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cbdd87d4 | 1 | /* Statement simplification on GIMPLE. |
23a5b65a | 2 | Copyright (C) 2010-2014 Free Software Foundation, Inc. |
cbdd87d4 RG |
3 | Split out from tree-ssa-ccp.c. |
4 | ||
5 | This file is part of GCC. | |
6 | ||
7 | GCC is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU General Public License as published by the | |
9 | Free Software Foundation; either version 3, or (at your option) any | |
10 | later version. | |
11 | ||
12 | GCC is distributed in the hope that it will be useful, but WITHOUT | |
13 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GCC; see the file COPYING3. If not see | |
19 | <http://www.gnu.org/licenses/>. */ | |
20 | ||
21 | #include "config.h" | |
22 | #include "system.h" | |
23 | #include "coretypes.h" | |
24 | #include "tm.h" | |
25 | #include "tree.h" | |
d8a2d370 DN |
26 | #include "stringpool.h" |
27 | #include "expr.h" | |
28 | #include "stmt.h" | |
29 | #include "stor-layout.h" | |
cbdd87d4 | 30 | #include "flags.h" |
83685514 AM |
31 | #include "hashtab.h" |
32 | #include "hash-set.h" | |
33 | #include "vec.h" | |
34 | #include "machmode.h" | |
35 | #include "hard-reg-set.h" | |
36 | #include "input.h" | |
cbdd87d4 | 37 | #include "function.h" |
7ee2468b | 38 | #include "dumpfile.h" |
442b4905 | 39 | #include "bitmap.h" |
60393bbc AM |
40 | #include "predict.h" |
41 | #include "dominance.h" | |
2fb9a547 AM |
42 | #include "basic-block.h" |
43 | #include "tree-ssa-alias.h" | |
44 | #include "internal-fn.h" | |
45 | #include "gimple-fold.h" | |
46 | #include "gimple-expr.h" | |
47 | #include "is-a.h" | |
18f429e2 | 48 | #include "gimple.h" |
45b0be94 | 49 | #include "gimplify.h" |
5be5c238 | 50 | #include "gimple-iterator.h" |
442b4905 AM |
51 | #include "gimple-ssa.h" |
52 | #include "tree-ssanames.h" | |
53 | #include "tree-into-ssa.h" | |
54 | #include "tree-dfa.h" | |
7a300452 | 55 | #include "tree-ssa.h" |
cbdd87d4 | 56 | #include "tree-ssa-propagate.h" |
cbdd87d4 | 57 | #include "target.h" |
c582198b AM |
58 | #include "hash-map.h" |
59 | #include "plugin-api.h" | |
60 | #include "ipa-ref.h" | |
61 | #include "cgraph.h" | |
450ad0cd JH |
62 | #include "ipa-utils.h" |
63 | #include "gimple-pretty-print.h" | |
4484a35a | 64 | #include "tree-ssa-address.h" |
862d0b35 | 65 | #include "langhooks.h" |
19e51b40 | 66 | #include "gimplify-me.h" |
2b5f0895 | 67 | #include "dbgcnt.h" |
9b2b7279 | 68 | #include "builtins.h" |
fef5a0d9 | 69 | #include "output.h" |
e0ee10ed RB |
70 | #include "tree-eh.h" |
71 | #include "gimple-match.h" | |
45cc9f96 RB |
72 | #include "tree-phinodes.h" |
73 | #include "ssa-iterators.h" | |
cbdd87d4 | 74 | |
b3b9f3d0 | 75 | /* Return true when DECL can be referenced from current unit. |
c44c2088 JH |
76 | FROM_DECL (if non-null) specify constructor of variable DECL was taken from. |
77 | We can get declarations that are not possible to reference for various | |
78 | reasons: | |
1389294c | 79 | |
1389294c JH |
80 | 1) When analyzing C++ virtual tables. |
81 | C++ virtual tables do have known constructors even | |
82 | when they are keyed to other compilation unit. | |
83 | Those tables can contain pointers to methods and vars | |
84 | in other units. Those methods have both STATIC and EXTERNAL | |
85 | set. | |
86 | 2) In WHOPR mode devirtualization might lead to reference | |
87 | to method that was partitioned elsehwere. | |
88 | In this case we have static VAR_DECL or FUNCTION_DECL | |
89 | that has no corresponding callgraph/varpool node | |
b3b9f3d0 JH |
90 | declaring the body. |
91 | 3) COMDAT functions referred by external vtables that | |
3e89949e | 92 | we devirtualize only during final compilation stage. |
b3b9f3d0 JH |
93 | At this time we already decided that we will not output |
94 | the function body and thus we can't reference the symbol | |
95 | directly. */ | |
96 | ||
1389294c | 97 | static bool |
c44c2088 | 98 | can_refer_decl_in_current_unit_p (tree decl, tree from_decl) |
1389294c | 99 | { |
2c8326a5 | 100 | varpool_node *vnode; |
1389294c | 101 | struct cgraph_node *node; |
5e20cdc9 | 102 | symtab_node *snode; |
c44c2088 | 103 | |
00de328a | 104 | if (DECL_ABSTRACT_P (decl)) |
1632a686 JH |
105 | return false; |
106 | ||
107 | /* We are concerned only about static/external vars and functions. */ | |
108 | if ((!TREE_STATIC (decl) && !DECL_EXTERNAL (decl)) | |
109 | || (TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != FUNCTION_DECL)) | |
110 | return true; | |
111 | ||
112 | /* Static objects can be referred only if they was not optimized out yet. */ | |
113 | if (!TREE_PUBLIC (decl) && !DECL_EXTERNAL (decl)) | |
114 | { | |
3aaf0529 JH |
115 | /* Before we start optimizing unreachable code we can be sure all |
116 | static objects are defined. */ | |
3dafb85c | 117 | if (symtab->function_flags_ready) |
3aaf0529 | 118 | return true; |
d52f5295 | 119 | snode = symtab_node::get (decl); |
3aaf0529 | 120 | if (!snode || !snode->definition) |
1632a686 | 121 | return false; |
7de90a6c | 122 | node = dyn_cast <cgraph_node *> (snode); |
1632a686 JH |
123 | return !node || !node->global.inlined_to; |
124 | } | |
125 | ||
6da8be89 | 126 | /* We will later output the initializer, so we can refer to it. |
c44c2088 | 127 | So we are concerned only when DECL comes from initializer of |
3aaf0529 | 128 | external var or var that has been optimized out. */ |
c44c2088 JH |
129 | if (!from_decl |
130 | || TREE_CODE (from_decl) != VAR_DECL | |
3aaf0529 | 131 | || (!DECL_EXTERNAL (from_decl) |
9041d2e6 | 132 | && (vnode = varpool_node::get (from_decl)) != NULL |
3aaf0529 | 133 | && vnode->definition) |
6da8be89 | 134 | || (flag_ltrans |
9041d2e6 | 135 | && (vnode = varpool_node::get (from_decl)) != NULL |
6adda80b | 136 | && vnode->in_other_partition)) |
c44c2088 | 137 | return true; |
c44c2088 JH |
138 | /* We are folding reference from external vtable. The vtable may reffer |
139 | to a symbol keyed to other compilation unit. The other compilation | |
140 | unit may be in separate DSO and the symbol may be hidden. */ | |
141 | if (DECL_VISIBILITY_SPECIFIED (decl) | |
142 | && DECL_EXTERNAL (decl) | |
a33a931b | 143 | && DECL_VISIBILITY (decl) != VISIBILITY_DEFAULT |
d52f5295 | 144 | && (!(snode = symtab_node::get (decl)) || !snode->in_other_partition)) |
c44c2088 | 145 | return false; |
b3b9f3d0 JH |
146 | /* When function is public, we always can introduce new reference. |
147 | Exception are the COMDAT functions where introducing a direct | |
148 | reference imply need to include function body in the curren tunit. */ | |
149 | if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl)) | |
150 | return true; | |
3aaf0529 JH |
151 | /* We have COMDAT. We are going to check if we still have definition |
152 | or if the definition is going to be output in other partition. | |
153 | Bypass this when gimplifying; all needed functions will be produced. | |
c44c2088 JH |
154 | |
155 | As observed in PR20991 for already optimized out comdat virtual functions | |
073a8998 | 156 | it may be tempting to not necessarily give up because the copy will be |
c44c2088 JH |
157 | output elsewhere when corresponding vtable is output. |
158 | This is however not possible - ABI specify that COMDATs are output in | |
159 | units where they are used and when the other unit was compiled with LTO | |
160 | it is possible that vtable was kept public while the function itself | |
161 | was privatized. */ | |
3dafb85c | 162 | if (!symtab->function_flags_ready) |
b3b9f3d0 | 163 | return true; |
c44c2088 | 164 | |
d52f5295 | 165 | snode = symtab_node::get (decl); |
3aaf0529 JH |
166 | if (!snode |
167 | || ((!snode->definition || DECL_EXTERNAL (decl)) | |
168 | && (!snode->in_other_partition | |
169 | || (!snode->forced_by_abi && !snode->force_output)))) | |
170 | return false; | |
171 | node = dyn_cast <cgraph_node *> (snode); | |
172 | return !node || !node->global.inlined_to; | |
1389294c JH |
173 | } |
174 | ||
0038d4e0 | 175 | /* CVAL is value taken from DECL_INITIAL of variable. Try to transform it into |
c44c2088 JH |
176 | acceptable form for is_gimple_min_invariant. |
177 | FROM_DECL (if non-NULL) specify variable whose constructor contains CVAL. */ | |
17f39a39 JH |
178 | |
179 | tree | |
c44c2088 | 180 | canonicalize_constructor_val (tree cval, tree from_decl) |
17f39a39 | 181 | { |
50619002 EB |
182 | tree orig_cval = cval; |
183 | STRIP_NOPS (cval); | |
315f5f1b RG |
184 | if (TREE_CODE (cval) == POINTER_PLUS_EXPR |
185 | && TREE_CODE (TREE_OPERAND (cval, 1)) == INTEGER_CST) | |
17f39a39 | 186 | { |
315f5f1b RG |
187 | tree ptr = TREE_OPERAND (cval, 0); |
188 | if (is_gimple_min_invariant (ptr)) | |
189 | cval = build1_loc (EXPR_LOCATION (cval), | |
190 | ADDR_EXPR, TREE_TYPE (ptr), | |
191 | fold_build2 (MEM_REF, TREE_TYPE (TREE_TYPE (ptr)), | |
192 | ptr, | |
193 | fold_convert (ptr_type_node, | |
194 | TREE_OPERAND (cval, 1)))); | |
17f39a39 JH |
195 | } |
196 | if (TREE_CODE (cval) == ADDR_EXPR) | |
197 | { | |
5a27a197 RG |
198 | tree base = NULL_TREE; |
199 | if (TREE_CODE (TREE_OPERAND (cval, 0)) == COMPOUND_LITERAL_EXPR) | |
ca5f4331 MM |
200 | { |
201 | base = COMPOUND_LITERAL_EXPR_DECL (TREE_OPERAND (cval, 0)); | |
202 | if (base) | |
203 | TREE_OPERAND (cval, 0) = base; | |
204 | } | |
5a27a197 RG |
205 | else |
206 | base = get_base_address (TREE_OPERAND (cval, 0)); | |
7501ca28 RG |
207 | if (!base) |
208 | return NULL_TREE; | |
b3b9f3d0 | 209 | |
7501ca28 RG |
210 | if ((TREE_CODE (base) == VAR_DECL |
211 | || TREE_CODE (base) == FUNCTION_DECL) | |
c44c2088 | 212 | && !can_refer_decl_in_current_unit_p (base, from_decl)) |
1389294c | 213 | return NULL_TREE; |
7501ca28 | 214 | if (TREE_CODE (base) == VAR_DECL) |
46eb666a | 215 | TREE_ADDRESSABLE (base) = 1; |
7501ca28 RG |
216 | else if (TREE_CODE (base) == FUNCTION_DECL) |
217 | { | |
218 | /* Make sure we create a cgraph node for functions we'll reference. | |
219 | They can be non-existent if the reference comes from an entry | |
220 | of an external vtable for example. */ | |
d52f5295 | 221 | cgraph_node::get_create (base); |
7501ca28 | 222 | } |
0038d4e0 | 223 | /* Fixup types in global initializers. */ |
73aef89e RG |
224 | if (TREE_TYPE (TREE_TYPE (cval)) != TREE_TYPE (TREE_OPERAND (cval, 0))) |
225 | cval = build_fold_addr_expr (TREE_OPERAND (cval, 0)); | |
50619002 EB |
226 | |
227 | if (!useless_type_conversion_p (TREE_TYPE (orig_cval), TREE_TYPE (cval))) | |
228 | cval = fold_convert (TREE_TYPE (orig_cval), cval); | |
229 | return cval; | |
17f39a39 | 230 | } |
846abd0d RB |
231 | if (TREE_OVERFLOW_P (cval)) |
232 | return drop_tree_overflow (cval); | |
50619002 | 233 | return orig_cval; |
17f39a39 | 234 | } |
cbdd87d4 RG |
235 | |
236 | /* If SYM is a constant variable with known value, return the value. | |
237 | NULL_TREE is returned otherwise. */ | |
238 | ||
239 | tree | |
240 | get_symbol_constant_value (tree sym) | |
241 | { | |
6a6dac52 JH |
242 | tree val = ctor_for_folding (sym); |
243 | if (val != error_mark_node) | |
cbdd87d4 | 244 | { |
cbdd87d4 RG |
245 | if (val) |
246 | { | |
9d60be38 | 247 | val = canonicalize_constructor_val (unshare_expr (val), sym); |
1389294c | 248 | if (val && is_gimple_min_invariant (val)) |
17f39a39 | 249 | return val; |
1389294c JH |
250 | else |
251 | return NULL_TREE; | |
cbdd87d4 RG |
252 | } |
253 | /* Variables declared 'const' without an initializer | |
254 | have zero as the initializer if they may not be | |
255 | overridden at link or run time. */ | |
256 | if (!val | |
b8a8c472 | 257 | && is_gimple_reg_type (TREE_TYPE (sym))) |
e8160c9a | 258 | return build_zero_cst (TREE_TYPE (sym)); |
cbdd87d4 RG |
259 | } |
260 | ||
261 | return NULL_TREE; | |
262 | } | |
263 | ||
264 | ||
cbdd87d4 RG |
265 | |
266 | /* Subroutine of fold_stmt. We perform several simplifications of the | |
267 | memory reference tree EXPR and make sure to re-gimplify them properly | |
268 | after propagation of constant addresses. IS_LHS is true if the | |
269 | reference is supposed to be an lvalue. */ | |
270 | ||
271 | static tree | |
272 | maybe_fold_reference (tree expr, bool is_lhs) | |
273 | { | |
17f39a39 | 274 | tree result; |
cbdd87d4 | 275 | |
f0eddb90 RG |
276 | if ((TREE_CODE (expr) == VIEW_CONVERT_EXPR |
277 | || TREE_CODE (expr) == REALPART_EXPR | |
278 | || TREE_CODE (expr) == IMAGPART_EXPR) | |
279 | && CONSTANT_CLASS_P (TREE_OPERAND (expr, 0))) | |
280 | return fold_unary_loc (EXPR_LOCATION (expr), | |
281 | TREE_CODE (expr), | |
282 | TREE_TYPE (expr), | |
283 | TREE_OPERAND (expr, 0)); | |
284 | else if (TREE_CODE (expr) == BIT_FIELD_REF | |
285 | && CONSTANT_CLASS_P (TREE_OPERAND (expr, 0))) | |
286 | return fold_ternary_loc (EXPR_LOCATION (expr), | |
287 | TREE_CODE (expr), | |
288 | TREE_TYPE (expr), | |
289 | TREE_OPERAND (expr, 0), | |
290 | TREE_OPERAND (expr, 1), | |
291 | TREE_OPERAND (expr, 2)); | |
292 | ||
f0eddb90 RG |
293 | if (!is_lhs |
294 | && (result = fold_const_aggregate_ref (expr)) | |
295 | && is_gimple_min_invariant (result)) | |
296 | return result; | |
cbdd87d4 | 297 | |
cbdd87d4 RG |
298 | return NULL_TREE; |
299 | } | |
300 | ||
301 | ||
302 | /* Attempt to fold an assignment statement pointed-to by SI. Returns a | |
303 | replacement rhs for the statement or NULL_TREE if no simplification | |
304 | could be made. It is assumed that the operands have been previously | |
305 | folded. */ | |
306 | ||
307 | static tree | |
308 | fold_gimple_assign (gimple_stmt_iterator *si) | |
309 | { | |
310 | gimple stmt = gsi_stmt (*si); | |
311 | enum tree_code subcode = gimple_assign_rhs_code (stmt); | |
312 | location_t loc = gimple_location (stmt); | |
313 | ||
314 | tree result = NULL_TREE; | |
315 | ||
316 | switch (get_gimple_rhs_class (subcode)) | |
317 | { | |
318 | case GIMPLE_SINGLE_RHS: | |
319 | { | |
320 | tree rhs = gimple_assign_rhs1 (stmt); | |
321 | ||
8c00ba08 JW |
322 | if (TREE_CLOBBER_P (rhs)) |
323 | return NULL_TREE; | |
324 | ||
4e71066d | 325 | if (REFERENCE_CLASS_P (rhs)) |
cbdd87d4 RG |
326 | return maybe_fold_reference (rhs, false); |
327 | ||
bdf37f7a JH |
328 | else if (TREE_CODE (rhs) == OBJ_TYPE_REF) |
329 | { | |
330 | tree val = OBJ_TYPE_REF_EXPR (rhs); | |
331 | if (is_gimple_min_invariant (val)) | |
332 | return val; | |
f8a39967 | 333 | else if (flag_devirtualize && virtual_method_call_p (rhs)) |
bdf37f7a JH |
334 | { |
335 | bool final; | |
336 | vec <cgraph_node *>targets | |
f8a39967 | 337 | = possible_polymorphic_call_targets (rhs, stmt, &final); |
2b5f0895 | 338 | if (final && targets.length () <= 1 && dbg_cnt (devirt)) |
bdf37f7a | 339 | { |
2b5f0895 XDL |
340 | if (dump_enabled_p ()) |
341 | { | |
807b7d62 | 342 | location_t loc = gimple_location_safe (stmt); |
2b5f0895 XDL |
343 | dump_printf_loc (MSG_OPTIMIZED_LOCATIONS, loc, |
344 | "resolving virtual function address " | |
345 | "reference to function %s\n", | |
346 | targets.length () == 1 | |
347 | ? targets[0]->name () | |
3ef276e4 | 348 | : "NULL"); |
2b5f0895 | 349 | } |
3ef276e4 RB |
350 | if (targets.length () == 1) |
351 | { | |
352 | val = fold_convert (TREE_TYPE (val), | |
353 | build_fold_addr_expr_loc | |
354 | (loc, targets[0]->decl)); | |
355 | STRIP_USELESS_TYPE_CONVERSION (val); | |
356 | } | |
357 | else | |
358 | /* We can not use __builtin_unreachable here because it | |
359 | can not have address taken. */ | |
360 | val = build_int_cst (TREE_TYPE (val), 0); | |
bdf37f7a JH |
361 | return val; |
362 | } | |
363 | } | |
364 | ||
365 | } | |
cbdd87d4 RG |
366 | else if (TREE_CODE (rhs) == ADDR_EXPR) |
367 | { | |
70f34814 RG |
368 | tree ref = TREE_OPERAND (rhs, 0); |
369 | tree tem = maybe_fold_reference (ref, true); | |
370 | if (tem | |
371 | && TREE_CODE (tem) == MEM_REF | |
372 | && integer_zerop (TREE_OPERAND (tem, 1))) | |
373 | result = fold_convert (TREE_TYPE (rhs), TREE_OPERAND (tem, 0)); | |
374 | else if (tem) | |
cbdd87d4 RG |
375 | result = fold_convert (TREE_TYPE (rhs), |
376 | build_fold_addr_expr_loc (loc, tem)); | |
70f34814 RG |
377 | else if (TREE_CODE (ref) == MEM_REF |
378 | && integer_zerop (TREE_OPERAND (ref, 1))) | |
379 | result = fold_convert (TREE_TYPE (rhs), TREE_OPERAND (ref, 0)); | |
cbdd87d4 RG |
380 | } |
381 | ||
382 | else if (TREE_CODE (rhs) == CONSTRUCTOR | |
383 | && TREE_CODE (TREE_TYPE (rhs)) == VECTOR_TYPE | |
384 | && (CONSTRUCTOR_NELTS (rhs) | |
385 | == TYPE_VECTOR_SUBPARTS (TREE_TYPE (rhs)))) | |
386 | { | |
387 | /* Fold a constant vector CONSTRUCTOR to VECTOR_CST. */ | |
388 | unsigned i; | |
389 | tree val; | |
390 | ||
391 | FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (rhs), i, val) | |
392 | if (TREE_CODE (val) != INTEGER_CST | |
393 | && TREE_CODE (val) != REAL_CST | |
394 | && TREE_CODE (val) != FIXED_CST) | |
395 | return NULL_TREE; | |
396 | ||
397 | return build_vector_from_ctor (TREE_TYPE (rhs), | |
398 | CONSTRUCTOR_ELTS (rhs)); | |
399 | } | |
400 | ||
401 | else if (DECL_P (rhs)) | |
9d60be38 | 402 | return get_symbol_constant_value (rhs); |
cbdd87d4 RG |
403 | |
404 | /* If we couldn't fold the RHS, hand over to the generic | |
405 | fold routines. */ | |
406 | if (result == NULL_TREE) | |
407 | result = fold (rhs); | |
408 | ||
409 | /* Strip away useless type conversions. Both the NON_LVALUE_EXPR | |
410 | that may have been added by fold, and "useless" type | |
411 | conversions that might now be apparent due to propagation. */ | |
412 | STRIP_USELESS_TYPE_CONVERSION (result); | |
413 | ||
414 | if (result != rhs && valid_gimple_rhs_p (result)) | |
415 | return result; | |
416 | ||
417 | return NULL_TREE; | |
418 | } | |
419 | break; | |
420 | ||
421 | case GIMPLE_UNARY_RHS: | |
cbdd87d4 RG |
422 | break; |
423 | ||
424 | case GIMPLE_BINARY_RHS: | |
9b80d091 KT |
425 | /* Try to canonicalize for boolean-typed X the comparisons |
426 | X == 0, X == 1, X != 0, and X != 1. */ | |
315f5f1b RG |
427 | if (gimple_assign_rhs_code (stmt) == EQ_EXPR |
428 | || gimple_assign_rhs_code (stmt) == NE_EXPR) | |
9b80d091 KT |
429 | { |
430 | tree lhs = gimple_assign_lhs (stmt); | |
431 | tree op1 = gimple_assign_rhs1 (stmt); | |
432 | tree op2 = gimple_assign_rhs2 (stmt); | |
433 | tree type = TREE_TYPE (op1); | |
434 | ||
435 | /* Check whether the comparison operands are of the same boolean | |
436 | type as the result type is. | |
437 | Check that second operand is an integer-constant with value | |
438 | one or zero. */ | |
439 | if (TREE_CODE (op2) == INTEGER_CST | |
440 | && (integer_zerop (op2) || integer_onep (op2)) | |
441 | && useless_type_conversion_p (TREE_TYPE (lhs), type)) | |
442 | { | |
443 | enum tree_code cmp_code = gimple_assign_rhs_code (stmt); | |
444 | bool is_logical_not = false; | |
445 | ||
446 | /* X == 0 and X != 1 is a logical-not.of X | |
447 | X == 1 and X != 0 is X */ | |
448 | if ((cmp_code == EQ_EXPR && integer_zerop (op2)) | |
449 | || (cmp_code == NE_EXPR && integer_onep (op2))) | |
450 | is_logical_not = true; | |
451 | ||
452 | if (is_logical_not == false) | |
453 | result = op1; | |
454 | /* Only for one-bit precision typed X the transformation | |
455 | !X -> ~X is valied. */ | |
456 | else if (TYPE_PRECISION (type) == 1) | |
457 | result = build1_loc (gimple_location (stmt), BIT_NOT_EXPR, | |
458 | type, op1); | |
459 | /* Otherwise we use !X -> X ^ 1. */ | |
460 | else | |
461 | result = build2_loc (gimple_location (stmt), BIT_XOR_EXPR, | |
462 | type, op1, build_int_cst (type, 1)); | |
463 | ||
464 | } | |
465 | } | |
cbdd87d4 RG |
466 | |
467 | if (!result) | |
468 | result = fold_binary_loc (loc, subcode, | |
5fbcc0ed RG |
469 | TREE_TYPE (gimple_assign_lhs (stmt)), |
470 | gimple_assign_rhs1 (stmt), | |
471 | gimple_assign_rhs2 (stmt)); | |
cbdd87d4 RG |
472 | |
473 | if (result) | |
474 | { | |
475 | STRIP_USELESS_TYPE_CONVERSION (result); | |
476 | if (valid_gimple_rhs_p (result)) | |
477 | return result; | |
cbdd87d4 RG |
478 | } |
479 | break; | |
480 | ||
0354c0c7 | 481 | case GIMPLE_TERNARY_RHS: |
4e71066d RG |
482 | /* Try to fold a conditional expression. */ |
483 | if (gimple_assign_rhs_code (stmt) == COND_EXPR) | |
484 | { | |
485 | tree op0 = gimple_assign_rhs1 (stmt); | |
486 | tree tem; | |
487 | bool set = false; | |
488 | location_t cond_loc = gimple_location (stmt); | |
489 | ||
490 | if (COMPARISON_CLASS_P (op0)) | |
491 | { | |
492 | fold_defer_overflow_warnings (); | |
493 | tem = fold_binary_loc (cond_loc, | |
494 | TREE_CODE (op0), TREE_TYPE (op0), | |
495 | TREE_OPERAND (op0, 0), | |
496 | TREE_OPERAND (op0, 1)); | |
497 | /* This is actually a conditional expression, not a GIMPLE | |
498 | conditional statement, however, the valid_gimple_rhs_p | |
499 | test still applies. */ | |
500 | set = (tem && is_gimple_condexpr (tem) | |
501 | && valid_gimple_rhs_p (tem)); | |
502 | fold_undefer_overflow_warnings (set, stmt, 0); | |
503 | } | |
504 | else if (is_gimple_min_invariant (op0)) | |
505 | { | |
506 | tem = op0; | |
507 | set = true; | |
508 | } | |
509 | else | |
510 | return NULL_TREE; | |
511 | ||
512 | if (set) | |
513 | result = fold_build3_loc (cond_loc, COND_EXPR, | |
514 | TREE_TYPE (gimple_assign_lhs (stmt)), tem, | |
515 | gimple_assign_rhs2 (stmt), | |
516 | gimple_assign_rhs3 (stmt)); | |
517 | } | |
518 | ||
519 | if (!result) | |
520 | result = fold_ternary_loc (loc, subcode, | |
521 | TREE_TYPE (gimple_assign_lhs (stmt)), | |
522 | gimple_assign_rhs1 (stmt), | |
523 | gimple_assign_rhs2 (stmt), | |
524 | gimple_assign_rhs3 (stmt)); | |
0354c0c7 BS |
525 | |
526 | if (result) | |
527 | { | |
528 | STRIP_USELESS_TYPE_CONVERSION (result); | |
529 | if (valid_gimple_rhs_p (result)) | |
530 | return result; | |
0354c0c7 BS |
531 | } |
532 | break; | |
533 | ||
cbdd87d4 RG |
534 | case GIMPLE_INVALID_RHS: |
535 | gcc_unreachable (); | |
536 | } | |
537 | ||
538 | return NULL_TREE; | |
539 | } | |
540 | ||
541 | /* Attempt to fold a conditional statement. Return true if any changes were | |
542 | made. We only attempt to fold the condition expression, and do not perform | |
543 | any transformation that would require alteration of the cfg. It is | |
544 | assumed that the operands have been previously folded. */ | |
545 | ||
546 | static bool | |
538dd0b7 | 547 | fold_gimple_cond (gcond *stmt) |
cbdd87d4 RG |
548 | { |
549 | tree result = fold_binary_loc (gimple_location (stmt), | |
550 | gimple_cond_code (stmt), | |
551 | boolean_type_node, | |
552 | gimple_cond_lhs (stmt), | |
553 | gimple_cond_rhs (stmt)); | |
554 | ||
555 | if (result) | |
556 | { | |
557 | STRIP_USELESS_TYPE_CONVERSION (result); | |
558 | if (is_gimple_condexpr (result) && valid_gimple_rhs_p (result)) | |
559 | { | |
560 | gimple_cond_set_condition_from_tree (stmt, result); | |
561 | return true; | |
562 | } | |
563 | } | |
564 | ||
565 | return false; | |
566 | } | |
567 | ||
fef5a0d9 RB |
568 | |
569 | /* Replace a statement at *SI_P with a sequence of statements in STMTS, | |
570 | adjusting the replacement stmts location and virtual operands. | |
571 | If the statement has a lhs the last stmt in the sequence is expected | |
572 | to assign to that lhs. */ | |
573 | ||
574 | static void | |
575 | gsi_replace_with_seq_vops (gimple_stmt_iterator *si_p, gimple_seq stmts) | |
576 | { | |
577 | gimple stmt = gsi_stmt (*si_p); | |
578 | ||
579 | if (gimple_has_location (stmt)) | |
580 | annotate_all_with_location (stmts, gimple_location (stmt)); | |
581 | ||
582 | /* First iterate over the replacement statements backward, assigning | |
583 | virtual operands to their defining statements. */ | |
584 | gimple laststore = NULL; | |
585 | for (gimple_stmt_iterator i = gsi_last (stmts); | |
586 | !gsi_end_p (i); gsi_prev (&i)) | |
587 | { | |
588 | gimple new_stmt = gsi_stmt (i); | |
589 | if ((gimple_assign_single_p (new_stmt) | |
590 | && !is_gimple_reg (gimple_assign_lhs (new_stmt))) | |
591 | || (is_gimple_call (new_stmt) | |
592 | && (gimple_call_flags (new_stmt) | |
593 | & (ECF_NOVOPS | ECF_PURE | ECF_CONST | ECF_NORETURN)) == 0)) | |
594 | { | |
595 | tree vdef; | |
596 | if (!laststore) | |
597 | vdef = gimple_vdef (stmt); | |
598 | else | |
599 | vdef = make_ssa_name (gimple_vop (cfun), new_stmt); | |
600 | gimple_set_vdef (new_stmt, vdef); | |
601 | if (vdef && TREE_CODE (vdef) == SSA_NAME) | |
602 | SSA_NAME_DEF_STMT (vdef) = new_stmt; | |
603 | laststore = new_stmt; | |
604 | } | |
605 | } | |
606 | ||
607 | /* Second iterate over the statements forward, assigning virtual | |
608 | operands to their uses. */ | |
609 | tree reaching_vuse = gimple_vuse (stmt); | |
610 | for (gimple_stmt_iterator i = gsi_start (stmts); | |
611 | !gsi_end_p (i); gsi_next (&i)) | |
612 | { | |
613 | gimple new_stmt = gsi_stmt (i); | |
614 | /* If the new statement possibly has a VUSE, update it with exact SSA | |
615 | name we know will reach this one. */ | |
616 | if (gimple_has_mem_ops (new_stmt)) | |
617 | gimple_set_vuse (new_stmt, reaching_vuse); | |
618 | gimple_set_modified (new_stmt, true); | |
619 | if (gimple_vdef (new_stmt)) | |
620 | reaching_vuse = gimple_vdef (new_stmt); | |
621 | } | |
622 | ||
623 | /* If the new sequence does not do a store release the virtual | |
624 | definition of the original statement. */ | |
625 | if (reaching_vuse | |
626 | && reaching_vuse == gimple_vuse (stmt)) | |
627 | { | |
628 | tree vdef = gimple_vdef (stmt); | |
629 | if (vdef | |
630 | && TREE_CODE (vdef) == SSA_NAME) | |
631 | { | |
632 | unlink_stmt_vdef (stmt); | |
633 | release_ssa_name (vdef); | |
634 | } | |
635 | } | |
636 | ||
637 | /* Finally replace the original statement with the sequence. */ | |
638 | gsi_replace_with_seq (si_p, stmts, false); | |
639 | } | |
640 | ||
cbdd87d4 RG |
641 | /* Convert EXPR into a GIMPLE value suitable for substitution on the |
642 | RHS of an assignment. Insert the necessary statements before | |
643 | iterator *SI_P. The statement at *SI_P, which must be a GIMPLE_CALL | |
644 | is replaced. If the call is expected to produces a result, then it | |
645 | is replaced by an assignment of the new RHS to the result variable. | |
646 | If the result is to be ignored, then the call is replaced by a | |
fe2ef088 MM |
647 | GIMPLE_NOP. A proper VDEF chain is retained by making the first |
648 | VUSE and the last VDEF of the whole sequence be the same as the replaced | |
649 | statement and using new SSA names for stores in between. */ | |
cbdd87d4 RG |
650 | |
651 | void | |
652 | gimplify_and_update_call_from_tree (gimple_stmt_iterator *si_p, tree expr) | |
653 | { | |
654 | tree lhs; | |
cbdd87d4 RG |
655 | gimple stmt, new_stmt; |
656 | gimple_stmt_iterator i; | |
355a7673 | 657 | gimple_seq stmts = NULL; |
cbdd87d4 RG |
658 | |
659 | stmt = gsi_stmt (*si_p); | |
660 | ||
661 | gcc_assert (is_gimple_call (stmt)); | |
662 | ||
45852dcc | 663 | push_gimplify_context (gimple_in_ssa_p (cfun)); |
cbdd87d4 | 664 | |
e256dfce | 665 | lhs = gimple_call_lhs (stmt); |
cbdd87d4 | 666 | if (lhs == NULL_TREE) |
6e572326 RG |
667 | { |
668 | gimplify_and_add (expr, &stmts); | |
669 | /* We can end up with folding a memcpy of an empty class assignment | |
670 | which gets optimized away by C++ gimplification. */ | |
671 | if (gimple_seq_empty_p (stmts)) | |
672 | { | |
9fdc58de | 673 | pop_gimplify_context (NULL); |
6e572326 RG |
674 | if (gimple_in_ssa_p (cfun)) |
675 | { | |
676 | unlink_stmt_vdef (stmt); | |
677 | release_defs (stmt); | |
678 | } | |
77d19c72 | 679 | gsi_replace (si_p, gimple_build_nop (), true); |
6e572326 RG |
680 | return; |
681 | } | |
682 | } | |
cbdd87d4 | 683 | else |
e256dfce RG |
684 | { |
685 | tree tmp = get_initialized_tmp_var (expr, &stmts, NULL); | |
686 | new_stmt = gimple_build_assign (lhs, tmp); | |
687 | i = gsi_last (stmts); | |
688 | gsi_insert_after_without_update (&i, new_stmt, | |
689 | GSI_CONTINUE_LINKING); | |
690 | } | |
cbdd87d4 RG |
691 | |
692 | pop_gimplify_context (NULL); | |
693 | ||
fef5a0d9 RB |
694 | gsi_replace_with_seq_vops (si_p, stmts); |
695 | } | |
cbdd87d4 | 696 | |
fef5a0d9 RB |
697 | |
698 | /* Replace the call at *GSI with the gimple value VAL. */ | |
699 | ||
700 | static void | |
701 | replace_call_with_value (gimple_stmt_iterator *gsi, tree val) | |
702 | { | |
703 | gimple stmt = gsi_stmt (*gsi); | |
704 | tree lhs = gimple_call_lhs (stmt); | |
705 | gimple repl; | |
706 | if (lhs) | |
e256dfce | 707 | { |
fef5a0d9 RB |
708 | if (!useless_type_conversion_p (TREE_TYPE (lhs), TREE_TYPE (val))) |
709 | val = fold_convert (TREE_TYPE (lhs), val); | |
710 | repl = gimple_build_assign (lhs, val); | |
711 | } | |
712 | else | |
713 | repl = gimple_build_nop (); | |
714 | tree vdef = gimple_vdef (stmt); | |
715 | if (vdef && TREE_CODE (vdef) == SSA_NAME) | |
716 | { | |
717 | unlink_stmt_vdef (stmt); | |
718 | release_ssa_name (vdef); | |
719 | } | |
720 | gsi_replace (gsi, repl, true); | |
721 | } | |
722 | ||
723 | /* Replace the call at *GSI with the new call REPL and fold that | |
724 | again. */ | |
725 | ||
726 | static void | |
727 | replace_call_with_call_and_fold (gimple_stmt_iterator *gsi, gimple repl) | |
728 | { | |
729 | gimple stmt = gsi_stmt (*gsi); | |
730 | gimple_call_set_lhs (repl, gimple_call_lhs (stmt)); | |
731 | gimple_set_location (repl, gimple_location (stmt)); | |
732 | if (gimple_vdef (stmt) | |
733 | && TREE_CODE (gimple_vdef (stmt)) == SSA_NAME) | |
734 | { | |
735 | gimple_set_vdef (repl, gimple_vdef (stmt)); | |
736 | gimple_set_vuse (repl, gimple_vuse (stmt)); | |
737 | SSA_NAME_DEF_STMT (gimple_vdef (repl)) = repl; | |
738 | } | |
739 | gsi_replace (gsi, repl, true); | |
740 | fold_stmt (gsi); | |
741 | } | |
742 | ||
743 | /* Return true if VAR is a VAR_DECL or a component thereof. */ | |
744 | ||
745 | static bool | |
746 | var_decl_component_p (tree var) | |
747 | { | |
748 | tree inner = var; | |
749 | while (handled_component_p (inner)) | |
750 | inner = TREE_OPERAND (inner, 0); | |
751 | return SSA_VAR_P (inner); | |
752 | } | |
753 | ||
754 | /* Fold function call to builtin mem{{,p}cpy,move}. Return | |
755 | NULL_TREE if no simplification can be made. | |
756 | If ENDP is 0, return DEST (like memcpy). | |
757 | If ENDP is 1, return DEST+LEN (like mempcpy). | |
758 | If ENDP is 2, return DEST+LEN-1 (like stpcpy). | |
759 | If ENDP is 3, return DEST, additionally *SRC and *DEST may overlap | |
760 | (memmove). */ | |
761 | ||
762 | static bool | |
763 | gimple_fold_builtin_memory_op (gimple_stmt_iterator *gsi, | |
