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cbdd87d4 | 1 | /* Statement simplification on GIMPLE. |
85ec4feb | 2 | Copyright (C) 2010-2018 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" | |
c7131fb2 | 24 | #include "backend.h" |
957060b5 AM |
25 | #include "target.h" |
26 | #include "rtl.h" | |
cbdd87d4 | 27 | #include "tree.h" |
c7131fb2 | 28 | #include "gimple.h" |
957060b5 | 29 | #include "predict.h" |
c7131fb2 | 30 | #include "ssa.h" |
957060b5 AM |
31 | #include "cgraph.h" |
32 | #include "gimple-pretty-print.h" | |
cc8bea0a | 33 | #include "gimple-ssa-warn-restrict.h" |
c7131fb2 | 34 | #include "fold-const.h" |
36566b39 PK |
35 | #include "stmt.h" |
36 | #include "expr.h" | |
37 | #include "stor-layout.h" | |
7ee2468b | 38 | #include "dumpfile.h" |
2fb9a547 | 39 | #include "gimple-fold.h" |
45b0be94 | 40 | #include "gimplify.h" |
5be5c238 | 41 | #include "gimple-iterator.h" |
442b4905 AM |
42 | #include "tree-into-ssa.h" |
43 | #include "tree-dfa.h" | |
025d57f0 | 44 | #include "tree-object-size.h" |
7a300452 | 45 | #include "tree-ssa.h" |
cbdd87d4 | 46 | #include "tree-ssa-propagate.h" |
450ad0cd | 47 | #include "ipa-utils.h" |
4484a35a | 48 | #include "tree-ssa-address.h" |
862d0b35 | 49 | #include "langhooks.h" |
19e51b40 | 50 | #include "gimplify-me.h" |
2b5f0895 | 51 | #include "dbgcnt.h" |
9b2b7279 | 52 | #include "builtins.h" |
e0ee10ed RB |
53 | #include "tree-eh.h" |
54 | #include "gimple-match.h" | |
48126138 | 55 | #include "gomp-constants.h" |
f869c12f | 56 | #include "optabs-query.h" |
629b3d75 | 57 | #include "omp-general.h" |
3de2a40e | 58 | #include "ipa-chkp.h" |
abd3a68c | 59 | #include "tree-cfg.h" |
a918bfbf | 60 | #include "fold-const-call.h" |
314e6352 ML |
61 | #include "stringpool.h" |
62 | #include "attribs.h" | |
45b2222a | 63 | #include "asan.h" |
025d57f0 MS |
64 | #include "diagnostic-core.h" |
65 | #include "intl.h" | |
6a33d0ff | 66 | #include "calls.h" |
5ebaa477 | 67 | #include "tree-vector-builder.h" |
cbdd87d4 | 68 | |
b3b9f3d0 | 69 | /* Return true when DECL can be referenced from current unit. |
c44c2088 JH |
70 | FROM_DECL (if non-null) specify constructor of variable DECL was taken from. |
71 | We can get declarations that are not possible to reference for various | |
72 | reasons: | |
1389294c | 73 | |
1389294c JH |
74 | 1) When analyzing C++ virtual tables. |
75 | C++ virtual tables do have known constructors even | |
76 | when they are keyed to other compilation unit. | |
77 | Those tables can contain pointers to methods and vars | |
78 | in other units. Those methods have both STATIC and EXTERNAL | |
79 | set. | |
80 | 2) In WHOPR mode devirtualization might lead to reference | |
81 | to method that was partitioned elsehwere. | |
82 | In this case we have static VAR_DECL or FUNCTION_DECL | |
83 | that has no corresponding callgraph/varpool node | |
b3b9f3d0 JH |
84 | declaring the body. |
85 | 3) COMDAT functions referred by external vtables that | |
3e89949e | 86 | we devirtualize only during final compilation stage. |
b3b9f3d0 JH |
87 | At this time we already decided that we will not output |
88 | the function body and thus we can't reference the symbol | |
89 | directly. */ | |
90 | ||
1389294c | 91 | static bool |
c44c2088 | 92 | can_refer_decl_in_current_unit_p (tree decl, tree from_decl) |
1389294c | 93 | { |
2c8326a5 | 94 | varpool_node *vnode; |
1389294c | 95 | struct cgraph_node *node; |
5e20cdc9 | 96 | symtab_node *snode; |
c44c2088 | 97 | |
00de328a | 98 | if (DECL_ABSTRACT_P (decl)) |
1632a686 JH |
99 | return false; |
100 | ||
101 | /* We are concerned only about static/external vars and functions. */ | |
102 | if ((!TREE_STATIC (decl) && !DECL_EXTERNAL (decl)) | |
8813a647 | 103 | || !VAR_OR_FUNCTION_DECL_P (decl)) |
1632a686 JH |
104 | return true; |
105 | ||
106 | /* Static objects can be referred only if they was not optimized out yet. */ | |
107 | if (!TREE_PUBLIC (decl) && !DECL_EXTERNAL (decl)) | |
108 | { | |
3aaf0529 JH |
109 | /* Before we start optimizing unreachable code we can be sure all |
110 | static objects are defined. */ | |
3dafb85c | 111 | if (symtab->function_flags_ready) |
3aaf0529 | 112 | return true; |
d52f5295 | 113 | snode = symtab_node::get (decl); |
3aaf0529 | 114 | if (!snode || !snode->definition) |
1632a686 | 115 | return false; |
7de90a6c | 116 | node = dyn_cast <cgraph_node *> (snode); |
1632a686 JH |
117 | return !node || !node->global.inlined_to; |
118 | } | |
119 | ||
6da8be89 | 120 | /* We will later output the initializer, so we can refer to it. |
c44c2088 | 121 | So we are concerned only when DECL comes from initializer of |
3aaf0529 | 122 | external var or var that has been optimized out. */ |
c44c2088 | 123 | if (!from_decl |
8813a647 | 124 | || !VAR_P (from_decl) |
3aaf0529 | 125 | || (!DECL_EXTERNAL (from_decl) |
9041d2e6 | 126 | && (vnode = varpool_node::get (from_decl)) != NULL |
3aaf0529 | 127 | && vnode->definition) |
6da8be89 | 128 | || (flag_ltrans |
9041d2e6 | 129 | && (vnode = varpool_node::get (from_decl)) != NULL |
6adda80b | 130 | && vnode->in_other_partition)) |
c44c2088 | 131 | return true; |
c44c2088 JH |
132 | /* We are folding reference from external vtable. The vtable may reffer |
133 | to a symbol keyed to other compilation unit. The other compilation | |
134 | unit may be in separate DSO and the symbol may be hidden. */ | |
135 | if (DECL_VISIBILITY_SPECIFIED (decl) | |
136 | && DECL_EXTERNAL (decl) | |
a33a931b | 137 | && DECL_VISIBILITY (decl) != VISIBILITY_DEFAULT |
d52f5295 | 138 | && (!(snode = symtab_node::get (decl)) || !snode->in_other_partition)) |
c44c2088 | 139 | return false; |
b3b9f3d0 JH |
140 | /* When function is public, we always can introduce new reference. |
141 | Exception are the COMDAT functions where introducing a direct | |
142 | reference imply need to include function body in the curren tunit. */ | |
143 | if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl)) | |
144 | return true; | |
3aaf0529 JH |
145 | /* We have COMDAT. We are going to check if we still have definition |
146 | or if the definition is going to be output in other partition. | |
147 | Bypass this when gimplifying; all needed functions will be produced. | |
c44c2088 JH |
148 | |
149 | As observed in PR20991 for already optimized out comdat virtual functions | |
073a8998 | 150 | it may be tempting to not necessarily give up because the copy will be |
c44c2088 JH |
151 | output elsewhere when corresponding vtable is output. |
152 | This is however not possible - ABI specify that COMDATs are output in | |
153 | units where they are used and when the other unit was compiled with LTO | |
154 | it is possible that vtable was kept public while the function itself | |
155 | was privatized. */ | |
3dafb85c | 156 | if (!symtab->function_flags_ready) |
b3b9f3d0 | 157 | return true; |
c44c2088 | 158 | |
d52f5295 | 159 | snode = symtab_node::get (decl); |
3aaf0529 JH |
160 | if (!snode |
161 | || ((!snode->definition || DECL_EXTERNAL (decl)) | |
162 | && (!snode->in_other_partition | |
163 | || (!snode->forced_by_abi && !snode->force_output)))) | |
164 | return false; | |
165 | node = dyn_cast <cgraph_node *> (snode); | |
166 | return !node || !node->global.inlined_to; | |
1389294c JH |
167 | } |
168 | ||
a15ebbcd ML |
169 | /* Create a temporary for TYPE for a statement STMT. If the current function |
170 | is in SSA form, a SSA name is created. Otherwise a temporary register | |
171 | is made. */ | |
172 | ||
edc19e03 WS |
173 | tree |
174 | create_tmp_reg_or_ssa_name (tree type, gimple *stmt) | |
a15ebbcd ML |
175 | { |
176 | if (gimple_in_ssa_p (cfun)) | |
177 | return make_ssa_name (type, stmt); | |
178 | else | |
179 | return create_tmp_reg (type); | |
180 | } | |
181 | ||
0038d4e0 | 182 | /* CVAL is value taken from DECL_INITIAL of variable. Try to transform it into |
c44c2088 JH |
183 | acceptable form for is_gimple_min_invariant. |
184 | FROM_DECL (if non-NULL) specify variable whose constructor contains CVAL. */ | |
17f39a39 JH |
185 | |
186 | tree | |
c44c2088 | 187 | canonicalize_constructor_val (tree cval, tree from_decl) |
17f39a39 | 188 | { |
50619002 EB |
189 | tree orig_cval = cval; |
190 | STRIP_NOPS (cval); | |
315f5f1b RG |
191 | if (TREE_CODE (cval) == POINTER_PLUS_EXPR |
192 | && TREE_CODE (TREE_OPERAND (cval, 1)) == INTEGER_CST) | |
17f39a39 | 193 | { |
315f5f1b RG |
194 | tree ptr = TREE_OPERAND (cval, 0); |
195 | if (is_gimple_min_invariant (ptr)) | |
196 | cval = build1_loc (EXPR_LOCATION (cval), | |
197 | ADDR_EXPR, TREE_TYPE (ptr), | |
198 | fold_build2 (MEM_REF, TREE_TYPE (TREE_TYPE (ptr)), | |
199 | ptr, | |
200 | fold_convert (ptr_type_node, | |
201 | TREE_OPERAND (cval, 1)))); | |
17f39a39 JH |
202 | } |
203 | if (TREE_CODE (cval) == ADDR_EXPR) | |
204 | { | |
5a27a197 RG |
205 | tree base = NULL_TREE; |
206 | if (TREE_CODE (TREE_OPERAND (cval, 0)) == COMPOUND_LITERAL_EXPR) | |
ca5f4331 MM |
207 | { |
208 | base = COMPOUND_LITERAL_EXPR_DECL (TREE_OPERAND (cval, 0)); | |
209 | if (base) | |
210 | TREE_OPERAND (cval, 0) = base; | |
211 | } | |
5a27a197 RG |
212 | else |
213 | base = get_base_address (TREE_OPERAND (cval, 0)); | |
7501ca28 RG |
214 | if (!base) |
215 | return NULL_TREE; | |
b3b9f3d0 | 216 | |
8813a647 | 217 | if (VAR_OR_FUNCTION_DECL_P (base) |
c44c2088 | 218 | && !can_refer_decl_in_current_unit_p (base, from_decl)) |
1389294c | 219 | return NULL_TREE; |
13f92e8d JJ |
220 | if (TREE_TYPE (base) == error_mark_node) |
221 | return NULL_TREE; | |
8813a647 | 222 | if (VAR_P (base)) |
46eb666a | 223 | TREE_ADDRESSABLE (base) = 1; |
7501ca28 RG |
224 | else if (TREE_CODE (base) == FUNCTION_DECL) |
225 | { | |
226 | /* Make sure we create a cgraph node for functions we'll reference. | |
227 | They can be non-existent if the reference comes from an entry | |
228 | of an external vtable for example. */ | |
d52f5295 | 229 | cgraph_node::get_create (base); |
7501ca28 | 230 | } |
0038d4e0 | 231 | /* Fixup types in global initializers. */ |
73aef89e RG |
232 | if (TREE_TYPE (TREE_TYPE (cval)) != TREE_TYPE (TREE_OPERAND (cval, 0))) |
233 | cval = build_fold_addr_expr (TREE_OPERAND (cval, 0)); | |
50619002 EB |
234 | |
235 | if (!useless_type_conversion_p (TREE_TYPE (orig_cval), TREE_TYPE (cval))) | |
236 | cval = fold_convert (TREE_TYPE (orig_cval), cval); | |
237 | return cval; | |
17f39a39 | 238 | } |
846abd0d RB |
239 | if (TREE_OVERFLOW_P (cval)) |
240 | return drop_tree_overflow (cval); | |
50619002 | 241 | return orig_cval; |
17f39a39 | 242 | } |
cbdd87d4 RG |
243 | |
244 | /* If SYM is a constant variable with known value, return the value. | |
245 | NULL_TREE is returned otherwise. */ | |
246 | ||
247 | tree | |
248 | get_symbol_constant_value (tree sym) | |
249 | { | |
6a6dac52 JH |
250 | tree val = ctor_for_folding (sym); |
251 | if (val != error_mark_node) | |
cbdd87d4 | 252 | { |
cbdd87d4 RG |
253 | if (val) |
254 | { | |
9d60be38 | 255 | val = canonicalize_constructor_val (unshare_expr (val), sym); |
1389294c | 256 | if (val && is_gimple_min_invariant (val)) |
17f39a39 | 257 | return val; |
1389294c JH |
258 | else |
259 | return NULL_TREE; | |
cbdd87d4 RG |
260 | } |
261 | /* Variables declared 'const' without an initializer | |
262 | have zero as the initializer if they may not be | |
263 | overridden at link or run time. */ | |
264 | if (!val | |
b8a8c472 | 265 | && is_gimple_reg_type (TREE_TYPE (sym))) |
e8160c9a | 266 | return build_zero_cst (TREE_TYPE (sym)); |
cbdd87d4 RG |
267 | } |
268 | ||
269 | return NULL_TREE; | |
270 | } | |
271 | ||
272 | ||
cbdd87d4 RG |
273 | |
274 | /* Subroutine of fold_stmt. We perform several simplifications of the | |
275 | memory reference tree EXPR and make sure to re-gimplify them properly | |
276 | after propagation of constant addresses. IS_LHS is true if the | |
277 | reference is supposed to be an lvalue. */ | |
278 | ||
279 | static tree | |
280 | maybe_fold_reference (tree expr, bool is_lhs) | |
281 | { | |
17f39a39 | 282 | tree result; |
cbdd87d4 | 283 | |
f0eddb90 RG |
284 | if ((TREE_CODE (expr) == VIEW_CONVERT_EXPR |
285 | || TREE_CODE (expr) == REALPART_EXPR | |
286 | || TREE_CODE (expr) == IMAGPART_EXPR) | |
287 | && CONSTANT_CLASS_P (TREE_OPERAND (expr, 0))) | |
288 | return fold_unary_loc (EXPR_LOCATION (expr), | |
289 | TREE_CODE (expr), | |
290 | TREE_TYPE (expr), | |
291 | TREE_OPERAND (expr, 0)); | |
292 | else if (TREE_CODE (expr) == BIT_FIELD_REF | |
293 | && CONSTANT_CLASS_P (TREE_OPERAND (expr, 0))) | |
294 | return fold_ternary_loc (EXPR_LOCATION (expr), | |
295 | TREE_CODE (expr), | |
296 | TREE_TYPE (expr), | |
297 | TREE_OPERAND (expr, 0), | |
298 | TREE_OPERAND (expr, 1), | |
299 | TREE_OPERAND (expr, 2)); | |
300 | ||
f0eddb90 RG |
301 | if (!is_lhs |
302 | && (result = fold_const_aggregate_ref (expr)) | |
303 | && is_gimple_min_invariant (result)) | |
304 | return result; | |
cbdd87d4 | 305 | |
cbdd87d4 RG |
306 | return NULL_TREE; |
307 | } | |
308 | ||
309 | ||
310 | /* Attempt to fold an assignment statement pointed-to by SI. Returns a | |
311 | replacement rhs for the statement or NULL_TREE if no simplification | |
312 | could be made. It is assumed that the operands have been previously | |
313 | folded. */ | |
314 | ||
315 | static tree | |
316 | fold_gimple_assign (gimple_stmt_iterator *si) | |
317 | { | |
355fe088 | 318 | gimple *stmt = gsi_stmt (*si); |
cbdd87d4 RG |
319 | enum tree_code subcode = gimple_assign_rhs_code (stmt); |
320 | location_t loc = gimple_location (stmt); | |
321 | ||
322 | tree result = NULL_TREE; | |
323 | ||
324 | switch (get_gimple_rhs_class (subcode)) | |
325 | { | |
326 | case GIMPLE_SINGLE_RHS: | |
327 | { | |
328 | tree rhs = gimple_assign_rhs1 (stmt); | |
329 | ||
8c00ba08 JW |
330 | if (TREE_CLOBBER_P (rhs)) |
331 | return NULL_TREE; | |
332 | ||
4e71066d | 333 | if (REFERENCE_CLASS_P (rhs)) |
cbdd87d4 RG |
334 | return maybe_fold_reference (rhs, false); |
335 | ||
bdf37f7a JH |
336 | else if (TREE_CODE (rhs) == OBJ_TYPE_REF) |
337 | { | |
338 | tree val = OBJ_TYPE_REF_EXPR (rhs); | |
339 | if (is_gimple_min_invariant (val)) | |
340 | return val; | |
f8a39967 | 341 | else if (flag_devirtualize && virtual_method_call_p (rhs)) |
bdf37f7a JH |
342 | { |
343 | bool final; | |
344 | vec <cgraph_node *>targets | |
f8a39967 | 345 | = possible_polymorphic_call_targets (rhs, stmt, &final); |
2b5f0895 | 346 | if (final && targets.length () <= 1 && dbg_cnt (devirt)) |
bdf37f7a | 347 | { |
2b5f0895 XDL |
348 | if (dump_enabled_p ()) |
349 | { | |
807b7d62 | 350 | location_t loc = gimple_location_safe (stmt); |
2b5f0895 XDL |
351 | dump_printf_loc (MSG_OPTIMIZED_LOCATIONS, loc, |
352 | "resolving virtual function address " | |
353 | "reference to function %s\n", | |
354 | targets.length () == 1 | |
355 | ? targets[0]->name () | |
3ef276e4 | 356 | : "NULL"); |
2b5f0895 | 357 | } |
3ef276e4 RB |
358 | if (targets.length () == 1) |
359 | { | |
360 | val = fold_convert (TREE_TYPE (val), | |
361 | build_fold_addr_expr_loc | |
362 | (loc, targets[0]->decl)); | |
363 | STRIP_USELESS_TYPE_CONVERSION (val); | |
364 | } | |
365 | else | |
366 | /* We can not use __builtin_unreachable here because it | |
367 | can not have address taken. */ | |
368 | val = build_int_cst (TREE_TYPE (val), 0); | |
bdf37f7a JH |
369 | return val; |
370 | } | |
371 | } | |
bdf37f7a | 372 | } |
7524f419 | 373 | |
cbdd87d4 RG |
374 | else if (TREE_CODE (rhs) == ADDR_EXPR) |
375 | { | |
70f34814 RG |
376 | tree ref = TREE_OPERAND (rhs, 0); |
377 | tree tem = maybe_fold_reference (ref, true); | |
378 | if (tem | |
379 | && TREE_CODE (tem) == MEM_REF | |
380 | && integer_zerop (TREE_OPERAND (tem, 1))) | |
381 | result = fold_convert (TREE_TYPE (rhs), TREE_OPERAND (tem, 0)); | |
382 | else if (tem) | |
cbdd87d4 RG |
383 | result = fold_convert (TREE_TYPE (rhs), |
384 | build_fold_addr_expr_loc (loc, tem)); | |
70f34814 RG |
385 | else if (TREE_CODE (ref) == MEM_REF |
386 | && integer_zerop (TREE_OPERAND (ref, 1))) | |
387 | result = fold_convert (TREE_TYPE (rhs), TREE_OPERAND (ref, 0)); | |
7524f419 RB |
388 | |
389 | if (result) | |
390 | { | |
391 | /* Strip away useless type conversions. Both the | |
392 | NON_LVALUE_EXPR that may have been added by fold, and | |
393 | "useless" type conversions that might now be apparent | |
394 | due to propagation. */ | |
395 | STRIP_USELESS_TYPE_CONVERSION (result); | |
396 | ||
397 | if (result != rhs && valid_gimple_rhs_p (result)) | |
398 | return result; | |
399 | } | |
cbdd87d4 RG |
400 | } |
401 | ||
402 | else if (TREE_CODE (rhs) == CONSTRUCTOR | |
7524f419 | 403 | && TREE_CODE (TREE_TYPE (rhs)) == VECTOR_TYPE) |
cbdd87d4 RG |
404 | { |
405 | /* Fold a constant vector CONSTRUCTOR to VECTOR_CST. */ | |
406 | unsigned i; | |
407 | tree val; | |
408 | ||
409 | FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (rhs), i, val) | |
7524f419 | 410 | if (! CONSTANT_CLASS_P (val)) |
cbdd87d4 RG |
411 | return NULL_TREE; |
412 | ||
413 | return build_vector_from_ctor (TREE_TYPE (rhs), | |
414 | CONSTRUCTOR_ELTS (rhs)); | |
415 | } | |
416 | ||
417 | else if (DECL_P (rhs)) | |
9d60be38 | 418 | return get_symbol_constant_value (rhs); |
cbdd87d4 RG |
419 | } |
420 | break; | |
421 | ||
422 | case GIMPLE_UNARY_RHS: | |
cbdd87d4 RG |
423 | break; |
424 | ||
425 | case GIMPLE_BINARY_RHS: | |
cbdd87d4 RG |
426 | break; |
427 | ||
0354c0c7 | 428 | case GIMPLE_TERNARY_RHS: |
5c099d40 RB |
429 | result = fold_ternary_loc (loc, subcode, |
430 | TREE_TYPE (gimple_assign_lhs (stmt)), | |
431 | gimple_assign_rhs1 (stmt), | |
432 | gimple_assign_rhs2 (stmt), | |
433 | gimple_assign_rhs3 (stmt)); | |
0354c0c7 BS |
434 | |
435 | if (result) | |
436 | { | |
437 | STRIP_USELESS_TYPE_CONVERSION (result); | |
438 | if (valid_gimple_rhs_p (result)) | |
439 | return result; | |
0354c0c7 BS |
440 | } |
441 | break; | |
442 | ||
cbdd87d4 RG |
443 | case GIMPLE_INVALID_RHS: |
444 | gcc_unreachable (); | |
445 | } | |
446 | ||
447 | return NULL_TREE; | |
448 | } | |
449 | ||
fef5a0d9 RB |
450 | |
451 | /* Replace a statement at *SI_P with a sequence of statements in STMTS, | |
452 | adjusting the replacement stmts location and virtual operands. | |
453 | If the statement has a lhs the last stmt in the sequence is expected | |
454 | to assign to that lhs. */ | |
455 | ||
456 | static void | |
457 | gsi_replace_with_seq_vops (gimple_stmt_iterator *si_p, gimple_seq stmts) | |
458 | { | |
355fe088 | 459 | gimple *stmt = gsi_stmt (*si_p); |
fef5a0d9 RB |
460 | |
461 | if (gimple_has_location (stmt)) | |
462 | annotate_all_with_location (stmts, gimple_location (stmt)); | |
463 | ||
464 | /* First iterate over the replacement statements backward, assigning | |
465 | virtual operands to their defining statements. */ | |
355fe088 | 466 | gimple *laststore = NULL; |
fef5a0d9 RB |
467 | for (gimple_stmt_iterator i = gsi_last (stmts); |
468 | !gsi_end_p (i); gsi_prev (&i)) | |
469 | { | |
355fe088 | 470 | gimple *new_stmt = gsi_stmt (i); |
fef5a0d9 RB |
471 | if ((gimple_assign_single_p (new_stmt) |
472 | && !is_gimple_reg (gimple_assign_lhs (new_stmt))) | |
473 | || (is_gimple_call (new_stmt) | |
474 | && (gimple_call_flags (new_stmt) | |
475 | & (ECF_NOVOPS | ECF_PURE | ECF_CONST | ECF_NORETURN)) == 0)) | |
476 | { | |
477 | tree vdef; | |
478 | if (!laststore) | |
479 | vdef = gimple_vdef (stmt); | |
480 | else | |
481 | vdef = make_ssa_name (gimple_vop (cfun), new_stmt); | |
482 | gimple_set_vdef (new_stmt, vdef); | |
483 | if (vdef && TREE_CODE (vdef) == SSA_NAME) | |
484 | SSA_NAME_DEF_STMT (vdef) = new_stmt; | |
485 | laststore = new_stmt; | |
486 | } | |
487 | } | |
488 | ||
489 | /* Second iterate over the statements forward, assigning virtual | |
490 | operands to their uses. */ | |
491 | tree reaching_vuse = gimple_vuse (stmt); | |
492 | for (gimple_stmt_iterator i = gsi_start (stmts); | |
493 | !gsi_end_p (i); gsi_next (&i)) | |
494 | { | |
355fe088 | 495 | gimple *new_stmt = gsi_stmt (i); |
fef5a0d9 RB |
496 | /* If the new statement possibly has a VUSE, update it with exact SSA |
497 | name we know will reach this one. */ | |
498 | if (gimple_has_mem_ops (new_stmt)) | |
499 | gimple_set_vuse (new_stmt, reaching_vuse); | |
500 | gimple_set_modified (new_stmt, true); | |
501 | if (gimple_vdef (new_stmt)) | |
502 | reaching_vuse = gimple_vdef (new_stmt); | |
503 | } | |
504 | ||
505 | /* If the new sequence does not do a store release the virtual | |
506 | definition of the original statement. */ | |
507 | if (reaching_vuse | |
508 | && reaching_vuse == gimple_vuse (stmt)) | |
509 | { | |
510 | tree vdef = gimple_vdef (stmt); | |
511 | if (vdef | |
512 | && TREE_CODE (vdef) == SSA_NAME) | |
513 | { | |
514 | unlink_stmt_vdef (stmt); | |
515 | release_ssa_name (vdef); | |
516 | } | |
517 | } | |
518 | ||
519 | /* Finally replace the original statement with the sequence. */ | |
520 | gsi_replace_with_seq (si_p, stmts, false); | |
521 | } | |
522 | ||
cbdd87d4 RG |
523 | /* Convert EXPR into a GIMPLE value suitable for substitution on the |
524 | RHS of an assignment. Insert the necessary statements before | |
525 | iterator *SI_P. The statement at *SI_P, which must be a GIMPLE_CALL | |
526 | is replaced. If the call is expected to produces a result, then it | |
527 | is replaced by an assignment of the new RHS to the result variable. | |
528 | If the result is to be ignored, then the call is replaced by a | |
fe2ef088 MM |
529 | GIMPLE_NOP. A proper VDEF chain is retained by making the first |
530 | VUSE and the last VDEF of the whole sequence be the same as the replaced | |
531 | statement and using new SSA names for stores in between. */ | |
cbdd87d4 RG |
532 | |
533 | void | |
534 | gimplify_and_update_call_from_tree (gimple_stmt_iterator *si_p, tree expr) | |
535 | { | |
536 | tree lhs; | |
355fe088 | 537 | gimple *stmt, *new_stmt; |
cbdd87d4 | 538 | gimple_stmt_iterator i; |
355a7673 | 539 | gimple_seq stmts = NULL; |
cbdd87d4 RG |
540 | |
541 | stmt = gsi_stmt (*si_p); | |
542 | ||
543 | gcc_assert (is_gimple_call (stmt)); | |
544 | ||
45852dcc | 545 | push_gimplify_context (gimple_in_ssa_p (cfun)); |
cbdd87d4 | 546 | |
e256dfce | 547 | lhs = gimple_call_lhs (stmt); |
cbdd87d4 | 548 | if (lhs == NULL_TREE) |
6e572326 RG |
549 | { |
550 | gimplify_and_add (expr, &stmts); | |
551 | /* We can end up with folding a memcpy of an empty class assignment | |
552 | which gets optimized away by C++ gimplification. */ | |
553 | if (gimple_seq_empty_p (stmts)) | |
554 | { | |
9fdc58de | 555 | pop_gimplify_context (NULL); |
6e572326 RG |
556 | if (gimple_in_ssa_p (cfun)) |
557 | { | |
558 | unlink_stmt_vdef (stmt); | |
559 | release_defs (stmt); | |
560 | } | |
f6b4dc28 | 561 | gsi_replace (si_p, gimple_build_nop (), false); |
6e572326 RG |
562 | return; |
563 | } | |
564 | } | |
cbdd87d4 | 565 | else |
e256dfce | 566 | { |
381cdae4 | 567 | tree tmp = force_gimple_operand (expr, &stmts, false, NULL_TREE); |
e256dfce RG |
568 | new_stmt = gimple_build_assign (lhs, tmp); |
569 | i = gsi_last (stmts); | |
570 | gsi_insert_after_without_update (&i, new_stmt, | |
571 | GSI_CONTINUE_LINKING); | |
572 | } | |
cbdd87d4 RG |
573 | |
574 | pop_gimplify_context (NULL); | |
575 | ||
fef5a0d9 RB |
576 | gsi_replace_with_seq_vops (si_p, stmts); |
577 | } | |
cbdd87d4 | 578 | |
fef5a0d9 RB |
579 | |
580 | /* Replace the call at *GSI with the gimple value VAL. */ | |
581 | ||
e3174bdf | 582 | void |
fef5a0d9 RB |
583 | replace_call_with_value (gimple_stmt_iterator *gsi, tree val) |
584 | { | |
355fe088 | 585 | gimple *stmt = gsi_stmt (*gsi); |
fef5a0d9 | 586 | tree lhs = gimple_call_lhs (stmt); |
355fe088 | 587 | gimple *repl; |
fef5a0d9 | 588 | if (lhs) |
e256dfce | 589 | { |
fef5a0d9 RB |
590 | if (!useless_type_conversion_p (TREE_TYPE (lhs), TREE_TYPE (val))) |
591 | val = fold_convert (TREE_TYPE (lhs), val); | |
592 | repl = gimple_build_assign (lhs, val); | |
593 | } | |
594 | else | |
595 | repl = gimple_build_nop (); | |
596 | tree vdef = gimple_vdef (stmt); | |
597 | if (vdef && TREE_CODE (vdef) == SSA_NAME) | |
598 | { | |
599 | unlink_stmt_vdef (stmt); | |
600 | release_ssa_name (vdef); | |
601 | } | |
f6b4dc28 | 602 | gsi_replace (gsi, repl, false); |
fef5a0d9 RB |
603 | } |
604 | ||
605 | /* Replace the call at *GSI with the new call REPL and fold that | |
606 | again. */ | |
607 | ||
608 | static void | |
355fe088 | 609 | replace_call_with_call_and_fold (gimple_stmt_iterator *gsi, gimple *repl) |
fef5a0d9 | 610 | { |
355fe088 | 611 | gimple *stmt = gsi_stmt (*gsi); |
fef5a0d9 RB |
612 | gimple_call_set_lhs (repl, gimple_call_lhs (stmt)); |
613 | gimple_set_location (repl, gimple_location (stmt)); | |
614 | if (gimple_vdef (stmt) | |
615 | && TREE_CODE (gimple_vdef (stmt)) == SSA_NAME) | |
616 | { | |
617 | gimple_set_vdef (repl, gimple_vdef (stmt)); | |
fef5a0d9 RB |
618 | SSA_NAME_DEF_STMT (gimple_vdef (repl)) = repl; |
619 | } | |
00296d7f JJ |
620 | if (gimple_vuse (stmt)) |
621 | gimple_set_vuse (repl, gimple_vuse (stmt)); | |
f6b4dc28 | 622 | gsi_replace (gsi, repl, false); |
fef5a0d9 RB |
623 | fold_stmt (gsi); |
624 | } | |
625 | ||
626 | /* Return true if VAR is a VAR_DECL or a component thereof. */ | |
627 | ||
628 | static bool | |
629 | var_decl_component_p (tree var) | |
630 | { | |
631 | tree inner = var; | |
632 | while (handled_component_p (inner)) | |
633 | inner = TREE_OPERAND (inner, 0); | |
634 | return SSA_VAR_P (inner); | |
635 | } | |
636 | ||
6512c0f1 MS |
637 | /* If the SIZE argument representing the size of an object is in a range |
638 | of values of which exactly one is valid (and that is zero), return | |
639 | true, otherwise false. */ | |
640 | ||
641 | static bool | |
642 | size_must_be_zero_p (tree size) | |
643 | { | |
644 | if (integer_zerop (size)) | |
645 | return true; | |
646 | ||
647 | if (TREE_CODE (size) != SSA_NAME) | |
648 | return false; | |
649 | ||
650 | wide_int min, max; | |
651 | enum value_range_type rtype = get_range_info (size, &min, &max); | |
652 | if (rtype != VR_ANTI_RANGE) | |
653 | return false; | |
654 | ||
655 | tree type = TREE_TYPE (size); | |
656 | int prec = TYPE_PRECISION (type); | |
657 | ||
658 | wide_int wone = wi::one (prec); | |
659 | ||
660 | /* Compute the value of SSIZE_MAX, the largest positive value that | |
661 | can be stored in ssize_t, the signed counterpart of size_t. */ | |
662 | wide_int ssize_max = wi::lshift (wi::one (prec), prec - 1) - 1; | |
663 | ||
664 | return wi::eq_p (min, wone) && wi::geu_p (max, ssize_max); | |
665 | } | |
666 | ||
cc8bea0a MS |
667 | /* Fold function call to builtin mem{{,p}cpy,move}. Try to detect and |
668 | diagnose (otherwise undefined) overlapping copies without preventing | |
669 | folding. When folded, GCC guarantees that overlapping memcpy has | |
670 | the same semantics as memmove. Call to the library memcpy need not | |
671 | provide the same guarantee. Return false if no simplification can | |
672 | be made. */ | |
fef5a0d9 RB |
673 | |
674 | static bool | |
675 | gimple_fold_builtin_memory_op (gimple_stmt_iterator *gsi, | |
676 | tree dest, tree src, int endp) | |
677 | { | |
355fe088 | 678 | gimple *stmt = gsi_stmt (*gsi); |
fef5a0d9 RB |
679 | tree lhs = gimple_call_lhs (stmt); |
680 | tree len = gimple_call_arg (stmt, 2); | |
681 | tree destvar, srcvar; | |
682 | location_t loc = gimple_location (stmt); | |
683 | ||
cc8bea0a MS |
684 | tree func = gimple_call_fndecl (stmt); |
685 | bool nowarn = gimple_no_warning_p (stmt); | |
686 | bool check_overlap = (DECL_FUNCTION_CODE (func) != BUILT_IN_MEMMOVE | |
687 | && DECL_FUNCTION_CODE (func) != BUILT_IN_MEMMOVE_CHK | |
688 | && !nowarn); | |
689 | ||
6512c0f1 MS |
690 | /* If the LEN parameter is a constant zero or in range where |
691 | the only valid value is zero, return DEST. */ | |
692 | if (size_must_be_zero_p (len)) | |
fef5a0d9 | 693 | { |
355fe088 | 694 | gimple *repl; |
fef5a0d9 RB |
695 | if (gimple_call_lhs (stmt)) |
696 | repl = gimple_build_assign (gimple_call_lhs (stmt), dest); | |
697 | else | |
698 | repl = gimple_build_nop (); | |
699 | tree vdef = gimple_vdef (stmt); | |
700 | if (vdef && TREE_CODE (vdef) == SSA_NAME) | |
e256dfce | 701 | { |
fef5a0d9 RB |
702 | unlink_stmt_vdef (stmt); |
703 | release_ssa_name (vdef); | |
704 | } | |
f6b4dc28 | 705 | gsi_replace (gsi, repl, false); |
fef5a0d9 RB |
706 | return true; |
707 | } | |
708 | ||
709 | /* If SRC and DEST are the same (and not volatile), return | |
710 | DEST{,+LEN,+LEN-1}. */ | |
711 | if (operand_equal_p (src, dest, 0)) | |
712 | { | |
cc8bea0a MS |
713 | /* Avoid diagnosing exact overlap in calls to __builtin_memcpy. |
714 | It's safe and may even be emitted by GCC itself (see bug | |
715 | 32667). However, diagnose it in explicit calls to the memcpy | |
716 | function. */ | |
717 | if (check_overlap && *IDENTIFIER_POINTER (DECL_NAME (func)) != '_') | |
718 | warning_at (loc, OPT_Wrestrict, | |
719 | "%qD source argument is the same as destination", | |
720 | func); | |
721 | ||
fef5a0d9 RB |
722 | unlink_stmt_vdef (stmt); |
723 | if (gimple_vdef (stmt) && TREE_CODE (gimple_vdef (stmt)) == SSA_NAME) | |
724 | release_ssa_name (gimple_vdef (stmt)); | |
725 | if (!lhs) | |
726 | { | |
f6b4dc28 | 727 | gsi_replace (gsi, gimple_build_nop (), false); |
fef5a0d9 RB |
728 | return true; |
729 | } | |
730 | goto done; | |
731 | } | |
732 | else | |
733 | { | |
734 | tree srctype, desttype; | |
735 | unsigned int src_align, dest_align; | |
736 | tree off0; | |
737 | ||
3de2a40e IE |
738 | /* Inlining of memcpy/memmove may cause bounds lost (if we copy |
739 | pointers as wide integer) and also may result in huge function | |
740 | size because of inlined bounds copy. Thus don't inline for | |
741 | functions we want to instrument. */ | |
742 | if (flag_check_pointer_bounds | |
743 | && chkp_instrumentable_p (cfun->decl) | |
744 | /* Even if data may contain pointers we can inline if copy | |
745 | less than a pointer size. */ | |
746 | && (!tree_fits_uhwi_p (len) | |
747 | || compare_tree_int (len, POINTER_SIZE_UNITS) >= 0)) | |
748 | return false; | |
749 | ||
fef5a0d9 RB |
750 | /* Build accesses at offset zero with a ref-all character type. */ |
751 | off0 = build_int_cst (build_pointer_type_for_mode (char_type_node, | |
752 | ptr_mode, true), 0); | |
753 | ||
754 | /* If we can perform the copy efficiently with first doing all loads | |
755 | and then all stores inline it that way. Currently efficiently | |
756 | means that we can load all the memory into a single integer | |
757 | register which is what MOVE_MAX gives us. */ | |
758 | src_align = get_pointer_alignment (src); | |
759 | dest_align = get_pointer_alignment (dest); | |
760 | if (tree_fits_uhwi_p (len) | |
761 | && compare_tree_int (len, MOVE_MAX) <= 0 | |
762 | /* ??? Don't transform copies from strings with known length this | |
763 | confuses the tree-ssa-strlen.c. This doesn't handle | |
764 | the case in gcc.dg/strlenopt-8.c which is XFAILed for that | |
765 | reason. */ | |
766 | && !c_strlen (src, 2)) | |
767 | { | |
768 | unsigned ilen = tree_to_uhwi (len); | |
146ec50f | 769 | if (pow2p_hwi (ilen)) |
fef5a0d9 | 770 | { |
cc8bea0a MS |
771 | /* Detect invalid bounds and overlapping copies and issue |
772 | either -Warray-bounds or -Wrestrict. */ | |
773 | if (!nowarn | |
774 | && check_bounds_or_overlap (as_a <gcall *>(stmt), | |
775 | dest, src, len, len)) | |
776 | gimple_set_no_warning (stmt, true); | |
777 | ||
64ab8765 | 778 | scalar_int_mode mode; |
fef5a0d9 RB |
779 | tree type = lang_hooks.types.type_for_size (ilen * 8, 1); |
780 | if (type | |
64ab8765 RS |
781 | && is_a <scalar_int_mode> (TYPE_MODE (type), &mode) |
782 | && GET_MODE_SIZE (mode) * BITS_PER_UNIT == ilen * 8 | |
fef5a0d9 RB |
783 | /* If the destination pointer is not aligned we must be able |
784 | to emit an unaligned store. */ | |
64ab8765 | 785 | && (dest_align >= GET_MODE_ALIGNMENT (mode) |
e0bd6c9f | 786 | || !targetm.slow_unaligned_access (mode, dest_align) |
64ab8765 | 787 | || (optab_handler (movmisalign_optab, mode) |
f869c12f | 788 | != CODE_FOR_nothing))) |
fef5a0d9 RB |
789 | { |
790 | tree srctype = type; | |
791 | tree desttype = type; | |
64ab8765 | 792 | if (src_align < GET_MODE_ALIGNMENT (mode)) |
fef5a0d9 RB |
793 | srctype = build_aligned_type (type, src_align); |
794 | tree srcmem = fold_build2 (MEM_REF, srctype, src, off0); | |
795 | tree tem = fold_const_aggregate_ref (srcmem); | |
796 | if (tem) | |
797 | srcmem = tem; | |
64ab8765 | 798 | else if (src_align < GET_MODE_ALIGNMENT (mode) |
e0bd6c9f | 799 | && targetm.slow_unaligned_access (mode, src_align) |
64ab8765 | 800 | && (optab_handler (movmisalign_optab, mode) |
f869c12f | 801 | == CODE_FOR_nothing)) |
fef5a0d9 RB |
802 | srcmem = NULL_TREE; |
803 | if (srcmem) | |
804 | { | |
355fe088 | 805 | gimple *new_stmt; |
fef5a0d9 RB |
806 | if (is_gimple_reg_type (TREE_TYPE (srcmem))) |
807 | { | |
808 | new_stmt = gimple_build_assign (NULL_TREE, srcmem); | |
a15ebbcd ML |
809 | srcmem |
810 | = create_tmp_reg_or_ssa_name (TREE_TYPE (srcmem), | |
811 | new_stmt); | |
fef5a0d9 RB |
812 | gimple_assign_set_lhs (new_stmt, srcmem); |
813 | gimple_set_vuse (new_stmt, gimple_vuse (stmt)); | |
814 | gsi_insert_before (gsi, new_stmt, GSI_SAME_STMT); | |
815 | } | |
64ab8765 | 816 | if (dest_align < GET_MODE_ALIGNMENT (mode)) |
fef5a0d9 RB |
817 | desttype = build_aligned_type (type, dest_align); |
818 | new_stmt | |
819 | = gimple_build_assign (fold_build2 (MEM_REF, desttype, | |
820 | dest, off0), | |
821 | srcmem); | |
822 | gimple_set_vuse (new_stmt, gimple_vuse (stmt)); | |
823 | gimple_set_vdef (new_stmt, gimple_vdef (stmt)); | |
824 | if (gimple_vdef (new_stmt) | |
825 | && TREE_CODE (gimple_vdef (new_stmt)) == SSA_NAME) | |
826 | SSA_NAME_DEF_STMT (gimple_vdef (new_stmt)) = new_stmt; | |
827 | if (!lhs) | |
828 | { | |
f6b4dc28 | 829 | gsi_replace (gsi, new_stmt, false); |
fef5a0d9 RB |
830 | return true; |
831 | } | |
832 | gsi_insert_before (gsi, new_stmt, GSI_SAME_STMT); | |
833 | goto done; | |
834 | } | |
835 | } | |
836 | } | |
837 | } | |
838 | ||
839 | if (endp == 3) | |
840 | { | |
841 | /* Both DEST and SRC must be pointer types. | |
842 | ??? This is what old code did. Is the testing for pointer types | |
843 | really mandatory? | |
844 | ||
845 | If either SRC is readonly or length is 1, we can use memcpy. */ | |
846 | if (!dest_align || !src_align) | |
847 | return false; | |
848 | if (readonly_data_expr (src) | |
849 | || (tree_fits_uhwi_p (len) | |
850 | && (MIN (src_align, dest_align) / BITS_PER_UNIT | |
851 | >= tree_to_uhwi (len)))) | |
852 | { | |
853 | tree fn = builtin_decl_implicit (BUILT_IN_MEMCPY); | |
854 | if (!fn) | |
855 | return false; | |
856 | gimple_call_set_fndecl (stmt, fn); | |
857 | gimple_call_set_arg (stmt, 0, dest); | |
858 | gimple_call_set_arg (stmt, 1, src); | |
859 | fold_stmt (gsi); | |
860 | return true; | |
861 | } | |
862 | ||
863 | /* If *src and *dest can't overlap, optimize into memcpy as well. */ | |
864 | if (TREE_CODE (src) == ADDR_EXPR | |
865 | && TREE_CODE (dest) == ADDR_EXPR) | |
866 | { | |
867 | tree src_base, dest_base, fn; | |
a90c8804 RS |
868 | poly_int64 src_offset = 0, dest_offset = 0; |
869 | poly_uint64 maxsize; | |
fef5a0d9 RB |
870 | |
871 | srcvar = TREE_OPERAND (src, 0); | |
4fda19ef JJ |
872 | src_base = get_addr_base_and_unit_offset (srcvar, &src_offset); |
873 | if (src_base == NULL) | |
874 | src_base = srcvar; | |
fef5a0d9 | 875 | destvar = TREE_OPERAND (dest, 0); |
4fda19ef JJ |
876 | dest_base = get_addr_base_and_unit_offset (destvar, |
877 | &dest_offset); | |
878 | if (dest_base == NULL) | |
879 | dest_base = destvar; | |
a90c8804 | 880 | if (!poly_int_tree_p (len, &maxsize)) |
fef5a0d9 | 881 | maxsize = -1; |
fef5a0d9 RB |
882 | if (SSA_VAR_P (src_base) |
883 | && SSA_VAR_P (dest_base)) | |
884 | { | |
885 | if (operand_equal_p (src_base, dest_base, 0) | |
a90c8804 RS |
886 | && ranges_maybe_overlap_p (src_offset, maxsize, |
887 | dest_offset, maxsize)) | |
fef5a0d9 RB |
888 | return false; |
889 | } | |
890 | else if (TREE_CODE (src_base) == MEM_REF | |
891 | && TREE_CODE (dest_base) == MEM_REF) | |
892 | { | |
893 | if (! operand_equal_p (TREE_OPERAND (src_base, 0), | |
894 | TREE_OPERAND (dest_base, 0), 0)) | |
895 | return false; | |
a90c8804 RS |
896 | poly_offset_int full_src_offset |
897 | = mem_ref_offset (src_base) + src_offset; | |
898 | poly_offset_int full_dest_offset | |
899 | = mem_ref_offset (dest_base) + dest_offset; | |
900 | if (ranges_maybe_overlap_p (full_src_offset, maxsize, | |
901 | full_dest_offset, maxsize)) | |
fef5a0d9 RB |
902 | return false; |
903 | } | |
904 | else | |
905 | return false; | |
906 | ||
907 | fn = builtin_decl_implicit (BUILT_IN_MEMCPY); | |
908 | if (!fn) | |
909 | return false; | |
910 | gimple_call_set_fndecl (stmt, fn); | |
911 | gimple_call_set_arg (stmt, 0, dest); | |
912 | gimple_call_set_arg (stmt, 1, src); | |
913 | fold_stmt (gsi); | |
914 | return true; | |
915 | } | |
916 | ||
917 | /* If the destination and source do not alias optimize into | |
918 | memcpy as well. */ | |
919 | if ((is_gimple_min_invariant (dest) | |
920 | || TREE_CODE (dest) == SSA_NAME) | |
921 | && (is_gimple_min_invariant (src) | |
922 | || TREE_CODE (src) == SSA_NAME)) | |
923 | { | |
924 | ao_ref destr, srcr; | |
925 | ao_ref_init_from_ptr_and_size (&destr, dest, len); | |
926 | ao_ref_init_from_ptr_and_size (&srcr, src, len); | |
927 | if (!refs_may_alias_p_1 (&destr, &srcr, false)) | |
928 | { | |
929 | tree fn; | |
