vec_stmt
= induction_phi_info
;
7713 /* In case that vectorization factor (VF) is bigger than the number
7714 of elements that we can fit in a vectype (nunits), we have to generate
7715 more than one vector stmt - i.e - we need to "unroll" the
7716 vector stmt by a factor VF/nunits. For more details see documentation
7717 in vectorizable_operation. */
7721 gimple_seq seq
= NULL
;
7722 stmt_vec_info prev_stmt_vinfo
;
7723 /* FORNOW. This restriction should be relaxed. */
7724 gcc_assert (!nested_in_vect_loop
);
7726 /* Create the vector that holds the step of the induction. */
7727 if (SCALAR_FLOAT_TYPE_P (TREE_TYPE (step_expr
)))
7729 expr
= build_int_cst (integer_type_node
, nunits
);
7730 expr
= gimple_build (&seq
, FLOAT_EXPR
, TREE_TYPE (step_expr
), expr
);
7733 expr
= build_int_cst (TREE_TYPE (step_expr
), nunits
);
7734 new_name
= gimple_build (&seq
, MULT_EXPR
, TREE_TYPE (step_expr
),
7738 new_bb
= gsi_insert_seq_on_edge_immediate (pe
, seq
);
7739 gcc_assert (!new_bb
);
7742 t
= unshare_expr (new_name
);
7743 gcc_assert (CONSTANT_CLASS_P (new_name
)
7744 || TREE_CODE (new_name
) == SSA_NAME
);
7745 new_vec
= build_vector_from_val (vectype
, t
);
7746 vec_step
= vect_init_vector (phi
, new_vec
, vectype
, NULL
);
7748 vec_def
= induc_def
;
7749 prev_stmt_vinfo
= induction_phi_info
;
7750 for (i
= 1; i
< ncopies
; i
++)
7752 /* vec_i = vec_prev + vec_step */
7753 new_stmt
= gimple_build_assign (vec_dest
, PLUS_EXPR
,
7755 vec_def
= make_ssa_name (vec_dest
, new_stmt
);
7756 gimple_assign_set_lhs (new_stmt
, vec_def
);
7758 gsi_insert_before (&si
, new_stmt
, GSI_SAME_STMT
);
7759 new_stmt_info
= loop_vinfo
->add_stmt (new_stmt
);
7760 STMT_VINFO_RELATED_STMT (prev_stmt_vinfo
) = new_stmt_info
;
7761 prev_stmt_vinfo
= new_stmt_info
;
7765 if (nested_in_vect_loop
)
7767 /* Find the loop-closed exit-phi of the induction, and record
7768 the final vector of induction results: */
7770 FOR_EACH_IMM_USE_FAST (use_p
, imm_iter
, loop_arg
)
7772 gimple
*use_stmt
= USE_STMT (use_p
);
7773 if (is_gimple_debug (use_stmt
))
7776 if (!flow_bb_inside_loop_p (iv_loop
, gimple_bb (use_stmt
)))
7778 exit_phi
= use_stmt
;
7784 stmt_vec_info stmt_vinfo
= loop_vinfo
->lookup_stmt (exit_phi
);
7785 /* FORNOW. Currently not supporting the case that an inner-loop induction
7786 is not used in the outer-loop (i.e. only outside the outer-loop). */
7787 gcc_assert (STMT_VINFO_RELEVANT_P (stmt_vinfo
)
7788 && !STMT_VINFO_LIVE_P (stmt_vinfo
));
7790 STMT_VINFO_VEC_STMT (stmt_vinfo
) = new_stmt_info
;
7791 if (dump_enabled_p ())
7793 dump_printf_loc (MSG_NOTE
, vect_location
,
7794 "vector of inductions after inner-loop:");
7795 dump_gimple_stmt (MSG_NOTE
, TDF_SLIM
, new_stmt
, 0);
7801 if (dump_enabled_p ())
7803 dump_printf_loc (MSG_NOTE
, vect_location
,
7804 "transform induction: created def-use cycle: ");
7805 dump_gimple_stmt (MSG_NOTE
, TDF_SLIM
, induction_phi
, 0);
7806 dump_gimple_stmt (MSG_NOTE
, TDF_SLIM
,
7807 SSA_NAME_DEF_STMT (vec_def
), 0);
7813 /* Function vectorizable_live_operation.
7815 STMT computes a value that is used outside the loop. Check if
7816 it can be supported. */
7819 vectorizable_live_operation (gimple
*stmt
,
7820 gimple_stmt_iterator
*gsi ATTRIBUTE_UNUSED
,
7821 slp_tree slp_node
, int slp_index
,
7822 stmt_vec_info
*vec_stmt
,
7823 stmt_vector_for_cost
*)
7825 stmt_vec_info stmt_info
= vinfo_for_stmt (stmt
);
7826 loop_vec_info loop_vinfo
= STMT_VINFO_LOOP_VINFO (stmt_info
);
7827 struct loop
*loop
= LOOP_VINFO_LOOP (loop_vinfo
);
7828 imm_use_iterator imm_iter
;
7829 tree lhs
, lhs_type
, bitsize
, vec_bitsize
;
7830 tree vectype
= STMT_VINFO_VECTYPE (stmt_info
);
7831 poly_uint64 nunits
= TYPE_VECTOR_SUBPARTS (vectype
);
7834 auto_vec
<tree
> vec_oprnds
;
7836 poly_uint64 vec_index
= 0;
7838 gcc_assert (STMT_VINFO_LIVE_P (stmt_info
));
7840 if (STMT_VINFO_DEF_TYPE (stmt_info
) == vect_reduction_def
)
7843 /* FORNOW. CHECKME. */
7844 if (nested_in_vect_loop_p (loop
, stmt
))
7847 /* If STMT is not relevant and it is a simple assignment and its inputs are
7848 invariant then it can remain in place, unvectorized. The original last
7849 scalar value that it computes will be used. */
7850 if (!STMT_VINFO_RELEVANT_P (stmt_info
))
7852 gcc_assert (is_simple_and_all_uses_invariant (stmt