764 | tree dest, tree src, int endp) | |
765 | { | |
766 | gimple stmt = gsi_stmt (*gsi); | |
767 | tree lhs = gimple_call_lhs (stmt); | |
768 | tree len = gimple_call_arg (stmt, 2); | |
769 | tree destvar, srcvar; | |
770 | location_t loc = gimple_location (stmt); | |
771 | ||
772 | /* If the LEN parameter is zero, return DEST. */ | |
773 | if (integer_zerop (len)) | |
774 | { | |
775 | gimple repl; | |
776 | if (gimple_call_lhs (stmt)) | |
777 | repl = gimple_build_assign (gimple_call_lhs (stmt), dest); | |
778 | else | |
779 | repl = gimple_build_nop (); | |
780 | tree vdef = gimple_vdef (stmt); | |
781 | if (vdef && TREE_CODE (vdef) == SSA_NAME) | |
e256dfce | 782 | { |
fef5a0d9 RB |
783 | unlink_stmt_vdef (stmt); |
784 | release_ssa_name (vdef); | |
785 | } | |
786 | gsi_replace (gsi, repl, true); | |
787 | return true; | |
788 | } | |
789 | ||
790 | /* If SRC and DEST are the same (and not volatile), return | |
791 | DEST{,+LEN,+LEN-1}. */ | |
792 | if (operand_equal_p (src, dest, 0)) | |
793 | { | |
794 | unlink_stmt_vdef (stmt); | |
795 | if (gimple_vdef (stmt) && TREE_CODE (gimple_vdef (stmt)) == SSA_NAME) | |
796 | release_ssa_name (gimple_vdef (stmt)); | |
797 | if (!lhs) | |
798 | { | |
799 | gsi_replace (gsi, gimple_build_nop (), true); | |
800 | return true; | |
801 | } | |
802 | goto done; | |
803 | } | |
804 | else | |
805 | { | |
806 | tree srctype, desttype; | |
807 | unsigned int src_align, dest_align; | |
808 | tree off0; | |
809 | ||
810 | /* Build accesses at offset zero with a ref-all character type. */ | |
811 | off0 = build_int_cst (build_pointer_type_for_mode (char_type_node, | |
812 | ptr_mode, true), 0); | |
813 | ||
814 | /* If we can perform the copy efficiently with first doing all loads | |
815 | and then all stores inline it that way. Currently efficiently | |
816 | means that we can load all the memory into a single integer | |
817 | register which is what MOVE_MAX gives us. */ | |
818 | src_align = get_pointer_alignment (src); | |
819 | dest_align = get_pointer_alignment (dest); | |
820 | if (tree_fits_uhwi_p (len) | |
821 | && compare_tree_int (len, MOVE_MAX) <= 0 | |
822 | /* ??? Don't transform copies from strings with known length this | |
823 | confuses the tree-ssa-strlen.c. This doesn't handle | |
824 | the case in gcc.dg/strlenopt-8.c which is XFAILed for that | |
825 | reason. */ | |
826 | && !c_strlen (src, 2)) | |
827 | { | |
828 | unsigned ilen = tree_to_uhwi (len); | |
829 | if (exact_log2 (ilen) != -1) | |
830 | { | |
831 | tree type = lang_hooks.types.type_for_size (ilen * 8, 1); | |
832 | if (type | |
833 | && TYPE_MODE (type) != BLKmode | |
834 | && (GET_MODE_SIZE (TYPE_MODE (type)) * BITS_PER_UNIT | |
835 | == ilen * 8) | |
836 | /* If the destination pointer is not aligned we must be able | |
837 | to emit an unaligned store. */ | |
838 | && (dest_align >= GET_MODE_ALIGNMENT (TYPE_MODE (type)) | |
839 | || !SLOW_UNALIGNED_ACCESS (TYPE_MODE (type), dest_align))) | |
840 | { | |
841 | tree srctype = type; | |
842 | tree desttype = type; | |
843 | if (src_align < GET_MODE_ALIGNMENT (TYPE_MODE (type))) | |
844 | srctype = build_aligned_type (type, src_align); | |
845 | tree srcmem = fold_build2 (MEM_REF, srctype, src, off0); | |
846 | tree tem = fold_const_aggregate_ref (srcmem); | |
847 | if (tem) | |
848 | srcmem = tem; | |
849 | else if (src_align < GET_MODE_ALIGNMENT (TYPE_MODE (type)) | |
850 | && SLOW_UNALIGNED_ACCESS (TYPE_MODE (type), | |
851 | src_align)) | |
852 | srcmem = NULL_TREE; | |
853 | if (srcmem) | |
854 | { | |
855 | gimple new_stmt; | |
856 | if (is_gimple_reg_type (TREE_TYPE (srcmem))) | |
857 | { | |
858 | new_stmt = gimple_build_assign (NULL_TREE, srcmem); | |
859 | if (gimple_in_ssa_p (cfun)) | |
860 | srcmem = make_ssa_name (TREE_TYPE (srcmem), | |
861 | new_stmt); | |
862 | else | |
b731b390 | 863 | srcmem = create_tmp_reg (TREE_TYPE (srcmem)); |
fef5a0d9 RB |
864 | gimple_assign_set_lhs (new_stmt, srcmem); |
865 | gimple_set_vuse (new_stmt, gimple_vuse (stmt)); | |
866 | gsi_insert_before (gsi, new_stmt, GSI_SAME_STMT); | |
867 | } | |
868 | if (dest_align < GET_MODE_ALIGNMENT (TYPE_MODE (type))) | |
869 | desttype = build_aligned_type (type, dest_align); | |
870 | new_stmt | |
871 | = gimple_build_assign (fold_build2 (MEM_REF, desttype, | |
872 | dest, off0), | |
873 | srcmem); | |
874 | gimple_set_vuse (new_stmt, gimple_vuse (stmt)); | |
875 | gimple_set_vdef (new_stmt, gimple_vdef (stmt)); | |
876 | if (gimple_vdef (new_stmt) | |
877 | && TREE_CODE (gimple_vdef (new_stmt)) == SSA_NAME) | |
878 | SSA_NAME_DEF_STMT (gimple_vdef (new_stmt)) = new_stmt; | |
879 | if (!lhs) | |
880 | { | |
881 | gsi_replace (gsi, new_stmt, true); | |
882 | return true; | |
883 | } | |
884 | gsi_insert_before (gsi, new_stmt, GSI_SAME_STMT); | |
885 | goto done; | |
886 | } | |
887 | } | |
888 | } | |
889 | } | |
890 | ||
891 | if (endp == 3) | |
892 | { | |
893 | /* Both DEST and SRC must be pointer types. | |
894 | ??? This is what old code did. Is the testing for pointer types | |
895 | really mandatory? | |
896 | ||
897 | If either SRC is readonly or length is 1, we can use memcpy. */ | |
898 | if (!dest_align || !src_align) | |
899 | return false; | |
900 | if (readonly_data_expr (src) | |
901 | || (tree_fits_uhwi_p (len) | |
902 | && (MIN (src_align, dest_align) / BITS_PER_UNIT | |
903 | >= tree_to_uhwi (len)))) | |
904 | { | |
905 | tree fn = builtin_decl_implicit (BUILT_IN_MEMCPY); | |
906 | if (!fn) | |
907 | return false; | |
908 | gimple_call_set_fndecl (stmt, fn); | |
909 | gimple_call_set_arg (stmt, 0, dest); | |
910 | gimple_call_set_arg (stmt, 1, src); | |
911 | fold_stmt (gsi); | |
912 | return true; | |
913 | } | |
914 | ||
915 | /* If *src and *dest can't overlap, optimize into memcpy as well. */ | |
916 | if (TREE_CODE (src) == ADDR_EXPR | |
917 | && TREE_CODE (dest) == ADDR_EXPR) | |
918 | { | |
919 | tree src_base, dest_base, fn; | |
920 | HOST_WIDE_INT src_offset = 0, dest_offset = 0; | |
921 | HOST_WIDE_INT size = -1; | |
922 | HOST_WIDE_INT maxsize = -1; | |
923 | ||
924 | srcvar = TREE_OPERAND (src, 0); | |
925 | src_base = get_ref_base_and_extent (srcvar, &src_offset, | |
926 | &size, &maxsize); | |
927 | destvar = TREE_OPERAND (dest, 0); | |
928 | dest_base = get_ref_base_and_extent (destvar, &dest_offset, | |
929 | &size, &maxsize); | |
930 | if (tree_fits_uhwi_p (len)) | |
931 | maxsize = tree_to_uhwi (len); | |
932 | else | |
933 | maxsize = -1; | |
934 | src_offset /= BITS_PER_UNIT; | |
935 | dest_offset /= BITS_PER_UNIT; | |
936 | if (SSA_VAR_P (src_base) | |
937 | && SSA_VAR_P (dest_base)) | |
938 | { | |
939 | if (operand_equal_p (src_base, dest_base, 0) | |
940 | && ranges_overlap_p (src_offset, maxsize, | |
941 | dest_offset, maxsize)) | |
942 | return false; | |
943 | } | |
944 | else if (TREE_CODE (src_base) == MEM_REF | |
945 | && TREE_CODE (dest_base) == MEM_REF) | |
946 | { | |
947 | if (! operand_equal_p (TREE_OPERAND (src_base, 0), | |
948 | TREE_OPERAND (dest_base, 0), 0)) | |
949 | return false; | |
950 | offset_int off = mem_ref_offset (src_base) + src_offset; | |
951 | if (!wi::fits_shwi_p (off)) | |
952 | return false; | |
953 | src_offset = off.to_shwi (); | |
954 | ||
955 | off = mem_ref_offset (dest_base) + dest_offset; | |
956 | if (!wi::fits_shwi_p (off)) | |
957 | return false; | |
958 | dest_offset = off.to_shwi (); | |
959 | if (ranges_overlap_p (src_offset, maxsize, | |
960 | dest_offset, maxsize)) | |
961 | return false; | |
962 | } | |
963 | else | |
964 | return false; | |
965 | ||
966 | fn = builtin_decl_implicit (BUILT_IN_MEMCPY); | |
967 | if (!fn) | |
968 | return false; | |
969 | gimple_call_set_fndecl (stmt, fn); | |
970 | gimple_call_set_arg (stmt, 0, dest); | |
971 | gimple_call_set_arg (stmt, 1, src); | |
972 | fold_stmt (gsi); | |
973 | return true; | |
974 | } | |
975 | ||
976 | /* If the destination and source do not alias optimize into | |
977 | memcpy as well. */ | |
978 | if ((is_gimple_min_invariant (dest) | |
979 | || TREE_CODE (dest) == SSA_NAME) | |
980 | && (is_gimple_min_invariant (src) | |
981 | || TREE_CODE (src) == SSA_NAME)) | |
982 | { | |
983 | ao_ref destr, srcr; | |
984 | ao_ref_init_from_ptr_and_size (&destr, dest, len); | |
985 | ao_ref_init_from_ptr_and_size (&srcr, src, len); | |
986 | if (!refs_may_alias_p_1 (&destr, &srcr, false)) | |
987 | { | |
988 | tree fn; | |
989 | fn = builtin_decl_implicit (BUILT_IN_MEMCPY); | |
990 | if (!fn) | |
991 | return false; | |
992 | gimple_call_set_fndecl (stmt, fn); | |
993 | gimple_call_set_arg (stmt, 0, dest); | |
994 | gimple_call_set_arg (stmt, 1, src); | |
995 | fold_stmt (gsi); | |
996 | return true; | |
997 | } | |
998 | } | |
999 | ||
1000 | return false; | |
1001 | } | |
1002 | ||
1003 | if (!tree_fits_shwi_p (len)) | |
1004 | return false; | |
1005 | /* FIXME: | |
1006 | This logic lose for arguments like (type *)malloc (sizeof (type)), | |
1007 | since we strip the casts of up to VOID return value from malloc. | |
1008 | Perhaps we ought to inherit type from non-VOID argument here? */ | |
1009 | STRIP_NOPS (src); | |
1010 | STRIP_NOPS (dest); | |
1011 | if (!POINTER_TYPE_P (TREE_TYPE (src)) | |
1012 | || !POINTER_TYPE_P (TREE_TYPE (dest))) | |
1013 | return false; | |
1014 | /* In the following try to find a type that is most natural to be | |
1015 | used for the memcpy source and destination and that allows | |
1016 | the most optimization when memcpy is turned into a plain assignment | |
1017 | using that type. In theory we could always use a char[len] type | |
1018 | but that only gains us that the destination and source possibly | |
1019 | no longer will have their address taken. */ | |
1020 | /* As we fold (void *)(p + CST) to (void *)p + CST undo this here. */ | |
1021 | if (TREE_CODE (src) == POINTER_PLUS_EXPR) | |
1022 | { | |
1023 | tree tem = TREE_OPERAND (src, 0); | |
1024 | STRIP_NOPS (tem); | |
1025 | if (tem != TREE_OPERAND (src, 0)) | |
1026 | src = build1 (NOP_EXPR, TREE_TYPE (tem), src); | |
1027 | } | |
1028 | if (TREE_CODE (dest) == POINTER_PLUS_EXPR) | |
1029 | { | |
1030 | tree tem = TREE_OPERAND (dest, 0); | |
1031 | STRIP_NOPS (tem); | |
1032 | if (tem != TREE_OPERAND (dest, 0)) | |
1033 | dest = build1 (NOP_EXPR, TREE_TYPE (tem), dest); | |
1034 | } | |
1035 | srctype = TREE_TYPE (TREE_TYPE (src)); | |
1036 | if (TREE_CODE (srctype) == ARRAY_TYPE | |
1037 | && !tree_int_cst_equal (TYPE_SIZE_UNIT (srctype), len)) | |
1038 | { | |
1039 | srctype = TREE_TYPE (srctype); | |
1040 | STRIP_NOPS (src); | |
1041 | src = build1 (NOP_EXPR, build_pointer_type (srctype), src); | |
1042 | } | |
1043 | desttype = TREE_TYPE (TREE_TYPE (dest)); | |
1044 | if (TREE_CODE (desttype) == ARRAY_TYPE | |
1045 | && !tree_int_cst_equal (TYPE_SIZE_UNIT (desttype), len)) | |
1046 | { | |
1047 | desttype = TREE_TYPE (desttype); | |
1048 | STRIP_NOPS (dest); | |
1049 | dest = build1 (NOP_EXPR, build_pointer_type (desttype), dest); | |
1050 | } | |
1051 | if (TREE_ADDRESSABLE (srctype) | |
1052 | || TREE_ADDRESSABLE (desttype)) | |
1053 | return false; | |
1054 | ||
1055 | /* Make sure we are not copying using a floating-point mode or | |
1056 | a type whose size possibly does not match its precision. */ | |
1057 | if (FLOAT_MODE_P (TYPE_MODE (desttype)) | |
1058 | || TREE_CODE (desttype) == BOOLEAN_TYPE | |
1059 | || TREE_CODE (desttype) == ENUMERAL_TYPE) | |
1060 | desttype = bitwise_type_for_mode (TYPE_MODE (desttype)); | |
1061 | if (FLOAT_MODE_P (TYPE_MODE (srctype)) | |
1062 | || TREE_CODE (srctype) == BOOLEAN_TYPE | |
1063 | || TREE_CODE (srctype) == ENUMERAL_TYPE) | |
1064 | srctype = bitwise_type_for_mode (TYPE_MODE (srctype)); | |
1065 | if (!srctype) | |
1066 | srctype = desttype; | |
1067 | if (!desttype) | |
1068 | desttype = srctype; | |
1069 | if (!srctype) | |
1070 | return false; | |
1071 | ||
1072 | src_align = get_pointer_alignment (src); | |
1073 | dest_align = get_pointer_alignment (dest); | |
1074 | if (dest_align < TYPE_ALIGN (desttype) | |
1075 | || src_align < TYPE_ALIGN (srctype)) | |
1076 | return false; | |
1077 | ||
1078 | destvar = dest; | |
1079 | STRIP_NOPS (destvar); | |
1080 | if (TREE_CODE (destvar) == ADDR_EXPR | |
1081 | && var_decl_component_p (TREE_OPERAND (destvar, 0)) | |
1082 | && tree_int_cst_equal (TYPE_SIZE_UNIT (desttype), len)) | |
1083 | destvar = fold_build2 (MEM_REF, desttype, destvar, off0); | |
1084 | else | |
1085 | destvar = NULL_TREE; | |
1086 | ||
1087 | srcvar = src; | |
1088 | STRIP_NOPS (srcvar); | |
1089 | if (TREE_CODE (srcvar) == ADDR_EXPR | |
1090 | && var_decl_component_p (TREE_OPERAND (srcvar, 0)) | |
1091 | && tree_int_cst_equal (TYPE_SIZE_UNIT (srctype), len)) | |
1092 | { | |
1093 | if (!destvar | |
1094 | || src_align >= TYPE_ALIGN (desttype)) | |
1095 | srcvar = fold_build2 (MEM_REF, destvar ? desttype : srctype, | |
1096 | srcvar, off0); | |
1097 | else if (!STRICT_ALIGNMENT) | |
1098 | { | |
1099 | srctype = build_aligned_type (TYPE_MAIN_VARIANT (desttype), | |
1100 | src_align); | |
1101 | srcvar = fold_build2 (MEM_REF, srctype, srcvar, off0); | |
1102 | } | |
e256dfce | 1103 | else |
fef5a0d9 RB |
1104 | srcvar = NULL_TREE; |
1105 | } | |
1106 | else | |
1107 | srcvar = NULL_TREE; | |
1108 | ||
1109 | if (srcvar == NULL_TREE && destvar == NULL_TREE) | |
1110 | return false; | |
1111 | ||
1112 | if (srcvar == NULL_TREE) | |
1113 | { | |
1114 | STRIP_NOPS (src); | |
1115 | if (src_align >= TYPE_ALIGN (desttype)) | |
1116 | srcvar = fold_build2 (MEM_REF, desttype, src, off0); | |
1117 | else | |
1118 | { | |
1119 | if (STRICT_ALIGNMENT) | |
1120 | return false; | |
1121 | srctype = build_aligned_type (TYPE_MAIN_VARIANT (desttype), | |
1122 | src_align); | |
1123 | srcvar = fold_build2 (MEM_REF, srctype, src, off0); | |
1124 | } | |
1125 | } | |
1126 | else if (destvar == NULL_TREE) | |
1127 | { | |
1128 | STRIP_NOPS (dest); | |
1129 | if (dest_align >= TYPE_ALIGN (srctype)) | |
1130 | destvar = fold_build2 (MEM_REF, srctype, dest, off0); | |
1131 | else | |
1132 | { | |
1133 | if (STRICT_ALIGNMENT) | |
1134 | return false; | |
1135 | desttype = build_aligned_type (TYPE_MAIN_VARIANT (srctype), | |
1136 | dest_align); | |
1137 | destvar = fold_build2 (MEM_REF, desttype, dest, off0); | |
1138 | } | |
1139 | } | |
1140 | ||
1141 | gimple new_stmt; | |
1142 | if (is_gimple_reg_type (TREE_TYPE (srcvar))) | |
1143 | { | |
1144 | new_stmt = gimple_build_assign (NULL_TREE, srcvar); | |
1145 | if (gimple_in_ssa_p (cfun)) | |
1146 | srcvar = make_ssa_name (TREE_TYPE (srcvar), new_stmt); | |
1147 | else | |
b731b390 | 1148 | srcvar = create_tmp_reg (TREE_TYPE (srcvar)); |
fef5a0d9 RB |
1149 | gimple_assign_set_lhs (new_stmt, srcvar); |
1150 | gimple_set_vuse (new_stmt, gimple_vuse (stmt)); | |
1151 | gsi_insert_before (gsi, new_stmt, GSI_SAME_STMT); | |
1152 | } | |
1153 | new_stmt = gimple_build_assign (destvar, srcvar); | |
1154 | gimple_set_vuse (new_stmt, gimple_vuse (stmt)); | |
1155 | gimple_set_vdef (new_stmt, gimple_vdef (stmt)); | |
1156 | if (gimple_vdef (new_stmt) | |
1157 | && TREE_CODE (gimple_vdef (new_stmt)) == SSA_NAME) | |
1158 | SSA_NAME_DEF_STMT (gimple_vdef (new_stmt)) = new_stmt; | |
1159 | if (!lhs) | |
1160 | { | |
1161 | gsi_replace (gsi, new_stmt, true); | |
1162 | return true; | |
1163 | } | |
1164 | gsi_insert_before (gsi, new_stmt, GSI_SAME_STMT); | |
1165 | } | |
1166 | ||
1167 | done: | |
1168 | if (endp == 0 || endp == 3) | |
1169 | len = NULL_TREE; | |
1170 | else if (endp == 2) | |
1171 | len = fold_build2_loc (loc, MINUS_EXPR, TREE_TYPE (len), len, | |
1172 | ssize_int (1)); | |
1173 | if (endp == 2 || endp == 1) | |
1174 | dest = fold_build_pointer_plus_loc (loc, dest, len); | |
1175 | ||
1176 | dest = force_gimple_operand_gsi (gsi, dest, false, NULL_TREE, true, | |
1177 | GSI_SAME_STMT); | |
1178 | gimple repl = gimple_build_assign (lhs, dest); | |
1179 | gsi_replace (gsi, repl, true); | |
1180 | return true; | |
1181 | } | |
1182 | ||
1183 | /* Fold function call to builtin memset or bzero at *GSI setting the | |
1184 | memory of size LEN to VAL. Return whether a simplification was made. */ | |
1185 | ||
1186 | static bool | |
1187 | gimple_fold_builtin_memset (gimple_stmt_iterator *gsi, tree c, tree len) | |
1188 | { | |
1189 | gimple stmt = gsi_stmt (*gsi); | |
1190 | tree etype; | |
1191 | unsigned HOST_WIDE_INT length, cval; | |
1192 | ||
1193 | /* If the LEN parameter is zero, return DEST. */ | |
1194 | if (integer_zerop (len)) | |
1195 | { | |
1196 | replace_call_with_value (gsi, gimple_call_arg (stmt, 0)); | |
1197 | return true; | |
1198 | } | |
1199 | ||
1200 | if (! tree_fits_uhwi_p (len)) | |
1201 | return false; | |
1202 | ||
1203 | if (TREE_CODE (c) != INTEGER_CST) | |
1204 | return false; | |
1205 | ||
1206 | tree dest = gimple_call_arg (stmt, 0); | |
1207 | tree var = dest; | |
1208 | if (TREE_CODE (var) != ADDR_EXPR) | |
1209 | return false; | |
1210 | ||
1211 | var = TREE_OPERAND (var, 0); | |
1212 | if (TREE_THIS_VOLATILE (var)) | |
1213 | return false; | |
1214 | ||
1215 | etype = TREE_TYPE (var); | |
1216 | if (TREE_CODE (etype) == ARRAY_TYPE) | |
1217 | etype = TREE_TYPE (etype); | |
1218 | ||
1219 | if (!INTEGRAL_TYPE_P (etype) | |
1220 | && !POINTER_TYPE_P (etype)) | |
1221 | return NULL_TREE; | |
1222 | ||
1223 | if (! var_decl_component_p (var)) | |
1224 | return NULL_TREE; | |
1225 | ||
1226 | length = tree_to_uhwi (len); | |
1227 | if (GET_MODE_SIZE (TYPE_MODE (etype)) != length | |
1228 | || get_pointer_alignment (dest) / BITS_PER_UNIT < length) | |
1229 | return NULL_TREE; | |
1230 | ||
1231 | if (length > HOST_BITS_PER_WIDE_INT / BITS_PER_UNIT) | |
1232 | return NULL_TREE; | |
1233 | ||
1234 | if (integer_zerop (c)) | |
1235 | cval = 0; | |
1236 | else | |
1237 | { | |
1238 | if (CHAR_BIT != 8 || BITS_PER_UNIT != 8 || HOST_BITS_PER_WIDE_INT > 64) | |
1239 | return NULL_TREE; | |
1240 | ||
1241 | cval = TREE_INT_CST_LOW (c); | |
1242 | cval &= 0xff; | |
1243 | cval |= cval << 8; | |
1244 | cval |= cval << 16; | |
1245 | cval |= (cval << 31) << 1; | |
1246 | } | |
1247 | ||
1248 | var = fold_build2 (MEM_REF, etype, dest, build_int_cst (ptr_type_node, 0)); | |
1249 | gimple store = gimple_build_assign (var, build_int_cst_type (etype, cval)); | |
1250 | gimple_set_vuse (store, gimple_vuse (stmt)); | |
1251 | tree vdef = gimple_vdef (stmt); | |
1252 | if (vdef && TREE_CODE (vdef) == SSA_NAME) | |
1253 | { | |
1254 | gimple_set_vdef (store, gimple_vdef (stmt)); | |
1255 | SSA_NAME_DEF_STMT (gimple_vdef (stmt)) = store; | |
1256 | } | |
1257 | gsi_insert_before (gsi, store, GSI_SAME_STMT); | |
1258 | if (gimple_call_lhs (stmt)) | |
1259 | { | |
1260 | gimple asgn = gimple_build_assign (gimple_call_lhs (stmt), dest); | |
1261 | gsi_replace (gsi, asgn, true); | |
1262 | } | |
1263 | else | |
1264 | { | |
1265 | gimple_stmt_iterator gsi2 = *gsi; | |
1266 | gsi_prev (gsi); | |
1267 | gsi_remove (&gsi2, true); | |
1268 | } | |
1269 | ||
1270 | return true; | |
1271 | } | |
1272 | ||
1273 | ||
1274 | /* Return the string length, maximum string length or maximum value of | |
1275 | ARG in LENGTH. | |
1276 | If ARG is an SSA name variable, follow its use-def chains. If LENGTH | |
1277 | is not NULL and, for TYPE == 0, its value is not equal to the length | |
1278 | we determine or if we are unable to determine the length or value, | |
1279 | return false. VISITED is a bitmap of visited variables. | |
1280 | TYPE is 0 if string length should be returned, 1 for maximum string | |
1281 | length and 2 for maximum value ARG can have. */ | |
1282 | ||
1283 | static bool | |
dcb7fae2 | 1284 | get_maxval_strlen (tree arg, tree *length, bitmap *visited, int type) |
fef5a0d9 RB |
1285 | { |
1286 | tree var, val; | |
1287 | gimple def_stmt; | |
1288 | ||
1289 | if (TREE_CODE (arg) != SSA_NAME) | |
1290 | { | |
1291 | /* We can end up with &(*iftmp_1)[0] here as well, so handle it. */ | |
1292 | if (TREE_CODE (arg) == ADDR_EXPR | |
1293 | && TREE_CODE (TREE_OPERAND (arg, 0)) == ARRAY_REF | |
1294 | && integer_zerop (TREE_OPERAND (TREE_OPERAND (arg, 0), 1))) | |
1295 | { | |
1296 | tree aop0 = TREE_OPERAND (TREE_OPERAND (arg, 0), 0); | |
1297 | if (TREE_CODE (aop0) == INDIRECT_REF | |
1298 | && TREE_CODE (TREE_OPERAND (aop0, 0)) == SSA_NAME) | |
1299 | return get_maxval_strlen (TREE_OPERAND (aop0, 0), | |
1300 | length, visited, type); | |
1301 | } | |
1302 | ||
1303 | if (type == 2) | |
1304 | { | |
1305 | val = arg; | |
1306 | if (TREE_CODE (val) != INTEGER_CST | |
1307 | || tree_int_cst_sgn (val) < 0) | |
1308 | return false; | |
1309 | } | |
1310 | else | |
1311 | val = c_strlen (arg, 1); | |
1312 | if (!val) | |
1313 | return false; | |
1314 | ||
1315 | if (*length) | |
1316 | { | |
1317 | if (type > 0) | |
1318 | { | |
1319 | if (TREE_CODE (*length) != INTEGER_CST | |
1320 | || TREE_CODE (val) != INTEGER_CST) | |
1321 | return false; | |
1322 | ||
1323 | if (tree_int_cst_lt (*length, val)) | |
1324 | *length = val; | |
1325 | return true; | |
1326 | } | |
1327 | else if (simple_cst_equal (val, *length) != 1) | |
1328 | return false; | |
1329 | } | |
1330 | ||
1331 | *length = val; | |
1332 | return true; | |
1333 | } | |
1334 | ||
1335 | /* If ARG is registered for SSA update we cannot look at its defining | |
1336 | statement. */ | |
1337 | if (name_registered_for_update_p (arg)) | |
1338 | return false; | |
1339 | ||
1340 | /* If we were already here, break the infinite cycle. */ | |
dcb7fae2 RB |
1341 | if (!*visited) |
1342 | *visited = BITMAP_ALLOC (NULL); | |
1343 | if (!bitmap_set_bit (*visited, SSA_NAME_VERSION (arg))) | |
fef5a0d9 RB |
1344 | return true; |
1345 | ||
1346 | var = arg; | |
1347 | def_stmt = SSA_NAME_DEF_STMT (var); | |
1348 | ||
1349 | switch (gimple_code (def_stmt)) | |
1350 | { | |
1351 | case GIMPLE_ASSIGN: | |
1352 | /* The RHS of the statement defining VAR must either have a | |
1353 | constant length or come from another SSA_NAME with a constant | |
1354 | length. */ | |
1355 | if (gimple_assign_single_p (def_stmt) | |
1356 | || gimple_assign_unary_nop_p (def_stmt)) | |
1357 | { | |
1358 | tree rhs = gimple_assign_rhs1 (def_stmt); | |
1359 | return get_maxval_strlen (rhs, length, visited, type); | |
1360 | } | |
1361 | else if (gimple_assign_rhs_code (def_stmt) == COND_EXPR) | |
1362 | { | |
1363 | tree op2 = gimple_assign_rhs2 (def_stmt); | |
1364 | tree op3 = gimple_assign_rhs3 (def_stmt); | |
1365 | return get_maxval_strlen (op2, length, visited, type) | |
1366 | && get_maxval_strlen (op3, length, visited, type); | |
1367 | } | |
1368 | return false; | |
1369 | ||
1370 | case GIMPLE_PHI: | |
1371 | { | |
1372 | /* All the arguments of the PHI node must have the same constant | |
1373 | length. */ | |
1374 | unsigned i; | |
1375 | ||
1376 | for (i = 0; i < gimple_phi_num_args (def_stmt); i++) | |
1377 | { | |
1378 | tree arg = gimple_phi_arg (def_stmt, i)->def; | |
1379 | ||
1380 | /* If this PHI has itself as an argument, we cannot | |
1381 | determine the string length of this argument. However, | |
1382 | if we can find a constant string length for the other | |
1383 | PHI args then we can still be sure that this is a | |
1384 | constant string length. So be optimistic and just | |
1385 | continue with the next argument. */ | |
1386 | if (arg == gimple_phi_result (def_stmt)) | |
1387 | continue; | |
1388 | ||
1389 | if (!get_maxval_strlen (arg, length, visited, type)) | |
1390 | return false; | |
1391 | } | |
1392 | } | |
1393 | return true; | |
1394 | ||
1395 | default: | |
1396 | return false; | |
1397 | } | |
1398 | } | |
1399 | ||
dcb7fae2 RB |
1400 | tree |
1401 | get_maxval_strlen (tree arg, int type) | |
1402 | { | |
1403 | bitmap visited = NULL; | |
1404 | tree len = NULL_TREE; | |
1405 | if (!get_maxval_strlen (arg, &len, &visited, type)) | |
1406 | len = NULL_TREE; | |
1407 | if (visited) | |
1408 | BITMAP_FREE (visited); | |
1409 | ||
1410 | return len; | |
1411 | } | |
1412 | ||
fef5a0d9 RB |
1413 | |
1414 | /* Fold function call to builtin strcpy with arguments DEST and SRC. | |
1415 | If LEN is not NULL, it represents the length of the string to be | |
1416 | copied. Return NULL_TREE if no simplification can be made. */ | |
1417 | ||
1418 | static bool | |
1419 | gimple_fold_builtin_strcpy (gimple_stmt_iterator *gsi, | |
dcb7fae2 | 1420 | tree dest, tree src) |
fef5a0d9 | 1421 | { |
dcb7fae2 | 1422 | location_t loc = gimple_location (gsi_stmt (*gsi)); |
fef5a0d9 RB |
1423 | tree fn; |
1424 | ||
1425 | /* If SRC and DEST are the same (and not volatile), return DEST. */ | |
1426 | if (operand_equal_p (src, dest, 0)) | |
1427 | { | |
1428 | replace_call_with_value (gsi, dest); | |
1429 | return true; | |
1430 | } | |
1431 | ||
1432 | if (optimize_function_for_size_p (cfun)) | |
1433 | return false; | |
1434 | ||
1435 | fn = builtin_decl_implicit (BUILT_IN_MEMCPY); | |
1436 | if (!fn) | |
1437 | return false; | |
1438 | ||
1579e1f8 | 1439 | tree len = get_maxval_strlen (src, 0); |
fef5a0d9 | 1440 | if (!len) |
dcb7fae2 | 1441 | return false; |
fef5a0d9 RB |
1442 | |
1443 | len = fold_convert_loc (loc, size_type_node, len); | |
1444 | len = size_binop_loc (loc, PLUS_EXPR, len, build_int_cst (size_type_node, 1)); | |
1445 | len = force_gimple_operand_gsi (gsi, len, true, | |
1446 | NULL_TREE, true, GSI_SAME_STMT); | |
1447 | gimple repl = gimple_build_call (fn, 3, dest, src, len); | |
1448 | replace_call_with_call_and_fold (gsi, repl); | |
1449 | return true; | |
1450 | } | |
1451 | ||
1452 | /* Fold function call to builtin strncpy with arguments DEST, SRC, and LEN. | |
1453 | If SLEN is not NULL, it represents the length of the source string. | |
1454 | Return NULL_TREE if no simplification can be made. */ | |
1455 | ||
1456 | static bool | |
dcb7fae2 RB |
1457 | gimple_fold_builtin_strncpy (gimple_stmt_iterator *gsi, |
1458 | tree dest, tree src, tree len) | |
fef5a0d9 | 1459 | { |
dcb7fae2 | 1460 | location_t loc = gimple_location (gsi_stmt (*gsi)); |
fef5a0d9 RB |
1461 | tree fn; |
1462 | ||
1463 | /* If the LEN parameter is zero, return DEST. */ | |
1464 | if (integer_zerop (len)) | |
1465 | { | |
1466 | replace_call_with_value (gsi, dest); | |
1467 | return true; | |
1468 | } | |
1469 | ||
1470 | /* We can't compare slen with len as constants below if len is not a | |
1471 | constant. */ | |
dcb7fae2 | 1472 | if (TREE_CODE (len) != INTEGER_CST) |
fef5a0d9 RB |
1473 | return false; |
1474 | ||
fef5a0d9 | 1475 | /* Now, we must be passed a constant src ptr parameter. */ |
1579e1f8 | 1476 | tree slen = get_maxval_strlen (src, 0); |
dcb7fae2 | 1477 | if (!slen || TREE_CODE (slen) != INTEGER_CST) |
fef5a0d9 RB |
1478 | return false; |
1479 | ||
1480 | slen = size_binop_loc (loc, PLUS_EXPR, slen, ssize_int (1)); | |
1481 | ||
1482 | /* We do not support simplification of this case, though we do | |
1483 | support it when expanding trees into RTL. */ | |
1484 | /* FIXME: generate a call to __builtin_memset. */ | |
1485 | if (tree_int_cst_lt (slen, len)) | |
1486 | return false; | |
1487 | ||
1488 | /* OK transform into builtin memcpy. */ | |
1489 | fn = builtin_decl_implicit (BUILT_IN_MEMCPY); | |
1490 | if (!fn) | |
1491 | return false; | |
1492 | ||
1493 | len = fold_convert_loc (loc, size_type_node, len); | |
1494 | len = force_gimple_operand_gsi (gsi, len, true, | |
1495 | NULL_TREE, true, GSI_SAME_STMT); | |
1496 | gimple repl = gimple_build_call (fn, 3, dest, src, len); | |
1497 | replace_call_with_call_and_fold (gsi, repl); | |
1498 | return true; | |
1499 | } | |
1500 | ||
1501 | /* Simplify a call to the strcat builtin. DST and SRC are the arguments | |
1502 | to the call. | |
1503 | ||
1504 | Return NULL_TREE if no simplification was possible, otherwise return the | |
1505 | simplified form of the call as a tree. | |
1506 | ||
1507 | The simplified form may be a constant or other expression which | |
1508 | computes the same value, but in a more efficient manner (including | |
1509 | calls to other builtin functions). | |
1510 | ||
1511 | The call may contain arguments which need to be evaluated, but | |
1512 | which are not useful to determine the result of the call. In | |
1513 | this case we return a chain of COMPOUND_EXPRs. The LHS of each | |
1514 | COMPOUND_EXPR will be an argument which must be evaluated. | |
1515 | COMPOUND_EXPRs are chained through their RHS. The RHS of the last | |
1516 | COMPOUND_EXPR in the chain will contain the tree for the simplified | |
1517 | form of the builtin function call. */ | |
1518 | ||
1519 | static bool | |
dcb7fae2 | 1520 | gimple_fold_builtin_strcat (gimple_stmt_iterator *gsi, tree dst, tree src) |
fef5a0d9 RB |
1521 | { |
1522 | gimple stmt = gsi_stmt (*gsi); | |
dcb7fae2 | 1523 | location_t loc = gimple_location (stmt); |
fef5a0d9 RB |
1524 | |
1525 | const char *p = c_getstr (src); | |
1526 | ||
1527 | /* If the string length is zero, return the dst parameter. */ | |
1528 | if (p && *p == '\0') | |
1529 | { | |
1530 | replace_call_with_value (gsi, dst); | |
1531 | return true; | |
1532 | } | |
1533 | ||
1534 | if (!optimize_bb_for_speed_p (gimple_bb (stmt))) | |
1535 | return false; | |
1536 | ||
1537 | /* See if we can store by pieces into (dst + strlen(dst)). */ | |
1538 | tree newdst; | |
1539 | tree strlen_fn = builtin_decl_implicit (BUILT_IN_STRLEN); | |
1540 | tree memcpy_fn = builtin_decl_implicit (BUILT_IN_MEMCPY); | |
1541 | ||
1542 | if (!strlen_fn || !memcpy_fn) | |
1543 | return false; | |
1544 | ||
1545 | /* If the length of the source string isn't computable don't | |
1546 | split strcat into strlen and memcpy. */ | |
dcb7fae2 | 1547 | tree len = get_maxval_strlen (src, 0); |
fef5a0d9 | 1548 | if (! len) |
fef5a0d9 RB |
1549 | return false; |
1550 | ||
1551 | /* Create strlen (dst). */ | |
1552 | gimple_seq stmts = NULL, stmts2; | |
1553 | gimple repl = gimple_build_call (strlen_fn, 1, dst); | |
1554 | gimple_set_location (repl, loc); | |
1555 | if (gimple_in_ssa_p (cfun)) | |
b731b390 | 1556 | newdst = make_ssa_name (size_type_node); |
fef5a0d9 | 1557 | else |
b731b390 | 1558 | newdst = create_tmp_reg (size_type_node); |
fef5a0d9 RB |
1559 | gimple_call_set_lhs (repl, newdst); |
1560 | gimple_seq_add_stmt_without_update (&stmts, repl); | |
1561 | ||
1562 | /* Create (dst p+ strlen (dst)). */ | |
1563 | newdst = fold_build_pointer_plus_loc (loc, dst, newdst); | |
1564 | newdst = force_gimple_operand (newdst, &stmts2, true, NULL_TREE); | |