930 | fn = builtin_decl_implicit (BUILT_IN_MEMCPY); | |
931 | if (!fn) | |
932 | return false; | |
933 | gimple_call_set_fndecl (stmt, fn); | |
934 | gimple_call_set_arg (stmt, 0, dest); | |
935 | gimple_call_set_arg (stmt, 1, src); | |
936 | fold_stmt (gsi); | |
937 | return true; | |
938 | } | |
939 | } | |
940 | ||
941 | return false; | |
942 | } | |
943 | ||
944 | if (!tree_fits_shwi_p (len)) | |
945 | return false; | |
fef5a0d9 RB |
946 | if (!POINTER_TYPE_P (TREE_TYPE (src)) |
947 | || !POINTER_TYPE_P (TREE_TYPE (dest))) | |
948 | return false; | |
949 | /* In the following try to find a type that is most natural to be | |
950 | used for the memcpy source and destination and that allows | |
951 | the most optimization when memcpy is turned into a plain assignment | |
952 | using that type. In theory we could always use a char[len] type | |
953 | but that only gains us that the destination and source possibly | |
954 | no longer will have their address taken. */ | |
fef5a0d9 RB |
955 | srctype = TREE_TYPE (TREE_TYPE (src)); |
956 | if (TREE_CODE (srctype) == ARRAY_TYPE | |
957 | && !tree_int_cst_equal (TYPE_SIZE_UNIT (srctype), len)) | |
42f74245 | 958 | srctype = TREE_TYPE (srctype); |
fef5a0d9 RB |
959 | desttype = TREE_TYPE (TREE_TYPE (dest)); |
960 | if (TREE_CODE (desttype) == ARRAY_TYPE | |
961 | && !tree_int_cst_equal (TYPE_SIZE_UNIT (desttype), len)) | |
42f74245 | 962 | desttype = TREE_TYPE (desttype); |
fef5a0d9 RB |
963 | if (TREE_ADDRESSABLE (srctype) |
964 | || TREE_ADDRESSABLE (desttype)) | |
965 | return false; | |
966 | ||
967 | /* Make sure we are not copying using a floating-point mode or | |
968 | a type whose size possibly does not match its precision. */ | |
969 | if (FLOAT_MODE_P (TYPE_MODE (desttype)) | |
970 | || TREE_CODE (desttype) == BOOLEAN_TYPE | |
971 | || TREE_CODE (desttype) == ENUMERAL_TYPE) | |
972 | desttype = bitwise_type_for_mode (TYPE_MODE (desttype)); | |
973 | if (FLOAT_MODE_P (TYPE_MODE (srctype)) | |
974 | || TREE_CODE (srctype) == BOOLEAN_TYPE | |
975 | || TREE_CODE (srctype) == ENUMERAL_TYPE) | |
976 | srctype = bitwise_type_for_mode (TYPE_MODE (srctype)); | |
977 | if (!srctype) | |
978 | srctype = desttype; | |
979 | if (!desttype) | |
980 | desttype = srctype; | |
981 | if (!srctype) | |
982 | return false; | |
983 | ||
984 | src_align = get_pointer_alignment (src); | |
985 | dest_align = get_pointer_alignment (dest); | |
986 | if (dest_align < TYPE_ALIGN (desttype) | |
987 | || src_align < TYPE_ALIGN (srctype)) | |
988 | return false; | |
989 | ||
42f74245 RB |
990 | destvar = NULL_TREE; |
991 | if (TREE_CODE (dest) == ADDR_EXPR | |
992 | && var_decl_component_p (TREE_OPERAND (dest, 0)) | |
fef5a0d9 | 993 | && tree_int_cst_equal (TYPE_SIZE_UNIT (desttype), len)) |
42f74245 | 994 | destvar = fold_build2 (MEM_REF, desttype, dest, off0); |
fef5a0d9 | 995 | |
42f74245 RB |
996 | srcvar = NULL_TREE; |
997 | if (TREE_CODE (src) == ADDR_EXPR | |
998 | && var_decl_component_p (TREE_OPERAND (src, 0)) | |
fef5a0d9 RB |
999 | && tree_int_cst_equal (TYPE_SIZE_UNIT (srctype), len)) |
1000 | { | |
1001 | if (!destvar | |
1002 | || src_align >= TYPE_ALIGN (desttype)) | |
1003 | srcvar = fold_build2 (MEM_REF, destvar ? desttype : srctype, | |
42f74245 | 1004 | src, off0); |
fef5a0d9 RB |
1005 | else if (!STRICT_ALIGNMENT) |
1006 | { | |
1007 | srctype = build_aligned_type (TYPE_MAIN_VARIANT (desttype), | |
1008 | src_align); | |
42f74245 | 1009 | srcvar = fold_build2 (MEM_REF, srctype, src, off0); |
fef5a0d9 | 1010 | } |
fef5a0d9 | 1011 | } |
fef5a0d9 RB |
1012 | |
1013 | if (srcvar == NULL_TREE && destvar == NULL_TREE) | |
1014 | return false; | |
1015 | ||
1016 | if (srcvar == NULL_TREE) | |
1017 | { | |
fef5a0d9 RB |
1018 | if (src_align >= TYPE_ALIGN (desttype)) |
1019 | srcvar = fold_build2 (MEM_REF, desttype, src, off0); | |
1020 | else | |
1021 | { | |
1022 | if (STRICT_ALIGNMENT) | |
1023 | return false; | |
1024 | srctype = build_aligned_type (TYPE_MAIN_VARIANT (desttype), | |
1025 | src_align); | |
1026 | srcvar = fold_build2 (MEM_REF, srctype, src, off0); | |
1027 | } | |
1028 | } | |
1029 | else if (destvar == NULL_TREE) | |
1030 | { | |
fef5a0d9 RB |
1031 | if (dest_align >= TYPE_ALIGN (srctype)) |
1032 | destvar = fold_build2 (MEM_REF, srctype, dest, off0); | |
1033 | else | |
1034 | { | |
1035 | if (STRICT_ALIGNMENT) | |
1036 | return false; | |
1037 | desttype = build_aligned_type (TYPE_MAIN_VARIANT (srctype), | |
1038 | dest_align); | |
1039 | destvar = fold_build2 (MEM_REF, desttype, dest, off0); | |
1040 | } | |
1041 | } | |
1042 | ||
cc8bea0a MS |
1043 | /* Detect invalid bounds and overlapping copies and issue either |
1044 | -Warray-bounds or -Wrestrict. */ | |
1045 | if (!nowarn) | |
1046 | check_bounds_or_overlap (as_a <gcall *>(stmt), dest, src, len, len); | |
1047 | ||
355fe088 | 1048 | gimple *new_stmt; |
fef5a0d9 RB |
1049 | if (is_gimple_reg_type (TREE_TYPE (srcvar))) |
1050 | { | |
921b13d0 RB |
1051 | tree tem = fold_const_aggregate_ref (srcvar); |
1052 | if (tem) | |
1053 | srcvar = tem; | |
1054 | if (! is_gimple_min_invariant (srcvar)) | |
1055 | { | |
1056 | new_stmt = gimple_build_assign (NULL_TREE, srcvar); | |
a15ebbcd ML |
1057 | srcvar = create_tmp_reg_or_ssa_name (TREE_TYPE (srcvar), |
1058 | new_stmt); | |
921b13d0 RB |
1059 | gimple_assign_set_lhs (new_stmt, srcvar); |
1060 | gimple_set_vuse (new_stmt, gimple_vuse (stmt)); | |
1061 | gsi_insert_before (gsi, new_stmt, GSI_SAME_STMT); | |
1062 | } | |
d7257171 RB |
1063 | new_stmt = gimple_build_assign (destvar, srcvar); |
1064 | goto set_vop_and_replace; | |
fef5a0d9 | 1065 | } |
d7257171 RB |
1066 | |
1067 | /* We get an aggregate copy. Use an unsigned char[] type to | |
1068 | perform the copying to preserve padding and to avoid any issues | |
1069 | with TREE_ADDRESSABLE types or float modes behavior on copying. */ | |
1070 | desttype = build_array_type_nelts (unsigned_char_type_node, | |
1071 | tree_to_uhwi (len)); | |
1072 | srctype = desttype; | |
1073 | if (src_align > TYPE_ALIGN (srctype)) | |
1074 | srctype = build_aligned_type (srctype, src_align); | |
1075 | if (dest_align > TYPE_ALIGN (desttype)) | |
1076 | desttype = build_aligned_type (desttype, dest_align); | |
1077 | new_stmt | |
1078 | = gimple_build_assign (fold_build2 (MEM_REF, desttype, dest, off0), | |
1079 | fold_build2 (MEM_REF, srctype, src, off0)); | |
1080 | set_vop_and_replace: | |
fef5a0d9 RB |
1081 | gimple_set_vuse (new_stmt, gimple_vuse (stmt)); |
1082 | gimple_set_vdef (new_stmt, gimple_vdef (stmt)); | |
1083 | if (gimple_vdef (new_stmt) | |
1084 | && TREE_CODE (gimple_vdef (new_stmt)) == SSA_NAME) | |
1085 | SSA_NAME_DEF_STMT (gimple_vdef (new_stmt)) = new_stmt; | |
1086 | if (!lhs) | |
1087 | { | |
f6b4dc28 | 1088 | gsi_replace (gsi, new_stmt, false); |
fef5a0d9 RB |
1089 | return true; |
1090 | } | |
1091 | gsi_insert_before (gsi, new_stmt, GSI_SAME_STMT); | |
1092 | } | |
1093 | ||
1094 | done: | |
74e3c262 | 1095 | gimple_seq stmts = NULL; |
fef5a0d9 RB |
1096 | if (endp == 0 || endp == 3) |
1097 | len = NULL_TREE; | |
1098 | else if (endp == 2) | |
74e3c262 RB |
1099 | len = gimple_build (&stmts, loc, MINUS_EXPR, TREE_TYPE (len), len, |
1100 | ssize_int (1)); | |
fef5a0d9 | 1101 | if (endp == 2 || endp == 1) |
74e3c262 RB |
1102 | { |
1103 | len = gimple_convert_to_ptrofftype (&stmts, loc, len); | |
1104 | dest = gimple_build (&stmts, loc, POINTER_PLUS_EXPR, | |
1105 | TREE_TYPE (dest), dest, len); | |
1106 | } | |
fef5a0d9 | 1107 | |
74e3c262 | 1108 | gsi_insert_seq_before (gsi, stmts, GSI_SAME_STMT); |
355fe088 | 1109 | gimple *repl = gimple_build_assign (lhs, dest); |
f6b4dc28 | 1110 | gsi_replace (gsi, repl, false); |
fef5a0d9 RB |
1111 | return true; |
1112 | } | |
1113 | ||
b3d8d88e MS |
1114 | /* Transform a call to built-in bcmp(a, b, len) at *GSI into one |
1115 | to built-in memcmp (a, b, len). */ | |
1116 | ||
1117 | static bool | |
1118 | gimple_fold_builtin_bcmp (gimple_stmt_iterator *gsi) | |
1119 | { | |
1120 | tree fn = builtin_decl_implicit (BUILT_IN_MEMCMP); | |
1121 | ||
1122 | if (!fn) | |
1123 | return false; | |
1124 | ||
1125 | /* Transform bcmp (a, b, len) into memcmp (a, b, len). */ | |
1126 | ||
1127 | gimple *stmt = gsi_stmt (*gsi); | |
1128 | tree a = gimple_call_arg (stmt, 0); | |
1129 | tree b = gimple_call_arg (stmt, 1); | |
1130 | tree len = gimple_call_arg (stmt, 2); | |
1131 | ||
1132 | gimple *repl = gimple_build_call (fn, 3, a, b, len); | |
1133 | replace_call_with_call_and_fold (gsi, repl); | |
1134 | ||
1135 | return true; | |
1136 | } | |
1137 | ||
1138 | /* Transform a call to built-in bcopy (src, dest, len) at *GSI into one | |
1139 | to built-in memmove (dest, src, len). */ | |
1140 | ||
1141 | static bool | |
1142 | gimple_fold_builtin_bcopy (gimple_stmt_iterator *gsi) | |
1143 | { | |
1144 | tree fn = builtin_decl_implicit (BUILT_IN_MEMMOVE); | |
1145 | ||
1146 | if (!fn) | |
1147 | return false; | |
1148 | ||
1149 | /* bcopy has been removed from POSIX in Issue 7 but Issue 6 specifies | |
1150 | it's quivalent to memmove (not memcpy). Transform bcopy (src, dest, | |
1151 | len) into memmove (dest, src, len). */ | |
1152 | ||
1153 | gimple *stmt = gsi_stmt (*gsi); | |
1154 | tree src = gimple_call_arg (stmt, 0); | |
1155 | tree dest = gimple_call_arg (stmt, 1); | |
1156 | tree len = gimple_call_arg (stmt, 2); | |
1157 | ||
1158 | gimple *repl = gimple_build_call (fn, 3, dest, src, len); | |
1159 | gimple_call_set_fntype (as_a <gcall *> (stmt), TREE_TYPE (fn)); | |
1160 | replace_call_with_call_and_fold (gsi, repl); | |
1161 | ||
1162 | return true; | |
1163 | } | |
1164 | ||
1165 | /* Transform a call to built-in bzero (dest, len) at *GSI into one | |
1166 | to built-in memset (dest, 0, len). */ | |
1167 | ||
1168 | static bool | |
1169 | gimple_fold_builtin_bzero (gimple_stmt_iterator *gsi) | |
1170 | { | |
1171 | tree fn = builtin_decl_implicit (BUILT_IN_MEMSET); | |
1172 | ||
1173 | if (!fn) | |
1174 | return false; | |
1175 | ||
1176 | /* Transform bzero (dest, len) into memset (dest, 0, len). */ | |
1177 | ||
1178 | gimple *stmt = gsi_stmt (*gsi); | |
1179 | tree dest = gimple_call_arg (stmt, 0); | |
1180 | tree len = gimple_call_arg (stmt, 1); | |
1181 | ||
1182 | gimple_seq seq = NULL; | |
1183 | gimple *repl = gimple_build_call (fn, 3, dest, integer_zero_node, len); | |
1184 | gimple_seq_add_stmt_without_update (&seq, repl); | |
1185 | gsi_replace_with_seq_vops (gsi, seq); | |
1186 | fold_stmt (gsi); | |
1187 | ||
1188 | return true; | |
1189 | } | |
1190 | ||
fef5a0d9 RB |
1191 | /* Fold function call to builtin memset or bzero at *GSI setting the |
1192 | memory of size LEN to VAL. Return whether a simplification was made. */ | |
1193 | ||
1194 | static bool | |
1195 | gimple_fold_builtin_memset (gimple_stmt_iterator *gsi, tree c, tree len) | |
1196 | { | |
355fe088 | 1197 | gimple *stmt = gsi_stmt (*gsi); |
fef5a0d9 RB |
1198 | tree etype; |
1199 | unsigned HOST_WIDE_INT length, cval; | |
1200 | ||
1201 | /* If the LEN parameter is zero, return DEST. */ | |
1202 | if (integer_zerop (len)) | |
1203 | { | |
1204 | replace_call_with_value (gsi, gimple_call_arg (stmt, 0)); | |
1205 | return true; | |
1206 | } | |
1207 | ||
1208 | if (! tree_fits_uhwi_p (len)) | |
1209 | return false; | |
1210 | ||
1211 | if (TREE_CODE (c) != INTEGER_CST) | |
1212 | return false; | |
1213 | ||
1214 | tree dest = gimple_call_arg (stmt, 0); | |
1215 | tree var = dest; | |
1216 | if (TREE_CODE (var) != ADDR_EXPR) | |
1217 | return false; | |
1218 | ||
1219 | var = TREE_OPERAND (var, 0); | |
1220 | if (TREE_THIS_VOLATILE (var)) | |
1221 | return false; | |
1222 | ||
1223 | etype = TREE_TYPE (var); | |
1224 | if (TREE_CODE (etype) == ARRAY_TYPE) | |
1225 | etype = TREE_TYPE (etype); | |
1226 | ||
1227 | if (!INTEGRAL_TYPE_P (etype) | |
1228 | && !POINTER_TYPE_P (etype)) | |
1229 | return NULL_TREE; | |
1230 | ||
1231 | if (! var_decl_component_p (var)) | |
1232 | return NULL_TREE; | |
1233 | ||
1234 | length = tree_to_uhwi (len); | |
7a504f33 | 1235 | if (GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (etype)) != length |
fef5a0d9 RB |
1236 | || get_pointer_alignment (dest) / BITS_PER_UNIT < length) |
1237 | return NULL_TREE; | |
1238 | ||
1239 | if (length > HOST_BITS_PER_WIDE_INT / BITS_PER_UNIT) | |
1240 | return NULL_TREE; | |
1241 | ||
1242 | if (integer_zerop (c)) | |
1243 | cval = 0; | |
1244 | else | |
1245 | { | |
1246 | if (CHAR_BIT != 8 || BITS_PER_UNIT != 8 || HOST_BITS_PER_WIDE_INT > 64) | |
1247 | return NULL_TREE; | |
1248 | ||
1249 | cval = TREE_INT_CST_LOW (c); | |
1250 | cval &= 0xff; | |
1251 | cval |= cval << 8; | |
1252 | cval |= cval << 16; | |
1253 | cval |= (cval << 31) << 1; | |
1254 | } | |
1255 | ||
1256 | var = fold_build2 (MEM_REF, etype, dest, build_int_cst (ptr_type_node, 0)); | |
355fe088 | 1257 | gimple *store = gimple_build_assign (var, build_int_cst_type (etype, cval)); |
fef5a0d9 RB |
1258 | gimple_set_vuse (store, gimple_vuse (stmt)); |
1259 | tree vdef = gimple_vdef (stmt); | |
1260 | if (vdef && TREE_CODE (vdef) == SSA_NAME) | |
1261 | { | |
1262 | gimple_set_vdef (store, gimple_vdef (stmt)); | |
1263 | SSA_NAME_DEF_STMT (gimple_vdef (stmt)) = store; | |
1264 | } | |
1265 | gsi_insert_before (gsi, store, GSI_SAME_STMT); | |
1266 | if (gimple_call_lhs (stmt)) | |
1267 | { | |
355fe088 | 1268 | gimple *asgn = gimple_build_assign (gimple_call_lhs (stmt), dest); |
f6b4dc28 | 1269 | gsi_replace (gsi, asgn, false); |
fef5a0d9 RB |
1270 | } |
1271 | else | |
1272 | { | |
1273 | gimple_stmt_iterator gsi2 = *gsi; | |
1274 | gsi_prev (gsi); | |
1275 | gsi_remove (&gsi2, true); | |
1276 | } | |
1277 | ||
1278 | return true; | |
1279 | } | |
1280 | ||
1281 | ||
88d0c3f0 MS |
1282 | /* Obtain the minimum and maximum string length or minimum and maximum |
1283 | value of ARG in LENGTH[0] and LENGTH[1], respectively. | |
1284 | If ARG is an SSA name variable, follow its use-def chains. When | |
1285 | TYPE == 0, if LENGTH[1] is not equal to the length we determine or | |
1286 | if we are unable to determine the length or value, return False. | |
1287 | VISITED is a bitmap of visited variables. | |
1288 | TYPE is 0 if string length should be obtained, 1 for maximum string | |
1289 | length and 2 for maximum value ARG can have. | |
1290 | When FUZZY is set and the length of a string cannot be determined, | |
1291 | the function instead considers as the maximum possible length the | |
3f343040 MS |
1292 | size of a character array it may refer to. |
1293 | Set *FLEXP to true if the range of the string lengths has been | |
1294 | obtained from the upper bound of an array at the end of a struct. | |
1295 | Such an array may hold a string that's longer than its upper bound | |
1296 | due to it being used as a poor-man's flexible array member. */ | |
fef5a0d9 RB |
1297 | |
1298 | static bool | |
88d0c3f0 | 1299 | get_range_strlen (tree arg, tree length[2], bitmap *visited, int type, |
3f343040 | 1300 | bool fuzzy, bool *flexp) |
fef5a0d9 RB |
1301 | { |
1302 | tree var, val; | |
355fe088 | 1303 | gimple *def_stmt; |
fef5a0d9 | 1304 | |
88d0c3f0 MS |
1305 | /* The minimum and maximum length. The MAXLEN pointer stays unchanged |
1306 | but MINLEN may be cleared during the execution of the function. */ | |
1307 | tree *minlen = length; | |
1308 | tree *const maxlen = length + 1; | |
1309 | ||
fef5a0d9 RB |
1310 | if (TREE_CODE (arg) != SSA_NAME) |
1311 | { | |
1312 | /* We can end up with &(*iftmp_1)[0] here as well, so handle it. */ | |
1313 | if (TREE_CODE (arg) == ADDR_EXPR | |
1314 | && TREE_CODE (TREE_OPERAND (arg, 0)) == ARRAY_REF | |
1315 | && integer_zerop (TREE_OPERAND (TREE_OPERAND (arg, 0), 1))) | |
1316 | { | |
1317 | tree aop0 = TREE_OPERAND (TREE_OPERAND (arg, 0), 0); | |
1318 | if (TREE_CODE (aop0) == INDIRECT_REF | |
1319 | && TREE_CODE (TREE_OPERAND (aop0, 0)) == SSA_NAME) | |
88d0c3f0 | 1320 | return get_range_strlen (TREE_OPERAND (aop0, 0), |
3f343040 | 1321 | length, visited, type, fuzzy, flexp); |
fef5a0d9 RB |
1322 | } |
1323 | ||
1324 | if (type == 2) | |
1325 | { | |
1326 | val = arg; | |
1327 | if (TREE_CODE (val) != INTEGER_CST | |
1328 | || tree_int_cst_sgn (val) < 0) | |
1329 | return false; | |
1330 | } | |
1331 | else | |
1332 | val = c_strlen (arg, 1); | |
88d0c3f0 MS |
1333 | |
1334 | if (!val && fuzzy) | |
1335 | { | |
1336 | if (TREE_CODE (arg) == ADDR_EXPR) | |
1337 | return get_range_strlen (TREE_OPERAND (arg, 0), length, | |
3f343040 | 1338 | visited, type, fuzzy, flexp); |
88d0c3f0 MS |
1339 | |
1340 | if (TREE_CODE (arg) == COMPONENT_REF | |
1341 | && TREE_CODE (TREE_TYPE (TREE_OPERAND (arg, 1))) == ARRAY_TYPE) | |
1342 | { | |
1343 | /* Use the type of the member array to determine the upper | |
1344 | bound on the length of the array. This may be overly | |
1345 | optimistic if the array itself isn't NUL-terminated and | |
1346 | the caller relies on the subsequent member to contain | |
3f343040 MS |
1347 | the NUL. |
1348 | Set *FLEXP to true if the array whose bound is being | |
1349 | used is at the end of a struct. */ | |
c3e46927 | 1350 | if (array_at_struct_end_p (arg)) |
3f343040 MS |
1351 | *flexp = true; |
1352 | ||
88d0c3f0 MS |
1353 | arg = TREE_OPERAND (arg, 1); |
1354 | val = TYPE_SIZE_UNIT (TREE_TYPE (arg)); | |
1355 | if (!val || integer_zerop (val)) | |
1356 | return false; | |
1357 | val = fold_build2 (MINUS_EXPR, TREE_TYPE (val), val, | |
1358 | integer_one_node); | |
e495e31a MS |
1359 | /* Set the minimum size to zero since the string in |
1360 | the array could have zero length. */ | |
1361 | *minlen = ssize_int (0); | |
88d0c3f0 | 1362 | } |
2004617a QZ |
1363 | |
1364 | if (VAR_P (arg) | |
1365 | && TREE_CODE (TREE_TYPE (arg)) == ARRAY_TYPE) | |
1366 | { | |
1367 | val = TYPE_SIZE_UNIT (TREE_TYPE (arg)); | |
1368 | if (!val || TREE_CODE (val) != INTEGER_CST || integer_zerop (val)) | |
1369 | return false; | |
1370 | val = wide_int_to_tree (TREE_TYPE (val), | |
1371 | wi::sub(wi::to_wide (val), 1)); | |
1372 | /* Set the minimum size to zero since the string in | |
1373 | the array could have zero length. */ | |
1374 | *minlen = ssize_int (0); | |
1375 | } | |
88d0c3f0 MS |
1376 | } |
1377 | ||
fef5a0d9 RB |
1378 | if (!val) |
1379 | return false; | |
1380 | ||
88d0c3f0 MS |
1381 | if (minlen |
1382 | && (!*minlen | |
1383 | || (type > 0 | |
1384 | && TREE_CODE (*minlen) == INTEGER_CST | |
1385 | && TREE_CODE (val) == INTEGER_CST | |
1386 | && tree_int_cst_lt (val, *minlen)))) | |
1387 | *minlen = val; | |
1388 | ||
1389 | if (*maxlen) | |
fef5a0d9 RB |
1390 | { |
1391 | if (type > 0) | |
1392 | { | |
88d0c3f0 | 1393 | if (TREE_CODE (*maxlen) != INTEGER_CST |
fef5a0d9 RB |
1394 | || TREE_CODE (val) != INTEGER_CST) |
1395 | return false; | |
1396 | ||
88d0c3f0 MS |
1397 | if (tree_int_cst_lt (*maxlen, val)) |
1398 | *maxlen = val; | |
fef5a0d9 RB |
1399 | return true; |
1400 | } | |
88d0c3f0 | 1401 | else if (simple_cst_equal (val, *maxlen) != 1) |
fef5a0d9 RB |
1402 | return false; |
1403 | } | |
1404 | ||
88d0c3f0 | 1405 | *maxlen = val; |
fef5a0d9 RB |
1406 | return true; |
1407 | } | |
1408 | ||
1409 | /* If ARG is registered for SSA update we cannot look at its defining | |
1410 | statement. */ | |
1411 | if (name_registered_for_update_p (arg)) | |
1412 | return false; | |
1413 | ||
1414 | /* If we were already here, break the infinite cycle. */ | |
dcb7fae2 RB |
1415 | if (!*visited) |
1416 | *visited = BITMAP_ALLOC (NULL); | |
1417 | if (!bitmap_set_bit (*visited, SSA_NAME_VERSION (arg))) | |
fef5a0d9 RB |
1418 | return true; |
1419 | ||
1420 | var = arg; | |
1421 | def_stmt = SSA_NAME_DEF_STMT (var); | |
1422 | ||
1423 | switch (gimple_code (def_stmt)) | |
1424 | { | |
1425 | case GIMPLE_ASSIGN: | |
1426 | /* The RHS of the statement defining VAR must either have a | |
1427 | constant length or come from another SSA_NAME with a constant | |
1428 | length. */ | |
1429 | if (gimple_assign_single_p (def_stmt) | |
1430 | || gimple_assign_unary_nop_p (def_stmt)) | |
1431 | { | |
1432 | tree rhs = gimple_assign_rhs1 (def_stmt); | |
3f343040 | 1433 | return get_range_strlen (rhs, length, visited, type, fuzzy, flexp); |
fef5a0d9 RB |
1434 | } |
1435 | else if (gimple_assign_rhs_code (def_stmt) == COND_EXPR) | |
1436 | { | |
1437 | tree op2 = gimple_assign_rhs2 (def_stmt); | |
1438 | tree op3 = gimple_assign_rhs3 (def_stmt); | |
3f343040 MS |
1439 | return get_range_strlen (op2, length, visited, type, fuzzy, flexp) |
1440 | && get_range_strlen (op3, length, visited, type, fuzzy, flexp); | |
cc8bea0a | 1441 | } |
fef5a0d9 RB |
1442 | return false; |
1443 | ||
1444 | case GIMPLE_PHI: | |
1445 | { | |
1446 | /* All the arguments of the PHI node must have the same constant | |
1447 | length. */ | |
1448 | unsigned i; | |
1449 | ||
1450 | for (i = 0; i < gimple_phi_num_args (def_stmt); i++) | |
1451 | { | |
1452 | tree arg = gimple_phi_arg (def_stmt, i)->def; | |
1453 | ||
1454 | /* If this PHI has itself as an argument, we cannot | |
1455 | determine the string length of this argument. However, | |
1456 | if we can find a constant string length for the other | |
1457 | PHI args then we can still be sure that this is a | |
1458 | constant string length. So be optimistic and just | |
1459 | continue with the next argument. */ | |
1460 | if (arg == gimple_phi_result (def_stmt)) | |
1461 | continue; | |
1462 | ||
3f343040 | 1463 | if (!get_range_strlen (arg, length, visited, type, fuzzy, flexp)) |
88d0c3f0 MS |
1464 | { |
1465 | if (fuzzy) | |
1466 | *maxlen = build_all_ones_cst (size_type_node); | |
1467 | else | |
1468 | return false; | |
1469 | } | |
fef5a0d9 RB |
1470 | } |
1471 | } | |
1472 | return true; | |
1473 | ||
1474 | default: | |
1475 | return false; | |
1476 | } | |
1477 | } | |
1478 | ||
88d0c3f0 MS |
1479 | /* Determine the minimum and maximum value or string length that ARG |
1480 | refers to and store each in the first two elements of MINMAXLEN. | |
1481 | For expressions that point to strings of unknown lengths that are | |
1482 | character arrays, use the upper bound of the array as the maximum | |
1483 | length. For example, given an expression like 'x ? array : "xyz"' | |
1484 | and array declared as 'char array[8]', MINMAXLEN[0] will be set | |
1485 | to 3 and MINMAXLEN[1] to 7, the longest string that could be | |
1486 | stored in array. | |
3f343040 MS |
1487 | Return true if the range of the string lengths has been obtained |
1488 | from the upper bound of an array at the end of a struct. Such | |
1489 | an array may hold a string that's longer than its upper bound | |
1490 | due to it being used as a poor-man's flexible array member. */ | |
88d0c3f0 | 1491 | |
3f343040 MS |
1492 | bool |
1493 | get_range_strlen (tree arg, tree minmaxlen[2]) | |
88d0c3f0 MS |
1494 | { |
1495 | bitmap visited = NULL; | |
1496 | ||
1497 | minmaxlen[0] = NULL_TREE; | |
1498 | minmaxlen[1] = NULL_TREE; | |
1499 | ||
3f343040 MS |
1500 | bool flexarray = false; |
1501 | get_range_strlen (arg, minmaxlen, &visited, 1, true, &flexarray); | |
88d0c3f0 MS |
1502 | |
1503 | if (visited) | |
1504 | BITMAP_FREE (visited); | |
3f343040 MS |
1505 | |
1506 | return flexarray; | |
88d0c3f0 MS |
1507 | } |
1508 | ||
dcb7fae2 RB |
1509 | tree |
1510 | get_maxval_strlen (tree arg, int type) | |
1511 | { | |
1512 | bitmap visited = NULL; | |
88d0c3f0 | 1513 | tree len[2] = { NULL_TREE, NULL_TREE }; |
3f343040 MS |
1514 | |
1515 | bool dummy; | |
1516 | if (!get_range_strlen (arg, len, &visited, type, false, &dummy)) | |
88d0c3f0 | 1517 | len[1] = NULL_TREE; |
dcb7fae2 RB |
1518 | if (visited) |
1519 | BITMAP_FREE (visited); | |
1520 | ||
88d0c3f0 | 1521 | return len[1]; |
dcb7fae2 RB |
1522 | } |
1523 | ||
fef5a0d9 RB |
1524 | |
1525 | /* Fold function call to builtin strcpy with arguments DEST and SRC. | |
1526 | If LEN is not NULL, it represents the length of the string to be | |
1527 | copied. Return NULL_TREE if no simplification can be made. */ | |
1528 | ||
1529 | static bool | |
1530 | gimple_fold_builtin_strcpy (gimple_stmt_iterator *gsi, | |
dcb7fae2 | 1531 | tree dest, tree src) |
fef5a0d9 | 1532 | { |
cc8bea0a MS |
1533 | gimple *stmt = gsi_stmt (*gsi); |
1534 | location_t loc = gimple_location (stmt); | |
fef5a0d9 RB |
1535 | tree fn; |
1536 | ||
1537 | /* If SRC and DEST are the same (and not volatile), return DEST. */ | |
1538 | if (operand_equal_p (src, dest, 0)) | |
1539 | { | |
cc8bea0a MS |
1540 | tree func = gimple_call_fndecl (stmt); |
1541 | ||
1542 | warning_at (loc, OPT_Wrestrict, | |
1543 | "%qD source argument is the same as destination", | |
1544 | func); | |
1545 | ||
fef5a0d9 RB |
1546 | replace_call_with_value (gsi, dest); |
1547 | return true; | |
1548 | } | |
1549 | ||
1550 | if (optimize_function_for_size_p (cfun)) | |
1551 | return false; | |
1552 | ||
1553 | fn = builtin_decl_implicit (BUILT_IN_MEMCPY); | |
1554 | if (!fn) | |
1555 | return false; | |
1556 | ||
1579e1f8 | 1557 | tree len = get_maxval_strlen (src, 0); |
fef5a0d9 | 1558 | if (!len) |
dcb7fae2 | 1559 | return false; |
fef5a0d9 RB |
1560 | |
1561 | len = fold_convert_loc (loc, size_type_node, len); | |
1562 | len = size_binop_loc (loc, PLUS_EXPR, len, build_int_cst (size_type_node, 1)); | |
1563 | len = force_gimple_operand_gsi (gsi, len, true, | |
1564 | NULL_TREE, true, GSI_SAME_STMT); | |
355fe088 | 1565 | gimple *repl = gimple_build_call (fn, 3, dest, src, len); |
fef5a0d9 RB |
1566 | replace_call_with_call_and_fold (gsi, repl); |
1567 | return true; | |
1568 | } | |
1569 | ||
1570 | /* Fold function call to builtin strncpy with arguments DEST, SRC, and LEN. | |
1571 | If SLEN is not NULL, it represents the length of the source string. | |
1572 | Return NULL_TREE if no simplification can be made. */ | |
1573 | ||
1574 | static bool | |
dcb7fae2 RB |
1575 | gimple_fold_builtin_strncpy (gimple_stmt_iterator *gsi, |
1576 | tree dest, tree src, tree len) | |
fef5a0d9 | 1577 | { |
025d57f0 MS |
1578 | gimple *stmt = gsi_stmt (*gsi); |
1579 | location_t loc = gimple_location (stmt); | |
6a33d0ff | 1580 | bool nonstring = get_attr_nonstring_decl (dest) != NULL_TREE; |
fef5a0d9 RB |
1581 | |
1582 | /* If the LEN parameter is zero, return DEST. */ | |
1583 | if (integer_zerop (len)) | |
1584 | { | |
6a33d0ff MS |
1585 | /* Avoid warning if the destination refers to a an array/pointer |
1586 | decorate with attribute nonstring. */ | |
1587 | if (!nonstring) | |
1588 | { | |
1589 | tree fndecl = gimple_call_fndecl (stmt); | |
1590 | gcall *call = as_a <gcall *> (stmt); | |
1591 | ||
1592 | /* Warn about the lack of nul termination: the result is not | |
1593 | a (nul-terminated) string. */ | |
1594 | tree slen = get_maxval_strlen (src, 0); | |
1595 | if (slen && !integer_zerop (slen)) | |
1596 | warning_at (loc, OPT_Wstringop_truncation, | |
1597 | "%G%qD destination unchanged after copying no bytes " | |
1598 | "from a string of length %E", | |
1599 | call, fndecl, slen); | |
1600 | else | |
1601 | warning_at (loc, OPT_Wstringop_truncation, | |
1602 | "%G%qD destination unchanged after copying no bytes", | |
1603 | call, fndecl); | |
1604 | } | |
025d57f0 | 1605 | |
fef5a0d9 RB |
1606 | replace_call_with_value (gsi, dest); |
1607 | return true; | |
1608 | } | |
1609 | ||
1610 | /* We can't compare slen with len as constants below if len is not a | |
1611 | constant. */ | |
dcb7fae2 | 1612 | if (TREE_CODE (len) != INTEGER_CST) |
fef5a0d9 RB |
1613 | return false; |
1614 | ||
fef5a0d9 | 1615 | /* Now, we must be passed a constant src ptr parameter. */ |
1579e1f8 | 1616 | tree slen = get_maxval_strlen (src, 0); |
dcb7fae2 | 1617 | if (!slen || TREE_CODE (slen) != INTEGER_CST) |
fef5a0d9 RB |
1618 | return false; |
1619 | ||
025d57f0 MS |
1620 | /* The size of the source string including the terminating nul. */ |
1621 | tree ssize = size_binop_loc (loc, PLUS_EXPR, slen, ssize_int (1)); | |
fef5a0d9 RB |
1622 | |
1623 | /* We do not support simplification of this case, though we do | |
1624 | support it when expanding trees into RTL. */ | |
1625 | /* FIXME: generate a call to __builtin_memset. */ | |
025d57f0 | 1626 | if (tree_int_cst_lt (ssize, len)) |
fef5a0d9 RB |
1627 | return false; |
1628 | ||
6a33d0ff | 1629 | if (!nonstring) |
025d57f0 | 1630 | { |
6a33d0ff | 1631 | if (tree_int_cst_lt (len, slen)) |
025d57f0 | 1632 | { |
6a33d0ff MS |
1633 | tree fndecl = gimple_call_fndecl (stmt); |
1634 | gcall *call = as_a <gcall *> (stmt); | |
1635 | ||
1636 | warning_at (loc, OPT_Wstringop_truncation, | |
1637 | (tree_int_cst_equal (size_one_node, len) | |
1638 | ? G_("%G%qD output truncated copying %E byte " | |
1639 | "from a string of length %E") | |
1640 | : G_("%G%qD output truncated copying %E bytes " | |
1641 | "from a string of length %E")), | |
1642 | call, fndecl, len, slen); | |
1643 | } | |
1644 | else if (tree_int_cst_equal (len, slen)) | |
1645 | { | |
1646 | tree fndecl = gimple_call_fndecl (stmt); | |
1647 | gcall *call = as_a <gcall *> (stmt); | |
1648 | ||
1649 | warning_at (loc, OPT_Wstringop_truncation, | |
1650 | (tree_int_cst_equal (size_one_node, len) | |
1651 | ? G_("%G%qD output truncated before terminating nul " | |
1652 | "copying %E byte from a string of the same " | |
1653 | "length") | |
1654 | : G_("%G%qD output truncated before terminating nul " | |
1655 | "copying %E bytes from a string of the same " | |
1656 | "length")), | |
1657 | call, fndecl, len); | |
025d57f0 | 1658 | } |
025d57f0 MS |
1659 | } |
1660 | ||
fef5a0d9 | 1661 | /* OK transform into builtin memcpy. */ |
025d57f0 | 1662 | tree fn = builtin_decl_implicit (BUILT_IN_MEMCPY); |
fef5a0d9 RB |
1663 | if (!fn) |
1664 | return false; | |
1665 | ||
1666 | len = fold_convert_loc (loc, size_type_node, len); | |
1667 | len = force_gimple_operand_gsi (gsi, len, true, | |
1668 | NULL_TREE, true, GSI_SAME_STMT); | |
355fe088 | 1669 | gimple *repl = gimple_build_call (fn, 3, dest, src, len); |
fef5a0d9 | 1670 | replace_call_with_call_and_fold (gsi, repl); |
025d57f0 | 1671 | |
fef5a0d9 RB |
1672 | return true; |
1673 | } | |
1674 | ||
71dea1dd WD |
1675 | /* Fold function call to builtin strchr or strrchr. |
1676 | If both arguments are constant, evaluate and fold the result, | |
1677 | otherwise simplify str(r)chr (str, 0) into str + strlen (str). | |
912d9ec3 WD |
1678 | In general strlen is significantly faster than strchr |
1679 | due to being a simpler operation. */ | |
1680 | static bool | |
71dea1dd | 1681 | gimple_fold_builtin_strchr (gimple_stmt_iterator *gsi, bool is_strrchr) |
912d9ec3 WD |
1682 | { |
1683 | gimple *stmt = gsi_stmt (*gsi); | |
1684 | tree str = gimple_call_arg (stmt, 0); | |
1685 | tree c = gimple_call_arg (stmt, 1); | |
1686 | location_t loc = gimple_location (stmt); | |
71dea1dd WD |
1687 | const char *p; |
1688 | char ch; | |
912d9ec3 | 1689 | |
71dea1dd | 1690 | if (!gimple_call_lhs (stmt)) |
912d9ec3 WD |
1691 | return false; |
1692 | ||
71dea1dd WD |
1693 | if ((p = c_getstr (str)) && target_char_cst_p (c, &ch)) |
1694 | { | |
1695 | const char *p1 = is_strrchr ? strrchr (p, ch) : strchr (p, ch); | |
1696 | ||
1697 | if (p1 == NULL) | |
1698 | { | |
1699 | replace_call_with_value (gsi, integer_zero_node); | |
1700 | return true; | |
1701 | } | |
1702 | ||
1703 | tree len = build_int_cst (size_type_node, p1 - p); | |
1704 | gimple_seq stmts = NULL; | |
1705 | gimple *new_stmt = gimple_build_assign (gimple_call_lhs (stmt), | |
1706 | POINTER_PLUS_EXPR, str, len); | |
1707 | gimple_seq_add_stmt_without_update (&stmts, new_stmt); | |
1708 | gsi_replace_with_seq_vops (gsi, stmts); | |
1709 | return true; | |
1710 | } | |
1711 | ||
1712 | if (!integer_zerop (c)) | |
912d9ec3 WD |
1713 | return false; |
1714 | ||
71dea1dd | 1715 | /* Transform strrchr (s, 0) to strchr (s, 0) when optimizing for size. */ |
c8952930 | 1716 | if (is_strrchr && optimize_function_for_size_p (cfun)) |
71dea1dd WD |
1717 | { |
1718 | tree strchr_fn = builtin_decl_implicit (BUILT_IN_STRCHR); | |
1719 | ||
c8952930 | 1720 | if (strchr_fn) |
71dea1dd WD |
1721 | { |
1722 | gimple *repl = gimple_build_call (strchr_fn, 2, str, c); | |
1723 | replace_call_with_call_and_fold (gsi, repl); | |
1724 | return true; | |
1725 | } | |
1726 | ||
1727 | return false; | |
1728 | } | |
1729 | ||
912d9ec3 WD |
1730 | tree len; |
1731 | tree strlen_fn = builtin_decl_implicit (BUILT_IN_STRLEN); | |
1732 | ||
1733 | if (!strlen_fn) | |
1734 | return false; | |
1735 | ||
1736 | /* Create newstr = strlen (str). */ | |
1737 | gimple_seq stmts = NULL; | |
1738 | gimple *new_stmt = gimple_build_call (strlen_fn, 1, str); | |
1739 | gimple_set_location (new_stmt, loc); | |
a15ebbcd | 1740 | len = create_tmp_reg_or_ssa_name (size_type_node); |
912d9ec3 WD |
1741 | gimple_call_set_lhs (new_stmt, len); |
1742 | gimple_seq_add_stmt_without_update (&stmts, new_stmt); | |
1743 | ||
1744 | /* Create (str p+ strlen (str)). */ | |
1745 | new_stmt = gimple_build_assign (gimple_call_lhs (stmt), | |
1746 | POINTER_PLUS_EXPR, str, len); | |
1747 | gimple_seq_add_stmt_without_update (&stmts, new_stmt); | |
1748 | gsi_replace_with_seq_vops (gsi, stmts); | |
1749 | /* gsi now points at the assignment to the lhs, get a | |
1750 | stmt iterator to the strlen. | |
1751 | ??? We can't use gsi_for_stmt as that doesn't work when the | |
1752 | CFG isn't built yet. */ | |
1753 | gimple_stmt_iterator gsi2 = *gsi; | |
1754 | gsi_prev (&gsi2); | |
1755 | fold_stmt (&gsi2); | |
1756 | return true; | |
1757 | } | |
1758 | ||
c8952930 JJ |
1759 | /* Fold function call to builtin strstr. |
1760 | If both arguments are constant, evaluate and fold the result, | |
1761 | additionally fold strstr (x, "") into x and strstr (x, "c") | |
1762 | into strchr (x, 'c'). */ | |
1763 | static bool | |
1764 | gimple_fold_builtin_strstr (gimple_stmt_iterator *gsi) | |
1765 | { | |
1766 | gimple *stmt = gsi_stmt (*gsi); | |
1767 | tree haystack = gimple_call_arg (stmt, 0); | |
1768 | tree needle = gimple_call_arg (stmt, 1); | |
1769 | const char *p, *q; | |
1770 | ||
1771 | if (!gimple_call_lhs (stmt)) | |
1772 | return false; | |
1773 | ||
1774 | q = c_getstr (needle); | |
1775 | if (q == NULL) | |
1776 | return false; | |
1777 | ||
1778 | if ((p = c_getstr (haystack))) | |
1779 | { | |
1780 | const char *r = strstr (p, q); | |
1781 | ||
1782 | if (r == NULL) | |
1783 | { | |
1784 | replace_call_with_value (gsi, integer_zero_node); | |
1785 | return true; | |
1786 | } | |
1787 | ||
1788 | tree len = build_int_cst (size_type_node, r - p); | |
1789 | gimple_seq stmts = NULL; | |
1790 | gimple *new_stmt | |
1791 | = gimple_build_assign (gimple_call_lhs (stmt), POINTER_PLUS_EXPR, | |
1792 | haystack, len); | |
1793 | gimple_seq_add_stmt_without_update (&stmts, new_stmt); | |
1794 | gsi_replace_with_seq_vops (gsi, stmts); | |
1795 | return true; | |
1796 | } | |
1797 | ||
1798 | /* For strstr (x, "") return x. */ | |
1799 | if (q[0] == '\0') | |
1800 | { | |
1801 | replace_call_with_value (gsi, haystack); | |
1802 | return true; | |
1803 | } | |
1804 | ||
1805 | /* Transform strstr (x, "c") into strchr (x, 'c'). */ | |
1806 | if (q[1] == '\0') | |
1807 | { | |
1808 | tree strchr_fn = builtin_decl_implicit (BUILT_IN_STRCHR); | |
1809 | if (strchr_fn) | |
1810 | { | |
1811 | tree c = build_int_cst (integer_type_node, q[0]); | |
1812 | gimple *repl = gimple_build_call (strchr_fn, 2, haystack, c); | |
1813 | replace_call_with_call_and_fold (gsi, repl); | |
1814 | return true; | |
1815 | } | |
1816 | } | |
1817 | ||
1818 | return false; | |
1819 | } | |
1820 | ||
fef5a0d9 RB |
1821 | /* Simplify a call to the strcat builtin. DST and SRC are the arguments |
1822 | to the call. | |
1823 | ||
1824 | Return NULL_TREE if no simplification was possible, otherwise return the | |
1825 | simplified form of the call as a tree. | |
1826 | ||
1827 | The simplified form may be a constant or other expression which | |
1828 | computes the same value, but in a more efficient manner (including | |
1829 | calls to other builtin functions). | |
1830 | ||
1831 | The call may contain arguments which need to be evaluated, but | |
1832 | which are not useful to determine the result of the call. In | |
1833 | this case we return a chain of COMPOUND_EXPRs. The LHS of each | |
1834 | COMPOUND_EXPR will be an argument which must be evaluated. | |
1835 | COMPOUND_EXPRs are chained through their RHS. The RHS of the last | |
1836 | COMPOUND_EXPR in the chain will contain the tree for the simplified | |
1837 | form of the builtin function call. */ | |
1838 | ||
1839 | static bool | |
dcb7fae2 | 1840 | gimple_fold_builtin_strcat (gimple_stmt_iterator *gsi, tree dst, tree src) |
fef5a0d9 | 1841 | { |
355fe088 | 1842 | gimple *stmt = gsi_stmt (*gsi); |
dcb7fae2 | 1843 | location_t loc = gimple_location (stmt); |
fef5a0d9 RB |
1844 | |
1845 | const char *p = c_getstr (src); | |
1846 | ||
1847 | /* If the string length is zero, return the dst parameter. */ | |
1848 | if (p && *p == '\0') | |
1849 | { | |
1850 | replace_call_with_value (gsi, dst); | |
1851 | return true; | |
1852 | } | |
1853 | ||
1854 | if (!optimize_bb_for_speed_p (gimple_bb (stmt))) | |
1855 | return false; | |
1856 | ||
1857 | /* See if we can store by pieces into (dst + strlen(dst)). */ | |
1858 | tree newdst; | |
1859 | tree strlen_fn = builtin_decl_implicit (BUILT_IN_STRLEN); | |
1860 | tree memcpy_fn = builtin_decl_implicit (BUILT_IN_MEMCPY); | |
1861 | ||
1862 | if (!strlen_fn || !memcpy_fn) | |
1863 | return false; | |
1864 | ||
1865 | /* If the length of the source string isn't computable don't | |