, loop_vinfo
));
7853 if (dump_enabled_p ())
7854 dump_printf_loc (MSG_NOTE
, vect_location
,
7855 "statement is simple and uses invariant. Leaving in "
7863 ncopies
= vect_get_num_copies (loop_vinfo
, vectype
);
7867 gcc_assert (slp_index
>= 0);
7869 int num_scalar
= SLP_TREE_SCALAR_STMTS (slp_node
).length ();
7870 int num_vec
= SLP_TREE_NUMBER_OF_VEC_STMTS (slp_node
);
7872 /* Get the last occurrence of the scalar index from the concatenation of
7873 all the slp vectors. Calculate which slp vector it is and the index
7875 poly_uint64 pos
= (num_vec
* nunits
) - num_scalar
+ slp_index
;
7877 /* Calculate which vector contains the result, and which lane of
7878 that vector we need. */
7879 if (!can_div_trunc_p (pos
, nunits
, &vec_entry
, &vec_index
))
7881 if (dump_enabled_p ())
7882 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
7883 "Cannot determine which vector holds the"
7884 " final result.\n");
7891 /* No transformation required. */
7892 if (LOOP_VINFO_CAN_FULLY_MASK_P (loop_vinfo
))
7894 if (!direct_internal_fn_supported_p (IFN_EXTRACT_LAST
, vectype
,
7895 OPTIMIZE_FOR_SPEED
))
7897 if (dump_enabled_p ())
7898 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
7899 "can't use a fully-masked loop because "
7900 "the target doesn't support extract last "
7902 LOOP_VINFO_CAN_FULLY_MASK_P (loop_vinfo
) = false;
7906 if (dump_enabled_p ())
7907 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
7908 "can't use a fully-masked loop because an "
7909 "SLP statement is live after the loop.\n");
7910 LOOP_VINFO_CAN_FULLY_MASK_P (loop_vinfo
) = false;
7912 else if (ncopies
> 1)
7914 if (dump_enabled_p ())
7915 dump_printf_loc (MSG_MISSED_OPTIMIZATION
, vect_location
,
7916 "can't use a fully-masked loop because"
7917 " ncopies is greater than 1.\n");
7918 LOOP_VINFO_CAN_FULLY_MASK_P (loop_vinfo
) = false;
7922 gcc_assert (ncopies
== 1 && !slp_node
);
7923 vect_record_loop_mask (loop_vinfo
,
7924 &LOOP_VINFO_MASKS (loop_vinfo
),
7931 /* If stmt has a related stmt, then use that for getting the lhs. */
7932 if (is_pattern_stmt_p (stmt_info
))
7933 stmt
= STMT_VINFO_RELATED_STMT (stmt_info
);
7935 lhs
= (is_a
<gphi
*> (stmt
)) ? gimple_phi_result (stmt
)
7936 : gimple_get_lhs (stmt
);
7937 lhs_type
= TREE_TYPE (lhs
);
7939 bitsize
= (VECTOR_BOOLEAN_TYPE_P (vectype
)
7940 ? bitsize_int (TYPE_PRECISION (TREE_TYPE (vectype
)))
7941 : TYPE_SIZE (TREE_TYPE (vectype
)));
7942 vec_bitsize
= TYPE_SIZE (vectype
);
7944 /* Get the vectorized lhs of STMT and the lane to use (counted in bits). */
7945 tree vec_lhs
, bitstart
;
7948 gcc_assert (!LOOP_VINFO_FULLY_MASKED_P (loop_vinfo
));
7950 /* Get the correct slp vectorized stmt. */
7951 gimple
*vec_stmt
= SLP_TREE_VEC_STMTS (slp_node
)[vec_entry
]->stmt
;
7952 if (gphi
*phi
= dyn_cast
<gphi
*> (vec_stmt
))
7953 vec_lhs
= gimple_phi_result (phi
);
7955 vec_lhs
= gimple_get_lhs (vec_stmt
);
7957 /* Get entry to use. */
7958 bitstart
= bitsize_int (vec_index
);
7959 bitstart
= int_const_binop (MULT_EXPR
, bitsize
, bitstart
);
7963 enum vect_def_type dt
= STMT_VINFO_DEF_TYPE (stmt_info
);
7964 vec_lhs
= vect_get_vec_def_for_operand_1 (stmt_info
, dt
);
7965 gcc_checking_assert (ncopies
== 1
7966 || !LOOP_VINFO_FULLY_MASKED_P (loop_vinfo
));
7968 /* For multiple copies, get the last copy. */
7969 for (int i
= 1; i
< ncopies
; ++i
)
7970 vec_lhs
= vect_get_vec_def_for_stmt_copy (vect_unknown_def_type
,
7973 /* Get the last lane in the vector. */
7974 bitstart
= int_const_binop (MINUS_EXPR
, vec_bitsize
, bitsize
);
7977 gimple_seq stmts
= NULL
;
7979 if (LOOP_VINFO_FULLY_MASKED_P (loop_vinfo
))
7983 SCALAR_RES = EXTRACT_LAST <VEC_LHS, MASK>
7985 where VEC_LHS is the vectorized live-out result and MASK is
7986 the loop mask for the final iteration. */
7987 gcc_assert (ncopies
== 1 && !slp_node
);
7988 tree scalar_type
= TREE_TYPE (STMT_VINFO_VECTYPE (stmt_info
));
7989 tree mask
= vect_get_loop_mask (gsi
, &LOOP_VINFO_MASKS (loop_vinfo
),
7991 tree scalar_res
= gimple_build (&stmts
, CFN_EXTRACT_LAST
,
7992 scalar_type
, mask
, vec_lhs
);
7994 /* Convert the extracted vector element to the required scalar type. */
7995 new_tree
= gimple_convert (&stmts
, lhs_type
, scalar_res
);
7999 tree bftype
= TREE_TYPE (vectype
);