1565 | gimple_seq_add_seq_without_update (&stmts, stmts2); | |
1566 | ||
1567 | len = fold_convert_loc (loc, size_type_node, len); | |
1568 | len = size_binop_loc (loc, PLUS_EXPR, len, | |
1569 | build_int_cst (size_type_node, 1)); | |
1570 | len = force_gimple_operand (len, &stmts2, true, NULL_TREE); | |
1571 | gimple_seq_add_seq_without_update (&stmts, stmts2); | |
1572 | ||
1573 | repl = gimple_build_call (memcpy_fn, 3, newdst, src, len); | |
1574 | gimple_seq_add_stmt_without_update (&stmts, repl); | |
1575 | if (gimple_call_lhs (stmt)) | |
1576 | { | |
1577 | repl = gimple_build_assign (gimple_call_lhs (stmt), dst); | |
1578 | gimple_seq_add_stmt_without_update (&stmts, repl); | |
1579 | gsi_replace_with_seq_vops (gsi, stmts); | |
1580 | /* gsi now points at the assignment to the lhs, get a | |
1581 | stmt iterator to the memcpy call. | |
1582 | ??? We can't use gsi_for_stmt as that doesn't work when the | |
1583 | CFG isn't built yet. */ | |
1584 | gimple_stmt_iterator gsi2 = *gsi; | |
1585 | gsi_prev (&gsi2); | |
1586 | fold_stmt (&gsi2); | |
1587 | } | |
1588 | else | |
1589 | { | |
1590 | gsi_replace_with_seq_vops (gsi, stmts); | |
1591 | fold_stmt (gsi); | |
1592 | } | |
1593 | return true; | |
1594 | } | |
1595 | ||
07f1cf56 RB |
1596 | /* Fold a call to the __strcat_chk builtin FNDECL. DEST, SRC, and SIZE |
1597 | are the arguments to the call. */ | |
1598 | ||
1599 | static bool | |
1600 | gimple_fold_builtin_strcat_chk (gimple_stmt_iterator *gsi) | |
1601 | { | |
1602 | gimple stmt = gsi_stmt (*gsi); | |
1603 | tree dest = gimple_call_arg (stmt, 0); | |
1604 | tree src = gimple_call_arg (stmt, 1); | |
1605 | tree size = gimple_call_arg (stmt, 2); | |
1606 | tree fn; | |
1607 | const char *p; | |
1608 | ||
1609 | ||
1610 | p = c_getstr (src); | |
1611 | /* If the SRC parameter is "", return DEST. */ | |
1612 | if (p && *p == '\0') | |
1613 | { | |
1614 | replace_call_with_value (gsi, dest); | |
1615 | return true; | |
1616 | } | |
1617 | ||
1618 | if (! tree_fits_uhwi_p (size) || ! integer_all_onesp (size)) | |
1619 | return false; | |
1620 | ||
1621 | /* If __builtin_strcat_chk is used, assume strcat is available. */ | |
1622 | fn = builtin_decl_explicit (BUILT_IN_STRCAT); | |
1623 | if (!fn) | |
1624 | return false; | |
1625 | ||
1626 | gimple repl = gimple_build_call (fn, 2, dest, src); | |
1627 | replace_call_with_call_and_fold (gsi, repl); | |
1628 | return true; | |
1629 | } | |
1630 | ||
ad03a744 RB |
1631 | /* Simplify a call to the strncat builtin. */ |
1632 | ||
1633 | static bool | |
1634 | gimple_fold_builtin_strncat (gimple_stmt_iterator *gsi) | |
1635 | { | |
1636 | gcall *stmt = as_a <gcall *> (gsi_stmt (*gsi)); | |
1637 | tree dst = gimple_call_arg (stmt, 0); | |
1638 | tree src = gimple_call_arg (stmt, 1); | |
1639 | tree len = gimple_call_arg (stmt, 2); | |
1640 | ||
1641 | const char *p = c_getstr (src); | |
1642 | ||
1643 | /* If the requested length is zero, or the src parameter string | |
1644 | length is zero, return the dst parameter. */ | |
1645 | if (integer_zerop (len) || (p && *p == '\0')) | |
1646 | { | |
1647 | replace_call_with_value (gsi, dst); | |
1648 | return true; | |
1649 | } | |
1650 | ||
1651 | /* If the requested len is greater than or equal to the string | |
1652 | length, call strcat. */ | |
1653 | if (TREE_CODE (len) == INTEGER_CST && p | |
1654 | && compare_tree_int (len, strlen (p)) >= 0) | |
1655 | { | |
1656 | tree fn = builtin_decl_implicit (BUILT_IN_STRCAT); | |
1657 | ||
1658 | /* If the replacement _DECL isn't initialized, don't do the | |
1659 | transformation. */ | |
1660 | if (!fn) | |
1661 | return false; | |
1662 | ||
1663 | gcall *repl = gimple_build_call (fn, 2, dst, src); | |
1664 | replace_call_with_call_and_fold (gsi, repl); | |
1665 | return true; | |
1666 | } | |
1667 | ||
1668 | return false; | |
1669 | } | |
1670 | ||
745583f9 RB |
1671 | /* Fold a call to the __strncat_chk builtin with arguments DEST, SRC, |
1672 | LEN, and SIZE. */ | |
1673 | ||
1674 | static bool | |
1675 | gimple_fold_builtin_strncat_chk (gimple_stmt_iterator *gsi) | |
1676 | { | |
1677 | gimple stmt = gsi_stmt (*gsi); | |
1678 | tree dest = gimple_call_arg (stmt, 0); | |
1679 | tree src = gimple_call_arg (stmt, 1); | |
1680 | tree len = gimple_call_arg (stmt, 2); | |
1681 | tree size = gimple_call_arg (stmt, 3); | |
1682 | tree fn; | |
1683 | const char *p; | |
1684 | ||
1685 | p = c_getstr (src); | |
1686 | /* If the SRC parameter is "" or if LEN is 0, return DEST. */ | |
1687 | if ((p && *p == '\0') | |
1688 | || integer_zerop (len)) | |
1689 | { | |
1690 | replace_call_with_value (gsi, dest); | |
1691 | return true; | |
1692 | } | |
1693 | ||
1694 | if (! tree_fits_uhwi_p (size)) | |
1695 | return false; | |
1696 | ||
1697 | if (! integer_all_onesp (size)) | |
1698 | { | |
1699 | tree src_len = c_strlen (src, 1); | |
1700 | if (src_len | |
1701 | && tree_fits_uhwi_p (src_len) | |
1702 | && tree_fits_uhwi_p (len) | |
1703 | && ! tree_int_cst_lt (len, src_len)) | |
1704 | { | |
1705 | /* If LEN >= strlen (SRC), optimize into __strcat_chk. */ | |
1706 | fn = builtin_decl_explicit (BUILT_IN_STRCAT_CHK); | |
1707 | if (!fn) | |
1708 | return false; | |
1709 | ||
1710 | gimple repl = gimple_build_call (fn, 3, dest, src, size); | |
1711 | replace_call_with_call_and_fold (gsi, repl); | |
1712 | return true; | |
1713 | } | |
1714 | return false; | |
1715 | } | |
1716 | ||
1717 | /* If __builtin_strncat_chk is used, assume strncat is available. */ | |
1718 | fn = builtin_decl_explicit (BUILT_IN_STRNCAT); | |
1719 | if (!fn) | |
1720 | return false; | |
1721 | ||
1722 | gimple repl = gimple_build_call (fn, 3, dest, src, len); | |
1723 | replace_call_with_call_and_fold (gsi, repl); | |
1724 | return true; | |
1725 | } | |
1726 | ||
fef5a0d9 RB |
1727 | /* Fold a call to the fputs builtin. ARG0 and ARG1 are the arguments |
1728 | to the call. IGNORE is true if the value returned | |
1729 | by the builtin will be ignored. UNLOCKED is true is true if this | |
1730 | actually a call to fputs_unlocked. If LEN in non-NULL, it represents | |
1731 | the known length of the string. Return NULL_TREE if no simplification | |
1732 | was possible. */ | |
1733 | ||
1734 | static bool | |
1735 | gimple_fold_builtin_fputs (gimple_stmt_iterator *gsi, | |
fef5a0d9 | 1736 | tree arg0, tree arg1, |
dcb7fae2 | 1737 | bool unlocked) |
fef5a0d9 | 1738 | { |
dcb7fae2 RB |
1739 | gimple stmt = gsi_stmt (*gsi); |
1740 | ||
fef5a0d9 RB |
1741 | /* If we're using an unlocked function, assume the other unlocked |
1742 | functions exist explicitly. */ | |
1743 | tree const fn_fputc = (unlocked | |
1744 | ? builtin_decl_explicit (BUILT_IN_FPUTC_UNLOCKED) | |
1745 | : builtin_decl_implicit (BUILT_IN_FPUTC)); | |
1746 | tree const fn_fwrite = (unlocked | |
1747 | ? builtin_decl_explicit (BUILT_IN_FWRITE_UNLOCKED) | |
1748 | : builtin_decl_implicit (BUILT_IN_FWRITE)); | |
1749 | ||
1750 | /* If the return value is used, don't do the transformation. */ | |
dcb7fae2 | 1751 | if (gimple_call_lhs (stmt)) |
fef5a0d9 RB |
1752 | return false; |
1753 | ||
fef5a0d9 RB |
1754 | /* Get the length of the string passed to fputs. If the length |
1755 | can't be determined, punt. */ | |
dcb7fae2 | 1756 | tree len = get_maxval_strlen (arg0, 0); |
fef5a0d9 RB |
1757 | if (!len |
1758 | || TREE_CODE (len) != INTEGER_CST) | |
1759 | return false; | |
1760 | ||
1761 | switch (compare_tree_int (len, 1)) | |
1762 | { | |
1763 | case -1: /* length is 0, delete the call entirely . */ | |
1764 | replace_call_with_value (gsi, integer_zero_node); | |
1765 | return true; | |
1766 | ||
1767 | case 0: /* length is 1, call fputc. */ | |
1768 | { | |
1769 | const char *p = c_getstr (arg0); | |
1770 | if (p != NULL) | |
1771 | { | |
1772 | if (!fn_fputc) | |
1773 | return false; | |
1774 | ||
1775 | gimple repl = gimple_build_call (fn_fputc, 2, | |
1776 | build_int_cst | |
1777 | (integer_type_node, p[0]), arg1); | |
1778 | replace_call_with_call_and_fold (gsi, repl); | |
1779 | return true; | |
1780 | } | |
1781 | } | |
1782 | /* FALLTHROUGH */ | |
1783 | case 1: /* length is greater than 1, call fwrite. */ | |
1784 | { | |
1785 | /* If optimizing for size keep fputs. */ | |
1786 | if (optimize_function_for_size_p (cfun)) | |
1787 | return false; | |
1788 | /* New argument list transforming fputs(string, stream) to | |
1789 | fwrite(string, 1, len, stream). */ | |
1790 | if (!fn_fwrite) | |
1791 | return false; | |
1792 | ||
1793 | gimple repl = gimple_build_call (fn_fwrite, 4, arg0, | |
1794 | size_one_node, len, arg1); | |
1795 | replace_call_with_call_and_fold (gsi, repl); | |
1796 | return true; | |
1797 | } | |
1798 | default: | |
1799 | gcc_unreachable (); | |
1800 | } | |
1801 | return false; | |
1802 | } | |
1803 | ||
1804 | /* Fold a call to the __mem{cpy,pcpy,move,set}_chk builtin. | |
1805 | DEST, SRC, LEN, and SIZE are the arguments to the call. | |
1806 | IGNORE is true, if return value can be ignored. FCODE is the BUILT_IN_* | |
1807 | code of the builtin. If MAXLEN is not NULL, it is maximum length | |
1808 | passed as third argument. */ | |
1809 | ||
1810 | static bool | |
1811 | gimple_fold_builtin_memory_chk (gimple_stmt_iterator *gsi, | |
fef5a0d9 | 1812 | tree dest, tree src, tree len, tree size, |
fef5a0d9 RB |
1813 | enum built_in_function fcode) |
1814 | { | |
dcb7fae2 RB |
1815 | gimple stmt = gsi_stmt (*gsi); |
1816 | location_t loc = gimple_location (stmt); | |
1817 | bool ignore = gimple_call_lhs (stmt) == NULL_TREE; | |
fef5a0d9 RB |
1818 | tree fn; |
1819 | ||
1820 | /* If SRC and DEST are the same (and not volatile), return DEST | |
1821 | (resp. DEST+LEN for __mempcpy_chk). */ | |
1822 | if (fcode != BUILT_IN_MEMSET_CHK && operand_equal_p (src, dest, 0)) | |
1823 | { | |
1824 | if (fcode != BUILT_IN_MEMPCPY_CHK) | |
1825 | { | |
1826 | replace_call_with_value (gsi, dest); | |
1827 | return true; | |
1828 | } | |
1829 | else | |
1830 | { | |
1831 | tree temp = fold_build_pointer_plus_loc (loc, dest, len); | |
1832 | temp = force_gimple_operand_gsi (gsi, temp, | |
1833 | false, NULL_TREE, true, | |
1834 | GSI_SAME_STMT); | |
1835 | replace_call_with_value (gsi, temp); | |
1836 | return true; | |
1837 | } | |
1838 | } | |
1839 | ||
1840 | if (! tree_fits_uhwi_p (size)) | |
1841 | return false; | |
1842 | ||
dcb7fae2 | 1843 | tree maxlen = get_maxval_strlen (len, 2); |
fef5a0d9 RB |
1844 | if (! integer_all_onesp (size)) |
1845 | { | |
1846 | if (! tree_fits_uhwi_p (len)) | |
1847 | { | |
1848 | /* If LEN is not constant, try MAXLEN too. | |
1849 | For MAXLEN only allow optimizing into non-_ocs function | |
1850 | if SIZE is >= MAXLEN, never convert to __ocs_fail (). */ | |
1851 | if (maxlen == NULL_TREE || ! tree_fits_uhwi_p (maxlen)) | |
1852 | { | |
1853 | if (fcode == BUILT_IN_MEMPCPY_CHK && ignore) | |
1854 | { | |
1855 | /* (void) __mempcpy_chk () can be optimized into | |
1856 | (void) __memcpy_chk (). */ | |
1857 | fn = builtin_decl_explicit (BUILT_IN_MEMCPY_CHK); | |
1858 | if (!fn) | |
1859 | return false; | |
1860 | ||
1861 | gimple repl = gimple_build_call (fn, 4, dest, src, len, size); | |
1862 | replace_call_with_call_and_fold (gsi, repl); | |
1863 | return true; | |
1864 | } | |
1865 | return false; | |
1866 | } | |
1867 | } | |
1868 | else | |
1869 | maxlen = len; | |
1870 | ||
1871 | if (tree_int_cst_lt (size, maxlen)) | |
1872 | return false; | |
1873 | } | |
1874 | ||
1875 | fn = NULL_TREE; | |
1876 | /* If __builtin_mem{cpy,pcpy,move,set}_chk is used, assume | |
1877 | mem{cpy,pcpy,move,set} is available. */ | |
1878 | switch (fcode) | |
1879 | { | |
1880 | case BUILT_IN_MEMCPY_CHK: | |
1881 | fn = builtin_decl_explicit (BUILT_IN_MEMCPY); | |
1882 | break; | |
1883 | case BUILT_IN_MEMPCPY_CHK: | |
1884 | fn = builtin_decl_explicit (BUILT_IN_MEMPCPY); | |
1885 | break; | |
1886 | case BUILT_IN_MEMMOVE_CHK: | |
1887 | fn = builtin_decl_explicit (BUILT_IN_MEMMOVE); | |
1888 | break; | |
1889 | case BUILT_IN_MEMSET_CHK: | |
1890 | fn = builtin_decl_explicit (BUILT_IN_MEMSET); | |
1891 | break; | |
1892 | default: | |
1893 | break; | |
1894 | } | |
1895 | ||
1896 | if (!fn) | |
1897 | return false; | |
1898 | ||
1899 | gimple repl = gimple_build_call (fn, 3, dest, src, len); | |
1900 | replace_call_with_call_and_fold (gsi, repl); | |
1901 | return true; | |
1902 | } | |
1903 | ||
1904 | /* Fold a call to the __st[rp]cpy_chk builtin. | |
1905 | DEST, SRC, and SIZE are the arguments to the call. | |
1906 | IGNORE is true if return value can be ignored. FCODE is the BUILT_IN_* | |
1907 | code of the builtin. If MAXLEN is not NULL, it is maximum length of | |
1908 | strings passed as second argument. */ | |
1909 | ||
1910 | static bool | |
1911 | gimple_fold_builtin_stxcpy_chk (gimple_stmt_iterator *gsi, | |
dcb7fae2 | 1912 | tree dest, |
fef5a0d9 | 1913 | tree src, tree size, |
fef5a0d9 RB |
1914 | enum built_in_function fcode) |
1915 | { | |
dcb7fae2 RB |
1916 | gimple stmt = gsi_stmt (*gsi); |
1917 | location_t loc = gimple_location (stmt); | |
1918 | bool ignore = gimple_call_lhs (stmt) == NULL_TREE; | |
fef5a0d9 RB |
1919 | tree len, fn; |
1920 | ||
1921 | /* If SRC and DEST are the same (and not volatile), return DEST. */ | |
1922 | if (fcode == BUILT_IN_STRCPY_CHK && operand_equal_p (src, dest, 0)) | |
1923 | { | |
1924 | replace_call_with_value (gsi, dest); | |
1925 | return true; | |
1926 | } | |
1927 | ||
1928 | if (! tree_fits_uhwi_p (size)) | |
1929 | return false; | |
1930 | ||
dcb7fae2 | 1931 | tree maxlen = get_maxval_strlen (src, 1); |
fef5a0d9 RB |
1932 | if (! integer_all_onesp (size)) |
1933 | { | |
1934 | len = c_strlen (src, 1); | |
1935 | if (! len || ! tree_fits_uhwi_p (len)) | |
1936 | { | |
1937 | /* If LEN is not constant, try MAXLEN too. | |
1938 | For MAXLEN only allow optimizing into non-_ocs function | |
1939 | if SIZE is >= MAXLEN, never convert to __ocs_fail (). */ | |
1940 | if (maxlen == NULL_TREE || ! tree_fits_uhwi_p (maxlen)) | |
1941 | { | |
1942 | if (fcode == BUILT_IN_STPCPY_CHK) | |
1943 | { | |
1944 | if (! ignore) | |
1945 | return false; | |
1946 | ||
1947 | /* If return value of __stpcpy_chk is ignored, | |
1948 | optimize into __strcpy_chk. */ | |
1949 | fn = builtin_decl_explicit (BUILT_IN_STRCPY_CHK); | |
1950 | if (!fn) | |
1951 | return false; | |
1952 | ||
1953 | gimple repl = gimple_build_call (fn, 3, dest, src, size); | |
1954 | replace_call_with_call_and_fold (gsi, repl); | |
1955 | return true; | |
1956 | } | |
1957 | ||
1958 | if (! len || TREE_SIDE_EFFECTS (len)) | |
1959 | return false; | |
1960 | ||
1961 | /* If c_strlen returned something, but not a constant, | |
1962 | transform __strcpy_chk into __memcpy_chk. */ | |
1963 | fn = builtin_decl_explicit (BUILT_IN_MEMCPY_CHK); | |
1964 | if (!fn) | |
1965 | return false; | |
1966 | ||
1967 | len = fold_convert_loc (loc, size_type_node, len); | |
1968 | len = size_binop_loc (loc, PLUS_EXPR, len, | |
1969 | build_int_cst (size_type_node, 1)); | |
1970 | len = force_gimple_operand_gsi (gsi, len, true, NULL_TREE, | |
1971 | true, GSI_SAME_STMT); | |
1972 | gimple repl = gimple_build_call (fn, 4, dest, src, len, size); | |
1973 | replace_call_with_call_and_fold (gsi, repl); | |
1974 | return true; | |
1975 | } | |
e256dfce | 1976 | } |
fef5a0d9 RB |
1977 | else |
1978 | maxlen = len; | |
1979 | ||
1980 | if (! tree_int_cst_lt (maxlen, size)) | |
1981 | return false; | |
e256dfce RG |
1982 | } |
1983 | ||
fef5a0d9 RB |
1984 | /* If __builtin_st{r,p}cpy_chk is used, assume st{r,p}cpy is available. */ |
1985 | fn = builtin_decl_explicit (fcode == BUILT_IN_STPCPY_CHK | |
1986 | ? BUILT_IN_STPCPY : BUILT_IN_STRCPY); | |
1987 | if (!fn) | |
1988 | return false; | |
1989 | ||
1990 | gimple repl = gimple_build_call (fn, 2, dest, src); | |
1991 | replace_call_with_call_and_fold (gsi, repl); | |
1992 | return true; | |
1993 | } | |
1994 | ||
1995 | /* Fold a call to the __st{r,p}ncpy_chk builtin. DEST, SRC, LEN, and SIZE | |
1996 | are the arguments to the call. If MAXLEN is not NULL, it is maximum | |
1997 | length passed as third argument. IGNORE is true if return value can be | |
1998 | ignored. FCODE is the BUILT_IN_* code of the builtin. */ | |
1999 | ||
2000 | static bool | |
2001 | gimple_fold_builtin_stxncpy_chk (gimple_stmt_iterator *gsi, | |
2002 | tree dest, tree src, | |
dcb7fae2 | 2003 | tree len, tree size, |
fef5a0d9 RB |
2004 | enum built_in_function fcode) |
2005 | { | |
dcb7fae2 RB |
2006 | gimple stmt = gsi_stmt (*gsi); |
2007 | bool ignore = gimple_call_lhs (stmt) == NULL_TREE; | |
fef5a0d9 RB |
2008 | tree fn; |
2009 | ||
2010 | if (fcode == BUILT_IN_STPNCPY_CHK && ignore) | |
cbdd87d4 | 2011 | { |
fef5a0d9 RB |
2012 | /* If return value of __stpncpy_chk is ignored, |
2013 | optimize into __strncpy_chk. */ | |
2014 | fn = builtin_decl_explicit (BUILT_IN_STRNCPY_CHK); | |
2015 | if (fn) | |
2016 | { | |
2017 | gimple repl = gimple_build_call (fn, 4, dest, src, len, size); | |
2018 | replace_call_with_call_and_fold (gsi, repl); | |
2019 | return true; | |
2020 | } | |
cbdd87d4 RG |
2021 | } |
2022 | ||
fef5a0d9 RB |
2023 | if (! tree_fits_uhwi_p (size)) |
2024 | return false; | |
2025 | ||
dcb7fae2 | 2026 | tree maxlen = get_maxval_strlen (len, 2); |
fef5a0d9 | 2027 | if (! integer_all_onesp (size)) |
cbdd87d4 | 2028 | { |
fef5a0d9 | 2029 | if (! tree_fits_uhwi_p (len)) |
fe2ef088 | 2030 | { |
fef5a0d9 RB |
2031 | /* If LEN is not constant, try MAXLEN too. |
2032 | For MAXLEN only allow optimizing into non-_ocs function | |
2033 | if SIZE is >= MAXLEN, never convert to __ocs_fail (). */ | |
2034 | if (maxlen == NULL_TREE || ! tree_fits_uhwi_p (maxlen)) | |
2035 | return false; | |
8a1561bc | 2036 | } |
fef5a0d9 RB |
2037 | else |
2038 | maxlen = len; | |
2039 | ||
2040 | if (tree_int_cst_lt (size, maxlen)) | |
2041 | return false; | |
cbdd87d4 RG |
2042 | } |
2043 | ||
fef5a0d9 RB |
2044 | /* If __builtin_st{r,p}ncpy_chk is used, assume st{r,p}ncpy is available. */ |
2045 | fn = builtin_decl_explicit (fcode == BUILT_IN_STPNCPY_CHK | |
2046 | ? BUILT_IN_STPNCPY : BUILT_IN_STRNCPY); | |
2047 | if (!fn) | |
2048 | return false; | |
2049 | ||
2050 | gimple repl = gimple_build_call (fn, 3, dest, src, len); | |
2051 | replace_call_with_call_and_fold (gsi, repl); | |
2052 | return true; | |
cbdd87d4 RG |
2053 | } |
2054 | ||
fef5a0d9 RB |
2055 | /* Fold a call EXP to {,v}snprintf having NARGS passed as ARGS. Return |
2056 | NULL_TREE if a normal call should be emitted rather than expanding | |
2057 | the function inline. FCODE is either BUILT_IN_SNPRINTF_CHK or | |
2058 | BUILT_IN_VSNPRINTF_CHK. If MAXLEN is not NULL, it is maximum length | |
2059 | passed as second argument. */ | |
cbdd87d4 RG |
2060 | |
2061 | static bool | |
fef5a0d9 | 2062 | gimple_fold_builtin_snprintf_chk (gimple_stmt_iterator *gsi, |
dcb7fae2 | 2063 | enum built_in_function fcode) |
cbdd87d4 | 2064 | { |
538dd0b7 | 2065 | gcall *stmt = as_a <gcall *> (gsi_stmt (*gsi)); |
fef5a0d9 RB |
2066 | tree dest, size, len, fn, fmt, flag; |
2067 | const char *fmt_str; | |
cbdd87d4 | 2068 | |
fef5a0d9 RB |
2069 | /* Verify the required arguments in the original call. */ |
2070 | if (gimple_call_num_args (stmt) < 5) | |
2071 | return false; | |
cbdd87d4 | 2072 | |
fef5a0d9 RB |
2073 | dest = gimple_call_arg (stmt, 0); |
2074 | len = gimple_call_arg (stmt, 1); | |
2075 | flag = gimple_call_arg (stmt, 2); | |
2076 | size = gimple_call_arg (stmt, 3); | |
2077 | fmt = gimple_call_arg (stmt, 4); | |
2078 | ||
2079 | if (! tree_fits_uhwi_p (size)) | |
2080 | return false; | |
2081 | ||
2082 | if (! integer_all_onesp (size)) | |
2083 | { | |
dcb7fae2 | 2084 | tree maxlen = get_maxval_strlen (len, 2); |
fef5a0d9 | 2085 | if (! tree_fits_uhwi_p (len)) |
cbdd87d4 | 2086 | { |
fef5a0d9 RB |
2087 | /* If LEN is not constant, try MAXLEN too. |
2088 | For MAXLEN only allow optimizing into non-_ocs function | |
2089 | if SIZE is >= MAXLEN, never convert to __ocs_fail (). */ | |
2090 | if (maxlen == NULL_TREE || ! tree_fits_uhwi_p (maxlen)) | |
cbdd87d4 RG |
2091 | return false; |
2092 | } | |
2093 | else | |
fef5a0d9 | 2094 | maxlen = len; |
cbdd87d4 | 2095 | |
fef5a0d9 RB |
2096 | if (tree_int_cst_lt (size, maxlen)) |
2097 | return false; | |
2098 | } | |
cbdd87d4 | 2099 | |
fef5a0d9 RB |
2100 | if (!init_target_chars ()) |
2101 | return false; | |
cbdd87d4 | 2102 | |
fef5a0d9 RB |
2103 | /* Only convert __{,v}snprintf_chk to {,v}snprintf if flag is 0 |
2104 | or if format doesn't contain % chars or is "%s". */ | |
2105 | if (! integer_zerop (flag)) | |
2106 | { | |
2107 | fmt_str = c_getstr (fmt); | |
2108 | if (fmt_str == NULL) | |
2109 | return false; | |
2110 | if (strchr (fmt_str, target_percent) != NULL | |
2111 | && strcmp (fmt_str, target_percent_s)) | |
2112 | return false; | |
cbdd87d4 RG |
2113 | } |
2114 | ||
fef5a0d9 RB |
2115 | /* If __builtin_{,v}snprintf_chk is used, assume {,v}snprintf is |
2116 | available. */ | |
2117 | fn = builtin_decl_explicit (fcode == BUILT_IN_VSNPRINTF_CHK | |
2118 | ? BUILT_IN_VSNPRINTF : BUILT_IN_SNPRINTF); | |
2119 | if (!fn) | |
491e0b9b RG |
2120 | return false; |
2121 | ||
fef5a0d9 RB |
2122 | /* Replace the called function and the first 5 argument by 3 retaining |
2123 | trailing varargs. */ | |
2124 | gimple_call_set_fndecl (stmt, fn); | |
2125 | gimple_call_set_fntype (stmt, TREE_TYPE (fn)); | |
2126 | gimple_call_set_arg (stmt, 0, dest); | |
2127 | gimple_call_set_arg (stmt, 1, len); | |
2128 | gimple_call_set_arg (stmt, 2, fmt); | |
2129 | for (unsigned i = 3; i < gimple_call_num_args (stmt) - 2; ++i) | |
2130 | gimple_call_set_arg (stmt, i, gimple_call_arg (stmt, i + 2)); | |
2131 | gimple_set_num_ops (stmt, gimple_num_ops (stmt) - 2); | |
2132 | fold_stmt (gsi); | |
2133 | return true; | |
2134 | } | |
cbdd87d4 | 2135 | |
fef5a0d9 RB |
2136 | /* Fold a call EXP to __{,v}sprintf_chk having NARGS passed as ARGS. |
2137 | Return NULL_TREE if a normal call should be emitted rather than | |
2138 | expanding the function inline. FCODE is either BUILT_IN_SPRINTF_CHK | |
2139 | or BUILT_IN_VSPRINTF_CHK. */ | |
cbdd87d4 | 2140 | |
fef5a0d9 RB |
2141 | static bool |
2142 | gimple_fold_builtin_sprintf_chk (gimple_stmt_iterator *gsi, | |
2143 | enum built_in_function fcode) | |
2144 | { | |
538dd0b7 | 2145 | gcall *stmt = as_a <gcall *> (gsi_stmt (*gsi)); |
fef5a0d9 RB |
2146 | tree dest, size, len, fn, fmt, flag; |
2147 | const char *fmt_str; | |
2148 | unsigned nargs = gimple_call_num_args (stmt); | |
cbdd87d4 | 2149 | |
fef5a0d9 RB |
2150 | /* Verify the required arguments in the original call. */ |
2151 | if (nargs < 4) | |
2152 | return false; | |
2153 | dest = gimple_call_arg (stmt, 0); | |
2154 | flag = gimple_call_arg (stmt, 1); | |
2155 | size = gimple_call_arg (stmt, 2); | |
2156 | fmt = gimple_call_arg (stmt, 3); | |
2157 | ||
2158 | if (! tree_fits_uhwi_p (size)) | |
2159 | return false; | |
2160 | ||
2161 | len = NULL_TREE; | |
2162 | ||
2163 | if (!init_target_chars ()) | |
2164 | return false; | |
2165 | ||
2166 | /* Check whether the format is a literal string constant. */ | |
2167 | fmt_str = c_getstr (fmt); | |
2168 | if (fmt_str != NULL) | |
2169 | { | |
2170 | /* If the format doesn't contain % args or %%, we know the size. */ | |
2171 | if (strchr (fmt_str, target_percent) == 0) | |
cbdd87d4 | 2172 | { |
fef5a0d9 RB |
2173 | if (fcode != BUILT_IN_SPRINTF_CHK || nargs == 4) |
2174 | len = build_int_cstu (size_type_node, strlen (fmt_str)); | |
2175 | } | |
2176 | /* If the format is "%s" and first ... argument is a string literal, | |
2177 | we know the size too. */ | |
2178 | else if (fcode == BUILT_IN_SPRINTF_CHK | |
2179 | && strcmp (fmt_str, target_percent_s) == 0) | |
2180 | { | |
2181 | tree arg; | |
cbdd87d4 | 2182 | |
fef5a0d9 RB |
2183 | if (nargs == 5) |
2184 | { | |
2185 | arg = gimple_call_arg (stmt, 4); | |
2186 | if (POINTER_TYPE_P (TREE_TYPE (arg))) | |
2187 | { | |
2188 | len = c_strlen (arg, 1); | |
2189 | if (! len || ! tree_fits_uhwi_p (len)) | |
2190 | len = NULL_TREE; | |
2191 | } | |
2192 | } | |
2193 | } | |
2194 | } | |
cbdd87d4 | 2195 | |
fef5a0d9 RB |
2196 | if (! integer_all_onesp (size)) |
2197 | { | |
2198 | if (! len || ! tree_int_cst_lt (len, size)) | |
2199 | return false; | |
2200 | } | |
cbdd87d4 | 2201 | |
fef5a0d9 RB |
2202 | /* Only convert __{,v}sprintf_chk to {,v}sprintf if flag is 0 |
2203 | or if format doesn't contain % chars or is "%s". */ | |
2204 | if (! integer_zerop (flag)) | |
2205 | { | |
2206 | if (fmt_str == NULL) | |
2207 | return false; | |
2208 | if (strchr (fmt_str, target_percent) != NULL | |
2209 | && strcmp (fmt_str, target_percent_s)) | |
2210 | return false; | |
2211 | } | |
cbdd87d4 | 2212 | |
fef5a0d9 RB |
2213 | /* If __builtin_{,v}sprintf_chk is used, assume {,v}sprintf is available. */ |
2214 | fn = builtin_decl_explicit (fcode == BUILT_IN_VSPRINTF_CHK | |
2215 | ? BUILT_IN_VSPRINTF : BUILT_IN_SPRINTF); | |
2216 | if (!fn) | |
2217 | return false; | |
2218 | ||
2219 | /* Replace the called function and the first 4 argument by 2 retaining | |
2220 | trailing varargs. */ | |
2221 | gimple_call_set_fndecl (stmt, fn); | |
2222 | gimple_call_set_fntype (stmt, TREE_TYPE (fn)); | |
2223 | gimple_call_set_arg (stmt, 0, dest); | |
2224 | gimple_call_set_arg (stmt, 1, fmt); | |
2225 | for (unsigned i = 2; i < gimple_call_num_args (stmt) - 2; ++i) | |
2226 | gimple_call_set_arg (stmt, i, gimple_call_arg (stmt, i + 2)); | |
2227 | gimple_set_num_ops (stmt, gimple_num_ops (stmt) - 2); | |
2228 | fold_stmt (gsi); | |
2229 | return true; | |
2230 | } | |
2231 | ||
35770bb2 RB |
2232 | /* Simplify a call to the sprintf builtin with arguments DEST, FMT, and ORIG. |
2233 | ORIG may be null if this is a 2-argument call. We don't attempt to | |
2234 | simplify calls with more than 3 arguments. | |
2235 | ||
2236 | Return NULL_TREE if no simplification was possible, otherwise return the | |
2237 | simplified form of the call as a tree. If IGNORED is true, it means that | |
2238 | the caller does not use the returned value of the function. */ | |
2239 | ||
2240 | static bool | |
dcb7fae2 | 2241 | gimple_fold_builtin_sprintf (gimple_stmt_iterator *gsi) |
35770bb2 RB |
2242 | { |
2243 | gimple stmt = gsi_stmt (*gsi); | |
2244 | tree dest = gimple_call_arg (stmt, 0); | |
2245 | tree fmt = gimple_call_arg (stmt, 1); | |
2246 | tree orig = NULL_TREE; | |
2247 | const char *fmt_str = NULL; | |
2248 | ||
2249 | /* Verify the required arguments in the original call. We deal with two | |
2250 | types of sprintf() calls: 'sprintf (str, fmt)' and | |
2251 | 'sprintf (dest, "%s", orig)'. */ | |
2252 | if (gimple_call_num_args (stmt) > 3) | |
2253 | return false; | |
2254 | ||
2255 | if (gimple_call_num_args (stmt) == 3) | |
2256 | orig = gimple_call_arg (stmt, 2); | |
2257 | ||
2258 | /* Check whether the format is a literal string constant. */ | |
2259 | fmt_str = c_getstr (fmt); | |
2260 | if (fmt_str == NULL) | |
2261 | return false; | |
2262 | ||
2263 | if (!init_target_chars ()) | |
2264 | return false; | |
2265 | ||
2266 | /* If the format doesn't contain % args or %%, use strcpy. */ | |
2267 | if (strchr (fmt_str, target_percent) == NULL) | |
2268 | { | |
2269 | tree fn = builtin_decl_implicit (BUILT_IN_STRCPY); | |
2270 | ||
2271 | if (!fn) | |
2272 | return false; | |
2273 | ||
2274 | /* Don't optimize sprintf (buf, "abc", ptr++). */ | |
2275 | if (orig) | |
2276 | return false; | |
2277 | ||
2278 | /* Convert sprintf (str, fmt) into strcpy (str, fmt) when | |
2279 | 'format' is known to contain no % formats. */ | |
2280 | gimple_seq stmts = NULL; | |
2281 | gimple repl = gimple_build_call (fn, 2, dest, fmt); | |
2282 | gimple_seq_add_stmt_without_update (&stmts, repl); | |
2283 | if (gimple_call_lhs (stmt)) | |
2284 | { | |
2285 | repl = gimple_build_assign (gimple_call_lhs (stmt), | |
2286 | build_int_cst (integer_type_node, | |
2287 | strlen (fmt_str))); | |
2288 | gimple_seq_add_stmt_without_update (&stmts, repl); | |
2289 | gsi_replace_with_seq_vops (gsi, stmts); | |
2290 | /* gsi now points at the assignment to the lhs, get a | |
2291 | stmt iterator to the memcpy call. | |
2292 | ??? We can't use gsi_for_stmt as that doesn't work when the | |
2293 | CFG isn't built yet. */ | |
2294 | gimple_stmt_iterator gsi2 = *gsi; | |
2295 | gsi_prev (&gsi2); | |
2296 | fold_stmt (&gsi2); | |
2297 | } | |
2298 | else | |
2299 | { | |
2300 | gsi_replace_with_seq_vops (gsi, stmts); | |
2301 | fold_stmt (gsi); | |
2302 | } | |
2303 | return true; | |
2304 | } | |
2305 | ||
2306 | /* If the format is "%s", use strcpy if the result isn't used. */ | |
2307 | else if (fmt_str && strcmp (fmt_str, target_percent_s) == 0) | |
2308 | { | |
2309 | tree fn; | |
2310 | fn = builtin_decl_implicit (BUILT_IN_STRCPY); | |
2311 | ||
2312 | if (!fn) | |
2313 | return false; | |
2314 | ||
2315 | /* Don't crash on sprintf (str1, "%s"). */ | |
2316 | if (!orig) | |
2317 | return false; | |
2318 | ||
dcb7fae2 RB |
2319 | tree orig_len = NULL_TREE; |
2320 | if (gimple_call_lhs (stmt)) | |
35770bb2 | 2321 | { |
dcb7fae2 | 2322 | orig_len = get_maxval_strlen (orig, 0); |
d7e78447 | 2323 | if (!orig_len) |
35770bb2 RB |
2324 | return false; |
2325 | } | |
2326 | ||
2327 | /* Convert sprintf (str1, "%s", str2) into strcpy (str1, str2). */ | |
2328 | gimple_seq stmts = NULL; | |
2329 | gimple repl = gimple_build_call (fn, 2, dest, orig); | |
2330 | gimple_seq_add_stmt_without_update (&stmts, repl); | |
2331 | if (gimple_call_lhs (stmt)) | |
2332 | { | |
d7e78447 RB |
2333 | if (!useless_type_conversion_p (integer_type_node, |
2334 | TREE_TYPE (orig_len))) | |
2335 | orig_len = fold_convert (integer_type_node, orig_len); | |
2336 | repl = gimple_build_assign (gimple_call_lhs (stmt), orig_len); | |
35770bb2 RB |
2337 | gimple_seq_add_stmt_without_update (&stmts, repl); |
2338 | gsi_replace_with_seq_vops (gsi, stmts); | |
2339 | /* gsi now points at the assignment to the lhs, get a | |
2340 | stmt iterator to the memcpy call. | |
2341 | ??? We can't use gsi_for_stmt as that doesn't work when the | |
2342 | CFG isn't built yet. */ | |
2343 | gimple_stmt_iterator gsi2 = *gsi; | |
2344 | gsi_prev (&gsi2); | |
2345 | fold_stmt (&gsi2); | |
2346 | } | |
2347 | else | |
2348 | { | |
2349 | gsi_replace_with_seq_vops (gsi, stmts); | |
2350 | fold_stmt (gsi); | |
2351 | } | |
2352 | return true; | |
2353 | } | |
2354 | return false; | |
2355 | } | |
2356 | ||
d7e78447 RB |