1866 | split strcat into strlen and memcpy. */ | |
dcb7fae2 | 1867 | tree len = get_maxval_strlen (src, 0); |
fef5a0d9 | 1868 | if (! len) |
fef5a0d9 RB |
1869 | return false; |
1870 | ||
1871 | /* Create strlen (dst). */ | |
1872 | gimple_seq stmts = NULL, stmts2; | |
355fe088 | 1873 | gimple *repl = gimple_build_call (strlen_fn, 1, dst); |
fef5a0d9 | 1874 | gimple_set_location (repl, loc); |
a15ebbcd | 1875 | newdst = create_tmp_reg_or_ssa_name (size_type_node); |
fef5a0d9 RB |
1876 | gimple_call_set_lhs (repl, newdst); |
1877 | gimple_seq_add_stmt_without_update (&stmts, repl); | |
1878 | ||
1879 | /* Create (dst p+ strlen (dst)). */ | |
1880 | newdst = fold_build_pointer_plus_loc (loc, dst, newdst); | |
1881 | newdst = force_gimple_operand (newdst, &stmts2, true, NULL_TREE); | |
1882 | gimple_seq_add_seq_without_update (&stmts, stmts2); | |
1883 | ||
1884 | len = fold_convert_loc (loc, size_type_node, len); | |
1885 | len = size_binop_loc (loc, PLUS_EXPR, len, | |
1886 | build_int_cst (size_type_node, 1)); | |
1887 | len = force_gimple_operand (len, &stmts2, true, NULL_TREE); | |
1888 | gimple_seq_add_seq_without_update (&stmts, stmts2); | |
1889 | ||
1890 | repl = gimple_build_call (memcpy_fn, 3, newdst, src, len); | |
1891 | gimple_seq_add_stmt_without_update (&stmts, repl); | |
1892 | if (gimple_call_lhs (stmt)) | |
1893 | { | |
1894 | repl = gimple_build_assign (gimple_call_lhs (stmt), dst); | |
1895 | gimple_seq_add_stmt_without_update (&stmts, repl); | |
1896 | gsi_replace_with_seq_vops (gsi, stmts); | |
1897 | /* gsi now points at the assignment to the lhs, get a | |
1898 | stmt iterator to the memcpy call. | |
1899 | ??? We can't use gsi_for_stmt as that doesn't work when the | |
1900 | CFG isn't built yet. */ | |
1901 | gimple_stmt_iterator gsi2 = *gsi; | |
1902 | gsi_prev (&gsi2); | |
1903 | fold_stmt (&gsi2); | |
1904 | } | |
1905 | else | |
1906 | { | |
1907 | gsi_replace_with_seq_vops (gsi, stmts); | |
1908 | fold_stmt (gsi); | |
1909 | } | |
1910 | return true; | |
1911 | } | |
1912 | ||
07f1cf56 RB |
1913 | /* Fold a call to the __strcat_chk builtin FNDECL. DEST, SRC, and SIZE |
1914 | are the arguments to the call. */ | |
1915 | ||
1916 | static bool | |
1917 | gimple_fold_builtin_strcat_chk (gimple_stmt_iterator *gsi) | |
1918 | { | |
355fe088 | 1919 | gimple *stmt = gsi_stmt (*gsi); |
07f1cf56 RB |
1920 | tree dest = gimple_call_arg (stmt, 0); |
1921 | tree src = gimple_call_arg (stmt, 1); | |
1922 | tree size = gimple_call_arg (stmt, 2); | |
1923 | tree fn; | |
1924 | const char *p; | |
1925 | ||
1926 | ||
1927 | p = c_getstr (src); | |
1928 | /* If the SRC parameter is "", return DEST. */ | |
1929 | if (p && *p == '\0') | |
1930 | { | |
1931 | replace_call_with_value (gsi, dest); | |
1932 | return true; | |
1933 | } | |
1934 | ||
1935 | if (! tree_fits_uhwi_p (size) || ! integer_all_onesp (size)) | |
1936 | return false; | |
1937 | ||
1938 | /* If __builtin_strcat_chk is used, assume strcat is available. */ | |
1939 | fn = builtin_decl_explicit (BUILT_IN_STRCAT); | |
1940 | if (!fn) | |
1941 | return false; | |
1942 | ||
355fe088 | 1943 | gimple *repl = gimple_build_call (fn, 2, dest, src); |
07f1cf56 RB |
1944 | replace_call_with_call_and_fold (gsi, repl); |
1945 | return true; | |
1946 | } | |
1947 | ||
ad03a744 RB |
1948 | /* Simplify a call to the strncat builtin. */ |
1949 | ||
1950 | static bool | |
1951 | gimple_fold_builtin_strncat (gimple_stmt_iterator *gsi) | |
1952 | { | |
1953 | gcall *stmt = as_a <gcall *> (gsi_stmt (*gsi)); | |
1954 | tree dst = gimple_call_arg (stmt, 0); | |
1955 | tree src = gimple_call_arg (stmt, 1); | |
1956 | tree len = gimple_call_arg (stmt, 2); | |
1957 | ||
1958 | const char *p = c_getstr (src); | |
1959 | ||
1960 | /* If the requested length is zero, or the src parameter string | |
1961 | length is zero, return the dst parameter. */ | |
1962 | if (integer_zerop (len) || (p && *p == '\0')) | |
1963 | { | |
1964 | replace_call_with_value (gsi, dst); | |
1965 | return true; | |
1966 | } | |
1967 | ||
025d57f0 MS |
1968 | if (TREE_CODE (len) != INTEGER_CST || !p) |
1969 | return false; | |
1970 | ||
1971 | unsigned srclen = strlen (p); | |
1972 | ||
1973 | int cmpsrc = compare_tree_int (len, srclen); | |
1974 | ||
1975 | /* Return early if the requested len is less than the string length. | |
1976 | Warnings will be issued elsewhere later. */ | |
1977 | if (cmpsrc < 0) | |
1978 | return false; | |
1979 | ||
1980 | unsigned HOST_WIDE_INT dstsize; | |
1981 | ||
1982 | bool nowarn = gimple_no_warning_p (stmt); | |
1983 | ||
1984 | if (!nowarn && compute_builtin_object_size (dst, 1, &dstsize)) | |
ad03a744 | 1985 | { |
025d57f0 | 1986 | int cmpdst = compare_tree_int (len, dstsize); |
ad03a744 | 1987 | |
025d57f0 MS |
1988 | if (cmpdst >= 0) |
1989 | { | |
1990 | tree fndecl = gimple_call_fndecl (stmt); | |
1991 | ||
1992 | /* Strncat copies (at most) LEN bytes and always appends | |
1993 | the terminating NUL so the specified bound should never | |
1994 | be equal to (or greater than) the size of the destination. | |
1995 | If it is, the copy could overflow. */ | |
1996 | location_t loc = gimple_location (stmt); | |
1997 | nowarn = warning_at (loc, OPT_Wstringop_overflow_, | |
1998 | cmpdst == 0 | |
1999 | ? G_("%G%qD specified bound %E equals " | |
2000 | "destination size") | |
2001 | : G_("%G%qD specified bound %E exceeds " | |
2002 | "destination size %wu"), | |
2003 | stmt, fndecl, len, dstsize); | |
2004 | if (nowarn) | |
2005 | gimple_set_no_warning (stmt, true); | |
2006 | } | |
2007 | } | |
ad03a744 | 2008 | |
025d57f0 MS |
2009 | if (!nowarn && cmpsrc == 0) |
2010 | { | |
2011 | tree fndecl = gimple_call_fndecl (stmt); | |
2012 | ||
2013 | /* To avoid certain truncation the specified bound should also | |
2014 | not be equal to (or less than) the length of the source. */ | |
2015 | location_t loc = gimple_location (stmt); | |
2016 | if (warning_at (loc, OPT_Wstringop_overflow_, | |
2017 | "%G%qD specified bound %E equals source length", | |
2018 | stmt, fndecl, len)) | |
2019 | gimple_set_no_warning (stmt, true); | |
ad03a744 RB |
2020 | } |
2021 | ||
025d57f0 MS |
2022 | tree fn = builtin_decl_implicit (BUILT_IN_STRCAT); |
2023 | ||
2024 | /* If the replacement _DECL isn't initialized, don't do the | |
2025 | transformation. */ | |
2026 | if (!fn) | |
2027 | return false; | |
2028 | ||
2029 | /* Otherwise, emit a call to strcat. */ | |
2030 | gcall *repl = gimple_build_call (fn, 2, dst, src); | |
2031 | replace_call_with_call_and_fold (gsi, repl); | |
2032 | return true; | |
ad03a744 RB |
2033 | } |
2034 | ||
745583f9 RB |
2035 | /* Fold a call to the __strncat_chk builtin with arguments DEST, SRC, |
2036 | LEN, and SIZE. */ | |
2037 | ||
2038 | static bool | |
2039 | gimple_fold_builtin_strncat_chk (gimple_stmt_iterator *gsi) | |
2040 | { | |
355fe088 | 2041 | gimple *stmt = gsi_stmt (*gsi); |
745583f9 RB |
2042 | tree dest = gimple_call_arg (stmt, 0); |
2043 | tree src = gimple_call_arg (stmt, 1); | |
2044 | tree len = gimple_call_arg (stmt, 2); | |
2045 | tree size = gimple_call_arg (stmt, 3); | |
2046 | tree fn; | |
2047 | const char *p; | |
2048 | ||
2049 | p = c_getstr (src); | |
2050 | /* If the SRC parameter is "" or if LEN is 0, return DEST. */ | |
2051 | if ((p && *p == '\0') | |
2052 | || integer_zerop (len)) | |
2053 | { | |
2054 | replace_call_with_value (gsi, dest); | |
2055 | return true; | |
2056 | } | |
2057 | ||
2058 | if (! tree_fits_uhwi_p (size)) | |
2059 | return false; | |
2060 | ||
2061 | if (! integer_all_onesp (size)) | |
2062 | { | |
2063 | tree src_len = c_strlen (src, 1); | |
2064 | if (src_len | |
2065 | && tree_fits_uhwi_p (src_len) | |
2066 | && tree_fits_uhwi_p (len) | |
2067 | && ! tree_int_cst_lt (len, src_len)) | |
2068 | { | |
2069 | /* If LEN >= strlen (SRC), optimize into __strcat_chk. */ | |
2070 | fn = builtin_decl_explicit (BUILT_IN_STRCAT_CHK); | |
2071 | if (!fn) | |
2072 | return false; | |
2073 | ||
355fe088 | 2074 | gimple *repl = gimple_build_call (fn, 3, dest, src, size); |
745583f9 RB |
2075 | replace_call_with_call_and_fold (gsi, repl); |
2076 | return true; | |
2077 | } | |
2078 | return false; | |
2079 | } | |
2080 | ||
2081 | /* If __builtin_strncat_chk is used, assume strncat is available. */ | |
2082 | fn = builtin_decl_explicit (BUILT_IN_STRNCAT); | |
2083 | if (!fn) | |
2084 | return false; | |
2085 | ||
355fe088 | 2086 | gimple *repl = gimple_build_call (fn, 3, dest, src, len); |
745583f9 RB |
2087 | replace_call_with_call_and_fold (gsi, repl); |
2088 | return true; | |
2089 | } | |
2090 | ||
a918bfbf ML |
2091 | /* Build and append gimple statements to STMTS that would load a first |
2092 | character of a memory location identified by STR. LOC is location | |
2093 | of the statement. */ | |
2094 | ||
2095 | static tree | |
2096 | gimple_load_first_char (location_t loc, tree str, gimple_seq *stmts) | |
2097 | { | |
2098 | tree var; | |
2099 | ||
2100 | tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0); | |
2101 | tree cst_uchar_ptr_node | |
2102 | = build_pointer_type_for_mode (cst_uchar_node, ptr_mode, true); | |
2103 | tree off0 = build_int_cst (cst_uchar_ptr_node, 0); | |
2104 | ||
2105 | tree temp = fold_build2_loc (loc, MEM_REF, cst_uchar_node, str, off0); | |
2106 | gassign *stmt = gimple_build_assign (NULL_TREE, temp); | |
2107 | var = create_tmp_reg_or_ssa_name (cst_uchar_node, stmt); | |
2108 | ||
2109 | gimple_assign_set_lhs (stmt, var); | |
2110 | gimple_seq_add_stmt_without_update (stmts, stmt); | |
2111 | ||
2112 | return var; | |
2113 | } | |
2114 | ||
2115 | /* Fold a call to the str{n}{case}cmp builtin pointed by GSI iterator. | |
2116 | FCODE is the name of the builtin. */ | |
2117 | ||
2118 | static bool | |
2119 | gimple_fold_builtin_string_compare (gimple_stmt_iterator *gsi) | |
2120 | { | |
2121 | gimple *stmt = gsi_stmt (*gsi); | |
2122 | tree callee = gimple_call_fndecl (stmt); | |
2123 | enum built_in_function fcode = DECL_FUNCTION_CODE (callee); | |
2124 | ||
2125 | tree type = integer_type_node; | |
2126 | tree str1 = gimple_call_arg (stmt, 0); | |
2127 | tree str2 = gimple_call_arg (stmt, 1); | |
2128 | tree lhs = gimple_call_lhs (stmt); | |
2129 | HOST_WIDE_INT length = -1; | |
2130 | ||
2131 | /* Handle strncmp and strncasecmp functions. */ | |
2132 | if (gimple_call_num_args (stmt) == 3) | |
2133 | { | |
2134 | tree len = gimple_call_arg (stmt, 2); | |
2135 | if (tree_fits_uhwi_p (len)) | |
2136 | length = tree_to_uhwi (len); | |
2137 | } | |
2138 | ||
2139 | /* If the LEN parameter is zero, return zero. */ | |
2140 | if (length == 0) | |
2141 | { | |
2142 | replace_call_with_value (gsi, integer_zero_node); | |
2143 | return true; | |
2144 | } | |
2145 | ||
2146 | /* If ARG1 and ARG2 are the same (and not volatile), return zero. */ | |
2147 | if (operand_equal_p (str1, str2, 0)) | |
2148 | { | |
2149 | replace_call_with_value (gsi, integer_zero_node); | |
2150 | return true; | |
2151 | } | |
2152 | ||
2153 | const char *p1 = c_getstr (str1); | |
2154 | const char *p2 = c_getstr (str2); | |
2155 | ||
2156 | /* For known strings, return an immediate value. */ | |
2157 | if (p1 && p2) | |
2158 | { | |
2159 | int r = 0; | |
2160 | bool known_result = false; | |
2161 | ||
2162 | switch (fcode) | |
2163 | { | |
2164 | case BUILT_IN_STRCMP: | |
2165 | { | |
2166 | r = strcmp (p1, p2); | |
2167 | known_result = true; | |
2168 | break; | |
2169 | } | |
2170 | case BUILT_IN_STRNCMP: | |
2171 | { | |
2172 | if (length == -1) | |
2173 | break; | |
2174 | r = strncmp (p1, p2, length); | |
2175 | known_result = true; | |
2176 | break; | |
2177 | } | |
2178 | /* Only handleable situation is where the string are equal (result 0), | |
2179 | which is already handled by operand_equal_p case. */ | |
2180 | case BUILT_IN_STRCASECMP: | |
2181 | break; | |
2182 | case BUILT_IN_STRNCASECMP: | |
2183 | { | |
2184 | if (length == -1) | |
2185 | break; | |
2186 | r = strncmp (p1, p2, length); | |
2187 | if (r == 0) | |
2188 | known_result = true; | |
5de73c05 | 2189 | break; |
a918bfbf ML |
2190 | } |
2191 | default: | |
2192 | gcc_unreachable (); | |
2193 | } | |
2194 | ||
2195 | if (known_result) | |
2196 | { | |
2197 | replace_call_with_value (gsi, build_cmp_result (type, r)); | |
2198 | return true; | |
2199 | } | |
2200 | } | |
2201 | ||
2202 | bool nonzero_length = length >= 1 | |
2203 | || fcode == BUILT_IN_STRCMP | |
2204 | || fcode == BUILT_IN_STRCASECMP; | |
2205 | ||
2206 | location_t loc = gimple_location (stmt); | |
2207 | ||
2208 | /* If the second arg is "", return *(const unsigned char*)arg1. */ | |
2209 | if (p2 && *p2 == '\0' && nonzero_length) | |
2210 | { | |
2211 | gimple_seq stmts = NULL; | |
2212 | tree var = gimple_load_first_char (loc, str1, &stmts); | |
2213 | if (lhs) | |
2214 | { | |
2215 | stmt = gimple_build_assign (lhs, NOP_EXPR, var); | |
2216 | gimple_seq_add_stmt_without_update (&stmts, stmt); | |
2217 | } | |
2218 | ||
2219 | gsi_replace_with_seq_vops (gsi, stmts); | |
2220 | return true; | |
2221 | } | |
2222 | ||
2223 | /* If the first arg is "", return -*(const unsigned char*)arg2. */ | |
2224 | if (p1 && *p1 == '\0' && nonzero_length) | |
2225 | { | |
2226 | gimple_seq stmts = NULL; | |
2227 | tree var = gimple_load_first_char (loc, str2, &stmts); | |
2228 | ||
2229 | if (lhs) | |
2230 | { | |
2231 | tree c = create_tmp_reg_or_ssa_name (integer_type_node); | |
2232 | stmt = gimple_build_assign (c, NOP_EXPR, var); | |
2233 | gimple_seq_add_stmt_without_update (&stmts, stmt); | |
2234 | ||
2235 | stmt = gimple_build_assign (lhs, NEGATE_EXPR, c); | |
2236 | gimple_seq_add_stmt_without_update (&stmts, stmt); | |
2237 | } | |
2238 | ||
2239 | gsi_replace_with_seq_vops (gsi, stmts); | |
2240 | return true; | |
2241 | } | |
2242 | ||
2243 | /* If len parameter is one, return an expression corresponding to | |
2244 | (*(const unsigned char*)arg2 - *(const unsigned char*)arg1). */ | |
2245 | if (fcode == BUILT_IN_STRNCMP && length == 1) | |
2246 | { | |
2247 | gimple_seq stmts = NULL; | |
2248 | tree temp1 = gimple_load_first_char (loc, str1, &stmts); | |
2249 | tree temp2 = gimple_load_first_char (loc, str2, &stmts); | |
2250 | ||
2251 | if (lhs) | |
2252 | { | |
2253 | tree c1 = create_tmp_reg_or_ssa_name (integer_type_node); | |
2254 | gassign *convert1 = gimple_build_assign (c1, NOP_EXPR, temp1); | |
2255 | gimple_seq_add_stmt_without_update (&stmts, convert1); | |
2256 | ||
2257 | tree c2 = create_tmp_reg_or_ssa_name (integer_type_node); | |
2258 | gassign *convert2 = gimple_build_assign (c2, NOP_EXPR, temp2); | |
2259 | gimple_seq_add_stmt_without_update (&stmts, convert2); | |
2260 | ||
2261 | stmt = gimple_build_assign (lhs, MINUS_EXPR, c1, c2); | |
2262 | gimple_seq_add_stmt_without_update (&stmts, stmt); | |
2263 | } | |
2264 | ||
2265 | gsi_replace_with_seq_vops (gsi, stmts); | |
2266 | return true; | |
2267 | } | |
2268 | ||
caed5c92 QZ |
2269 | /* If length is larger than the length of one constant string, |
2270 | replace strncmp with corresponding strcmp */ | |
2271 | if (fcode == BUILT_IN_STRNCMP | |
2272 | && length > 0 | |
2273 | && ((p2 && (size_t) length > strlen (p2)) | |
2274 | || (p1 && (size_t) length > strlen (p1)))) | |
2275 | { | |
2276 | tree fn = builtin_decl_implicit (BUILT_IN_STRCMP); | |
2277 | if (!fn) | |
2278 | return false; | |
2279 | gimple *repl = gimple_build_call (fn, 2, str1, str2); | |
2280 | replace_call_with_call_and_fold (gsi, repl); | |
2281 | return true; | |
2282 | } | |
2283 | ||
a918bfbf ML |
2284 | return false; |
2285 | } | |
2286 | ||
488c6247 ML |
2287 | /* Fold a call to the memchr pointed by GSI iterator. */ |
2288 | ||
2289 | static bool | |
2290 | gimple_fold_builtin_memchr (gimple_stmt_iterator *gsi) | |
2291 | { | |
2292 | gimple *stmt = gsi_stmt (*gsi); | |
2293 | tree lhs = gimple_call_lhs (stmt); | |
2294 | tree arg1 = gimple_call_arg (stmt, 0); | |
2295 | tree arg2 = gimple_call_arg (stmt, 1); | |
2296 | tree len = gimple_call_arg (stmt, 2); | |
2297 | ||
2298 | /* If the LEN parameter is zero, return zero. */ | |
2299 | if (integer_zerop (len)) | |
2300 | { | |
2301 | replace_call_with_value (gsi, build_int_cst (ptr_type_node, 0)); | |
2302 | return true; | |
2303 | } | |
2304 | ||
2305 | char c; | |
2306 | if (TREE_CODE (arg2) != INTEGER_CST | |
2307 | || !tree_fits_uhwi_p (len) | |
2308 | || !target_char_cst_p (arg2, &c)) | |
2309 | return false; | |
2310 | ||
2311 | unsigned HOST_WIDE_INT length = tree_to_uhwi (len); | |
2312 | unsigned HOST_WIDE_INT string_length; | |
2313 | const char *p1 = c_getstr (arg1, &string_length); | |
2314 | ||
2315 | if (p1) | |
2316 | { | |
2317 | const char *r = (const char *)memchr (p1, c, MIN (length, string_length)); | |
2318 | if (r == NULL) | |
2319 | { | |
2320 | if (length <= string_length) | |
2321 | { | |
2322 | replace_call_with_value (gsi, build_int_cst (ptr_type_node, 0)); | |
2323 | return true; | |
2324 | } | |
2325 | } | |
2326 | else | |
2327 | { | |
2328 | unsigned HOST_WIDE_INT offset = r - p1; | |
2329 | gimple_seq stmts = NULL; | |
2330 | if (lhs != NULL_TREE) | |
2331 | { | |
2332 | tree offset_cst = build_int_cst (TREE_TYPE (len), offset); | |
2333 | gassign *stmt = gimple_build_assign (lhs, POINTER_PLUS_EXPR, | |
2334 | arg1, offset_cst); | |
2335 | gimple_seq_add_stmt_without_update (&stmts, stmt); | |
2336 | } | |
2337 | else | |
2338 | gimple_seq_add_stmt_without_update (&stmts, | |
2339 | gimple_build_nop ()); | |
2340 | ||
2341 | gsi_replace_with_seq_vops (gsi, stmts); | |
2342 | return true; | |
2343 | } | |
2344 | } | |
2345 | ||
2346 | return false; | |
2347 | } | |
a918bfbf | 2348 | |
fef5a0d9 RB |
2349 | /* Fold a call to the fputs builtin. ARG0 and ARG1 are the arguments |
2350 | to the call. IGNORE is true if the value returned | |
2351 | by the builtin will be ignored. UNLOCKED is true is true if this | |
2352 | actually a call to fputs_unlocked. If LEN in non-NULL, it represents | |
2353 | the known length of the string. Return NULL_TREE if no simplification | |
2354 | was possible. */ | |
2355 | ||
2356 | static bool | |
2357 | gimple_fold_builtin_fputs (gimple_stmt_iterator *gsi, | |
fef5a0d9 | 2358 | tree arg0, tree arg1, |
dcb7fae2 | 2359 | bool unlocked) |
fef5a0d9 | 2360 | { |
355fe088 | 2361 | gimple *stmt = gsi_stmt (*gsi); |
dcb7fae2 | 2362 | |
fef5a0d9 RB |
2363 | /* If we're using an unlocked function, assume the other unlocked |
2364 | functions exist explicitly. */ | |
2365 | tree const fn_fputc = (unlocked | |
2366 | ? builtin_decl_explicit (BUILT_IN_FPUTC_UNLOCKED) | |
2367 | : builtin_decl_implicit (BUILT_IN_FPUTC)); | |
2368 | tree const fn_fwrite = (unlocked | |
2369 | ? builtin_decl_explicit (BUILT_IN_FWRITE_UNLOCKED) | |
2370 | : builtin_decl_implicit (BUILT_IN_FWRITE)); | |
2371 | ||
2372 | /* If the return value is used, don't do the transformation. */ | |
dcb7fae2 | 2373 | if (gimple_call_lhs (stmt)) |
fef5a0d9 RB |
2374 | return false; |
2375 | ||
fef5a0d9 RB |
2376 | /* Get the length of the string passed to fputs. If the length |
2377 | can't be determined, punt. */ | |
dcb7fae2 | 2378 | tree len = get_maxval_strlen (arg0, 0); |
fef5a0d9 RB |
2379 | if (!len |
2380 | || TREE_CODE (len) != INTEGER_CST) | |
2381 | return false; | |
2382 | ||
2383 | switch (compare_tree_int (len, 1)) | |
2384 | { | |
2385 | case -1: /* length is 0, delete the call entirely . */ | |
2386 | replace_call_with_value (gsi, integer_zero_node); | |
2387 | return true; | |
2388 | ||
2389 | case 0: /* length is 1, call fputc. */ | |
2390 | { | |
2391 | const char *p = c_getstr (arg0); | |
2392 | if (p != NULL) | |
2393 | { | |
2394 | if (!fn_fputc) | |
2395 | return false; | |
2396 | ||
355fe088 | 2397 | gimple *repl = gimple_build_call (fn_fputc, 2, |
fef5a0d9 RB |
2398 | build_int_cst |
2399 | (integer_type_node, p[0]), arg1); | |
2400 | replace_call_with_call_and_fold (gsi, repl); | |
2401 | return true; | |
2402 | } | |
2403 | } | |
2404 | /* FALLTHROUGH */ | |
2405 | case 1: /* length is greater than 1, call fwrite. */ | |
2406 | { | |
2407 | /* If optimizing for size keep fputs. */ | |
2408 | if (optimize_function_for_size_p (cfun)) | |
2409 | return false; | |
2410 | /* New argument list transforming fputs(string, stream) to | |
2411 | fwrite(string, 1, len, stream). */ | |
2412 | if (!fn_fwrite) | |
2413 | return false; | |
2414 | ||
355fe088 | 2415 | gimple *repl = gimple_build_call (fn_fwrite, 4, arg0, |
fef5a0d9 RB |
2416 | size_one_node, len, arg1); |
2417 | replace_call_with_call_and_fold (gsi, repl); | |
2418 | return true; | |
2419 | } | |
2420 | default: | |
2421 | gcc_unreachable (); | |
2422 | } | |
2423 | return false; | |
2424 | } | |
2425 | ||
2426 | /* Fold a call to the __mem{cpy,pcpy,move,set}_chk builtin. | |
2427 | DEST, SRC, LEN, and SIZE are the arguments to the call. | |
2428 | IGNORE is true, if return value can be ignored. FCODE is the BUILT_IN_* | |
2429 | code of the builtin. If MAXLEN is not NULL, it is maximum length | |
2430 | passed as third argument. */ | |
2431 | ||
2432 | static bool | |
2433 | gimple_fold_builtin_memory_chk (gimple_stmt_iterator *gsi, | |
fef5a0d9 | 2434 | tree dest, tree src, tree len, tree size, |
fef5a0d9 RB |
2435 | enum built_in_function fcode) |
2436 | { | |
355fe088 | 2437 | gimple *stmt = gsi_stmt (*gsi); |
dcb7fae2 RB |
2438 | location_t loc = gimple_location (stmt); |
2439 | bool ignore = gimple_call_lhs (stmt) == NULL_TREE; | |
fef5a0d9 RB |
2440 | tree fn; |
2441 | ||
2442 | /* If SRC and DEST are the same (and not volatile), return DEST | |
2443 | (resp. DEST+LEN for __mempcpy_chk). */ | |
2444 | if (fcode != BUILT_IN_MEMSET_CHK && operand_equal_p (src, dest, 0)) | |
2445 | { | |
cc8bea0a MS |
2446 | if (fcode != BUILT_IN_MEMMOVE && fcode != BUILT_IN_MEMMOVE_CHK) |
2447 | { | |
2448 | tree func = gimple_call_fndecl (stmt); | |
2449 | ||
2450 | warning_at (loc, OPT_Wrestrict, | |
2451 | "%qD source argument is the same as destination", | |
2452 | func); | |
2453 | } | |
2454 | ||
fef5a0d9 RB |
2455 | if (fcode != BUILT_IN_MEMPCPY_CHK) |
2456 | { | |
2457 | replace_call_with_value (gsi, dest); | |
2458 | return true; | |
2459 | } | |
2460 | else | |
2461 | { | |
74e3c262 RB |
2462 | gimple_seq stmts = NULL; |
2463 | len = gimple_convert_to_ptrofftype (&stmts, loc, len); | |
22518428 JJ |
2464 | tree temp = gimple_build (&stmts, loc, POINTER_PLUS_EXPR, |
2465 | TREE_TYPE (dest), dest, len); | |
74e3c262 | 2466 | gsi_insert_seq_before (gsi, stmts, GSI_SAME_STMT); |
fef5a0d9 RB |
2467 | replace_call_with_value (gsi, temp); |
2468 | return true; | |
2469 | } | |
2470 | } | |
2471 | ||
2472 | if (! tree_fits_uhwi_p (size)) | |
2473 | return false; | |
2474 | ||
dcb7fae2 | 2475 | tree maxlen = get_maxval_strlen (len, 2); |
fef5a0d9 RB |
2476 | if (! integer_all_onesp (size)) |
2477 | { | |
2478 | if (! tree_fits_uhwi_p (len)) | |
2479 | { | |
2480 | /* If LEN is not constant, try MAXLEN too. | |
2481 | For MAXLEN only allow optimizing into non-_ocs function | |
2482 | if SIZE is >= MAXLEN, never convert to __ocs_fail (). */ | |
2483 | if (maxlen == NULL_TREE || ! tree_fits_uhwi_p (maxlen)) | |
2484 | { | |
2485 | if (fcode == BUILT_IN_MEMPCPY_CHK && ignore) | |
2486 | { | |
2487 | /* (void) __mempcpy_chk () can be optimized into | |
2488 | (void) __memcpy_chk (). */ | |
2489 | fn = builtin_decl_explicit (BUILT_IN_MEMCPY_CHK); | |
2490 | if (!fn) | |
2491 | return false; | |
2492 | ||
355fe088 | 2493 | gimple *repl = gimple_build_call (fn, 4, dest, src, len, size); |
fef5a0d9 RB |
2494 | replace_call_with_call_and_fold (gsi, repl); |
2495 | return true; | |
2496 | } | |
2497 | return false; | |
2498 | } | |
2499 | } | |
2500 | else | |
2501 | maxlen = len; | |
2502 | ||
2503 | if (tree_int_cst_lt (size, maxlen)) | |
2504 | return false; | |
2505 | } | |
2506 | ||
2507 | fn = NULL_TREE; | |
2508 | /* If __builtin_mem{cpy,pcpy,move,set}_chk is used, assume | |
2509 | mem{cpy,pcpy,move,set} is available. */ | |
2510 | switch (fcode) | |
2511 | { | |
2512 | case BUILT_IN_MEMCPY_CHK: | |
2513 | fn = builtin_decl_explicit (BUILT_IN_MEMCPY); | |
2514 | break; | |
2515 | case BUILT_IN_MEMPCPY_CHK: | |
2516 | fn = builtin_decl_explicit (BUILT_IN_MEMPCPY); | |
2517 | break; | |
2518 | case BUILT_IN_MEMMOVE_CHK: | |
2519 | fn = builtin_decl_explicit (BUILT_IN_MEMMOVE); | |
2520 | break; | |
2521 | case BUILT_IN_MEMSET_CHK: | |
2522 | fn = builtin_decl_explicit (BUILT_IN_MEMSET); | |
2523 | break; | |
2524 | default: | |
2525 | break; | |
2526 | } | |
2527 | ||
2528 | if (!fn) | |
2529 | return false; | |
2530 | ||
355fe088 | 2531 | gimple *repl = gimple_build_call (fn, 3, dest, src, len); |
fef5a0d9 RB |
2532 | replace_call_with_call_and_fold (gsi, repl); |
2533 | return true; | |
2534 | } | |
2535 | ||
2536 | /* Fold a call to the __st[rp]cpy_chk builtin. | |
2537 | DEST, SRC, and SIZE are the arguments to the call. | |
2538 | IGNORE is true if return value can be ignored. FCODE is the BUILT_IN_* | |
2539 | code of the builtin. If MAXLEN is not NULL, it is maximum length of | |
2540 | strings passed as second argument. */ | |
2541 | ||
2542 | static bool | |
2543 | gimple_fold_builtin_stxcpy_chk (gimple_stmt_iterator *gsi, | |
dcb7fae2 | 2544 | tree dest, |
fef5a0d9 | 2545 | tree src, tree size, |
fef5a0d9 RB |
2546 | enum built_in_function fcode) |
2547 | { | |
355fe088 | 2548 | gimple *stmt = gsi_stmt (*gsi); |
dcb7fae2 RB |
2549 | location_t loc = gimple_location (stmt); |
2550 | bool ignore = gimple_call_lhs (stmt) == NULL_TREE; | |
fef5a0d9 RB |
2551 | tree len, fn; |
2552 | ||
2553 | /* If SRC and DEST are the same (and not volatile), return DEST. */ | |
2554 | if (fcode == BUILT_IN_STRCPY_CHK && operand_equal_p (src, dest, 0)) | |
2555 | { | |
cc8bea0a MS |
2556 | tree func = gimple_call_fndecl (stmt); |
2557 | ||
2558 | warning_at (loc, OPT_Wrestrict, | |
2559 | "%qD source argument is the same as destination", | |
2560 | func); | |
2561 | ||
fef5a0d9 RB |
2562 | replace_call_with_value (gsi, dest); |
2563 | return true; | |
2564 | } | |
2565 | ||
2566 | if (! tree_fits_uhwi_p (size)) | |
2567 | return false; | |
2568 | ||
dcb7fae2 | 2569 | tree maxlen = get_maxval_strlen (src, 1); |
fef5a0d9 RB |
2570 | if (! integer_all_onesp (size)) |
2571 | { | |
2572 | len = c_strlen (src, 1); | |
2573 | if (! len || ! tree_fits_uhwi_p (len)) | |
2574 | { | |
2575 | /* If LEN is not constant, try MAXLEN too. | |
2576 | For MAXLEN only allow optimizing into non-_ocs function | |
2577 | if SIZE is >= MAXLEN, never convert to __ocs_fail (). */ | |
2578 | if (maxlen == NULL_TREE || ! tree_fits_uhwi_p (maxlen)) | |
2579 | { | |
2580 | if (fcode == BUILT_IN_STPCPY_CHK) | |
2581 | { | |
2582 | if (! ignore) | |
2583 | return false; | |
2584 | ||
2585 | /* If return value of __stpcpy_chk is ignored, | |
2586 | optimize into __strcpy_chk. */ | |
2587 | fn = builtin_decl_explicit (BUILT_IN_STRCPY_CHK); | |
2588 | if (!fn) | |
2589 | return false; | |
2590 | ||
355fe088 | 2591 | gimple *repl = gimple_build_call (fn, 3, dest, src, size); |
fef5a0d9 RB |
2592 | replace_call_with_call_and_fold (gsi, repl); |
2593 | return true; | |
2594 | } | |
2595 | ||
2596 | if (! len || TREE_SIDE_EFFECTS (len)) | |
2597 | return false; | |
2598 | ||
2599 | /* If c_strlen returned something, but not a constant, | |
2600 | transform __strcpy_chk into __memcpy_chk. */ | |
2601 | fn = builtin_decl_explicit (BUILT_IN_MEMCPY_CHK); | |
2602 | if (!fn) | |
2603 | return false; | |
2604 | ||
74e3c262 RB |
2605 | gimple_seq stmts = NULL; |
2606 | len = gimple_convert (&stmts, loc, size_type_node, len); | |
2607 | len = gimple_build (&stmts, loc, PLUS_EXPR, size_type_node, len, | |
2608 | build_int_cst (size_type_node, 1)); | |
2609 | gsi_insert_seq_before (gsi, stmts, GSI_SAME_STMT); | |
355fe088 | 2610 | gimple *repl = gimple_build_call (fn, 4, dest, src, len, size); |
fef5a0d9 RB |
2611 | replace_call_with_call_and_fold (gsi, repl); |
2612 | return true; | |
2613 | } | |
e256dfce | 2614 | } |
fef5a0d9 RB |
2615 | else |
2616 | maxlen = len; | |
2617 | ||
2618 | if (! tree_int_cst_lt (maxlen, size)) | |
2619 | return false; | |
e256dfce RG |
2620 | } |
2621 | ||
fef5a0d9 RB |
2622 | /* If __builtin_st{r,p}cpy_chk is used, assume st{r,p}cpy is available. */ |
2623 | fn = builtin_decl_explicit (fcode == BUILT_IN_STPCPY_CHK | |
2624 | ? BUILT_IN_STPCPY : BUILT_IN_STRCPY); | |
2625 | if (!fn) | |
2626 | return false; | |
2627 | ||
355fe088 | 2628 | gimple *repl = gimple_build_call (fn, 2, dest, src); |
fef5a0d9 RB |
2629 | replace_call_with_call_and_fold (gsi, repl); |
2630 | return true; | |
2631 | } | |
2632 | ||
2633 | /* Fold a call to the __st{r,p}ncpy_chk builtin. DEST, SRC, LEN, and SIZE | |
2634 | are the arguments to the call. If MAXLEN is not NULL, it is maximum | |
2635 | length passed as third argument. IGNORE is true if return value can be | |
2636 | ignored. FCODE is the BUILT_IN_* code of the builtin. */ | |
2637 | ||
2638 | static bool | |
2639 | gimple_fold_builtin_stxncpy_chk (gimple_stmt_iterator *gsi, | |
2640 | tree dest, tree src, | |
dcb7fae2 | 2641 | tree len, tree size, |
fef5a0d9 RB |
2642 | enum built_in_function fcode) |
2643 | { | |
355fe088 | 2644 | gimple *stmt = gsi_stmt (*gsi); |
dcb7fae2 | 2645 | bool ignore = gimple_call_lhs (stmt) == NULL_TREE; |
fef5a0d9 RB |
2646 | tree fn; |
2647 | ||
2648 | if (fcode == BUILT_IN_STPNCPY_CHK && ignore) | |
cbdd87d4 | 2649 | { |
fef5a0d9 RB |
2650 | /* If return value of __stpncpy_chk is ignored, |
2651 | optimize into __strncpy_chk. */ | |
2652 | fn = builtin_decl_explicit (BUILT_IN_STRNCPY_CHK); | |
2653 | if (fn) | |
2654 | { | |
355fe088 | 2655 | gimple *repl = gimple_build_call (fn, 4, dest, src, len, size); |
fef5a0d9 RB |
2656 | replace_call_with_call_and_fold (gsi, repl); |
2657 | return true; | |
2658 | } | |
cbdd87d4 RG |
2659 | } |
2660 | ||
fef5a0d9 RB |
2661 | if (! tree_fits_uhwi_p (size)) |
2662 | return false; | |
2663 | ||
dcb7fae2 | 2664 | tree maxlen = get_maxval_strlen (len, 2); |
fef5a0d9 | 2665 | if (! integer_all_onesp (size)) |
cbdd87d4 | 2666 | { |
fef5a0d9 | 2667 | if (! tree_fits_uhwi_p (len)) |
fe2ef088 | 2668 | { |
fef5a0d9 RB |
2669 | /* If LEN is not constant, try MAXLEN too. |
2670 | For MAXLEN only allow optimizing into non-_ocs function | |
2671 | if SIZE is >= MAXLEN, never convert to __ocs_fail (). */ | |
2672 | if (maxlen == NULL_TREE || ! tree_fits_uhwi_p (maxlen)) | |
2673 | return false; | |
8a1561bc | 2674 | } |
fef5a0d9 RB |
2675 | else |
2676 | maxlen = len; | |
2677 | ||
2678 | if (tree_int_cst_lt (size, maxlen)) | |
2679 | return false; | |
cbdd87d4 RG |
2680 | } |
2681 | ||
fef5a0d9 RB |
2682 | /* If __builtin_st{r,p}ncpy_chk is used, assume st{r,p}ncpy is available. */ |
2683 | fn = builtin_decl_explicit (fcode == BUILT_IN_STPNCPY_CHK | |
2684 | ? BUILT_IN_STPNCPY : BUILT_IN_STRNCPY); | |
2685 | if (!fn) | |
2686 | return false; | |
2687 | ||
355fe088 | 2688 | gimple *repl = gimple_build_call (fn, 3, dest, src, len); |
fef5a0d9 RB |
2689 | replace_call_with_call_and_fold (gsi, repl); |
2690 | return true; | |
cbdd87d4 RG |
2691 | } |
2692 | ||
2625bb5d RB |
2693 | /* Fold function call to builtin stpcpy with arguments DEST and SRC. |
2694 | Return NULL_TREE if no simplification can be made. */ | |
2695 | ||
2696 | static bool | |
2697 | gimple_fold_builtin_stpcpy (gimple_stmt_iterator *gsi) | |
2698 | { | |
2699 | gcall *stmt = as_a <gcall *> (gsi_stmt (*gsi)); | |
2700 | location_t loc = gimple_location (stmt); | |
2701 | tree dest = gimple_call_arg (stmt, 0); | |
2702 | tree src = gimple_call_arg (stmt, 1); | |
2703 | tree fn, len, lenp1; | |
2704 | ||
2705 | /* If the result is unused, replace stpcpy with strcpy. */ | |
2706 | if (gimple_call_lhs (stmt) == NULL_TREE) | |
2707 | { | |
2708 | tree fn = builtin_decl_implicit (BUILT_IN_STRCPY); | |
2709 | if (!fn) | |
2710 | return false; | |
2711 | gimple_call_set_fndecl (stmt, fn); | |
2712 | fold_stmt (gsi); | |
2713 | return true; | |
2714 | } | |
2715 | ||
2716 | len = c_strlen (src, 1); | |
2717 | if (!len | |
2718 | || TREE_CODE (len) != INTEGER_CST) | |
2719 | return false; | |
2720 | ||
2721 | if (optimize_function_for_size_p (cfun) | |
2722 | /* If length is zero it's small enough. */ | |
2723 | && !integer_zerop (len)) | |
2724 | return false; | |
2725 | ||
2726 | /* If the source has a known length replace stpcpy with memcpy. */ | |
2727 | fn = builtin_decl_implicit (BUILT_IN_MEMCPY); | |
2728 | if (!fn) | |
2729 | return false; | |
2730 | ||
2731 | gimple_seq stmts = NULL; | |
2732 | tree tem = gimple_convert (&stmts, loc, size_type_node, len); | |
2733 | lenp1 = gimple_build (&stmts, loc, PLUS_EXPR, size_type_node, | |
2734 | tem, build_int_cst (size_type_node, 1)); | |
2735 | gsi_insert_seq_before (gsi, stmts, GSI_SAME_STMT); | |
2736 | gcall *repl = gimple_build_call (fn, 3, dest, src, lenp1); | |
2737 | gimple_set_vuse (repl, gimple_vuse (stmt)); | |
2738 | gimple_set_vdef (repl, gimple_vdef (stmt)); | |
2739 | if (gimple_vdef (repl) | |
2740 | && TREE_CODE (gimple_vdef (repl)) == SSA_NAME) | |
2741 | SSA_NAME_DEF_STMT (gimple_vdef (repl)) = repl; | |
2742 | gsi_insert_before (gsi, repl, GSI_SAME_STMT); | |
2743 | /* Replace the result with dest + len. */ | |
2744 | stmts = NULL; | |
2745 | tem = gimple_convert (&stmts, loc, sizetype, len); | |
2746 | gsi_insert_seq_before (gsi, stmts, GSI_SAME_STMT); | |
2747 | gassign *ret = gimple_build_assign (gimple_call_lhs (stmt), | |
2748 | POINTER_PLUS_EXPR, dest, tem); | |
f6b4dc28 | 2749 | gsi_replace (gsi, ret, false); |
2625bb5d RB |
2750 | /* Finally fold the memcpy call. */ |
2751 | gimple_stmt_iterator gsi2 = *gsi; | |
2752 | gsi_prev (&gsi2); | |
2753 | fold_stmt (&gsi2); | |
2754 | return true; | |
2755 | } | |
2756 | ||
fef5a0d9 RB |
2757 | /* Fold a call EXP to {,v}snprintf having NARGS passed as ARGS. Return |
2758 | NULL_TREE if a normal call should be emitted rather than expanding | |
2759 | the function inline. FCODE is either BUILT_IN_SNPRINTF_CHK or | |
2760 | BUILT_IN_VSNPRINTF_CHK. If MAXLEN is not NULL, it is maximum length | |
2761 | passed as second argument. */ | |
cbdd87d4 RG |
2762 | |
2763 | static bool | |
fef5a0d9 | 2764 | gimple_fold_builtin_snprintf_chk (gimple_stmt_iterator *gsi, |
dcb7fae2 | 2765 | enum built_in_function fcode) |
cbdd87d4 | 2766 | { |
538dd0b7 | 2767 | gcall *stmt = as_a <gcall *> (gsi_stmt (*gsi)); |
fef5a0d9 RB |
2768 | tree dest, size, len, fn, fmt, flag; |
2769 | const char *fmt_str; | |
cbdd87d4 | 2770 | |
fef5a0d9 RB |
2771 | /* Verify the required arguments in the original call. */ |
2772 | if (gimple_call_num_args (stmt) < 5) | |
2773 | return false; | |
cbdd87d4 | 2774 | |
fef5a0d9 RB |
2775 | dest = gimple_call_arg (stmt, 0); |
2776 | len = gimple_call_arg (stmt, 1); | |
2777 | flag = gimple_call_arg (stmt, 2); | |
2778 | size = gimple_call_arg (stmt, 3); | |
2779 | fmt = gimple_call_arg (stmt, 4); | |
2780 | ||
2781 | if (! tree_fits_uhwi_p (size)) | |
2782 | return false; | |
2783 | ||
2784 | if (! integer_all_onesp (size)) | |
2785 | { | |
dcb7fae2 | 2786 | tree maxlen = get_maxval_strlen (len, 2); |
fef5a0d9 | 2787 | if (! tree_fits_uhwi_p (len)) |
cbdd87d4 | 2788 | { |
fef5a0d9 RB |
2789 | /* If LEN is not constant, try MAXLEN too. |
2790 | For MAXLEN only allow optimizing into non-_ocs function | |
2791 | if SIZE is >= MAXLEN, never convert to __ocs_fail (). */ | |
2792 | if (maxlen == NULL_TREE || ! tree_fits_uhwi_p (maxlen)) | |
cbdd87d4 RG |
2793 | return false; |
2794 | } | |
2795 | else | |
fef5a0d9 | 2796 | maxlen = len; |
cbdd87d4 | 2797 | |
fef5a0d9 RB |
2798 | if (tree_int_cst_lt (size, maxlen)) |
2799 | return false; | |
2800 | } | |
cbdd87d4 | 2801 | |
fef5a0d9 RB |
2802 | if (!init_target_chars ()) |
2803 | return false; | |
cbdd87d4 | 2804 | |
fef5a0d9 RB |
2805 | /* Only convert __{,v}snprintf_chk to {,v}snprintf if flag is 0 |
2806 | or if format doesn't contain % chars or is "%s". */ | |
2807 | if (! integer_zerop (flag)) | |
2808 | { | |
2809 | fmt_str = c_getstr (fmt); | |
2810 | if (fmt_str == NULL) | |
2811 | return false; | |
2812 | if (strchr (fmt_str, target_percent) != NULL | |
2813 | && strcmp (fmt_str, target_percent_s)) | |
2814 | return false; | |
cbdd87d4 RG |
2815 | } |
2816 | ||
fef5a0d9 RB |
2817 | /* If __builtin_{,v}snprintf_chk is used, assume {,v}snprintf is |
2818 | available. */ | |
2819 | fn = builtin_decl_explicit (fcode == BUILT_IN_VSNPRINTF_CHK | |
2820 | ? BUILT_IN_VSNPRINTF : BUILT_IN_SNPRINTF); | |
2821 | if (!fn) | |
491e0b9b RG |
2822 | return false; |
2823 | ||
fef5a0d9 RB |
2824 | /* Replace the called function and the first 5 argument by 3 retaining |
2825 | trailing varargs. */ | |
2826 | gimple_call_set_fndecl (stmt, fn); | |
2827 | gimple_call_set_fntype (stmt, TREE_TYPE (fn)); | |
2828 | gimple_call_set_arg (stmt, 0, dest); | |
2829 | gimple_call_set_arg (stmt, 1, len); | |
2830 | gimple_call_set_arg (stmt, 2, fmt); | |
2831 | for (unsigned i = 3; i < gimple_call_num_args (stmt) - 2; ++i) | |
2832 | gimple_call_set_arg (stmt, i, gimple_call_arg (stmt, i + 2)); | |
2833 | gimple_set_num_ops (stmt, gimple_num_ops (stmt) - 2); | |
2834 | fold_stmt (gsi); | |
2835 | return true; | |
2836 | } | |
cbdd87d4 | 2837 | |
fef5a0d9 RB |
2838 | /* Fold a call EXP to __{,v}sprintf_chk having NARGS passed as ARGS. |
2839 | Return NULL_TREE if a normal call should be emitted rather than | |
2840 | expanding the function inline. FCODE is either BUILT_IN_SPRINTF_CHK | |
2841 | or BUILT_IN_VSPRINTF_CHK. */ | |
cbdd87d4 | 2842 | |