8000 if (VECTOR_BOOLEAN_TYPE_P (vectype
))
8001 bftype
= build_nonstandard_integer_type (tree_to_uhwi (bitsize
), 1);
8002 new_tree
= build3 (BIT_FIELD_REF
, bftype
, vec_lhs
, bitsize
, bitstart
);
8003 new_tree
= force_gimple_operand (fold_convert (lhs_type
, new_tree
),
8004 &stmts
, true, NULL_TREE
);
8008 gsi_insert_seq_on_edge_immediate (single_exit (loop
), stmts
);
8010 /* Replace use of lhs with newly computed result. If the use stmt is a
8011 single arg PHI, just replace all uses of PHI result. It's necessary
8012 because lcssa PHI defining lhs may be before newly inserted stmt. */
8013 use_operand_p use_p
;
8014 FOR_EACH_IMM_USE_STMT (use_stmt
, imm_iter
, lhs
)
8015 if (!flow_bb_inside_loop_p (loop
, gimple_bb (use_stmt
))
8016 && !is_gimple_debug (use_stmt
))
8018 if (gimple_code (use_stmt
) == GIMPLE_PHI
8019 && gimple_phi_num_args (use_stmt
) == 1)
8021 replace_uses_by (gimple_phi_result (use_stmt
), new_tree
);
8025 FOR_EACH_IMM_USE_ON_STMT (use_p
, imm_iter
)
8026 SET_USE (use_p
, new_tree
);
8028 update_stmt (use_stmt
);
8034 /* Kill any debug uses outside LOOP of SSA names defined in STMT. */
8037 vect_loop_kill_debug_uses (struct loop
*loop
, gimple
*stmt
)
8039 ssa_op_iter op_iter
;
8040 imm_use_iterator imm_iter
;
8041 def_operand_p def_p
;
8044 FOR_EACH_PHI_OR_STMT_DEF (def_p
, stmt
, op_iter
, SSA_OP_DEF
)
8046 FOR_EACH_IMM_USE_STMT (ustmt
, imm_iter
, DEF_FROM_PTR (def_p
))
8050 if (!is_gimple_debug (ustmt
))
8053 bb
= gimple_bb (ustmt
);
8055 if (!flow_bb_inside_loop_p (loop
, bb
))
8057 if (gimple_debug_bind_p (ustmt
))
8059 if (dump_enabled_p ())
8060 dump_printf_loc (MSG_NOTE
, vect_location
,
8061 "killing debug use\n");
8063 gimple_debug_bind_reset_value (ustmt
);
8064 update_stmt (ustmt
);
8073 /* Given loop represented by LOOP_VINFO, return true if computation of
8074 LOOP_VINFO_NITERS (= LOOP_VINFO_NITERSM1 + 1) doesn't overflow, false
8078 loop_niters_no_overflow (loop_vec_info loop_vinfo
)
8080 /* Constant case. */
8081 if (LOOP_VINFO_NITERS_KNOWN_P (loop_vinfo
))
8083 tree cst_niters
= LOOP_VINFO_NITERS (loop_vinfo
);
8084 tree cst_nitersm1
= LOOP_VINFO_NITERSM1 (loop_vinfo
);
8086 gcc_assert (TREE_CODE (cst_niters
) == INTEGER_CST
);
8087 gcc_assert (TREE_CODE (cst_nitersm1
) == INTEGER_CST
);
8088 if (wi::to_widest (cst_nitersm1
) < wi::to_widest (cst_niters
))
8093 struct loop
*loop
= LOOP_VINFO_LOOP (loop_vinfo
);
8094 /* Check the upper bound of loop niters. */
8095 if (get_max_loop_iterations (loop
, &max
))
8097 tree type
= TREE_TYPE (LOOP_VINFO_NITERS (loop_vinfo
));
8098 signop sgn
= TYPE_SIGN (type
);
8099 widest_int type_max
= widest_int::from (wi::max_value (type
), sgn
);
8106 /* Return a mask type with half the number of elements as TYPE. */
8109 vect_halve_mask_nunits (tree type
)
8111 poly_uint64 nunits
= exact_div (TYPE_VECTOR_SUBPARTS (type
), 2);
8112 return build_truth_vector_type (nunits
, current_vector_size
);
8115 /* Return a mask type with twice as many elements as TYPE. */
8118 vect_double_mask_nunits (tree type
)
8120 poly_uint64 nunits
= TYPE_VECTOR_SUBPARTS (type
) * 2;
8121 return build_truth_vector_type (nunits
, current_vector_size
);
8124 /* Record that a fully-masked version of LOOP_VINFO would need MASKS to
8125 contain a sequence of NVECTORS masks that each control a vector of type
8129 vect_record_loop_mask (loop_vec_info loop_vinfo
, vec_loop_masks
*masks
,
8130 unsigned int nvectors
, tree vectype
)
8132 gcc_assert (nvectors
!= 0);
8133 if (masks
->length () < nvectors
)
8134 masks
->safe_grow_cleared (nvectors
);
8135 rgroup_masks
*rgm
= &(*masks
)[nvectors
- 1];
8136 /* The number of scalars per iteration and the number of vectors are
8137 both compile-time constants. */
8138 unsigned int nscalars_per_iter
8139 = exact_div (nvectors
* TYPE_VECTOR_SUBPARTS (vectype
),
8140 LOOP_VINFO_VECT_FACTOR (loop_vinfo
)).to_constant ();
8141 if (rgm
->max_nscalars_per_iter
< nscalars_per_iter
)
8143 rgm
->max_nscalars_per_iter
= nscalars_per_iter
;
8144 rgm
->mask_type
= build_same_sized_truth_vector_type (vectype
);
8148 /* Given a complete set of masks MASKS, extract mask number INDEX
8149 for an rgroup that operates on NVECTORS vectors of type VECTYPE,
8150 where 0 <= INDEX < NVECTORS. Insert any set-up statements before GSI.