2357 | /* Simplify a call to the snprintf builtin with arguments DEST, DESTSIZE, |
2358 | FMT, and ORIG. ORIG may be null if this is a 3-argument call. We don't | |
2359 | attempt to simplify calls with more than 4 arguments. | |
35770bb2 | 2360 | |
d7e78447 RB |
2361 | Return NULL_TREE if no simplification was possible, otherwise return the |
2362 | simplified form of the call as a tree. If IGNORED is true, it means that | |
2363 | the caller does not use the returned value of the function. */ | |
2364 | ||
2365 | static bool | |
dcb7fae2 | 2366 | gimple_fold_builtin_snprintf (gimple_stmt_iterator *gsi) |
d7e78447 | 2367 | { |
538dd0b7 | 2368 | gcall *stmt = as_a <gcall *> (gsi_stmt (*gsi)); |
d7e78447 RB |
2369 | tree dest = gimple_call_arg (stmt, 0); |
2370 | tree destsize = gimple_call_arg (stmt, 1); | |
2371 | tree fmt = gimple_call_arg (stmt, 2); | |
2372 | tree orig = NULL_TREE; | |
2373 | const char *fmt_str = NULL; | |
2374 | ||
2375 | if (gimple_call_num_args (stmt) > 4) | |
2376 | return false; | |
2377 | ||
2378 | if (gimple_call_num_args (stmt) == 4) | |
2379 | orig = gimple_call_arg (stmt, 3); | |
2380 | ||
2381 | if (!tree_fits_uhwi_p (destsize)) | |
2382 | return false; | |
2383 | unsigned HOST_WIDE_INT destlen = tree_to_uhwi (destsize); | |
2384 | ||
2385 | /* Check whether the format is a literal string constant. */ | |
2386 | fmt_str = c_getstr (fmt); | |
2387 | if (fmt_str == NULL) | |
2388 | return false; | |
2389 | ||
2390 | if (!init_target_chars ()) | |
2391 | return false; | |
2392 | ||
2393 | /* If the format doesn't contain % args or %%, use strcpy. */ | |
2394 | if (strchr (fmt_str, target_percent) == NULL) | |
2395 | { | |
2396 | tree fn = builtin_decl_implicit (BUILT_IN_STRCPY); | |
2397 | if (!fn) | |
2398 | return false; | |
2399 | ||
2400 | /* Don't optimize snprintf (buf, 4, "abc", ptr++). */ | |
2401 | if (orig) | |
2402 | return false; | |
2403 | ||
2404 | /* We could expand this as | |
2405 | memcpy (str, fmt, cst - 1); str[cst - 1] = '\0'; | |
2406 | or to | |
2407 | memcpy (str, fmt_with_nul_at_cstm1, cst); | |
2408 | but in the former case that might increase code size | |
2409 | and in the latter case grow .rodata section too much. | |
2410 | So punt for now. */ | |
2411 | size_t len = strlen (fmt_str); | |
2412 | if (len >= destlen) | |
2413 | return false; | |
2414 | ||
2415 | gimple_seq stmts = NULL; | |
2416 | gimple repl = gimple_build_call (fn, 2, dest, fmt); | |
2417 | gimple_seq_add_stmt_without_update (&stmts, repl); | |
2418 | if (gimple_call_lhs (stmt)) | |
2419 | { | |
2420 | repl = gimple_build_assign (gimple_call_lhs (stmt), | |
2421 | build_int_cst (integer_type_node, len)); | |
2422 | gimple_seq_add_stmt_without_update (&stmts, repl); | |
2423 | gsi_replace_with_seq_vops (gsi, stmts); | |
2424 | /* gsi now points at the assignment to the lhs, get a | |
2425 | stmt iterator to the memcpy call. | |
2426 | ??? We can't use gsi_for_stmt as that doesn't work when the | |
2427 | CFG isn't built yet. */ | |
2428 | gimple_stmt_iterator gsi2 = *gsi; | |
2429 | gsi_prev (&gsi2); | |
2430 | fold_stmt (&gsi2); | |
2431 | } | |
2432 | else | |
2433 | { | |
2434 | gsi_replace_with_seq_vops (gsi, stmts); | |
2435 | fold_stmt (gsi); | |
2436 | } | |
2437 | return true; | |
2438 | } | |
2439 | ||
2440 | /* If the format is "%s", use strcpy if the result isn't used. */ | |
2441 | else if (fmt_str && strcmp (fmt_str, target_percent_s) == 0) | |
2442 | { | |
2443 | tree fn = builtin_decl_implicit (BUILT_IN_STRCPY); | |
2444 | if (!fn) | |
2445 | return false; | |
2446 | ||
2447 | /* Don't crash on snprintf (str1, cst, "%s"). */ | |
2448 | if (!orig) | |
2449 | return false; | |
2450 | ||
dcb7fae2 | 2451 | tree orig_len = get_maxval_strlen (orig, 0); |
d7e78447 | 2452 | if (!orig_len) |
dcb7fae2 | 2453 | return false; |
d7e78447 RB |
2454 | |
2455 | /* We could expand this as | |
2456 | memcpy (str1, str2, cst - 1); str1[cst - 1] = '\0'; | |
2457 | or to | |
2458 | memcpy (str1, str2_with_nul_at_cstm1, cst); | |
2459 | but in the former case that might increase code size | |
2460 | and in the latter case grow .rodata section too much. | |
2461 | So punt for now. */ | |
2462 | if (compare_tree_int (orig_len, destlen) >= 0) | |
2463 | return false; | |
2464 | ||
2465 | /* Convert snprintf (str1, cst, "%s", str2) into | |
2466 | strcpy (str1, str2) if strlen (str2) < cst. */ | |
2467 | gimple_seq stmts = NULL; | |
2468 | gimple repl = gimple_build_call (fn, 2, dest, orig); | |
2469 | gimple_seq_add_stmt_without_update (&stmts, repl); | |
2470 | if (gimple_call_lhs (stmt)) | |
2471 | { | |
2472 | if (!useless_type_conversion_p (integer_type_node, | |
2473 | TREE_TYPE (orig_len))) | |
2474 | orig_len = fold_convert (integer_type_node, orig_len); | |
2475 | repl = gimple_build_assign (gimple_call_lhs (stmt), orig_len); | |
2476 | gimple_seq_add_stmt_without_update (&stmts, repl); | |
2477 | gsi_replace_with_seq_vops (gsi, stmts); | |
2478 | /* gsi now points at the assignment to the lhs, get a | |
2479 | stmt iterator to the memcpy call. | |
2480 | ??? We can't use gsi_for_stmt as that doesn't work when the | |
2481 | CFG isn't built yet. */ | |
2482 | gimple_stmt_iterator gsi2 = *gsi; | |
2483 | gsi_prev (&gsi2); | |
2484 | fold_stmt (&gsi2); | |
2485 | } | |
2486 | else | |
2487 | { | |
2488 | gsi_replace_with_seq_vops (gsi, stmts); | |
2489 | fold_stmt (gsi); | |
2490 | } | |
2491 | return true; | |
2492 | } | |
2493 | return false; | |
2494 | } | |
35770bb2 | 2495 | |
edd7ae68 RB |
2496 | /* Fold a call to the {,v}fprintf{,_unlocked} and __{,v}printf_chk builtins. |
2497 | FP, FMT, and ARG are the arguments to the call. We don't fold calls with | |
2498 | more than 3 arguments, and ARG may be null in the 2-argument case. | |
2499 | ||
2500 | Return NULL_TREE if no simplification was possible, otherwise return the | |
2501 | simplified form of the call as a tree. FCODE is the BUILT_IN_* | |
2502 | code of the function to be simplified. */ | |
2503 | ||
2504 | static bool | |
2505 | gimple_fold_builtin_fprintf (gimple_stmt_iterator *gsi, | |
2506 | tree fp, tree fmt, tree arg, | |
2507 | enum built_in_function fcode) | |
2508 | { | |
2509 | gcall *stmt = as_a <gcall *> (gsi_stmt (*gsi)); | |
2510 | tree fn_fputc, fn_fputs; | |
2511 | const char *fmt_str = NULL; | |
2512 | ||
2513 | /* If the return value is used, don't do the transformation. */ | |
2514 | if (gimple_call_lhs (stmt) != NULL_TREE) | |
2515 | return false; | |
2516 | ||
2517 | /* Check whether the format is a literal string constant. */ | |
2518 | fmt_str = c_getstr (fmt); | |
2519 | if (fmt_str == NULL) | |
2520 | return false; | |
2521 | ||
2522 | if (fcode == BUILT_IN_FPRINTF_UNLOCKED) | |
2523 | { | |
2524 | /* If we're using an unlocked function, assume the other | |
2525 | unlocked functions exist explicitly. */ | |
2526 | fn_fputc = builtin_decl_explicit (BUILT_IN_FPUTC_UNLOCKED); | |
2527 | fn_fputs = builtin_decl_explicit (BUILT_IN_FPUTS_UNLOCKED); | |
2528 | } | |
2529 | else | |
2530 | { | |
2531 | fn_fputc = builtin_decl_implicit (BUILT_IN_FPUTC); | |
2532 | fn_fputs = builtin_decl_implicit (BUILT_IN_FPUTS); | |
2533 | } | |
2534 | ||
2535 | if (!init_target_chars ()) | |
2536 | return false; | |
2537 | ||
2538 | /* If the format doesn't contain % args or %%, use strcpy. */ | |
2539 | if (strchr (fmt_str, target_percent) == NULL) | |
2540 | { | |
2541 | if (fcode != BUILT_IN_VFPRINTF && fcode != BUILT_IN_VFPRINTF_CHK | |
2542 | && arg) | |
2543 | return false; | |
2544 | ||
2545 | /* If the format specifier was "", fprintf does nothing. */ | |
2546 | if (fmt_str[0] == '\0') | |
2547 | { | |
2548 | replace_call_with_value (gsi, NULL_TREE); | |
2549 | return true; | |
2550 | } | |
2551 | ||
2552 | /* When "string" doesn't contain %, replace all cases of | |
2553 | fprintf (fp, string) with fputs (string, fp). The fputs | |
2554 | builtin will take care of special cases like length == 1. */ | |
2555 | if (fn_fputs) | |
2556 | { | |
2557 | gcall *repl = gimple_build_call (fn_fputs, 2, fmt, fp); | |
2558 | replace_call_with_call_and_fold (gsi, repl); | |
2559 | return true; | |
2560 | } | |
2561 | } | |
2562 | ||
2563 | /* The other optimizations can be done only on the non-va_list variants. */ | |
2564 | else if (fcode == BUILT_IN_VFPRINTF || fcode == BUILT_IN_VFPRINTF_CHK) | |
2565 | return false; | |
2566 | ||
2567 | /* If the format specifier was "%s", call __builtin_fputs (arg, fp). */ | |
2568 | else if (strcmp (fmt_str, target_percent_s) == 0) | |
2569 | { | |
2570 | if (!arg || ! POINTER_TYPE_P (TREE_TYPE (arg))) | |
2571 | return false; | |
2572 | if (fn_fputs) | |
2573 | { | |
2574 | gcall *repl = gimple_build_call (fn_fputs, 2, arg, fp); | |
2575 | replace_call_with_call_and_fold (gsi, repl); | |
2576 | return true; | |
2577 | } | |
2578 | } | |
2579 | ||
2580 | /* If the format specifier was "%c", call __builtin_fputc (arg, fp). */ | |
2581 | else if (strcmp (fmt_str, target_percent_c) == 0) | |
2582 | { | |
2583 | if (!arg | |
2584 | || ! useless_type_conversion_p (integer_type_node, TREE_TYPE (arg))) | |
2585 | return false; | |
2586 | if (fn_fputc) | |
2587 | { | |
2588 | gcall *repl = gimple_build_call (fn_fputc, 2, arg, fp); | |
2589 | replace_call_with_call_and_fold (gsi, repl); | |
2590 | return true; | |
2591 | } | |
2592 | } | |
2593 | ||
2594 | return false; | |
2595 | } | |
2596 | ||
ad03a744 RB |
2597 | /* Fold a call to the {,v}printf{,_unlocked} and __{,v}printf_chk builtins. |
2598 | FMT and ARG are the arguments to the call; we don't fold cases with | |
2599 | more than 2 arguments, and ARG may be null if this is a 1-argument case. | |
2600 | ||
2601 | Return NULL_TREE if no simplification was possible, otherwise return the | |
2602 | simplified form of the call as a tree. FCODE is the BUILT_IN_* | |
2603 | code of the function to be simplified. */ | |
2604 | ||
2605 | static bool | |
2606 | gimple_fold_builtin_printf (gimple_stmt_iterator *gsi, tree fmt, | |
2607 | tree arg, enum built_in_function fcode) | |
2608 | { | |
2609 | gcall *stmt = as_a <gcall *> (gsi_stmt (*gsi)); | |
2610 | tree fn_putchar, fn_puts, newarg; | |
2611 | const char *fmt_str = NULL; | |
2612 | ||
2613 | /* If the return value is used, don't do the transformation. */ | |
2614 | if (gimple_call_lhs (stmt) != NULL_TREE) | |
2615 | return false; | |
2616 | ||
2617 | /* Check whether the format is a literal string constant. */ | |
2618 | fmt_str = c_getstr (fmt); | |
2619 | if (fmt_str == NULL) | |
2620 | return false; | |
2621 | ||
2622 | if (fcode == BUILT_IN_PRINTF_UNLOCKED) | |
2623 | { | |
2624 | /* If we're using an unlocked function, assume the other | |
2625 | unlocked functions exist explicitly. */ | |
2626 | fn_putchar = builtin_decl_explicit (BUILT_IN_PUTCHAR_UNLOCKED); | |
2627 | fn_puts = builtin_decl_explicit (BUILT_IN_PUTS_UNLOCKED); | |
2628 | } | |
2629 | else | |
2630 | { | |
2631 | fn_putchar = builtin_decl_implicit (BUILT_IN_PUTCHAR); | |
2632 | fn_puts = builtin_decl_implicit (BUILT_IN_PUTS); | |
2633 | } | |
2634 | ||
2635 | if (!init_target_chars ()) | |
2636 | return false; | |
2637 | ||
2638 | if (strcmp (fmt_str, target_percent_s) == 0 | |
2639 | || strchr (fmt_str, target_percent) == NULL) | |
2640 | { | |
2641 | const char *str; | |
2642 | ||
2643 | if (strcmp (fmt_str, target_percent_s) == 0) | |
2644 | { | |
2645 | if (fcode == BUILT_IN_VPRINTF || fcode == BUILT_IN_VPRINTF_CHK) | |
2646 | return false; | |
2647 | ||
2648 | if (!arg || ! POINTER_TYPE_P (TREE_TYPE (arg))) | |
2649 | return false; | |
2650 | ||
2651 | str = c_getstr (arg); | |
2652 | if (str == NULL) | |
2653 | return false; | |
2654 | } | |
2655 | else | |
2656 | { | |
2657 | /* The format specifier doesn't contain any '%' characters. */ | |
2658 | if (fcode != BUILT_IN_VPRINTF && fcode != BUILT_IN_VPRINTF_CHK | |
2659 | && arg) | |
2660 | return false; | |
2661 | str = fmt_str; | |
2662 | } | |
2663 | ||
2664 | /* If the string was "", printf does nothing. */ | |
2665 | if (str[0] == '\0') | |
2666 | { | |
2667 | replace_call_with_value (gsi, NULL_TREE); | |
2668 | return true; | |
2669 | } | |
2670 | ||
2671 | /* If the string has length of 1, call putchar. */ | |
2672 | if (str[1] == '\0') | |
2673 | { | |
2674 | /* Given printf("c"), (where c is any one character,) | |
2675 | convert "c"[0] to an int and pass that to the replacement | |
2676 | function. */ | |
2677 | newarg = build_int_cst (integer_type_node, str[0]); | |
2678 | if (fn_putchar) | |
2679 | { | |
2680 | gcall *repl = gimple_build_call (fn_putchar, 1, newarg); | |
2681 | replace_call_with_call_and_fold (gsi, repl); | |
2682 | return true; | |
2683 | } | |
2684 | } | |
2685 | else | |
2686 | { | |
2687 | /* If the string was "string\n", call puts("string"). */ | |
2688 | size_t len = strlen (str); | |
2689 | if ((unsigned char)str[len - 1] == target_newline | |
2690 | && (size_t) (int) len == len | |
2691 | && (int) len > 0) | |
2692 | { | |
2693 | char *newstr; | |
2694 | tree offset_node, string_cst; | |
2695 | ||
2696 | /* Create a NUL-terminated string that's one char shorter | |
2697 | than the original, stripping off the trailing '\n'. */ | |
2698 | newarg = build_string_literal (len, str); | |
2699 | string_cst = string_constant (newarg, &offset_node); | |
2700 | gcc_checking_assert (string_cst | |
2701 | && (TREE_STRING_LENGTH (string_cst) | |
2702 | == (int) len) | |
2703 | && integer_zerop (offset_node) | |
2704 | && (unsigned char) | |
2705 | TREE_STRING_POINTER (string_cst)[len - 1] | |
2706 | == target_newline); | |
2707 | /* build_string_literal creates a new STRING_CST, | |
2708 | modify it in place to avoid double copying. */ | |
2709 | newstr = CONST_CAST (char *, TREE_STRING_POINTER (string_cst)); | |
2710 | newstr[len - 1] = '\0'; | |
2711 | if (fn_puts) | |
2712 | { | |
2713 | gcall *repl = gimple_build_call (fn_puts, 1, newarg); | |
2714 | replace_call_with_call_and_fold (gsi, repl); | |
2715 | return true; | |
2716 | } | |
2717 | } | |
2718 | else | |
2719 | /* We'd like to arrange to call fputs(string,stdout) here, | |
2720 | but we need stdout and don't have a way to get it yet. */ | |
2721 | return false; | |
2722 | } | |
2723 | } | |
2724 | ||
2725 | /* The other optimizations can be done only on the non-va_list variants. */ | |
2726 | else if (fcode == BUILT_IN_VPRINTF || fcode == BUILT_IN_VPRINTF_CHK) | |
2727 | return false; | |
2728 | ||
2729 | /* If the format specifier was "%s\n", call __builtin_puts(arg). */ | |
2730 | else if (strcmp (fmt_str, target_percent_s_newline) == 0) | |
2731 | { | |
2732 | if (!arg || ! POINTER_TYPE_P (TREE_TYPE (arg))) | |
2733 | return false; | |
2734 | if (fn_puts) | |
2735 | { | |
2736 | gcall *repl = gimple_build_call (fn_puts, 1, arg); | |
2737 | replace_call_with_call_and_fold (gsi, repl); | |
2738 | return true; | |
2739 | } | |
2740 | } | |
2741 | ||
2742 | /* If the format specifier was "%c", call __builtin_putchar(arg). */ | |
2743 | else if (strcmp (fmt_str, target_percent_c) == 0) | |
2744 | { | |
2745 | if (!arg || ! useless_type_conversion_p (integer_type_node, | |
2746 | TREE_TYPE (arg))) | |
2747 | return false; | |
2748 | if (fn_putchar) | |
2749 | { | |
2750 | gcall *repl = gimple_build_call (fn_putchar, 1, arg); | |
2751 | replace_call_with_call_and_fold (gsi, repl); | |
2752 | return true; | |
2753 | } | |
2754 | } | |
2755 | ||
2756 | return false; | |
2757 | } | |
2758 | ||
edd7ae68 | 2759 | |
fef5a0d9 RB |
2760 | |
2761 | /* Fold a call to __builtin_strlen with known length LEN. */ | |
2762 | ||
2763 | static bool | |
dcb7fae2 | 2764 | gimple_fold_builtin_strlen (gimple_stmt_iterator *gsi) |
fef5a0d9 | 2765 | { |
dcb7fae2 RB |
2766 | gimple stmt = gsi_stmt (*gsi); |
2767 | tree len = get_maxval_strlen (gimple_call_arg (stmt, 0), 0); | |
fef5a0d9 RB |
2768 | if (!len) |
2769 | return false; | |
2813904b | 2770 | len = force_gimple_operand_gsi (gsi, len, true, NULL, true, GSI_SAME_STMT); |
fef5a0d9 RB |
2771 | replace_call_with_value (gsi, len); |
2772 | return true; | |
cbdd87d4 RG |
2773 | } |
2774 | ||
2775 | ||
dcb7fae2 RB |
2776 | /* Fold the non-target builtin at *GSI and return whether any simplification |
2777 | was made. */ | |
cbdd87d4 | 2778 | |
fef5a0d9 | 2779 | static bool |
dcb7fae2 | 2780 | gimple_fold_builtin (gimple_stmt_iterator *gsi) |
cbdd87d4 | 2781 | { |
538dd0b7 | 2782 | gcall *stmt = as_a <gcall *>(gsi_stmt (*gsi)); |
fef5a0d9 | 2783 | tree callee = gimple_call_fndecl (stmt); |
cbdd87d4 | 2784 | |
dcb7fae2 RB |
2785 | /* Give up for always_inline inline builtins until they are |
2786 | inlined. */ | |
2787 | if (avoid_folding_inline_builtin (callee)) | |
2788 | return false; | |
cbdd87d4 | 2789 | |
edd7ae68 RB |
2790 | unsigned n = gimple_call_num_args (stmt); |
2791 | enum built_in_function fcode = DECL_FUNCTION_CODE (callee); | |
2792 | switch (fcode) | |
cbdd87d4 | 2793 | { |
dcb7fae2 RB |
2794 | case BUILT_IN_BZERO: |
2795 | return gimple_fold_builtin_memset (gsi, integer_zero_node, | |
2796 | gimple_call_arg (stmt, 1)); | |
2797 | case BUILT_IN_MEMSET: | |
2798 | return gimple_fold_builtin_memset (gsi, | |
2799 | gimple_call_arg (stmt, 1), | |
2800 | gimple_call_arg (stmt, 2)); | |
2801 | case BUILT_IN_BCOPY: | |
2802 | return gimple_fold_builtin_memory_op (gsi, gimple_call_arg (stmt, 1), | |
2803 | gimple_call_arg (stmt, 0), 3); | |
2804 | case BUILT_IN_MEMCPY: | |
2805 | return gimple_fold_builtin_memory_op (gsi, gimple_call_arg (stmt, 0), | |
2806 | gimple_call_arg (stmt, 1), 0); | |
2807 | case BUILT_IN_MEMPCPY: | |
2808 | return gimple_fold_builtin_memory_op (gsi, gimple_call_arg (stmt, 0), | |
2809 | gimple_call_arg (stmt, 1), 1); | |
2810 | case BUILT_IN_MEMMOVE: | |
2811 | return gimple_fold_builtin_memory_op (gsi, gimple_call_arg (stmt, 0), | |
2812 | gimple_call_arg (stmt, 1), 3); | |
2813 | case BUILT_IN_SPRINTF_CHK: | |
2814 | case BUILT_IN_VSPRINTF_CHK: | |
edd7ae68 | 2815 | return gimple_fold_builtin_sprintf_chk (gsi, fcode); |
dcb7fae2 RB |
2816 | case BUILT_IN_STRCAT_CHK: |
2817 | return gimple_fold_builtin_strcat_chk (gsi); | |
745583f9 RB |
2818 | case BUILT_IN_STRNCAT_CHK: |
2819 | return gimple_fold_builtin_strncat_chk (gsi); | |
cbdd87d4 | 2820 | case BUILT_IN_STRLEN: |
dcb7fae2 | 2821 | return gimple_fold_builtin_strlen (gsi); |
cbdd87d4 | 2822 | case BUILT_IN_STRCPY: |
dcb7fae2 | 2823 | return gimple_fold_builtin_strcpy (gsi, |
fef5a0d9 | 2824 | gimple_call_arg (stmt, 0), |
dcb7fae2 | 2825 | gimple_call_arg (stmt, 1)); |
cbdd87d4 | 2826 | case BUILT_IN_STRNCPY: |
dcb7fae2 | 2827 | return gimple_fold_builtin_strncpy (gsi, |
fef5a0d9 RB |
2828 | gimple_call_arg (stmt, 0), |
2829 | gimple_call_arg (stmt, 1), | |
dcb7fae2 | 2830 | gimple_call_arg (stmt, 2)); |
9a7eefec | 2831 | case BUILT_IN_STRCAT: |
dcb7fae2 RB |
2832 | return gimple_fold_builtin_strcat (gsi, gimple_call_arg (stmt, 0), |
2833 | gimple_call_arg (stmt, 1)); | |
ad03a744 RB |
2834 | case BUILT_IN_STRNCAT: |
2835 | return gimple_fold_builtin_strncat (gsi); | |
cbdd87d4 | 2836 | case BUILT_IN_FPUTS: |
dcb7fae2 RB |
2837 | return gimple_fold_builtin_fputs (gsi, gimple_call_arg (stmt, 0), |
2838 | gimple_call_arg (stmt, 1), false); | |
cbdd87d4 | 2839 | case BUILT_IN_FPUTS_UNLOCKED: |
dcb7fae2 RB |
2840 | return gimple_fold_builtin_fputs (gsi, gimple_call_arg (stmt, 0), |
2841 | gimple_call_arg (stmt, 1), true); | |
cbdd87d4 RG |
2842 | case BUILT_IN_MEMCPY_CHK: |
2843 | case BUILT_IN_MEMPCPY_CHK: | |
2844 | case BUILT_IN_MEMMOVE_CHK: | |
2845 | case BUILT_IN_MEMSET_CHK: | |
dcb7fae2 | 2846 | return gimple_fold_builtin_memory_chk (gsi, |
fef5a0d9 RB |
2847 | gimple_call_arg (stmt, 0), |
2848 | gimple_call_arg (stmt, 1), | |
2849 | gimple_call_arg (stmt, 2), | |
2850 | gimple_call_arg (stmt, 3), | |
edd7ae68 | 2851 | fcode); |
cbdd87d4 RG |
2852 | case BUILT_IN_STRCPY_CHK: |
2853 | case BUILT_IN_STPCPY_CHK: | |
dcb7fae2 | 2854 | return gimple_fold_builtin_stxcpy_chk (gsi, |
fef5a0d9 RB |
2855 | gimple_call_arg (stmt, 0), |
2856 | gimple_call_arg (stmt, 1), | |
2857 | gimple_call_arg (stmt, 2), | |
edd7ae68 | 2858 | fcode); |
cbdd87d4 | 2859 | case BUILT_IN_STRNCPY_CHK: |
f3fc9b80 | 2860 | case BUILT_IN_STPNCPY_CHK: |
fef5a0d9 RB |
2861 | return gimple_fold_builtin_stxncpy_chk (gsi, |
2862 | gimple_call_arg (stmt, 0), | |
2863 | gimple_call_arg (stmt, 1), | |
2864 | gimple_call_arg (stmt, 2), | |
2865 | gimple_call_arg (stmt, 3), | |
edd7ae68 | 2866 | fcode); |
cbdd87d4 RG |
2867 | case BUILT_IN_SNPRINTF_CHK: |
2868 | case BUILT_IN_VSNPRINTF_CHK: | |
edd7ae68 | 2869 | return gimple_fold_builtin_snprintf_chk (gsi, fcode); |
d7e78447 | 2870 | case BUILT_IN_SNPRINTF: |
dcb7fae2 | 2871 | return gimple_fold_builtin_snprintf (gsi); |
d7e78447 | 2872 | case BUILT_IN_SPRINTF: |
dcb7fae2 | 2873 | return gimple_fold_builtin_sprintf (gsi); |
edd7ae68 RB |
2874 | case BUILT_IN_FPRINTF: |
2875 | case BUILT_IN_FPRINTF_UNLOCKED: | |
2876 | case BUILT_IN_VFPRINTF: | |
2877 | if (n == 2 || n == 3) | |
2878 | return gimple_fold_builtin_fprintf (gsi, | |
2879 | gimple_call_arg (stmt, 0), | |
2880 | gimple_call_arg (stmt, 1), | |
2881 | n == 3 | |
2882 | ? gimple_call_arg (stmt, 2) | |
2883 | : NULL_TREE, | |
2884 | fcode); | |
2885 | break; | |
2886 | case BUILT_IN_FPRINTF_CHK: | |
2887 | case BUILT_IN_VFPRINTF_CHK: | |
2888 | if (n == 3 || n == 4) | |
2889 | return gimple_fold_builtin_fprintf (gsi, | |
2890 | gimple_call_arg (stmt, 0), | |
2891 | gimple_call_arg (stmt, 2), | |
2892 | n == 4 | |
2893 | ? gimple_call_arg (stmt, 3) | |
2894 | : NULL_TREE, | |
2895 | fcode); | |
2896 | break; | |
ad03a744 RB |
2897 | case BUILT_IN_PRINTF: |
2898 | case BUILT_IN_PRINTF_UNLOCKED: | |
2899 | case BUILT_IN_VPRINTF: | |
2900 | if (n == 1 || n == 2) | |
2901 | return gimple_fold_builtin_printf (gsi, gimple_call_arg (stmt, 0), | |
2902 | n == 2 | |
2903 | ? gimple_call_arg (stmt, 1) | |
2904 | : NULL_TREE, fcode); | |
2905 | break; | |
2906 | case BUILT_IN_PRINTF_CHK: | |
2907 | case BUILT_IN_VPRINTF_CHK: | |
2908 | if (n == 2 || n == 3) | |
2909 | return gimple_fold_builtin_printf (gsi, gimple_call_arg (stmt, 1), | |
2910 | n == 3 | |
2911 | ? gimple_call_arg (stmt, 2) | |
2912 | : NULL_TREE, fcode); | |
fef5a0d9 RB |
2913 | default:; |
2914 | } | |
2915 | ||
2916 | /* Try the generic builtin folder. */ | |
2917 | bool ignore = (gimple_call_lhs (stmt) == NULL); | |
2918 | tree result = fold_call_stmt (stmt, ignore); | |
2919 | if (result) | |
2920 | { | |
2921 | if (ignore) | |
2922 | STRIP_NOPS (result); | |
2923 | else | |
2924 | result = fold_convert (gimple_call_return_type (stmt), result); | |
2925 | if (!update_call_from_tree (gsi, result)) | |
2926 | gimplify_and_update_call_from_tree (gsi, result); | |
2927 | return true; | |
2928 | } | |
2929 | ||
2930 | return false; | |
2931 | } | |
2932 | ||
1304953e JJ |
2933 | /* Return true if ARG0 CODE ARG1 in infinite signed precision operation |
2934 | doesn't fit into TYPE. The test for overflow should be regardless of | |
2935 | -fwrapv, and even for unsigned types. */ | |
2936 | ||
2937 | bool | |
2938 | arith_overflowed_p (enum tree_code code, const_tree type, | |
2939 | const_tree arg0, const_tree arg1) | |
2940 | { | |
2941 | typedef FIXED_WIDE_INT (WIDE_INT_MAX_PRECISION * 2) widest2_int; | |
2942 | typedef generic_wide_int <wi::extended_tree <WIDE_INT_MAX_PRECISION * 2> > | |
2943 | widest2_int_cst; | |
2944 | widest2_int warg0 = widest2_int_cst (arg0); | |
2945 | widest2_int warg1 = widest2_int_cst (arg1); | |
2946 | widest2_int wres; | |
2947 | switch (code) | |
2948 | { | |
2949 | case PLUS_EXPR: wres = wi::add (warg0, warg1); break; | |
2950 | case MINUS_EXPR: wres = wi::sub (warg0, warg1); break; | |
2951 | case MULT_EXPR: wres = wi::mul (warg0, warg1); break; | |
2952 | default: gcc_unreachable (); | |
2953 | } | |
2954 | signop sign = TYPE_SIGN (type); | |
2955 | if (sign == UNSIGNED && wi::neg_p (wres)) | |
2956 | return true; | |
2957 | return wi::min_precision (wres, sign) > TYPE_PRECISION (type); | |
2958 | } | |
2959 | ||
cbdd87d4 RG |
2960 | /* Attempt to fold a call statement referenced by the statement iterator GSI. |
2961 | The statement may be replaced by another statement, e.g., if the call | |
2962 | simplifies to a constant value. Return true if any changes were made. | |
2963 | It is assumed that the operands have been previously folded. */ | |
2964 | ||
e021c122 | 2965 | static bool |
ceeffab0 | 2966 | gimple_fold_call (gimple_stmt_iterator *gsi, bool inplace) |
cbdd87d4 | 2967 | { |
538dd0b7 | 2968 | gcall *stmt = as_a <gcall *> (gsi_stmt (*gsi)); |
3b45a007 | 2969 | tree callee; |
e021c122 RG |
2970 | bool changed = false; |
2971 | unsigned i; | |
cbdd87d4 | 2972 | |
e021c122 RG |
2973 | /* Fold *& in call arguments. */ |
2974 | for (i = 0; i < gimple_call_num_args (stmt); ++i) | |
2975 | if (REFERENCE_CLASS_P (gimple_call_arg (stmt, i))) | |
2976 | { | |
2977 | tree tmp = maybe_fold_reference (gimple_call_arg (stmt, i), false); | |
2978 | if (tmp) | |
2979 | { | |
2980 | gimple_call_set_arg (stmt, i, tmp); | |
2981 | changed = true; | |
2982 | } | |
2983 | } | |
3b45a007 RG |
2984 | |
2985 | /* Check for virtual calls that became direct calls. */ | |
2986 | callee = gimple_call_fn (stmt); | |
25583c4f | 2987 | if (callee && TREE_CODE (callee) == OBJ_TYPE_REF) |
3b45a007 | 2988 | { |
49c471e3 MJ |
2989 | if (gimple_call_addr_fndecl (OBJ_TYPE_REF_EXPR (callee)) != NULL_TREE) |
2990 | { | |
450ad0cd JH |
2991 | if (dump_file && virtual_method_call_p (callee) |
2992 | && !possible_polymorphic_call_target_p | |
6f8091fc JH |
2993 | (callee, stmt, cgraph_node::get (gimple_call_addr_fndecl |
2994 | (OBJ_TYPE_REF_EXPR (callee))))) | |
450ad0cd JH |
2995 | { |
2996 | fprintf (dump_file, | |
a70e9985 | 2997 | "Type inheritance inconsistent devirtualization of "); |
450ad0cd JH |
2998 | print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); |
2999 | fprintf (dump_file, " to "); | |
3000 | print_generic_expr (dump_file, callee, TDF_SLIM); | |
3001 | fprintf (dump_file, "\n"); | |
3002 | } | |
3003 | ||
49c471e3 | 3004 | gimple_call_set_fn (stmt, OBJ_TYPE_REF_EXPR (callee)); |
e021c122 RG |
3005 | changed = true; |
3006 | } | |
a70e9985 | 3007 | else if (flag_devirtualize && !inplace && virtual_method_call_p (callee)) |
e021c122 | 3008 | { |
61dd6a2e JH |
3009 | bool final; |
3010 | vec <cgraph_node *>targets | |
058d0a90 | 3011 | = possible_polymorphic_call_targets (callee, stmt, &final); |
2b5f0895 | 3012 | if (final && targets.length () <= 1 && dbg_cnt (devirt)) |
e021c122 | 3013 | { |
a70e9985 | 3014 | tree lhs = gimple_call_lhs (stmt); |
2b5f0895 XDL |
3015 | if (dump_enabled_p ()) |
3016 | { | |
807b7d62 | 3017 | location_t loc = gimple_location_safe (stmt); |
2b5f0895 XDL |
3018 | dump_printf_loc (MSG_OPTIMIZED_LOCATIONS, loc, |
3019 | "folding virtual function call to %s\n", | |
3020 | targets.length () == 1 | |
3021 | ? targets[0]->name () | |
3022 | : "__builtin_unreachable"); | |
3023 | } | |
61dd6a2e | 3024 | if (targets.length () == 1) |
cf3e5a89 JJ |
3025 | { |
3026 | gimple_call_set_fndecl (stmt, targets[0]->decl); | |
3027 | changed = true; | |
a70e9985 JJ |
3028 | /* If the call becomes noreturn, remove the lhs. */ |
3029 | if (lhs && (gimple_call_flags (stmt) & ECF_NORETURN)) | |
3030 | { | |
3031 | if (TREE_CODE (lhs) == SSA_NAME) | |
3032 | { | |
b731b390 | 3033 | tree var = create_tmp_var (TREE_TYPE (lhs)); |
a70e9985 JJ |
3034 | tree def = get_or_create_ssa_default_def (cfun, var); |
3035 | gimple new_stmt = gimple_build_assign (lhs, def); | |
3036 | gsi_insert_before (gsi, new_stmt, GSI_SAME_STMT); | |
3037 | } | |
3038 | gimple_call_set_lhs (stmt, NULL_TREE); | |
3039 | } | |
cf3e5a89 | 3040 | } |
a70e9985 | 3041 | else |
cf3e5a89 JJ |
3042 | { |
3043 | tree fndecl = builtin_decl_implicit (BUILT_IN_UNREACHABLE); | |
3044 | gimple new_stmt = gimple_build_call (fndecl, 0); | |
3045 | gimple_set_location (new_stmt, gimple_location (stmt)); | |
a70e9985 JJ |
3046 | if (lhs && TREE_CODE (lhs) == SSA_NAME) |
3047 | { | |
b731b390 | 3048 | tree var = create_tmp_var (TREE_TYPE (lhs)); |
a70e9985 | 3049 | tree def = get_or_create_ssa_default_def (cfun, var); |
eb14a79f ML |
3050 | |
3051 | /* To satisfy condition for | |
3052 | cgraph_update_edges_for_call_stmt_node, | |
3053 | we need to preserve GIMPLE_CALL statement | |
3054 | at position of GSI iterator. */ | |
a70e9985 | 3055 | update_call_from_tree (gsi, def); |
eb14a79f | 3056 | gsi_insert_before (gsi, new_stmt, GSI_NEW_STMT); |
a70e9985 JJ |
3057 | } |
3058 | else | |
42e52a51 RB |
3059 | { |
3060 | gimple_set_vuse (new_stmt, gimple_vuse (stmt)); | |
3061 | gimple_set_vdef (new_stmt, gimple_vdef (stmt)); | |
3062 | gsi_replace (gsi, new_stmt, false); | |
3063 | } | |
cf3e5a89 JJ |
3064 | return true; |
3065 | } | |
e021c122 | 3066 | } |
49c471e3 | 3067 | } |
e021c122 | 3068 | } |
49c471e3 | 3069 | |
f2d3d07e RH |
3070 | /* Check for indirect calls that became direct calls, and then |
3071 | no longer require a static chain. */ | |
3072 | if (gimple_call_chain (stmt)) | |
3073 | { | |
3074 | tree fn = gimple_call_fndecl (stmt); | |
3075 | if (fn && !DECL_STATIC_CHAIN (fn)) | |
3076 | { | |
3077 | gimple_call_set_chain (stmt, NULL); | |
3078 | changed = true; | |
3079 | } | |
3080 | else | |
3081 | { | |
3082 | tree tmp = maybe_fold_reference (gimple_call_chain (stmt), false); | |
3083 | if (tmp) | |
3084 | { | |
3085 | gimple_call_set_chain (stmt, tmp); | |
3086 | changed = true; | |
3087 | } | |
3088 | } | |
3089 | } | |
3090 | ||
e021c122 RG |
3091 | if (inplace) |
3092 | return changed; | |
3093 | ||
3094 | /* Check for builtins that CCP can handle using information not | |
3095 | available in the generic fold routines. */ | |
fef5a0d9 RB |
3096 | if (gimple_call_builtin_p (stmt, BUILT_IN_NORMAL)) |
3097 | { | |
3098 | if (gimple_fold_builtin (gsi)) | |
3099 | changed = true; | |
3100 | } | |
3101 | else if (gimple_call_builtin_p (stmt, BUILT_IN_MD)) | |
e021c122 | 3102 | { |
ea679d55 | 3103 | changed |= targetm.gimple_fold_builtin (gsi); |
3b45a007 | 3104 | } |
368b454d | 3105 | else if (gimple_call_internal_p (stmt)) |
ed9c79e1 | 3106 | { |
368b454d JJ |
3107 | enum tree_code subcode = ERROR_MARK; |
3108 | tree result = NULL_TREE; | |
1304953e JJ |
3109 | bool cplx_result = false; |
3110 | tree overflow = NULL_TREE; | |
368b454d JJ |
3111 | switch (gimple_call_internal_fn (stmt)) |
3112 | { | |
3113 | case IFN_BUILTIN_EXPECT: | |