fef5a0d9 RB |
2843 | static bool |
2844 | gimple_fold_builtin_sprintf_chk (gimple_stmt_iterator *gsi, | |
2845 | enum built_in_function fcode) | |
2846 | { | |
538dd0b7 | 2847 | gcall *stmt = as_a <gcall *> (gsi_stmt (*gsi)); |
fef5a0d9 RB |
2848 | tree dest, size, len, fn, fmt, flag; |
2849 | const char *fmt_str; | |
2850 | unsigned nargs = gimple_call_num_args (stmt); | |
cbdd87d4 | 2851 | |
fef5a0d9 RB |
2852 | /* Verify the required arguments in the original call. */ |
2853 | if (nargs < 4) | |
2854 | return false; | |
2855 | dest = gimple_call_arg (stmt, 0); | |
2856 | flag = gimple_call_arg (stmt, 1); | |
2857 | size = gimple_call_arg (stmt, 2); | |
2858 | fmt = gimple_call_arg (stmt, 3); | |
2859 | ||
2860 | if (! tree_fits_uhwi_p (size)) | |
2861 | return false; | |
2862 | ||
2863 | len = NULL_TREE; | |
2864 | ||
2865 | if (!init_target_chars ()) | |
2866 | return false; | |
2867 | ||
2868 | /* Check whether the format is a literal string constant. */ | |
2869 | fmt_str = c_getstr (fmt); | |
2870 | if (fmt_str != NULL) | |
2871 | { | |
2872 | /* If the format doesn't contain % args or %%, we know the size. */ | |
2873 | if (strchr (fmt_str, target_percent) == 0) | |
cbdd87d4 | 2874 | { |
fef5a0d9 RB |
2875 | if (fcode != BUILT_IN_SPRINTF_CHK || nargs == 4) |
2876 | len = build_int_cstu (size_type_node, strlen (fmt_str)); | |
2877 | } | |
2878 | /* If the format is "%s" and first ... argument is a string literal, | |
2879 | we know the size too. */ | |
2880 | else if (fcode == BUILT_IN_SPRINTF_CHK | |
2881 | && strcmp (fmt_str, target_percent_s) == 0) | |
2882 | { | |
2883 | tree arg; | |
cbdd87d4 | 2884 | |
fef5a0d9 RB |
2885 | if (nargs == 5) |
2886 | { | |
2887 | arg = gimple_call_arg (stmt, 4); | |
2888 | if (POINTER_TYPE_P (TREE_TYPE (arg))) | |
2889 | { | |
2890 | len = c_strlen (arg, 1); | |
2891 | if (! len || ! tree_fits_uhwi_p (len)) | |
2892 | len = NULL_TREE; | |
2893 | } | |
2894 | } | |
2895 | } | |
2896 | } | |
cbdd87d4 | 2897 | |
fef5a0d9 RB |
2898 | if (! integer_all_onesp (size)) |
2899 | { | |
2900 | if (! len || ! tree_int_cst_lt (len, size)) | |
2901 | return false; | |
2902 | } | |
cbdd87d4 | 2903 | |
fef5a0d9 RB |
2904 | /* Only convert __{,v}sprintf_chk to {,v}sprintf if flag is 0 |
2905 | or if format doesn't contain % chars or is "%s". */ | |
2906 | if (! integer_zerop (flag)) | |
2907 | { | |
2908 | if (fmt_str == NULL) | |
2909 | return false; | |
2910 | if (strchr (fmt_str, target_percent) != NULL | |
2911 | && strcmp (fmt_str, target_percent_s)) | |
2912 | return false; | |
2913 | } | |
cbdd87d4 | 2914 | |
fef5a0d9 RB |
2915 | /* If __builtin_{,v}sprintf_chk is used, assume {,v}sprintf is available. */ |
2916 | fn = builtin_decl_explicit (fcode == BUILT_IN_VSPRINTF_CHK | |
2917 | ? BUILT_IN_VSPRINTF : BUILT_IN_SPRINTF); | |
2918 | if (!fn) | |
2919 | return false; | |
2920 | ||
2921 | /* Replace the called function and the first 4 argument by 2 retaining | |
2922 | trailing varargs. */ | |
2923 | gimple_call_set_fndecl (stmt, fn); | |
2924 | gimple_call_set_fntype (stmt, TREE_TYPE (fn)); | |
2925 | gimple_call_set_arg (stmt, 0, dest); | |
2926 | gimple_call_set_arg (stmt, 1, fmt); | |
2927 | for (unsigned i = 2; i < gimple_call_num_args (stmt) - 2; ++i) | |
2928 | gimple_call_set_arg (stmt, i, gimple_call_arg (stmt, i + 2)); | |
2929 | gimple_set_num_ops (stmt, gimple_num_ops (stmt) - 2); | |
2930 | fold_stmt (gsi); | |
2931 | return true; | |
2932 | } | |
2933 | ||
35770bb2 RB |
2934 | /* Simplify a call to the sprintf builtin with arguments DEST, FMT, and ORIG. |
2935 | ORIG may be null if this is a 2-argument call. We don't attempt to | |
2936 | simplify calls with more than 3 arguments. | |
2937 | ||
a104bd88 | 2938 | Return true if simplification was possible, otherwise false. */ |
35770bb2 | 2939 | |
a104bd88 | 2940 | bool |
dcb7fae2 | 2941 | gimple_fold_builtin_sprintf (gimple_stmt_iterator *gsi) |
35770bb2 | 2942 | { |
355fe088 | 2943 | gimple *stmt = gsi_stmt (*gsi); |
35770bb2 RB |
2944 | tree dest = gimple_call_arg (stmt, 0); |
2945 | tree fmt = gimple_call_arg (stmt, 1); | |
2946 | tree orig = NULL_TREE; | |
2947 | const char *fmt_str = NULL; | |
2948 | ||
2949 | /* Verify the required arguments in the original call. We deal with two | |
2950 | types of sprintf() calls: 'sprintf (str, fmt)' and | |
2951 | 'sprintf (dest, "%s", orig)'. */ | |
2952 | if (gimple_call_num_args (stmt) > 3) | |
2953 | return false; | |
2954 | ||
2955 | if (gimple_call_num_args (stmt) == 3) | |
2956 | orig = gimple_call_arg (stmt, 2); | |
2957 | ||
2958 | /* Check whether the format is a literal string constant. */ | |
2959 | fmt_str = c_getstr (fmt); | |
2960 | if (fmt_str == NULL) | |
2961 | return false; | |
2962 | ||
2963 | if (!init_target_chars ()) | |
2964 | return false; | |
2965 | ||
2966 | /* If the format doesn't contain % args or %%, use strcpy. */ | |
2967 | if (strchr (fmt_str, target_percent) == NULL) | |
2968 | { | |
2969 | tree fn = builtin_decl_implicit (BUILT_IN_STRCPY); | |
2970 | ||
2971 | if (!fn) | |
2972 | return false; | |
2973 | ||
2974 | /* Don't optimize sprintf (buf, "abc", ptr++). */ | |
2975 | if (orig) | |
2976 | return false; | |
2977 | ||
2978 | /* Convert sprintf (str, fmt) into strcpy (str, fmt) when | |
2979 | 'format' is known to contain no % formats. */ | |
2980 | gimple_seq stmts = NULL; | |
355fe088 | 2981 | gimple *repl = gimple_build_call (fn, 2, dest, fmt); |
35770bb2 RB |
2982 | gimple_seq_add_stmt_without_update (&stmts, repl); |
2983 | if (gimple_call_lhs (stmt)) | |
2984 | { | |
2985 | repl = gimple_build_assign (gimple_call_lhs (stmt), | |
2986 | build_int_cst (integer_type_node, | |
2987 | strlen (fmt_str))); | |
2988 | gimple_seq_add_stmt_without_update (&stmts, repl); | |
2989 | gsi_replace_with_seq_vops (gsi, stmts); | |
2990 | /* gsi now points at the assignment to the lhs, get a | |
2991 | stmt iterator to the memcpy call. | |
2992 | ??? We can't use gsi_for_stmt as that doesn't work when the | |
2993 | CFG isn't built yet. */ | |
2994 | gimple_stmt_iterator gsi2 = *gsi; | |
2995 | gsi_prev (&gsi2); | |
2996 | fold_stmt (&gsi2); | |
2997 | } | |
2998 | else | |
2999 | { | |
3000 | gsi_replace_with_seq_vops (gsi, stmts); | |
3001 | fold_stmt (gsi); | |
3002 | } | |
3003 | return true; | |
3004 | } | |
3005 | ||
3006 | /* If the format is "%s", use strcpy if the result isn't used. */ | |
3007 | else if (fmt_str && strcmp (fmt_str, target_percent_s) == 0) | |
3008 | { | |
3009 | tree fn; | |
3010 | fn = builtin_decl_implicit (BUILT_IN_STRCPY); | |
3011 | ||
3012 | if (!fn) | |
3013 | return false; | |
3014 | ||
3015 | /* Don't crash on sprintf (str1, "%s"). */ | |
3016 | if (!orig) | |
3017 | return false; | |
3018 | ||
dcb7fae2 RB |
3019 | tree orig_len = NULL_TREE; |
3020 | if (gimple_call_lhs (stmt)) | |
35770bb2 | 3021 | { |
dcb7fae2 | 3022 | orig_len = get_maxval_strlen (orig, 0); |
d7e78447 | 3023 | if (!orig_len) |
35770bb2 RB |
3024 | return false; |
3025 | } | |
3026 | ||
3027 | /* Convert sprintf (str1, "%s", str2) into strcpy (str1, str2). */ | |
3028 | gimple_seq stmts = NULL; | |
355fe088 | 3029 | gimple *repl = gimple_build_call (fn, 2, dest, orig); |
35770bb2 RB |
3030 | gimple_seq_add_stmt_without_update (&stmts, repl); |
3031 | if (gimple_call_lhs (stmt)) | |
3032 | { | |
d7e78447 RB |
3033 | if (!useless_type_conversion_p (integer_type_node, |
3034 | TREE_TYPE (orig_len))) | |
3035 | orig_len = fold_convert (integer_type_node, orig_len); | |
3036 | repl = gimple_build_assign (gimple_call_lhs (stmt), orig_len); | |
35770bb2 RB |
3037 | gimple_seq_add_stmt_without_update (&stmts, repl); |
3038 | gsi_replace_with_seq_vops (gsi, stmts); | |
3039 | /* gsi now points at the assignment to the lhs, get a | |
3040 | stmt iterator to the memcpy call. | |
3041 | ??? We can't use gsi_for_stmt as that doesn't work when the | |
3042 | CFG isn't built yet. */ | |
3043 | gimple_stmt_iterator gsi2 = *gsi; | |
3044 | gsi_prev (&gsi2); | |
3045 | fold_stmt (&gsi2); | |
3046 | } | |
3047 | else | |
3048 | { | |
3049 | gsi_replace_with_seq_vops (gsi, stmts); | |
3050 | fold_stmt (gsi); | |
3051 | } | |
3052 | return true; | |
3053 | } | |
3054 | return false; | |
3055 | } | |
3056 | ||
d7e78447 RB |
3057 | /* Simplify a call to the snprintf builtin with arguments DEST, DESTSIZE, |
3058 | FMT, and ORIG. ORIG may be null if this is a 3-argument call. We don't | |
3059 | attempt to simplify calls with more than 4 arguments. | |
35770bb2 | 3060 | |
a104bd88 | 3061 | Return true if simplification was possible, otherwise false. */ |
d7e78447 | 3062 | |
a104bd88 | 3063 | bool |
dcb7fae2 | 3064 | gimple_fold_builtin_snprintf (gimple_stmt_iterator *gsi) |
d7e78447 | 3065 | { |
538dd0b7 | 3066 | gcall *stmt = as_a <gcall *> (gsi_stmt (*gsi)); |
d7e78447 RB |
3067 | tree dest = gimple_call_arg (stmt, 0); |
3068 | tree destsize = gimple_call_arg (stmt, 1); | |
3069 | tree fmt = gimple_call_arg (stmt, 2); | |
3070 | tree orig = NULL_TREE; | |
3071 | const char *fmt_str = NULL; | |
3072 | ||
3073 | if (gimple_call_num_args (stmt) > 4) | |
3074 | return false; | |
3075 | ||
3076 | if (gimple_call_num_args (stmt) == 4) | |
3077 | orig = gimple_call_arg (stmt, 3); | |
3078 | ||
3079 | if (!tree_fits_uhwi_p (destsize)) | |
3080 | return false; | |
3081 | unsigned HOST_WIDE_INT destlen = tree_to_uhwi (destsize); | |
3082 | ||
3083 | /* Check whether the format is a literal string constant. */ | |
3084 | fmt_str = c_getstr (fmt); | |
3085 | if (fmt_str == NULL) | |
3086 | return false; | |
3087 | ||
3088 | if (!init_target_chars ()) | |
3089 | return false; | |
3090 | ||
3091 | /* If the format doesn't contain % args or %%, use strcpy. */ | |
3092 | if (strchr (fmt_str, target_percent) == NULL) | |
3093 | { | |
3094 | tree fn = builtin_decl_implicit (BUILT_IN_STRCPY); | |
3095 | if (!fn) | |
3096 | return false; | |
3097 | ||
3098 | /* Don't optimize snprintf (buf, 4, "abc", ptr++). */ | |
3099 | if (orig) | |
3100 | return false; | |
3101 | ||
3102 | /* We could expand this as | |
3103 | memcpy (str, fmt, cst - 1); str[cst - 1] = '\0'; | |
3104 | or to | |
3105 | memcpy (str, fmt_with_nul_at_cstm1, cst); | |
3106 | but in the former case that might increase code size | |
3107 | and in the latter case grow .rodata section too much. | |
3108 | So punt for now. */ | |
3109 | size_t len = strlen (fmt_str); | |
3110 | if (len >= destlen) | |
3111 | return false; | |
3112 | ||
3113 | gimple_seq stmts = NULL; | |
355fe088 | 3114 | gimple *repl = gimple_build_call (fn, 2, dest, fmt); |
d7e78447 RB |
3115 | gimple_seq_add_stmt_without_update (&stmts, repl); |
3116 | if (gimple_call_lhs (stmt)) | |
3117 | { | |
3118 | repl = gimple_build_assign (gimple_call_lhs (stmt), | |
3119 | build_int_cst (integer_type_node, len)); | |
3120 | gimple_seq_add_stmt_without_update (&stmts, repl); | |
3121 | gsi_replace_with_seq_vops (gsi, stmts); | |
3122 | /* gsi now points at the assignment to the lhs, get a | |
3123 | stmt iterator to the memcpy call. | |
3124 | ??? We can't use gsi_for_stmt as that doesn't work when the | |
3125 | CFG isn't built yet. */ | |
3126 | gimple_stmt_iterator gsi2 = *gsi; | |
3127 | gsi_prev (&gsi2); | |
3128 | fold_stmt (&gsi2); | |
3129 | } | |
3130 | else | |
3131 | { | |
3132 | gsi_replace_with_seq_vops (gsi, stmts); | |
3133 | fold_stmt (gsi); | |
3134 | } | |
3135 | return true; | |
3136 | } | |
3137 | ||
3138 | /* If the format is "%s", use strcpy if the result isn't used. */ | |
3139 | else if (fmt_str && strcmp (fmt_str, target_percent_s) == 0) | |
3140 | { | |
3141 | tree fn = builtin_decl_implicit (BUILT_IN_STRCPY); | |
3142 | if (!fn) | |
3143 | return false; | |
3144 | ||
3145 | /* Don't crash on snprintf (str1, cst, "%s"). */ | |
3146 | if (!orig) | |
3147 | return false; | |
3148 | ||
dcb7fae2 | 3149 | tree orig_len = get_maxval_strlen (orig, 0); |
af9db3a7 | 3150 | if (!orig_len || TREE_CODE (orig_len) != INTEGER_CST) |
dcb7fae2 | 3151 | return false; |
d7e78447 RB |
3152 | |
3153 | /* We could expand this as | |
3154 | memcpy (str1, str2, cst - 1); str1[cst - 1] = '\0'; | |
3155 | or to | |
3156 | memcpy (str1, str2_with_nul_at_cstm1, cst); | |
3157 | but in the former case that might increase code size | |
3158 | and in the latter case grow .rodata section too much. | |
3159 | So punt for now. */ | |
3160 | if (compare_tree_int (orig_len, destlen) >= 0) | |
3161 | return false; | |
3162 | ||
3163 | /* Convert snprintf (str1, cst, "%s", str2) into | |
3164 | strcpy (str1, str2) if strlen (str2) < cst. */ | |
3165 | gimple_seq stmts = NULL; | |
355fe088 | 3166 | gimple *repl = gimple_build_call (fn, 2, dest, orig); |
d7e78447 RB |
3167 | gimple_seq_add_stmt_without_update (&stmts, repl); |
3168 | if (gimple_call_lhs (stmt)) | |
3169 | { | |
3170 | if (!useless_type_conversion_p (integer_type_node, | |
3171 | TREE_TYPE (orig_len))) | |
3172 | orig_len = fold_convert (integer_type_node, orig_len); | |
3173 | repl = gimple_build_assign (gimple_call_lhs (stmt), orig_len); | |
3174 | gimple_seq_add_stmt_without_update (&stmts, repl); | |
3175 | gsi_replace_with_seq_vops (gsi, stmts); | |
3176 | /* gsi now points at the assignment to the lhs, get a | |
3177 | stmt iterator to the memcpy call. | |
3178 | ??? We can't use gsi_for_stmt as that doesn't work when the | |
3179 | CFG isn't built yet. */ | |
3180 | gimple_stmt_iterator gsi2 = *gsi; | |
3181 | gsi_prev (&gsi2); | |
3182 | fold_stmt (&gsi2); | |
3183 | } | |
3184 | else | |
3185 | { | |
3186 | gsi_replace_with_seq_vops (gsi, stmts); | |
3187 | fold_stmt (gsi); | |
3188 | } | |
3189 | return true; | |
3190 | } | |
3191 | return false; | |
3192 | } | |
35770bb2 | 3193 | |
edd7ae68 RB |
3194 | /* Fold a call to the {,v}fprintf{,_unlocked} and __{,v}printf_chk builtins. |
3195 | FP, FMT, and ARG are the arguments to the call. We don't fold calls with | |
3196 | more than 3 arguments, and ARG may be null in the 2-argument case. | |
3197 | ||
3198 | Return NULL_TREE if no simplification was possible, otherwise return the | |
3199 | simplified form of the call as a tree. FCODE is the BUILT_IN_* | |
3200 | code of the function to be simplified. */ | |
3201 | ||
3202 | static bool | |
3203 | gimple_fold_builtin_fprintf (gimple_stmt_iterator *gsi, | |
3204 | tree fp, tree fmt, tree arg, | |
3205 | enum built_in_function fcode) | |
3206 | { | |
3207 | gcall *stmt = as_a <gcall *> (gsi_stmt (*gsi)); | |
3208 | tree fn_fputc, fn_fputs; | |
3209 | const char *fmt_str = NULL; | |
3210 | ||
3211 | /* If the return value is used, don't do the transformation. */ | |
3212 | if (gimple_call_lhs (stmt) != NULL_TREE) | |
3213 | return false; | |
3214 | ||
3215 | /* Check whether the format is a literal string constant. */ | |
3216 | fmt_str = c_getstr (fmt); | |
3217 | if (fmt_str == NULL) | |
3218 | return false; | |
3219 | ||
3220 | if (fcode == BUILT_IN_FPRINTF_UNLOCKED) | |
3221 | { | |
3222 | /* If we're using an unlocked function, assume the other | |
3223 | unlocked functions exist explicitly. */ | |
3224 | fn_fputc = builtin_decl_explicit (BUILT_IN_FPUTC_UNLOCKED); | |
3225 | fn_fputs = builtin_decl_explicit (BUILT_IN_FPUTS_UNLOCKED); | |
3226 | } | |
3227 | else | |
3228 | { | |
3229 | fn_fputc = builtin_decl_implicit (BUILT_IN_FPUTC); | |
3230 | fn_fputs = builtin_decl_implicit (BUILT_IN_FPUTS); | |
3231 | } | |
3232 | ||
3233 | if (!init_target_chars ()) | |
3234 | return false; | |
3235 | ||
3236 | /* If the format doesn't contain % args or %%, use strcpy. */ | |
3237 | if (strchr (fmt_str, target_percent) == NULL) | |
3238 | { | |
3239 | if (fcode != BUILT_IN_VFPRINTF && fcode != BUILT_IN_VFPRINTF_CHK | |
3240 | && arg) | |
3241 | return false; | |
3242 | ||
3243 | /* If the format specifier was "", fprintf does nothing. */ | |
3244 | if (fmt_str[0] == '\0') | |
3245 | { | |
3246 | replace_call_with_value (gsi, NULL_TREE); | |
3247 | return true; | |
3248 | } | |
3249 | ||
3250 | /* When "string" doesn't contain %, replace all cases of | |
3251 | fprintf (fp, string) with fputs (string, fp). The fputs | |
3252 | builtin will take care of special cases like length == 1. */ | |
3253 | if (fn_fputs) | |
3254 | { | |
3255 | gcall *repl = gimple_build_call (fn_fputs, 2, fmt, fp); | |
3256 | replace_call_with_call_and_fold (gsi, repl); | |
3257 | return true; | |
3258 | } | |
3259 | } | |
3260 | ||
3261 | /* The other optimizations can be done only on the non-va_list variants. */ | |
3262 | else if (fcode == BUILT_IN_VFPRINTF || fcode == BUILT_IN_VFPRINTF_CHK) | |
3263 | return false; | |
3264 | ||
3265 | /* If the format specifier was "%s", call __builtin_fputs (arg, fp). */ | |
3266 | else if (strcmp (fmt_str, target_percent_s) == 0) | |
3267 | { | |
3268 | if (!arg || ! POINTER_TYPE_P (TREE_TYPE (arg))) | |
3269 | return false; | |
3270 | if (fn_fputs) | |
3271 | { | |
3272 | gcall *repl = gimple_build_call (fn_fputs, 2, arg, fp); | |
3273 | replace_call_with_call_and_fold (gsi, repl); | |
3274 | return true; | |
3275 | } | |
3276 | } | |
3277 | ||
3278 | /* If the format specifier was "%c", call __builtin_fputc (arg, fp). */ | |
3279 | else if (strcmp (fmt_str, target_percent_c) == 0) | |
3280 | { | |
3281 | if (!arg | |
3282 | || ! useless_type_conversion_p (integer_type_node, TREE_TYPE (arg))) | |
3283 | return false; | |
3284 | if (fn_fputc) | |
3285 | { | |
3286 | gcall *repl = gimple_build_call (fn_fputc, 2, arg, fp); | |
3287 | replace_call_with_call_and_fold (gsi, repl); | |
3288 | return true; | |
3289 | } | |
3290 | } | |
3291 | ||
3292 | return false; | |
3293 | } | |
3294 | ||
ad03a744 RB |
3295 | /* Fold a call to the {,v}printf{,_unlocked} and __{,v}printf_chk builtins. |
3296 | FMT and ARG are the arguments to the call; we don't fold cases with | |
3297 | more than 2 arguments, and ARG may be null if this is a 1-argument case. | |
3298 | ||
3299 | Return NULL_TREE if no simplification was possible, otherwise return the | |
3300 | simplified form of the call as a tree. FCODE is the BUILT_IN_* | |
3301 | code of the function to be simplified. */ | |
3302 | ||
3303 | static bool | |
3304 | gimple_fold_builtin_printf (gimple_stmt_iterator *gsi, tree fmt, | |
3305 | tree arg, enum built_in_function fcode) | |
3306 | { | |
3307 | gcall *stmt = as_a <gcall *> (gsi_stmt (*gsi)); | |
3308 | tree fn_putchar, fn_puts, newarg; | |
3309 | const char *fmt_str = NULL; | |
3310 | ||
3311 | /* If the return value is used, don't do the transformation. */ | |
3312 | if (gimple_call_lhs (stmt) != NULL_TREE) | |
3313 | return false; | |
3314 | ||
3315 | /* Check whether the format is a literal string constant. */ | |
3316 | fmt_str = c_getstr (fmt); | |
3317 | if (fmt_str == NULL) | |
3318 | return false; | |
3319 | ||
3320 | if (fcode == BUILT_IN_PRINTF_UNLOCKED) | |
3321 | { | |
3322 | /* If we're using an unlocked function, assume the other | |
3323 | unlocked functions exist explicitly. */ | |
3324 | fn_putchar = builtin_decl_explicit (BUILT_IN_PUTCHAR_UNLOCKED); | |
3325 | fn_puts = builtin_decl_explicit (BUILT_IN_PUTS_UNLOCKED); | |
3326 | } | |
3327 | else | |
3328 | { | |
3329 | fn_putchar = builtin_decl_implicit (BUILT_IN_PUTCHAR); | |
3330 | fn_puts = builtin_decl_implicit (BUILT_IN_PUTS); | |
3331 | } | |
3332 | ||
3333 | if (!init_target_chars ()) | |
3334 | return false; | |
3335 | ||
3336 | if (strcmp (fmt_str, target_percent_s) == 0 | |
3337 | || strchr (fmt_str, target_percent) == NULL) | |
3338 | { | |
3339 | const char *str; | |
3340 | ||
3341 | if (strcmp (fmt_str, target_percent_s) == 0) | |
3342 | { | |
3343 | if (fcode == BUILT_IN_VPRINTF || fcode == BUILT_IN_VPRINTF_CHK) | |
3344 | return false; | |
3345 | ||
3346 | if (!arg || ! POINTER_TYPE_P (TREE_TYPE (arg))) | |
3347 | return false; | |
3348 | ||
3349 | str = c_getstr (arg); | |
3350 | if (str == NULL) | |
3351 | return false; | |
3352 | } | |
3353 | else | |
3354 | { | |
3355 | /* The format specifier doesn't contain any '%' characters. */ | |
3356 | if (fcode != BUILT_IN_VPRINTF && fcode != BUILT_IN_VPRINTF_CHK | |
3357 | && arg) | |
3358 | return false; | |
3359 | str = fmt_str; | |
3360 | } | |
3361 | ||
3362 | /* If the string was "", printf does nothing. */ | |
3363 | if (str[0] == '\0') | |
3364 | { | |
3365 | replace_call_with_value (gsi, NULL_TREE); | |
3366 | return true; | |
3367 | } | |
3368 | ||
3369 | /* If the string has length of 1, call putchar. */ | |
3370 | if (str[1] == '\0') | |
3371 | { | |
3372 | /* Given printf("c"), (where c is any one character,) | |
3373 | convert "c"[0] to an int and pass that to the replacement | |
3374 | function. */ | |
3375 | newarg = build_int_cst (integer_type_node, str[0]); | |
3376 | if (fn_putchar) | |
3377 | { | |
3378 | gcall *repl = gimple_build_call (fn_putchar, 1, newarg); | |
3379 | replace_call_with_call_and_fold (gsi, repl); | |
3380 | return true; | |
3381 | } | |
3382 | } | |
3383 | else | |
3384 | { | |
3385 | /* If the string was "string\n", call puts("string"). */ | |
3386 | size_t len = strlen (str); | |
3387 | if ((unsigned char)str[len - 1] == target_newline | |
3388 | && (size_t) (int) len == len | |
3389 | && (int) len > 0) | |
3390 | { | |
3391 | char *newstr; | |
3392 | tree offset_node, string_cst; | |
3393 | ||
3394 | /* Create a NUL-terminated string that's one char shorter | |
3395 | than the original, stripping off the trailing '\n'. */ | |
3396 | newarg = build_string_literal (len, str); | |
3397 | string_cst = string_constant (newarg, &offset_node); | |
3398 | gcc_checking_assert (string_cst | |
3399 | && (TREE_STRING_LENGTH (string_cst) | |
3400 | == (int) len) | |
3401 | && integer_zerop (offset_node) | |
3402 | && (unsigned char) | |
3403 | TREE_STRING_POINTER (string_cst)[len - 1] | |
3404 | == target_newline); | |
3405 | /* build_string_literal creates a new STRING_CST, | |
3406 | modify it in place to avoid double copying. */ | |
3407 | newstr = CONST_CAST (char *, TREE_STRING_POINTER (string_cst)); | |
3408 | newstr[len - 1] = '\0'; | |
3409 | if (fn_puts) | |
3410 | { | |
3411 | gcall *repl = gimple_build_call (fn_puts, 1, newarg); | |
3412 | replace_call_with_call_and_fold (gsi, repl); | |
3413 | return true; | |
3414 | } | |
3415 | } | |
3416 | else | |
3417 | /* We'd like to arrange to call fputs(string,stdout) here, | |
3418 | but we need stdout and don't have a way to get it yet. */ | |
3419 | return false; | |
3420 | } | |
3421 | } | |
3422 | ||
3423 | /* The other optimizations can be done only on the non-va_list variants. */ | |
3424 | else if (fcode == BUILT_IN_VPRINTF || fcode == BUILT_IN_VPRINTF_CHK) | |
3425 | return false; | |
3426 | ||
3427 | /* If the format specifier was "%s\n", call __builtin_puts(arg). */ | |
3428 | else if (strcmp (fmt_str, target_percent_s_newline) == 0) | |
3429 | { | |
3430 | if (!arg || ! POINTER_TYPE_P (TREE_TYPE (arg))) | |
3431 | return false; | |
3432 | if (fn_puts) | |
3433 | { | |
3434 | gcall *repl = gimple_build_call (fn_puts, 1, arg); | |
3435 | replace_call_with_call_and_fold (gsi, repl); | |
3436 | return true; | |
3437 | } | |
3438 | } | |
3439 | ||
3440 | /* If the format specifier was "%c", call __builtin_putchar(arg). */ | |
3441 | else if (strcmp (fmt_str, target_percent_c) == 0) | |
3442 | { | |
3443 | if (!arg || ! useless_type_conversion_p (integer_type_node, | |
3444 | TREE_TYPE (arg))) | |
3445 | return false; | |
3446 | if (fn_putchar) | |
3447 | { | |
3448 | gcall *repl = gimple_build_call (fn_putchar, 1, arg); | |
3449 | replace_call_with_call_and_fold (gsi, repl); | |
3450 | return true; | |
3451 | } | |
3452 | } | |
3453 | ||
3454 | return false; | |
3455 | } | |
3456 | ||
edd7ae68 | 3457 | |
fef5a0d9 RB |
3458 | |
3459 | /* Fold a call to __builtin_strlen with known length LEN. */ | |
3460 | ||
3461 | static bool | |
dcb7fae2 | 3462 | gimple_fold_builtin_strlen (gimple_stmt_iterator *gsi) |
fef5a0d9 | 3463 | { |
355fe088 | 3464 | gimple *stmt = gsi_stmt (*gsi); |
dcb7fae2 | 3465 | tree len = get_maxval_strlen (gimple_call_arg (stmt, 0), 0); |
fef5a0d9 RB |
3466 | if (!len) |
3467 | return false; | |
2813904b | 3468 | len = force_gimple_operand_gsi (gsi, len, true, NULL, true, GSI_SAME_STMT); |
fef5a0d9 RB |
3469 | replace_call_with_value (gsi, len); |
3470 | return true; | |
cbdd87d4 RG |
3471 | } |
3472 | ||
48126138 NS |
3473 | /* Fold a call to __builtin_acc_on_device. */ |
3474 | ||
3475 | static bool | |
3476 | gimple_fold_builtin_acc_on_device (gimple_stmt_iterator *gsi, tree arg0) | |
3477 | { | |
3478 | /* Defer folding until we know which compiler we're in. */ | |
3479 | if (symtab->state != EXPANSION) | |
3480 | return false; | |
3481 | ||
3482 | unsigned val_host = GOMP_DEVICE_HOST; | |
3483 | unsigned val_dev = GOMP_DEVICE_NONE; | |
3484 | ||
3485 | #ifdef ACCEL_COMPILER | |
3486 | val_host = GOMP_DEVICE_NOT_HOST; | |
3487 | val_dev = ACCEL_COMPILER_acc_device; | |
3488 | #endif | |
3489 | ||
3490 | location_t loc = gimple_location (gsi_stmt (*gsi)); | |
3491 | ||
3492 | tree host_eq = make_ssa_name (boolean_type_node); | |
3493 | gimple *host_ass = gimple_build_assign | |
3494 | (host_eq, EQ_EXPR, arg0, build_int_cst (TREE_TYPE (arg0), val_host)); | |
3495 | gimple_set_location (host_ass, loc); | |
3496 | gsi_insert_before (gsi, host_ass, GSI_SAME_STMT); | |
3497 | ||
3498 | tree dev_eq = make_ssa_name (boolean_type_node); | |
3499 | gimple *dev_ass = gimple_build_assign | |
3500 | (dev_eq, EQ_EXPR, arg0, build_int_cst (TREE_TYPE (arg0), val_dev)); | |
3501 | gimple_set_location (dev_ass, loc); | |
3502 | gsi_insert_before (gsi, dev_ass, GSI_SAME_STMT); | |
3503 | ||
3504 | tree result = make_ssa_name (boolean_type_node); | |
3505 | gimple *result_ass = gimple_build_assign | |
3506 | (result, BIT_IOR_EXPR, host_eq, dev_eq); | |
3507 | gimple_set_location (result_ass, loc); | |
3508 | gsi_insert_before (gsi, result_ass, GSI_SAME_STMT); | |
3509 | ||
3510 | replace_call_with_value (gsi, result); | |
3511 | ||
3512 | return true; | |
3513 | } | |
cbdd87d4 | 3514 | |
fe75f732 PK |
3515 | /* Fold realloc (0, n) -> malloc (n). */ |
3516 | ||
3517 | static bool | |
3518 | gimple_fold_builtin_realloc (gimple_stmt_iterator *gsi) | |
3519 | { | |
3520 | gimple *stmt = gsi_stmt (*gsi); | |
3521 | tree arg = gimple_call_arg (stmt, 0); | |
3522 | tree size = gimple_call_arg (stmt, 1); | |
3523 | ||
3524 | if (operand_equal_p (arg, null_pointer_node, 0)) | |
3525 | { | |
3526 | tree fn_malloc = builtin_decl_implicit (BUILT_IN_MALLOC); | |
3527 | if (fn_malloc) | |
3528 | { | |
3529 | gcall *repl = gimple_build_call (fn_malloc, 1, size); | |
3530 | replace_call_with_call_and_fold (gsi, repl); | |
3531 | return true; | |
3532 | } | |
3533 | } | |
3534 | return false; | |
3535 | } | |
3536 | ||
dcb7fae2 RB |
3537 | /* Fold the non-target builtin at *GSI and return whether any simplification |
3538 | was made. */ | |
cbdd87d4 | 3539 | |
fef5a0d9 | 3540 | static bool |
dcb7fae2 | 3541 | gimple_fold_builtin (gimple_stmt_iterator *gsi) |
cbdd87d4 | 3542 | { |
538dd0b7 | 3543 | gcall *stmt = as_a <gcall *>(gsi_stmt (*gsi)); |
fef5a0d9 | 3544 | tree callee = gimple_call_fndecl (stmt); |
cbdd87d4 | 3545 | |
dcb7fae2 RB |
3546 | /* Give up for always_inline inline builtins until they are |
3547 | inlined. */ | |
3548 | if (avoid_folding_inline_builtin (callee)) | |
3549 | return false; | |
cbdd87d4 | 3550 | |
edd7ae68 RB |
3551 | unsigned n = gimple_call_num_args (stmt); |
3552 | enum built_in_function fcode = DECL_FUNCTION_CODE (callee); | |
3553 | switch (fcode) | |
cbdd87d4 | 3554 | { |
b3d8d88e MS |
3555 | case BUILT_IN_BCMP: |
3556 | return gimple_fold_builtin_bcmp (gsi); | |
3557 | case BUILT_IN_BCOPY: | |
3558 | return gimple_fold_builtin_bcopy (gsi); | |
dcb7fae2 | 3559 | case BUILT_IN_BZERO: |
b3d8d88e MS |
3560 | return gimple_fold_builtin_bzero (gsi); |
3561 | ||
dcb7fae2 RB |
3562 | case BUILT_IN_MEMSET: |
3563 | return gimple_fold_builtin_memset (gsi, | |
3564 | gimple_call_arg (stmt, 1), | |
3565 | gimple_call_arg (stmt, 2)); | |
dcb7fae2 RB |
3566 | case BUILT_IN_MEMCPY: |
3567 | return gimple_fold_builtin_memory_op (gsi, gimple_call_arg (stmt, 0), | |
3568 | gimple_call_arg (stmt, 1), 0); | |
3569 | case BUILT_IN_MEMPCPY: | |
3570 | return gimple_fold_builtin_memory_op (gsi, gimple_call_arg (stmt, 0), | |
3571 | gimple_call_arg (stmt, 1), 1); | |
3572 | case BUILT_IN_MEMMOVE: | |
3573 | return gimple_fold_builtin_memory_op (gsi, gimple_call_arg (stmt, 0), | |
3574 | gimple_call_arg (stmt, 1), 3); | |
3575 | case BUILT_IN_SPRINTF_CHK: | |
3576 | case BUILT_IN_VSPRINTF_CHK: | |
edd7ae68 | 3577 | return gimple_fold_builtin_sprintf_chk (gsi, fcode); |
dcb7fae2 RB |
3578 | case BUILT_IN_STRCAT_CHK: |
3579 | return gimple_fold_builtin_strcat_chk (gsi); | |
745583f9 RB |
3580 | case BUILT_IN_STRNCAT_CHK: |
3581 | return gimple_fold_builtin_strncat_chk (gsi); | |
cbdd87d4 | 3582 | case BUILT_IN_STRLEN: |
dcb7fae2 | 3583 | return gimple_fold_builtin_strlen (gsi); |
cbdd87d4 | 3584 | case BUILT_IN_STRCPY: |
dcb7fae2 | 3585 | return gimple_fold_builtin_strcpy (gsi, |
fef5a0d9 | 3586 | gimple_call_arg (stmt, 0), |
dcb7fae2 | 3587 | gimple_call_arg (stmt, 1)); |
cbdd87d4 | 3588 | case BUILT_IN_STRNCPY: |
dcb7fae2 | 3589 | return gimple_fold_builtin_strncpy (gsi, |
fef5a0d9 RB |
3590 | gimple_call_arg (stmt, 0), |
3591 | gimple_call_arg (stmt, 1), | |
dcb7fae2 | 3592 | gimple_call_arg (stmt, 2)); |
9a7eefec | 3593 | case BUILT_IN_STRCAT: |
dcb7fae2 RB |
3594 | return gimple_fold_builtin_strcat (gsi, gimple_call_arg (stmt, 0), |
3595 | gimple_call_arg (stmt, 1)); | |
ad03a744 RB |
3596 | case BUILT_IN_STRNCAT: |
3597 | return gimple_fold_builtin_strncat (gsi); | |
71dea1dd | 3598 | case BUILT_IN_INDEX: |
912d9ec3 | 3599 | case BUILT_IN_STRCHR: |
71dea1dd WD |
3600 | return gimple_fold_builtin_strchr (gsi, false); |
3601 | case BUILT_IN_RINDEX: | |
3602 | case BUILT_IN_STRRCHR: | |
3603 | return gimple_fold_builtin_strchr (gsi, true); | |
c8952930 JJ |
3604 | case BUILT_IN_STRSTR: |
3605 | return gimple_fold_builtin_strstr (gsi); | |
a918bfbf ML |
3606 | case BUILT_IN_STRCMP: |
3607 | case BUILT_IN_STRCASECMP: | |
3608 | case BUILT_IN_STRNCMP: | |
3609 | case BUILT_IN_STRNCASECMP: | |
3610 | return gimple_fold_builtin_string_compare (gsi); | |
488c6247 ML |
3611 | case BUILT_IN_MEMCHR: |
3612 | return gimple_fold_builtin_memchr (gsi); | |
cbdd87d4 | 3613 | case BUILT_IN_FPUTS: |
dcb7fae2 RB |
3614 | return gimple_fold_builtin_fputs (gsi, gimple_call_arg (stmt, 0), |
3615 | gimple_call_arg (stmt, 1), false); | |
cbdd87d4 | 3616 | case BUILT_IN_FPUTS_UNLOCKED: |
dcb7fae2 RB |
3617 | return gimple_fold_builtin_fputs (gsi, gimple_call_arg (stmt, 0), |
3618 | gimple_call_arg (stmt, 1), true); | |
cbdd87d4 RG |
3619 | case BUILT_IN_MEMCPY_CHK: |
3620 | case BUILT_IN_MEMPCPY_CHK: | |
3621 | case BUILT_IN_MEMMOVE_CHK: | |
3622 | case BUILT_IN_MEMSET_CHK: | |
dcb7fae2 | 3623 | return gimple_fold_builtin_memory_chk (gsi, |
fef5a0d9 RB |
3624 | gimple_call_arg (stmt, 0), |
3625 | gimple_call_arg (stmt, 1), | |
3626 | gimple_call_arg (stmt, 2), | |
3627 | gimple_call_arg (stmt, 3), | |
edd7ae68 | 3628 | fcode); |
2625bb5d RB |
3629 | case BUILT_IN_STPCPY: |
3630 | return gimple_fold_builtin_stpcpy (gsi); | |
cbdd87d4 RG |
3631 | case BUILT_IN_STRCPY_CHK: |
3632 | case BUILT_IN_STPCPY_CHK: | |
dcb7fae2 | 3633 | return gimple_fold_builtin_stxcpy_chk (gsi, |
fef5a0d9 RB |
3634 | gimple_call_arg (stmt, 0), |
3635 | gimple_call_arg (stmt, 1), | |
3636 | gimple_call_arg (stmt, 2), | |
edd7ae68 | 3637 | fcode); |
cbdd87d4 | 3638 | case BUILT_IN_STRNCPY_CHK: |
f3fc9b80 | 3639 | case BUILT_IN_STPNCPY_CHK: |
fef5a0d9 RB |
3640 | return gimple_fold_builtin_stxncpy_chk (gsi, |
3641 | gimple_call_arg (stmt, 0), | |
3642 | gimple_call_arg (stmt, 1), | |
3643 | gimple_call_arg (stmt, 2), | |
3644 | gimple_call_arg (stmt, 3), | |
edd7ae68 | 3645 | fcode); |
cbdd87d4 RG |
3646 | case BUILT_IN_SNPRINTF_CHK: |
3647 | case BUILT_IN_VSNPRINTF_CHK: | |
edd7ae68 | 3648 | return gimple_fold_builtin_snprintf_chk (gsi, fcode); |
a104bd88 | 3649 | |
edd7ae68 RB |
3650 | case BUILT_IN_FPRINTF: |
3651 | case BUILT_IN_FPRINTF_UNLOCKED: | |
3652 | case BUILT_IN_VFPRINTF: | |
3653 | if (n == 2 || n == 3) | |
3654 | return gimple_fold_builtin_fprintf (gsi, | |
3655 | gimple_call_arg (stmt, 0), | |
3656 | gimple_call_arg (stmt, 1), | |
3657 | n == 3 | |
3658 | ? gimple_call_arg (stmt, 2) | |
3659 | : NULL_TREE, | |
3660 | fcode); | |
3661 | break; | |
3662 | case BUILT_IN_FPRINTF_CHK: | |
3663 | case BUILT_IN_VFPRINTF_CHK: | |
3664 | if (n == 3 || n == 4) | |
3665 | return gimple_fold_builtin_fprintf (gsi, | |
3666 | gimple_call_arg (stmt, 0), | |
3667 | gimple_call_arg (stmt, 2), | |
3668 | n == 4 | |
3669 | ? gimple_call_arg (stmt, 3) | |
3670 | : NULL_TREE, | |
3671 | fcode); | |
3672 | break; | |
ad03a744 RB |
3673 | case BUILT_IN_PRINTF: |
3674 | case BUILT_IN_PRINTF_UNLOCKED: | |
3675 | case BUILT_IN_VPRINTF: | |
3676 | if (n == 1 || n == 2) | |
3677 | return gimple_fold_builtin_printf (gsi, gimple_call_arg (stmt, 0), | |
3678 | n == 2 | |
3679 | ? gimple_call_arg (stmt, 1) | |
3680 | : NULL_TREE, fcode); | |
3681 | break; | |
3682 | case BUILT_IN_PRINTF_CHK: | |
3683 | case BUILT_IN_VPRINTF_CHK: | |
3684 | if (n == 2 || n == 3) | |
3685 | return gimple_fold_builtin_printf (gsi, gimple_call_arg (stmt, 1), | |
3686 | n == 3 | |
3687 | ? gimple_call_arg (stmt, 2) | |
3688 | : NULL_TREE, fcode); | |
242a37f1 | 3689 | break; |
48126138 NS |
3690 | case BUILT_IN_ACC_ON_DEVICE: |
3691 | return gimple_fold_builtin_acc_on_device (gsi, | |
3692 | gimple_call_arg (stmt, 0)); | |
fe75f732 PK |
3693 | case BUILT_IN_REALLOC: |
3694 | return gimple_fold_builtin_realloc (gsi); | |
3695 | ||
fef5a0d9 RB |
3696 | default:; |
3697 | } | |
3698 | ||
3699 | /* Try the generic builtin folder. */ | |
3700 | bool ignore = (gimple_call_lhs (stmt) == NULL); | |
3701 | tree result = fold_call_stmt (stmt, ignore); | |
3702 | if (result) | |
3703 | { | |
3704 | if (ignore) | |
3705 | STRIP_NOPS (result); | |
3706 | else | |
3707 | result = fold_convert (gimple_call_return_type (stmt), result); | |
3708 | if (!update_call_from_tree (gsi, result)) | |
3709 | gimplify_and_update_call_from_tree (gsi, result); | |
3710 | return true; | |
3711 | } | |
3712 | ||
3713 | return false; | |
3714 | } | |
3715 | ||
451e8dae NS |
3716 | /* Transform IFN_GOACC_DIM_SIZE and IFN_GOACC_DIM_POS internal |
3717 | function calls to constants, where possible. */ | |
3718 | ||
3719 | static tree | |
3720 | fold_internal_goacc_dim (const gimple *call) | |
3721 | { | |
629b3d75 MJ |
3722 | int axis = oacc_get_ifn_dim_arg (call); |
3723 | int size = oacc_get_fn_dim_size (current_function_decl, axis); | |
451e8dae | 3724 | tree result = NULL_TREE; |
67d2229e | 3725 | tree type = TREE_TYPE (gimple_call_lhs (call)); |
451e8dae | 3726 | |
67d2229e | 3727 | switch (gimple_call_internal_fn (call)) |
451e8dae | 3728 | { |
67d2229e TV |
3729 | case IFN_GOACC_DIM_POS: |
3730 | /* If the size is 1, we know the answer. */ | |
3731 | if (size == 1) | |
3732 | result = build_int_cst (type, 0); | |
3733 | break; | |
3734 | case IFN_GOACC_DIM_SIZE: | |
3735 | /* If the size is not dynamic, we know the answer. */ | |
3736 | if (size) | |
3737 | result = build_int_cst (type, size); | |
3738 | break; | |
3739 | default: | |
3740 | break; | |
451e8dae NS |
3741 | } |
3742 | ||
3743 | return result; | |
3744 | } | |
3745 | ||
849a76a5 JJ |
3746 | /* Return true if stmt is __atomic_compare_exchange_N call which is suitable |
3747 | for conversion into ATOMIC_COMPARE_EXCHANGE if the second argument is | |
3748 | &var where var is only addressable because of such calls. */ | |
3749 | ||
3750 | bool | |
3751 | optimize_atomic_compare_exchange_p (gimple *stmt) | |
3752 | { | |
3753 | if (gimple_call_num_args (stmt) != 6 | |
3754 | || !flag_inline_atomics | |
3755 | || !optimize | |
45b2222a | 3756 | || sanitize_flags_p (SANITIZE_THREAD | SANITIZE_ADDRESS) |
849a76a5 JJ |
3757 | || !gimple_call_builtin_p (stmt, BUILT_IN_NORMAL) |
3758 | || !gimple_vdef (stmt) | |
3759 | || !gimple_vuse (stmt)) | |
3760 | return false; | |
3761 | ||
3762 | tree fndecl = gimple_call_fndecl (stmt); | |
3763 | switch (DECL_FUNCTION_CODE (fndecl)) | |
3764 | { | |
3765 | case BUILT_IN_ATOMIC_COMPARE_EXCHANGE_1: | |
3766 | case BUILT_IN_ATOMIC_COMPARE_EXCHANGE_2: | |
3767 | case BUILT_IN_ATOMIC_COMPARE_EXCHANGE_4: | |
3768 | case BUILT_IN_ATOMIC_COMPARE_EXCHANGE_8: | |
3769 | case BUILT_IN_ATOMIC_COMPARE_EXCHANGE_16: | |
3770 | break; | |
3771 | default: | |
3772 | return false; | |
3773 | } | |
3774 | ||
3775 | tree expected = gimple_call_arg (stmt, 1); | |
3776 | if (TREE_CODE (expected) != ADDR_EXPR | |
1de3c940 JJ |
3777 | || !SSA_VAR_P (TREE_OPERAND (expected, 0))) |
3778 | return false; | |
3779 | ||
3780 | tree etype = TREE_TYPE (TREE_OPERAND (expected, 0)); | |
3781 | if (!is_gimple_reg_type (etype) | |
849a76a5 | 3782 | || !auto_var_in_fn_p (TREE_OPERAND (expected, 0), current_function_decl) |
1de3c940 JJ |
3783 | || TREE_THIS_VOLATILE (etype) |
3784 | || VECTOR_TYPE_P (etype) | |
3785 | || TREE_CODE (etype) == COMPLEX_TYPE | |
3786 | /* Don't optimize floating point expected vars, VIEW_CONVERT_EXPRs | |
3787 | might not preserve all the bits. See PR71716. */ | |
3788 | || SCALAR_FLOAT_TYPE_P (etype) | |
73a699ae RS |
3789 | || maybe_ne (TYPE_PRECISION (etype), |
3790 | GET_MODE_BITSIZE (TYPE_MODE (etype)))) | |
849a76a5 JJ |
3791 | return false; |
3792 | ||
3793 | tree weak = gimple_call_arg (stmt, 3); | |
3794 | if (!integer_zerop (weak) && !integer_onep (weak)) | |