8152 See the comment above vec_loop_masks for more details about the mask
8156 vect_get_loop_mask (gimple_stmt_iterator
*gsi
, vec_loop_masks
*masks
,
8157 unsigned int nvectors
, tree vectype
, unsigned int index
)
8159 rgroup_masks
*rgm
= &(*masks
)[nvectors
- 1];
8160 tree mask_type
= rgm
->mask_type
;
8162 /* Populate the rgroup's mask array, if this is the first time we've
8164 if (rgm
->masks
.is_empty ())
8166 rgm
->masks
.safe_grow_cleared (nvectors
);
8167 for (unsigned int i
= 0; i
< nvectors
; ++i
)
8169 tree mask
= make_temp_ssa_name (mask_type
, NULL
, "loop_mask");
8170 /* Provide a dummy definition until the real one is available. */
8171 SSA_NAME_DEF_STMT (mask
) = gimple_build_nop ();
8172 rgm
->masks
[i
] = mask
;
8176 tree mask
= rgm
->masks
[index
];
8177 if (maybe_ne (TYPE_VECTOR_SUBPARTS (mask_type
),
8178 TYPE_VECTOR_SUBPARTS (vectype
)))
8180 /* A loop mask for data type X can be reused for data type Y
8181 if X has N times more elements than Y and if Y's elements
8182 are N times bigger than X's. In this case each sequence
8183 of N elements in the loop mask will be all-zero or all-one.
8184 We can then view-convert the mask so that each sequence of
8185 N elements is replaced by a single element. */
8186 gcc_assert (multiple_p (TYPE_VECTOR_SUBPARTS (mask_type
),
8187 TYPE_VECTOR_SUBPARTS (vectype
)));
8188 gimple_seq seq
= NULL
;
8189 mask_type
= build_same_sized_truth_vector_type (vectype
);
8190 mask
= gimple_build (&seq
, VIEW_CONVERT_EXPR
, mask_type
, mask
);
8192 gsi_insert_seq_before (gsi
, seq
, GSI_SAME_STMT
);
8197 /* Scale profiling counters by estimation for LOOP which is vectorized
8201 scale_profile_for_vect_loop (struct loop
*loop
, unsigned vf
)
8203 edge preheader
= loop_preheader_edge (loop
);
8204 /* Reduce loop iterations by the vectorization factor. */
8205 gcov_type new_est_niter
= niter_for_unrolled_loop (loop
, vf
);
8206 profile_count freq_h
= loop
->header
->count
, freq_e
= preheader
->count ();
8208 if (freq_h
.nonzero_p ())
8210 profile_probability p
;
8212 /* Avoid dropping loop body profile counter to 0 because of zero count
8213 in loop's preheader. */
8214 if (!(freq_e
== profile_count::zero ()))
8215 freq_e
= freq_e
.force_nonzero ();
8216 p
= freq_e
.apply_scale (new_est_niter
+ 1, 1).probability_in (freq_h
);
8217 scale_loop_frequencies (loop
, p
);
8220 edge exit_e
= single_exit (loop
);
8221 exit_e
->probability
= profile_probability::always ()
8222 .apply_scale (1, new_est_niter
+ 1);
8224 edge exit_l
= single_pred_edge (loop
->latch
);
8225 profile_probability prob
= exit_l
->probability
;
8226 exit_l
->probability
= exit_e
->probability
.invert ();
8227 if (prob
.initialized_p () && exit_l
->probability
.initialized_p ())
8228 scale_bbs_frequencies (&loop
->latch
, 1, exit_l
->probability
/ prob
);
8231 /* Vectorize STMT if relevant, inserting any new instructions before GSI.
8232 When vectorizing STMT as a store, set *SEEN_STORE to its stmt_vec_info.
8233 *SLP_SCHEDULE is a running record of whether we have called
8234 vect_schedule_slp. */
8237 vect_transform_loop_stmt (loop_vec_info loop_vinfo
, gimple
*stmt
,
8238 gimple_stmt_iterator
*gsi
,
8239 stmt_vec_info
*seen_store
, bool *slp_scheduled
)
8241 struct loop
*loop
= LOOP_VINFO_LOOP (loop_vinfo
);
8242 poly_uint64 vf
= LOOP_VINFO_VECT_FACTOR (loop_vinfo
);
8243 stmt_vec_info stmt_info
= loop_vinfo
->lookup_stmt (stmt
);
8247 if (dump_enabled_p ())
8249 dump_printf_loc (MSG_NOTE
, vect_location
,
8250 "------>vectorizing statement: ");
8251 dump_gimple_stmt (MSG_NOTE
, TDF_SLIM
, stmt
, 0);
8254 if (MAY_HAVE_DEBUG_BIND_STMTS
&& !STMT_VINFO_LIVE_P (stmt_info
))
8255 vect_loop_kill_debug_uses (loop
, stmt
);
8257 if (!STMT_VINFO_RELEVANT_P (stmt_info
)
8258 && !STMT_VINFO_LIVE_P (stmt_info
))
8261 if (STMT_VINFO_VECTYPE (stmt_info
))
8264 = TYPE_VECTOR_SUBPARTS (STMT_VINFO_VECTYPE (stmt_info
));
8265 if (!STMT_SLP_TYPE (stmt_info
)
8266 && maybe_ne (nunits
, vf
)
8267 && dump_enabled_p ())
8268 /* For SLP VF is set according to unrolling factor, and not
8269 to vector size, hence for SLP this print is not valid. */
8270 dump_printf_loc (MSG_NOTE
, vect_location
, "multiple-types.\n");
8273 /* SLP. Schedule all the SLP instances when the first SLP stmt is
8275 if (slp_vect_type slptype
= STMT_SLP_TYPE (stmt_info
))
8278 if (!*slp_scheduled
)
8280 *slp_scheduled
= true;
8282 DUMP_VECT_SCOPE ("scheduling SLP instances");
8284 vect_schedule_slp (loop_vinfo
);
8287 /* Hybrid SLP stmts must be vectorized in addition to SLP. */
8288 if (slptype
== pure_slp
)
8292 if (dump_enabled_p ())
8293 dump_printf_loc (MSG_NOTE
, vect_location
, "transform statement.\n");
8295 bool grouped_store
= false;
8296 if (vect_transform_stmt (stmt
, gsi
, &grouped_store
, NULL
, NULL
))
8297 *seen_store
= stmt_info
;
8300 /* Function vect_transform_loop.
8302 The analysis phase has determined that the loop is vectorizable.
8303 Vectorize the loop - created vectorized stmts to replace the scalar
8304 stmts in the loop, and update the loop exit condition.