3114 | result = fold_builtin_expect (gimple_location (stmt), | |
3115 | gimple_call_arg (stmt, 0), | |
3116 | gimple_call_arg (stmt, 1), | |
3117 | gimple_call_arg (stmt, 2)); | |
3118 | break; | |
0e82f089 MP |
3119 | case IFN_UBSAN_OBJECT_SIZE: |
3120 | if (integer_all_onesp (gimple_call_arg (stmt, 2)) | |
3121 | || (TREE_CODE (gimple_call_arg (stmt, 1)) == INTEGER_CST | |
3122 | && TREE_CODE (gimple_call_arg (stmt, 2)) == INTEGER_CST | |
3123 | && tree_int_cst_le (gimple_call_arg (stmt, 1), | |
3124 | gimple_call_arg (stmt, 2)))) | |
3125 | { | |
3126 | gsi_replace (gsi, gimple_build_nop (), true); | |
3127 | unlink_stmt_vdef (stmt); | |
3128 | release_defs (stmt); | |
3129 | return true; | |
3130 | } | |
3131 | break; | |
368b454d JJ |
3132 | case IFN_UBSAN_CHECK_ADD: |
3133 | subcode = PLUS_EXPR; | |
3134 | break; | |
3135 | case IFN_UBSAN_CHECK_SUB: | |
3136 | subcode = MINUS_EXPR; | |
3137 | break; | |
3138 | case IFN_UBSAN_CHECK_MUL: | |
3139 | subcode = MULT_EXPR; | |
3140 | break; | |
1304953e JJ |
3141 | case IFN_ADD_OVERFLOW: |
3142 | subcode = PLUS_EXPR; | |
3143 | cplx_result = true; | |
3144 | break; | |
3145 | case IFN_SUB_OVERFLOW: | |
3146 | subcode = MINUS_EXPR; | |
3147 | cplx_result = true; | |
3148 | break; | |
3149 | case IFN_MUL_OVERFLOW: | |
3150 | subcode = MULT_EXPR; | |
3151 | cplx_result = true; | |
3152 | break; | |
368b454d JJ |
3153 | default: |
3154 | break; | |
3155 | } | |
3156 | if (subcode != ERROR_MARK) | |
3157 | { | |
3158 | tree arg0 = gimple_call_arg (stmt, 0); | |
3159 | tree arg1 = gimple_call_arg (stmt, 1); | |
1304953e JJ |
3160 | tree type = TREE_TYPE (arg0); |
3161 | if (cplx_result) | |
3162 | { | |
3163 | tree lhs = gimple_call_lhs (stmt); | |
3164 | if (lhs == NULL_TREE) | |
3165 | type = NULL_TREE; | |
3166 | else | |
3167 | type = TREE_TYPE (TREE_TYPE (lhs)); | |
3168 | } | |
3169 | if (type == NULL_TREE) | |
3170 | ; | |
368b454d | 3171 | /* x = y + 0; x = y - 0; x = y * 0; */ |
1304953e JJ |
3172 | else if (integer_zerop (arg1)) |
3173 | result = subcode == MULT_EXPR ? integer_zero_node : arg0; | |
368b454d JJ |
3174 | /* x = 0 + y; x = 0 * y; */ |
3175 | else if (subcode != MINUS_EXPR && integer_zerop (arg0)) | |
1304953e | 3176 | result = subcode == MULT_EXPR ? integer_zero_node : arg1; |
368b454d JJ |
3177 | /* x = y - y; */ |
3178 | else if (subcode == MINUS_EXPR && operand_equal_p (arg0, arg1, 0)) | |
1304953e | 3179 | result = integer_zero_node; |
368b454d | 3180 | /* x = y * 1; x = 1 * y; */ |
1304953e JJ |
3181 | else if (subcode == MULT_EXPR && integer_onep (arg1)) |
3182 | result = arg0; | |
3183 | else if (subcode == MULT_EXPR && integer_onep (arg0)) | |
3184 | result = arg1; | |
3185 | else if (TREE_CODE (arg0) == INTEGER_CST | |
3186 | && TREE_CODE (arg1) == INTEGER_CST) | |
368b454d | 3187 | { |
1304953e JJ |
3188 | if (cplx_result) |
3189 | result = int_const_binop (subcode, fold_convert (type, arg0), | |
3190 | fold_convert (type, arg1)); | |
3191 | else | |
3192 | result = int_const_binop (subcode, arg0, arg1); | |
3193 | if (result && arith_overflowed_p (subcode, type, arg0, arg1)) | |
3194 | { | |
3195 | if (cplx_result) | |
3196 | overflow = build_one_cst (type); | |
3197 | else | |
3198 | result = NULL_TREE; | |
3199 | } | |
3200 | } | |
3201 | if (result) | |
3202 | { | |
3203 | if (result == integer_zero_node) | |
3204 | result = build_zero_cst (type); | |
3205 | else if (cplx_result && TREE_TYPE (result) != type) | |
3206 | { | |
3207 | if (TREE_CODE (result) == INTEGER_CST) | |
3208 | { | |
3209 | if (arith_overflowed_p (PLUS_EXPR, type, result, | |
3210 | integer_zero_node)) | |
3211 | overflow = build_one_cst (type); | |
3212 | } | |
3213 | else if ((!TYPE_UNSIGNED (TREE_TYPE (result)) | |
3214 | && TYPE_UNSIGNED (type)) | |
3215 | || (TYPE_PRECISION (type) | |
3216 | < (TYPE_PRECISION (TREE_TYPE (result)) | |
3217 | + (TYPE_UNSIGNED (TREE_TYPE (result)) | |
3218 | && !TYPE_UNSIGNED (type))))) | |
3219 | result = NULL_TREE; | |
3220 | if (result) | |
3221 | result = fold_convert (type, result); | |
3222 | } | |
368b454d JJ |
3223 | } |
3224 | } | |
1304953e | 3225 | |
ed9c79e1 JJ |
3226 | if (result) |
3227 | { | |
1304953e JJ |
3228 | if (TREE_CODE (result) == INTEGER_CST && TREE_OVERFLOW (result)) |
3229 | result = drop_tree_overflow (result); | |
3230 | if (cplx_result) | |
3231 | { | |
3232 | if (overflow == NULL_TREE) | |
3233 | overflow = build_zero_cst (TREE_TYPE (result)); | |
3234 | tree ctype = build_complex_type (TREE_TYPE (result)); | |
3235 | if (TREE_CODE (result) == INTEGER_CST | |
3236 | && TREE_CODE (overflow) == INTEGER_CST) | |
3237 | result = build_complex (ctype, result, overflow); | |
3238 | else | |
3239 | result = build2_loc (gimple_location (stmt), COMPLEX_EXPR, | |
3240 | ctype, result, overflow); | |
3241 | } | |
ed9c79e1 JJ |
3242 | if (!update_call_from_tree (gsi, result)) |
3243 | gimplify_and_update_call_from_tree (gsi, result); | |
3244 | changed = true; | |
3245 | } | |
3246 | } | |
3b45a007 | 3247 | |
e021c122 | 3248 | return changed; |
cbdd87d4 RG |
3249 | } |
3250 | ||
e0ee10ed RB |
3251 | |
3252 | /* Worker for fold_stmt_1 dispatch to pattern based folding with | |
3253 | gimple_simplify. | |
3254 | ||
3255 | Replaces *GSI with the simplification result in RCODE and OPS | |
3256 | and the associated statements in *SEQ. Does the replacement | |
3257 | according to INPLACE and returns true if the operation succeeded. */ | |
3258 | ||
3259 | static bool | |
3260 | replace_stmt_with_simplification (gimple_stmt_iterator *gsi, | |
3261 | code_helper rcode, tree *ops, | |
3262 | gimple_seq *seq, bool inplace) | |
3263 | { | |
3264 | gimple stmt = gsi_stmt (*gsi); | |
3265 | ||
3266 | /* Play safe and do not allow abnormals to be mentioned in | |
3267 | newly created statements. See also maybe_push_res_to_seq. */ | |
3268 | if ((TREE_CODE (ops[0]) == SSA_NAME | |
3269 | && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (ops[0])) | |
3270 | || (ops[1] | |
3271 | && TREE_CODE (ops[1]) == SSA_NAME | |
3272 | && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (ops[1])) | |
3273 | || (ops[2] | |
3274 | && TREE_CODE (ops[2]) == SSA_NAME | |
3275 | && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (ops[2]))) | |
3276 | return false; | |
3277 | ||
538dd0b7 | 3278 | if (gcond *cond_stmt = dyn_cast <gcond *> (stmt)) |
e0ee10ed RB |
3279 | { |
3280 | gcc_assert (rcode.is_tree_code ()); | |
3281 | if (TREE_CODE_CLASS ((enum tree_code)rcode) == tcc_comparison | |
3282 | /* GIMPLE_CONDs condition may not throw. */ | |
3283 | && (!flag_exceptions | |
3284 | || !cfun->can_throw_non_call_exceptions | |
3285 | || !operation_could_trap_p (rcode, | |
3286 | FLOAT_TYPE_P (TREE_TYPE (ops[0])), | |
3287 | false, NULL_TREE))) | |
538dd0b7 | 3288 | gimple_cond_set_condition (cond_stmt, rcode, ops[0], ops[1]); |
e0ee10ed | 3289 | else if (rcode == SSA_NAME) |
538dd0b7 | 3290 | gimple_cond_set_condition (cond_stmt, NE_EXPR, ops[0], |
e0ee10ed RB |
3291 | build_zero_cst (TREE_TYPE (ops[0]))); |
3292 | else if (rcode == INTEGER_CST) | |
3293 | { | |
3294 | if (integer_zerop (ops[0])) | |
538dd0b7 | 3295 | gimple_cond_make_false (cond_stmt); |
e0ee10ed | 3296 | else |
538dd0b7 | 3297 | gimple_cond_make_true (cond_stmt); |
e0ee10ed RB |
3298 | } |
3299 | else if (!inplace) | |
3300 | { | |
3301 | tree res = maybe_push_res_to_seq (rcode, boolean_type_node, | |
3302 | ops, seq); | |
3303 | if (!res) | |
3304 | return false; | |
538dd0b7 | 3305 | gimple_cond_set_condition (cond_stmt, NE_EXPR, res, |
e0ee10ed RB |
3306 | build_zero_cst (TREE_TYPE (res))); |
3307 | } | |
3308 | else | |
3309 | return false; | |
3310 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
3311 | { | |
3312 | fprintf (dump_file, "gimple_simplified to "); | |
3313 | if (!gimple_seq_empty_p (*seq)) | |
3314 | print_gimple_seq (dump_file, *seq, 0, TDF_SLIM); | |
3315 | print_gimple_stmt (dump_file, gsi_stmt (*gsi), | |
3316 | 0, TDF_SLIM); | |
3317 | } | |
3318 | gsi_insert_seq_before (gsi, *seq, GSI_SAME_STMT); | |
3319 | return true; | |
3320 | } | |
3321 | else if (is_gimple_assign (stmt) | |
3322 | && rcode.is_tree_code ()) | |
3323 | { | |
3324 | if (!inplace | |
f3582e54 | 3325 | || gimple_num_ops (stmt) > get_gimple_rhs_num_ops (rcode)) |
e0ee10ed RB |
3326 | { |
3327 | maybe_build_generic_op (rcode, | |
3328 | TREE_TYPE (gimple_assign_lhs (stmt)), | |
3329 | &ops[0], ops[1], ops[2]); | |
00d66391 | 3330 | gimple_assign_set_rhs_with_ops (gsi, rcode, ops[0], ops[1], ops[2]); |
e0ee10ed RB |
3331 | if (dump_file && (dump_flags & TDF_DETAILS)) |
3332 | { | |
3333 | fprintf (dump_file, "gimple_simplified to "); | |
3334 | if (!gimple_seq_empty_p (*seq)) | |
3335 | print_gimple_seq (dump_file, *seq, 0, TDF_SLIM); | |
3336 | print_gimple_stmt (dump_file, gsi_stmt (*gsi), | |
3337 | 0, TDF_SLIM); | |
3338 | } | |
3339 | gsi_insert_seq_before (gsi, *seq, GSI_SAME_STMT); | |
3340 | return true; | |
3341 | } | |
3342 | } | |
3343 | else if (!inplace) | |
3344 | { | |
3345 | if (gimple_has_lhs (stmt)) | |
3346 | { | |
3347 | tree lhs = gimple_get_lhs (stmt); | |
de665bbd RB |
3348 | if (!maybe_push_res_to_seq (rcode, TREE_TYPE (lhs), |
3349 | ops, seq, lhs)) | |
3350 | return false; | |
e0ee10ed RB |
3351 | if (dump_file && (dump_flags & TDF_DETAILS)) |
3352 | { | |
3353 | fprintf (dump_file, "gimple_simplified to "); | |
3354 | print_gimple_seq (dump_file, *seq, 0, TDF_SLIM); | |
3355 | } | |
3356 | gsi_replace_with_seq_vops (gsi, *seq); | |
3357 | return true; | |
3358 | } | |
3359 | else | |
3360 | gcc_unreachable (); | |
3361 | } | |
3362 | ||
3363 | return false; | |
3364 | } | |
3365 | ||
040292e7 RB |
3366 | /* Canonicalize MEM_REFs invariant address operand after propagation. */ |
3367 | ||
3368 | static bool | |
3369 | maybe_canonicalize_mem_ref_addr (tree *t) | |
3370 | { | |
3371 | bool res = false; | |
3372 | ||
3373 | if (TREE_CODE (*t) == ADDR_EXPR) | |
3374 | t = &TREE_OPERAND (*t, 0); | |
3375 | ||
3376 | while (handled_component_p (*t)) | |
3377 | t = &TREE_OPERAND (*t, 0); | |
3378 | ||
3379 | /* Canonicalize MEM [&foo.bar, 0] which appears after propagating | |
3380 | of invariant addresses into a SSA name MEM_REF address. */ | |
3381 | if (TREE_CODE (*t) == MEM_REF | |
3382 | || TREE_CODE (*t) == TARGET_MEM_REF) | |
3383 | { | |
3384 | tree addr = TREE_OPERAND (*t, 0); | |
3385 | if (TREE_CODE (addr) == ADDR_EXPR | |
3386 | && (TREE_CODE (TREE_OPERAND (addr, 0)) == MEM_REF | |
3387 | || handled_component_p (TREE_OPERAND (addr, 0)))) | |
3388 | { | |
3389 | tree base; | |
3390 | HOST_WIDE_INT coffset; | |
3391 | base = get_addr_base_and_unit_offset (TREE_OPERAND (addr, 0), | |
3392 | &coffset); | |
3393 | if (!base) | |
3394 | gcc_unreachable (); | |
3395 | ||
3396 | TREE_OPERAND (*t, 0) = build_fold_addr_expr (base); | |
3397 | TREE_OPERAND (*t, 1) = int_const_binop (PLUS_EXPR, | |
3398 | TREE_OPERAND (*t, 1), | |
3399 | size_int (coffset)); | |
3400 | res = true; | |
3401 | } | |
3402 | gcc_checking_assert (TREE_CODE (TREE_OPERAND (*t, 0)) == DEBUG_EXPR_DECL | |
3403 | || is_gimple_mem_ref_addr (TREE_OPERAND (*t, 0))); | |
3404 | } | |
3405 | ||
3406 | /* Canonicalize back MEM_REFs to plain reference trees if the object | |
3407 | accessed is a decl that has the same access semantics as the MEM_REF. */ | |
3408 | if (TREE_CODE (*t) == MEM_REF | |
3409 | && TREE_CODE (TREE_OPERAND (*t, 0)) == ADDR_EXPR | |
f3dccf50 RB |
3410 | && integer_zerop (TREE_OPERAND (*t, 1)) |
3411 | && MR_DEPENDENCE_CLIQUE (*t) == 0) | |
040292e7 RB |
3412 | { |
3413 | tree decl = TREE_OPERAND (TREE_OPERAND (*t, 0), 0); | |
3414 | tree alias_type = TREE_TYPE (TREE_OPERAND (*t, 1)); | |
3415 | if (/* Same volatile qualification. */ | |
3416 | TREE_THIS_VOLATILE (*t) == TREE_THIS_VOLATILE (decl) | |
3417 | /* Same TBAA behavior with -fstrict-aliasing. */ | |
3418 | && !TYPE_REF_CAN_ALIAS_ALL (alias_type) | |
3419 | && (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) | |
3420 | == TYPE_MAIN_VARIANT (TREE_TYPE (alias_type))) | |
3421 | /* Same alignment. */ | |
3422 | && TYPE_ALIGN (TREE_TYPE (decl)) == TYPE_ALIGN (TREE_TYPE (*t)) | |
3423 | /* We have to look out here to not drop a required conversion | |
3424 | from the rhs to the lhs if *t appears on the lhs or vice-versa | |
3425 | if it appears on the rhs. Thus require strict type | |
3426 | compatibility. */ | |
3427 | && types_compatible_p (TREE_TYPE (*t), TREE_TYPE (decl))) | |
3428 | { | |
3429 | *t = TREE_OPERAND (TREE_OPERAND (*t, 0), 0); | |
3430 | res = true; | |
3431 | } | |
3432 | } | |
3433 | ||
3434 | /* Canonicalize TARGET_MEM_REF in particular with respect to | |
3435 | the indexes becoming constant. */ | |
3436 | else if (TREE_CODE (*t) == TARGET_MEM_REF) | |
3437 | { | |
3438 | tree tem = maybe_fold_tmr (*t); | |
3439 | if (tem) | |
3440 | { | |
3441 | *t = tem; | |
3442 | res = true; | |
3443 | } | |
3444 | } | |
3445 | ||
3446 | return res; | |
3447 | } | |
3448 | ||
cbdd87d4 RG |
3449 | /* Worker for both fold_stmt and fold_stmt_inplace. The INPLACE argument |
3450 | distinguishes both cases. */ | |
3451 | ||
3452 | static bool | |
e0ee10ed | 3453 | fold_stmt_1 (gimple_stmt_iterator *gsi, bool inplace, tree (*valueize) (tree)) |
cbdd87d4 RG |
3454 | { |
3455 | bool changed = false; | |
3456 | gimple stmt = gsi_stmt (*gsi); | |
3457 | unsigned i; | |
3458 | ||
040292e7 RB |
3459 | /* First do required canonicalization of [TARGET_]MEM_REF addresses |
3460 | after propagation. | |
3461 | ??? This shouldn't be done in generic folding but in the | |
3462 | propagation helpers which also know whether an address was | |
3463 | propagated. */ | |
3464 | switch (gimple_code (stmt)) | |
3465 | { | |
3466 | case GIMPLE_ASSIGN: | |
3467 | if (gimple_assign_rhs_class (stmt) == GIMPLE_SINGLE_RHS) | |
3468 | { | |
3469 | tree *rhs = gimple_assign_rhs1_ptr (stmt); | |
3470 | if ((REFERENCE_CLASS_P (*rhs) | |
3471 | || TREE_CODE (*rhs) == ADDR_EXPR) | |
3472 | && maybe_canonicalize_mem_ref_addr (rhs)) | |
3473 | changed = true; | |
3474 | tree *lhs = gimple_assign_lhs_ptr (stmt); | |
3475 | if (REFERENCE_CLASS_P (*lhs) | |
3476 | && maybe_canonicalize_mem_ref_addr (lhs)) | |
3477 | changed = true; | |
3478 | } | |
3479 | break; | |
3480 | case GIMPLE_CALL: | |
3481 | { | |
3482 | for (i = 0; i < gimple_call_num_args (stmt); ++i) | |
3483 | { | |
3484 | tree *arg = gimple_call_arg_ptr (stmt, i); | |
3485 | if (REFERENCE_CLASS_P (*arg) | |
3486 | && maybe_canonicalize_mem_ref_addr (arg)) | |
3487 | changed = true; | |
3488 | } | |
3489 | tree *lhs = gimple_call_lhs_ptr (stmt); | |
3490 | if (*lhs | |
3491 | && REFERENCE_CLASS_P (*lhs) | |
3492 | && maybe_canonicalize_mem_ref_addr (lhs)) | |
3493 | changed = true; | |
3494 | break; | |
3495 | } | |
3496 | case GIMPLE_ASM: | |
3497 | { | |
538dd0b7 DM |
3498 | gasm *asm_stmt = as_a <gasm *> (stmt); |
3499 | for (i = 0; i < gimple_asm_noutputs (asm_stmt); ++i) | |
040292e7 | 3500 | { |
538dd0b7 | 3501 | tree link = gimple_asm_output_op (asm_stmt, i); |
040292e7 RB |
3502 | tree op = TREE_VALUE (link); |
3503 | if (REFERENCE_CLASS_P (op) | |
3504 | && maybe_canonicalize_mem_ref_addr (&TREE_VALUE (link))) | |
3505 | changed = true; | |
3506 | } | |
538dd0b7 | 3507 | for (i = 0; i < gimple_asm_ninputs (asm_stmt); ++i) |
040292e7 | 3508 | { |
538dd0b7 | 3509 | tree link = gimple_asm_input_op (asm_stmt, i); |
040292e7 RB |
3510 | tree op = TREE_VALUE (link); |
3511 | if ((REFERENCE_CLASS_P (op) | |
3512 | || TREE_CODE (op) == ADDR_EXPR) | |
3513 | && maybe_canonicalize_mem_ref_addr (&TREE_VALUE (link))) | |
3514 | changed = true; | |
3515 | } | |
3516 | } | |
3517 | break; | |
3518 | case GIMPLE_DEBUG: | |
3519 | if (gimple_debug_bind_p (stmt)) | |
3520 | { | |
3521 | tree *val = gimple_debug_bind_get_value_ptr (stmt); | |
3522 | if (*val | |
3523 | && (REFERENCE_CLASS_P (*val) | |
3524 | || TREE_CODE (*val) == ADDR_EXPR) | |
3525 | && maybe_canonicalize_mem_ref_addr (val)) | |
3526 | changed = true; | |
3527 | } | |
3528 | break; | |
3529 | default:; | |
3530 | } | |
3531 | ||
e0ee10ed RB |
3532 | /* Dispatch to pattern-based folding. */ |
3533 | if (!inplace | |
3534 | || is_gimple_assign (stmt) | |
3535 | || gimple_code (stmt) == GIMPLE_COND) | |
3536 | { | |
3537 | gimple_seq seq = NULL; | |
3538 | code_helper rcode; | |
3539 | tree ops[3] = {}; | |
3540 | if (gimple_simplify (stmt, &rcode, ops, inplace ? NULL : &seq, valueize)) | |
3541 | { | |
3542 | if (replace_stmt_with_simplification (gsi, rcode, ops, &seq, inplace)) | |
3543 | changed = true; | |
3544 | else | |
3545 | gimple_seq_discard (seq); | |
3546 | } | |
3547 | } | |
3548 | ||
3549 | stmt = gsi_stmt (*gsi); | |
3550 | ||
cbdd87d4 RG |
3551 | /* Fold the main computation performed by the statement. */ |
3552 | switch (gimple_code (stmt)) | |
3553 | { | |
3554 | case GIMPLE_ASSIGN: | |
3555 | { | |
3556 | unsigned old_num_ops = gimple_num_ops (stmt); | |
5fbcc0ed | 3557 | enum tree_code subcode = gimple_assign_rhs_code (stmt); |
cbdd87d4 | 3558 | tree lhs = gimple_assign_lhs (stmt); |
5fbcc0ed RG |
3559 | tree new_rhs; |
3560 | /* First canonicalize operand order. This avoids building new | |
3561 | trees if this is the only thing fold would later do. */ | |
3562 | if ((commutative_tree_code (subcode) | |
3563 | || commutative_ternary_tree_code (subcode)) | |
3564 | && tree_swap_operands_p (gimple_assign_rhs1 (stmt), | |
3565 | gimple_assign_rhs2 (stmt), false)) | |
3566 | { | |
3567 | tree tem = gimple_assign_rhs1 (stmt); | |
3568 | gimple_assign_set_rhs1 (stmt, gimple_assign_rhs2 (stmt)); | |
3569 | gimple_assign_set_rhs2 (stmt, tem); | |
3570 | changed = true; | |
3571 | } | |
3572 | new_rhs = fold_gimple_assign (gsi); | |
cbdd87d4 RG |
3573 | if (new_rhs |
3574 | && !useless_type_conversion_p (TREE_TYPE (lhs), | |
3575 | TREE_TYPE (new_rhs))) | |
3576 | new_rhs = fold_convert (TREE_TYPE (lhs), new_rhs); | |
3577 | if (new_rhs | |
3578 | && (!inplace | |
3579 | || get_gimple_rhs_num_ops (TREE_CODE (new_rhs)) < old_num_ops)) | |
3580 | { | |
3581 | gimple_assign_set_rhs_from_tree (gsi, new_rhs); | |
3582 | changed = true; | |
3583 | } | |
3584 | break; | |
3585 | } | |
3586 | ||
3587 | case GIMPLE_COND: | |
538dd0b7 | 3588 | changed |= fold_gimple_cond (as_a <gcond *> (stmt)); |
cbdd87d4 RG |
3589 | break; |
3590 | ||
3591 | case GIMPLE_CALL: | |
ceeffab0 | 3592 | changed |= gimple_fold_call (gsi, inplace); |
cbdd87d4 RG |
3593 | break; |
3594 | ||
3595 | case GIMPLE_ASM: | |
3596 | /* Fold *& in asm operands. */ | |
38384150 | 3597 | { |
538dd0b7 | 3598 | gasm *asm_stmt = as_a <gasm *> (stmt); |
38384150 JJ |
3599 | size_t noutputs; |
3600 | const char **oconstraints; | |
3601 | const char *constraint; | |
3602 | bool allows_mem, allows_reg; | |
3603 | ||
538dd0b7 | 3604 | noutputs = gimple_asm_noutputs (asm_stmt); |
38384150 JJ |
3605 | oconstraints = XALLOCAVEC (const char *, noutputs); |
3606 | ||
538dd0b7 | 3607 | for (i = 0; i < gimple_asm_noutputs (asm_stmt); ++i) |
38384150 | 3608 | { |
538dd0b7 | 3609 | tree link = gimple_asm_output_op (asm_stmt, i); |
38384150 JJ |
3610 | tree op = TREE_VALUE (link); |
3611 | oconstraints[i] | |
3612 | = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link))); | |
3613 | if (REFERENCE_CLASS_P (op) | |
3614 | && (op = maybe_fold_reference (op, true)) != NULL_TREE) | |
3615 | { | |
3616 | TREE_VALUE (link) = op; | |
3617 | changed = true; | |
3618 | } | |
3619 | } | |
538dd0b7 | 3620 | for (i = 0; i < gimple_asm_ninputs (asm_stmt); ++i) |
38384150 | 3621 | { |
538dd0b7 | 3622 | tree link = gimple_asm_input_op (asm_stmt, i); |
38384150 JJ |
3623 | tree op = TREE_VALUE (link); |
3624 | constraint | |
3625 | = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link))); | |
3626 | parse_input_constraint (&constraint, 0, 0, noutputs, 0, | |
3627 | oconstraints, &allows_mem, &allows_reg); | |
3628 | if (REFERENCE_CLASS_P (op) | |
3629 | && (op = maybe_fold_reference (op, !allows_reg && allows_mem)) | |
3630 | != NULL_TREE) | |
3631 | { | |
3632 | TREE_VALUE (link) = op; | |
3633 | changed = true; | |
3634 | } | |
3635 | } | |
3636 | } | |
cbdd87d4 RG |
3637 | break; |
3638 | ||
bd422c4a RG |
3639 | case GIMPLE_DEBUG: |
3640 | if (gimple_debug_bind_p (stmt)) | |
3641 | { | |
3642 | tree val = gimple_debug_bind_get_value (stmt); | |
3643 | if (val | |
3644 | && REFERENCE_CLASS_P (val)) | |
3645 | { | |
3646 | tree tem = maybe_fold_reference (val, false); | |
3647 | if (tem) | |
3648 | { | |
3649 | gimple_debug_bind_set_value (stmt, tem); | |
3650 | changed = true; | |
3651 | } | |
3652 | } | |
3e888a5e RG |
3653 | else if (val |
3654 | && TREE_CODE (val) == ADDR_EXPR) | |
3655 | { | |
3656 | tree ref = TREE_OPERAND (val, 0); | |
3657 | tree tem = maybe_fold_reference (ref, false); | |
3658 | if (tem) | |
3659 | { | |
3660 | tem = build_fold_addr_expr_with_type (tem, TREE_TYPE (val)); | |
3661 | gimple_debug_bind_set_value (stmt, tem); | |
3662 | changed = true; | |
3663 | } | |
3664 | } | |
bd422c4a RG |
3665 | } |
3666 | break; | |
3667 | ||
cbdd87d4 RG |
3668 | default:; |
3669 | } | |
3670 | ||
3671 | stmt = gsi_stmt (*gsi); | |
3672 | ||
37376165 RB |
3673 | /* Fold *& on the lhs. */ |
3674 | if (gimple_has_lhs (stmt)) | |
cbdd87d4 RG |
3675 | { |
3676 | tree lhs = gimple_get_lhs (stmt); | |
3677 | if (lhs && REFERENCE_CLASS_P (lhs)) | |
3678 | { | |
3679 | tree new_lhs = maybe_fold_reference (lhs, true); | |
3680 | if (new_lhs) | |
3681 | { | |
3682 | gimple_set_lhs (stmt, new_lhs); | |
3683 | changed = true; | |
3684 | } | |
3685 | } | |
3686 | } | |
3687 | ||
3688 | return changed; | |
3689 | } | |
3690 | ||
e0ee10ed RB |
3691 | /* Valueziation callback that ends up not following SSA edges. */ |
3692 | ||
3693 | tree | |
3694 | no_follow_ssa_edges (tree) | |
3695 | { | |
3696 | return NULL_TREE; | |
3697 | } | |
3698 | ||
45cc9f96 RB |
3699 | /* Valueization callback that ends up following single-use SSA edges only. */ |
3700 | ||
3701 | tree | |
3702 | follow_single_use_edges (tree val) | |
3703 | { | |
3704 | if (TREE_CODE (val) == SSA_NAME | |
3705 | && !has_single_use (val)) | |
3706 | return NULL_TREE; | |
3707 | return val; | |
3708 | } | |
3709 | ||
cbdd87d4 RG |
3710 | /* Fold the statement pointed to by GSI. In some cases, this function may |
3711 | replace the whole statement with a new one. Returns true iff folding | |
3712 | makes any changes. | |
3713 | The statement pointed to by GSI should be in valid gimple form but may | |
3714 | be in unfolded state as resulting from for example constant propagation | |
3715 | which can produce *&x = 0. */ | |
3716 | ||
3717 | bool | |
3718 | fold_stmt (gimple_stmt_iterator *gsi) | |
3719 | { | |
e0ee10ed RB |
3720 | return fold_stmt_1 (gsi, false, no_follow_ssa_edges); |
3721 | } | |
3722 | ||
3723 | bool | |
3724 | fold_stmt (gimple_stmt_iterator *gsi, tree (*valueize) (tree)) | |
3725 | { | |
3726 | return fold_stmt_1 (gsi, false, valueize); | |
cbdd87d4 RG |
3727 | } |
3728 | ||
59401b92 | 3729 | /* Perform the minimal folding on statement *GSI. Only operations like |
cbdd87d4 RG |
3730 | *&x created by constant propagation are handled. The statement cannot |
3731 | be replaced with a new one. Return true if the statement was | |
3732 | changed, false otherwise. | |
59401b92 | 3733 | The statement *GSI should be in valid gimple form but may |
cbdd87d4 RG |
3734 | be in unfolded state as resulting from for example constant propagation |
3735 | which can produce *&x = 0. */ | |
3736 | ||
3737 | bool | |
59401b92 | 3738 | fold_stmt_inplace (gimple_stmt_iterator *gsi) |
cbdd87d4 | 3739 | { |
59401b92 | 3740 | gimple stmt = gsi_stmt (*gsi); |
e0ee10ed | 3741 | bool changed = fold_stmt_1 (gsi, true, no_follow_ssa_edges); |
59401b92 | 3742 | gcc_assert (gsi_stmt (*gsi) == stmt); |
cbdd87d4 RG |
3743 | return changed; |
3744 | } | |
3745 | ||
e89065a1 SL |
3746 | /* Canonicalize and possibly invert the boolean EXPR; return NULL_TREE |
3747 | if EXPR is null or we don't know how. | |
3748 | If non-null, the result always has boolean type. */ | |
3749 | ||
3750 | static tree | |
3751 | canonicalize_bool (tree expr, bool invert) | |
3752 | { | |
3753 | if (!expr) | |
3754 | return NULL_TREE; | |
3755 | else if (invert) | |
3756 | { | |
3757 | if (integer_nonzerop (expr)) | |
3758 | return boolean_false_node; | |
3759 | else if (integer_zerop (expr)) | |
3760 | return boolean_true_node; | |
3761 | else if (TREE_CODE (expr) == SSA_NAME) | |
3762 | return fold_build2 (EQ_EXPR, boolean_type_node, expr, | |
3763 | build_int_cst (TREE_TYPE (expr), 0)); | |
3764 | else if (TREE_CODE_CLASS (TREE_CODE (expr)) == tcc_comparison) | |
3765 | return fold_build2 (invert_tree_comparison (TREE_CODE (expr), false), | |
3766 | boolean_type_node, | |
3767 | TREE_OPERAND (expr, 0), | |
3768 | TREE_OPERAND (expr, 1)); | |
3769 | else | |
3770 | return NULL_TREE; | |
3771 | } | |
3772 | else | |
3773 | { | |
3774 | if (TREE_CODE (TREE_TYPE (expr)) == BOOLEAN_TYPE) | |
3775 | return expr; | |
3776 | if (integer_nonzerop (expr)) | |
3777 | return boolean_true_node; | |
3778 | else if (integer_zerop (expr)) | |
3779 | return boolean_false_node; | |
3780 | else if (TREE_CODE (expr) == SSA_NAME) | |
3781 | return fold_build2 (NE_EXPR, boolean_type_node, expr, | |
3782 | build_int_cst (TREE_TYPE (expr), 0)); | |
3783 | else if (TREE_CODE_CLASS (TREE_CODE (expr)) == tcc_comparison) | |
3784 | return fold_build2 (TREE_CODE (expr), | |
3785 | boolean_type_node, | |
3786 | TREE_OPERAND (expr, 0), | |
3787 | TREE_OPERAND (expr, 1)); | |
3788 | else | |
3789 | return NULL_TREE; | |
3790 | } | |
3791 | } | |
3792 | ||
3793 | /* Check to see if a boolean expression EXPR is logically equivalent to the | |
3794 | comparison (OP1 CODE OP2). Check for various identities involving | |
3795 | SSA_NAMEs. */ | |
3796 | ||
3797 | static bool | |
3798 | same_bool_comparison_p (const_tree expr, enum tree_code code, | |
3799 | const_tree op1, const_tree op2) | |
3800 | { | |
3801 | gimple s; | |
3802 | ||
3803 | /* The obvious case. */ | |
3804 | if (TREE_CODE (expr) == code | |
3805 | && operand_equal_p (TREE_OPERAND (expr, 0), op1, 0) | |
3806 | && operand_equal_p (TREE_OPERAND (expr, 1), op2, 0)) | |
3807 | return true; | |
3808 | ||
3809 | /* Check for comparing (name, name != 0) and the case where expr | |
3810 | is an SSA_NAME with a definition matching the comparison. */ | |
3811 | if (TREE_CODE (expr) == SSA_NAME | |
3812 | && TREE_CODE (TREE_TYPE (expr)) == BOOLEAN_TYPE) | |
3813 | { | |
3814 | if (operand_equal_p (expr, op1, 0)) | |
3815 | return ((code == NE_EXPR && integer_zerop (op2)) | |
3816 | || (code == EQ_EXPR && integer_nonzerop (op2))); | |
3817 | s = SSA_NAME_DEF_STMT (expr); | |
3818 | if (is_gimple_assign (s) | |
3819 | && gimple_assign_rhs_code (s) == code | |
3820 | && operand_equal_p (gimple_assign_rhs1 (s), op1, 0) | |
3821 | && operand_equal_p (gimple_assign_rhs2 (s), op2, 0)) | |
3822 | return true; | |
3823 | } | |
3824 | ||
3825 | /* If op1 is of the form (name != 0) or (name == 0), and the definition | |
3826 | of name is a comparison, recurse. */ | |
3827 | if (TREE_CODE (op1) == SSA_NAME | |
3828 | && TREE_CODE (TREE_TYPE (op1)) == BOOLEAN_TYPE) | |
3829 | { | |
3830 | s = SSA_NAME_DEF_STMT (op1); | |
3831 | if (is_gimple_assign (s) | |
3832 | && TREE_CODE_CLASS (gimple_assign_rhs_code (s)) == tcc_comparison) | |
3833 | { | |
3834 | enum tree_code c = gimple_assign_rhs_code (s); | |
3835 | if ((c == NE_EXPR && integer_zerop (op2)) | |
3836 | || (c == EQ_EXPR && integer_nonzerop (op2))) | |
3837 | return same_bool_comparison_p (expr, c, | |
3838 | gimple_assign_rhs1 (s), | |
3839 | gimple_assign_rhs2 (s)); | |
3840 | if ((c == EQ_EXPR && integer_zerop (op2)) | |
3841 | || (c == NE_EXPR && integer_nonzerop (op2))) | |
3842 | return same_bool_comparison_p (expr, | |
3843 | invert_tree_comparison (c, false), | |
3844 | gimple_assign_rhs1 (s), | |
3845 | gimple_assign_rhs2 (s)); | |
3846 | } | |
3847 | } | |
3848 | return false; | |
3849 | } | |
3850 | ||
3851 | /* Check to see if two boolean expressions OP1 and OP2 are logically | |
3852 | equivalent. */ | |
3853 | ||
3854 | static bool | |
3855 | same_bool_result_p (const_tree op1, const_tree op2) | |
3856 | { | |
3857 | /* Simple cases first. */ | |
3858 | if (operand_equal_p (op1, op2, 0)) | |
3859 | return true; | |
3860 | ||
3861 | /* Check the cases where at least one of the operands is a comparison. | |
3862 | These are a bit smarter than operand_equal_p in that they apply some | |
3863 | identifies on SSA_NAMEs. */ | |
3864 | if (TREE_CODE_CLASS (TREE_CODE (op2)) == tcc_comparison | |
3865 | && same_bool_comparison_p (op1, TREE_CODE (op2), | |
3866 | TREE_OPERAND (op2, 0), | |
3867 | TREE_OPERAND (op2, 1))) | |
3868 | return true; | |
3869 | if (TREE_CODE_CLASS (TREE_CODE (op1)) == tcc_comparison | |
3870 | && same_bool_comparison_p (op2, TREE_CODE (op1), | |
3871 | TREE_OPERAND (op1, 0), | |
3872 | TREE_OPERAND (op1, 1))) | |
3873 | return true; | |
3874 | ||
3875 | /* Default case. */ | |
3876 | return false; | |
3877 | } | |
3878 | ||
3879 | /* Forward declarations for some mutually recursive functions. */ | |
3880 | ||
3881 | static tree | |
3882 | and_comparisons_1 (enum tree_code code1, tree op1a, tree op1b, | |
3883 | enum tree_code code2, tree op2a, tree op2b); | |
3884 | static tree | |
3885 | and_var_with_comparison (tree var, bool invert, | |
3886 | enum tree_code code2, tree op2a, tree op2b); | |
3887 | static tree | |
3888 | and_var_with_comparison_1 (gimple stmt, | |
3889 | enum tree_code code2, tree op2a, tree op2b); | |
3890 | static tree | |
3891 | or_comparisons_1 (enum tree_code code1, tree op1a, tree op1b, | |
3892 | enum tree_code code2, tree op2a, tree op2b); | |
3893 | static tree | |
3894 | or_var_with_comparison (tree var, bool invert, | |
3895 | enum tree_code code2, tree op2a, tree op2b); | |
3896 | static tree | |
3897 | or_var_with_comparison_1 (gimple stmt, | |
3898 | enum tree_code code2, tree op2a, tree op2b); | |
3899 | ||
3900 | /* Helper function for and_comparisons_1: try to simplify the AND of the | |
3901 | ssa variable VAR with the comparison specified by (OP2A CODE2 OP2B). | |
3902 | If INVERT is true, invert the value of the VAR before doing the AND. | |
3903 | Return NULL_EXPR if we can't simplify this to a single expression. */ | |
3904 | ||
3905 | static tree | |