3795 | return false; | |
3796 | ||
3797 | tree parmt = TYPE_ARG_TYPES (TREE_TYPE (fndecl)); | |
3798 | tree itype = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (parmt))); | |
3799 | machine_mode mode = TYPE_MODE (itype); | |
3800 | ||
3801 | if (direct_optab_handler (atomic_compare_and_swap_optab, mode) | |
3802 | == CODE_FOR_nothing | |
3803 | && optab_handler (sync_compare_and_swap_optab, mode) == CODE_FOR_nothing) | |
3804 | return false; | |
3805 | ||
cf098191 | 3806 | if (maybe_ne (int_size_in_bytes (etype), GET_MODE_SIZE (mode))) |
849a76a5 JJ |
3807 | return false; |
3808 | ||
3809 | return true; | |
3810 | } | |
3811 | ||
3812 | /* Fold | |
3813 | r = __atomic_compare_exchange_N (p, &e, d, w, s, f); | |
3814 | into | |
3815 | _Complex uintN_t t = ATOMIC_COMPARE_EXCHANGE (p, e, d, w * 256 + N, s, f); | |
3816 | i = IMAGPART_EXPR <t>; | |
3817 | r = (_Bool) i; | |
3818 | e = REALPART_EXPR <t>; */ | |
3819 | ||
3820 | void | |
3821 | fold_builtin_atomic_compare_exchange (gimple_stmt_iterator *gsi) | |
3822 | { | |
3823 | gimple *stmt = gsi_stmt (*gsi); | |
3824 | tree fndecl = gimple_call_fndecl (stmt); | |
3825 | tree parmt = TYPE_ARG_TYPES (TREE_TYPE (fndecl)); | |
3826 | tree itype = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (parmt))); | |
3827 | tree ctype = build_complex_type (itype); | |
3828 | tree expected = TREE_OPERAND (gimple_call_arg (stmt, 1), 0); | |
cc195d46 JJ |
3829 | bool throws = false; |
3830 | edge e = NULL; | |
849a76a5 JJ |
3831 | gimple *g = gimple_build_assign (make_ssa_name (TREE_TYPE (expected)), |
3832 | expected); | |
3833 | gsi_insert_before (gsi, g, GSI_SAME_STMT); | |
3834 | gimple_stmt_iterator gsiret = gsi_for_stmt (g); | |
3835 | if (!useless_type_conversion_p (itype, TREE_TYPE (expected))) | |
3836 | { | |
3837 | g = gimple_build_assign (make_ssa_name (itype), VIEW_CONVERT_EXPR, | |
3838 | build1 (VIEW_CONVERT_EXPR, itype, | |
3839 | gimple_assign_lhs (g))); | |
3840 | gsi_insert_before (gsi, g, GSI_SAME_STMT); | |
3841 | } | |
3842 | int flag = (integer_onep (gimple_call_arg (stmt, 3)) ? 256 : 0) | |
3843 | + int_size_in_bytes (itype); | |
3844 | g = gimple_build_call_internal (IFN_ATOMIC_COMPARE_EXCHANGE, 6, | |
3845 | gimple_call_arg (stmt, 0), | |
3846 | gimple_assign_lhs (g), | |
3847 | gimple_call_arg (stmt, 2), | |
3848 | build_int_cst (integer_type_node, flag), | |
3849 | gimple_call_arg (stmt, 4), | |
3850 | gimple_call_arg (stmt, 5)); | |
3851 | tree lhs = make_ssa_name (ctype); | |
3852 | gimple_call_set_lhs (g, lhs); | |
3853 | gimple_set_vdef (g, gimple_vdef (stmt)); | |
3854 | gimple_set_vuse (g, gimple_vuse (stmt)); | |
3855 | SSA_NAME_DEF_STMT (gimple_vdef (g)) = g; | |
cc195d46 JJ |
3856 | tree oldlhs = gimple_call_lhs (stmt); |
3857 | if (stmt_can_throw_internal (stmt)) | |
3858 | { | |
3859 | throws = true; | |
3860 | e = find_fallthru_edge (gsi_bb (*gsi)->succs); | |
3861 | } | |
3862 | gimple_call_set_nothrow (as_a <gcall *> (g), | |
3863 | gimple_call_nothrow_p (as_a <gcall *> (stmt))); | |
3864 | gimple_call_set_lhs (stmt, NULL_TREE); | |
3865 | gsi_replace (gsi, g, true); | |
3866 | if (oldlhs) | |
849a76a5 | 3867 | { |
849a76a5 JJ |
3868 | g = gimple_build_assign (make_ssa_name (itype), IMAGPART_EXPR, |
3869 | build1 (IMAGPART_EXPR, itype, lhs)); | |
cc195d46 JJ |
3870 | if (throws) |
3871 | { | |
3872 | gsi_insert_on_edge_immediate (e, g); | |
3873 | *gsi = gsi_for_stmt (g); | |
3874 | } | |
3875 | else | |
3876 | gsi_insert_after (gsi, g, GSI_NEW_STMT); | |
3877 | g = gimple_build_assign (oldlhs, NOP_EXPR, gimple_assign_lhs (g)); | |
3878 | gsi_insert_after (gsi, g, GSI_NEW_STMT); | |
849a76a5 | 3879 | } |
849a76a5 JJ |
3880 | g = gimple_build_assign (make_ssa_name (itype), REALPART_EXPR, |
3881 | build1 (REALPART_EXPR, itype, lhs)); | |
cc195d46 JJ |
3882 | if (throws && oldlhs == NULL_TREE) |
3883 | { | |
3884 | gsi_insert_on_edge_immediate (e, g); | |
3885 | *gsi = gsi_for_stmt (g); | |
3886 | } | |
3887 | else | |
3888 | gsi_insert_after (gsi, g, GSI_NEW_STMT); | |
849a76a5 JJ |
3889 | if (!useless_type_conversion_p (TREE_TYPE (expected), itype)) |
3890 | { | |
3891 | g = gimple_build_assign (make_ssa_name (TREE_TYPE (expected)), | |
3892 | VIEW_CONVERT_EXPR, | |
3893 | build1 (VIEW_CONVERT_EXPR, TREE_TYPE (expected), | |
3894 | gimple_assign_lhs (g))); | |
3895 | gsi_insert_after (gsi, g, GSI_NEW_STMT); | |
3896 | } | |
3897 | g = gimple_build_assign (expected, SSA_NAME, gimple_assign_lhs (g)); | |
3898 | gsi_insert_after (gsi, g, GSI_NEW_STMT); | |
3899 | *gsi = gsiret; | |
3900 | } | |
3901 | ||
1304953e JJ |
3902 | /* Return true if ARG0 CODE ARG1 in infinite signed precision operation |
3903 | doesn't fit into TYPE. The test for overflow should be regardless of | |
3904 | -fwrapv, and even for unsigned types. */ | |
3905 | ||
3906 | bool | |
3907 | arith_overflowed_p (enum tree_code code, const_tree type, | |
3908 | const_tree arg0, const_tree arg1) | |
3909 | { | |
3910 | typedef FIXED_WIDE_INT (WIDE_INT_MAX_PRECISION * 2) widest2_int; | |
3911 | typedef generic_wide_int <wi::extended_tree <WIDE_INT_MAX_PRECISION * 2> > | |
3912 | widest2_int_cst; | |
3913 | widest2_int warg0 = widest2_int_cst (arg0); | |
3914 | widest2_int warg1 = widest2_int_cst (arg1); | |
3915 | widest2_int wres; | |
3916 | switch (code) | |
3917 | { | |
3918 | case PLUS_EXPR: wres = wi::add (warg0, warg1); break; | |
3919 | case MINUS_EXPR: wres = wi::sub (warg0, warg1); break; | |
3920 | case MULT_EXPR: wres = wi::mul (warg0, warg1); break; | |
3921 | default: gcc_unreachable (); | |
3922 | } | |
3923 | signop sign = TYPE_SIGN (type); | |
3924 | if (sign == UNSIGNED && wi::neg_p (wres)) | |
3925 | return true; | |
3926 | return wi::min_precision (wres, sign) > TYPE_PRECISION (type); | |
3927 | } | |
3928 | ||
cbdd87d4 RG |
3929 | /* Attempt to fold a call statement referenced by the statement iterator GSI. |
3930 | The statement may be replaced by another statement, e.g., if the call | |
3931 | simplifies to a constant value. Return true if any changes were made. | |
3932 | It is assumed that the operands have been previously folded. */ | |
3933 | ||
e021c122 | 3934 | static bool |
ceeffab0 | 3935 | gimple_fold_call (gimple_stmt_iterator *gsi, bool inplace) |
cbdd87d4 | 3936 | { |
538dd0b7 | 3937 | gcall *stmt = as_a <gcall *> (gsi_stmt (*gsi)); |
3b45a007 | 3938 | tree callee; |
e021c122 RG |
3939 | bool changed = false; |
3940 | unsigned i; | |
cbdd87d4 | 3941 | |
e021c122 RG |
3942 | /* Fold *& in call arguments. */ |
3943 | for (i = 0; i < gimple_call_num_args (stmt); ++i) | |
3944 | if (REFERENCE_CLASS_P (gimple_call_arg (stmt, i))) | |
3945 | { | |
3946 | tree tmp = maybe_fold_reference (gimple_call_arg (stmt, i), false); | |
3947 | if (tmp) | |
3948 | { | |
3949 | gimple_call_set_arg (stmt, i, tmp); | |
3950 | changed = true; | |
3951 | } | |
3952 | } | |
3b45a007 RG |
3953 | |
3954 | /* Check for virtual calls that became direct calls. */ | |
3955 | callee = gimple_call_fn (stmt); | |
25583c4f | 3956 | if (callee && TREE_CODE (callee) == OBJ_TYPE_REF) |
3b45a007 | 3957 | { |
49c471e3 MJ |
3958 | if (gimple_call_addr_fndecl (OBJ_TYPE_REF_EXPR (callee)) != NULL_TREE) |
3959 | { | |
450ad0cd JH |
3960 | if (dump_file && virtual_method_call_p (callee) |
3961 | && !possible_polymorphic_call_target_p | |
6f8091fc JH |
3962 | (callee, stmt, cgraph_node::get (gimple_call_addr_fndecl |
3963 | (OBJ_TYPE_REF_EXPR (callee))))) | |
450ad0cd JH |
3964 | { |
3965 | fprintf (dump_file, | |
a70e9985 | 3966 | "Type inheritance inconsistent devirtualization of "); |
450ad0cd JH |
3967 | print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); |
3968 | fprintf (dump_file, " to "); | |
3969 | print_generic_expr (dump_file, callee, TDF_SLIM); | |
3970 | fprintf (dump_file, "\n"); | |
3971 | } | |
3972 | ||
49c471e3 | 3973 | gimple_call_set_fn (stmt, OBJ_TYPE_REF_EXPR (callee)); |
e021c122 RG |
3974 | changed = true; |
3975 | } | |
a70e9985 | 3976 | else if (flag_devirtualize && !inplace && virtual_method_call_p (callee)) |
e021c122 | 3977 | { |
61dd6a2e JH |
3978 | bool final; |
3979 | vec <cgraph_node *>targets | |
058d0a90 | 3980 | = possible_polymorphic_call_targets (callee, stmt, &final); |
2b5f0895 | 3981 | if (final && targets.length () <= 1 && dbg_cnt (devirt)) |
e021c122 | 3982 | { |
a70e9985 | 3983 | tree lhs = gimple_call_lhs (stmt); |
2b5f0895 XDL |
3984 | if (dump_enabled_p ()) |
3985 | { | |
807b7d62 | 3986 | location_t loc = gimple_location_safe (stmt); |
2b5f0895 XDL |
3987 | dump_printf_loc (MSG_OPTIMIZED_LOCATIONS, loc, |
3988 | "folding virtual function call to %s\n", | |
3989 | targets.length () == 1 | |
3990 | ? targets[0]->name () | |
3991 | : "__builtin_unreachable"); | |
3992 | } | |
61dd6a2e | 3993 | if (targets.length () == 1) |
cf3e5a89 | 3994 | { |
18954840 JJ |
3995 | tree fndecl = targets[0]->decl; |
3996 | gimple_call_set_fndecl (stmt, fndecl); | |
cf3e5a89 | 3997 | changed = true; |
18954840 JJ |
3998 | /* If changing the call to __cxa_pure_virtual |
3999 | or similar noreturn function, adjust gimple_call_fntype | |
4000 | too. */ | |
865f7046 | 4001 | if (gimple_call_noreturn_p (stmt) |
18954840 JJ |
4002 | && VOID_TYPE_P (TREE_TYPE (TREE_TYPE (fndecl))) |
4003 | && TYPE_ARG_TYPES (TREE_TYPE (fndecl)) | |
4004 | && (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (fndecl))) | |
4005 | == void_type_node)) | |
4006 | gimple_call_set_fntype (stmt, TREE_TYPE (fndecl)); | |
a70e9985 | 4007 | /* If the call becomes noreturn, remove the lhs. */ |
3cee7e4e MP |
4008 | if (lhs |
4009 | && gimple_call_noreturn_p (stmt) | |
18954840 | 4010 | && (VOID_TYPE_P (TREE_TYPE (gimple_call_fntype (stmt))) |
abd3a68c | 4011 | || should_remove_lhs_p (lhs))) |
a70e9985 JJ |
4012 | { |
4013 | if (TREE_CODE (lhs) == SSA_NAME) | |
4014 | { | |
b731b390 | 4015 | tree var = create_tmp_var (TREE_TYPE (lhs)); |
a70e9985 | 4016 | tree def = get_or_create_ssa_default_def (cfun, var); |
355fe088 | 4017 | gimple *new_stmt = gimple_build_assign (lhs, def); |
a70e9985 JJ |
4018 | gsi_insert_before (gsi, new_stmt, GSI_SAME_STMT); |
4019 | } | |
4020 | gimple_call_set_lhs (stmt, NULL_TREE); | |
4021 | } | |
0b986c6a | 4022 | maybe_remove_unused_call_args (cfun, stmt); |
cf3e5a89 | 4023 | } |
a70e9985 | 4024 | else |
cf3e5a89 JJ |
4025 | { |
4026 | tree fndecl = builtin_decl_implicit (BUILT_IN_UNREACHABLE); | |
355fe088 | 4027 | gimple *new_stmt = gimple_build_call (fndecl, 0); |
cf3e5a89 | 4028 | gimple_set_location (new_stmt, gimple_location (stmt)); |
2da6996c RB |
4029 | /* If the call had a SSA name as lhs morph that into |
4030 | an uninitialized value. */ | |
a70e9985 JJ |
4031 | if (lhs && TREE_CODE (lhs) == SSA_NAME) |
4032 | { | |
b731b390 | 4033 | tree var = create_tmp_var (TREE_TYPE (lhs)); |
2da6996c RB |
4034 | SET_SSA_NAME_VAR_OR_IDENTIFIER (lhs, var); |
4035 | SSA_NAME_DEF_STMT (lhs) = gimple_build_nop (); | |
4036 | set_ssa_default_def (cfun, var, lhs); | |
42e52a51 | 4037 | } |
2da6996c RB |
4038 | gimple_set_vuse (new_stmt, gimple_vuse (stmt)); |
4039 | gimple_set_vdef (new_stmt, gimple_vdef (stmt)); | |
4040 | gsi_replace (gsi, new_stmt, false); | |
cf3e5a89 JJ |
4041 | return true; |
4042 | } | |
e021c122 | 4043 | } |
49c471e3 | 4044 | } |
e021c122 | 4045 | } |
49c471e3 | 4046 | |
f2d3d07e RH |
4047 | /* Check for indirect calls that became direct calls, and then |
4048 | no longer require a static chain. */ | |
4049 | if (gimple_call_chain (stmt)) | |
4050 | { | |
4051 | tree fn = gimple_call_fndecl (stmt); | |
4052 | if (fn && !DECL_STATIC_CHAIN (fn)) | |
4053 | { | |
4054 | gimple_call_set_chain (stmt, NULL); | |
4055 | changed = true; | |
4056 | } | |
4057 | else | |
4058 | { | |
4059 | tree tmp = maybe_fold_reference (gimple_call_chain (stmt), false); | |
4060 | if (tmp) | |
4061 | { | |
4062 | gimple_call_set_chain (stmt, tmp); | |
4063 | changed = true; | |
4064 | } | |
4065 | } | |
4066 | } | |
4067 | ||
e021c122 RG |
4068 | if (inplace) |
4069 | return changed; | |
4070 | ||
4071 | /* Check for builtins that CCP can handle using information not | |
4072 | available in the generic fold routines. */ | |
fef5a0d9 RB |
4073 | if (gimple_call_builtin_p (stmt, BUILT_IN_NORMAL)) |
4074 | { | |
4075 | if (gimple_fold_builtin (gsi)) | |
4076 | changed = true; | |
4077 | } | |
4078 | else if (gimple_call_builtin_p (stmt, BUILT_IN_MD)) | |
e021c122 | 4079 | { |
ea679d55 | 4080 | changed |= targetm.gimple_fold_builtin (gsi); |
3b45a007 | 4081 | } |
368b454d | 4082 | else if (gimple_call_internal_p (stmt)) |
ed9c79e1 | 4083 | { |
368b454d JJ |
4084 | enum tree_code subcode = ERROR_MARK; |
4085 | tree result = NULL_TREE; | |
1304953e JJ |
4086 | bool cplx_result = false; |
4087 | tree overflow = NULL_TREE; | |
368b454d JJ |
4088 | switch (gimple_call_internal_fn (stmt)) |
4089 | { | |
4090 | case IFN_BUILTIN_EXPECT: | |
4091 | result = fold_builtin_expect (gimple_location (stmt), | |
4092 | gimple_call_arg (stmt, 0), | |
4093 | gimple_call_arg (stmt, 1), | |
4094 | gimple_call_arg (stmt, 2)); | |
4095 | break; | |
0e82f089 | 4096 | case IFN_UBSAN_OBJECT_SIZE: |
ca1150f0 JJ |
4097 | { |
4098 | tree offset = gimple_call_arg (stmt, 1); | |
4099 | tree objsize = gimple_call_arg (stmt, 2); | |
4100 | if (integer_all_onesp (objsize) | |
4101 | || (TREE_CODE (offset) == INTEGER_CST | |
4102 | && TREE_CODE (objsize) == INTEGER_CST | |
4103 | && tree_int_cst_le (offset, objsize))) | |
4104 | { | |
4105 | replace_call_with_value (gsi, NULL_TREE); | |
4106 | return true; | |
4107 | } | |
4108 | } | |
4109 | break; | |
4110 | case IFN_UBSAN_PTR: | |
4111 | if (integer_zerop (gimple_call_arg (stmt, 1))) | |
0e82f089 | 4112 | { |
ca1150f0 | 4113 | replace_call_with_value (gsi, NULL_TREE); |
0e82f089 MP |
4114 | return true; |
4115 | } | |
4116 | break; | |
ca1150f0 JJ |
4117 | case IFN_UBSAN_BOUNDS: |
4118 | { | |
4119 | tree index = gimple_call_arg (stmt, 1); | |
4120 | tree bound = gimple_call_arg (stmt, 2); | |
4121 | if (TREE_CODE (index) == INTEGER_CST | |
4122 | && TREE_CODE (bound) == INTEGER_CST) | |
4123 | { | |
4124 | index = fold_convert (TREE_TYPE (bound), index); | |
4125 | if (TREE_CODE (index) == INTEGER_CST | |
4126 | && tree_int_cst_le (index, bound)) | |
4127 | { | |
4128 | replace_call_with_value (gsi, NULL_TREE); | |
4129 | return true; | |
4130 | } | |
4131 | } | |
4132 | } | |
4133 | break; | |
451e8dae NS |
4134 | case IFN_GOACC_DIM_SIZE: |
4135 | case IFN_GOACC_DIM_POS: | |
4136 | result = fold_internal_goacc_dim (stmt); | |
4137 | break; | |
368b454d JJ |
4138 | case IFN_UBSAN_CHECK_ADD: |
4139 | subcode = PLUS_EXPR; | |
4140 | break; | |
4141 | case IFN_UBSAN_CHECK_SUB: | |
4142 | subcode = MINUS_EXPR; | |
4143 | break; | |
4144 | case IFN_UBSAN_CHECK_MUL: | |
4145 | subcode = MULT_EXPR; | |
4146 | break; | |
1304953e JJ |
4147 | case IFN_ADD_OVERFLOW: |
4148 | subcode = PLUS_EXPR; | |
4149 | cplx_result = true; | |
4150 | break; | |
4151 | case IFN_SUB_OVERFLOW: | |
4152 | subcode = MINUS_EXPR; | |
4153 | cplx_result = true; | |
4154 | break; | |
4155 | case IFN_MUL_OVERFLOW: | |
4156 | subcode = MULT_EXPR; | |
4157 | cplx_result = true; | |
4158 | break; | |
368b454d JJ |
4159 | default: |
4160 | break; | |
4161 | } | |
4162 | if (subcode != ERROR_MARK) | |
4163 | { | |
4164 | tree arg0 = gimple_call_arg (stmt, 0); | |
4165 | tree arg1 = gimple_call_arg (stmt, 1); | |
1304953e JJ |
4166 | tree type = TREE_TYPE (arg0); |
4167 | if (cplx_result) | |
4168 | { | |
4169 | tree lhs = gimple_call_lhs (stmt); | |
4170 | if (lhs == NULL_TREE) | |
4171 | type = NULL_TREE; | |
4172 | else | |
4173 | type = TREE_TYPE (TREE_TYPE (lhs)); | |
4174 | } | |
4175 | if (type == NULL_TREE) | |
4176 | ; | |
368b454d | 4177 | /* x = y + 0; x = y - 0; x = y * 0; */ |
1304953e JJ |
4178 | else if (integer_zerop (arg1)) |
4179 | result = subcode == MULT_EXPR ? integer_zero_node : arg0; | |
368b454d JJ |
4180 | /* x = 0 + y; x = 0 * y; */ |
4181 | else if (subcode != MINUS_EXPR && integer_zerop (arg0)) | |
1304953e | 4182 | result = subcode == MULT_EXPR ? integer_zero_node : arg1; |
368b454d JJ |
4183 | /* x = y - y; */ |
4184 | else if (subcode == MINUS_EXPR && operand_equal_p (arg0, arg1, 0)) | |
1304953e | 4185 | result = integer_zero_node; |
368b454d | 4186 | /* x = y * 1; x = 1 * y; */ |
1304953e JJ |
4187 | else if (subcode == MULT_EXPR && integer_onep (arg1)) |
4188 | result = arg0; | |
4189 | else if (subcode == MULT_EXPR && integer_onep (arg0)) | |
4190 | result = arg1; | |
4191 | else if (TREE_CODE (arg0) == INTEGER_CST | |
4192 | && TREE_CODE (arg1) == INTEGER_CST) | |
368b454d | 4193 | { |
1304953e JJ |
4194 | if (cplx_result) |
4195 | result = int_const_binop (subcode, fold_convert (type, arg0), | |
4196 | fold_convert (type, arg1)); | |
4197 | else | |
4198 | result = int_const_binop (subcode, arg0, arg1); | |
4199 | if (result && arith_overflowed_p (subcode, type, arg0, arg1)) | |
4200 | { | |
4201 | if (cplx_result) | |
4202 | overflow = build_one_cst (type); | |
4203 | else | |
4204 | result = NULL_TREE; | |
4205 | } | |
4206 | } | |
4207 | if (result) | |
4208 | { | |
4209 | if (result == integer_zero_node) | |
4210 | result = build_zero_cst (type); | |
4211 | else if (cplx_result && TREE_TYPE (result) != type) | |
4212 | { | |
4213 | if (TREE_CODE (result) == INTEGER_CST) | |
4214 | { | |
4215 | if (arith_overflowed_p (PLUS_EXPR, type, result, | |
4216 | integer_zero_node)) | |
4217 | overflow = build_one_cst (type); | |
4218 | } | |
4219 | else if ((!TYPE_UNSIGNED (TREE_TYPE (result)) | |
4220 | && TYPE_UNSIGNED (type)) | |
4221 | || (TYPE_PRECISION (type) | |
4222 | < (TYPE_PRECISION (TREE_TYPE (result)) | |
4223 | + (TYPE_UNSIGNED (TREE_TYPE (result)) | |
4224 | && !TYPE_UNSIGNED (type))))) | |
4225 | result = NULL_TREE; | |
4226 | if (result) | |
4227 | result = fold_convert (type, result); | |
4228 | } | |
368b454d JJ |
4229 | } |
4230 | } | |
1304953e | 4231 | |
ed9c79e1 JJ |
4232 | if (result) |
4233 | { | |
1304953e JJ |
4234 | if (TREE_CODE (result) == INTEGER_CST && TREE_OVERFLOW (result)) |
4235 | result = drop_tree_overflow (result); | |
4236 | if (cplx_result) | |
4237 | { | |
4238 | if (overflow == NULL_TREE) | |
4239 | overflow = build_zero_cst (TREE_TYPE (result)); | |
4240 | tree ctype = build_complex_type (TREE_TYPE (result)); | |
4241 | if (TREE_CODE (result) == INTEGER_CST | |
4242 | && TREE_CODE (overflow) == INTEGER_CST) | |
4243 | result = build_complex (ctype, result, overflow); | |
4244 | else | |
4245 | result = build2_loc (gimple_location (stmt), COMPLEX_EXPR, | |
4246 | ctype, result, overflow); | |
4247 | } | |
ed9c79e1 JJ |
4248 | if (!update_call_from_tree (gsi, result)) |
4249 | gimplify_and_update_call_from_tree (gsi, result); | |
4250 | changed = true; | |
4251 | } | |
4252 | } | |
3b45a007 | 4253 | |
e021c122 | 4254 | return changed; |
cbdd87d4 RG |
4255 | } |
4256 | ||
e0ee10ed | 4257 | |
89a79e96 RB |
4258 | /* Return true whether NAME has a use on STMT. */ |
4259 | ||
4260 | static bool | |
355fe088 | 4261 | has_use_on_stmt (tree name, gimple *stmt) |
89a79e96 RB |
4262 | { |
4263 | imm_use_iterator iter; | |
4264 | use_operand_p use_p; | |
4265 | FOR_EACH_IMM_USE_FAST (use_p, iter, name) | |
4266 | if (USE_STMT (use_p) == stmt) | |
4267 | return true; | |
4268 | return false; | |
4269 | } | |
4270 | ||
e0ee10ed RB |
4271 | /* Worker for fold_stmt_1 dispatch to pattern based folding with |
4272 | gimple_simplify. | |
4273 | ||
4274 | Replaces *GSI with the simplification result in RCODE and OPS | |
4275 | and the associated statements in *SEQ. Does the replacement | |
4276 | according to INPLACE and returns true if the operation succeeded. */ | |
4277 | ||
4278 | static bool | |
4279 | replace_stmt_with_simplification (gimple_stmt_iterator *gsi, | |
4280 | code_helper rcode, tree *ops, | |
4281 | gimple_seq *seq, bool inplace) | |
4282 | { | |
355fe088 | 4283 | gimple *stmt = gsi_stmt (*gsi); |
e0ee10ed RB |
4284 | |
4285 | /* Play safe and do not allow abnormals to be mentioned in | |
89a79e96 RB |
4286 | newly created statements. See also maybe_push_res_to_seq. |
4287 | As an exception allow such uses if there was a use of the | |
4288 | same SSA name on the old stmt. */ | |
e0ee10ed | 4289 | if ((TREE_CODE (ops[0]) == SSA_NAME |
89a79e96 RB |
4290 | && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (ops[0]) |
4291 | && !has_use_on_stmt (ops[0], stmt)) | |
e0ee10ed RB |
4292 | || (ops[1] |
4293 | && TREE_CODE (ops[1]) == SSA_NAME | |
89a79e96 RB |
4294 | && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (ops[1]) |
4295 | && !has_use_on_stmt (ops[1], stmt)) | |
e0ee10ed RB |
4296 | || (ops[2] |
4297 | && TREE_CODE (ops[2]) == SSA_NAME | |
89a79e96 | 4298 | && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (ops[2]) |
e0237993 JJ |
4299 | && !has_use_on_stmt (ops[2], stmt)) |
4300 | || (COMPARISON_CLASS_P (ops[0]) | |
4301 | && ((TREE_CODE (TREE_OPERAND (ops[0], 0)) == SSA_NAME | |
4302 | && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (TREE_OPERAND (ops[0], 0)) | |
4303 | && !has_use_on_stmt (TREE_OPERAND (ops[0], 0), stmt)) | |
4304 | || (TREE_CODE (TREE_OPERAND (ops[0], 1)) == SSA_NAME | |
4305 | && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (TREE_OPERAND (ops[0], 1)) | |
4306 | && !has_use_on_stmt (TREE_OPERAND (ops[0], 1), stmt))))) | |
e0ee10ed RB |
4307 | return false; |
4308 | ||
fec40d06 RS |
4309 | /* Don't insert new statements when INPLACE is true, even if we could |
4310 | reuse STMT for the final statement. */ | |
4311 | if (inplace && !gimple_seq_empty_p (*seq)) | |
4312 | return false; | |
4313 | ||
538dd0b7 | 4314 | if (gcond *cond_stmt = dyn_cast <gcond *> (stmt)) |
e0ee10ed RB |
4315 | { |
4316 | gcc_assert (rcode.is_tree_code ()); | |
4317 | if (TREE_CODE_CLASS ((enum tree_code)rcode) == tcc_comparison | |
4318 | /* GIMPLE_CONDs condition may not throw. */ | |
4319 | && (!flag_exceptions | |
4320 | || !cfun->can_throw_non_call_exceptions | |
4321 | || !operation_could_trap_p (rcode, | |
4322 | FLOAT_TYPE_P (TREE_TYPE (ops[0])), | |
4323 | false, NULL_TREE))) | |
538dd0b7 | 4324 | gimple_cond_set_condition (cond_stmt, rcode, ops[0], ops[1]); |
e0ee10ed | 4325 | else if (rcode == SSA_NAME) |
538dd0b7 | 4326 | gimple_cond_set_condition (cond_stmt, NE_EXPR, ops[0], |
e0ee10ed RB |
4327 | build_zero_cst (TREE_TYPE (ops[0]))); |
4328 | else if (rcode == INTEGER_CST) | |
4329 | { | |
4330 | if (integer_zerop (ops[0])) | |
538dd0b7 | 4331 | gimple_cond_make_false (cond_stmt); |
e0ee10ed | 4332 | else |
538dd0b7 | 4333 | gimple_cond_make_true (cond_stmt); |
e0ee10ed RB |
4334 | } |
4335 | else if (!inplace) | |
4336 | { | |
4337 | tree res = maybe_push_res_to_seq (rcode, boolean_type_node, | |
4338 | ops, seq); | |
4339 | if (!res) | |
4340 | return false; | |
538dd0b7 | 4341 | gimple_cond_set_condition (cond_stmt, NE_EXPR, res, |
e0ee10ed RB |
4342 | build_zero_cst (TREE_TYPE (res))); |
4343 | } | |
4344 | else | |
4345 | return false; | |
4346 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
4347 | { | |
4348 | fprintf (dump_file, "gimple_simplified to "); | |
4349 | if (!gimple_seq_empty_p (*seq)) | |
4350 | print_gimple_seq (dump_file, *seq, 0, TDF_SLIM); | |
4351 | print_gimple_stmt (dump_file, gsi_stmt (*gsi), | |
4352 | 0, TDF_SLIM); | |
4353 | } | |
4354 | gsi_insert_seq_before (gsi, *seq, GSI_SAME_STMT); | |
4355 | return true; | |
4356 | } | |
4357 | else if (is_gimple_assign (stmt) | |
4358 | && rcode.is_tree_code ()) | |
4359 | { | |
4360 | if (!inplace | |
f3582e54 | 4361 | || gimple_num_ops (stmt) > get_gimple_rhs_num_ops (rcode)) |
e0ee10ed RB |
4362 | { |
4363 | maybe_build_generic_op (rcode, | |
545cd7ec | 4364 | TREE_TYPE (gimple_assign_lhs (stmt)), ops); |
00d66391 | 4365 | gimple_assign_set_rhs_with_ops (gsi, rcode, ops[0], ops[1], ops[2]); |
e0ee10ed RB |
4366 | if (dump_file && (dump_flags & TDF_DETAILS)) |
4367 | { | |
4368 | fprintf (dump_file, "gimple_simplified to "); | |
4369 | if (!gimple_seq_empty_p (*seq)) | |
4370 | print_gimple_seq (dump_file, *seq, 0, TDF_SLIM); | |
4371 | print_gimple_stmt (dump_file, gsi_stmt (*gsi), | |
4372 | 0, TDF_SLIM); | |
4373 | } | |
4374 | gsi_insert_seq_before (gsi, *seq, GSI_SAME_STMT); | |
4375 | return true; | |
4376 | } | |
4377 | } | |
37d486ab | 4378 | else if (rcode.is_fn_code () |
c9e926ce | 4379 | && gimple_call_combined_fn (stmt) == rcode) |
37d486ab RB |
4380 | { |
4381 | unsigned i; | |
4382 | for (i = 0; i < gimple_call_num_args (stmt); ++i) | |
4383 | { | |
4384 | gcc_assert (ops[i] != NULL_TREE); | |
4385 | gimple_call_set_arg (stmt, i, ops[i]); | |
4386 | } | |
4387 | if (i < 3) | |
4388 | gcc_assert (ops[i] == NULL_TREE); | |
fec40d06 RS |
4389 | if (dump_file && (dump_flags & TDF_DETAILS)) |
4390 | { | |
4391 | fprintf (dump_file, "gimple_simplified to "); | |
4392 | if (!gimple_seq_empty_p (*seq)) | |
4393 | print_gimple_seq (dump_file, *seq, 0, TDF_SLIM); | |
4394 | print_gimple_stmt (dump_file, gsi_stmt (*gsi), 0, TDF_SLIM); | |
4395 | } | |
4396 | gsi_insert_seq_before (gsi, *seq, GSI_SAME_STMT); | |
37d486ab RB |
4397 | return true; |
4398 | } | |
e0ee10ed RB |
4399 | else if (!inplace) |
4400 | { | |
4401 | if (gimple_has_lhs (stmt)) | |
4402 | { | |
4403 | tree lhs = gimple_get_lhs (stmt); | |
de665bbd RB |
4404 | if (!maybe_push_res_to_seq (rcode, TREE_TYPE (lhs), |
4405 | ops, seq, lhs)) | |
4406 | return false; | |
e0ee10ed RB |
4407 | if (dump_file && (dump_flags & TDF_DETAILS)) |
4408 | { | |
4409 | fprintf (dump_file, "gimple_simplified to "); | |
4410 | print_gimple_seq (dump_file, *seq, 0, TDF_SLIM); | |
4411 | } | |
4412 | gsi_replace_with_seq_vops (gsi, *seq); | |
4413 | return true; | |
4414 | } | |
4415 | else | |
4416 | gcc_unreachable (); | |
4417 | } | |
4418 | ||
4419 | return false; | |
4420 | } | |
4421 | ||
040292e7 RB |
4422 | /* Canonicalize MEM_REFs invariant address operand after propagation. */ |
4423 | ||
4424 | static bool | |
4425 | maybe_canonicalize_mem_ref_addr (tree *t) | |
4426 | { | |
4427 | bool res = false; | |
4428 | ||
4429 | if (TREE_CODE (*t) == ADDR_EXPR) | |
4430 | t = &TREE_OPERAND (*t, 0); | |
4431 | ||
f17a223d RB |
4432 | /* The C and C++ frontends use an ARRAY_REF for indexing with their |
4433 | generic vector extension. The actual vector referenced is | |
4434 | view-converted to an array type for this purpose. If the index | |
4435 | is constant the canonical representation in the middle-end is a | |
4436 | BIT_FIELD_REF so re-write the former to the latter here. */ | |
4437 | if (TREE_CODE (*t) == ARRAY_REF | |
4438 | && TREE_CODE (TREE_OPERAND (*t, 0)) == VIEW_CONVERT_EXPR | |
4439 | && TREE_CODE (TREE_OPERAND (*t, 1)) == INTEGER_CST | |
4440 | && VECTOR_TYPE_P (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (*t, 0), 0)))) | |
4441 | { | |
4442 | tree vtype = TREE_TYPE (TREE_OPERAND (TREE_OPERAND (*t, 0), 0)); | |
4443 | if (VECTOR_TYPE_P (vtype)) | |
4444 | { | |
4445 | tree low = array_ref_low_bound (*t); | |
4446 | if (TREE_CODE (low) == INTEGER_CST) | |
4447 | { | |
4448 | if (tree_int_cst_le (low, TREE_OPERAND (*t, 1))) | |
4449 | { | |
4450 | widest_int idx = wi::sub (wi::to_widest (TREE_OPERAND (*t, 1)), | |
4451 | wi::to_widest (low)); | |
4452 | idx = wi::mul (idx, wi::to_widest | |
4453 | (TYPE_SIZE (TREE_TYPE (*t)))); | |
4454 | widest_int ext | |
4455 | = wi::add (idx, wi::to_widest (TYPE_SIZE (TREE_TYPE (*t)))); | |
4456 | if (wi::les_p (ext, wi::to_widest (TYPE_SIZE (vtype)))) | |
4457 | { | |
4458 | *t = build3_loc (EXPR_LOCATION (*t), BIT_FIELD_REF, | |
4459 | TREE_TYPE (*t), | |
4460 | TREE_OPERAND (TREE_OPERAND (*t, 0), 0), | |
4461 | TYPE_SIZE (TREE_TYPE (*t)), | |
92e29a5e | 4462 | wide_int_to_tree (bitsizetype, idx)); |
f17a223d RB |
4463 | res = true; |
4464 | } | |
4465 | } | |
4466 | } | |
4467 | } | |
4468 | } | |
4469 | ||
040292e7 RB |
4470 | while (handled_component_p (*t)) |
4471 | t = &TREE_OPERAND (*t, 0); | |
4472 | ||
4473 | /* Canonicalize MEM [&foo.bar, 0] which appears after propagating | |
4474 | of invariant addresses into a SSA name MEM_REF address. */ | |
4475 | if (TREE_CODE (*t) == MEM_REF | |
4476 | || TREE_CODE (*t) == TARGET_MEM_REF) | |
4477 | { | |
4478 | tree addr = TREE_OPERAND (*t, 0); | |
4479 | if (TREE_CODE (addr) == ADDR_EXPR | |
4480 | && (TREE_CODE (TREE_OPERAND (addr, 0)) == MEM_REF | |
4481 | || handled_component_p (TREE_OPERAND (addr, 0)))) | |
4482 | { | |
4483 | tree base; | |
a90c8804 | 4484 | poly_int64 coffset; |
040292e7 RB |
4485 | base = get_addr_base_and_unit_offset (TREE_OPERAND (addr, 0), |
4486 | &coffset); | |
4487 | if (!base) | |
4488 | gcc_unreachable (); | |
4489 | ||
4490 | TREE_OPERAND (*t, 0) = build_fold_addr_expr (base); | |
4491 | TREE_OPERAND (*t, 1) = int_const_binop (PLUS_EXPR, | |
4492 | TREE_OPERAND (*t, 1), | |
4493 | size_int (coffset)); | |
4494 | res = true; | |
4495 | } | |
4496 | gcc_checking_assert (TREE_CODE (TREE_OPERAND (*t, 0)) == DEBUG_EXPR_DECL | |
4497 | || is_gimple_mem_ref_addr (TREE_OPERAND (*t, 0))); | |
4498 | } | |
4499 | ||
4500 | /* Canonicalize back MEM_REFs to plain reference trees if the object | |
4501 | accessed is a decl that has the same access semantics as the MEM_REF. */ | |
4502 | if (TREE_CODE (*t) == MEM_REF | |
4503 | && TREE_CODE (TREE_OPERAND (*t, 0)) == ADDR_EXPR | |
f3dccf50 RB |
4504 | && integer_zerop (TREE_OPERAND (*t, 1)) |
4505 | && MR_DEPENDENCE_CLIQUE (*t) == 0) | |
040292e7 RB |
4506 | { |
4507 | tree decl = TREE_OPERAND (TREE_OPERAND (*t, 0), 0); | |
4508 | tree alias_type = TREE_TYPE (TREE_OPERAND (*t, 1)); | |
4509 | if (/* Same volatile qualification. */ | |
4510 | TREE_THIS_VOLATILE (*t) == TREE_THIS_VOLATILE (decl) | |
4511 | /* Same TBAA behavior with -fstrict-aliasing. */ | |
4512 | && !TYPE_REF_CAN_ALIAS_ALL (alias_type) | |
4513 | && (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) | |
4514 | == TYPE_MAIN_VARIANT (TREE_TYPE (alias_type))) | |
4515 | /* Same alignment. */ | |
4516 | && TYPE_ALIGN (TREE_TYPE (decl)) == TYPE_ALIGN (TREE_TYPE (*t)) | |
4517 | /* We have to look out here to not drop a required conversion | |
4518 | from the rhs to the lhs if *t appears on the lhs or vice-versa | |
4519 | if it appears on the rhs. Thus require strict type | |
4520 | compatibility. */ | |
4521 | && types_compatible_p (TREE_TYPE (*t), TREE_TYPE (decl))) | |
4522 | { | |
4523 | *t = TREE_OPERAND (TREE_OPERAND (*t, 0), 0); | |
4524 | res = true; | |
4525 | } | |
4526 | } | |
4527 | ||
4528 | /* Canonicalize TARGET_MEM_REF in particular with respect to | |
4529 | the indexes becoming constant. */ | |
4530 | else if (TREE_CODE (*t) == TARGET_MEM_REF) | |
4531 | { | |
4532 | tree tem = maybe_fold_tmr (*t); | |
4533 | if (tem) | |
4534 | { | |
4535 | *t = tem; | |
4536 | res = true; | |
4537 | } | |
4538 | } | |
4539 | ||
4540 | return res; | |
4541 | } | |
4542 | ||
cbdd87d4 RG |
4543 | /* Worker for both fold_stmt and fold_stmt_inplace. The INPLACE argument |
4544 | distinguishes both cases. */ | |
4545 | ||
4546 | static bool | |
e0ee10ed | 4547 | fold_stmt_1 (gimple_stmt_iterator *gsi, bool inplace, tree (*valueize) (tree)) |
cbdd87d4 RG |
4548 | { |
4549 | bool changed = false; | |
355fe088 | 4550 | gimple *stmt = gsi_stmt (*gsi); |
a8b85ce9 | 4551 | bool nowarning = gimple_no_warning_p (stmt); |
cbdd87d4 | 4552 | unsigned i; |
a8b85ce9 | 4553 | fold_defer_overflow_warnings (); |
cbdd87d4 | 4554 | |
040292e7 RB |
4555 | /* First do required canonicalization of [TARGET_]MEM_REF addresses |
4556 | after propagation. | |
4557 | ??? This shouldn't be done in generic folding but in the | |
4558 | propagation helpers which also know whether an address was | |
89a79e96 RB |
4559 | propagated. |
4560 | Also canonicalize operand order. */ | |
040292e7 RB |
4561 | switch (gimple_code (stmt)) |
4562 | { | |
4563 | case GIMPLE_ASSIGN: | |
4564 | if (gimple_assign_rhs_class (stmt) == GIMPLE_SINGLE_RHS) | |
4565 | { | |
4566 | tree *rhs = gimple_assign_rhs1_ptr (stmt); | |
4567 | if ((REFERENCE_CLASS_P (*rhs) | |
4568 | || TREE_CODE (*rhs) == ADDR_EXPR) | |
4569 | && maybe_canonicalize_mem_ref_addr (rhs)) | |
4570 | changed = true; | |
4571 | tree *lhs = gimple_assign_lhs_ptr (stmt); | |
4572 | if (REFERENCE_CLASS_P (*lhs) | |
4573 | && maybe_canonicalize_mem_ref_addr (lhs)) | |
4574 | changed = true; | |
4575 | } | |
89a79e96 RB |
4576 | else |
4577 | { | |
4578 | /* Canonicalize operand order. */ | |
4579 | enum tree_code code = gimple_assign_rhs_code (stmt); | |
4580 | if (TREE_CODE_CLASS (code) == tcc_comparison | |
4581 | || commutative_tree_code (code) | |
4582 | || commutative_ternary_tree_code (code)) | |
4583 | { | |
4584 | tree rhs1 = gimple_assign_rhs1 (stmt); | |
4585 | tree rhs2 = gimple_assign_rhs2 (stmt); | |
14e72812 | 4586 | if (tree_swap_operands_p (rhs1, rhs2)) |
89a79e96 RB |
4587 | { |
4588 | gimple_assign_set_rhs1 (stmt, rhs2); | |
4589 | gimple_assign_set_rhs2 (stmt, rhs1); | |
4590 | if (TREE_CODE_CLASS (code) == tcc_comparison) | |
4591 | gimple_assign_set_rhs_code (stmt, | |
4592 | swap_tree_comparison (code)); | |
4593 | changed = true; | |
4594 | } | |
4595 | } | |
4596 | } | |
040292e7 RB |
4597 | break; |
4598 | case GIMPLE_CALL: | |
4599 | { | |
4600 | for (i = 0; i < gimple_call_num_args (stmt); ++i) | |
4601 | { | |
4602 | tree *arg = gimple_call_arg_ptr (stmt, i); | |
4603 | if (REFERENCE_CLASS_P (*arg) | |
4604 | && maybe_canonicalize_mem_ref_addr (arg)) | |
4605 | changed = true; | |
4606 | } | |
4607 | tree *lhs = gimple_call_lhs_ptr (stmt); | |
4608 | if (*lhs | |
4609 | && REFERENCE_CLASS_P (*lhs) | |
4610 | && maybe_canonicalize_mem_ref_addr (lhs)) | |
4611 | changed = true; | |
4612 | break; | |
4613 | } | |
4614 | case GIMPLE_ASM: | |
4615 | { | |
538dd0b7 DM |
4616 | gasm *asm_stmt = as_a <gasm *> (stmt); |
4617 | for (i = 0; i < gimple_asm_noutputs (asm_stmt); ++i) | |
040292e7 | 4618 | { |
538dd0b7 | 4619 | tree link = gimple_asm_output_op (asm_stmt, i); |
040292e7 RB |
4620 | tree op = TREE_VALUE (link); |
4621 | if (REFERENCE_CLASS_P (op) | |
4622 | && maybe_canonicalize_mem_ref_addr (&TREE_VALUE (link))) | |
4623 | changed = true; | |
4624 | } | |
538dd0b7 | 4625 | for (i = 0; i < gimple_asm_ninputs (asm_stmt); ++i) |
040292e7 | 4626 | { |
538dd0b7 | 4627 | tree link = gimple_asm_input_op (asm_stmt, i); |
040292e7 RB |
4628 | tree op = TREE_VALUE (link); |
4629 | if ((REFERENCE_CLASS_P (op) | |
4630 | || TREE_CODE (op) == ADDR_EXPR) | |
4631 | && maybe_canonicalize_mem_ref_addr (&TREE_VALUE (link))) | |
4632 | changed = true; | |
4633 | } | |
4634 | } | |
4635 | break; | |
4636 | case GIMPLE_DEBUG: | |
4637 | if (gimple_debug_bind_p (stmt)) | |
4638 | { | |
4639 | tree *val = gimple_debug_bind_get_value_ptr (stmt); | |
4640 | if (*val | |
4641 | && (REFERENCE_CLASS_P (*val) | |
4642 | || TREE_CODE (*val) == ADDR_EXPR) | |
4643 | && maybe_canonicalize_mem_ref_addr (val)) | |
4644 | changed = true; | |
4645 | } | |
4646 | break; | |
89a79e96 RB |
4647 | case GIMPLE_COND: |
4648 | { | |
4649 | /* Canonicalize operand order. */ | |
4650 | tree lhs = gimple_cond_lhs (stmt); | |
4651 | tree rhs = gimple_cond_rhs (stmt); | |
14e72812 | 4652 | if (tree_swap_operands_p (lhs, rhs)) |
89a79e96 RB |
4653 | { |
4654 | gcond *gc = as_a <gcond *> (stmt); | |
4655 | gimple_cond_set_lhs (gc, rhs); | |
4656 | gimple_cond_set_rhs (gc, lhs); | |
4657 | gimple_cond_set_code (gc, | |
4658 | swap_tree_comparison (gimple_cond_code (gc))); | |
4659 | changed = true; | |
4660 | } | |
4661 | } | |
040292e7 RB |
4662 | default:; |
4663 | } | |
4664 | ||
e0ee10ed RB |
4665 | /* Dispatch to pattern-based folding. */ |
4666 | if (!inplace | |
4667 | || is_gimple_assign (stmt) | |
4668 | || gimple_code (stmt) == GIMPLE_COND) | |
4669 | { | |
4670 | gimple_seq seq = NULL; | |
4671 | code_helper rcode; | |
4672 | tree ops[3] = {}; | |
0ff093d8 RB |
4673 | if (gimple_simplify (stmt, &rcode, ops, inplace ? NULL : &seq, |
4674 | valueize, valueize)) | |
e0ee10ed RB |
4675 | { |
4676 | if (replace_stmt_with_simplification (gsi, rcode, ops, &seq, inplace)) | |
4677 | changed = true; | |
4678 | else | |
4679 | gimple_seq_discard (seq); | |
4680 | } | |
4681 | } | |
4682 | ||
4683 | stmt = gsi_stmt (*gsi); | |
4684 | ||
cbdd87d4 RG |
4685 | /* Fold the main computation performed by the statement. */ |
4686 | switch (gimple_code (stmt)) | |
4687 | { | |
4688 | case GIMPLE_ASSIGN: | |
4689 | { | |
819ec64c RB |
4690 | /* Try to canonicalize for boolean-typed X the comparisons |
4691 | X == 0, X == 1, X != 0, and X != 1. */ | |
4692 | if (gimple_assign_rhs_code (stmt) == EQ_EXPR | |
4693 | || gimple_assign_rhs_code (stmt) == NE_EXPR) | |
5fbcc0ed | 4694 | { |
819ec64c RB |
4695 | tree lhs = gimple_assign_lhs (stmt); |
4696 | tree op1 = gimple_assign_rhs1 (stmt); | |
4697 | tree op2 = gimple_assign_rhs2 (stmt); | |
4698 | tree type = TREE_TYPE (op1); | |
4699 | ||
4700 | /* Check whether the comparison operands are of the same boolean | |
4701 | type as the result type is. | |
4702 | Check that second operand is an integer-constant with value | |
4703 | one or zero. */ | |
4704 | if (TREE_CODE (op2) == INTEGER_CST | |
4705 | && (integer_zerop (op2) || integer_onep (op2)) | |
4706 | && useless_type_conversion_p (TREE_TYPE (lhs), type)) | |
4707 | { | |
4708 | enum tree_code cmp_code = gimple_assign_rhs_code (stmt); | |
4709 | bool is_logical_not = false; | |
4710 | ||
4711 | /* X == 0 and X != 1 is a logical-not.of X | |
4712 | X == 1 and X != 0 is X */ | |