8305 Returns scalar epilogue loop if any. */
8308 vect_transform_loop (loop_vec_info loop_vinfo
)
8310 struct loop
*loop
= LOOP_VINFO_LOOP (loop_vinfo
);
8311 struct loop
*epilogue
= NULL
;
8312 basic_block
*bbs
= LOOP_VINFO_BBS (loop_vinfo
);
8313 int nbbs
= loop
->num_nodes
;
8315 tree niters_vector
= NULL_TREE
;
8316 tree step_vector
= NULL_TREE
;
8317 tree niters_vector_mult_vf
= NULL_TREE
;
8318 poly_uint64 vf
= LOOP_VINFO_VECT_FACTOR (loop_vinfo
);
8319 unsigned int lowest_vf
= constant_lower_bound (vf
);
8320 bool slp_scheduled
= false;
8322 bool check_profitability
= false;
8325 DUMP_VECT_SCOPE ("vec_transform_loop");
8327 loop_vinfo
->shared
->check_datarefs ();
8329 /* Use the more conservative vectorization threshold. If the number
8330 of iterations is constant assume the cost check has been performed
8331 by our caller. If the threshold makes all loops profitable that
8332 run at least the (estimated) vectorization factor number of times
8333 checking is pointless, too. */
8334 th
= LOOP_VINFO_COST_MODEL_THRESHOLD (loop_vinfo
);
8335 if (th
>= vect_vf_for_cost (loop_vinfo
)
8336 && !LOOP_VINFO_NITERS_KNOWN_P (loop_vinfo
))
8338 if (dump_enabled_p ())
8339 dump_printf_loc (MSG_NOTE
, vect_location
,
8340 "Profitability threshold is %d loop iterations.\n",
8342 check_profitability
= true;
8345 /* Make sure there exists a single-predecessor exit bb. Do this before
8347 edge e
= single_exit (loop
);
8348 if (! single_pred_p (e
->dest
))
8350 split_loop_exit_edge (e
);
8351 if (dump_enabled_p ())
8352 dump_printf (MSG_NOTE
, "split exit edge\n");
8355 /* Version the loop first, if required, so the profitability check
8358 if (LOOP_REQUIRES_VERSIONING (loop_vinfo
))
8360 poly_uint64 versioning_threshold
8361 = LOOP_VINFO_VERSIONING_THRESHOLD (loop_vinfo
);
8362 if (check_profitability
8363 && ordered_p (poly_uint64 (th
), versioning_threshold
))
8365 versioning_threshold
= ordered_max (poly_uint64 (th
),
8366 versioning_threshold
);
8367 check_profitability
= false;
8369 vect_loop_versioning (loop_vinfo
, th
, check_profitability
,
8370 versioning_threshold
);
8371 check_profitability
= false;
8374 /* Make sure there exists a single-predecessor exit bb also on the
8375 scalar loop copy. Do this after versioning but before peeling
8376 so CFG structure is fine for both scalar and if-converted loop
8377 to make slpeel_duplicate_current_defs_from_edges face matched
8378 loop closed PHI nodes on the exit. */
8379 if (LOOP_VINFO_SCALAR_LOOP (loop_vinfo
))
8381 e
= single_exit (LOOP_VINFO_SCALAR_LOOP (loop_vinfo
));
8382 if (! single_pred_p (e
->dest
))
8384 split_loop_exit_edge (e
);
8385 if (dump_enabled_p ())
8386 dump_printf (MSG_NOTE
, "split exit edge of scalar loop\n");
8390 tree niters
= vect_build_loop_niters (loop_vinfo
);
8391 LOOP_VINFO_NITERS_UNCHANGED (loop_vinfo
) = niters
;
8392 tree nitersm1
= unshare_expr (LOOP_VINFO_NITERSM1 (loop_vinfo
));
8393 bool niters_no_overflow
= loop_niters_no_overflow (loop_vinfo
);
8394 epilogue
= vect_do_peeling (loop_vinfo
, niters
, nitersm1
, &niters_vector
,
8395 &step_vector
, &niters_vector_mult_vf
, th
,
8396 check_profitability
, niters_no_overflow
);
8398 if (niters_vector
== NULL_TREE
)
8400 if (LOOP_VINFO_NITERS_KNOWN_P (loop_vinfo
)
8401 && !LOOP_VINFO_FULLY_MASKED_P (loop_vinfo
)
8402 && known_eq (lowest_vf
, vf
))
8405 = build_int_cst (TREE_TYPE (LOOP_VINFO_NITERS (loop_vinfo
)),
8406 LOOP_VINFO_INT_NITERS (loop_vinfo
) / lowest_vf
);
8407 step_vector
= build_one_cst (TREE_TYPE (niters
));
8410 vect_gen_vector_loop_niters (loop_vinfo
, niters
, &niters_vector
,
8411 &step_vector
, niters_no_overflow
);
8414 /* 1) Make sure the loop header has exactly two entries
8415 2) Make sure we have a preheader basic block. */
8417 gcc_assert (EDGE_COUNT (loop
->header
->preds
) == 2);
8419 split_edge (loop_preheader_edge (loop
));
8421 if (LOOP_VINFO_FULLY_MASKED_P (loop_vinfo
)
8422 && vect_use_loop_mask_for_alignment_p (loop_vinfo
))
8423 /* This will deal with any possible peeling. */
8424 vect_prepare_for_masked_peels (loop_vinfo
);
8426 /* FORNOW: the vectorizer supports only loops which body consist
8427 of one basic block (header + empty latch). When the vectorizer will
8428 support more involved loop forms, the order by which the BBs are
8429 traversed need to be reconsidered. */
8431 for (i
= 0; i
< nbbs
; i
++)
8433 basic_block bb
= bbs
[i
];
8434 stmt_vec_info stmt_info
;
8436 for (gphi_iterator si
= gsi_start_phis (bb
); !gsi_end_p (si
);
8439 gphi
*phi
= si
.phi ();
8440 if (dump_enabled_p ())