3906 | and_var_with_comparison (tree var, bool invert, | |
3907 | enum tree_code code2, tree op2a, tree op2b) | |
3908 | { | |
3909 | tree t; | |
3910 | gimple stmt = SSA_NAME_DEF_STMT (var); | |
3911 | ||
3912 | /* We can only deal with variables whose definitions are assignments. */ | |
3913 | if (!is_gimple_assign (stmt)) | |
3914 | return NULL_TREE; | |
3915 | ||
3916 | /* If we have an inverted comparison, apply DeMorgan's law and rewrite | |
3917 | !var AND (op2a code2 op2b) => !(var OR !(op2a code2 op2b)) | |
3918 | Then we only have to consider the simpler non-inverted cases. */ | |
3919 | if (invert) | |
3920 | t = or_var_with_comparison_1 (stmt, | |
3921 | invert_tree_comparison (code2, false), | |
3922 | op2a, op2b); | |
3923 | else | |
3924 | t = and_var_with_comparison_1 (stmt, code2, op2a, op2b); | |
3925 | return canonicalize_bool (t, invert); | |
3926 | } | |
3927 | ||
3928 | /* Try to simplify the AND of the ssa variable defined by the assignment | |
3929 | STMT with the comparison specified by (OP2A CODE2 OP2B). | |
3930 | Return NULL_EXPR if we can't simplify this to a single expression. */ | |
3931 | ||
3932 | static tree | |
3933 | and_var_with_comparison_1 (gimple stmt, | |
3934 | enum tree_code code2, tree op2a, tree op2b) | |
3935 | { | |
3936 | tree var = gimple_assign_lhs (stmt); | |
3937 | tree true_test_var = NULL_TREE; | |
3938 | tree false_test_var = NULL_TREE; | |
3939 | enum tree_code innercode = gimple_assign_rhs_code (stmt); | |
3940 | ||
3941 | /* Check for identities like (var AND (var == 0)) => false. */ | |
3942 | if (TREE_CODE (op2a) == SSA_NAME | |
3943 | && TREE_CODE (TREE_TYPE (var)) == BOOLEAN_TYPE) | |
3944 | { | |
3945 | if ((code2 == NE_EXPR && integer_zerop (op2b)) | |
3946 | || (code2 == EQ_EXPR && integer_nonzerop (op2b))) | |
3947 | { | |
3948 | true_test_var = op2a; | |
3949 | if (var == true_test_var) | |
3950 | return var; | |
3951 | } | |
3952 | else if ((code2 == EQ_EXPR && integer_zerop (op2b)) | |
3953 | || (code2 == NE_EXPR && integer_nonzerop (op2b))) | |
3954 | { | |
3955 | false_test_var = op2a; | |
3956 | if (var == false_test_var) | |
3957 | return boolean_false_node; | |
3958 | } | |
3959 | } | |
3960 | ||
3961 | /* If the definition is a comparison, recurse on it. */ | |
3962 | if (TREE_CODE_CLASS (innercode) == tcc_comparison) | |
3963 | { | |
3964 | tree t = and_comparisons_1 (innercode, | |
3965 | gimple_assign_rhs1 (stmt), | |
3966 | gimple_assign_rhs2 (stmt), | |
3967 | code2, | |
3968 | op2a, | |
3969 | op2b); | |
3970 | if (t) | |
3971 | return t; | |
3972 | } | |
3973 | ||
3974 | /* If the definition is an AND or OR expression, we may be able to | |
3975 | simplify by reassociating. */ | |
eb9820c0 KT |
3976 | if (TREE_CODE (TREE_TYPE (var)) == BOOLEAN_TYPE |
3977 | && (innercode == BIT_AND_EXPR || innercode == BIT_IOR_EXPR)) | |
e89065a1 SL |
3978 | { |
3979 | tree inner1 = gimple_assign_rhs1 (stmt); | |
3980 | tree inner2 = gimple_assign_rhs2 (stmt); | |
3981 | gimple s; | |
3982 | tree t; | |
3983 | tree partial = NULL_TREE; | |
eb9820c0 | 3984 | bool is_and = (innercode == BIT_AND_EXPR); |
e89065a1 SL |
3985 | |
3986 | /* Check for boolean identities that don't require recursive examination | |
3987 | of inner1/inner2: | |
3988 | inner1 AND (inner1 AND inner2) => inner1 AND inner2 => var | |
3989 | inner1 AND (inner1 OR inner2) => inner1 | |
3990 | !inner1 AND (inner1 AND inner2) => false | |
3991 | !inner1 AND (inner1 OR inner2) => !inner1 AND inner2 | |
3992 | Likewise for similar cases involving inner2. */ | |
3993 | if (inner1 == true_test_var) | |
3994 | return (is_and ? var : inner1); | |
3995 | else if (inner2 == true_test_var) | |
3996 | return (is_and ? var : inner2); | |
3997 | else if (inner1 == false_test_var) | |
3998 | return (is_and | |
3999 | ? boolean_false_node | |
4000 | : and_var_with_comparison (inner2, false, code2, op2a, op2b)); | |
4001 | else if (inner2 == false_test_var) | |
4002 | return (is_and | |
4003 | ? boolean_false_node | |
4004 | : and_var_with_comparison (inner1, false, code2, op2a, op2b)); | |
4005 | ||
4006 | /* Next, redistribute/reassociate the AND across the inner tests. | |
4007 | Compute the first partial result, (inner1 AND (op2a code op2b)) */ | |
4008 | if (TREE_CODE (inner1) == SSA_NAME | |
4009 | && is_gimple_assign (s = SSA_NAME_DEF_STMT (inner1)) | |
4010 | && TREE_CODE_CLASS (gimple_assign_rhs_code (s)) == tcc_comparison | |
4011 | && (t = maybe_fold_and_comparisons (gimple_assign_rhs_code (s), | |
4012 | gimple_assign_rhs1 (s), | |
4013 | gimple_assign_rhs2 (s), | |
4014 | code2, op2a, op2b))) | |
4015 | { | |
4016 | /* Handle the AND case, where we are reassociating: | |
4017 | (inner1 AND inner2) AND (op2a code2 op2b) | |
4018 | => (t AND inner2) | |
4019 | If the partial result t is a constant, we win. Otherwise | |
4020 | continue on to try reassociating with the other inner test. */ | |
4021 | if (is_and) | |
4022 | { | |
4023 | if (integer_onep (t)) | |
4024 | return inner2; | |
4025 | else if (integer_zerop (t)) | |
4026 | return boolean_false_node; | |
4027 | } | |
4028 | ||
4029 | /* Handle the OR case, where we are redistributing: | |
4030 | (inner1 OR inner2) AND (op2a code2 op2b) | |
4031 | => (t OR (inner2 AND (op2a code2 op2b))) */ | |
8236c8eb JJ |
4032 | else if (integer_onep (t)) |
4033 | return boolean_true_node; | |
4034 | ||
4035 | /* Save partial result for later. */ | |
4036 | partial = t; | |
e89065a1 SL |
4037 | } |
4038 | ||
4039 | /* Compute the second partial result, (inner2 AND (op2a code op2b)) */ | |
4040 | if (TREE_CODE (inner2) == SSA_NAME | |
4041 | && is_gimple_assign (s = SSA_NAME_DEF_STMT (inner2)) | |
4042 | && TREE_CODE_CLASS (gimple_assign_rhs_code (s)) == tcc_comparison | |
4043 | && (t = maybe_fold_and_comparisons (gimple_assign_rhs_code (s), | |
4044 | gimple_assign_rhs1 (s), | |
4045 | gimple_assign_rhs2 (s), | |
4046 | code2, op2a, op2b))) | |
4047 | { | |
4048 | /* Handle the AND case, where we are reassociating: | |
4049 | (inner1 AND inner2) AND (op2a code2 op2b) | |
4050 | => (inner1 AND t) */ | |
4051 | if (is_and) | |
4052 | { | |
4053 | if (integer_onep (t)) | |
4054 | return inner1; | |
4055 | else if (integer_zerop (t)) | |
4056 | return boolean_false_node; | |
8236c8eb JJ |
4057 | /* If both are the same, we can apply the identity |
4058 | (x AND x) == x. */ | |
4059 | else if (partial && same_bool_result_p (t, partial)) | |
4060 | return t; | |
e89065a1 SL |
4061 | } |
4062 | ||
4063 | /* Handle the OR case. where we are redistributing: | |
4064 | (inner1 OR inner2) AND (op2a code2 op2b) | |
4065 | => (t OR (inner1 AND (op2a code2 op2b))) | |
4066 | => (t OR partial) */ | |
4067 | else | |
4068 | { | |
4069 | if (integer_onep (t)) | |
4070 | return boolean_true_node; | |
4071 | else if (partial) | |
4072 | { | |
4073 | /* We already got a simplification for the other | |
4074 | operand to the redistributed OR expression. The | |
4075 | interesting case is when at least one is false. | |
4076 | Or, if both are the same, we can apply the identity | |
4077 | (x OR x) == x. */ | |
4078 | if (integer_zerop (partial)) | |
4079 | return t; | |
4080 | else if (integer_zerop (t)) | |
4081 | return partial; | |
4082 | else if (same_bool_result_p (t, partial)) | |
4083 | return t; | |
4084 | } | |
4085 | } | |
4086 | } | |
4087 | } | |
4088 | return NULL_TREE; | |
4089 | } | |
4090 | ||
4091 | /* Try to simplify the AND of two comparisons defined by | |
4092 | (OP1A CODE1 OP1B) and (OP2A CODE2 OP2B), respectively. | |
4093 | If this can be done without constructing an intermediate value, | |
4094 | return the resulting tree; otherwise NULL_TREE is returned. | |
4095 | This function is deliberately asymmetric as it recurses on SSA_DEFs | |
4096 | in the first comparison but not the second. */ | |
4097 | ||
4098 | static tree | |
4099 | and_comparisons_1 (enum tree_code code1, tree op1a, tree op1b, | |
4100 | enum tree_code code2, tree op2a, tree op2b) | |
4101 | { | |
ae22ac3c | 4102 | tree truth_type = truth_type_for (TREE_TYPE (op1a)); |
31ed6226 | 4103 | |
e89065a1 SL |
4104 | /* First check for ((x CODE1 y) AND (x CODE2 y)). */ |
4105 | if (operand_equal_p (op1a, op2a, 0) | |
4106 | && operand_equal_p (op1b, op2b, 0)) | |
4107 | { | |
eb9820c0 | 4108 | /* Result will be either NULL_TREE, or a combined comparison. */ |
e89065a1 SL |
4109 | tree t = combine_comparisons (UNKNOWN_LOCATION, |
4110 | TRUTH_ANDIF_EXPR, code1, code2, | |
31ed6226 | 4111 | truth_type, op1a, op1b); |
e89065a1 SL |
4112 | if (t) |
4113 | return t; | |
4114 | } | |
4115 | ||
4116 | /* Likewise the swapped case of the above. */ | |
4117 | if (operand_equal_p (op1a, op2b, 0) | |
4118 | && operand_equal_p (op1b, op2a, 0)) | |
4119 | { | |
eb9820c0 | 4120 | /* Result will be either NULL_TREE, or a combined comparison. */ |
e89065a1 SL |
4121 | tree t = combine_comparisons (UNKNOWN_LOCATION, |
4122 | TRUTH_ANDIF_EXPR, code1, | |
4123 | swap_tree_comparison (code2), | |
31ed6226 | 4124 | truth_type, op1a, op1b); |
e89065a1 SL |
4125 | if (t) |
4126 | return t; | |
4127 | } | |
4128 | ||
4129 | /* If both comparisons are of the same value against constants, we might | |
4130 | be able to merge them. */ | |
4131 | if (operand_equal_p (op1a, op2a, 0) | |
4132 | && TREE_CODE (op1b) == INTEGER_CST | |
4133 | && TREE_CODE (op2b) == INTEGER_CST) | |
4134 | { | |
4135 | int cmp = tree_int_cst_compare (op1b, op2b); | |
4136 | ||
4137 | /* If we have (op1a == op1b), we should either be able to | |
4138 | return that or FALSE, depending on whether the constant op1b | |
4139 | also satisfies the other comparison against op2b. */ | |
4140 | if (code1 == EQ_EXPR) | |
4141 | { | |
4142 | bool done = true; | |
4143 | bool val; | |
4144 | switch (code2) | |
4145 | { | |
4146 | case EQ_EXPR: val = (cmp == 0); break; | |
4147 | case NE_EXPR: val = (cmp != 0); break; | |
4148 | case LT_EXPR: val = (cmp < 0); break; | |
4149 | case GT_EXPR: val = (cmp > 0); break; | |
4150 | case LE_EXPR: val = (cmp <= 0); break; | |
4151 | case GE_EXPR: val = (cmp >= 0); break; | |
4152 | default: done = false; | |
4153 | } | |
4154 | if (done) | |
4155 | { | |
4156 | if (val) | |
4157 | return fold_build2 (code1, boolean_type_node, op1a, op1b); | |
4158 | else | |
4159 | return boolean_false_node; | |
4160 | } | |
4161 | } | |
4162 | /* Likewise if the second comparison is an == comparison. */ | |
4163 | else if (code2 == EQ_EXPR) | |
4164 | { | |
4165 | bool done = true; | |
4166 | bool val; | |
4167 | switch (code1) | |
4168 | { | |
4169 | case EQ_EXPR: val = (cmp == 0); break; | |
4170 | case NE_EXPR: val = (cmp != 0); break; | |
4171 | case LT_EXPR: val = (cmp > 0); break; | |
4172 | case GT_EXPR: val = (cmp < 0); break; | |
4173 | case LE_EXPR: val = (cmp >= 0); break; | |
4174 | case GE_EXPR: val = (cmp <= 0); break; | |
4175 | default: done = false; | |
4176 | } | |
4177 | if (done) | |
4178 | { | |
4179 | if (val) | |
4180 | return fold_build2 (code2, boolean_type_node, op2a, op2b); | |
4181 | else | |
4182 | return boolean_false_node; | |
4183 | } | |
4184 | } | |
4185 | ||
4186 | /* Same business with inequality tests. */ | |
4187 | else if (code1 == NE_EXPR) | |
4188 | { | |
4189 | bool val; | |
4190 | switch (code2) | |
4191 | { | |
4192 | case EQ_EXPR: val = (cmp != 0); break; | |
4193 | case NE_EXPR: val = (cmp == 0); break; | |
4194 | case LT_EXPR: val = (cmp >= 0); break; | |
4195 | case GT_EXPR: val = (cmp <= 0); break; | |
4196 | case LE_EXPR: val = (cmp > 0); break; | |
4197 | case GE_EXPR: val = (cmp < 0); break; | |
4198 | default: | |
4199 | val = false; | |
4200 | } | |
4201 | if (val) | |
4202 | return fold_build2 (code2, boolean_type_node, op2a, op2b); | |
4203 | } | |
4204 | else if (code2 == NE_EXPR) | |
4205 | { | |
4206 | bool val; | |
4207 | switch (code1) | |
4208 | { | |
4209 | case EQ_EXPR: val = (cmp == 0); break; | |
4210 | case NE_EXPR: val = (cmp != 0); break; | |
4211 | case LT_EXPR: val = (cmp <= 0); break; | |
4212 | case GT_EXPR: val = (cmp >= 0); break; | |
4213 | case LE_EXPR: val = (cmp < 0); break; | |
4214 | case GE_EXPR: val = (cmp > 0); break; | |
4215 | default: | |
4216 | val = false; | |
4217 | } | |
4218 | if (val) | |
4219 | return fold_build2 (code1, boolean_type_node, op1a, op1b); | |
4220 | } | |
4221 | ||
4222 | /* Chose the more restrictive of two < or <= comparisons. */ | |
4223 | else if ((code1 == LT_EXPR || code1 == LE_EXPR) | |
4224 | && (code2 == LT_EXPR || code2 == LE_EXPR)) | |
4225 | { | |
4226 | if ((cmp < 0) || (cmp == 0 && code1 == LT_EXPR)) | |
4227 | return fold_build2 (code1, boolean_type_node, op1a, op1b); | |
4228 | else | |
4229 | return fold_build2 (code2, boolean_type_node, op2a, op2b); | |
4230 | } | |
4231 | ||
4232 | /* Likewise chose the more restrictive of two > or >= comparisons. */ | |
4233 | else if ((code1 == GT_EXPR || code1 == GE_EXPR) | |
4234 | && (code2 == GT_EXPR || code2 == GE_EXPR)) | |
4235 | { | |
4236 | if ((cmp > 0) || (cmp == 0 && code1 == GT_EXPR)) | |
4237 | return fold_build2 (code1, boolean_type_node, op1a, op1b); | |
4238 | else | |
4239 | return fold_build2 (code2, boolean_type_node, op2a, op2b); | |
4240 | } | |
4241 | ||
4242 | /* Check for singleton ranges. */ | |
4243 | else if (cmp == 0 | |
4244 | && ((code1 == LE_EXPR && code2 == GE_EXPR) | |
4245 | || (code1 == GE_EXPR && code2 == LE_EXPR))) | |
4246 | return fold_build2 (EQ_EXPR, boolean_type_node, op1a, op2b); | |
4247 | ||
4248 | /* Check for disjoint ranges. */ | |
4249 | else if (cmp <= 0 | |
4250 | && (code1 == LT_EXPR || code1 == LE_EXPR) | |
4251 | && (code2 == GT_EXPR || code2 == GE_EXPR)) | |
4252 | return boolean_false_node; | |
4253 | else if (cmp >= 0 | |
4254 | && (code1 == GT_EXPR || code1 == GE_EXPR) | |
4255 | && (code2 == LT_EXPR || code2 == LE_EXPR)) | |
4256 | return boolean_false_node; | |
4257 | } | |
4258 | ||
4259 | /* Perhaps the first comparison is (NAME != 0) or (NAME == 1) where | |
4260 | NAME's definition is a truth value. See if there are any simplifications | |
4261 | that can be done against the NAME's definition. */ | |
4262 | if (TREE_CODE (op1a) == SSA_NAME | |
4263 | && (code1 == NE_EXPR || code1 == EQ_EXPR) | |
4264 | && (integer_zerop (op1b) || integer_onep (op1b))) | |
4265 | { | |
4266 | bool invert = ((code1 == EQ_EXPR && integer_zerop (op1b)) | |
4267 | || (code1 == NE_EXPR && integer_onep (op1b))); | |
4268 | gimple stmt = SSA_NAME_DEF_STMT (op1a); | |
4269 | switch (gimple_code (stmt)) | |
4270 | { | |
4271 | case GIMPLE_ASSIGN: | |
4272 | /* Try to simplify by copy-propagating the definition. */ | |
4273 | return and_var_with_comparison (op1a, invert, code2, op2a, op2b); | |
4274 | ||
4275 | case GIMPLE_PHI: | |
4276 | /* If every argument to the PHI produces the same result when | |
4277 | ANDed with the second comparison, we win. | |
4278 | Do not do this unless the type is bool since we need a bool | |
4279 | result here anyway. */ | |
4280 | if (TREE_CODE (TREE_TYPE (op1a)) == BOOLEAN_TYPE) | |
4281 | { | |
4282 | tree result = NULL_TREE; | |
4283 | unsigned i; | |
4284 | for (i = 0; i < gimple_phi_num_args (stmt); i++) | |
4285 | { | |
4286 | tree arg = gimple_phi_arg_def (stmt, i); | |
4287 | ||
4288 | /* If this PHI has itself as an argument, ignore it. | |
4289 | If all the other args produce the same result, | |
4290 | we're still OK. */ | |
4291 | if (arg == gimple_phi_result (stmt)) | |
4292 | continue; | |
4293 | else if (TREE_CODE (arg) == INTEGER_CST) | |
4294 | { | |
4295 | if (invert ? integer_nonzerop (arg) : integer_zerop (arg)) | |
4296 | { | |
4297 | if (!result) | |
4298 | result = boolean_false_node; | |
4299 | else if (!integer_zerop (result)) | |
4300 | return NULL_TREE; | |
4301 | } | |
4302 | else if (!result) | |
4303 | result = fold_build2 (code2, boolean_type_node, | |
4304 | op2a, op2b); | |
4305 | else if (!same_bool_comparison_p (result, | |
4306 | code2, op2a, op2b)) | |
4307 | return NULL_TREE; | |
4308 | } | |
0e8b84ec JJ |
4309 | else if (TREE_CODE (arg) == SSA_NAME |
4310 | && !SSA_NAME_IS_DEFAULT_DEF (arg)) | |
e89065a1 | 4311 | { |
6c66f733 JJ |
4312 | tree temp; |
4313 | gimple def_stmt = SSA_NAME_DEF_STMT (arg); | |
4314 | /* In simple cases we can look through PHI nodes, | |
4315 | but we have to be careful with loops. | |
4316 | See PR49073. */ | |
4317 | if (! dom_info_available_p (CDI_DOMINATORS) | |
4318 | || gimple_bb (def_stmt) == gimple_bb (stmt) | |
4319 | || dominated_by_p (CDI_DOMINATORS, | |
4320 | gimple_bb (def_stmt), | |
4321 | gimple_bb (stmt))) | |
4322 | return NULL_TREE; | |
4323 | temp = and_var_with_comparison (arg, invert, code2, | |
4324 | op2a, op2b); | |
e89065a1 SL |
4325 | if (!temp) |
4326 | return NULL_TREE; | |
4327 | else if (!result) | |
4328 | result = temp; | |
4329 | else if (!same_bool_result_p (result, temp)) | |
4330 | return NULL_TREE; | |
4331 | } | |
4332 | else | |
4333 | return NULL_TREE; | |
4334 | } | |
4335 | return result; | |
4336 | } | |
4337 | ||
4338 | default: | |
4339 | break; | |
4340 | } | |
4341 | } | |
4342 | return NULL_TREE; | |
4343 | } | |
4344 | ||
4345 | /* Try to simplify the AND of two comparisons, specified by | |
4346 | (OP1A CODE1 OP1B) and (OP2B CODE2 OP2B), respectively. | |
4347 | If this can be simplified to a single expression (without requiring | |
4348 | introducing more SSA variables to hold intermediate values), | |
4349 | return the resulting tree. Otherwise return NULL_TREE. | |
4350 | If the result expression is non-null, it has boolean type. */ | |
4351 | ||
4352 | tree | |
4353 | maybe_fold_and_comparisons (enum tree_code code1, tree op1a, tree op1b, | |
4354 | enum tree_code code2, tree op2a, tree op2b) | |
4355 | { | |
4356 | tree t = and_comparisons_1 (code1, op1a, op1b, code2, op2a, op2b); | |
4357 | if (t) | |
4358 | return t; | |
4359 | else | |
4360 | return and_comparisons_1 (code2, op2a, op2b, code1, op1a, op1b); | |
4361 | } | |
4362 | ||
4363 | /* Helper function for or_comparisons_1: try to simplify the OR of the | |
4364 | ssa variable VAR with the comparison specified by (OP2A CODE2 OP2B). | |
4365 | If INVERT is true, invert the value of VAR before doing the OR. | |
4366 | Return NULL_EXPR if we can't simplify this to a single expression. */ | |
4367 | ||
4368 | static tree | |
4369 | or_var_with_comparison (tree var, bool invert, | |
4370 | enum tree_code code2, tree op2a, tree op2b) | |
4371 | { | |
4372 | tree t; | |
4373 | gimple stmt = SSA_NAME_DEF_STMT (var); | |
4374 | ||
4375 | /* We can only deal with variables whose definitions are assignments. */ | |
4376 | if (!is_gimple_assign (stmt)) | |
4377 | return NULL_TREE; | |
4378 | ||
4379 | /* If we have an inverted comparison, apply DeMorgan's law and rewrite | |
4380 | !var OR (op2a code2 op2b) => !(var AND !(op2a code2 op2b)) | |
4381 | Then we only have to consider the simpler non-inverted cases. */ | |
4382 | if (invert) | |
4383 | t = and_var_with_comparison_1 (stmt, | |
4384 | invert_tree_comparison (code2, false), | |
4385 | op2a, op2b); | |
4386 | else | |
4387 | t = or_var_with_comparison_1 (stmt, code2, op2a, op2b); | |
4388 | return canonicalize_bool (t, invert); | |
4389 | } | |
4390 | ||
4391 | /* Try to simplify the OR of the ssa variable defined by the assignment | |
4392 | STMT with the comparison specified by (OP2A CODE2 OP2B). | |
4393 | Return NULL_EXPR if we can't simplify this to a single expression. */ | |
4394 | ||
4395 | static tree | |
4396 | or_var_with_comparison_1 (gimple stmt, | |
4397 | enum tree_code code2, tree op2a, tree op2b) | |
4398 | { | |
4399 | tree var = gimple_assign_lhs (stmt); | |
4400 | tree true_test_var = NULL_TREE; | |
4401 | tree false_test_var = NULL_TREE; | |
4402 | enum tree_code innercode = gimple_assign_rhs_code (stmt); | |
4403 | ||
4404 | /* Check for identities like (var OR (var != 0)) => true . */ | |
4405 | if (TREE_CODE (op2a) == SSA_NAME | |
4406 | && TREE_CODE (TREE_TYPE (var)) == BOOLEAN_TYPE) | |
4407 | { | |
4408 | if ((code2 == NE_EXPR && integer_zerop (op2b)) | |
4409 | || (code2 == EQ_EXPR && integer_nonzerop (op2b))) | |
4410 | { | |
4411 | true_test_var = op2a; | |
4412 | if (var == true_test_var) | |
4413 | return var; | |
4414 | } | |
4415 | else if ((code2 == EQ_EXPR && integer_zerop (op2b)) | |
4416 | || (code2 == NE_EXPR && integer_nonzerop (op2b))) | |
4417 | { | |
4418 | false_test_var = op2a; | |
4419 | if (var == false_test_var) | |
4420 | return boolean_true_node; | |
4421 | } | |
4422 | } | |
4423 | ||
4424 | /* If the definition is a comparison, recurse on it. */ | |
4425 | if (TREE_CODE_CLASS (innercode) == tcc_comparison) | |
4426 | { | |
4427 | tree t = or_comparisons_1 (innercode, | |
4428 | gimple_assign_rhs1 (stmt), | |
4429 | gimple_assign_rhs2 (stmt), | |
4430 | code2, | |
4431 | op2a, | |
4432 | op2b); | |
4433 | if (t) | |
4434 | return t; | |
4435 | } | |
4436 | ||
4437 | /* If the definition is an AND or OR expression, we may be able to | |
4438 | simplify by reassociating. */ | |
eb9820c0 KT |
4439 | if (TREE_CODE (TREE_TYPE (var)) == BOOLEAN_TYPE |
4440 | && (innercode == BIT_AND_EXPR || innercode == BIT_IOR_EXPR)) | |
e89065a1 SL |
4441 | { |
4442 | tree inner1 = gimple_assign_rhs1 (stmt); | |
4443 | tree inner2 = gimple_assign_rhs2 (stmt); | |
4444 | gimple s; | |
4445 | tree t; | |
4446 | tree partial = NULL_TREE; | |
eb9820c0 | 4447 | bool is_or = (innercode == BIT_IOR_EXPR); |
e89065a1 SL |
4448 | |
4449 | /* Check for boolean identities that don't require recursive examination | |
4450 | of inner1/inner2: | |
4451 | inner1 OR (inner1 OR inner2) => inner1 OR inner2 => var | |
4452 | inner1 OR (inner1 AND inner2) => inner1 | |
4453 | !inner1 OR (inner1 OR inner2) => true | |
4454 | !inner1 OR (inner1 AND inner2) => !inner1 OR inner2 | |
4455 | */ | |
4456 | if (inner1 == true_test_var) | |
4457 | return (is_or ? var : inner1); | |
4458 | else if (inner2 == true_test_var) | |
4459 | return (is_or ? var : inner2); | |
4460 | else if (inner1 == false_test_var) | |
4461 | return (is_or | |
4462 | ? boolean_true_node | |
4463 | : or_var_with_comparison (inner2, false, code2, op2a, op2b)); | |
4464 | else if (inner2 == false_test_var) | |
4465 | return (is_or | |
4466 | ? boolean_true_node | |
4467 | : or_var_with_comparison (inner1, false, code2, op2a, op2b)); | |
4468 | ||
4469 | /* Next, redistribute/reassociate the OR across the inner tests. | |
4470 | Compute the first partial result, (inner1 OR (op2a code op2b)) */ | |
4471 | if (TREE_CODE (inner1) == SSA_NAME | |
4472 | && is_gimple_assign (s = SSA_NAME_DEF_STMT (inner1)) | |
4473 | && TREE_CODE_CLASS (gimple_assign_rhs_code (s)) == tcc_comparison | |
4474 | && (t = maybe_fold_or_comparisons (gimple_assign_rhs_code (s), | |
4475 | gimple_assign_rhs1 (s), | |
4476 | gimple_assign_rhs2 (s), | |
4477 | code2, op2a, op2b))) | |
4478 | { | |
4479 | /* Handle the OR case, where we are reassociating: | |
4480 | (inner1 OR inner2) OR (op2a code2 op2b) | |
4481 | => (t OR inner2) | |
4482 | If the partial result t is a constant, we win. Otherwise | |
4483 | continue on to try reassociating with the other inner test. */ | |
8236c8eb | 4484 | if (is_or) |
e89065a1 SL |
4485 | { |
4486 | if (integer_onep (t)) | |
4487 | return boolean_true_node; | |
4488 | else if (integer_zerop (t)) | |
4489 | return inner2; | |
4490 | } | |
4491 | ||
4492 | /* Handle the AND case, where we are redistributing: | |
4493 | (inner1 AND inner2) OR (op2a code2 op2b) | |
4494 | => (t AND (inner2 OR (op2a code op2b))) */ | |
8236c8eb JJ |
4495 | else if (integer_zerop (t)) |
4496 | return boolean_false_node; | |
4497 | ||
4498 | /* Save partial result for later. */ | |
4499 | partial = t; | |
e89065a1 SL |
4500 | } |
4501 | ||
4502 | /* Compute the second partial result, (inner2 OR (op2a code op2b)) */ | |
4503 | if (TREE_CODE (inner2) == SSA_NAME | |
4504 | && is_gimple_assign (s = SSA_NAME_DEF_STMT (inner2)) | |
4505 | && TREE_CODE_CLASS (gimple_assign_rhs_code (s)) == tcc_comparison | |
4506 | && (t = maybe_fold_or_comparisons (gimple_assign_rhs_code (s), | |
4507 | gimple_assign_rhs1 (s), | |
4508 | gimple_assign_rhs2 (s), | |
4509 | code2, op2a, op2b))) | |
4510 | { | |
4511 | /* Handle the OR case, where we are reassociating: | |
4512 | (inner1 OR inner2) OR (op2a code2 op2b) | |
8236c8eb JJ |
4513 | => (inner1 OR t) |
4514 | => (t OR partial) */ | |
4515 | if (is_or) | |
e89065a1 SL |
4516 | { |
4517 | if (integer_zerop (t)) | |
4518 | return inner1; | |
4519 | else if (integer_onep (t)) | |
4520 | return boolean_true_node; | |
8236c8eb JJ |
4521 | /* If both are the same, we can apply the identity |
4522 | (x OR x) == x. */ | |
4523 | else if (partial && same_bool_result_p (t, partial)) | |
4524 | return t; | |
e89065a1 SL |
4525 | } |
4526 | ||
4527 | /* Handle the AND case, where we are redistributing: | |
4528 | (inner1 AND inner2) OR (op2a code2 op2b) | |
4529 | => (t AND (inner1 OR (op2a code2 op2b))) | |
4530 | => (t AND partial) */ | |
4531 | else | |
4532 | { | |
4533 | if (integer_zerop (t)) | |
4534 | return boolean_false_node; | |
4535 | else if (partial) | |
4536 | { | |
4537 | /* We already got a simplification for the other | |
4538 | operand to the redistributed AND expression. The | |
4539 | interesting case is when at least one is true. | |
4540 | Or, if both are the same, we can apply the identity | |
8236c8eb | 4541 | (x AND x) == x. */ |
e89065a1 SL |
4542 | if (integer_onep (partial)) |
4543 | return t; | |
4544 | else if (integer_onep (t)) | |
4545 | return partial; | |
4546 | else if (same_bool_result_p (t, partial)) | |
8236c8eb | 4547 | return t; |
e89065a1 SL |
4548 | } |
4549 | } | |
4550 | } | |
4551 | } | |
4552 | return NULL_TREE; | |
4553 | } | |
4554 | ||
4555 | /* Try to simplify the OR of two comparisons defined by | |
4556 | (OP1A CODE1 OP1B) and (OP2A CODE2 OP2B), respectively. | |
4557 | If this can be done without constructing an intermediate value, | |
4558 | return the resulting tree; otherwise NULL_TREE is returned. | |
4559 | This function is deliberately asymmetric as it recurses on SSA_DEFs | |
4560 | in the first comparison but not the second. */ | |
4561 | ||
4562 | static tree | |
4563 | or_comparisons_1 (enum tree_code code1, tree op1a, tree op1b, | |
4564 | enum tree_code code2, tree op2a, tree op2b) | |
4565 | { | |
ae22ac3c | 4566 | tree truth_type = truth_type_for (TREE_TYPE (op1a)); |
31ed6226 | 4567 | |
e89065a1 SL |
4568 | /* First check for ((x CODE1 y) OR (x CODE2 y)). */ |
4569 | if (operand_equal_p (op1a, op2a, 0) | |
4570 | && operand_equal_p (op1b, op2b, 0)) | |
4571 | { | |
eb9820c0 | 4572 | /* Result will be either NULL_TREE, or a combined comparison. */ |
e89065a1 SL |
4573 | tree t = combine_comparisons (UNKNOWN_LOCATION, |
4574 | TRUTH_ORIF_EXPR, code1, code2, | |
31ed6226 | 4575 | truth_type, op1a, op1b); |
e89065a1 SL |
4576 | if (t) |
4577 | return t; | |
4578 | } | |
4579 | ||
4580 | /* Likewise the swapped case of the above. */ | |
4581 | if (operand_equal_p (op1a, op2b, 0) | |
4582 | && operand_equal_p (op1b, op2a, 0)) | |
4583 | { | |
eb9820c0 | 4584 | /* Result will be either NULL_TREE, or a combined comparison. */ |
e89065a1 SL |
4585 | tree t = combine_comparisons (UNKNOWN_LOCATION, |
4586 | TRUTH_ORIF_EXPR, code1, | |
4587 | swap_tree_comparison (code2), | |
31ed6226 | 4588 | truth_type, op1a, op1b); |
e89065a1 SL |
4589 | if (t) |
4590 | return t; | |
4591 | } | |
4592 | ||
4593 | /* If both comparisons are of the same value against constants, we might | |
4594 | be able to merge them. */ | |
4595 | if (operand_equal_p (op1a, op2a, 0) | |
4596 | && TREE_CODE (op1b) == INTEGER_CST | |
4597 | && TREE_CODE (op2b) == INTEGER_CST) | |
4598 | { | |
4599 | int cmp = tree_int_cst_compare (op1b, op2b); | |
4600 | ||
4601 | /* If we have (op1a != op1b), we should either be able to | |
4602 | return that or TRUE, depending on whether the constant op1b | |
4603 | also satisfies the other comparison against op2b. */ | |
4604 | if (code1 == NE_EXPR) | |
4605 | { | |
4606 | bool done = true; | |
4607 | bool val; | |
4608 | switch (code2) | |
4609 | { | |
4610 | case EQ_EXPR: val = (cmp == 0); break; | |
4611 | case NE_EXPR: val = (cmp != 0); break; | |
4612 | case LT_EXPR: val = (cmp < 0); break; | |
4613 | case GT_EXPR: val = (cmp > 0); break; | |
4614 | case LE_EXPR: val = (cmp <= 0); break; | |
4615 | case GE_EXPR: val = (cmp >= 0); break; | |
4616 | default: done = false; | |
4617 | } | |
4618 | if (done) | |
4619 | { | |
4620 | if (val) | |
4621 | return boolean_true_node; | |
4622 | else | |
4623 | return fold_build2 (code1, boolean_type_node, op1a, op1b); | |
4624 | } | |
4625 | } | |
4626 | /* Likewise if the second comparison is a != comparison. */ | |
4627 | else if (code2 == NE_EXPR) | |
4628 | { | |
4629 | bool done = true; | |
4630 | bool val; | |
4631 | switch (code1) | |
4632 | { | |
4633 | case EQ_EXPR: val = (cmp == 0); break; | |
4634 | case NE_EXPR: val = (cmp != 0); break; | |
4635 | case LT_EXPR: val = (cmp > 0); break; | |
4636 | case GT_EXPR: val = (cmp < 0); break; | |
4637 | case LE_EXPR: val = (cmp >= 0); break; | |
4638 | case GE_EXPR: val = (cmp <= 0); break; | |
4639 | default: done = false; | |
4640 | } | |
4641 | if (done) | |
4642 | { | |
4643 | if (val) | |
4644 | return boolean_true_node; | |
4645 | else | |
4646 | return fold_build2 (code2, boolean_type_node, op2a, op2b); | |
4647 | } | |
4648 | } | |
4649 | ||
4650 | /* See if an equality test is redundant with the other comparison. */ | |
4651 | else if (code1 == EQ_EXPR) | |
4652 | { | |
4653 | bool val; | |
4654 | switch (code2) | |
4655 | { | |
4656 | case EQ_EXPR: val = (cmp == 0); break; | |
4657 | case NE_EXPR: val = (cmp != 0); break; | |
4658 | case LT_EXPR: val = (cmp < 0); break; | |
4659 | case GT_EXPR: val = (cmp > 0); break; | |
4660 | case LE_EXPR: val = (cmp <= 0); break; | |
4661 | case GE_EXPR: val = (cmp >= 0); break; | |
4662 | default: | |
4663 | val = false; | |
4664 | } | |
4665 | if (val) | |
4666 | return fold_build2 (code2, boolean_type_node, op2a, op2b); | |
4667 | } | |
4668 | else if (code2 == EQ_EXPR) | |
4669 | { | |
4670 | bool val; | |
4671 | switch (code1) | |
4672 | { | |
4673 | case EQ_EXPR: val = (cmp == 0); break; | |
4674 | case NE_EXPR: val = (cmp != 0); break; | |
4675 | case LT_EXPR: val = (cmp > 0); break; | |
4676 | case GT_EXPR: val = (cmp < 0); break; | |