4713 | if ((cmp_code == EQ_EXPR && integer_zerop (op2)) | |
4714 | || (cmp_code == NE_EXPR && integer_onep (op2))) | |
4715 | is_logical_not = true; | |
4716 | ||
4717 | if (is_logical_not == false) | |
4718 | gimple_assign_set_rhs_with_ops (gsi, TREE_CODE (op1), op1); | |
4719 | /* Only for one-bit precision typed X the transformation | |
4720 | !X -> ~X is valied. */ | |
4721 | else if (TYPE_PRECISION (type) == 1) | |
4722 | gimple_assign_set_rhs_with_ops (gsi, BIT_NOT_EXPR, op1); | |
4723 | /* Otherwise we use !X -> X ^ 1. */ | |
4724 | else | |
4725 | gimple_assign_set_rhs_with_ops (gsi, BIT_XOR_EXPR, op1, | |
4726 | build_int_cst (type, 1)); | |
4727 | changed = true; | |
4728 | break; | |
4729 | } | |
5fbcc0ed | 4730 | } |
819ec64c RB |
4731 | |
4732 | unsigned old_num_ops = gimple_num_ops (stmt); | |
4733 | tree lhs = gimple_assign_lhs (stmt); | |
4734 | tree new_rhs = fold_gimple_assign (gsi); | |
cbdd87d4 RG |
4735 | if (new_rhs |
4736 | && !useless_type_conversion_p (TREE_TYPE (lhs), | |
4737 | TREE_TYPE (new_rhs))) | |
4738 | new_rhs = fold_convert (TREE_TYPE (lhs), new_rhs); | |
4739 | if (new_rhs | |
4740 | && (!inplace | |
4741 | || get_gimple_rhs_num_ops (TREE_CODE (new_rhs)) < old_num_ops)) | |
4742 | { | |
4743 | gimple_assign_set_rhs_from_tree (gsi, new_rhs); | |
4744 | changed = true; | |
4745 | } | |
4746 | break; | |
4747 | } | |
4748 | ||
cbdd87d4 | 4749 | case GIMPLE_CALL: |
ceeffab0 | 4750 | changed |= gimple_fold_call (gsi, inplace); |
cbdd87d4 RG |
4751 | break; |
4752 | ||
4753 | case GIMPLE_ASM: | |
4754 | /* Fold *& in asm operands. */ | |
38384150 | 4755 | { |
538dd0b7 | 4756 | gasm *asm_stmt = as_a <gasm *> (stmt); |
38384150 JJ |
4757 | size_t noutputs; |
4758 | const char **oconstraints; | |
4759 | const char *constraint; | |
4760 | bool allows_mem, allows_reg; | |
4761 | ||
538dd0b7 | 4762 | noutputs = gimple_asm_noutputs (asm_stmt); |
38384150 JJ |
4763 | oconstraints = XALLOCAVEC (const char *, noutputs); |
4764 | ||
538dd0b7 | 4765 | for (i = 0; i < gimple_asm_noutputs (asm_stmt); ++i) |
38384150 | 4766 | { |
538dd0b7 | 4767 | tree link = gimple_asm_output_op (asm_stmt, i); |
38384150 JJ |
4768 | tree op = TREE_VALUE (link); |
4769 | oconstraints[i] | |
4770 | = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link))); | |
4771 | if (REFERENCE_CLASS_P (op) | |
4772 | && (op = maybe_fold_reference (op, true)) != NULL_TREE) | |
4773 | { | |
4774 | TREE_VALUE (link) = op; | |
4775 | changed = true; | |
4776 | } | |
4777 | } | |
538dd0b7 | 4778 | for (i = 0; i < gimple_asm_ninputs (asm_stmt); ++i) |
38384150 | 4779 | { |
538dd0b7 | 4780 | tree link = gimple_asm_input_op (asm_stmt, i); |
38384150 JJ |
4781 | tree op = TREE_VALUE (link); |
4782 | constraint | |
4783 | = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link))); | |
4784 | parse_input_constraint (&constraint, 0, 0, noutputs, 0, | |
4785 | oconstraints, &allows_mem, &allows_reg); | |
4786 | if (REFERENCE_CLASS_P (op) | |
4787 | && (op = maybe_fold_reference (op, !allows_reg && allows_mem)) | |
4788 | != NULL_TREE) | |
4789 | { | |
4790 | TREE_VALUE (link) = op; | |
4791 | changed = true; | |
4792 | } | |
4793 | } | |
4794 | } | |
cbdd87d4 RG |
4795 | break; |
4796 | ||
bd422c4a RG |
4797 | case GIMPLE_DEBUG: |
4798 | if (gimple_debug_bind_p (stmt)) | |
4799 | { | |
4800 | tree val = gimple_debug_bind_get_value (stmt); | |
4801 | if (val | |
4802 | && REFERENCE_CLASS_P (val)) | |
4803 | { | |
4804 | tree tem = maybe_fold_reference (val, false); | |
4805 | if (tem) | |
4806 | { | |
4807 | gimple_debug_bind_set_value (stmt, tem); | |
4808 | changed = true; | |
4809 | } | |
4810 | } | |
3e888a5e RG |
4811 | else if (val |
4812 | && TREE_CODE (val) == ADDR_EXPR) | |
4813 | { | |
4814 | tree ref = TREE_OPERAND (val, 0); | |
4815 | tree tem = maybe_fold_reference (ref, false); | |
4816 | if (tem) | |
4817 | { | |
4818 | tem = build_fold_addr_expr_with_type (tem, TREE_TYPE (val)); | |
4819 | gimple_debug_bind_set_value (stmt, tem); | |
4820 | changed = true; | |
4821 | } | |
4822 | } | |
bd422c4a RG |
4823 | } |
4824 | break; | |
4825 | ||
cfe3d653 PK |
4826 | case GIMPLE_RETURN: |
4827 | { | |
4828 | greturn *ret_stmt = as_a<greturn *> (stmt); | |
4829 | tree ret = gimple_return_retval(ret_stmt); | |
4830 | ||
4831 | if (ret && TREE_CODE (ret) == SSA_NAME && valueize) | |
4832 | { | |
4833 | tree val = valueize (ret); | |
1af928db RB |
4834 | if (val && val != ret |
4835 | && may_propagate_copy (ret, val)) | |
cfe3d653 PK |
4836 | { |
4837 | gimple_return_set_retval (ret_stmt, val); | |
4838 | changed = true; | |
4839 | } | |
4840 | } | |
4841 | } | |
4842 | break; | |
4843 | ||
cbdd87d4 RG |
4844 | default:; |
4845 | } | |
4846 | ||
4847 | stmt = gsi_stmt (*gsi); | |
4848 | ||
37376165 RB |
4849 | /* Fold *& on the lhs. */ |
4850 | if (gimple_has_lhs (stmt)) | |
cbdd87d4 RG |
4851 | { |
4852 | tree lhs = gimple_get_lhs (stmt); | |
4853 | if (lhs && REFERENCE_CLASS_P (lhs)) | |
4854 | { | |
4855 | tree new_lhs = maybe_fold_reference (lhs, true); | |
4856 | if (new_lhs) | |
4857 | { | |
4858 | gimple_set_lhs (stmt, new_lhs); | |
4859 | changed = true; | |
4860 | } | |
4861 | } | |
4862 | } | |
4863 | ||
a8b85ce9 | 4864 | fold_undefer_overflow_warnings (changed && !nowarning, stmt, 0); |
cbdd87d4 RG |
4865 | return changed; |
4866 | } | |
4867 | ||
e0ee10ed RB |
4868 | /* Valueziation callback that ends up not following SSA edges. */ |
4869 | ||
4870 | tree | |
4871 | no_follow_ssa_edges (tree) | |
4872 | { | |
4873 | return NULL_TREE; | |
4874 | } | |
4875 | ||
45cc9f96 RB |
4876 | /* Valueization callback that ends up following single-use SSA edges only. */ |
4877 | ||
4878 | tree | |
4879 | follow_single_use_edges (tree val) | |
4880 | { | |
4881 | if (TREE_CODE (val) == SSA_NAME | |
4882 | && !has_single_use (val)) | |
4883 | return NULL_TREE; | |
4884 | return val; | |
4885 | } | |
4886 | ||
cbdd87d4 RG |
4887 | /* Fold the statement pointed to by GSI. In some cases, this function may |
4888 | replace the whole statement with a new one. Returns true iff folding | |
4889 | makes any changes. | |
4890 | The statement pointed to by GSI should be in valid gimple form but may | |
4891 | be in unfolded state as resulting from for example constant propagation | |
4892 | which can produce *&x = 0. */ | |
4893 | ||
4894 | bool | |
4895 | fold_stmt (gimple_stmt_iterator *gsi) | |
4896 | { | |
e0ee10ed RB |
4897 | return fold_stmt_1 (gsi, false, no_follow_ssa_edges); |
4898 | } | |
4899 | ||
4900 | bool | |
4901 | fold_stmt (gimple_stmt_iterator *gsi, tree (*valueize) (tree)) | |
4902 | { | |
4903 | return fold_stmt_1 (gsi, false, valueize); | |
cbdd87d4 RG |
4904 | } |
4905 | ||
59401b92 | 4906 | /* Perform the minimal folding on statement *GSI. Only operations like |
cbdd87d4 RG |
4907 | *&x created by constant propagation are handled. The statement cannot |
4908 | be replaced with a new one. Return true if the statement was | |
4909 | changed, false otherwise. | |
59401b92 | 4910 | The statement *GSI should be in valid gimple form but may |
cbdd87d4 RG |
4911 | be in unfolded state as resulting from for example constant propagation |
4912 | which can produce *&x = 0. */ | |
4913 | ||
4914 | bool | |
59401b92 | 4915 | fold_stmt_inplace (gimple_stmt_iterator *gsi) |
cbdd87d4 | 4916 | { |
355fe088 | 4917 | gimple *stmt = gsi_stmt (*gsi); |
e0ee10ed | 4918 | bool changed = fold_stmt_1 (gsi, true, no_follow_ssa_edges); |
59401b92 | 4919 | gcc_assert (gsi_stmt (*gsi) == stmt); |
cbdd87d4 RG |
4920 | return changed; |
4921 | } | |
4922 | ||
e89065a1 SL |
4923 | /* Canonicalize and possibly invert the boolean EXPR; return NULL_TREE |
4924 | if EXPR is null or we don't know how. | |
4925 | If non-null, the result always has boolean type. */ | |
4926 | ||
4927 | static tree | |
4928 | canonicalize_bool (tree expr, bool invert) | |
4929 | { | |
4930 | if (!expr) | |
4931 | return NULL_TREE; | |
4932 | else if (invert) | |
4933 | { | |
4934 | if (integer_nonzerop (expr)) | |
4935 | return boolean_false_node; | |
4936 | else if (integer_zerop (expr)) | |
4937 | return boolean_true_node; | |
4938 | else if (TREE_CODE (expr) == SSA_NAME) | |
4939 | return fold_build2 (EQ_EXPR, boolean_type_node, expr, | |
4940 | build_int_cst (TREE_TYPE (expr), 0)); | |
98209db3 | 4941 | else if (COMPARISON_CLASS_P (expr)) |
e89065a1 SL |
4942 | return fold_build2 (invert_tree_comparison (TREE_CODE (expr), false), |
4943 | boolean_type_node, | |
4944 | TREE_OPERAND (expr, 0), | |
4945 | TREE_OPERAND (expr, 1)); | |
4946 | else | |
4947 | return NULL_TREE; | |
4948 | } | |
4949 | else | |
4950 | { | |
4951 | if (TREE_CODE (TREE_TYPE (expr)) == BOOLEAN_TYPE) | |
4952 | return expr; | |
4953 | if (integer_nonzerop (expr)) | |
4954 | return boolean_true_node; | |
4955 | else if (integer_zerop (expr)) | |
4956 | return boolean_false_node; | |
4957 | else if (TREE_CODE (expr) == SSA_NAME) | |
4958 | return fold_build2 (NE_EXPR, boolean_type_node, expr, | |
4959 | build_int_cst (TREE_TYPE (expr), 0)); | |
98209db3 | 4960 | else if (COMPARISON_CLASS_P (expr)) |
e89065a1 SL |
4961 | return fold_build2 (TREE_CODE (expr), |
4962 | boolean_type_node, | |
4963 | TREE_OPERAND (expr, 0), | |
4964 | TREE_OPERAND (expr, 1)); | |
4965 | else | |
4966 | return NULL_TREE; | |
4967 | } | |
4968 | } | |
4969 | ||
4970 | /* Check to see if a boolean expression EXPR is logically equivalent to the | |
4971 | comparison (OP1 CODE OP2). Check for various identities involving | |
4972 | SSA_NAMEs. */ | |
4973 | ||
4974 | static bool | |
4975 | same_bool_comparison_p (const_tree expr, enum tree_code code, | |
4976 | const_tree op1, const_tree op2) | |
4977 | { | |
355fe088 | 4978 | gimple *s; |
e89065a1 SL |
4979 | |
4980 | /* The obvious case. */ | |
4981 | if (TREE_CODE (expr) == code | |
4982 | && operand_equal_p (TREE_OPERAND (expr, 0), op1, 0) | |
4983 | && operand_equal_p (TREE_OPERAND (expr, 1), op2, 0)) | |
4984 | return true; | |
4985 | ||
4986 | /* Check for comparing (name, name != 0) and the case where expr | |
4987 | is an SSA_NAME with a definition matching the comparison. */ | |
4988 | if (TREE_CODE (expr) == SSA_NAME | |
4989 | && TREE_CODE (TREE_TYPE (expr)) == BOOLEAN_TYPE) | |
4990 | { | |
4991 | if (operand_equal_p (expr, op1, 0)) | |
4992 | return ((code == NE_EXPR && integer_zerop (op2)) | |
4993 | || (code == EQ_EXPR && integer_nonzerop (op2))); | |
4994 | s = SSA_NAME_DEF_STMT (expr); | |
4995 | if (is_gimple_assign (s) | |
4996 | && gimple_assign_rhs_code (s) == code | |
4997 | && operand_equal_p (gimple_assign_rhs1 (s), op1, 0) | |
4998 | && operand_equal_p (gimple_assign_rhs2 (s), op2, 0)) | |
4999 | return true; | |
5000 | } | |
5001 | ||
5002 | /* If op1 is of the form (name != 0) or (name == 0), and the definition | |
5003 | of name is a comparison, recurse. */ | |
5004 | if (TREE_CODE (op1) == SSA_NAME | |
5005 | && TREE_CODE (TREE_TYPE (op1)) == BOOLEAN_TYPE) | |
5006 | { | |
5007 | s = SSA_NAME_DEF_STMT (op1); | |
5008 | if (is_gimple_assign (s) | |
5009 | && TREE_CODE_CLASS (gimple_assign_rhs_code (s)) == tcc_comparison) | |
5010 | { | |
5011 | enum tree_code c = gimple_assign_rhs_code (s); | |
5012 | if ((c == NE_EXPR && integer_zerop (op2)) | |
5013 | || (c == EQ_EXPR && integer_nonzerop (op2))) | |
5014 | return same_bool_comparison_p (expr, c, | |
5015 | gimple_assign_rhs1 (s), | |
5016 | gimple_assign_rhs2 (s)); | |
5017 | if ((c == EQ_EXPR && integer_zerop (op2)) | |
5018 | || (c == NE_EXPR && integer_nonzerop (op2))) | |
5019 | return same_bool_comparison_p (expr, | |
5020 | invert_tree_comparison (c, false), | |
5021 | gimple_assign_rhs1 (s), | |
5022 | gimple_assign_rhs2 (s)); | |
5023 | } | |
5024 | } | |
5025 | return false; | |
5026 | } | |
5027 | ||
5028 | /* Check to see if two boolean expressions OP1 and OP2 are logically | |
5029 | equivalent. */ | |
5030 | ||
5031 | static bool | |
5032 | same_bool_result_p (const_tree op1, const_tree op2) | |
5033 | { | |
5034 | /* Simple cases first. */ | |
5035 | if (operand_equal_p (op1, op2, 0)) | |
5036 | return true; | |
5037 | ||
5038 | /* Check the cases where at least one of the operands is a comparison. | |
5039 | These are a bit smarter than operand_equal_p in that they apply some | |
5040 | identifies on SSA_NAMEs. */ | |
98209db3 | 5041 | if (COMPARISON_CLASS_P (op2) |
e89065a1 SL |
5042 | && same_bool_comparison_p (op1, TREE_CODE (op2), |
5043 | TREE_OPERAND (op2, 0), | |
5044 | TREE_OPERAND (op2, 1))) | |
5045 | return true; | |
98209db3 | 5046 | if (COMPARISON_CLASS_P (op1) |
e89065a1 SL |
5047 | && same_bool_comparison_p (op2, TREE_CODE (op1), |
5048 | TREE_OPERAND (op1, 0), | |
5049 | TREE_OPERAND (op1, 1))) | |
5050 | return true; | |
5051 | ||
5052 | /* Default case. */ | |
5053 | return false; | |
5054 | } | |
5055 | ||
5056 | /* Forward declarations for some mutually recursive functions. */ | |
5057 | ||
5058 | static tree | |
5059 | and_comparisons_1 (enum tree_code code1, tree op1a, tree op1b, | |
5060 | enum tree_code code2, tree op2a, tree op2b); | |
5061 | static tree | |
5062 | and_var_with_comparison (tree var, bool invert, | |
5063 | enum tree_code code2, tree op2a, tree op2b); | |
5064 | static tree | |
355fe088 | 5065 | and_var_with_comparison_1 (gimple *stmt, |
e89065a1 SL |
5066 | enum tree_code code2, tree op2a, tree op2b); |
5067 | static tree | |
5068 | or_comparisons_1 (enum tree_code code1, tree op1a, tree op1b, | |
5069 | enum tree_code code2, tree op2a, tree op2b); | |
5070 | static tree | |
5071 | or_var_with_comparison (tree var, bool invert, | |
5072 | enum tree_code code2, tree op2a, tree op2b); | |
5073 | static tree | |
355fe088 | 5074 | or_var_with_comparison_1 (gimple *stmt, |
e89065a1 SL |
5075 | enum tree_code code2, tree op2a, tree op2b); |
5076 | ||
5077 | /* Helper function for and_comparisons_1: try to simplify the AND of the | |
5078 | ssa variable VAR with the comparison specified by (OP2A CODE2 OP2B). | |
5079 | If INVERT is true, invert the value of the VAR before doing the AND. | |
5080 | Return NULL_EXPR if we can't simplify this to a single expression. */ | |
5081 | ||
5082 | static tree | |
5083 | and_var_with_comparison (tree var, bool invert, | |
5084 | enum tree_code code2, tree op2a, tree op2b) | |
5085 | { | |
5086 | tree t; | |
355fe088 | 5087 | gimple *stmt = SSA_NAME_DEF_STMT (var); |
e89065a1 SL |
5088 | |
5089 | /* We can only deal with variables whose definitions are assignments. */ | |
5090 | if (!is_gimple_assign (stmt)) | |
5091 | return NULL_TREE; | |
5092 | ||
5093 | /* If we have an inverted comparison, apply DeMorgan's law and rewrite | |
5094 | !var AND (op2a code2 op2b) => !(var OR !(op2a code2 op2b)) | |
5095 | Then we only have to consider the simpler non-inverted cases. */ | |
5096 | if (invert) | |
5097 | t = or_var_with_comparison_1 (stmt, | |
5098 | invert_tree_comparison (code2, false), | |
5099 | op2a, op2b); | |
5100 | else | |
5101 | t = and_var_with_comparison_1 (stmt, code2, op2a, op2b); | |
5102 | return canonicalize_bool (t, invert); | |
5103 | } | |
5104 | ||
5105 | /* Try to simplify the AND of the ssa variable defined by the assignment | |
5106 | STMT with the comparison specified by (OP2A CODE2 OP2B). | |
5107 | Return NULL_EXPR if we can't simplify this to a single expression. */ | |
5108 | ||
5109 | static tree | |
355fe088 | 5110 | and_var_with_comparison_1 (gimple *stmt, |
e89065a1 SL |
5111 | enum tree_code code2, tree op2a, tree op2b) |
5112 | { | |
5113 | tree var = gimple_assign_lhs (stmt); | |
5114 | tree true_test_var = NULL_TREE; | |
5115 | tree false_test_var = NULL_TREE; | |
5116 | enum tree_code innercode = gimple_assign_rhs_code (stmt); | |
5117 | ||
5118 | /* Check for identities like (var AND (var == 0)) => false. */ | |
5119 | if (TREE_CODE (op2a) == SSA_NAME | |
5120 | && TREE_CODE (TREE_TYPE (var)) == BOOLEAN_TYPE) | |
5121 | { | |
5122 | if ((code2 == NE_EXPR && integer_zerop (op2b)) | |
5123 | || (code2 == EQ_EXPR && integer_nonzerop (op2b))) | |
5124 | { | |
5125 | true_test_var = op2a; | |
5126 | if (var == true_test_var) | |
5127 | return var; | |
5128 | } | |
5129 | else if ((code2 == EQ_EXPR && integer_zerop (op2b)) | |
5130 | || (code2 == NE_EXPR && integer_nonzerop (op2b))) | |
5131 | { | |
5132 | false_test_var = op2a; | |
5133 | if (var == false_test_var) | |
5134 | return boolean_false_node; | |
5135 | } | |
5136 | } | |
5137 | ||
5138 | /* If the definition is a comparison, recurse on it. */ | |
5139 | if (TREE_CODE_CLASS (innercode) == tcc_comparison) | |
5140 | { | |
5141 | tree t = and_comparisons_1 (innercode, | |
5142 | gimple_assign_rhs1 (stmt), | |
5143 | gimple_assign_rhs2 (stmt), | |
5144 | code2, | |
5145 | op2a, | |
5146 | op2b); | |
5147 | if (t) | |
5148 | return t; | |
5149 | } | |
5150 | ||
5151 | /* If the definition is an AND or OR expression, we may be able to | |
5152 | simplify by reassociating. */ | |
eb9820c0 KT |
5153 | if (TREE_CODE (TREE_TYPE (var)) == BOOLEAN_TYPE |
5154 | && (innercode == BIT_AND_EXPR || innercode == BIT_IOR_EXPR)) | |
e89065a1 SL |
5155 | { |
5156 | tree inner1 = gimple_assign_rhs1 (stmt); | |
5157 | tree inner2 = gimple_assign_rhs2 (stmt); | |
355fe088 | 5158 | gimple *s; |
e89065a1 SL |
5159 | tree t; |
5160 | tree partial = NULL_TREE; | |
eb9820c0 | 5161 | bool is_and = (innercode == BIT_AND_EXPR); |
e89065a1 SL |
5162 | |
5163 | /* Check for boolean identities that don't require recursive examination | |
5164 | of inner1/inner2: | |
5165 | inner1 AND (inner1 AND inner2) => inner1 AND inner2 => var | |
5166 | inner1 AND (inner1 OR inner2) => inner1 | |
5167 | !inner1 AND (inner1 AND inner2) => false | |
5168 | !inner1 AND (inner1 OR inner2) => !inner1 AND inner2 | |
5169 | Likewise for similar cases involving inner2. */ | |
5170 | if (inner1 == true_test_var) | |
5171 | return (is_and ? var : inner1); | |
5172 | else if (inner2 == true_test_var) | |
5173 | return (is_and ? var : inner2); | |
5174 | else if (inner1 == false_test_var) | |
5175 | return (is_and | |
5176 | ? boolean_false_node | |
5177 | : and_var_with_comparison (inner2, false, code2, op2a, op2b)); | |
5178 | else if (inner2 == false_test_var) | |
5179 | return (is_and | |
5180 | ? boolean_false_node | |
5181 | : and_var_with_comparison (inner1, false, code2, op2a, op2b)); | |
5182 | ||
5183 | /* Next, redistribute/reassociate the AND across the inner tests. | |
5184 | Compute the first partial result, (inner1 AND (op2a code op2b)) */ | |
5185 | if (TREE_CODE (inner1) == SSA_NAME | |
5186 | && is_gimple_assign (s = SSA_NAME_DEF_STMT (inner1)) | |
5187 | && TREE_CODE_CLASS (gimple_assign_rhs_code (s)) == tcc_comparison | |
5188 | && (t = maybe_fold_and_comparisons (gimple_assign_rhs_code (s), | |
5189 | gimple_assign_rhs1 (s), | |
5190 | gimple_assign_rhs2 (s), | |
5191 | code2, op2a, op2b))) | |
5192 | { | |
5193 | /* Handle the AND case, where we are reassociating: | |
5194 | (inner1 AND inner2) AND (op2a code2 op2b) | |
5195 | => (t AND inner2) | |
5196 | If the partial result t is a constant, we win. Otherwise | |
5197 | continue on to try reassociating with the other inner test. */ | |
5198 | if (is_and) | |
5199 | { | |
5200 | if (integer_onep (t)) | |
5201 | return inner2; | |
5202 | else if (integer_zerop (t)) | |
5203 | return boolean_false_node; | |
5204 | } | |
5205 | ||
5206 | /* Handle the OR case, where we are redistributing: | |
5207 | (inner1 OR inner2) AND (op2a code2 op2b) | |
5208 | => (t OR (inner2 AND (op2a code2 op2b))) */ | |
8236c8eb JJ |
5209 | else if (integer_onep (t)) |
5210 | return boolean_true_node; | |
5211 | ||
5212 | /* Save partial result for later. */ | |
5213 | partial = t; | |
e89065a1 SL |
5214 | } |
5215 | ||
5216 | /* Compute the second partial result, (inner2 AND (op2a code op2b)) */ | |
5217 | if (TREE_CODE (inner2) == SSA_NAME | |
5218 | && is_gimple_assign (s = SSA_NAME_DEF_STMT (inner2)) | |
5219 | && TREE_CODE_CLASS (gimple_assign_rhs_code (s)) == tcc_comparison | |
5220 | && (t = maybe_fold_and_comparisons (gimple_assign_rhs_code (s), | |
5221 | gimple_assign_rhs1 (s), | |
5222 | gimple_assign_rhs2 (s), | |
5223 | code2, op2a, op2b))) | |
5224 | { | |
5225 | /* Handle the AND case, where we are reassociating: | |
5226 | (inner1 AND inner2) AND (op2a code2 op2b) | |
5227 | => (inner1 AND t) */ | |
5228 | if (is_and) | |
5229 | { | |
5230 | if (integer_onep (t)) | |
5231 | return inner1; | |
5232 | else if (integer_zerop (t)) | |
5233 | return boolean_false_node; | |
8236c8eb JJ |
5234 | /* If both are the same, we can apply the identity |
5235 | (x AND x) == x. */ | |
5236 | else if (partial && same_bool_result_p (t, partial)) | |
5237 | return t; | |
e89065a1 SL |
5238 | } |
5239 | ||
5240 | /* Handle the OR case. where we are redistributing: | |
5241 | (inner1 OR inner2) AND (op2a code2 op2b) | |
5242 | => (t OR (inner1 AND (op2a code2 op2b))) | |
5243 | => (t OR partial) */ | |
5244 | else | |
5245 | { | |
5246 | if (integer_onep (t)) | |
5247 | return boolean_true_node; | |
5248 | else if (partial) | |
5249 | { | |
5250 | /* We already got a simplification for the other | |
5251 | operand to the redistributed OR expression. The | |
5252 | interesting case is when at least one is false. | |
5253 | Or, if both are the same, we can apply the identity | |
5254 | (x OR x) == x. */ | |
5255 | if (integer_zerop (partial)) | |
5256 | return t; | |
5257 | else if (integer_zerop (t)) | |
5258 | return partial; | |
5259 | else if (same_bool_result_p (t, partial)) | |
5260 | return t; | |
5261 | } | |
5262 | } | |
5263 | } | |
5264 | } | |
5265 | return NULL_TREE; | |
5266 | } | |
5267 | ||
5268 | /* Try to simplify the AND of two comparisons defined by | |
5269 | (OP1A CODE1 OP1B) and (OP2A CODE2 OP2B), respectively. | |
5270 | If this can be done without constructing an intermediate value, | |
5271 | return the resulting tree; otherwise NULL_TREE is returned. | |
5272 | This function is deliberately asymmetric as it recurses on SSA_DEFs | |
5273 | in the first comparison but not the second. */ | |
5274 | ||
5275 | static tree | |
5276 | and_comparisons_1 (enum tree_code code1, tree op1a, tree op1b, | |
5277 | enum tree_code code2, tree op2a, tree op2b) | |
5278 | { | |
ae22ac3c | 5279 | tree truth_type = truth_type_for (TREE_TYPE (op1a)); |
31ed6226 | 5280 | |
e89065a1 SL |
5281 | /* First check for ((x CODE1 y) AND (x CODE2 y)). */ |
5282 | if (operand_equal_p (op1a, op2a, 0) | |
5283 | && operand_equal_p (op1b, op2b, 0)) | |
5284 | { | |
eb9820c0 | 5285 | /* Result will be either NULL_TREE, or a combined comparison. */ |
e89065a1 SL |
5286 | tree t = combine_comparisons (UNKNOWN_LOCATION, |
5287 | TRUTH_ANDIF_EXPR, code1, code2, | |
31ed6226 | 5288 | truth_type, op1a, op1b); |
e89065a1 SL |
5289 | if (t) |
5290 | return t; | |
5291 | } | |
5292 | ||
5293 | /* Likewise the swapped case of the above. */ | |
5294 | if (operand_equal_p (op1a, op2b, 0) | |
5295 | && operand_equal_p (op1b, op2a, 0)) | |
5296 | { | |
eb9820c0 | 5297 | /* Result will be either NULL_TREE, or a combined comparison. */ |
e89065a1 SL |
5298 | tree t = combine_comparisons (UNKNOWN_LOCATION, |
5299 | TRUTH_ANDIF_EXPR, code1, | |
5300 | swap_tree_comparison (code2), | |
31ed6226 | 5301 | truth_type, op1a, op1b); |
e89065a1 SL |
5302 | if (t) |
5303 | return t; | |
5304 | } | |
5305 | ||
5306 | /* If both comparisons are of the same value against constants, we might | |
5307 | be able to merge them. */ | |
5308 | if (operand_equal_p (op1a, op2a, 0) | |
5309 | && TREE_CODE (op1b) == INTEGER_CST | |
5310 | && TREE_CODE (op2b) == INTEGER_CST) | |
5311 | { | |
5312 | int cmp = tree_int_cst_compare (op1b, op2b); | |
5313 | ||
5314 | /* If we have (op1a == op1b), we should either be able to | |
5315 | return that or FALSE, depending on whether the constant op1b | |
5316 | also satisfies the other comparison against op2b. */ | |
5317 | if (code1 == EQ_EXPR) | |
5318 | { | |
5319 | bool done = true; | |
5320 | bool val; | |
5321 | switch (code2) | |
5322 | { | |
5323 | case EQ_EXPR: val = (cmp == 0); break; | |
5324 | case NE_EXPR: val = (cmp != 0); break; | |
5325 | case LT_EXPR: val = (cmp < 0); break; | |
5326 | case GT_EXPR: val = (cmp > 0); break; | |
5327 | case LE_EXPR: val = (cmp <= 0); break; | |
5328 | case GE_EXPR: val = (cmp >= 0); break; | |
5329 | default: done = false; | |
5330 | } | |
5331 | if (done) | |
5332 | { | |
5333 | if (val) | |
5334 | return fold_build2 (code1, boolean_type_node, op1a, op1b); | |
5335 | else | |
5336 | return boolean_false_node; | |
5337 | } | |
5338 | } | |
5339 | /* Likewise if the second comparison is an == comparison. */ | |
5340 | else if (code2 == EQ_EXPR) | |
5341 | { | |
5342 | bool done = true; | |
5343 | bool val; | |
5344 | switch (code1) | |
5345 | { | |
5346 | case EQ_EXPR: val = (cmp == 0); break; | |
5347 | case NE_EXPR: val = (cmp != 0); break; | |
5348 | case LT_EXPR: val = (cmp > 0); break; | |
5349 | case GT_EXPR: val = (cmp < 0); break; | |
5350 | case LE_EXPR: val = (cmp >= 0); break; | |
5351 | case GE_EXPR: val = (cmp <= 0); break; | |
5352 | default: done = false; | |
5353 | } | |
5354 | if (done) | |
5355 | { | |
5356 | if (val) | |
5357 | return fold_build2 (code2, boolean_type_node, op2a, op2b); | |
5358 | else | |
5359 | return boolean_false_node; | |
5360 | } | |
5361 | } | |
5362 | ||
5363 | /* Same business with inequality tests. */ | |
5364 | else if (code1 == NE_EXPR) | |
5365 | { | |
5366 | bool val; | |
5367 | switch (code2) | |
5368 | { | |
5369 | case EQ_EXPR: val = (cmp != 0); break; | |
5370 | case NE_EXPR: val = (cmp == 0); break; | |
5371 | case LT_EXPR: val = (cmp >= 0); break; | |
5372 | case GT_EXPR: val = (cmp <= 0); break; | |
5373 | case LE_EXPR: val = (cmp > 0); break; | |
5374 | case GE_EXPR: val = (cmp < 0); break; | |
5375 | default: | |
5376 | val = false; | |
5377 | } | |
5378 | if (val) | |
5379 | return fold_build2 (code2, boolean_type_node, op2a, op2b); | |
5380 | } | |
5381 | else if (code2 == NE_EXPR) | |
5382 | { | |
5383 | bool val; | |
5384 | switch (code1) | |
5385 | { | |
5386 | case EQ_EXPR: val = (cmp == 0); break; | |
5387 | case NE_EXPR: val = (cmp != 0); break; | |
5388 | case LT_EXPR: val = (cmp <= 0); break; | |
5389 | case GT_EXPR: val = (cmp >= 0); break; | |
5390 | case LE_EXPR: val = (cmp < 0); break; | |
5391 | case GE_EXPR: val = (cmp > 0); break; | |
5392 | default: | |
5393 | val = false; | |
5394 | } | |
5395 | if (val) | |
5396 | return fold_build2 (code1, boolean_type_node, op1a, op1b); | |
5397 | } | |
5398 | ||
5399 | /* Chose the more restrictive of two < or <= comparisons. */ | |
5400 | else if ((code1 == LT_EXPR || code1 == LE_EXPR) | |
5401 | && (code2 == LT_EXPR || code2 == LE_EXPR)) | |
5402 | { | |
5403 | if ((cmp < 0) || (cmp == 0 && code1 == LT_EXPR)) | |
5404 | return fold_build2 (code1, boolean_type_node, op1a, op1b); | |
5405 | else | |
5406 | return fold_build2 (code2, boolean_type_node, op2a, op2b); | |
5407 | } | |
5408 | ||
5409 | /* Likewise chose the more restrictive of two > or >= comparisons. */ | |
5410 | else if ((code1 == GT_EXPR || code1 == GE_EXPR) | |
5411 | && (code2 == GT_EXPR || code2 == GE_EXPR)) | |
5412 | { | |
5413 | if ((cmp > 0) || (cmp == 0 && code1 == GT_EXPR)) | |
5414 | return fold_build2 (code1, boolean_type_node, op1a, op1b); | |
5415 | else | |
5416 | return fold_build2 (code2, boolean_type_node, op2a, op2b); | |
5417 | } | |
5418 | ||
5419 | /* Check for singleton ranges. */ | |
5420 | else if (cmp == 0 | |
5421 | && ((code1 == LE_EXPR && code2 == GE_EXPR) | |
5422 | || (code1 == GE_EXPR && code2 == LE_EXPR))) | |
5423 | return fold_build2 (EQ_EXPR, boolean_type_node, op1a, op2b); | |
5424 | ||
5425 | /* Check for disjoint ranges. */ | |
5426 | else if (cmp <= 0 | |
5427 | && (code1 == LT_EXPR || code1 == LE_EXPR) | |
5428 | && (code2 == GT_EXPR || code2 == GE_EXPR)) | |
5429 | return boolean_false_node; | |
5430 | else if (cmp >= 0 | |
5431 | && (code1 == GT_EXPR || code1 == GE_EXPR) | |
5432 | && (code2 == LT_EXPR || code2 == LE_EXPR)) | |
5433 | return boolean_false_node; | |
5434 | } | |
5435 | ||
5436 | /* Perhaps the first comparison is (NAME != 0) or (NAME == 1) where | |
5437 | NAME's definition is a truth value. See if there are any simplifications | |
5438 | that can be done against the NAME's definition. */ | |
5439 | if (TREE_CODE (op1a) == SSA_NAME | |
5440 | && (code1 == NE_EXPR || code1 == EQ_EXPR) | |
5441 | && (integer_zerop (op1b) || integer_onep (op1b))) | |
5442 | { | |
5443 | bool invert = ((code1 == EQ_EXPR && integer_zerop (op1b)) | |
5444 | || (code1 == NE_EXPR && integer_onep (op1b))); | |
355fe088 | 5445 | gimple *stmt = SSA_NAME_DEF_STMT (op1a); |
e89065a1 SL |
5446 | switch (gimple_code (stmt)) |
5447 | { | |
5448 | case GIMPLE_ASSIGN: | |
5449 | /* Try to simplify by copy-propagating the definition. */ | |
5450 | return and_var_with_comparison (op1a, invert, code2, op2a, op2b); | |
5451 | ||
5452 | case GIMPLE_PHI: | |
5453 | /* If every argument to the PHI produces the same result when | |
5454 | ANDed with the second comparison, we win. | |
5455 | Do not do this unless the type is bool since we need a bool | |
5456 | result here anyway. */ | |
5457 | if (TREE_CODE (TREE_TYPE (op1a)) == BOOLEAN_TYPE) | |
5458 | { | |
5459 | tree result = NULL_TREE; | |
5460 | unsigned i; | |
5461 | for (i = 0; i < gimple_phi_num_args (stmt); i++) | |
5462 | { | |
5463 | tree arg = gimple_phi_arg_def (stmt, i); | |
5464 | ||
5465 | /* If this PHI has itself as an argument, ignore it. | |
5466 | If all the other args produce the same result, | |
5467 | we're still OK. */ | |
5468 | if (arg == gimple_phi_result (stmt)) | |
5469 | continue; | |
5470 | else if (TREE_CODE (arg) == INTEGER_CST) | |
5471 | { | |
5472 | if (invert ? integer_nonzerop (arg) : integer_zerop (arg)) | |
5473 | { | |
5474 | if (!result) | |
5475 | result = boolean_false_node; | |
5476 | else if (!integer_zerop (result)) | |
5477 | return NULL_TREE; | |
5478 | } | |
5479 | else if (!result) | |
5480 | result = fold_build2 (code2, boolean_type_node, | |
5481 | op2a, op2b); | |
5482 | else if (!same_bool_comparison_p (result, | |
5483 | code2, op2a, op2b)) | |
5484 | return NULL_TREE; | |
5485 | } | |
0e8b84ec JJ |
5486 | else if (TREE_CODE (arg) == SSA_NAME |
5487 | && !SSA_NAME_IS_DEFAULT_DEF (arg)) | |
e89065a1 | 5488 | { |
6c66f733 | 5489 | tree temp; |
355fe088 | 5490 | gimple *def_stmt = SSA_NAME_DEF_STMT (arg); |
6c66f733 JJ |
5491 | /* In simple cases we can look through PHI nodes, |
5492 | but we have to be careful with loops. | |
5493 | See PR49073. */ | |
5494 | if (! dom_info_available_p (CDI_DOMINATORS) | |
5495 | || gimple_bb (def_stmt) == gimple_bb (stmt) | |
5496 | || dominated_by_p (CDI_DOMINATORS, | |
5497 | gimple_bb (def_stmt), | |
5498 | gimple_bb (stmt))) | |
5499 | return NULL_TREE; | |
5500 | temp = and_var_with_comparison (arg, invert, code2, | |
5501 | op2a, op2b); | |
e89065a1 SL |
5502 | if (!temp) |
5503 | return NULL_TREE; | |
5504 | else if (!result) | |
5505 | result = temp; | |
5506 | else if (!same_bool_result_p (result, temp)) | |
5507 | return NULL_TREE; | |
5508 | } | |
5509 | else | |
5510 | return NULL_TREE; | |
5511 | } | |
5512 | return result; | |
5513 | } | |
5514 | ||
5515 | default: | |
5516 | break; | |
5517 | } | |
5518 | } | |
5519 | return NULL_TREE; | |
5520 | } | |
5521 | ||
5522 | /* Try to simplify the AND of two comparisons, specified by | |
5523 | (OP1A CODE1 OP1B) and (OP2B CODE2 OP2B), respectively. | |
5524 | If this can be simplified to a single expression (without requiring | |
5525 | introducing more SSA variables to hold intermediate values), | |
5526 | return the resulting tree. Otherwise return NULL_TREE. | |
5527 | If the result expression is non-null, it has boolean type. */ | |
5528 | ||
5529 | tree | |
5530 | maybe_fold_and_comparisons (enum tree_code code1, tree op1a, tree op1b, | |
5531 | enum tree_code code2, tree op2a, tree op2b) | |
5532 | { | |
5533 | tree t = and_comparisons_1 (code1, op1a, op1b, code2, op2a, op2b); | |
5534 | if (t) | |
5535 | return t; | |
5536 | else | |
5537 | return and_comparisons_1 (code2, op2a, op2b, code1, op1a, op1b); | |
5538 | } | |
5539 | ||
5540 | /* Helper function for or_comparisons_1: try to simplify the OR of the | |
5541 | ssa variable VAR with the comparison specified by (OP2A CODE2 OP2B). | |
5542 | If INVERT is true, invert the value of VAR before doing the OR. | |
5543 | Return NULL_EXPR if we can't simplify this to a single expression. */ | |
5544 | ||
5545 | static tree | |
5546 | or_var_with_comparison (tree var, bool invert, | |
5547 | enum tree_code code2, tree op2a, tree op2b) | |
5548 | { | |
5549 | tree t; | |
355fe088 | 5550 | gimple *stmt = SSA_NAME_DEF_STMT (var); |
e89065a1 SL |
5551 | |
5552 | /* We can only deal with variables whose definitions are assignments. */ | |
5553 | if (!is_gimple_assign (stmt)) | |
5554 | return NULL_TREE; | |
5555 | ||
5556 | /* If we have an inverted comparison, apply DeMorgan's law and rewrite | |
5557 | !var OR (op2a code2 op2b) => !(var AND !(op2a code2 op2b)) | |
5558 | Then we only have to consider the simpler non-inverted cases. */ | |
5559 | if (invert) | |
5560 | t = and_var_with_comparison_1 (stmt, | |
5561 | invert_tree_comparison (code2, false), | |
5562 | op2a, op2b); | |
5563 | else | |
5564 | t = or_var_with_comparison_1 (stmt, code2, op2a, op2b); | |
5565 | return canonicalize_bool (t, invert); | |
5566 | } | |
5567 | ||
5568 | /* Try to simplify the OR of the ssa variable defined by the assignment | |
5569 | STMT with the comparison specified by (OP2A CODE2 OP2B). | |
5570 | Return NULL_EXPR if we can't simplify this to a single expression. */ | |
5571 | ||
5572 | static tree | |
355fe088 | 5573 | or_var_with_comparison_1 (gimple *stmt, |
e89065a1 SL |
5574 | enum tree_code code2, tree op2a, tree op2b) |
5575 | { | |
5576 | tree var = gimple_assign_lhs (stmt); | |
5577 | tree true_test_var = NULL_TREE; | |
5578 | tree false_test_var = NULL_TREE; | |
5579 | enum tree_code innercode = gimple_assign_rhs_code (stmt); | |
5580 | ||
5581 | /* Check for identities like (var OR (var != 0)) => true . */ | |
5582 | if (TREE_CODE (op2a) == SSA_NAME | |
5583 | && TREE_CODE (TREE_TYPE (var)) == BOOLEAN_TYPE) | |
5584 | { | |
5585 | if ((code2 == NE_EXPR && integer_zerop (op2b)) | |
5586 | || (code2 == EQ_EXPR && integer_nonzerop (op2b))) | |
5587 | { | |
5588 | true_test_var = op2a; | |
5589 | if (var == true_test_var) | |
5590 | return var; | |
5591 | } | |
5592 | else if ((code2 == EQ_EXPR && integer_zerop (op2b)) | |
5593 | || (code2 == NE_EXPR && integer_nonzerop (op2b))) | |
5594 | { | |
5595 | false_test_var = op2a; | |
5596 | if (var == false_test_var) | |
5597 | return boolean_true_node; | |
5598 | } | |
5599 | } | |
5600 | ||
5601 | /* If the definition is a comparison, recurse on it. */ | |
5602 | if (TREE_CODE_CLASS (innercode) == tcc_comparison) | |
5603 | { | |
5604 | tree t = or_comparisons_1 (innercode, | |
5605 | gimple_assign_rhs1 (stmt), | |
5606 | gimple_assign_rhs2 (stmt), | |
5607 | code2, | |
5608 | op2a, | |
5609 | op2b); | |
5610 | if (t) | |
5611 | return t; | |
5612 | } | |
5613 | ||
5614 | /* If the definition is an AND or OR expression, we may be able to | |
5615 | simplify by reassociating. */ | |
eb9820c0 KT |
5616 | if (TREE_CODE (TREE_TYPE (var)) == BOOLEAN_TYPE |
5617 | && (innercode == BIT_AND_EXPR || innercode == BIT_IOR_EXPR)) | |
e89065a1 SL |
5618 | { |
5619 | tree inner1 = gimple_assign_rhs1 (stmt); | |
5620 | tree inner2 = gimple_assign_rhs2 (stmt); | |
355fe088 | 5621 | gimple *s; |
e89065a1 SL |
5622 | tree t; |
5623 | tree partial = NULL_TREE; | |
eb9820c0 | 5624 | bool is_or = (innercode == BIT_IOR_EXPR); |
e89065a1 SL |
5625 | |
5626 | /* Check for boolean identities that don't require recursive examination | |
5627 | of inner1/inner2: | |
5628 | inner1 OR (inner1 OR inner2) => inner1 OR inner2 => var | |
5629 | inner1 OR (inner1 AND inner2) => inner1 | |
5630 | !inner1 OR (inner1 OR inner2) => true | |
5631 | !inner1 OR (inner1 AND inner2) => !inner1 OR inner2 | |
5632 | */ | |
5633 | if (inner1 == true_test_var) | |
5634 | return (is_or ? var : inner1); | |
5635 | else if (inner2 == true_test_var) | |
5636 | return (is_or ? var : inner2); | |
5637 | else if (inner1 == false_test_var) | |
5638 | return (is_or | |
5639 | ? boolean_true_node | |
5640 | : or_var_with_comparison (inner2, false, code2, op2a, op2b)); | |
5641 | else if (inner2 == false_test_var) | |
5642 | return (is_or | |
5643 | ? boolean_true_node | |
5644 | : or_var_with_comparison (inner1, false, code2, op2a, op2b)); | |
5645 | ||
5646 | /* Next, redistribute/reassociate the OR across the inner tests. | |
5647 | Compute the first partial result, (inner1 OR (op2a code op2b)) */ | |
5648 | if (TREE_CODE (inner1) == SSA_NAME | |
5649 | && is_gimple_assign (s = SSA_NAME_DEF_STMT (inner1)) | |
5650 | && TREE_CODE_CLASS (gimple_assign_rhs_code (s)) == tcc_comparison | |
5651 | && (t = maybe_fold_or_comparisons (gimple_assign_rhs_code (s), | |
5652 | gimple_assign_rhs1 (s), | |
5653 | gimple_assign_rhs2 (s), | |
5654 | code2, op2a, op2b))) | |
5655 | { | |
5656 | /* Handle the OR case, where we are reassociating: | |
5657 | (inner1 OR inner2) OR (op2a code2 op2b) | |
5658 | => (t OR inner2) | |
5659 | If the partial result t is a constant, we win. Otherwise | |
5660 | continue on to try reassociating with the other inner test. */ | |
8236c8eb | 5661 | if (is_or) |
e89065a1 SL |
5662 | { |