8442 dump_printf_loc (MSG_NOTE
, vect_location
,
8443 "------>vectorizing phi: ");
8444 dump_gimple_stmt (MSG_NOTE
, TDF_SLIM
, phi
, 0);
8446 stmt_info
= loop_vinfo
->lookup_stmt (phi
);
8450 if (MAY_HAVE_DEBUG_BIND_STMTS
&& !STMT_VINFO_LIVE_P (stmt_info
))
8451 vect_loop_kill_debug_uses (loop
, phi
);
8453 if (!STMT_VINFO_RELEVANT_P (stmt_info
)
8454 && !STMT_VINFO_LIVE_P (stmt_info
))
8457 if (STMT_VINFO_VECTYPE (stmt_info
)
8459 (TYPE_VECTOR_SUBPARTS (STMT_VINFO_VECTYPE (stmt_info
)), vf
))
8460 && dump_enabled_p ())
8461 dump_printf_loc (MSG_NOTE
, vect_location
, "multiple-types.\n");
8463 if ((STMT_VINFO_DEF_TYPE (stmt_info
) == vect_induction_def
8464 || STMT_VINFO_DEF_TYPE (stmt_info
) == vect_reduction_def
8465 || STMT_VINFO_DEF_TYPE (stmt_info
) == vect_nested_cycle
)
8466 && ! PURE_SLP_STMT (stmt_info
))
8468 if (dump_enabled_p ())
8469 dump_printf_loc (MSG_NOTE
, vect_location
, "transform phi.\n");
8470 vect_transform_stmt (phi
, NULL
, NULL
, NULL
, NULL
);
8474 for (gimple_stmt_iterator si
= gsi_start_bb (bb
);
8477 stmt
= gsi_stmt (si
);
8478 /* During vectorization remove existing clobber stmts. */
8479 if (gimple_clobber_p (stmt
))
8481 unlink_stmt_vdef (stmt
);
8482 gsi_remove (&si
, true);
8483 release_defs (stmt
);
8487 stmt_info
= loop_vinfo
->lookup_stmt (stmt
);
8489 /* vector stmts created in the outer-loop during vectorization of
8490 stmts in an inner-loop may not have a stmt_info, and do not
8491 need to be vectorized. */
8492 stmt_vec_info seen_store
= NULL
;
8495 if (STMT_VINFO_IN_PATTERN_P (stmt_info
))
8497 gimple
*def_seq
= STMT_VINFO_PATTERN_DEF_SEQ (stmt_info
);
8498 for (gimple_stmt_iterator subsi
= gsi_start (def_seq
);
8499 !gsi_end_p (subsi
); gsi_next (&subsi
))
8500 vect_transform_loop_stmt (loop_vinfo
,
8501 gsi_stmt (subsi
), &si
,
8504 gimple
*pat_stmt
= STMT_VINFO_RELATED_STMT (stmt_info
);
8505 vect_transform_loop_stmt (loop_vinfo
, pat_stmt
, &si
,
8506 &seen_store
, &slp_scheduled
);
8508 vect_transform_loop_stmt (loop_vinfo
, stmt
, &si
,
8509 &seen_store
, &slp_scheduled
);
8513 if (STMT_VINFO_GROUPED_ACCESS (seen_store
))
8515 /* Interleaving. If IS_STORE is TRUE, the
8516 vectorization of the interleaving chain was
8517 completed - free all the stores in the chain. */
8519 vect_remove_stores (DR_GROUP_FIRST_ELEMENT (seen_store
));
8523 /* Free the attached stmt_vec_info and remove the
8525 free_stmt_vec_info (stmt
);
8526 unlink_stmt_vdef (stmt
);
8527 gsi_remove (&si
, true);
8528 release_defs (stmt
);
8536 /* Stub out scalar statements that must not survive vectorization.
8537 Doing this here helps with grouped statements, or statements that
8538 are involved in patterns. */
8539 for (gimple_stmt_iterator gsi
= gsi_start_bb (bb
);
8540 !gsi_end_p (gsi
); gsi_next (&gsi
))
8542 gcall
*call
= dyn_cast
<gcall
*> (gsi_stmt (gsi
));
8543 if (call
&& gimple_call_internal_p (call
, IFN_MASK_LOAD
))
8545 tree lhs
= gimple_get_lhs (call
);
8546 if (!VECTOR_TYPE_P (TREE_TYPE (lhs
)))
8548 tree zero
= build_zero_cst (TREE_TYPE (lhs
));
8549 gimple
*new_stmt
= gimple_build_assign (lhs
, zero
);
8550 gsi_replace (&gsi
, new_stmt
, true);
8556 /* The vectorization factor is always > 1, so if we use an IV increment of 1.
8557 a zero NITERS becomes a nonzero NITERS_VECTOR. */
8558 if (integer_onep (step_vector
))
8559 niters_no_overflow
= true;
8560 vect_set_loop_condition (loop
, loop_vinfo
, niters_vector
, step_vector
,
8561 niters_vector_mult_vf
, !niters_no_overflow
);
8563 unsigned int assumed_vf
= vect_vf_for_cost (loop_vinfo
);
8564 scale_profile_for_vect_loop (loop
, assumed_vf
);
8566 /* True if the final iteration might not handle a full vector's
8567 worth of scalar iterations. */
8568 bool final_iter_may_be_partial
= LOOP_VINFO_FULLY_MASKED_P (loop_vinfo
);
8569 /* The minimum number of iterations performed by the epilogue. This
8570 is 1 when peeling for gaps because we always need a final scalar
8572 int min_epilogue_iters
= LOOP_VINFO_PEELING_FOR_GAPS (loop_vinfo
) ? 1 : 0;
8573 /* +1 to convert latch counts to loop iteration counts,
8574 -min_epilogue_iters to remove iterations that cannot be performed
8575 by the vector code. */
8576 int bias_for_lowest
= 1 - min_epilogue_iters
;
8577 int bias_for_assumed
= bias_for_lowest
;
8578 int alignment_npeels
= LOOP_VINFO_PEELING_FOR_ALIGNMENT (loop_vinfo
);
8579 if (alignment_npeels
&& LOOP_VINFO_FULLY_MASKED_P (loop_vinfo
))
8581 /* When the amount of peeling is known at compile time, the first
8582 iteration will have exactly alignment_npeels active elements.