4677 | case LE_EXPR: val = (cmp >= 0); break; | |
4678 | case GE_EXPR: val = (cmp <= 0); break; | |
4679 | default: | |
4680 | val = false; | |
4681 | } | |
4682 | if (val) | |
4683 | return fold_build2 (code1, boolean_type_node, op1a, op1b); | |
4684 | } | |
4685 | ||
4686 | /* Chose the less restrictive of two < or <= comparisons. */ | |
4687 | else if ((code1 == LT_EXPR || code1 == LE_EXPR) | |
4688 | && (code2 == LT_EXPR || code2 == LE_EXPR)) | |
4689 | { | |
4690 | if ((cmp < 0) || (cmp == 0 && code1 == LT_EXPR)) | |
4691 | return fold_build2 (code2, boolean_type_node, op2a, op2b); | |
4692 | else | |
4693 | return fold_build2 (code1, boolean_type_node, op1a, op1b); | |
4694 | } | |
4695 | ||
4696 | /* Likewise chose the less restrictive of two > or >= comparisons. */ | |
4697 | else if ((code1 == GT_EXPR || code1 == GE_EXPR) | |
4698 | && (code2 == GT_EXPR || code2 == GE_EXPR)) | |
4699 | { | |
4700 | if ((cmp > 0) || (cmp == 0 && code1 == GT_EXPR)) | |
4701 | return fold_build2 (code2, boolean_type_node, op2a, op2b); | |
4702 | else | |
4703 | return fold_build2 (code1, boolean_type_node, op1a, op1b); | |
4704 | } | |
4705 | ||
4706 | /* Check for singleton ranges. */ | |
4707 | else if (cmp == 0 | |
4708 | && ((code1 == LT_EXPR && code2 == GT_EXPR) | |
4709 | || (code1 == GT_EXPR && code2 == LT_EXPR))) | |
4710 | return fold_build2 (NE_EXPR, boolean_type_node, op1a, op2b); | |
4711 | ||
4712 | /* Check for less/greater pairs that don't restrict the range at all. */ | |
4713 | else if (cmp >= 0 | |
4714 | && (code1 == LT_EXPR || code1 == LE_EXPR) | |
4715 | && (code2 == GT_EXPR || code2 == GE_EXPR)) | |
4716 | return boolean_true_node; | |
4717 | else if (cmp <= 0 | |
4718 | && (code1 == GT_EXPR || code1 == GE_EXPR) | |
4719 | && (code2 == LT_EXPR || code2 == LE_EXPR)) | |
4720 | return boolean_true_node; | |
4721 | } | |
4722 | ||
4723 | /* Perhaps the first comparison is (NAME != 0) or (NAME == 1) where | |
4724 | NAME's definition is a truth value. See if there are any simplifications | |
4725 | that can be done against the NAME's definition. */ | |
4726 | if (TREE_CODE (op1a) == SSA_NAME | |
4727 | && (code1 == NE_EXPR || code1 == EQ_EXPR) | |
4728 | && (integer_zerop (op1b) || integer_onep (op1b))) | |
4729 | { | |
4730 | bool invert = ((code1 == EQ_EXPR && integer_zerop (op1b)) | |
4731 | || (code1 == NE_EXPR && integer_onep (op1b))); | |
4732 | gimple stmt = SSA_NAME_DEF_STMT (op1a); | |
4733 | switch (gimple_code (stmt)) | |
4734 | { | |
4735 | case GIMPLE_ASSIGN: | |
4736 | /* Try to simplify by copy-propagating the definition. */ | |
4737 | return or_var_with_comparison (op1a, invert, code2, op2a, op2b); | |
4738 | ||
4739 | case GIMPLE_PHI: | |
4740 | /* If every argument to the PHI produces the same result when | |
4741 | ORed with the second comparison, we win. | |
4742 | Do not do this unless the type is bool since we need a bool | |
4743 | result here anyway. */ | |
4744 | if (TREE_CODE (TREE_TYPE (op1a)) == BOOLEAN_TYPE) | |
4745 | { | |
4746 | tree result = NULL_TREE; | |
4747 | unsigned i; | |
4748 | for (i = 0; i < gimple_phi_num_args (stmt); i++) | |
4749 | { | |
4750 | tree arg = gimple_phi_arg_def (stmt, i); | |
4751 | ||
4752 | /* If this PHI has itself as an argument, ignore it. | |
4753 | If all the other args produce the same result, | |
4754 | we're still OK. */ | |
4755 | if (arg == gimple_phi_result (stmt)) | |
4756 | continue; | |
4757 | else if (TREE_CODE (arg) == INTEGER_CST) | |
4758 | { | |
4759 | if (invert ? integer_zerop (arg) : integer_nonzerop (arg)) | |
4760 | { | |
4761 | if (!result) | |
4762 | result = boolean_true_node; | |
4763 | else if (!integer_onep (result)) | |
4764 | return NULL_TREE; | |
4765 | } | |
4766 | else if (!result) | |
4767 | result = fold_build2 (code2, boolean_type_node, | |
4768 | op2a, op2b); | |
4769 | else if (!same_bool_comparison_p (result, | |
4770 | code2, op2a, op2b)) | |
4771 | return NULL_TREE; | |
4772 | } | |
0e8b84ec JJ |
4773 | else if (TREE_CODE (arg) == SSA_NAME |
4774 | && !SSA_NAME_IS_DEFAULT_DEF (arg)) | |
e89065a1 | 4775 | { |
6c66f733 JJ |
4776 | tree temp; |
4777 | gimple def_stmt = SSA_NAME_DEF_STMT (arg); | |
4778 | /* In simple cases we can look through PHI nodes, | |
4779 | but we have to be careful with loops. | |
4780 | See PR49073. */ | |
4781 | if (! dom_info_available_p (CDI_DOMINATORS) | |
4782 | || gimple_bb (def_stmt) == gimple_bb (stmt) | |
4783 | || dominated_by_p (CDI_DOMINATORS, | |
4784 | gimple_bb (def_stmt), | |
4785 | gimple_bb (stmt))) | |
4786 | return NULL_TREE; | |
4787 | temp = or_var_with_comparison (arg, invert, code2, | |
4788 | op2a, op2b); | |
e89065a1 SL |
4789 | if (!temp) |
4790 | return NULL_TREE; | |
4791 | else if (!result) | |
4792 | result = temp; | |
4793 | else if (!same_bool_result_p (result, temp)) | |
4794 | return NULL_TREE; | |
4795 | } | |
4796 | else | |
4797 | return NULL_TREE; | |
4798 | } | |
4799 | return result; | |
4800 | } | |
4801 | ||
4802 | default: | |
4803 | break; | |
4804 | } | |
4805 | } | |
4806 | return NULL_TREE; | |
4807 | } | |
4808 | ||
4809 | /* Try to simplify the OR of two comparisons, specified by | |
4810 | (OP1A CODE1 OP1B) and (OP2B CODE2 OP2B), respectively. | |
4811 | If this can be simplified to a single expression (without requiring | |
4812 | introducing more SSA variables to hold intermediate values), | |
4813 | return the resulting tree. Otherwise return NULL_TREE. | |
4814 | If the result expression is non-null, it has boolean type. */ | |
4815 | ||
4816 | tree | |
4817 | maybe_fold_or_comparisons (enum tree_code code1, tree op1a, tree op1b, | |
4818 | enum tree_code code2, tree op2a, tree op2b) | |
4819 | { | |
4820 | tree t = or_comparisons_1 (code1, op1a, op1b, code2, op2a, op2b); | |
4821 | if (t) | |
4822 | return t; | |
4823 | else | |
4824 | return or_comparisons_1 (code2, op2a, op2b, code1, op1a, op1b); | |
4825 | } | |
cfef45c8 RG |
4826 | |
4827 | ||
4828 | /* Fold STMT to a constant using VALUEIZE to valueize SSA names. | |
4829 | ||
4830 | Either NULL_TREE, a simplified but non-constant or a constant | |
4831 | is returned. | |
4832 | ||
4833 | ??? This should go into a gimple-fold-inline.h file to be eventually | |
4834 | privatized with the single valueize function used in the various TUs | |
4835 | to avoid the indirect function call overhead. */ | |
4836 | ||
4837 | tree | |
d2a85801 RB |
4838 | gimple_fold_stmt_to_constant_1 (gimple stmt, tree (*valueize) (tree), |
4839 | tree (*gvalueize) (tree)) | |
cfef45c8 | 4840 | { |
45cc9f96 RB |
4841 | code_helper rcode; |
4842 | tree ops[3] = {}; | |
4843 | /* ??? The SSA propagators do not correctly deal with following SSA use-def | |
4844 | edges if there are intermediate VARYING defs. For this reason | |
4845 | do not follow SSA edges here even though SCCVN can technically | |
4846 | just deal fine with that. */ | |
d2a85801 | 4847 | if (gimple_simplify (stmt, &rcode, ops, NULL, gvalueize) |
45cc9f96 RB |
4848 | && rcode.is_tree_code () |
4849 | && (TREE_CODE_LENGTH ((tree_code) rcode) == 0 | |
4850 | || ((tree_code) rcode) == ADDR_EXPR) | |
4851 | && is_gimple_val (ops[0])) | |
4852 | { | |
4853 | tree res = ops[0]; | |
4854 | if (dump_file && dump_flags & TDF_DETAILS) | |
4855 | { | |
4856 | fprintf (dump_file, "Match-and-simplified "); | |
4857 | print_gimple_expr (dump_file, stmt, 0, TDF_SLIM); | |
4858 | fprintf (dump_file, " to "); | |
4859 | print_generic_expr (dump_file, res, 0); | |
4860 | fprintf (dump_file, "\n"); | |
4861 | } | |
4862 | return res; | |
4863 | } | |
4864 | ||
cfef45c8 RG |
4865 | location_t loc = gimple_location (stmt); |
4866 | switch (gimple_code (stmt)) | |
4867 | { | |
4868 | case GIMPLE_ASSIGN: | |
4869 | { | |
4870 | enum tree_code subcode = gimple_assign_rhs_code (stmt); | |
4871 | ||
4872 | switch (get_gimple_rhs_class (subcode)) | |
4873 | { | |
4874 | case GIMPLE_SINGLE_RHS: | |
4875 | { | |
4876 | tree rhs = gimple_assign_rhs1 (stmt); | |
4877 | enum tree_code_class kind = TREE_CODE_CLASS (subcode); | |
4878 | ||
4879 | if (TREE_CODE (rhs) == SSA_NAME) | |
4880 | { | |
4881 | /* If the RHS is an SSA_NAME, return its known constant value, | |
4882 | if any. */ | |
4883 | return (*valueize) (rhs); | |
4884 | } | |
4885 | /* Handle propagating invariant addresses into address | |
4886 | operations. */ | |
4887 | else if (TREE_CODE (rhs) == ADDR_EXPR | |
4888 | && !is_gimple_min_invariant (rhs)) | |
4889 | { | |
d25c4172 | 4890 | HOST_WIDE_INT offset = 0; |
cfef45c8 RG |
4891 | tree base; |
4892 | base = get_addr_base_and_unit_offset_1 (TREE_OPERAND (rhs, 0), | |
4893 | &offset, | |
4894 | valueize); | |
4895 | if (base | |
4896 | && (CONSTANT_CLASS_P (base) | |
4897 | || decl_address_invariant_p (base))) | |
4898 | return build_invariant_address (TREE_TYPE (rhs), | |
4899 | base, offset); | |
4900 | } | |
4901 | else if (TREE_CODE (rhs) == CONSTRUCTOR | |
4902 | && TREE_CODE (TREE_TYPE (rhs)) == VECTOR_TYPE | |
4903 | && (CONSTRUCTOR_NELTS (rhs) | |
4904 | == TYPE_VECTOR_SUBPARTS (TREE_TYPE (rhs)))) | |
4905 | { | |
4906 | unsigned i; | |
d2a12ae7 | 4907 | tree val, *vec; |
cfef45c8 | 4908 | |
d2a12ae7 RG |
4909 | vec = XALLOCAVEC (tree, |
4910 | TYPE_VECTOR_SUBPARTS (TREE_TYPE (rhs))); | |
cfef45c8 RG |
4911 | FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (rhs), i, val) |
4912 | { | |
4913 | val = (*valueize) (val); | |
4914 | if (TREE_CODE (val) == INTEGER_CST | |
4915 | || TREE_CODE (val) == REAL_CST | |
4916 | || TREE_CODE (val) == FIXED_CST) | |
d2a12ae7 | 4917 | vec[i] = val; |
cfef45c8 RG |
4918 | else |
4919 | return NULL_TREE; | |
4920 | } | |
4921 | ||
d2a12ae7 | 4922 | return build_vector (TREE_TYPE (rhs), vec); |
cfef45c8 | 4923 | } |
bdf37f7a JH |
4924 | if (subcode == OBJ_TYPE_REF) |
4925 | { | |
4926 | tree val = (*valueize) (OBJ_TYPE_REF_EXPR (rhs)); | |
4927 | /* If callee is constant, we can fold away the wrapper. */ | |
4928 | if (is_gimple_min_invariant (val)) | |
4929 | return val; | |
4930 | } | |
cfef45c8 RG |
4931 | |
4932 | if (kind == tcc_reference) | |
4933 | { | |
4934 | if ((TREE_CODE (rhs) == VIEW_CONVERT_EXPR | |
4935 | || TREE_CODE (rhs) == REALPART_EXPR | |
4936 | || TREE_CODE (rhs) == IMAGPART_EXPR) | |
4937 | && TREE_CODE (TREE_OPERAND (rhs, 0)) == SSA_NAME) | |
4938 | { | |
4939 | tree val = (*valueize) (TREE_OPERAND (rhs, 0)); | |
4940 | return fold_unary_loc (EXPR_LOCATION (rhs), | |
4941 | TREE_CODE (rhs), | |
4942 | TREE_TYPE (rhs), val); | |
4943 | } | |
4944 | else if (TREE_CODE (rhs) == BIT_FIELD_REF | |
4945 | && TREE_CODE (TREE_OPERAND (rhs, 0)) == SSA_NAME) | |
4946 | { | |
4947 | tree val = (*valueize) (TREE_OPERAND (rhs, 0)); | |
4948 | return fold_ternary_loc (EXPR_LOCATION (rhs), | |
4949 | TREE_CODE (rhs), | |
4950 | TREE_TYPE (rhs), val, | |
4951 | TREE_OPERAND (rhs, 1), | |
4952 | TREE_OPERAND (rhs, 2)); | |
4953 | } | |
4954 | else if (TREE_CODE (rhs) == MEM_REF | |
4955 | && TREE_CODE (TREE_OPERAND (rhs, 0)) == SSA_NAME) | |
4956 | { | |
4957 | tree val = (*valueize) (TREE_OPERAND (rhs, 0)); | |
4958 | if (TREE_CODE (val) == ADDR_EXPR | |
4959 | && is_gimple_min_invariant (val)) | |
4960 | { | |
4961 | tree tem = fold_build2 (MEM_REF, TREE_TYPE (rhs), | |
4962 | unshare_expr (val), | |
4963 | TREE_OPERAND (rhs, 1)); | |
4964 | if (tem) | |
4965 | rhs = tem; | |
4966 | } | |
4967 | } | |
4968 | return fold_const_aggregate_ref_1 (rhs, valueize); | |
4969 | } | |
4970 | else if (kind == tcc_declaration) | |
4971 | return get_symbol_constant_value (rhs); | |
4972 | return rhs; | |
4973 | } | |
4974 | ||
4975 | case GIMPLE_UNARY_RHS: | |
f3582e54 | 4976 | return NULL_TREE; |
cfef45c8 RG |
4977 | |
4978 | case GIMPLE_BINARY_RHS: | |
4979 | { | |
4980 | /* Handle binary operators that can appear in GIMPLE form. */ | |
4981 | tree op0 = (*valueize) (gimple_assign_rhs1 (stmt)); | |
4982 | tree op1 = (*valueize) (gimple_assign_rhs2 (stmt)); | |
4983 | ||
4984 | /* Translate &x + CST into an invariant form suitable for | |
4985 | further propagation. */ | |
4986 | if (gimple_assign_rhs_code (stmt) == POINTER_PLUS_EXPR | |
4987 | && TREE_CODE (op0) == ADDR_EXPR | |
4988 | && TREE_CODE (op1) == INTEGER_CST) | |
4989 | { | |
4990 | tree off = fold_convert (ptr_type_node, op1); | |
4d59a001 RG |
4991 | return build_fold_addr_expr_loc |
4992 | (loc, | |
4993 | fold_build2 (MEM_REF, | |
cfef45c8 RG |
4994 | TREE_TYPE (TREE_TYPE (op0)), |
4995 | unshare_expr (op0), off)); | |
4996 | } | |
4997 | ||
4998 | return fold_binary_loc (loc, subcode, | |
4999 | gimple_expr_type (stmt), op0, op1); | |
5000 | } | |
5001 | ||
5002 | case GIMPLE_TERNARY_RHS: | |
5003 | { | |
5004 | /* Handle ternary operators that can appear in GIMPLE form. */ | |
5005 | tree op0 = (*valueize) (gimple_assign_rhs1 (stmt)); | |
5006 | tree op1 = (*valueize) (gimple_assign_rhs2 (stmt)); | |
5007 | tree op2 = (*valueize) (gimple_assign_rhs3 (stmt)); | |
5008 | ||
d3878abf RG |
5009 | /* Fold embedded expressions in ternary codes. */ |
5010 | if ((subcode == COND_EXPR | |
5011 | || subcode == VEC_COND_EXPR) | |
5012 | && COMPARISON_CLASS_P (op0)) | |
5013 | { | |
5014 | tree op00 = (*valueize) (TREE_OPERAND (op0, 0)); | |
5015 | tree op01 = (*valueize) (TREE_OPERAND (op0, 1)); | |
5016 | tree tem = fold_binary_loc (loc, TREE_CODE (op0), | |
5017 | TREE_TYPE (op0), op00, op01); | |
5018 | if (tem) | |
5019 | op0 = tem; | |
5020 | } | |
5021 | ||
cfef45c8 RG |
5022 | return fold_ternary_loc (loc, subcode, |
5023 | gimple_expr_type (stmt), op0, op1, op2); | |
5024 | } | |
5025 | ||
5026 | default: | |
5027 | gcc_unreachable (); | |
5028 | } | |
5029 | } | |
5030 | ||
5031 | case GIMPLE_CALL: | |
5032 | { | |
25583c4f | 5033 | tree fn; |
538dd0b7 | 5034 | gcall *call_stmt = as_a <gcall *> (stmt); |
25583c4f RS |
5035 | |
5036 | if (gimple_call_internal_p (stmt)) | |
31e071ae MP |
5037 | { |
5038 | enum tree_code subcode = ERROR_MARK; | |
5039 | switch (gimple_call_internal_fn (stmt)) | |
5040 | { | |
5041 | case IFN_UBSAN_CHECK_ADD: | |
5042 | subcode = PLUS_EXPR; | |
5043 | break; | |
5044 | case IFN_UBSAN_CHECK_SUB: | |
5045 | subcode = MINUS_EXPR; | |
5046 | break; | |
5047 | case IFN_UBSAN_CHECK_MUL: | |
5048 | subcode = MULT_EXPR; | |
5049 | break; | |
5050 | default: | |
5051 | return NULL_TREE; | |
5052 | } | |
368b454d JJ |
5053 | tree arg0 = gimple_call_arg (stmt, 0); |
5054 | tree arg1 = gimple_call_arg (stmt, 1); | |
5055 | tree op0 = (*valueize) (arg0); | |
5056 | tree op1 = (*valueize) (arg1); | |
31e071ae MP |
5057 | |
5058 | if (TREE_CODE (op0) != INTEGER_CST | |
5059 | || TREE_CODE (op1) != INTEGER_CST) | |
368b454d JJ |
5060 | { |
5061 | switch (subcode) | |
5062 | { | |
5063 | case MULT_EXPR: | |
5064 | /* x * 0 = 0 * x = 0 without overflow. */ | |
5065 | if (integer_zerop (op0) || integer_zerop (op1)) | |
5066 | return build_zero_cst (TREE_TYPE (arg0)); | |
5067 | break; | |
5068 | case MINUS_EXPR: | |
5069 | /* y - y = 0 without overflow. */ | |
5070 | if (operand_equal_p (op0, op1, 0)) | |
5071 | return build_zero_cst (TREE_TYPE (arg0)); | |
5072 | break; | |
5073 | default: | |
5074 | break; | |
5075 | } | |
5076 | } | |
5077 | tree res | |
5078 | = fold_binary_loc (loc, subcode, TREE_TYPE (arg0), op0, op1); | |
31e071ae MP |
5079 | if (res |
5080 | && TREE_CODE (res) == INTEGER_CST | |
5081 | && !TREE_OVERFLOW (res)) | |
5082 | return res; | |
5083 | return NULL_TREE; | |
5084 | } | |
25583c4f RS |
5085 | |
5086 | fn = (*valueize) (gimple_call_fn (stmt)); | |
cfef45c8 RG |
5087 | if (TREE_CODE (fn) == ADDR_EXPR |
5088 | && TREE_CODE (TREE_OPERAND (fn, 0)) == FUNCTION_DECL | |
5c944c6c RB |
5089 | && DECL_BUILT_IN (TREE_OPERAND (fn, 0)) |
5090 | && gimple_builtin_call_types_compatible_p (stmt, | |
5091 | TREE_OPERAND (fn, 0))) | |
cfef45c8 RG |
5092 | { |
5093 | tree *args = XALLOCAVEC (tree, gimple_call_num_args (stmt)); | |
a6a0570f | 5094 | tree retval; |
cfef45c8 RG |
5095 | unsigned i; |
5096 | for (i = 0; i < gimple_call_num_args (stmt); ++i) | |
5097 | args[i] = (*valueize) (gimple_call_arg (stmt, i)); | |
a6a0570f | 5098 | retval = fold_builtin_call_array (loc, |
538dd0b7 | 5099 | gimple_call_return_type (call_stmt), |
cfef45c8 | 5100 | fn, gimple_call_num_args (stmt), args); |
cfef45c8 | 5101 | if (retval) |
5c944c6c RB |
5102 | { |
5103 | /* fold_call_expr wraps the result inside a NOP_EXPR. */ | |
5104 | STRIP_NOPS (retval); | |
538dd0b7 DM |
5105 | retval = fold_convert (gimple_call_return_type (call_stmt), |
5106 | retval); | |
5c944c6c | 5107 | } |
cfef45c8 RG |
5108 | return retval; |
5109 | } | |
5110 | return NULL_TREE; | |
5111 | } | |
5112 | ||
5113 | default: | |
5114 | return NULL_TREE; | |
5115 | } | |
5116 | } | |
5117 | ||
5118 | /* Fold STMT to a constant using VALUEIZE to valueize SSA names. | |
5119 | Returns NULL_TREE if folding to a constant is not possible, otherwise | |
5120 | returns a constant according to is_gimple_min_invariant. */ | |
5121 | ||
5122 | tree | |
5123 | gimple_fold_stmt_to_constant (gimple stmt, tree (*valueize) (tree)) | |
5124 | { | |
5125 | tree res = gimple_fold_stmt_to_constant_1 (stmt, valueize); | |
5126 | if (res && is_gimple_min_invariant (res)) | |
5127 | return res; | |
5128 | return NULL_TREE; | |
5129 | } | |
5130 | ||
5131 | ||
5132 | /* The following set of functions are supposed to fold references using | |
5133 | their constant initializers. */ | |
5134 | ||
cfef45c8 RG |
5135 | /* See if we can find constructor defining value of BASE. |
5136 | When we know the consructor with constant offset (such as | |
5137 | base is array[40] and we do know constructor of array), then | |
5138 | BIT_OFFSET is adjusted accordingly. | |
5139 | ||
5140 | As a special case, return error_mark_node when constructor | |
5141 | is not explicitly available, but it is known to be zero | |
5142 | such as 'static const int a;'. */ | |
5143 | static tree | |
5144 | get_base_constructor (tree base, HOST_WIDE_INT *bit_offset, | |
5145 | tree (*valueize)(tree)) | |
5146 | { | |
5147 | HOST_WIDE_INT bit_offset2, size, max_size; | |
5148 | if (TREE_CODE (base) == MEM_REF) | |
5149 | { | |
5150 | if (!integer_zerop (TREE_OPERAND (base, 1))) | |
5151 | { | |
9541ffee | 5152 | if (!tree_fits_shwi_p (TREE_OPERAND (base, 1))) |
cfef45c8 | 5153 | return NULL_TREE; |
807e902e | 5154 | *bit_offset += (mem_ref_offset (base).to_short_addr () |
cfef45c8 RG |
5155 | * BITS_PER_UNIT); |
5156 | } | |
5157 | ||
5158 | if (valueize | |
5159 | && TREE_CODE (TREE_OPERAND (base, 0)) == SSA_NAME) | |
5160 | base = valueize (TREE_OPERAND (base, 0)); | |
5161 | if (!base || TREE_CODE (base) != ADDR_EXPR) | |
5162 | return NULL_TREE; | |
5163 | base = TREE_OPERAND (base, 0); | |
5164 | } | |
5165 | ||
5166 | /* Get a CONSTRUCTOR. If BASE is a VAR_DECL, get its | |
5167 | DECL_INITIAL. If BASE is a nested reference into another | |
5168 | ARRAY_REF or COMPONENT_REF, make a recursive call to resolve | |
5169 | the inner reference. */ | |
5170 | switch (TREE_CODE (base)) | |
5171 | { | |
5172 | case VAR_DECL: | |
cfef45c8 | 5173 | case CONST_DECL: |
6a6dac52 JH |
5174 | { |
5175 | tree init = ctor_for_folding (base); | |
5176 | ||
688010ba | 5177 | /* Our semantic is exact opposite of ctor_for_folding; |
6a6dac52 JH |
5178 | NULL means unknown, while error_mark_node is 0. */ |
5179 | if (init == error_mark_node) | |
5180 | return NULL_TREE; | |
5181 | if (!init) | |
5182 | return error_mark_node; | |
5183 | return init; | |
5184 | } | |
cfef45c8 RG |
5185 | |
5186 | case ARRAY_REF: | |
5187 | case COMPONENT_REF: | |
5188 | base = get_ref_base_and_extent (base, &bit_offset2, &size, &max_size); | |
5189 | if (max_size == -1 || size != max_size) | |
5190 | return NULL_TREE; | |
5191 | *bit_offset += bit_offset2; | |
5192 | return get_base_constructor (base, bit_offset, valueize); | |
5193 | ||
5194 | case STRING_CST: | |
5195 | case CONSTRUCTOR: | |
5196 | return base; | |
5197 | ||
5198 | default: | |
5199 | return NULL_TREE; | |
5200 | } | |
5201 | } | |
5202 | ||
cfef45c8 RG |
5203 | /* CTOR is CONSTRUCTOR of an array type. Fold reference of type TYPE and size |
5204 | SIZE to the memory at bit OFFSET. */ | |
5205 | ||
5206 | static tree | |
5207 | fold_array_ctor_reference (tree type, tree ctor, | |
5208 | unsigned HOST_WIDE_INT offset, | |
c44c2088 JH |
5209 | unsigned HOST_WIDE_INT size, |
5210 | tree from_decl) | |
cfef45c8 RG |
5211 | { |
5212 | unsigned HOST_WIDE_INT cnt; | |
5213 | tree cfield, cval; | |
807e902e KZ |
5214 | offset_int low_bound; |
5215 | offset_int elt_size; | |
5216 | offset_int index, max_index; | |
5217 | offset_int access_index; | |
b48e22b2 | 5218 | tree domain_type = NULL_TREE, index_type = NULL_TREE; |
cfef45c8 RG |
5219 | HOST_WIDE_INT inner_offset; |
5220 | ||
5221 | /* Compute low bound and elt size. */ | |
eb8f1123 RG |
5222 | if (TREE_CODE (TREE_TYPE (ctor)) == ARRAY_TYPE) |
5223 | domain_type = TYPE_DOMAIN (TREE_TYPE (ctor)); | |
cfef45c8 RG |
5224 | if (domain_type && TYPE_MIN_VALUE (domain_type)) |
5225 | { | |
5226 | /* Static constructors for variably sized objects makes no sense. */ | |
5227 | gcc_assert (TREE_CODE (TYPE_MIN_VALUE (domain_type)) == INTEGER_CST); | |
b48e22b2 | 5228 | index_type = TREE_TYPE (TYPE_MIN_VALUE (domain_type)); |
807e902e | 5229 | low_bound = wi::to_offset (TYPE_MIN_VALUE (domain_type)); |
cfef45c8 RG |
5230 | } |
5231 | else | |
807e902e | 5232 | low_bound = 0; |
cfef45c8 | 5233 | /* Static constructors for variably sized objects makes no sense. */ |
c3284718 | 5234 | gcc_assert (TREE_CODE (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (ctor)))) |
cfef45c8 | 5235 | == INTEGER_CST); |
807e902e | 5236 | elt_size = wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (ctor)))); |
cfef45c8 RG |
5237 | |
5238 | /* We can handle only constantly sized accesses that are known to not | |
5239 | be larger than size of array element. */ | |
5240 | if (!TYPE_SIZE_UNIT (type) | |
5241 | || TREE_CODE (TYPE_SIZE_UNIT (type)) != INTEGER_CST | |
807e902e KZ |
5242 | || wi::lts_p (elt_size, wi::to_offset (TYPE_SIZE_UNIT (type))) |
5243 | || elt_size == 0) | |
cfef45c8 RG |
5244 | return NULL_TREE; |
5245 | ||
5246 | /* Compute the array index we look for. */ | |
807e902e KZ |
5247 | access_index = wi::udiv_trunc (offset_int (offset / BITS_PER_UNIT), |
5248 | elt_size); | |
27bcd47c | 5249 | access_index += low_bound; |
b48e22b2 | 5250 | if (index_type) |
807e902e KZ |
5251 | access_index = wi::ext (access_index, TYPE_PRECISION (index_type), |
5252 | TYPE_SIGN (index_type)); | |
cfef45c8 RG |
5253 | |
5254 | /* And offset within the access. */ | |
27bcd47c | 5255 | inner_offset = offset % (elt_size.to_uhwi () * BITS_PER_UNIT); |
cfef45c8 RG |
5256 | |
5257 | /* See if the array field is large enough to span whole access. We do not | |
5258 | care to fold accesses spanning multiple array indexes. */ | |
27bcd47c | 5259 | if (inner_offset + size > elt_size.to_uhwi () * BITS_PER_UNIT) |
cfef45c8 RG |
5260 | return NULL_TREE; |
5261 | ||
807e902e | 5262 | index = low_bound - 1; |
b48e22b2 | 5263 | if (index_type) |
807e902e KZ |
5264 | index = wi::ext (index, TYPE_PRECISION (index_type), |
5265 | TYPE_SIGN (index_type)); | |
b48e22b2 | 5266 | |
cfef45c8 RG |
5267 | FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (ctor), cnt, cfield, cval) |
5268 | { | |
5269 | /* Array constructor might explicitely set index, or specify range | |
5270 | or leave index NULL meaning that it is next index after previous | |
5271 | one. */ | |
5272 | if (cfield) | |
5273 | { | |
5274 | if (TREE_CODE (cfield) == INTEGER_CST) | |
807e902e | 5275 | max_index = index = wi::to_offset (cfield); |
cfef45c8 RG |
5276 | else |
5277 | { | |
5278 | gcc_assert (TREE_CODE (cfield) == RANGE_EXPR); | |
807e902e KZ |
5279 | index = wi::to_offset (TREE_OPERAND (cfield, 0)); |
5280 | max_index = wi::to_offset (TREE_OPERAND (cfield, 1)); | |
cfef45c8 RG |
5281 | } |
5282 | } | |
5283 | else | |
b48e22b2 | 5284 | { |
807e902e | 5285 | index += 1; |
b48e22b2 | 5286 | if (index_type) |
807e902e KZ |
5287 | index = wi::ext (index, TYPE_PRECISION (index_type), |
5288 | TYPE_SIGN (index_type)); | |
b48e22b2 EB |
5289 | max_index = index; |
5290 | } | |
cfef45c8 RG |
5291 | |
5292 | /* Do we have match? */ | |
807e902e KZ |
5293 | if (wi::cmpu (access_index, index) >= 0 |
5294 | && wi::cmpu (access_index, max_index) <= 0) | |
c44c2088 JH |
5295 | return fold_ctor_reference (type, cval, inner_offset, size, |
5296 | from_decl); | |
cfef45c8 RG |
5297 | } |
5298 | /* When memory is not explicitely mentioned in constructor, | |
5299 | it is 0 (or out of range). */ | |
5300 | return build_zero_cst (type); | |
5301 | } | |
5302 | ||
5303 | /* CTOR is CONSTRUCTOR of an aggregate or vector. | |
5304 | Fold reference of type TYPE and size SIZE to the memory at bit OFFSET. */ | |
5305 | ||
5306 | static tree | |
5307 | fold_nonarray_ctor_reference (tree type, tree ctor, | |
5308 | unsigned HOST_WIDE_INT offset, | |
c44c2088 JH |
5309 | unsigned HOST_WIDE_INT size, |
5310 | tree from_decl) | |
cfef45c8 RG |
5311 | { |
5312 | unsigned HOST_WIDE_INT cnt; | |
5313 | tree cfield, cval; | |
5314 | ||
5315 | FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (ctor), cnt, cfield, | |
5316 | cval) | |
5317 | { | |
5318 | tree byte_offset = DECL_FIELD_OFFSET (cfield); | |
5319 | tree field_offset = DECL_FIELD_BIT_OFFSET (cfield); | |
5320 | tree field_size = DECL_SIZE (cfield); | |
807e902e KZ |
5321 | offset_int bitoffset; |
5322 | offset_int bitoffset_end, access_end; | |
cfef45c8 RG |
5323 | |
5324 | /* Variable sized objects in static constructors makes no sense, | |
5325 | but field_size can be NULL for flexible array members. */ | |
5326 | gcc_assert (TREE_CODE (field_offset) == INTEGER_CST | |
5327 | && TREE_CODE (byte_offset) == INTEGER_CST | |
5328 | && (field_size != NULL_TREE | |
5329 | ? TREE_CODE (field_size) == INTEGER_CST | |
5330 | : TREE_CODE (TREE_TYPE (cfield)) == ARRAY_TYPE)); | |
5331 | ||
5332 | /* Compute bit offset of the field. */ | |
807e902e KZ |
5333 | bitoffset = (wi::to_offset (field_offset) |
5334 | + wi::lshift (wi::to_offset (byte_offset), | |
5335 | LOG2_BITS_PER_UNIT)); | |
cfef45c8 RG |
5336 | /* Compute bit offset where the field ends. */ |
5337 | if (field_size != NULL_TREE) | |
807e902e | 5338 | bitoffset_end = bitoffset + wi::to_offset (field_size); |
cfef45c8 | 5339 | else |
807e902e | 5340 | bitoffset_end = 0; |
cfef45c8 | 5341 | |
807e902e | 5342 | access_end = offset_int (offset) + size; |
b8b2b009 JJ |
5343 | |
5344 | /* Is there any overlap between [OFFSET, OFFSET+SIZE) and | |
5345 | [BITOFFSET, BITOFFSET_END)? */ | |
807e902e | 5346 | if (wi::cmps (access_end, bitoffset) > 0 |
cfef45c8 | 5347 | && (field_size == NULL_TREE |
807e902e | 5348 | || wi::lts_p (offset, bitoffset_end))) |
cfef45c8 | 5349 | { |
807e902e | 5350 | offset_int inner_offset = offset_int (offset) - bitoffset; |
cfef45c8 RG |
5351 | /* We do have overlap. Now see if field is large enough to |
5352 | cover the access. Give up for accesses spanning multiple | |
5353 | fields. */ | |
807e902e | 5354 | if (wi::cmps (access_end, bitoffset_end) > 0) |
cfef45c8 | 5355 | return NULL_TREE; |
807e902e | 5356 | if (wi::lts_p (offset, bitoffset)) |
b8b2b009 | 5357 | return NULL_TREE; |
cfef45c8 | 5358 | return fold_ctor_reference (type, cval, |
27bcd47c | 5359 | inner_offset.to_uhwi (), size, |
c44c2088 | 5360 | from_decl); |
cfef45c8 RG |
5361 | } |
5362 | } | |
5363 | /* When memory is not explicitely mentioned in constructor, it is 0. */ | |
5364 | return build_zero_cst (type); | |
5365 | } | |
5366 | ||
5367 | /* CTOR is value initializing memory, fold reference of type TYPE and size SIZE | |
5368 | to the memory at bit OFFSET. */ | |
5369 | ||
8403c2cf | 5370 | tree |
cfef45c8 | 5371 | fold_ctor_reference (tree type, tree ctor, unsigned HOST_WIDE_INT offset, |
c44c2088 | 5372 | unsigned HOST_WIDE_INT size, tree from_decl) |
cfef45c8 RG |
5373 | { |
5374 | tree ret; | |
5375 | ||
5376 | /* We found the field with exact match. */ | |
5377 | if (useless_type_conversion_p (type, TREE_TYPE (ctor)) | |
5378 | && !offset) | |
9d60be38 | 5379 | return canonicalize_constructor_val (unshare_expr (ctor), from_decl); |
cfef45c8 RG |
5380 | |
5381 | /* We are at the end of walk, see if we can view convert the | |
5382 | result. */ | |
5383 | if (!AGGREGATE_TYPE_P (TREE_TYPE (ctor)) && !offset | |
5384 | /* VIEW_CONVERT_EXPR is defined only for matching sizes. */ | |
3d8208ce TP |
5385 | && !compare_tree_int (TYPE_SIZE (type), size) |
5386 | && !compare_tree_int (TYPE_SIZE (TREE_TYPE (ctor)), size)) | |
cfef45c8 | 5387 | { |
9d60be38 | 5388 | ret = canonicalize_constructor_val (unshare_expr (ctor), from_decl); |
cfef45c8 RG |
5389 | ret = fold_unary (VIEW_CONVERT_EXPR, type, ret); |
5390 | if (ret) | |
5391 | STRIP_NOPS (ret); | |
5392 | return ret; | |
5393 | } | |
b2505143 RB |
5394 | /* For constants and byte-aligned/sized reads try to go through |
5395 | native_encode/interpret. */ | |
5396 | if (CONSTANT_CLASS_P (ctor) | |
5397 | && BITS_PER_UNIT == 8 | |
5398 | && offset % BITS_PER_UNIT == 0 | |
5399 | && size % BITS_PER_UNIT == 0 | |
5400 | && size <= MAX_BITSIZE_MODE_ANY_MODE) | |
5401 | { | |
5402 | unsigned char buf[MAX_BITSIZE_MODE_ANY_MODE / BITS_PER_UNIT]; | |
5403 | if (native_encode_expr (ctor, buf, size / BITS_PER_UNIT, | |
5404 | offset / BITS_PER_UNIT) > 0) | |
5405 | return native_interpret_expr (type, buf, size / BITS_PER_UNIT); | |
5406 | } | |
cfef45c8 RG |
5407 | if (TREE_CODE (ctor) == CONSTRUCTOR) |
5408 | { | |
5409 | ||
eb8f1123 RG |
5410 | if (TREE_CODE (TREE_TYPE (ctor)) == ARRAY_TYPE |
5411 | || TREE_CODE (TREE_TYPE (ctor)) == VECTOR_TYPE) | |
c44c2088 JH |
5412 | return fold_array_ctor_reference (type, ctor, offset, size, |
5413 | from_decl); | |
cfef45c8 | 5414 | else |
c44c2088 JH |
5415 | return fold_nonarray_ctor_reference (type, ctor, offset, size, |
5416 | from_decl); | |
cfef45c8 RG |
5417 | } |
5418 | ||
5419 | return NULL_TREE; | |
5420 | } | |
5421 | ||
5422 | /* Return the tree representing the element referenced by T if T is an | |
5423 | ARRAY_REF or COMPONENT_REF into constant aggregates valuezing SSA | |
5424 | names using VALUEIZE. Return NULL_TREE otherwise. */ | |
5425 | ||
5426 | tree | |
5427 | fold_const_aggregate_ref_1 (tree t, tree (*valueize) (tree)) | |
5428 | { | |
5429 | tree ctor, idx, base; | |
5430 | HOST_WIDE_INT offset, size, max_size; | |