5663 | if (integer_onep (t)) | |
5664 | return boolean_true_node; | |
5665 | else if (integer_zerop (t)) | |
5666 | return inner2; | |
5667 | } | |
5668 | ||
5669 | /* Handle the AND case, where we are redistributing: | |
5670 | (inner1 AND inner2) OR (op2a code2 op2b) | |
5671 | => (t AND (inner2 OR (op2a code op2b))) */ | |
8236c8eb JJ |
5672 | else if (integer_zerop (t)) |
5673 | return boolean_false_node; | |
5674 | ||
5675 | /* Save partial result for later. */ | |
5676 | partial = t; | |
e89065a1 SL |
5677 | } |
5678 | ||
5679 | /* Compute the second partial result, (inner2 OR (op2a code op2b)) */ | |
5680 | if (TREE_CODE (inner2) == SSA_NAME | |
5681 | && is_gimple_assign (s = SSA_NAME_DEF_STMT (inner2)) | |
5682 | && TREE_CODE_CLASS (gimple_assign_rhs_code (s)) == tcc_comparison | |
5683 | && (t = maybe_fold_or_comparisons (gimple_assign_rhs_code (s), | |
5684 | gimple_assign_rhs1 (s), | |
5685 | gimple_assign_rhs2 (s), | |
5686 | code2, op2a, op2b))) | |
5687 | { | |
5688 | /* Handle the OR case, where we are reassociating: | |
5689 | (inner1 OR inner2) OR (op2a code2 op2b) | |
8236c8eb JJ |
5690 | => (inner1 OR t) |
5691 | => (t OR partial) */ | |
5692 | if (is_or) | |
e89065a1 SL |
5693 | { |
5694 | if (integer_zerop (t)) | |
5695 | return inner1; | |
5696 | else if (integer_onep (t)) | |
5697 | return boolean_true_node; | |
8236c8eb JJ |
5698 | /* If both are the same, we can apply the identity |
5699 | (x OR x) == x. */ | |
5700 | else if (partial && same_bool_result_p (t, partial)) | |
5701 | return t; | |
e89065a1 SL |
5702 | } |
5703 | ||
5704 | /* Handle the AND case, where we are redistributing: | |
5705 | (inner1 AND inner2) OR (op2a code2 op2b) | |
5706 | => (t AND (inner1 OR (op2a code2 op2b))) | |
5707 | => (t AND partial) */ | |
5708 | else | |
5709 | { | |
5710 | if (integer_zerop (t)) | |
5711 | return boolean_false_node; | |
5712 | else if (partial) | |
5713 | { | |
5714 | /* We already got a simplification for the other | |
5715 | operand to the redistributed AND expression. The | |
5716 | interesting case is when at least one is true. | |
5717 | Or, if both are the same, we can apply the identity | |
8236c8eb | 5718 | (x AND x) == x. */ |
e89065a1 SL |
5719 | if (integer_onep (partial)) |
5720 | return t; | |
5721 | else if (integer_onep (t)) | |
5722 | return partial; | |
5723 | else if (same_bool_result_p (t, partial)) | |
8236c8eb | 5724 | return t; |
e89065a1 SL |
5725 | } |
5726 | } | |
5727 | } | |
5728 | } | |
5729 | return NULL_TREE; | |
5730 | } | |
5731 | ||
5732 | /* Try to simplify the OR of two comparisons defined by | |
5733 | (OP1A CODE1 OP1B) and (OP2A CODE2 OP2B), respectively. | |
5734 | If this can be done without constructing an intermediate value, | |
5735 | return the resulting tree; otherwise NULL_TREE is returned. | |
5736 | This function is deliberately asymmetric as it recurses on SSA_DEFs | |
5737 | in the first comparison but not the second. */ | |
5738 | ||
5739 | static tree | |
5740 | or_comparisons_1 (enum tree_code code1, tree op1a, tree op1b, | |
5741 | enum tree_code code2, tree op2a, tree op2b) | |
5742 | { | |
ae22ac3c | 5743 | tree truth_type = truth_type_for (TREE_TYPE (op1a)); |
31ed6226 | 5744 | |
e89065a1 SL |
5745 | /* First check for ((x CODE1 y) OR (x CODE2 y)). */ |
5746 | if (operand_equal_p (op1a, op2a, 0) | |
5747 | && operand_equal_p (op1b, op2b, 0)) | |
5748 | { | |
eb9820c0 | 5749 | /* Result will be either NULL_TREE, or a combined comparison. */ |
e89065a1 SL |
5750 | tree t = combine_comparisons (UNKNOWN_LOCATION, |
5751 | TRUTH_ORIF_EXPR, code1, code2, | |
31ed6226 | 5752 | truth_type, op1a, op1b); |
e89065a1 SL |
5753 | if (t) |
5754 | return t; | |
5755 | } | |
5756 | ||
5757 | /* Likewise the swapped case of the above. */ | |
5758 | if (operand_equal_p (op1a, op2b, 0) | |
5759 | && operand_equal_p (op1b, op2a, 0)) | |
5760 | { | |
eb9820c0 | 5761 | /* Result will be either NULL_TREE, or a combined comparison. */ |
e89065a1 SL |
5762 | tree t = combine_comparisons (UNKNOWN_LOCATION, |
5763 | TRUTH_ORIF_EXPR, code1, | |
5764 | swap_tree_comparison (code2), | |
31ed6226 | 5765 | truth_type, op1a, op1b); |
e89065a1 SL |
5766 | if (t) |
5767 | return t; | |
5768 | } | |
5769 | ||
5770 | /* If both comparisons are of the same value against constants, we might | |
5771 | be able to merge them. */ | |
5772 | if (operand_equal_p (op1a, op2a, 0) | |
5773 | && TREE_CODE (op1b) == INTEGER_CST | |
5774 | && TREE_CODE (op2b) == INTEGER_CST) | |
5775 | { | |
5776 | int cmp = tree_int_cst_compare (op1b, op2b); | |
5777 | ||
5778 | /* If we have (op1a != op1b), we should either be able to | |
5779 | return that or TRUE, depending on whether the constant op1b | |
5780 | also satisfies the other comparison against op2b. */ | |
5781 | if (code1 == NE_EXPR) | |
5782 | { | |
5783 | bool done = true; | |
5784 | bool val; | |
5785 | switch (code2) | |
5786 | { | |
5787 | case EQ_EXPR: val = (cmp == 0); break; | |
5788 | case NE_EXPR: val = (cmp != 0); break; | |
5789 | case LT_EXPR: val = (cmp < 0); break; | |
5790 | case GT_EXPR: val = (cmp > 0); break; | |
5791 | case LE_EXPR: val = (cmp <= 0); break; | |
5792 | case GE_EXPR: val = (cmp >= 0); break; | |
5793 | default: done = false; | |
5794 | } | |
5795 | if (done) | |
5796 | { | |
5797 | if (val) | |
5798 | return boolean_true_node; | |
5799 | else | |
5800 | return fold_build2 (code1, boolean_type_node, op1a, op1b); | |
5801 | } | |
5802 | } | |
5803 | /* Likewise if the second comparison is a != comparison. */ | |
5804 | else if (code2 == NE_EXPR) | |
5805 | { | |
5806 | bool done = true; | |
5807 | bool val; | |
5808 | switch (code1) | |
5809 | { | |
5810 | case EQ_EXPR: val = (cmp == 0); break; | |
5811 | case NE_EXPR: val = (cmp != 0); break; | |
5812 | case LT_EXPR: val = (cmp > 0); break; | |
5813 | case GT_EXPR: val = (cmp < 0); break; | |
5814 | case LE_EXPR: val = (cmp >= 0); break; | |
5815 | case GE_EXPR: val = (cmp <= 0); break; | |
5816 | default: done = false; | |
5817 | } | |
5818 | if (done) | |
5819 | { | |
5820 | if (val) | |
5821 | return boolean_true_node; | |
5822 | else | |
5823 | return fold_build2 (code2, boolean_type_node, op2a, op2b); | |
5824 | } | |
5825 | } | |
5826 | ||
5827 | /* See if an equality test is redundant with the other comparison. */ | |
5828 | else if (code1 == EQ_EXPR) | |
5829 | { | |
5830 | bool val; | |
5831 | switch (code2) | |
5832 | { | |
5833 | case EQ_EXPR: val = (cmp == 0); break; | |
5834 | case NE_EXPR: val = (cmp != 0); break; | |
5835 | case LT_EXPR: val = (cmp < 0); break; | |
5836 | case GT_EXPR: val = (cmp > 0); break; | |
5837 | case LE_EXPR: val = (cmp <= 0); break; | |
5838 | case GE_EXPR: val = (cmp >= 0); break; | |
5839 | default: | |
5840 | val = false; | |
5841 | } | |
5842 | if (val) | |
5843 | return fold_build2 (code2, boolean_type_node, op2a, op2b); | |
5844 | } | |
5845 | else if (code2 == EQ_EXPR) | |
5846 | { | |
5847 | bool val; | |
5848 | switch (code1) | |
5849 | { | |
5850 | case EQ_EXPR: val = (cmp == 0); break; | |
5851 | case NE_EXPR: val = (cmp != 0); break; | |
5852 | case LT_EXPR: val = (cmp > 0); break; | |
5853 | case GT_EXPR: val = (cmp < 0); break; | |
5854 | case LE_EXPR: val = (cmp >= 0); break; | |
5855 | case GE_EXPR: val = (cmp <= 0); break; | |
5856 | default: | |
5857 | val = false; | |
5858 | } | |
5859 | if (val) | |
5860 | return fold_build2 (code1, boolean_type_node, op1a, op1b); | |
5861 | } | |
5862 | ||
5863 | /* Chose the less restrictive of two < or <= comparisons. */ | |
5864 | else if ((code1 == LT_EXPR || code1 == LE_EXPR) | |
5865 | && (code2 == LT_EXPR || code2 == LE_EXPR)) | |
5866 | { | |
5867 | if ((cmp < 0) || (cmp == 0 && code1 == LT_EXPR)) | |
5868 | return fold_build2 (code2, boolean_type_node, op2a, op2b); | |
5869 | else | |
5870 | return fold_build2 (code1, boolean_type_node, op1a, op1b); | |
5871 | } | |
5872 | ||
5873 | /* Likewise chose the less restrictive of two > or >= comparisons. */ | |
5874 | else if ((code1 == GT_EXPR || code1 == GE_EXPR) | |
5875 | && (code2 == GT_EXPR || code2 == GE_EXPR)) | |
5876 | { | |
5877 | if ((cmp > 0) || (cmp == 0 && code1 == GT_EXPR)) | |
5878 | return fold_build2 (code2, boolean_type_node, op2a, op2b); | |
5879 | else | |
5880 | return fold_build2 (code1, boolean_type_node, op1a, op1b); | |
5881 | } | |
5882 | ||
5883 | /* Check for singleton ranges. */ | |
5884 | else if (cmp == 0 | |
5885 | && ((code1 == LT_EXPR && code2 == GT_EXPR) | |
5886 | || (code1 == GT_EXPR && code2 == LT_EXPR))) | |
5887 | return fold_build2 (NE_EXPR, boolean_type_node, op1a, op2b); | |
5888 | ||
5889 | /* Check for less/greater pairs that don't restrict the range at all. */ | |
5890 | else if (cmp >= 0 | |
5891 | && (code1 == LT_EXPR || code1 == LE_EXPR) | |
5892 | && (code2 == GT_EXPR || code2 == GE_EXPR)) | |
5893 | return boolean_true_node; | |
5894 | else if (cmp <= 0 | |
5895 | && (code1 == GT_EXPR || code1 == GE_EXPR) | |
5896 | && (code2 == LT_EXPR || code2 == LE_EXPR)) | |
5897 | return boolean_true_node; | |
5898 | } | |
5899 | ||
5900 | /* Perhaps the first comparison is (NAME != 0) or (NAME == 1) where | |
5901 | NAME's definition is a truth value. See if there are any simplifications | |
5902 | that can be done against the NAME's definition. */ | |
5903 | if (TREE_CODE (op1a) == SSA_NAME | |
5904 | && (code1 == NE_EXPR || code1 == EQ_EXPR) | |
5905 | && (integer_zerop (op1b) || integer_onep (op1b))) | |
5906 | { | |
5907 | bool invert = ((code1 == EQ_EXPR && integer_zerop (op1b)) | |
5908 | || (code1 == NE_EXPR && integer_onep (op1b))); | |
355fe088 | 5909 | gimple *stmt = SSA_NAME_DEF_STMT (op1a); |
e89065a1 SL |
5910 | switch (gimple_code (stmt)) |
5911 | { | |
5912 | case GIMPLE_ASSIGN: | |
5913 | /* Try to simplify by copy-propagating the definition. */ | |
5914 | return or_var_with_comparison (op1a, invert, code2, op2a, op2b); | |
5915 | ||
5916 | case GIMPLE_PHI: | |
5917 | /* If every argument to the PHI produces the same result when | |
5918 | ORed with the second comparison, we win. | |
5919 | Do not do this unless the type is bool since we need a bool | |
5920 | result here anyway. */ | |
5921 | if (TREE_CODE (TREE_TYPE (op1a)) == BOOLEAN_TYPE) | |
5922 | { | |
5923 | tree result = NULL_TREE; | |
5924 | unsigned i; | |
5925 | for (i = 0; i < gimple_phi_num_args (stmt); i++) | |
5926 | { | |
5927 | tree arg = gimple_phi_arg_def (stmt, i); | |
5928 | ||
5929 | /* If this PHI has itself as an argument, ignore it. | |
5930 | If all the other args produce the same result, | |
5931 | we're still OK. */ | |
5932 | if (arg == gimple_phi_result (stmt)) | |
5933 | continue; | |
5934 | else if (TREE_CODE (arg) == INTEGER_CST) | |
5935 | { | |
5936 | if (invert ? integer_zerop (arg) : integer_nonzerop (arg)) | |
5937 | { | |
5938 | if (!result) | |
5939 | result = boolean_true_node; | |
5940 | else if (!integer_onep (result)) | |
5941 | return NULL_TREE; | |
5942 | } | |
5943 | else if (!result) | |
5944 | result = fold_build2 (code2, boolean_type_node, | |
5945 | op2a, op2b); | |
5946 | else if (!same_bool_comparison_p (result, | |
5947 | code2, op2a, op2b)) | |
5948 | return NULL_TREE; | |
5949 | } | |
0e8b84ec JJ |
5950 | else if (TREE_CODE (arg) == SSA_NAME |
5951 | && !SSA_NAME_IS_DEFAULT_DEF (arg)) | |
e89065a1 | 5952 | { |
6c66f733 | 5953 | tree temp; |
355fe088 | 5954 | gimple *def_stmt = SSA_NAME_DEF_STMT (arg); |
6c66f733 JJ |
5955 | /* In simple cases we can look through PHI nodes, |
5956 | but we have to be careful with loops. | |
5957 | See PR49073. */ | |
5958 | if (! dom_info_available_p (CDI_DOMINATORS) | |
5959 | || gimple_bb (def_stmt) == gimple_bb (stmt) | |
5960 | || dominated_by_p (CDI_DOMINATORS, | |
5961 | gimple_bb (def_stmt), | |
5962 | gimple_bb (stmt))) | |
5963 | return NULL_TREE; | |
5964 | temp = or_var_with_comparison (arg, invert, code2, | |
5965 | op2a, op2b); | |
e89065a1 SL |
5966 | if (!temp) |
5967 | return NULL_TREE; | |
5968 | else if (!result) | |
5969 | result = temp; | |
5970 | else if (!same_bool_result_p (result, temp)) | |
5971 | return NULL_TREE; | |
5972 | } | |
5973 | else | |
5974 | return NULL_TREE; | |
5975 | } | |
5976 | return result; | |
5977 | } | |
5978 | ||
5979 | default: | |
5980 | break; | |
5981 | } | |
5982 | } | |
5983 | return NULL_TREE; | |
5984 | } | |
5985 | ||
5986 | /* Try to simplify the OR of two comparisons, specified by | |
5987 | (OP1A CODE1 OP1B) and (OP2B CODE2 OP2B), respectively. | |
5988 | If this can be simplified to a single expression (without requiring | |
5989 | introducing more SSA variables to hold intermediate values), | |
5990 | return the resulting tree. Otherwise return NULL_TREE. | |
5991 | If the result expression is non-null, it has boolean type. */ | |
5992 | ||
5993 | tree | |
5994 | maybe_fold_or_comparisons (enum tree_code code1, tree op1a, tree op1b, | |
5995 | enum tree_code code2, tree op2a, tree op2b) | |
5996 | { | |
5997 | tree t = or_comparisons_1 (code1, op1a, op1b, code2, op2a, op2b); | |
5998 | if (t) | |
5999 | return t; | |
6000 | else | |
6001 | return or_comparisons_1 (code2, op2a, op2b, code1, op1a, op1b); | |
6002 | } | |
cfef45c8 RG |
6003 | |
6004 | ||
6005 | /* Fold STMT to a constant using VALUEIZE to valueize SSA names. | |
6006 | ||
6007 | Either NULL_TREE, a simplified but non-constant or a constant | |
6008 | is returned. | |
6009 | ||
6010 | ??? This should go into a gimple-fold-inline.h file to be eventually | |
6011 | privatized with the single valueize function used in the various TUs | |
6012 | to avoid the indirect function call overhead. */ | |
6013 | ||
6014 | tree | |
355fe088 | 6015 | gimple_fold_stmt_to_constant_1 (gimple *stmt, tree (*valueize) (tree), |
d2a85801 | 6016 | tree (*gvalueize) (tree)) |
cfef45c8 | 6017 | { |
45cc9f96 RB |
6018 | code_helper rcode; |
6019 | tree ops[3] = {}; | |
6020 | /* ??? The SSA propagators do not correctly deal with following SSA use-def | |
6021 | edges if there are intermediate VARYING defs. For this reason | |
6022 | do not follow SSA edges here even though SCCVN can technically | |
6023 | just deal fine with that. */ | |
34050b6b | 6024 | if (gimple_simplify (stmt, &rcode, ops, NULL, gvalueize, valueize)) |
45cc9f96 | 6025 | { |
34050b6b | 6026 | tree res = NULL_TREE; |
c0f62740 | 6027 | if (gimple_simplified_result_is_gimple_val (rcode, ops)) |
34050b6b RB |
6028 | res = ops[0]; |
6029 | else if (mprts_hook) | |
6030 | res = mprts_hook (rcode, gimple_expr_type (stmt), ops); | |
6031 | if (res) | |
45cc9f96 | 6032 | { |
34050b6b RB |
6033 | if (dump_file && dump_flags & TDF_DETAILS) |
6034 | { | |
6035 | fprintf (dump_file, "Match-and-simplified "); | |
6036 | print_gimple_expr (dump_file, stmt, 0, TDF_SLIM); | |
6037 | fprintf (dump_file, " to "); | |
ef6cb4c7 | 6038 | print_generic_expr (dump_file, res); |
34050b6b RB |
6039 | fprintf (dump_file, "\n"); |
6040 | } | |
6041 | return res; | |
45cc9f96 | 6042 | } |
45cc9f96 RB |
6043 | } |
6044 | ||
cfef45c8 RG |
6045 | location_t loc = gimple_location (stmt); |
6046 | switch (gimple_code (stmt)) | |
6047 | { | |
6048 | case GIMPLE_ASSIGN: | |
6049 | { | |
6050 | enum tree_code subcode = gimple_assign_rhs_code (stmt); | |
6051 | ||
6052 | switch (get_gimple_rhs_class (subcode)) | |
6053 | { | |
6054 | case GIMPLE_SINGLE_RHS: | |
6055 | { | |
6056 | tree rhs = gimple_assign_rhs1 (stmt); | |
6057 | enum tree_code_class kind = TREE_CODE_CLASS (subcode); | |
6058 | ||
6059 | if (TREE_CODE (rhs) == SSA_NAME) | |
6060 | { | |
6061 | /* If the RHS is an SSA_NAME, return its known constant value, | |
6062 | if any. */ | |
6063 | return (*valueize) (rhs); | |
6064 | } | |
6065 | /* Handle propagating invariant addresses into address | |
6066 | operations. */ | |
6067 | else if (TREE_CODE (rhs) == ADDR_EXPR | |
6068 | && !is_gimple_min_invariant (rhs)) | |
6069 | { | |
a90c8804 | 6070 | poly_int64 offset = 0; |
cfef45c8 RG |
6071 | tree base; |
6072 | base = get_addr_base_and_unit_offset_1 (TREE_OPERAND (rhs, 0), | |
6073 | &offset, | |
6074 | valueize); | |
6075 | if (base | |
6076 | && (CONSTANT_CLASS_P (base) | |
6077 | || decl_address_invariant_p (base))) | |
6078 | return build_invariant_address (TREE_TYPE (rhs), | |
6079 | base, offset); | |
6080 | } | |
6081 | else if (TREE_CODE (rhs) == CONSTRUCTOR | |
6082 | && TREE_CODE (TREE_TYPE (rhs)) == VECTOR_TYPE | |
928686b1 RS |
6083 | && known_eq (CONSTRUCTOR_NELTS (rhs), |
6084 | TYPE_VECTOR_SUBPARTS (TREE_TYPE (rhs)))) | |
cfef45c8 | 6085 | { |
794e3180 RS |
6086 | unsigned i, nelts; |
6087 | tree val; | |
cfef45c8 | 6088 | |
928686b1 | 6089 | nelts = CONSTRUCTOR_NELTS (rhs); |
5ebaa477 | 6090 | tree_vector_builder vec (TREE_TYPE (rhs), nelts, 1); |
cfef45c8 RG |
6091 | FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (rhs), i, val) |
6092 | { | |
6093 | val = (*valueize) (val); | |
6094 | if (TREE_CODE (val) == INTEGER_CST | |
6095 | || TREE_CODE (val) == REAL_CST | |
6096 | || TREE_CODE (val) == FIXED_CST) | |
794e3180 | 6097 | vec.quick_push (val); |
cfef45c8 RG |
6098 | else |
6099 | return NULL_TREE; | |
6100 | } | |
6101 | ||
5ebaa477 | 6102 | return vec.build (); |
cfef45c8 | 6103 | } |
bdf37f7a JH |
6104 | if (subcode == OBJ_TYPE_REF) |
6105 | { | |
6106 | tree val = (*valueize) (OBJ_TYPE_REF_EXPR (rhs)); | |
6107 | /* If callee is constant, we can fold away the wrapper. */ | |
6108 | if (is_gimple_min_invariant (val)) | |
6109 | return val; | |
6110 | } | |
cfef45c8 RG |
6111 | |
6112 | if (kind == tcc_reference) | |
6113 | { | |
6114 | if ((TREE_CODE (rhs) == VIEW_CONVERT_EXPR | |
6115 | || TREE_CODE (rhs) == REALPART_EXPR | |
6116 | || TREE_CODE (rhs) == IMAGPART_EXPR) | |
6117 | && TREE_CODE (TREE_OPERAND (rhs, 0)) == SSA_NAME) | |
6118 | { | |
6119 | tree val = (*valueize) (TREE_OPERAND (rhs, 0)); | |
6120 | return fold_unary_loc (EXPR_LOCATION (rhs), | |
6121 | TREE_CODE (rhs), | |
6122 | TREE_TYPE (rhs), val); | |
6123 | } | |
6124 | else if (TREE_CODE (rhs) == BIT_FIELD_REF | |
6125 | && TREE_CODE (TREE_OPERAND (rhs, 0)) == SSA_NAME) | |
6126 | { | |
6127 | tree val = (*valueize) (TREE_OPERAND (rhs, 0)); | |
6128 | return fold_ternary_loc (EXPR_LOCATION (rhs), | |
6129 | TREE_CODE (rhs), | |
6130 | TREE_TYPE (rhs), val, | |
6131 | TREE_OPERAND (rhs, 1), | |
6132 | TREE_OPERAND (rhs, 2)); | |
6133 | } | |
6134 | else if (TREE_CODE (rhs) == MEM_REF | |
6135 | && TREE_CODE (TREE_OPERAND (rhs, 0)) == SSA_NAME) | |
6136 | { | |
6137 | tree val = (*valueize) (TREE_OPERAND (rhs, 0)); | |
6138 | if (TREE_CODE (val) == ADDR_EXPR | |
6139 | && is_gimple_min_invariant (val)) | |
6140 | { | |
6141 | tree tem = fold_build2 (MEM_REF, TREE_TYPE (rhs), | |
6142 | unshare_expr (val), | |
6143 | TREE_OPERAND (rhs, 1)); | |
6144 | if (tem) | |
6145 | rhs = tem; | |
6146 | } | |
6147 | } | |
6148 | return fold_const_aggregate_ref_1 (rhs, valueize); | |
6149 | } | |
6150 | else if (kind == tcc_declaration) | |
6151 | return get_symbol_constant_value (rhs); | |
6152 | return rhs; | |
6153 | } | |
6154 | ||
6155 | case GIMPLE_UNARY_RHS: | |
f3582e54 | 6156 | return NULL_TREE; |
cfef45c8 RG |
6157 | |
6158 | case GIMPLE_BINARY_RHS: | |
4b1b9e64 RB |
6159 | /* Translate &x + CST into an invariant form suitable for |
6160 | further propagation. */ | |
6161 | if (subcode == POINTER_PLUS_EXPR) | |
6162 | { | |
4b1b9e64 RB |
6163 | tree op0 = (*valueize) (gimple_assign_rhs1 (stmt)); |
6164 | tree op1 = (*valueize) (gimple_assign_rhs2 (stmt)); | |
4b1b9e64 RB |
6165 | if (TREE_CODE (op0) == ADDR_EXPR |
6166 | && TREE_CODE (op1) == INTEGER_CST) | |
6167 | { | |
6168 | tree off = fold_convert (ptr_type_node, op1); | |
6169 | return build_fold_addr_expr_loc | |
6170 | (loc, | |
6171 | fold_build2 (MEM_REF, | |
6172 | TREE_TYPE (TREE_TYPE (op0)), | |
6173 | unshare_expr (op0), off)); | |
6174 | } | |
6175 | } | |
59c20dc7 RB |
6176 | /* Canonicalize bool != 0 and bool == 0 appearing after |
6177 | valueization. While gimple_simplify handles this | |
6178 | it can get confused by the ~X == 1 -> X == 0 transform | |
6179 | which we cant reduce to a SSA name or a constant | |
6180 | (and we have no way to tell gimple_simplify to not | |
6181 | consider those transforms in the first place). */ | |
6182 | else if (subcode == EQ_EXPR | |
6183 | || subcode == NE_EXPR) | |
6184 | { | |
6185 | tree lhs = gimple_assign_lhs (stmt); | |
6186 | tree op0 = gimple_assign_rhs1 (stmt); | |
6187 | if (useless_type_conversion_p (TREE_TYPE (lhs), | |
6188 | TREE_TYPE (op0))) | |
6189 | { | |
6190 | tree op1 = (*valueize) (gimple_assign_rhs2 (stmt)); | |
6191 | op0 = (*valueize) (op0); | |
8861704d RB |
6192 | if (TREE_CODE (op0) == INTEGER_CST) |
6193 | std::swap (op0, op1); | |
6194 | if (TREE_CODE (op1) == INTEGER_CST | |
6195 | && ((subcode == NE_EXPR && integer_zerop (op1)) | |
6196 | || (subcode == EQ_EXPR && integer_onep (op1)))) | |
6197 | return op0; | |
59c20dc7 RB |
6198 | } |
6199 | } | |
4b1b9e64 | 6200 | return NULL_TREE; |
cfef45c8 RG |
6201 | |
6202 | case GIMPLE_TERNARY_RHS: | |
6203 | { | |
6204 | /* Handle ternary operators that can appear in GIMPLE form. */ | |
6205 | tree op0 = (*valueize) (gimple_assign_rhs1 (stmt)); | |
6206 | tree op1 = (*valueize) (gimple_assign_rhs2 (stmt)); | |
6207 | tree op2 = (*valueize) (gimple_assign_rhs3 (stmt)); | |
cfef45c8 RG |
6208 | return fold_ternary_loc (loc, subcode, |
6209 | gimple_expr_type (stmt), op0, op1, op2); | |
6210 | } | |
6211 | ||
6212 | default: | |
6213 | gcc_unreachable (); | |
6214 | } | |
6215 | } | |
6216 | ||
6217 | case GIMPLE_CALL: | |
6218 | { | |
25583c4f | 6219 | tree fn; |
538dd0b7 | 6220 | gcall *call_stmt = as_a <gcall *> (stmt); |
25583c4f RS |
6221 | |
6222 | if (gimple_call_internal_p (stmt)) | |
31e071ae MP |
6223 | { |
6224 | enum tree_code subcode = ERROR_MARK; | |
6225 | switch (gimple_call_internal_fn (stmt)) | |
6226 | { | |
6227 | case IFN_UBSAN_CHECK_ADD: | |
6228 | subcode = PLUS_EXPR; | |
6229 | break; | |
6230 | case IFN_UBSAN_CHECK_SUB: | |
6231 | subcode = MINUS_EXPR; | |
6232 | break; | |
6233 | case IFN_UBSAN_CHECK_MUL: | |
6234 | subcode = MULT_EXPR; | |
6235 | break; | |
68fa96d6 ML |
6236 | case IFN_BUILTIN_EXPECT: |
6237 | { | |
6238 | tree arg0 = gimple_call_arg (stmt, 0); | |
6239 | tree op0 = (*valueize) (arg0); | |
6240 | if (TREE_CODE (op0) == INTEGER_CST) | |
6241 | return op0; | |
6242 | return NULL_TREE; | |
6243 | } | |
31e071ae MP |
6244 | default: |
6245 | return NULL_TREE; | |
6246 | } | |
368b454d JJ |
6247 | tree arg0 = gimple_call_arg (stmt, 0); |
6248 | tree arg1 = gimple_call_arg (stmt, 1); | |
6249 | tree op0 = (*valueize) (arg0); | |
6250 | tree op1 = (*valueize) (arg1); | |
31e071ae MP |
6251 | |
6252 | if (TREE_CODE (op0) != INTEGER_CST | |
6253 | || TREE_CODE (op1) != INTEGER_CST) | |
368b454d JJ |
6254 | { |
6255 | switch (subcode) | |
6256 | { | |
6257 | case MULT_EXPR: | |
6258 | /* x * 0 = 0 * x = 0 without overflow. */ | |
6259 | if (integer_zerop (op0) || integer_zerop (op1)) | |
6260 | return build_zero_cst (TREE_TYPE (arg0)); | |
6261 | break; | |
6262 | case MINUS_EXPR: | |
6263 | /* y - y = 0 without overflow. */ | |
6264 | if (operand_equal_p (op0, op1, 0)) | |
6265 | return build_zero_cst (TREE_TYPE (arg0)); | |
6266 | break; | |
6267 | default: | |
6268 | break; | |
6269 | } | |
6270 | } | |
6271 | tree res | |
6272 | = fold_binary_loc (loc, subcode, TREE_TYPE (arg0), op0, op1); | |
31e071ae MP |
6273 | if (res |
6274 | && TREE_CODE (res) == INTEGER_CST | |
6275 | && !TREE_OVERFLOW (res)) | |
6276 | return res; | |
6277 | return NULL_TREE; | |
6278 | } | |
25583c4f RS |
6279 | |
6280 | fn = (*valueize) (gimple_call_fn (stmt)); | |
cfef45c8 RG |
6281 | if (TREE_CODE (fn) == ADDR_EXPR |
6282 | && TREE_CODE (TREE_OPERAND (fn, 0)) == FUNCTION_DECL | |
5c944c6c RB |
6283 | && DECL_BUILT_IN (TREE_OPERAND (fn, 0)) |
6284 | && gimple_builtin_call_types_compatible_p (stmt, | |
6285 | TREE_OPERAND (fn, 0))) | |
cfef45c8 RG |
6286 | { |
6287 | tree *args = XALLOCAVEC (tree, gimple_call_num_args (stmt)); | |
a6a0570f | 6288 | tree retval; |
cfef45c8 RG |
6289 | unsigned i; |
6290 | for (i = 0; i < gimple_call_num_args (stmt); ++i) | |
6291 | args[i] = (*valueize) (gimple_call_arg (stmt, i)); | |
a6a0570f | 6292 | retval = fold_builtin_call_array (loc, |
538dd0b7 | 6293 | gimple_call_return_type (call_stmt), |
cfef45c8 | 6294 | fn, gimple_call_num_args (stmt), args); |
cfef45c8 | 6295 | if (retval) |
5c944c6c RB |
6296 | { |
6297 | /* fold_call_expr wraps the result inside a NOP_EXPR. */ | |
6298 | STRIP_NOPS (retval); | |
538dd0b7 DM |
6299 | retval = fold_convert (gimple_call_return_type (call_stmt), |
6300 | retval); | |
5c944c6c | 6301 | } |
cfef45c8 RG |
6302 | return retval; |
6303 | } | |
6304 | return NULL_TREE; | |
6305 | } | |
6306 | ||
6307 | default: | |
6308 | return NULL_TREE; | |
6309 | } | |
6310 | } | |
6311 | ||
6312 | /* Fold STMT to a constant using VALUEIZE to valueize SSA names. | |
6313 | Returns NULL_TREE if folding to a constant is not possible, otherwise | |
6314 | returns a constant according to is_gimple_min_invariant. */ | |
6315 | ||
6316 | tree | |
355fe088 | 6317 | gimple_fold_stmt_to_constant (gimple *stmt, tree (*valueize) (tree)) |
cfef45c8 RG |
6318 | { |
6319 | tree res = gimple_fold_stmt_to_constant_1 (stmt, valueize); | |
6320 | if (res && is_gimple_min_invariant (res)) | |
6321 | return res; | |
6322 | return NULL_TREE; | |
6323 | } | |
6324 | ||
6325 | ||
6326 | /* The following set of functions are supposed to fold references using | |
6327 | their constant initializers. */ | |
6328 | ||
cfef45c8 RG |
6329 | /* See if we can find constructor defining value of BASE. |
6330 | When we know the consructor with constant offset (such as | |
6331 | base is array[40] and we do know constructor of array), then | |
6332 | BIT_OFFSET is adjusted accordingly. | |
6333 | ||
6334 | As a special case, return error_mark_node when constructor | |
6335 | is not explicitly available, but it is known to be zero | |
6336 | such as 'static const int a;'. */ | |
6337 | static tree | |
588db50c | 6338 | get_base_constructor (tree base, poly_int64_pod *bit_offset, |
cfef45c8 RG |
6339 | tree (*valueize)(tree)) |
6340 | { | |
588db50c | 6341 | poly_int64 bit_offset2, size, max_size; |
ee45a32d EB |
6342 | bool reverse; |
6343 | ||
cfef45c8 RG |
6344 | if (TREE_CODE (base) == MEM_REF) |
6345 | { | |
6346 | if (!integer_zerop (TREE_OPERAND (base, 1))) | |
6347 | { | |
9541ffee | 6348 | if (!tree_fits_shwi_p (TREE_OPERAND (base, 1))) |
cfef45c8 | 6349 | return NULL_TREE; |
aca52e6f | 6350 | *bit_offset += (mem_ref_offset (base).force_shwi () |
cfef45c8 RG |
6351 | * BITS_PER_UNIT); |
6352 | } | |
6353 | ||
6354 | if (valueize | |
6355 | && TREE_CODE (TREE_OPERAND (base, 0)) == SSA_NAME) | |
6356 | base = valueize (TREE_OPERAND (base, 0)); | |
6357 | if (!base || TREE_CODE (base) != ADDR_EXPR) | |
6358 | return NULL_TREE; | |
6359 | base = TREE_OPERAND (base, 0); | |
6360 | } | |
13e88953 RB |
6361 | else if (valueize |
6362 | && TREE_CODE (base) == SSA_NAME) | |
6363 | base = valueize (base); | |
cfef45c8 RG |
6364 | |
6365 | /* Get a CONSTRUCTOR. If BASE is a VAR_DECL, get its | |
6366 | DECL_INITIAL. If BASE is a nested reference into another | |
6367 | ARRAY_REF or COMPONENT_REF, make a recursive call to resolve | |
6368 | the inner reference. */ | |
6369 | switch (TREE_CODE (base)) | |
6370 | { | |
6371 | case VAR_DECL: | |
cfef45c8 | 6372 | case CONST_DECL: |
6a6dac52 JH |
6373 | { |
6374 | tree init = ctor_for_folding (base); | |
6375 | ||
688010ba | 6376 | /* Our semantic is exact opposite of ctor_for_folding; |
6a6dac52 JH |
6377 | NULL means unknown, while error_mark_node is 0. */ |
6378 | if (init == error_mark_node) | |
6379 | return NULL_TREE; | |
6380 | if (!init) | |
6381 | return error_mark_node; | |
6382 | return init; | |
6383 | } | |
cfef45c8 | 6384 | |
13e88953 RB |
6385 | case VIEW_CONVERT_EXPR: |
6386 | return get_base_constructor (TREE_OPERAND (base, 0), | |
6387 | bit_offset, valueize); | |
6388 | ||
cfef45c8 RG |
6389 | case ARRAY_REF: |
6390 | case COMPONENT_REF: | |
ee45a32d EB |
6391 | base = get_ref_base_and_extent (base, &bit_offset2, &size, &max_size, |
6392 | &reverse); | |
588db50c | 6393 | if (!known_size_p (max_size) || maybe_ne (size, max_size)) |
cfef45c8 RG |
6394 | return NULL_TREE; |
6395 | *bit_offset += bit_offset2; | |
6396 | return get_base_constructor (base, bit_offset, valueize); | |
6397 | ||
cfef45c8 RG |
6398 | case CONSTRUCTOR: |
6399 | return base; | |
6400 | ||
6401 | default: | |
13e88953 RB |
6402 | if (CONSTANT_CLASS_P (base)) |
6403 | return base; | |
6404 | ||
cfef45c8 RG |
6405 | return NULL_TREE; |
6406 | } | |
6407 | } | |
6408 | ||
cfef45c8 RG |
6409 | /* CTOR is CONSTRUCTOR of an array type. Fold reference of type TYPE and size |
6410 | SIZE to the memory at bit OFFSET. */ | |
6411 | ||
6412 | static tree | |
6413 | fold_array_ctor_reference (tree type, tree ctor, | |
6414 | unsigned HOST_WIDE_INT offset, | |
c44c2088 JH |
6415 | unsigned HOST_WIDE_INT size, |
6416 | tree from_decl) | |
cfef45c8 | 6417 | { |
807e902e KZ |
6418 | offset_int low_bound; |
6419 | offset_int elt_size; | |
807e902e | 6420 | offset_int access_index; |
6a636014 | 6421 | tree domain_type = NULL_TREE; |
cfef45c8 RG |
6422 | HOST_WIDE_INT inner_offset; |
6423 | ||
6424 | /* Compute low bound and elt size. */ | |
eb8f1123 RG |
6425 | if (TREE_CODE (TREE_TYPE (ctor)) == ARRAY_TYPE) |
6426 | domain_type = TYPE_DOMAIN (TREE_TYPE (ctor)); | |
cfef45c8 RG |
6427 | if (domain_type && TYPE_MIN_VALUE (domain_type)) |
6428 | { | |
6429 | /* Static constructors for variably sized objects makes no sense. */ | |
9ef2eff0 RB |
6430 | if (TREE_CODE (TYPE_MIN_VALUE (domain_type)) != INTEGER_CST) |
6431 | return NULL_TREE; | |
807e902e | 6432 | low_bound = wi::to_offset (TYPE_MIN_VALUE (domain_type)); |
cfef45c8 RG |
6433 | } |
6434 | else | |
807e902e | 6435 | low_bound = 0; |
cfef45c8 | 6436 | /* Static constructors for variably sized objects makes no sense. */ |
9ef2eff0 RB |
6437 | if (TREE_CODE (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (ctor)))) != INTEGER_CST) |
6438 | return NULL_TREE; | |
807e902e | 6439 | elt_size = wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (ctor)))); |
cfef45c8 RG |
6440 | |
6441 | /* We can handle only constantly sized accesses that are known to not | |
6442 | be larger than size of array element. */ | |
6443 | if (!TYPE_SIZE_UNIT (type) | |
6444 | || TREE_CODE (TYPE_SIZE_UNIT (type)) != INTEGER_CST | |
032c80e9 | 6445 | || elt_size < wi::to_offset (TYPE_SIZE_UNIT (type)) |
807e902e | 6446 | || elt_size == 0) |
cfef45c8 RG |
6447 | return NULL_TREE; |
6448 | ||
6449 | /* Compute the array index we look for. */ | |
807e902e KZ |
6450 | access_index = wi::udiv_trunc (offset_int (offset / BITS_PER_UNIT), |
6451 | elt_size); | |
27bcd47c | 6452 | access_index += low_bound; |
cfef45c8 RG |
6453 | |
6454 | /* And offset within the access. */ | |
27bcd47c | 6455 | inner_offset = offset % (elt_size.to_uhwi () * BITS_PER_UNIT); |
cfef45c8 RG |
6456 | |
6457 | /* See if the array field is large enough to span whole access. We do not | |
6458 | care to fold accesses spanning multiple array indexes. */ | |
27bcd47c | 6459 | if (inner_offset + size > elt_size.to_uhwi () * BITS_PER_UNIT) |
cfef45c8 | 6460 | return NULL_TREE; |
6a636014 AL |
6461 | if (tree val = get_array_ctor_element_at_index (ctor, access_index)) |
6462 | return fold_ctor_reference (type, val, inner_offset, size, from_decl); | |
cfef45c8 | 6463 | |
cfef45c8 RG |
6464 | /* When memory is not explicitely mentioned in constructor, |
6465 | it is 0 (or out of range). */ | |
6466 | return build_zero_cst (type); | |
6467 | } | |
6468 | ||
6469 | /* CTOR is CONSTRUCTOR of an aggregate or vector. | |
6470 | Fold reference of type TYPE and size SIZE to the memory at bit OFFSET. */ | |
6471 | ||
6472 | static tree | |
6473 | fold_nonarray_ctor_reference (tree type, tree ctor, | |
6474 | unsigned HOST_WIDE_INT offset, | |
c44c2088 JH |
6475 | unsigned HOST_WIDE_INT size, |
6476 | tree from_decl) | |
cfef45c8 RG |
6477 | { |
6478 | unsigned HOST_WIDE_INT cnt; | |
6479 | tree cfield, cval; | |
6480 | ||
6481 | FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (ctor), cnt, cfield, | |
6482 | cval) | |
6483 | { | |
6484 | tree byte_offset = DECL_FIELD_OFFSET (cfield); | |
6485 | tree field_offset = DECL_FIELD_BIT_OFFSET (cfield); | |
6486 | tree field_size = DECL_SIZE (cfield); | |
807e902e KZ |
6487 | offset_int bitoffset; |
6488 | offset_int bitoffset_end, access_end; | |
cfef45c8 RG |
6489 | |
6490 | /* Variable sized objects in static constructors makes no sense, | |
6491 | but field_size can be NULL for flexible array members. */ | |
6492 | gcc_assert (TREE_CODE (field_offset) == INTEGER_CST | |
6493 | && TREE_CODE (byte_offset) == INTEGER_CST | |
6494 | && (field_size != NULL_TREE | |
6495 | ? TREE_CODE (field_size) == INTEGER_CST | |
6496 | : TREE_CODE (TREE_TYPE (cfield)) == ARRAY_TYPE)); | |
6497 | ||
6498 | /* Compute bit offset of the field. */ | |
807e902e | 6499 | bitoffset = (wi::to_offset (field_offset) |
8de73453 | 6500 | + (wi::to_offset (byte_offset) << LOG2_BITS_PER_UNIT)); |
cfef45c8 RG |
6501 | /* Compute bit offset where the field ends. */ |
6502 | if (field_size != NULL_TREE) | |
807e902e | 6503 | bitoffset_end = bitoffset + wi::to_offset (field_size); |
cfef45c8 | 6504 | else |
807e902e | 6505 | bitoffset_end = 0; |
cfef45c8 | 6506 | |
807e902e | 6507 | access_end = offset_int (offset) + size; |
b8b2b009 JJ |
6508 | |
6509 | /* Is there any overlap between [OFFSET, OFFSET+SIZE) and | |
6510 | [BITOFFSET, BITOFFSET_END)? */ | |
807e902e | 6511 | if (wi::cmps (access_end, bitoffset) > 0 |
cfef45c8 | 6512 | && (field_size == NULL_TREE |
807e902e | 6513 | || wi::lts_p (offset, bitoffset_end))) |
cfef45c8 | 6514 | { |
807e902e | 6515 | offset_int inner_offset = offset_int (offset) - bitoffset; |
cfef45c8 RG |
6516 | /* We do have overlap. Now see if field is large enough to |
6517 | cover the access. Give up for accesses spanning multiple | |
6518 | fields. */ | |
807e902e | 6519 | if (wi::cmps (access_end, bitoffset_end) > 0) |
cfef45c8 | 6520 | return NULL_TREE; |
032c80e9 | 6521 | if (offset < bitoffset) |
b8b2b009 | 6522 | return NULL_TREE; |
cfef45c8 | 6523 | return fold_ctor_reference (type, cval, |
27bcd47c | 6524 | inner_offset.to_uhwi (), size, |
c44c2088 | 6525 | from_decl); |
cfef45c8 RG |
6526 | } |
6527 | } | |
6528 | /* When memory is not explicitely mentioned in constructor, it is 0. */ | |
6529 | return build_zero_cst (type); | |
6530 | } | |
6531 | ||
30acf282 RS |
6532 | /* CTOR is value initializing memory, fold reference of type TYPE and |
6533 | size POLY_SIZE to the memory at bit POLY_OFFSET. */ | |
cfef45c8 | 6534 | |
8403c2cf | 6535 | tree |
30acf282 RS |
6536 | fold_ctor_reference (tree type, tree ctor, poly_uint64 poly_offset, |
6537 | poly_uint64 poly_size, tree from_decl) | |
cfef45c8 RG |
6538 | { |
6539 | tree ret; | |
6540 | ||
6541 | /* We found the field with exact match. */ | |
6542 | if (useless_type_conversion_p (type, TREE_TYPE (ctor)) | |
30acf282 | 6543 | && known_eq (poly_offset, 0U)) |
9d60be38 | 6544 | return canonicalize_constructor_val (unshare_expr (ctor), from_decl); |
cfef45c8 | 6545 | |
30acf282 RS |
6546 | /* The remaining optimizations need a constant size and offset. */ |
6547 | unsigned HOST_WIDE_INT size, offset; | |
6548 | if (!poly_size.is_constant (&size) || !poly_offset.is_constant (&offset)) | |
6549 | return NULL_TREE; | |
6550 | ||
cfef45c8 RG |
6551 | /* We are at the end of walk, see if we can view convert the |
6552 | result. */ | |
6553 | if (!AGGREGATE_TYPE_P (TREE_TYPE (ctor)) && !offset | |
6554 | /* VIEW_CONVERT_EXPR is defined only for matching sizes. */ | |
3d8208ce TP |
6555 | && !compare_tree_int (TYPE_SIZE (type), size) |
6556 | && !compare_tree_int (TYPE_SIZE (TREE_TYPE (ctor)), size)) | |
cfef45c8 | 6557 | { |
9d60be38 | 6558 | ret = canonicalize_constructor_val (unshare_expr (ctor), from_decl); |
cfef45c8 | 6559 | if (ret) |
672d9f8e RB |
6560 | { |
6561 | ret = fold_unary (VIEW_CONVERT_EXPR, type, ret); | |
6562 | if (ret) | |
6563 | STRIP_USELESS_TYPE_CONVERSION (ret); | |
6564 | } | |
cfef45c8 RG |
6565 | return ret; |
6566 | } | |
b2505143 RB |
6567 | /* For constants and byte-aligned/sized reads try to go through |
6568 | native_encode/interpret. */ | |
6569 | if (CONSTANT_CLASS_P (ctor) | |
6570 | && BITS_PER_UNIT == 8 | |
6571 | && offset % BITS_PER_UNIT == 0 | |
6572 | && size % BITS_PER_UNIT == 0 | |
6573 | && size <= MAX_BITSIZE_MODE_ANY_MODE) | |
6574 | { | |
6575 | unsigned char buf[MAX_BITSIZE_MODE_ANY_MODE / BITS_PER_UNIT]; | |
1ff0a84c JJ |
6576 | int len = native_encode_expr (ctor, buf, size / BITS_PER_UNIT, |
6577 | offset / BITS_PER_UNIT); | |
6578 | if (len > 0) | |
6579 | return native_interpret_expr (type, buf, len); | |
b2505143 | 6580 | } |
cfef45c8 RG |
6581 | if (TREE_CODE (ctor) == CONSTRUCTOR) |
6582 | { | |
6583 | ||
eb8f1123 RG |
6584 | if (TREE_CODE (TREE_TYPE (ctor)) == ARRAY_TYPE |
6585 | || TREE_CODE (TREE_TYPE (ctor)) == VECTOR_TYPE) | |
c44c2088 JH |
6586 | return fold_array_ctor_reference (type, ctor, offset, size, |
6587 | from_decl); | |
cfef45c8 | 6588 | else |
c44c2088 JH |
6589 | return fold_nonarray_ctor_reference (type, ctor, offset, size, |
6590 | from_decl); | |
cfef45c8 RG |
6591 | } |
6592 | ||
6593 | return NULL_TREE; | |
6594 | } | |
6595 | ||