8583 In the worst case it will have at least one. */
8584 int min_first_active
= (alignment_npeels
> 0 ? alignment_npeels
: 1);
8585 bias_for_lowest
+= lowest_vf
- min_first_active
;
8586 bias_for_assumed
+= assumed_vf
- min_first_active
;
8588 /* In these calculations the "- 1" converts loop iteration counts
8589 back to latch counts. */
8590 if (loop
->any_upper_bound
)
8591 loop
->nb_iterations_upper_bound
8592 = (final_iter_may_be_partial
8593 ? wi::udiv_ceil (loop
->nb_iterations_upper_bound
+ bias_for_lowest
,
8595 : wi::udiv_floor (loop
->nb_iterations_upper_bound
+ bias_for_lowest
,
8597 if (loop
->any_likely_upper_bound
)
8598 loop
->nb_iterations_likely_upper_bound
8599 = (final_iter_may_be_partial
8600 ? wi::udiv_ceil (loop
->nb_iterations_likely_upper_bound
8601 + bias_for_lowest
, lowest_vf
) - 1
8602 : wi::udiv_floor (loop
->nb_iterations_likely_upper_bound
8603 + bias_for_lowest
, lowest_vf
) - 1);
8604 if (loop
->any_estimate
)
8605 loop
->nb_iterations_estimate
8606 = (final_iter_may_be_partial
8607 ? wi::udiv_ceil (loop
->nb_iterations_estimate
+ bias_for_assumed
,
8609 : wi::udiv_floor (loop
->nb_iterations_estimate
+ bias_for_assumed
,
8612 if (dump_enabled_p ())
8614 if (!LOOP_VINFO_EPILOGUE_P (loop_vinfo
))
8616 dump_printf_loc (MSG_NOTE
, vect_location
,
8617 "LOOP VECTORIZED\n");
8619 dump_printf_loc (MSG_NOTE
, vect_location
,
8620 "OUTER LOOP VECTORIZED\n");
8621 dump_printf (MSG_NOTE
, "\n");
8625 dump_printf_loc (MSG_NOTE
, vect_location
,
8626 "LOOP EPILOGUE VECTORIZED (VS=");
8627 dump_dec (MSG_NOTE
, current_vector_size
);
8628 dump_printf (MSG_NOTE
, ")\n");
8632 /* Free SLP instances here because otherwise stmt reference counting
8634 slp_instance instance
;
8635 FOR_EACH_VEC_ELT (LOOP_VINFO_SLP_INSTANCES (loop_vinfo
), i
, instance
)
8636 vect_free_slp_instance (instance
, true);
8637 LOOP_VINFO_SLP_INSTANCES (loop_vinfo
).release ();
8638 /* Clear-up safelen field since its value is invalid after vectorization
8639 since vectorized loop can have loop-carried dependencies. */
8642 /* Don't vectorize epilogue for epilogue. */
8643 if (LOOP_VINFO_EPILOGUE_P (loop_vinfo
))
8646 if (!PARAM_VALUE (PARAM_VECT_EPILOGUES_NOMASK
))
8651 auto_vector_sizes vector_sizes
;
8652 targetm
.vectorize
.autovectorize_vector_sizes (&vector_sizes
);
8653 unsigned int next_size
= 0;
8655 if (LOOP_VINFO_NITERS_KNOWN_P (loop_vinfo
)
8656 && LOOP_VINFO_PEELING_FOR_ALIGNMENT (loop_vinfo
) >= 0
8657 && known_eq (vf
, lowest_vf
))
8660 = (LOOP_VINFO_INT_NITERS (loop_vinfo
)
8661 - LOOP_VINFO_PEELING_FOR_ALIGNMENT (loop_vinfo
));
8662 eiters
= eiters
% lowest_vf
;
8663 epilogue
->nb_iterations_upper_bound
= eiters
- 1;
8666 while (next_size
< vector_sizes
.length ()
8667 && !(constant_multiple_p (current_vector_size
,
8668 vector_sizes
[next_size
], &ratio
)
8669 && eiters
>= lowest_vf
/ ratio
))
8673 while (next_size
< vector_sizes
.length ()
8674 && maybe_lt (current_vector_size
, vector_sizes
[next_size
]))
8677 if (next_size
== vector_sizes
.length ())
8683 epilogue
->force_vectorize
= loop
->force_vectorize
;
8684 epilogue
->safelen
= loop
->safelen
;
8685 epilogue
->dont_vectorize
= false;
8687 /* We may need to if-convert epilogue to vectorize it. */
8688 if (LOOP_VINFO_SCALAR_LOOP (loop_vinfo
))
8689 tree_if_conversion (epilogue
);
8695 /* The code below is trying to perform simple optimization - revert
8696 if-conversion for masked stores, i.e. if the mask of a store is zero
8697 do not perform it and all stored value producers also if possible.