5431 | tree tem; | |
5432 | ||
f8a7df45 RG |
5433 | if (TREE_THIS_VOLATILE (t)) |
5434 | return NULL_TREE; | |
5435 | ||
cfef45c8 RG |
5436 | if (TREE_CODE_CLASS (TREE_CODE (t)) == tcc_declaration) |
5437 | return get_symbol_constant_value (t); | |
5438 | ||
5439 | tem = fold_read_from_constant_string (t); | |
5440 | if (tem) | |
5441 | return tem; | |
5442 | ||
5443 | switch (TREE_CODE (t)) | |
5444 | { | |
5445 | case ARRAY_REF: | |
5446 | case ARRAY_RANGE_REF: | |
5447 | /* Constant indexes are handled well by get_base_constructor. | |
5448 | Only special case variable offsets. | |
5449 | FIXME: This code can't handle nested references with variable indexes | |
5450 | (they will be handled only by iteration of ccp). Perhaps we can bring | |
5451 | get_ref_base_and_extent here and make it use a valueize callback. */ | |
5452 | if (TREE_CODE (TREE_OPERAND (t, 1)) == SSA_NAME | |
5453 | && valueize | |
5454 | && (idx = (*valueize) (TREE_OPERAND (t, 1))) | |
b48e22b2 | 5455 | && TREE_CODE (idx) == INTEGER_CST) |
cfef45c8 RG |
5456 | { |
5457 | tree low_bound, unit_size; | |
5458 | ||
5459 | /* If the resulting bit-offset is constant, track it. */ | |
5460 | if ((low_bound = array_ref_low_bound (t), | |
b48e22b2 | 5461 | TREE_CODE (low_bound) == INTEGER_CST) |
cfef45c8 | 5462 | && (unit_size = array_ref_element_size (t), |
807e902e | 5463 | tree_fits_uhwi_p (unit_size))) |
cfef45c8 | 5464 | { |
807e902e KZ |
5465 | offset_int woffset |
5466 | = wi::sext (wi::to_offset (idx) - wi::to_offset (low_bound), | |
5467 | TYPE_PRECISION (TREE_TYPE (idx))); | |
5468 | ||
5469 | if (wi::fits_shwi_p (woffset)) | |
5470 | { | |
5471 | offset = woffset.to_shwi (); | |
5472 | /* TODO: This code seems wrong, multiply then check | |
5473 | to see if it fits. */ | |
5474 | offset *= tree_to_uhwi (unit_size); | |
5475 | offset *= BITS_PER_UNIT; | |
5476 | ||
5477 | base = TREE_OPERAND (t, 0); | |
5478 | ctor = get_base_constructor (base, &offset, valueize); | |
5479 | /* Empty constructor. Always fold to 0. */ | |
5480 | if (ctor == error_mark_node) | |
5481 | return build_zero_cst (TREE_TYPE (t)); | |
5482 | /* Out of bound array access. Value is undefined, | |
5483 | but don't fold. */ | |
5484 | if (offset < 0) | |
5485 | return NULL_TREE; | |
5486 | /* We can not determine ctor. */ | |
5487 | if (!ctor) | |
5488 | return NULL_TREE; | |
5489 | return fold_ctor_reference (TREE_TYPE (t), ctor, offset, | |
5490 | tree_to_uhwi (unit_size) | |
5491 | * BITS_PER_UNIT, | |
5492 | base); | |
5493 | } | |
cfef45c8 RG |
5494 | } |
5495 | } | |
5496 | /* Fallthru. */ | |
5497 | ||
5498 | case COMPONENT_REF: | |
5499 | case BIT_FIELD_REF: | |
5500 | case TARGET_MEM_REF: | |
5501 | case MEM_REF: | |
5502 | base = get_ref_base_and_extent (t, &offset, &size, &max_size); | |
5503 | ctor = get_base_constructor (base, &offset, valueize); | |
5504 | ||
5505 | /* Empty constructor. Always fold to 0. */ | |
5506 | if (ctor == error_mark_node) | |
5507 | return build_zero_cst (TREE_TYPE (t)); | |
5508 | /* We do not know precise address. */ | |
5509 | if (max_size == -1 || max_size != size) | |
5510 | return NULL_TREE; | |
5511 | /* We can not determine ctor. */ | |
5512 | if (!ctor) | |
5513 | return NULL_TREE; | |
5514 | ||
5515 | /* Out of bound array access. Value is undefined, but don't fold. */ | |
5516 | if (offset < 0) | |
5517 | return NULL_TREE; | |
5518 | ||
c44c2088 JH |
5519 | return fold_ctor_reference (TREE_TYPE (t), ctor, offset, size, |
5520 | base); | |
cfef45c8 RG |
5521 | |
5522 | case REALPART_EXPR: | |
5523 | case IMAGPART_EXPR: | |
5524 | { | |
5525 | tree c = fold_const_aggregate_ref_1 (TREE_OPERAND (t, 0), valueize); | |
5526 | if (c && TREE_CODE (c) == COMPLEX_CST) | |
5527 | return fold_build1_loc (EXPR_LOCATION (t), | |
5528 | TREE_CODE (t), TREE_TYPE (t), c); | |
5529 | break; | |
5530 | } | |
5531 | ||
5532 | default: | |
5533 | break; | |
5534 | } | |
5535 | ||
5536 | return NULL_TREE; | |
5537 | } | |
5538 | ||
5539 | tree | |
5540 | fold_const_aggregate_ref (tree t) | |
5541 | { | |
5542 | return fold_const_aggregate_ref_1 (t, NULL); | |
5543 | } | |
06bc3ec7 | 5544 | |
85942f45 | 5545 | /* Lookup virtual method with index TOKEN in a virtual table V |
ec77d61f JH |
5546 | at OFFSET. |
5547 | Set CAN_REFER if non-NULL to false if method | |
5548 | is not referable or if the virtual table is ill-formed (such as rewriten | |
5549 | by non-C++ produced symbol). Otherwise just return NULL in that calse. */ | |
81fa35bd MJ |
5550 | |
5551 | tree | |
85942f45 JH |
5552 | gimple_get_virt_method_for_vtable (HOST_WIDE_INT token, |
5553 | tree v, | |
ec77d61f JH |
5554 | unsigned HOST_WIDE_INT offset, |
5555 | bool *can_refer) | |
81fa35bd | 5556 | { |
85942f45 JH |
5557 | tree vtable = v, init, fn; |
5558 | unsigned HOST_WIDE_INT size; | |
8c311b50 JH |
5559 | unsigned HOST_WIDE_INT elt_size, access_index; |
5560 | tree domain_type; | |
81fa35bd | 5561 | |
ec77d61f JH |
5562 | if (can_refer) |
5563 | *can_refer = true; | |
5564 | ||
9de2f554 | 5565 | /* First of all double check we have virtual table. */ |
81fa35bd | 5566 | if (TREE_CODE (v) != VAR_DECL |
2aa3da06 | 5567 | || !DECL_VIRTUAL_P (v)) |
ec77d61f JH |
5568 | { |
5569 | gcc_assert (in_lto_p); | |
5570 | /* Pass down that we lost track of the target. */ | |
5571 | if (can_refer) | |
5572 | *can_refer = false; | |
5573 | return NULL_TREE; | |
5574 | } | |
9de2f554 | 5575 | |
2aa3da06 JH |
5576 | init = ctor_for_folding (v); |
5577 | ||
9de2f554 | 5578 | /* The virtual tables should always be born with constructors |
2aa3da06 JH |
5579 | and we always should assume that they are avaialble for |
5580 | folding. At the moment we do not stream them in all cases, | |
5581 | but it should never happen that ctor seem unreachable. */ | |
5582 | gcc_assert (init); | |
5583 | if (init == error_mark_node) | |
5584 | { | |
5585 | gcc_assert (in_lto_p); | |
ec77d61f JH |
5586 | /* Pass down that we lost track of the target. */ |
5587 | if (can_refer) | |
5588 | *can_refer = false; | |
2aa3da06 JH |
5589 | return NULL_TREE; |
5590 | } | |
81fa35bd | 5591 | gcc_checking_assert (TREE_CODE (TREE_TYPE (v)) == ARRAY_TYPE); |
ae7e9ddd | 5592 | size = tree_to_uhwi (TYPE_SIZE (TREE_TYPE (TREE_TYPE (v)))); |
85942f45 | 5593 | offset *= BITS_PER_UNIT; |
81fa35bd | 5594 | offset += token * size; |
9de2f554 | 5595 | |
8c311b50 JH |
5596 | /* Lookup the value in the constructor that is assumed to be array. |
5597 | This is equivalent to | |
5598 | fn = fold_ctor_reference (TREE_TYPE (TREE_TYPE (v)), init, | |
5599 | offset, size, NULL); | |
5600 | but in a constant time. We expect that frontend produced a simple | |
5601 | array without indexed initializers. */ | |
5602 | ||
5603 | gcc_checking_assert (TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE); | |
5604 | domain_type = TYPE_DOMAIN (TREE_TYPE (init)); | |
5605 | gcc_checking_assert (integer_zerop (TYPE_MIN_VALUE (domain_type))); | |
5606 | elt_size = tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (init)))); | |
5607 | ||
5608 | access_index = offset / BITS_PER_UNIT / elt_size; | |
5609 | gcc_checking_assert (offset % (elt_size * BITS_PER_UNIT) == 0); | |
5610 | ||
5611 | /* This code makes an assumption that there are no | |
5612 | indexed fileds produced by C++ FE, so we can directly index the array. */ | |
5613 | if (access_index < CONSTRUCTOR_NELTS (init)) | |
5614 | { | |
5615 | fn = CONSTRUCTOR_ELT (init, access_index)->value; | |
5616 | gcc_checking_assert (!CONSTRUCTOR_ELT (init, access_index)->index); | |
5617 | STRIP_NOPS (fn); | |
5618 | } | |
5619 | else | |
5620 | fn = NULL; | |
9de2f554 JH |
5621 | |
5622 | /* For type inconsistent program we may end up looking up virtual method | |
5623 | in virtual table that does not contain TOKEN entries. We may overrun | |
5624 | the virtual table and pick up a constant or RTTI info pointer. | |
5625 | In any case the call is undefined. */ | |
5626 | if (!fn | |
5627 | || (TREE_CODE (fn) != ADDR_EXPR && TREE_CODE (fn) != FDESC_EXPR) | |
5628 | || TREE_CODE (TREE_OPERAND (fn, 0)) != FUNCTION_DECL) | |
5629 | fn = builtin_decl_implicit (BUILT_IN_UNREACHABLE); | |
5630 | else | |
5631 | { | |
5632 | fn = TREE_OPERAND (fn, 0); | |
5633 | ||
5634 | /* When cgraph node is missing and function is not public, we cannot | |
5635 | devirtualize. This can happen in WHOPR when the actual method | |
5636 | ends up in other partition, because we found devirtualization | |
5637 | possibility too late. */ | |
5638 | if (!can_refer_decl_in_current_unit_p (fn, vtable)) | |
ec77d61f JH |
5639 | { |
5640 | if (can_refer) | |
5641 | { | |
5642 | *can_refer = false; | |
5643 | return fn; | |
5644 | } | |
5645 | return NULL_TREE; | |
5646 | } | |
9de2f554 | 5647 | } |
81fa35bd | 5648 | |
7501ca28 RG |
5649 | /* Make sure we create a cgraph node for functions we'll reference. |
5650 | They can be non-existent if the reference comes from an entry | |
5651 | of an external vtable for example. */ | |
d52f5295 | 5652 | cgraph_node::get_create (fn); |
7501ca28 | 5653 | |
81fa35bd MJ |
5654 | return fn; |
5655 | } | |
5656 | ||
85942f45 JH |
5657 | /* Return a declaration of a function which an OBJ_TYPE_REF references. TOKEN |
5658 | is integer form of OBJ_TYPE_REF_TOKEN of the reference expression. | |
5659 | KNOWN_BINFO carries the binfo describing the true type of | |
ec77d61f JH |
5660 | OBJ_TYPE_REF_OBJECT(REF). |
5661 | Set CAN_REFER if non-NULL to false if method | |
5662 | is not referable or if the virtual table is ill-formed (such as rewriten | |
5663 | by non-C++ produced symbol). Otherwise just return NULL in that calse. */ | |
85942f45 JH |
5664 | |
5665 | tree | |
ec77d61f JH |
5666 | gimple_get_virt_method_for_binfo (HOST_WIDE_INT token, tree known_binfo, |
5667 | bool *can_refer) | |
85942f45 JH |
5668 | { |
5669 | unsigned HOST_WIDE_INT offset; | |
5670 | tree v; | |
5671 | ||
5672 | v = BINFO_VTABLE (known_binfo); | |
5673 | /* If there is no virtual methods table, leave the OBJ_TYPE_REF alone. */ | |
5674 | if (!v) | |
5675 | return NULL_TREE; | |
5676 | ||
5677 | if (!vtable_pointer_value_to_vtable (v, &v, &offset)) | |
ec77d61f JH |
5678 | { |
5679 | if (can_refer) | |
5680 | *can_refer = false; | |
5681 | return NULL_TREE; | |
5682 | } | |
5683 | return gimple_get_virt_method_for_vtable (token, v, offset, can_refer); | |
85942f45 JH |
5684 | } |
5685 | ||
06bc3ec7 BS |
5686 | /* Return true iff VAL is a gimple expression that is known to be |
5687 | non-negative. Restricted to floating-point inputs. */ | |
5688 | ||
5689 | bool | |
5690 | gimple_val_nonnegative_real_p (tree val) | |
5691 | { | |
5692 | gimple def_stmt; | |
5693 | ||
5694 | gcc_assert (val && SCALAR_FLOAT_TYPE_P (TREE_TYPE (val))); | |
5695 | ||
5696 | /* Use existing logic for non-gimple trees. */ | |
5697 | if (tree_expr_nonnegative_p (val)) | |
5698 | return true; | |
5699 | ||
5700 | if (TREE_CODE (val) != SSA_NAME) | |
5701 | return false; | |
5702 | ||
5703 | /* Currently we look only at the immediately defining statement | |
5704 | to make this determination, since recursion on defining | |
5705 | statements of operands can lead to quadratic behavior in the | |
5706 | worst case. This is expected to catch almost all occurrences | |
5707 | in practice. It would be possible to implement limited-depth | |
5708 | recursion if important cases are lost. Alternatively, passes | |
5709 | that need this information (such as the pow/powi lowering code | |
5710 | in the cse_sincos pass) could be revised to provide it through | |
5711 | dataflow propagation. */ | |
5712 | ||
5713 | def_stmt = SSA_NAME_DEF_STMT (val); | |
5714 | ||
5715 | if (is_gimple_assign (def_stmt)) | |
5716 | { | |
5717 | tree op0, op1; | |
5718 | ||
5719 | /* See fold-const.c:tree_expr_nonnegative_p for additional | |
5720 | cases that could be handled with recursion. */ | |
5721 | ||
5722 | switch (gimple_assign_rhs_code (def_stmt)) | |
5723 | { | |
5724 | case ABS_EXPR: | |
5725 | /* Always true for floating-point operands. */ | |
5726 | return true; | |
5727 | ||
5728 | case MULT_EXPR: | |
5729 | /* True if the two operands are identical (since we are | |
5730 | restricted to floating-point inputs). */ | |
5731 | op0 = gimple_assign_rhs1 (def_stmt); | |
5732 | op1 = gimple_assign_rhs2 (def_stmt); | |
5733 | ||
5734 | if (op0 == op1 | |
5735 | || operand_equal_p (op0, op1, 0)) | |
5736 | return true; | |
5737 | ||
5738 | default: | |
5739 | return false; | |
5740 | } | |
5741 | } | |
5742 | else if (is_gimple_call (def_stmt)) | |
5743 | { | |
5744 | tree fndecl = gimple_call_fndecl (def_stmt); | |
5745 | if (fndecl | |
5746 | && DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_NORMAL) | |
5747 | { | |
5748 | tree arg1; | |
5749 | ||
5750 | switch (DECL_FUNCTION_CODE (fndecl)) | |
5751 | { | |
5752 | CASE_FLT_FN (BUILT_IN_ACOS): | |
5753 | CASE_FLT_FN (BUILT_IN_ACOSH): | |
5754 | CASE_FLT_FN (BUILT_IN_CABS): | |
5755 | CASE_FLT_FN (BUILT_IN_COSH): | |
5756 | CASE_FLT_FN (BUILT_IN_ERFC): | |
5757 | CASE_FLT_FN (BUILT_IN_EXP): | |
5758 | CASE_FLT_FN (BUILT_IN_EXP10): | |
5759 | CASE_FLT_FN (BUILT_IN_EXP2): | |
5760 | CASE_FLT_FN (BUILT_IN_FABS): | |
5761 | CASE_FLT_FN (BUILT_IN_FDIM): | |
5762 | CASE_FLT_FN (BUILT_IN_HYPOT): | |
5763 | CASE_FLT_FN (BUILT_IN_POW10): | |
5764 | return true; | |
5765 | ||
5766 | CASE_FLT_FN (BUILT_IN_SQRT): | |
5767 | /* sqrt(-0.0) is -0.0, and sqrt is not defined over other | |
5768 | nonnegative inputs. */ | |
5769 | if (!HONOR_SIGNED_ZEROS (TYPE_MODE (TREE_TYPE (val)))) | |
5770 | return true; | |
5771 | ||
5772 | break; | |
5773 | ||
5774 | CASE_FLT_FN (BUILT_IN_POWI): | |
5775 | /* True if the second argument is an even integer. */ | |
5776 | arg1 = gimple_call_arg (def_stmt, 1); | |
5777 | ||
5778 | if (TREE_CODE (arg1) == INTEGER_CST | |
5779 | && (TREE_INT_CST_LOW (arg1) & 1) == 0) | |
5780 | return true; | |
5781 | ||
5782 | break; | |
5783 | ||
5784 | CASE_FLT_FN (BUILT_IN_POW): | |
5785 | /* True if the second argument is an even integer-valued | |
5786 | real. */ | |
5787 | arg1 = gimple_call_arg (def_stmt, 1); | |
5788 | ||
5789 | if (TREE_CODE (arg1) == REAL_CST) | |
5790 | { | |
5791 | REAL_VALUE_TYPE c; | |
5792 | HOST_WIDE_INT n; | |
5793 | ||
5794 | c = TREE_REAL_CST (arg1); | |
5795 | n = real_to_integer (&c); | |
5796 | ||
5797 | if ((n & 1) == 0) | |
5798 | { | |
5799 | REAL_VALUE_TYPE cint; | |
807e902e | 5800 | real_from_integer (&cint, VOIDmode, n, SIGNED); |
06bc3ec7 BS |
5801 | if (real_identical (&c, &cint)) |
5802 | return true; | |
5803 | } | |
5804 | } | |
5805 | ||
5806 | break; | |
5807 | ||
5808 | default: | |
5809 | return false; | |
5810 | } | |
5811 | } | |
5812 | } | |
5813 | ||
5814 | return false; | |
5815 | } | |
b184c8f1 AM |
5816 | |
5817 | /* Given a pointer value OP0, return a simplified version of an | |
5818 | indirection through OP0, or NULL_TREE if no simplification is | |
5819 | possible. Note that the resulting type may be different from | |
5820 | the type pointed to in the sense that it is still compatible | |
5821 | from the langhooks point of view. */ | |
5822 | ||
5823 | tree | |
5824 | gimple_fold_indirect_ref (tree t) | |
5825 | { | |
5826 | tree ptype = TREE_TYPE (t), type = TREE_TYPE (ptype); | |
5827 | tree sub = t; | |
5828 | tree subtype; | |
5829 | ||
5830 | STRIP_NOPS (sub); | |
5831 | subtype = TREE_TYPE (sub); | |
5832 | if (!POINTER_TYPE_P (subtype)) | |
5833 | return NULL_TREE; | |
5834 | ||
5835 | if (TREE_CODE (sub) == ADDR_EXPR) | |
5836 | { | |
5837 | tree op = TREE_OPERAND (sub, 0); | |
5838 | tree optype = TREE_TYPE (op); | |
5839 | /* *&p => p */ | |
5840 | if (useless_type_conversion_p (type, optype)) | |
5841 | return op; | |
5842 | ||
5843 | /* *(foo *)&fooarray => fooarray[0] */ | |
5844 | if (TREE_CODE (optype) == ARRAY_TYPE | |
5845 | && TREE_CODE (TYPE_SIZE (TREE_TYPE (optype))) == INTEGER_CST | |
5846 | && useless_type_conversion_p (type, TREE_TYPE (optype))) | |
5847 | { | |
5848 | tree type_domain = TYPE_DOMAIN (optype); | |
5849 | tree min_val = size_zero_node; | |
5850 | if (type_domain && TYPE_MIN_VALUE (type_domain)) | |
5851 | min_val = TYPE_MIN_VALUE (type_domain); | |
5852 | if (TREE_CODE (min_val) == INTEGER_CST) | |
5853 | return build4 (ARRAY_REF, type, op, min_val, NULL_TREE, NULL_TREE); | |
5854 | } | |
5855 | /* *(foo *)&complexfoo => __real__ complexfoo */ | |
5856 | else if (TREE_CODE (optype) == COMPLEX_TYPE | |
5857 | && useless_type_conversion_p (type, TREE_TYPE (optype))) | |
5858 | return fold_build1 (REALPART_EXPR, type, op); | |
5859 | /* *(foo *)&vectorfoo => BIT_FIELD_REF<vectorfoo,...> */ | |
5860 | else if (TREE_CODE (optype) == VECTOR_TYPE | |
5861 | && useless_type_conversion_p (type, TREE_TYPE (optype))) | |
5862 | { | |
5863 | tree part_width = TYPE_SIZE (type); | |
5864 | tree index = bitsize_int (0); | |
5865 | return fold_build3 (BIT_FIELD_REF, type, op, part_width, index); | |
5866 | } | |
5867 | } | |
5868 | ||
5869 | /* *(p + CST) -> ... */ | |
5870 | if (TREE_CODE (sub) == POINTER_PLUS_EXPR | |
5871 | && TREE_CODE (TREE_OPERAND (sub, 1)) == INTEGER_CST) | |
5872 | { | |
5873 | tree addr = TREE_OPERAND (sub, 0); | |
5874 | tree off = TREE_OPERAND (sub, 1); | |
5875 | tree addrtype; | |
5876 | ||
5877 | STRIP_NOPS (addr); | |
5878 | addrtype = TREE_TYPE (addr); | |
5879 | ||
5880 | /* ((foo*)&vectorfoo)[1] -> BIT_FIELD_REF<vectorfoo,...> */ | |
5881 | if (TREE_CODE (addr) == ADDR_EXPR | |
5882 | && TREE_CODE (TREE_TYPE (addrtype)) == VECTOR_TYPE | |
5883 | && useless_type_conversion_p (type, TREE_TYPE (TREE_TYPE (addrtype))) | |
cc269bb6 | 5884 | && tree_fits_uhwi_p (off)) |
b184c8f1 | 5885 | { |
ae7e9ddd | 5886 | unsigned HOST_WIDE_INT offset = tree_to_uhwi (off); |
b184c8f1 AM |
5887 | tree part_width = TYPE_SIZE (type); |
5888 | unsigned HOST_WIDE_INT part_widthi | |
9439e9a1 | 5889 | = tree_to_shwi (part_width) / BITS_PER_UNIT; |
b184c8f1 AM |
5890 | unsigned HOST_WIDE_INT indexi = offset * BITS_PER_UNIT; |
5891 | tree index = bitsize_int (indexi); | |
5892 | if (offset / part_widthi | |
e934916c | 5893 | < TYPE_VECTOR_SUBPARTS (TREE_TYPE (addrtype))) |
b184c8f1 AM |
5894 | return fold_build3 (BIT_FIELD_REF, type, TREE_OPERAND (addr, 0), |
5895 | part_width, index); | |
5896 | } | |
5897 | ||
5898 | /* ((foo*)&complexfoo)[1] -> __imag__ complexfoo */ | |
5899 | if (TREE_CODE (addr) == ADDR_EXPR | |
5900 | && TREE_CODE (TREE_TYPE (addrtype)) == COMPLEX_TYPE | |
5901 | && useless_type_conversion_p (type, TREE_TYPE (TREE_TYPE (addrtype)))) | |
5902 | { | |
5903 | tree size = TYPE_SIZE_UNIT (type); | |
5904 | if (tree_int_cst_equal (size, off)) | |
5905 | return fold_build1 (IMAGPART_EXPR, type, TREE_OPERAND (addr, 0)); | |
5906 | } | |
5907 | ||
5908 | /* *(p + CST) -> MEM_REF <p, CST>. */ | |
5909 | if (TREE_CODE (addr) != ADDR_EXPR | |
5910 | || DECL_P (TREE_OPERAND (addr, 0))) | |
5911 | return fold_build2 (MEM_REF, type, | |
5912 | addr, | |
807e902e | 5913 | wide_int_to_tree (ptype, off)); |
b184c8f1 AM |
5914 | } |
5915 | ||
5916 | /* *(foo *)fooarrptr => (*fooarrptr)[0] */ | |
5917 | if (TREE_CODE (TREE_TYPE (subtype)) == ARRAY_TYPE | |
5918 | && TREE_CODE (TYPE_SIZE (TREE_TYPE (TREE_TYPE (subtype)))) == INTEGER_CST | |
5919 | && useless_type_conversion_p (type, TREE_TYPE (TREE_TYPE (subtype)))) | |
5920 | { | |
5921 | tree type_domain; | |
5922 | tree min_val = size_zero_node; | |
5923 | tree osub = sub; | |
5924 | sub = gimple_fold_indirect_ref (sub); | |
5925 | if (! sub) | |
5926 | sub = build1 (INDIRECT_REF, TREE_TYPE (subtype), osub); | |
5927 | type_domain = TYPE_DOMAIN (TREE_TYPE (sub)); | |
5928 | if (type_domain && TYPE_MIN_VALUE (type_domain)) | |
5929 | min_val = TYPE_MIN_VALUE (type_domain); | |
5930 | if (TREE_CODE (min_val) == INTEGER_CST) | |
5931 | return build4 (ARRAY_REF, type, sub, min_val, NULL_TREE, NULL_TREE); | |
5932 | } | |
5933 | ||
5934 | return NULL_TREE; | |
5935 | } | |
19e51b40 JJ |
5936 | |
5937 | /* Return true if CODE is an operation that when operating on signed | |
5938 | integer types involves undefined behavior on overflow and the | |
5939 | operation can be expressed with unsigned arithmetic. */ | |
5940 | ||
5941 | bool | |
5942 | arith_code_with_undefined_signed_overflow (tree_code code) | |
5943 | { | |
5944 | switch (code) | |
5945 | { | |
5946 | case PLUS_EXPR: | |
5947 | case MINUS_EXPR: | |
5948 | case MULT_EXPR: | |
5949 | case NEGATE_EXPR: | |
5950 | case POINTER_PLUS_EXPR: | |
5951 | return true; | |
5952 | default: | |
5953 | return false; | |
5954 | } | |
5955 | } | |
5956 | ||
5957 | /* Rewrite STMT, an assignment with a signed integer or pointer arithmetic | |
5958 | operation that can be transformed to unsigned arithmetic by converting | |
5959 | its operand, carrying out the operation in the corresponding unsigned | |
5960 | type and converting the result back to the original type. | |
5961 | ||
5962 | Returns a sequence of statements that replace STMT and also contain | |
5963 | a modified form of STMT itself. */ | |
5964 | ||
5965 | gimple_seq | |
5966 | rewrite_to_defined_overflow (gimple stmt) | |
5967 | { | |
5968 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
5969 | { | |
5970 | fprintf (dump_file, "rewriting stmt with undefined signed " | |
5971 | "overflow "); | |
5972 | print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
5973 | } | |
5974 | ||
5975 | tree lhs = gimple_assign_lhs (stmt); | |
5976 | tree type = unsigned_type_for (TREE_TYPE (lhs)); | |
5977 | gimple_seq stmts = NULL; | |
5978 | for (unsigned i = 1; i < gimple_num_ops (stmt); ++i) | |
5979 | { | |
5980 | gimple_seq stmts2 = NULL; | |
5981 | gimple_set_op (stmt, i, | |
5982 | force_gimple_operand (fold_convert (type, | |
5983 | gimple_op (stmt, i)), | |
5984 | &stmts2, true, NULL_TREE)); | |
5985 | gimple_seq_add_seq (&stmts, stmts2); | |
5986 | } | |
5987 | gimple_assign_set_lhs (stmt, make_ssa_name (type, stmt)); | |
5988 | if (gimple_assign_rhs_code (stmt) == POINTER_PLUS_EXPR) | |
5989 | gimple_assign_set_rhs_code (stmt, PLUS_EXPR); | |
5990 | gimple_seq_add_stmt (&stmts, stmt); | |
0d0e4a03 | 5991 | gimple cvt = gimple_build_assign (lhs, NOP_EXPR, gimple_assign_lhs (stmt)); |
19e51b40 JJ |
5992 | gimple_seq_add_stmt (&stmts, cvt); |
5993 | ||
5994 | return stmts; | |
5995 | } | |
d4f5cd5e | 5996 | |
3d2cf79f RB |
5997 | |
5998 | /* Build the expression CODE OP0 of type TYPE with location LOC, | |
5999 | simplifying it first if possible using VALUEIZE if not NULL. | |
6000 | OP0 is expected to be valueized already. Returns the built | |
6001 | expression value and appends statements possibly defining it | |
6002 | to SEQ. */ | |
6003 | ||
6004 | tree | |
6005 | gimple_build (gimple_seq *seq, location_t loc, | |
6006 | enum tree_code code, tree type, tree op0, | |
6007 | tree (*valueize)(tree)) | |
6008 | { | |
6009 | tree res = gimple_simplify (code, type, op0, seq, valueize); | |
6010 | if (!res) | |
6011 | { | |
6012 | if (gimple_in_ssa_p (cfun)) | |
b731b390 | 6013 | res = make_ssa_name (type); |
3d2cf79f | 6014 | else |
b731b390 | 6015 | res = create_tmp_reg (type); |
3d2cf79f RB |
6016 | gimple stmt; |
6017 | if (code == REALPART_EXPR | |
6018 | || code == IMAGPART_EXPR | |
6019 | || code == VIEW_CONVERT_EXPR) | |
0d0e4a03 | 6020 | stmt = gimple_build_assign (res, code, build1 (code, type, op0)); |
3d2cf79f | 6021 | else |
0d0e4a03 | 6022 | stmt = gimple_build_assign (res, code, op0); |
3d2cf79f RB |
6023 | gimple_set_location (stmt, loc); |
6024 | gimple_seq_add_stmt_without_update (seq, stmt); | |
6025 | } | |
6026 | return res; | |
6027 | } | |
6028 | ||
6029 | /* Build the expression OP0 CODE OP1 of type TYPE with location LOC, | |
6030 | simplifying it first if possible using VALUEIZE if not NULL. | |
6031 | OP0 and OP1 are expected to be valueized already. Returns the built | |
6032 | expression value and appends statements possibly defining it | |
6033 | to SEQ. */ | |
6034 | ||
6035 | tree | |
6036 | gimple_build (gimple_seq *seq, location_t loc, | |
6037 | enum tree_code code, tree type, tree op0, tree op1, | |
6038 | tree (*valueize)(tree)) | |
6039 | { | |
6040 | tree res = gimple_simplify (code, type, op0, op1, seq, valueize); | |
6041 | if (!res) | |
6042 | { | |
6043 | if (gimple_in_ssa_p (cfun)) | |
b731b390 | 6044 | res = make_ssa_name (type); |
3d2cf79f | 6045 | else |
b731b390 | 6046 | res = create_tmp_reg (type); |
0d0e4a03 | 6047 | gimple stmt = gimple_build_assign (res, code, op0, op1); |
3d2cf79f RB |
6048 | gimple_set_location (stmt, loc); |
6049 | gimple_seq_add_stmt_without_update (seq, stmt); | |
6050 | } | |
6051 | return res; | |
6052 | } | |
6053 | ||
6054 | /* Build the expression (CODE OP0 OP1 OP2) of type TYPE with location LOC, | |
6055 | simplifying it first if possible using VALUEIZE if not NULL. | |
6056 | OP0, OP1 and OP2 are expected to be valueized already. Returns the built | |
6057 | expression value and appends statements possibly defining it | |
6058 | to SEQ. */ | |
6059 | ||
6060 | tree | |
6061 | gimple_build (gimple_seq *seq, location_t loc, | |
6062 | enum tree_code code, tree type, tree op0, tree op1, tree op2, | |
6063 | tree (*valueize)(tree)) | |
6064 | { | |
6065 | tree res = gimple_simplify (code, type, op0, op1, op2, | |
6066 | seq, valueize); | |
6067 | if (!res) | |
6068 | { | |
6069 | if (gimple_in_ssa_p (cfun)) | |
b731b390 | 6070 | res = make_ssa_name (type); |
3d2cf79f | 6071 | else |
b731b390 | 6072 | res = create_tmp_reg (type); |
3d2cf79f RB |
6073 | gimple stmt; |
6074 | if (code == BIT_FIELD_REF) | |
0d0e4a03 JJ |
6075 | stmt = gimple_build_assign (res, code, |
6076 | build3 (code, type, op0, op1, op2)); | |
3d2cf79f | 6077 | else |
0d0e4a03 | 6078 | stmt = gimple_build_assign (res, code, op0, op1, op2); |
3d2cf79f RB |
6079 | gimple_set_location (stmt, loc); |
6080 | gimple_seq_add_stmt_without_update (seq, stmt); | |
6081 | } | |
6082 | return res; | |
6083 | } | |
6084 | ||
6085 | /* Build the call FN (ARG0) with a result of type TYPE | |
6086 | (or no result if TYPE is void) with location LOC, | |
6087 | simplifying it first if possible using VALUEIZE if not NULL. | |
6088 | ARG0 is expected to be valueized already. Returns the built | |
6089 | expression value (or NULL_TREE if TYPE is void) and appends | |
6090 | statements possibly defining it to SEQ. */ | |
6091 | ||
6092 | tree | |
6093 | gimple_build (gimple_seq *seq, location_t loc, | |
6094 | enum built_in_function fn, tree type, tree arg0, | |
6095 | tree (*valueize)(tree)) | |
6096 | { | |
6097 | tree res = gimple_simplify (fn, type, arg0, seq, valueize); | |
6098 | if (!res) | |
6099 | { | |
6100 | tree decl = builtin_decl_implicit (fn); | |
6101 | gimple stmt = gimple_build_call (decl, 1, arg0); | |
6102 | if (!VOID_TYPE_P (type)) | |
6103 | { | |
6104 | if (gimple_in_ssa_p (cfun)) | |
b731b390 | 6105 | res = make_ssa_name (type); |
3d2cf79f | 6106 | else |
b731b390 | 6107 | res = create_tmp_reg (type); |
3d2cf79f RB |
6108 | gimple_call_set_lhs (stmt, res); |
6109 | } | |
6110 | gimple_set_location (stmt, loc); | |
6111 | gimple_seq_add_stmt_without_update (seq, stmt); | |
6112 | } | |
6113 | return res; | |
6114 | } | |
6115 | ||
6116 | /* Build the call FN (ARG0, ARG1) with a result of type TYPE | |
6117 | (or no result if TYPE is void) with location LOC, | |
6118 | simplifying it first if possible using VALUEIZE if not NULL. | |
6119 | ARG0 is expected to be valueized already. Returns the built | |
6120 | expression value (or NULL_TREE if TYPE is void) and appends | |
6121 | statements possibly defining it to SEQ. */ | |
6122 | ||
6123 | tree | |
6124 | gimple_build (gimple_seq *seq, location_t loc, | |
6125 | enum built_in_function fn, tree type, tree arg0, tree arg1, | |
6126 | tree (*valueize)(tree)) | |
6127 | { | |
6128 | tree res = gimple_simplify (fn, type, arg0, arg1, seq, valueize); | |
6129 | if (!res) | |
6130 | { | |
6131 | tree decl = builtin_decl_implicit (fn); | |
6132 | gimple stmt = gimple_build_call (decl, 2, arg0, arg1); | |
6133 | if (!VOID_TYPE_P (type)) | |
6134 | { | |
6135 | if (gimple_in_ssa_p (cfun)) | |
b731b390 | 6136 | res = make_ssa_name (type); |
3d2cf79f | 6137 | else |
b731b390 | 6138 | res = create_tmp_reg (type); |
3d2cf79f RB |
6139 | gimple_call_set_lhs (stmt, res); |
6140 | } | |
6141 | gimple_set_location (stmt, loc); | |
6142 | gimple_seq_add_stmt_without_update (seq, stmt); | |
6143 | } | |
6144 | return res; | |
6145 | } | |
6146 | ||
6147 | /* Build the call FN (ARG0, ARG1, ARG2) with a result of type TYPE | |
6148 | (or no result if TYPE is void) with location LOC, | |
6149 | simplifying it first if possible using VALUEIZE if not NULL. | |
6150 | ARG0 is expected to be valueized already. Returns the built | |
6151 | expression value (or NULL_TREE if TYPE is void) and appends | |
6152 | statements possibly defining it to SEQ. */ | |
6153 | ||
6154 | tree | |
6155 | gimple_build (gimple_seq *seq, location_t loc, | |
6156 | enum built_in_function fn, tree type, | |
6157 | tree arg0, tree arg1, tree arg2, | |
6158 | tree (*valueize)(tree)) | |
6159 | { | |
6160 | tree res = gimple_simplify (fn, type, arg0, arg1, arg2, seq, valueize); | |
6161 | if (!res) | |
6162 | { | |
6163 | tree decl = builtin_decl_implicit (fn); | |
6164 | gimple stmt = gimple_build_call (decl, 3, arg0, arg1, arg2); | |
6165 | if (!VOID_TYPE_P (type)) | |
6166 | { | |
6167 | if (gimple_in_ssa_p (cfun)) | |
b731b390 | 6168 | res = make_ssa_name (type); |
3d2cf79f | 6169 | else |
b731b390 | 6170 | res = create_tmp_reg (type); |
3d2cf79f RB |
6171 | gimple_call_set_lhs (stmt, res); |
6172 | } | |
6173 | gimple_set_location (stmt, loc); | |
6174 | gimple_seq_add_stmt_without_update (seq, stmt); | |
6175 | } | |
6176 | return res; | |
6177 | } | |
6178 | ||
6179 | /* Build the conversion (TYPE) OP with a result of type TYPE | |
6180 | with location LOC if such conversion is neccesary in GIMPLE, | |
6181 | simplifying it first. | |
6182 | Returns the built expression value and appends | |
6183 | statements possibly defining it to SEQ. */ | |
d4f5cd5e RB |
6184 | |
6185 | tree | |
6186 | gimple_convert (gimple_seq *seq, location_t loc, tree type, tree op) | |
6187 | { | |
6188 | if (useless_type_conversion_p (type, TREE_TYPE (op))) | |
6189 | return op; | |
3d2cf79f | 6190 | return gimple_build (seq, loc, NOP_EXPR, type, op); |
d4f5cd5e | 6191 | } |