6596 | /* Return the tree representing the element referenced by T if T is an | |
6597 | ARRAY_REF or COMPONENT_REF into constant aggregates valuezing SSA | |
6598 | names using VALUEIZE. Return NULL_TREE otherwise. */ | |
6599 | ||
6600 | tree | |
6601 | fold_const_aggregate_ref_1 (tree t, tree (*valueize) (tree)) | |
6602 | { | |
6603 | tree ctor, idx, base; | |
588db50c | 6604 | poly_int64 offset, size, max_size; |
cfef45c8 | 6605 | tree tem; |
ee45a32d | 6606 | bool reverse; |
cfef45c8 | 6607 | |
f8a7df45 RG |
6608 | if (TREE_THIS_VOLATILE (t)) |
6609 | return NULL_TREE; | |
6610 | ||
3a65ee74 | 6611 | if (DECL_P (t)) |
cfef45c8 RG |
6612 | return get_symbol_constant_value (t); |
6613 | ||
6614 | tem = fold_read_from_constant_string (t); | |
6615 | if (tem) | |
6616 | return tem; | |
6617 | ||
6618 | switch (TREE_CODE (t)) | |
6619 | { | |
6620 | case ARRAY_REF: | |
6621 | case ARRAY_RANGE_REF: | |
6622 | /* Constant indexes are handled well by get_base_constructor. | |
6623 | Only special case variable offsets. | |
6624 | FIXME: This code can't handle nested references with variable indexes | |
6625 | (they will be handled only by iteration of ccp). Perhaps we can bring | |
6626 | get_ref_base_and_extent here and make it use a valueize callback. */ | |
6627 | if (TREE_CODE (TREE_OPERAND (t, 1)) == SSA_NAME | |
6628 | && valueize | |
6629 | && (idx = (*valueize) (TREE_OPERAND (t, 1))) | |
588db50c | 6630 | && poly_int_tree_p (idx)) |
cfef45c8 RG |
6631 | { |
6632 | tree low_bound, unit_size; | |
6633 | ||
6634 | /* If the resulting bit-offset is constant, track it. */ | |
6635 | if ((low_bound = array_ref_low_bound (t), | |
588db50c | 6636 | poly_int_tree_p (low_bound)) |
cfef45c8 | 6637 | && (unit_size = array_ref_element_size (t), |
807e902e | 6638 | tree_fits_uhwi_p (unit_size))) |
cfef45c8 | 6639 | { |
588db50c RS |
6640 | poly_offset_int woffset |
6641 | = wi::sext (wi::to_poly_offset (idx) | |
6642 | - wi::to_poly_offset (low_bound), | |
807e902e KZ |
6643 | TYPE_PRECISION (TREE_TYPE (idx))); |
6644 | ||
588db50c | 6645 | if (woffset.to_shwi (&offset)) |
807e902e | 6646 | { |
807e902e KZ |
6647 | /* TODO: This code seems wrong, multiply then check |
6648 | to see if it fits. */ | |
6649 | offset *= tree_to_uhwi (unit_size); | |
6650 | offset *= BITS_PER_UNIT; | |
6651 | ||
6652 | base = TREE_OPERAND (t, 0); | |
6653 | ctor = get_base_constructor (base, &offset, valueize); | |
6654 | /* Empty constructor. Always fold to 0. */ | |
6655 | if (ctor == error_mark_node) | |
6656 | return build_zero_cst (TREE_TYPE (t)); | |
6657 | /* Out of bound array access. Value is undefined, | |
6658 | but don't fold. */ | |
588db50c | 6659 | if (maybe_lt (offset, 0)) |
807e902e KZ |
6660 | return NULL_TREE; |
6661 | /* We can not determine ctor. */ | |
6662 | if (!ctor) | |
6663 | return NULL_TREE; | |
6664 | return fold_ctor_reference (TREE_TYPE (t), ctor, offset, | |
6665 | tree_to_uhwi (unit_size) | |
6666 | * BITS_PER_UNIT, | |
6667 | base); | |
6668 | } | |
cfef45c8 RG |
6669 | } |
6670 | } | |
6671 | /* Fallthru. */ | |
6672 | ||
6673 | case COMPONENT_REF: | |
6674 | case BIT_FIELD_REF: | |
6675 | case TARGET_MEM_REF: | |
6676 | case MEM_REF: | |
ee45a32d | 6677 | base = get_ref_base_and_extent (t, &offset, &size, &max_size, &reverse); |
cfef45c8 RG |
6678 | ctor = get_base_constructor (base, &offset, valueize); |
6679 | ||
6680 | /* Empty constructor. Always fold to 0. */ | |
6681 | if (ctor == error_mark_node) | |
6682 | return build_zero_cst (TREE_TYPE (t)); | |
6683 | /* We do not know precise address. */ | |
588db50c | 6684 | if (!known_size_p (max_size) || maybe_ne (max_size, size)) |
cfef45c8 RG |
6685 | return NULL_TREE; |
6686 | /* We can not determine ctor. */ | |
6687 | if (!ctor) | |
6688 | return NULL_TREE; | |
6689 | ||
6690 | /* Out of bound array access. Value is undefined, but don't fold. */ | |
588db50c | 6691 | if (maybe_lt (offset, 0)) |
cfef45c8 RG |
6692 | return NULL_TREE; |
6693 | ||
c44c2088 JH |
6694 | return fold_ctor_reference (TREE_TYPE (t), ctor, offset, size, |
6695 | base); | |
cfef45c8 RG |
6696 | |
6697 | case REALPART_EXPR: | |
6698 | case IMAGPART_EXPR: | |
6699 | { | |
6700 | tree c = fold_const_aggregate_ref_1 (TREE_OPERAND (t, 0), valueize); | |
6701 | if (c && TREE_CODE (c) == COMPLEX_CST) | |
6702 | return fold_build1_loc (EXPR_LOCATION (t), | |
6703 | TREE_CODE (t), TREE_TYPE (t), c); | |
6704 | break; | |
6705 | } | |
6706 | ||
6707 | default: | |
6708 | break; | |
6709 | } | |
6710 | ||
6711 | return NULL_TREE; | |
6712 | } | |
6713 | ||
6714 | tree | |
6715 | fold_const_aggregate_ref (tree t) | |
6716 | { | |
6717 | return fold_const_aggregate_ref_1 (t, NULL); | |
6718 | } | |
06bc3ec7 | 6719 | |
85942f45 | 6720 | /* Lookup virtual method with index TOKEN in a virtual table V |
ec77d61f JH |
6721 | at OFFSET. |
6722 | Set CAN_REFER if non-NULL to false if method | |
6723 | is not referable or if the virtual table is ill-formed (such as rewriten | |
6724 | by non-C++ produced symbol). Otherwise just return NULL in that calse. */ | |
81fa35bd MJ |
6725 | |
6726 | tree | |
85942f45 JH |
6727 | gimple_get_virt_method_for_vtable (HOST_WIDE_INT token, |
6728 | tree v, | |
ec77d61f JH |
6729 | unsigned HOST_WIDE_INT offset, |
6730 | bool *can_refer) | |
81fa35bd | 6731 | { |
85942f45 JH |
6732 | tree vtable = v, init, fn; |
6733 | unsigned HOST_WIDE_INT size; | |
8c311b50 JH |
6734 | unsigned HOST_WIDE_INT elt_size, access_index; |
6735 | tree domain_type; | |
81fa35bd | 6736 | |
ec77d61f JH |
6737 | if (can_refer) |
6738 | *can_refer = true; | |
6739 | ||
9de2f554 | 6740 | /* First of all double check we have virtual table. */ |
8813a647 | 6741 | if (!VAR_P (v) || !DECL_VIRTUAL_P (v)) |
ec77d61f | 6742 | { |
ec77d61f JH |
6743 | /* Pass down that we lost track of the target. */ |
6744 | if (can_refer) | |
6745 | *can_refer = false; | |
6746 | return NULL_TREE; | |
6747 | } | |
9de2f554 | 6748 | |
2aa3da06 JH |
6749 | init = ctor_for_folding (v); |
6750 | ||
9de2f554 | 6751 | /* The virtual tables should always be born with constructors |
2aa3da06 JH |
6752 | and we always should assume that they are avaialble for |
6753 | folding. At the moment we do not stream them in all cases, | |
6754 | but it should never happen that ctor seem unreachable. */ | |
6755 | gcc_assert (init); | |
6756 | if (init == error_mark_node) | |
6757 | { | |
ec77d61f JH |
6758 | /* Pass down that we lost track of the target. */ |
6759 | if (can_refer) | |
6760 | *can_refer = false; | |
2aa3da06 JH |
6761 | return NULL_TREE; |
6762 | } | |
81fa35bd | 6763 | gcc_checking_assert (TREE_CODE (TREE_TYPE (v)) == ARRAY_TYPE); |
ae7e9ddd | 6764 | size = tree_to_uhwi (TYPE_SIZE (TREE_TYPE (TREE_TYPE (v)))); |
85942f45 | 6765 | offset *= BITS_PER_UNIT; |
81fa35bd | 6766 | offset += token * size; |
9de2f554 | 6767 | |
8c311b50 JH |
6768 | /* Lookup the value in the constructor that is assumed to be array. |
6769 | This is equivalent to | |
6770 | fn = fold_ctor_reference (TREE_TYPE (TREE_TYPE (v)), init, | |
6771 | offset, size, NULL); | |
6772 | but in a constant time. We expect that frontend produced a simple | |
6773 | array without indexed initializers. */ | |
6774 | ||
6775 | gcc_checking_assert (TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE); | |
6776 | domain_type = TYPE_DOMAIN (TREE_TYPE (init)); | |
6777 | gcc_checking_assert (integer_zerop (TYPE_MIN_VALUE (domain_type))); | |
6778 | elt_size = tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (init)))); | |
6779 | ||
6780 | access_index = offset / BITS_PER_UNIT / elt_size; | |
6781 | gcc_checking_assert (offset % (elt_size * BITS_PER_UNIT) == 0); | |
6782 | ||
6783 | /* This code makes an assumption that there are no | |
6784 | indexed fileds produced by C++ FE, so we can directly index the array. */ | |
6785 | if (access_index < CONSTRUCTOR_NELTS (init)) | |
6786 | { | |
6787 | fn = CONSTRUCTOR_ELT (init, access_index)->value; | |
6788 | gcc_checking_assert (!CONSTRUCTOR_ELT (init, access_index)->index); | |
6789 | STRIP_NOPS (fn); | |
6790 | } | |
6791 | else | |
6792 | fn = NULL; | |
9de2f554 JH |
6793 | |
6794 | /* For type inconsistent program we may end up looking up virtual method | |
6795 | in virtual table that does not contain TOKEN entries. We may overrun | |
6796 | the virtual table and pick up a constant or RTTI info pointer. | |
6797 | In any case the call is undefined. */ | |
6798 | if (!fn | |
6799 | || (TREE_CODE (fn) != ADDR_EXPR && TREE_CODE (fn) != FDESC_EXPR) | |
6800 | || TREE_CODE (TREE_OPERAND (fn, 0)) != FUNCTION_DECL) | |
6801 | fn = builtin_decl_implicit (BUILT_IN_UNREACHABLE); | |
6802 | else | |
6803 | { | |
6804 | fn = TREE_OPERAND (fn, 0); | |
6805 | ||
6806 | /* When cgraph node is missing and function is not public, we cannot | |
6807 | devirtualize. This can happen in WHOPR when the actual method | |
6808 | ends up in other partition, because we found devirtualization | |
6809 | possibility too late. */ | |
6810 | if (!can_refer_decl_in_current_unit_p (fn, vtable)) | |
ec77d61f JH |
6811 | { |
6812 | if (can_refer) | |
6813 | { | |
6814 | *can_refer = false; | |
6815 | return fn; | |
6816 | } | |
6817 | return NULL_TREE; | |
6818 | } | |
9de2f554 | 6819 | } |
81fa35bd | 6820 | |
7501ca28 RG |
6821 | /* Make sure we create a cgraph node for functions we'll reference. |
6822 | They can be non-existent if the reference comes from an entry | |
6823 | of an external vtable for example. */ | |
d52f5295 | 6824 | cgraph_node::get_create (fn); |
7501ca28 | 6825 | |
81fa35bd MJ |
6826 | return fn; |
6827 | } | |
6828 | ||
85942f45 JH |
6829 | /* Return a declaration of a function which an OBJ_TYPE_REF references. TOKEN |
6830 | is integer form of OBJ_TYPE_REF_TOKEN of the reference expression. | |
6831 | KNOWN_BINFO carries the binfo describing the true type of | |
ec77d61f JH |
6832 | OBJ_TYPE_REF_OBJECT(REF). |
6833 | Set CAN_REFER if non-NULL to false if method | |
6834 | is not referable or if the virtual table is ill-formed (such as rewriten | |
6835 | by non-C++ produced symbol). Otherwise just return NULL in that calse. */ | |
85942f45 JH |
6836 | |
6837 | tree | |
ec77d61f JH |
6838 | gimple_get_virt_method_for_binfo (HOST_WIDE_INT token, tree known_binfo, |
6839 | bool *can_refer) | |
85942f45 JH |
6840 | { |
6841 | unsigned HOST_WIDE_INT offset; | |
6842 | tree v; | |
6843 | ||
6844 | v = BINFO_VTABLE (known_binfo); | |
6845 | /* If there is no virtual methods table, leave the OBJ_TYPE_REF alone. */ | |
6846 | if (!v) | |
6847 | return NULL_TREE; | |
6848 | ||
6849 | if (!vtable_pointer_value_to_vtable (v, &v, &offset)) | |
ec77d61f JH |
6850 | { |
6851 | if (can_refer) | |
6852 | *can_refer = false; | |
6853 | return NULL_TREE; | |
6854 | } | |
6855 | return gimple_get_virt_method_for_vtable (token, v, offset, can_refer); | |
85942f45 JH |
6856 | } |
6857 | ||
737f500a RB |
6858 | /* Given a pointer value T, return a simplified version of an |
6859 | indirection through T, or NULL_TREE if no simplification is | |
b184c8f1 AM |
6860 | possible. Note that the resulting type may be different from |
6861 | the type pointed to in the sense that it is still compatible | |
6862 | from the langhooks point of view. */ | |
6863 | ||
6864 | tree | |
6865 | gimple_fold_indirect_ref (tree t) | |
6866 | { | |
6867 | tree ptype = TREE_TYPE (t), type = TREE_TYPE (ptype); | |
6868 | tree sub = t; | |
6869 | tree subtype; | |
6870 | ||
6871 | STRIP_NOPS (sub); | |
6872 | subtype = TREE_TYPE (sub); | |
737f500a RB |
6873 | if (!POINTER_TYPE_P (subtype) |
6874 | || TYPE_REF_CAN_ALIAS_ALL (ptype)) | |
b184c8f1 AM |
6875 | return NULL_TREE; |
6876 | ||
6877 | if (TREE_CODE (sub) == ADDR_EXPR) | |
6878 | { | |
6879 | tree op = TREE_OPERAND (sub, 0); | |
6880 | tree optype = TREE_TYPE (op); | |
6881 | /* *&p => p */ | |
6882 | if (useless_type_conversion_p (type, optype)) | |
6883 | return op; | |
6884 | ||
6885 | /* *(foo *)&fooarray => fooarray[0] */ | |
6886 | if (TREE_CODE (optype) == ARRAY_TYPE | |
6887 | && TREE_CODE (TYPE_SIZE (TREE_TYPE (optype))) == INTEGER_CST | |
6888 | && useless_type_conversion_p (type, TREE_TYPE (optype))) | |
6889 | { | |
6890 | tree type_domain = TYPE_DOMAIN (optype); | |
6891 | tree min_val = size_zero_node; | |
6892 | if (type_domain && TYPE_MIN_VALUE (type_domain)) | |
6893 | min_val = TYPE_MIN_VALUE (type_domain); | |
6894 | if (TREE_CODE (min_val) == INTEGER_CST) | |
6895 | return build4 (ARRAY_REF, type, op, min_val, NULL_TREE, NULL_TREE); | |
6896 | } | |
6897 | /* *(foo *)&complexfoo => __real__ complexfoo */ | |
6898 | else if (TREE_CODE (optype) == COMPLEX_TYPE | |
6899 | && useless_type_conversion_p (type, TREE_TYPE (optype))) | |
6900 | return fold_build1 (REALPART_EXPR, type, op); | |
6901 | /* *(foo *)&vectorfoo => BIT_FIELD_REF<vectorfoo,...> */ | |
6902 | else if (TREE_CODE (optype) == VECTOR_TYPE | |
6903 | && useless_type_conversion_p (type, TREE_TYPE (optype))) | |
6904 | { | |
6905 | tree part_width = TYPE_SIZE (type); | |
6906 | tree index = bitsize_int (0); | |
6907 | return fold_build3 (BIT_FIELD_REF, type, op, part_width, index); | |
6908 | } | |
6909 | } | |
6910 | ||
6911 | /* *(p + CST) -> ... */ | |
6912 | if (TREE_CODE (sub) == POINTER_PLUS_EXPR | |
6913 | && TREE_CODE (TREE_OPERAND (sub, 1)) == INTEGER_CST) | |
6914 | { | |
6915 | tree addr = TREE_OPERAND (sub, 0); | |
6916 | tree off = TREE_OPERAND (sub, 1); | |
6917 | tree addrtype; | |
6918 | ||
6919 | STRIP_NOPS (addr); | |
6920 | addrtype = TREE_TYPE (addr); | |
6921 | ||
6922 | /* ((foo*)&vectorfoo)[1] -> BIT_FIELD_REF<vectorfoo,...> */ | |
6923 | if (TREE_CODE (addr) == ADDR_EXPR | |
6924 | && TREE_CODE (TREE_TYPE (addrtype)) == VECTOR_TYPE | |
6925 | && useless_type_conversion_p (type, TREE_TYPE (TREE_TYPE (addrtype))) | |
cc269bb6 | 6926 | && tree_fits_uhwi_p (off)) |
b184c8f1 | 6927 | { |
ae7e9ddd | 6928 | unsigned HOST_WIDE_INT offset = tree_to_uhwi (off); |
b184c8f1 AM |
6929 | tree part_width = TYPE_SIZE (type); |
6930 | unsigned HOST_WIDE_INT part_widthi | |
9439e9a1 | 6931 | = tree_to_shwi (part_width) / BITS_PER_UNIT; |
b184c8f1 AM |
6932 | unsigned HOST_WIDE_INT indexi = offset * BITS_PER_UNIT; |
6933 | tree index = bitsize_int (indexi); | |
928686b1 RS |
6934 | if (known_lt (offset / part_widthi, |
6935 | TYPE_VECTOR_SUBPARTS (TREE_TYPE (addrtype)))) | |
b184c8f1 AM |
6936 | return fold_build3 (BIT_FIELD_REF, type, TREE_OPERAND (addr, 0), |
6937 | part_width, index); | |
6938 | } | |
6939 | ||
6940 | /* ((foo*)&complexfoo)[1] -> __imag__ complexfoo */ | |
6941 | if (TREE_CODE (addr) == ADDR_EXPR | |
6942 | && TREE_CODE (TREE_TYPE (addrtype)) == COMPLEX_TYPE | |
6943 | && useless_type_conversion_p (type, TREE_TYPE (TREE_TYPE (addrtype)))) | |
6944 | { | |
6945 | tree size = TYPE_SIZE_UNIT (type); | |
6946 | if (tree_int_cst_equal (size, off)) | |
6947 | return fold_build1 (IMAGPART_EXPR, type, TREE_OPERAND (addr, 0)); | |
6948 | } | |
6949 | ||
6950 | /* *(p + CST) -> MEM_REF <p, CST>. */ | |
6951 | if (TREE_CODE (addr) != ADDR_EXPR | |
6952 | || DECL_P (TREE_OPERAND (addr, 0))) | |
6953 | return fold_build2 (MEM_REF, type, | |
6954 | addr, | |
8e6cdc90 | 6955 | wide_int_to_tree (ptype, wi::to_wide (off))); |
b184c8f1 AM |
6956 | } |
6957 | ||
6958 | /* *(foo *)fooarrptr => (*fooarrptr)[0] */ | |
6959 | if (TREE_CODE (TREE_TYPE (subtype)) == ARRAY_TYPE | |
6960 | && TREE_CODE (TYPE_SIZE (TREE_TYPE (TREE_TYPE (subtype)))) == INTEGER_CST | |
6961 | && useless_type_conversion_p (type, TREE_TYPE (TREE_TYPE (subtype)))) | |
6962 | { | |
6963 | tree type_domain; | |
6964 | tree min_val = size_zero_node; | |
6965 | tree osub = sub; | |
6966 | sub = gimple_fold_indirect_ref (sub); | |
6967 | if (! sub) | |
6968 | sub = build1 (INDIRECT_REF, TREE_TYPE (subtype), osub); | |
6969 | type_domain = TYPE_DOMAIN (TREE_TYPE (sub)); | |
6970 | if (type_domain && TYPE_MIN_VALUE (type_domain)) | |
6971 | min_val = TYPE_MIN_VALUE (type_domain); | |
6972 | if (TREE_CODE (min_val) == INTEGER_CST) | |
6973 | return build4 (ARRAY_REF, type, sub, min_val, NULL_TREE, NULL_TREE); | |
6974 | } | |
6975 | ||
6976 | return NULL_TREE; | |
6977 | } | |
19e51b40 JJ |
6978 | |
6979 | /* Return true if CODE is an operation that when operating on signed | |
6980 | integer types involves undefined behavior on overflow and the | |
6981 | operation can be expressed with unsigned arithmetic. */ | |
6982 | ||
6983 | bool | |
6984 | arith_code_with_undefined_signed_overflow (tree_code code) | |
6985 | { | |
6986 | switch (code) | |
6987 | { | |
6988 | case PLUS_EXPR: | |
6989 | case MINUS_EXPR: | |
6990 | case MULT_EXPR: | |
6991 | case NEGATE_EXPR: | |
6992 | case POINTER_PLUS_EXPR: | |
6993 | return true; | |
6994 | default: | |
6995 | return false; | |
6996 | } | |
6997 | } | |
6998 | ||
6999 | /* Rewrite STMT, an assignment with a signed integer or pointer arithmetic | |
7000 | operation that can be transformed to unsigned arithmetic by converting | |
7001 | its operand, carrying out the operation in the corresponding unsigned | |
7002 | type and converting the result back to the original type. | |
7003 | ||
7004 | Returns a sequence of statements that replace STMT and also contain | |
7005 | a modified form of STMT itself. */ | |
7006 | ||
7007 | gimple_seq | |
355fe088 | 7008 | rewrite_to_defined_overflow (gimple *stmt) |
19e51b40 JJ |
7009 | { |
7010 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
7011 | { | |
7012 | fprintf (dump_file, "rewriting stmt with undefined signed " | |
7013 | "overflow "); | |
7014 | print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
7015 | } | |
7016 | ||
7017 | tree lhs = gimple_assign_lhs (stmt); | |
7018 | tree type = unsigned_type_for (TREE_TYPE (lhs)); | |
7019 | gimple_seq stmts = NULL; | |
7020 | for (unsigned i = 1; i < gimple_num_ops (stmt); ++i) | |
7021 | { | |
74e3c262 RB |
7022 | tree op = gimple_op (stmt, i); |
7023 | op = gimple_convert (&stmts, type, op); | |
7024 | gimple_set_op (stmt, i, op); | |
19e51b40 JJ |
7025 | } |
7026 | gimple_assign_set_lhs (stmt, make_ssa_name (type, stmt)); | |
7027 | if (gimple_assign_rhs_code (stmt) == POINTER_PLUS_EXPR) | |
7028 | gimple_assign_set_rhs_code (stmt, PLUS_EXPR); | |
7029 | gimple_seq_add_stmt (&stmts, stmt); | |
355fe088 | 7030 | gimple *cvt = gimple_build_assign (lhs, NOP_EXPR, gimple_assign_lhs (stmt)); |
19e51b40 JJ |
7031 | gimple_seq_add_stmt (&stmts, cvt); |
7032 | ||
7033 | return stmts; | |
7034 | } | |
d4f5cd5e | 7035 | |
3d2cf79f | 7036 | |
c26de36d RB |
7037 | /* The valueization hook we use for the gimple_build API simplification. |
7038 | This makes us match fold_buildN behavior by only combining with | |
7039 | statements in the sequence(s) we are currently building. */ | |
7040 | ||
7041 | static tree | |
7042 | gimple_build_valueize (tree op) | |
7043 | { | |
7044 | if (gimple_bb (SSA_NAME_DEF_STMT (op)) == NULL) | |
7045 | return op; | |
7046 | return NULL_TREE; | |
7047 | } | |
7048 | ||
3d2cf79f | 7049 | /* Build the expression CODE OP0 of type TYPE with location LOC, |
c26de36d | 7050 | simplifying it first if possible. Returns the built |
3d2cf79f RB |
7051 | expression value and appends statements possibly defining it |
7052 | to SEQ. */ | |
7053 | ||
7054 | tree | |
7055 | gimple_build (gimple_seq *seq, location_t loc, | |
c26de36d | 7056 | enum tree_code code, tree type, tree op0) |
3d2cf79f | 7057 | { |
c26de36d | 7058 | tree res = gimple_simplify (code, type, op0, seq, gimple_build_valueize); |
3d2cf79f RB |
7059 | if (!res) |
7060 | { | |
a15ebbcd | 7061 | res = create_tmp_reg_or_ssa_name (type); |
355fe088 | 7062 | gimple *stmt; |
3d2cf79f RB |
7063 | if (code == REALPART_EXPR |
7064 | || code == IMAGPART_EXPR | |
7065 | || code == VIEW_CONVERT_EXPR) | |
0d0e4a03 | 7066 | stmt = gimple_build_assign (res, code, build1 (code, type, op0)); |
3d2cf79f | 7067 | else |
0d0e4a03 | 7068 | stmt = gimple_build_assign (res, code, op0); |
3d2cf79f RB |
7069 | gimple_set_location (stmt, loc); |
7070 | gimple_seq_add_stmt_without_update (seq, stmt); | |
7071 | } | |
7072 | return res; | |
7073 | } | |
7074 | ||
7075 | /* Build the expression OP0 CODE OP1 of type TYPE with location LOC, | |
c26de36d | 7076 | simplifying it first if possible. Returns the built |
3d2cf79f RB |
7077 | expression value and appends statements possibly defining it |
7078 | to SEQ. */ | |
7079 | ||
7080 | tree | |
7081 | gimple_build (gimple_seq *seq, location_t loc, | |
c26de36d | 7082 | enum tree_code code, tree type, tree op0, tree op1) |
3d2cf79f | 7083 | { |
c26de36d | 7084 | tree res = gimple_simplify (code, type, op0, op1, seq, gimple_build_valueize); |
3d2cf79f RB |
7085 | if (!res) |
7086 | { | |
a15ebbcd | 7087 | res = create_tmp_reg_or_ssa_name (type); |
355fe088 | 7088 | gimple *stmt = gimple_build_assign (res, code, op0, op1); |
3d2cf79f RB |
7089 | gimple_set_location (stmt, loc); |
7090 | gimple_seq_add_stmt_without_update (seq, stmt); | |
7091 | } | |
7092 | return res; | |
7093 | } | |
7094 | ||
7095 | /* Build the expression (CODE OP0 OP1 OP2) of type TYPE with location LOC, | |
c26de36d | 7096 | simplifying it first if possible. Returns the built |
3d2cf79f RB |
7097 | expression value and appends statements possibly defining it |
7098 | to SEQ. */ | |
7099 | ||
7100 | tree | |
7101 | gimple_build (gimple_seq *seq, location_t loc, | |
c26de36d | 7102 | enum tree_code code, tree type, tree op0, tree op1, tree op2) |
3d2cf79f RB |
7103 | { |
7104 | tree res = gimple_simplify (code, type, op0, op1, op2, | |
c26de36d | 7105 | seq, gimple_build_valueize); |
3d2cf79f RB |
7106 | if (!res) |
7107 | { | |
a15ebbcd | 7108 | res = create_tmp_reg_or_ssa_name (type); |
355fe088 | 7109 | gimple *stmt; |
3d2cf79f | 7110 | if (code == BIT_FIELD_REF) |
0d0e4a03 JJ |
7111 | stmt = gimple_build_assign (res, code, |
7112 | build3 (code, type, op0, op1, op2)); | |
3d2cf79f | 7113 | else |
0d0e4a03 | 7114 | stmt = gimple_build_assign (res, code, op0, op1, op2); |
3d2cf79f RB |
7115 | gimple_set_location (stmt, loc); |
7116 | gimple_seq_add_stmt_without_update (seq, stmt); | |
7117 | } | |
7118 | return res; | |
7119 | } | |
7120 | ||
7121 | /* Build the call FN (ARG0) with a result of type TYPE | |
7122 | (or no result if TYPE is void) with location LOC, | |
c26de36d | 7123 | simplifying it first if possible. Returns the built |
3d2cf79f RB |
7124 | expression value (or NULL_TREE if TYPE is void) and appends |
7125 | statements possibly defining it to SEQ. */ | |
7126 | ||
7127 | tree | |
7128 | gimple_build (gimple_seq *seq, location_t loc, | |
c26de36d | 7129 | enum built_in_function fn, tree type, tree arg0) |
3d2cf79f | 7130 | { |
c26de36d | 7131 | tree res = gimple_simplify (fn, type, arg0, seq, gimple_build_valueize); |
3d2cf79f RB |
7132 | if (!res) |
7133 | { | |
7134 | tree decl = builtin_decl_implicit (fn); | |
355fe088 | 7135 | gimple *stmt = gimple_build_call (decl, 1, arg0); |
3d2cf79f RB |
7136 | if (!VOID_TYPE_P (type)) |
7137 | { | |
a15ebbcd | 7138 | res = create_tmp_reg_or_ssa_name (type); |
3d2cf79f RB |
7139 | gimple_call_set_lhs (stmt, res); |
7140 | } | |
7141 | gimple_set_location (stmt, loc); | |
7142 | gimple_seq_add_stmt_without_update (seq, stmt); | |
7143 | } | |
7144 | return res; | |
7145 | } | |
7146 | ||
7147 | /* Build the call FN (ARG0, ARG1) with a result of type TYPE | |
7148 | (or no result if TYPE is void) with location LOC, | |
c26de36d | 7149 | simplifying it first if possible. Returns the built |
3d2cf79f RB |
7150 | expression value (or NULL_TREE if TYPE is void) and appends |
7151 | statements possibly defining it to SEQ. */ | |
7152 | ||
7153 | tree | |
7154 | gimple_build (gimple_seq *seq, location_t loc, | |
c26de36d | 7155 | enum built_in_function fn, tree type, tree arg0, tree arg1) |
3d2cf79f | 7156 | { |
c26de36d | 7157 | tree res = gimple_simplify (fn, type, arg0, arg1, seq, gimple_build_valueize); |
3d2cf79f RB |
7158 | if (!res) |
7159 | { | |
7160 | tree decl = builtin_decl_implicit (fn); | |
355fe088 | 7161 | gimple *stmt = gimple_build_call (decl, 2, arg0, arg1); |
3d2cf79f RB |
7162 | if (!VOID_TYPE_P (type)) |
7163 | { | |
a15ebbcd | 7164 | res = create_tmp_reg_or_ssa_name (type); |
3d2cf79f RB |
7165 | gimple_call_set_lhs (stmt, res); |
7166 | } | |
7167 | gimple_set_location (stmt, loc); | |
7168 | gimple_seq_add_stmt_without_update (seq, stmt); | |
7169 | } | |
7170 | return res; | |
7171 | } | |
7172 | ||
7173 | /* Build the call FN (ARG0, ARG1, ARG2) with a result of type TYPE | |
7174 | (or no result if TYPE is void) with location LOC, | |
c26de36d | 7175 | simplifying it first if possible. Returns the built |
3d2cf79f RB |
7176 | expression value (or NULL_TREE if TYPE is void) and appends |
7177 | statements possibly defining it to SEQ. */ | |
7178 | ||
7179 | tree | |
7180 | gimple_build (gimple_seq *seq, location_t loc, | |
7181 | enum built_in_function fn, tree type, | |
c26de36d | 7182 | tree arg0, tree arg1, tree arg2) |
3d2cf79f | 7183 | { |
c26de36d RB |
7184 | tree res = gimple_simplify (fn, type, arg0, arg1, arg2, |
7185 | seq, gimple_build_valueize); | |
3d2cf79f RB |
7186 | if (!res) |
7187 | { | |
7188 | tree decl = builtin_decl_implicit (fn); | |
355fe088 | 7189 | gimple *stmt = gimple_build_call (decl, 3, arg0, arg1, arg2); |
3d2cf79f RB |
7190 | if (!VOID_TYPE_P (type)) |
7191 | { | |
a15ebbcd | 7192 | res = create_tmp_reg_or_ssa_name (type); |
3d2cf79f RB |
7193 | gimple_call_set_lhs (stmt, res); |
7194 | } | |
7195 | gimple_set_location (stmt, loc); | |
7196 | gimple_seq_add_stmt_without_update (seq, stmt); | |
7197 | } | |
7198 | return res; | |
7199 | } | |
7200 | ||
7201 | /* Build the conversion (TYPE) OP with a result of type TYPE | |
7202 | with location LOC if such conversion is neccesary in GIMPLE, | |
7203 | simplifying it first. | |
7204 | Returns the built expression value and appends | |
7205 | statements possibly defining it to SEQ. */ | |
d4f5cd5e RB |
7206 | |
7207 | tree | |
7208 | gimple_convert (gimple_seq *seq, location_t loc, tree type, tree op) | |
7209 | { | |
7210 | if (useless_type_conversion_p (type, TREE_TYPE (op))) | |
7211 | return op; | |
3d2cf79f | 7212 | return gimple_build (seq, loc, NOP_EXPR, type, op); |
d4f5cd5e | 7213 | } |
68e57f04 | 7214 | |
74e3c262 RB |
7215 | /* Build the conversion (ptrofftype) OP with a result of a type |
7216 | compatible with ptrofftype with location LOC if such conversion | |
7217 | is neccesary in GIMPLE, simplifying it first. | |
7218 | Returns the built expression value and appends | |
7219 | statements possibly defining it to SEQ. */ | |
7220 | ||
7221 | tree | |
7222 | gimple_convert_to_ptrofftype (gimple_seq *seq, location_t loc, tree op) | |
7223 | { | |
7224 | if (ptrofftype_p (TREE_TYPE (op))) | |
7225 | return op; | |
7226 | return gimple_convert (seq, loc, sizetype, op); | |
7227 | } | |
7228 | ||
e7c45b66 RS |
7229 | /* Build a vector of type TYPE in which each element has the value OP. |
7230 | Return a gimple value for the result, appending any new statements | |
7231 | to SEQ. */ | |
7232 | ||
7233 | tree | |
7234 | gimple_build_vector_from_val (gimple_seq *seq, location_t loc, tree type, | |
7235 | tree op) | |
7236 | { | |
928686b1 RS |
7237 | if (!TYPE_VECTOR_SUBPARTS (type).is_constant () |
7238 | && !CONSTANT_CLASS_P (op)) | |
7239 | return gimple_build (seq, loc, VEC_DUPLICATE_EXPR, type, op); | |
7240 | ||
e7c45b66 RS |
7241 | tree res, vec = build_vector_from_val (type, op); |
7242 | if (is_gimple_val (vec)) | |
7243 | return vec; | |
7244 | if (gimple_in_ssa_p (cfun)) | |
7245 | res = make_ssa_name (type); | |
7246 | else | |
7247 | res = create_tmp_reg (type); | |
7248 | gimple *stmt = gimple_build_assign (res, vec); | |
7249 | gimple_set_location (stmt, loc); | |
7250 | gimple_seq_add_stmt_without_update (seq, stmt); | |
7251 | return res; | |
7252 | } | |
7253 | ||
abe73c3d RS |
7254 | /* Build a vector from BUILDER, handling the case in which some elements |
7255 | are non-constant. Return a gimple value for the result, appending any | |
7256 | new instructions to SEQ. | |
7257 | ||
7258 | BUILDER must not have a stepped encoding on entry. This is because | |
7259 | the function is not geared up to handle the arithmetic that would | |
7260 | be needed in the variable case, and any code building a vector that | |
7261 | is known to be constant should use BUILDER->build () directly. */ | |
e7c45b66 RS |
7262 | |
7263 | tree | |
abe73c3d RS |
7264 | gimple_build_vector (gimple_seq *seq, location_t loc, |
7265 | tree_vector_builder *builder) | |
e7c45b66 | 7266 | { |
abe73c3d RS |
7267 | gcc_assert (builder->nelts_per_pattern () <= 2); |
7268 | unsigned int encoded_nelts = builder->encoded_nelts (); | |
7269 | for (unsigned int i = 0; i < encoded_nelts; ++i) | |
7270 | if (!TREE_CONSTANT ((*builder)[i])) | |
e7c45b66 | 7271 | { |
abe73c3d | 7272 | tree type = builder->type (); |
928686b1 | 7273 | unsigned int nelts = TYPE_VECTOR_SUBPARTS (type).to_constant (); |
e7c45b66 RS |
7274 | vec<constructor_elt, va_gc> *v; |
7275 | vec_alloc (v, nelts); | |
7276 | for (i = 0; i < nelts; ++i) | |
abe73c3d | 7277 | CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, builder->elt (i)); |
e7c45b66 RS |
7278 | |
7279 | tree res; | |
7280 | if (gimple_in_ssa_p (cfun)) | |
7281 | res = make_ssa_name (type); | |
7282 | else | |
7283 | res = create_tmp_reg (type); | |
7284 | gimple *stmt = gimple_build_assign (res, build_constructor (type, v)); | |
7285 | gimple_set_location (stmt, loc); | |
7286 | gimple_seq_add_stmt_without_update (seq, stmt); | |
7287 | return res; | |
7288 | } | |
abe73c3d | 7289 | return builder->build (); |
e7c45b66 RS |
7290 | } |
7291 | ||
68e57f04 RS |
7292 | /* Return true if the result of assignment STMT is known to be non-negative. |
7293 | If the return value is based on the assumption that signed overflow is | |
7294 | undefined, set *STRICT_OVERFLOW_P to true; otherwise, don't change | |
7295 | *STRICT_OVERFLOW_P. DEPTH is the current nesting depth of the query. */ | |
7296 | ||
7297 | static bool | |
7298 | gimple_assign_nonnegative_warnv_p (gimple *stmt, bool *strict_overflow_p, | |
7299 | int depth) | |
7300 | { | |
7301 | enum tree_code code = gimple_assign_rhs_code (stmt); | |
7302 | switch (get_gimple_rhs_class (code)) | |
7303 | { | |
7304 | case GIMPLE_UNARY_RHS: | |
7305 | return tree_unary_nonnegative_warnv_p (gimple_assign_rhs_code (stmt), | |
7306 | gimple_expr_type (stmt), | |
7307 | gimple_assign_rhs1 (stmt), | |
7308 | strict_overflow_p, depth); | |
7309 | case GIMPLE_BINARY_RHS: | |
7310 | return tree_binary_nonnegative_warnv_p (gimple_assign_rhs_code (stmt), | |
7311 | gimple_expr_type (stmt), | |
7312 | gimple_assign_rhs1 (stmt), | |
7313 | gimple_assign_rhs2 (stmt), | |
7314 | strict_overflow_p, depth); | |
7315 | case GIMPLE_TERNARY_RHS: | |
7316 | return false; | |
7317 | case GIMPLE_SINGLE_RHS: | |
7318 | return tree_single_nonnegative_warnv_p (gimple_assign_rhs1 (stmt), | |
7319 | strict_overflow_p, depth); | |
7320 | case GIMPLE_INVALID_RHS: | |
7321 | break; | |
7322 | } | |
7323 | gcc_unreachable (); | |
7324 | } | |
7325 | ||
7326 | /* Return true if return value of call STMT is known to be non-negative. | |
7327 | If the return value is based on the assumption that signed overflow is | |
7328 | undefined, set *STRICT_OVERFLOW_P to true; otherwise, don't change | |
7329 | *STRICT_OVERFLOW_P. DEPTH is the current nesting depth of the query. */ | |
7330 | ||
7331 | static bool | |
7332 | gimple_call_nonnegative_warnv_p (gimple *stmt, bool *strict_overflow_p, | |
7333 | int depth) | |
7334 | { | |
7335 | tree arg0 = gimple_call_num_args (stmt) > 0 ? | |
7336 | gimple_call_arg (stmt, 0) : NULL_TREE; | |
7337 | tree arg1 = gimple_call_num_args (stmt) > 1 ? | |
7338 | gimple_call_arg (stmt, 1) : NULL_TREE; | |
7339 | ||
7340 | return tree_call_nonnegative_warnv_p (gimple_expr_type (stmt), | |
1d9da71f | 7341 | gimple_call_combined_fn (stmt), |
68e57f04 RS |
7342 | arg0, |
7343 | arg1, | |
7344 | strict_overflow_p, depth); | |
7345 | } | |
7346 | ||
4534c203 RB |
7347 | /* Return true if return value of call STMT is known to be non-negative. |
7348 | If the return value is based on the assumption that signed overflow is | |
7349 | undefined, set *STRICT_OVERFLOW_P to true; otherwise, don't change | |
7350 | *STRICT_OVERFLOW_P. DEPTH is the current nesting depth of the query. */ | |
7351 | ||
7352 | static bool | |
7353 | gimple_phi_nonnegative_warnv_p (gimple *stmt, bool *strict_overflow_p, | |
7354 | int depth) | |
7355 | { | |
7356 | for (unsigned i = 0; i < gimple_phi_num_args (stmt); ++i) | |
7357 | { | |
7358 | tree arg = gimple_phi_arg_def (stmt, i); | |
7359 | if (!tree_single_nonnegative_warnv_p (arg, strict_overflow_p, depth + 1)) | |
7360 | return false; | |
7361 | } | |
7362 | return true; | |
7363 | } | |
7364 | ||
68e57f04 RS |
7365 | /* Return true if STMT is known to compute a non-negative value. |
7366 | If the return value is based on the assumption that signed overflow is | |
7367 | undefined, set *STRICT_OVERFLOW_P to true; otherwise, don't change | |
7368 | *STRICT_OVERFLOW_P. DEPTH is the current nesting depth of the query. */ | |
7369 | ||
7370 | bool | |
7371 | gimple_stmt_nonnegative_warnv_p (gimple *stmt, bool *strict_overflow_p, | |
7372 | int depth) | |
7373 | { | |
7374 | switch (gimple_code (stmt)) | |
7375 | { | |
7376 | case GIMPLE_ASSIGN: | |
7377 | return gimple_assign_nonnegative_warnv_p (stmt, strict_overflow_p, | |
7378 | depth); | |
7379 | case GIMPLE_CALL: | |
7380 | return gimple_call_nonnegative_warnv_p (stmt, strict_overflow_p, | |
7381 | depth); | |
4534c203 RB |
7382 | case GIMPLE_PHI: |
7383 | return gimple_phi_nonnegative_warnv_p (stmt, strict_overflow_p, | |
7384 | depth); | |
68e57f04 RS |
7385 | default: |
7386 | return false; | |
7387 | } | |
7388 | } | |
67dbe582 RS |
7389 | |
7390 | /* Return true if the floating-point value computed by assignment STMT | |
7391 | is known to have an integer value. We also allow +Inf, -Inf and NaN | |
5a00b0aa | 7392 | to be considered integer values. Return false for signaling NaN. |
67dbe582 RS |
7393 | |
7394 | DEPTH is the current nesting depth of the query. */ | |
7395 | ||
7396 | static bool | |
7397 | gimple_assign_integer_valued_real_p (gimple *stmt, int depth) | |
7398 | { | |
7399 | enum tree_code code = gimple_assign_rhs_code (stmt); | |
7400 | switch (get_gimple_rhs_class (code)) | |
7401 | { | |
7402 | case GIMPLE_UNARY_RHS: | |
7403 | return integer_valued_real_unary_p (gimple_assign_rhs_code (stmt), | |
7404 | gimple_assign_rhs1 (stmt), depth); | |
7405 | case GIMPLE_BINARY_RHS: | |
7406 | return integer_valued_real_binary_p (gimple_assign_rhs_code (stmt), | |
7407 | gimple_assign_rhs1 (stmt), | |
7408 | gimple_assign_rhs2 (stmt), depth); | |
7409 | case GIMPLE_TERNARY_RHS: | |
7410 | return false; | |
7411 | case GIMPLE_SINGLE_RHS: | |
7412 | return integer_valued_real_single_p (gimple_assign_rhs1 (stmt), depth); | |
7413 | case GIMPLE_INVALID_RHS: | |
7414 | break; | |
7415 | } | |
7416 | gcc_unreachable (); | |
7417 | } | |
7418 | ||
7419 | /* Return true if the floating-point value computed by call STMT is known | |
7420 | to have an integer value. We also allow +Inf, -Inf and NaN to be | |
5a00b0aa | 7421 | considered integer values. Return false for signaling NaN. |
67dbe582 RS |
7422 | |
7423 | DEPTH is the current nesting depth of the query. */ | |
7424 | ||
7425 | static bool | |
7426 | gimple_call_integer_valued_real_p (gimple *stmt, int depth) | |
7427 | { | |
7428 | tree arg0 = (gimple_call_num_args (stmt) > 0 | |
7429 | ? gimple_call_arg (stmt, 0) | |
7430 | : NULL_TREE); | |
7431 | tree arg1 = (gimple_call_num_args (stmt) > 1 | |
7432 | ? gimple_call_arg (stmt, 1) | |
7433 | : NULL_TREE); | |
1d9da71f | 7434 | return integer_valued_real_call_p (gimple_call_combined_fn (stmt), |
67dbe582 RS |
7435 | arg0, arg1, depth); |
7436 | } | |
7437 | ||
7438 | /* Return true if the floating-point result of phi STMT is known to have | |
7439 | an integer value. We also allow +Inf, -Inf and NaN to be considered | |
5a00b0aa | 7440 | integer values. Return false for signaling NaN. |
67dbe582 RS |
7441 | |
7442 | DEPTH is the current nesting depth of the query. */ | |
7443 | ||
7444 | static bool | |
7445 | gimple_phi_integer_valued_real_p (gimple *stmt, int depth) | |
7446 | { | |
7447 | for (unsigned i = 0; i < gimple_phi_num_args (stmt); ++i) | |
7448 | { | |
7449 | tree arg = gimple_phi_arg_def (stmt, i); | |
7450 | if (!integer_valued_real_single_p (arg, depth + 1)) | |
7451 | return false; | |
7452 | } | |
7453 | return true; | |
7454 | } | |
7455 | ||
7456 | /* Return true if the floating-point value computed by STMT is known | |
7457 | to have an integer value. We also allow +Inf, -Inf and NaN to be | |
5a00b0aa | 7458 | considered integer values. Return false for signaling NaN. |
67dbe582 RS |
7459 | |
7460 | DEPTH is the current nesting depth of the query. */ | |
7461 | ||
7462 | bool | |
7463 | gimple_stmt_integer_valued_real_p (gimple *stmt, int depth) | |
7464 | { | |
7465 | switch (gimple_code (stmt)) | |
7466 | { | |
7467 | case GIMPLE_ASSIGN: | |
7468 | return gimple_assign_integer_valued_real_p (stmt, depth); | |
7469 | case GIMPLE_CALL: | |
7470 | return gimple_call_integer_valued_real_p (stmt, depth); | |
7471 | case GIMPLE_PHI: | |
7472 | return gimple_phi_integer_valued_real_p (stmt, depth); | |
7473 | default: | |
7474 | return false; | |
7475 | } | |
7476 | } |