8705 this transformation will produce the following semi-hammock:
8707 if (!mask__ifc__42.18_165 == { 0, 0, 0, 0, 0, 0, 0, 0 })
8709 vect__11.19_170 = MASK_LOAD (vectp_p1.20_168, 0B, mask__ifc__42.18_165);
8710 vect__12.22_172 = vect__11.19_170 + vect_cst__171;
8711 MASK_STORE (vectp_p1.23_175, 0B, mask__ifc__42.18_165, vect__12.22_172);
8712 vect__18.25_182 = MASK_LOAD (vectp_p3.26_180, 0B, mask__ifc__42.18_165);
8713 vect__19.28_184 = vect__18.25_182 + vect_cst__183;
8714 MASK_STORE (vectp_p2.29_187, 0B, mask__ifc__42.18_165, vect__19.28_184);
8719 optimize_mask_stores (struct loop
*loop
)
8721 basic_block
*bbs
= get_loop_body (loop
);
8722 unsigned nbbs
= loop
->num_nodes
;
8725 struct loop
*bb_loop
;
8726 gimple_stmt_iterator gsi
;
8728 auto_vec
<gimple
*> worklist
;
8730 vect_location
= find_loop_location (loop
);
8731 /* Pick up all masked stores in loop if any. */
8732 for (i
= 0; i
< nbbs
; i
++)
8735 for (gsi
= gsi_start_bb (bb
); !gsi_end_p (gsi
);
8738 stmt
= gsi_stmt (gsi
);
8739 if (gimple_call_internal_p (stmt
, IFN_MASK_STORE
))
8740 worklist
.safe_push (stmt
);
8745 if (worklist
.is_empty ())
8748 /* Loop has masked stores. */
8749 while (!worklist
.is_empty ())
8751 gimple
*last
, *last_store
;
8754 basic_block store_bb
, join_bb
;
8755 gimple_stmt_iterator gsi_to
;
8756 tree vdef
, new_vdef
;
8761 last
= worklist
.pop ();
8762 mask
= gimple_call_arg (last
, 2);
8763 bb
= gimple_bb (last
);
8764 /* Create then_bb and if-then structure in CFG, then_bb belongs to
8765 the same loop as if_bb. It could be different to LOOP when two
8766 level loop-nest is vectorized and mask_store belongs to the inner
8768 e
= split_block (bb
, last
);
8769 bb_loop
= bb
->loop_father
;
8770 gcc_assert (loop
== bb_loop
|| flow_loop_nested_p (loop
, bb_loop
));
8772 store_bb
= create_empty_bb (bb
);
8773 add_bb_to_loop (store_bb
, bb_loop
);
8774 e
->flags
= EDGE_TRUE_VALUE
;
8775 efalse
= make_edge (bb
, store_bb
, EDGE_FALSE_VALUE
);
8776 /* Put STORE_BB to likely part. */
8777 efalse
->probability
= profile_probability::unlikely ();
8778 store_bb
->count
= efalse
->count ();
8779 make_single_succ_edge (store_bb
, join_bb
, EDGE_FALLTHRU
);
8780 if (dom_info_available_p (CDI_DOMINATORS
))
8781 set_immediate_dominator (CDI_DOMINATORS
, store_bb
, bb
);
8782 if (dump_enabled_p ())
8783 dump_printf_loc (MSG_NOTE
, vect_location
,
8784 "Create new block %d to sink mask stores.",
8786 /* Create vector comparison with boolean result. */
8787 vectype
= TREE_TYPE (mask
);
8788 zero
= build_zero_cst (vectype
);
8789 stmt
= gimple_build_cond (EQ_EXPR
, mask
, zero
, NULL_TREE
, NULL_TREE
);
8790 gsi
= gsi_last_bb (bb
);
8791 gsi_insert_after (&gsi
, stmt
, GSI_SAME_STMT
);
8792 /* Create new PHI node for vdef of the last masked store:
8793 .MEM_2 = VDEF <.MEM_1>
8794 will be converted to
8795 .MEM.3 = VDEF <.MEM_1>
8796 and new PHI node will be created in join bb
8797 .MEM_2 = PHI <.MEM_1, .MEM_3>
8799 vdef
= gimple_vdef (last
);
8800 new_vdef
= make_ssa_name (gimple_vop (cfun
), last
);
8801 gimple_set_vdef (last
, new_vdef
);
8802 phi
= create_phi_node (vdef
, join_bb
);
8803 add_phi_arg (phi
, new_vdef
, EDGE_SUCC (store_bb
, 0), UNKNOWN_LOCATION
);
8805 /* Put all masked stores with the same mask to STORE_BB if possible. */
8808 gimple_stmt_iterator gsi_from
;
8809 gimple
*stmt1
= NULL
;
8811 /* Move masked store to STORE_BB. */
8813 gsi
= gsi_for_stmt (last
);
8815 /* Shift GSI to the previous stmt for further traversal. */
8817 gsi_to
= gsi_start_bb (store_bb
);
8818 gsi_move_before (&gsi_from
, &gsi_to
);
8819 /* Setup GSI_TO to the non-empty block start. */
8820 gsi_to
= gsi_start_bb (store_bb
);
8821 if (dump_enabled_p ())
8823 dump_printf_loc (MSG_NOTE
, vect_location
,
8824 "Move stmt to created bb\n");
8825 dump_gimple_stmt (MSG_NOTE
, TDF_SLIM
, last
, 0);
8827 /* Move all stored value producers if possible. */
8828 while (!gsi_end_p (gsi
))
8831 imm_use_iterator imm_iter
;
8832 use_operand_p use_p
;
8835 /* Skip debug statements. */
8836 if (is_gimple_debug (gsi_stmt (gsi
)))
8841 stmt1
= gsi_stmt (gsi
);
8842 /* Do not consider statements writing to memory or having
8843 volatile operand. */
8844 if (gimple_vdef (stmt1
)
8845 || gimple_has_volatile_ops (stmt1
))
8849 lhs
= gimple_get_lhs (stmt1
);
8853 /* LHS of vectorized stmt must be SSA_NAME. */
8854 if (TREE_CODE (lhs
) != SSA_NAME
)
8857 if (!VECTOR_TYPE_P (TREE_TYPE (lhs
)))
8859 /* Remove dead scalar statement. */
8860 if (has_zero_uses (lhs
))
8862 gsi_remove (&gsi_from
, true);
8867 /* Check that LHS does not have uses outside of STORE_BB. */
8869 FOR_EACH_IMM_USE_FAST (use_p
, imm_iter
, lhs
)
8872 use_stmt
= USE_STMT (use_p
);
8873 if (is_gimple_debug (use_stmt
))
8875 if (gimple_bb (use_stmt
) != store_bb
)
8884 if (gimple_vuse (stmt1
)
8885 && gimple_vuse (stmt1
) != gimple_vuse (last_store
))
8888 /* Can move STMT1 to STORE_BB. */
8889 if (dump_enabled_p ())
8891 dump_printf_loc (MSG_NOTE
, vect_location
,
8892 "Move stmt to created bb\n");
8893 dump_gimple_stmt (MSG_NOTE
, TDF_SLIM
, stmt1
, 0);
8895 gsi_move_before (&gsi_from
, &gsi_to
);
8896 /* Shift GSI_TO for further insertion. */
8899 /* Put other masked stores with the same mask to STORE_BB. */
8900 if (worklist
.is_empty ()
8901 || gimple_call_arg (worklist
.last (), 2) != mask
8902 || worklist
.last () != stmt1
)
8904 last
= worklist
.pop ();
8906 add_phi_arg (phi
, gimple_vuse (last_store
), e
, UNKNOWN_LOCATION
);