Line data Source code
1 : /* Support routines for Value Range Propagation (VRP).
2 : Copyright (C) 2005-2026 Free Software Foundation, Inc.
3 :
4 : This file is part of GCC.
5 :
6 : GCC is free software; you can redistribute it and/or modify
7 : it under the terms of the GNU General Public License as published by
8 : the Free Software Foundation; either version 3, or (at your option)
9 : any later version.
10 :
11 : GCC is distributed in the hope that it will be useful,
12 : but WITHOUT ANY WARRANTY; without even the implied warranty of
13 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 : GNU General Public License for more details.
15 :
16 : You should have received a copy of the GNU General Public License
17 : along with GCC; see the file COPYING3. If not see
18 : <http://www.gnu.org/licenses/>. */
19 :
20 : #include "config.h"
21 : #include "system.h"
22 : #include "coretypes.h"
23 : #include "backend.h"
24 : #include "insn-codes.h"
25 : #include "tree.h"
26 : #include "gimple.h"
27 : #include "ssa.h"
28 : #include "optabs-tree.h"
29 : #include "gimple-pretty-print.h"
30 : #include "diagnostic-core.h"
31 : #include "flags.h"
32 : #include "fold-const.h"
33 : #include "calls.h"
34 : #include "cfganal.h"
35 : #include "gimple-iterator.h"
36 : #include "gimple-fold.h"
37 : #include "tree-cfg.h"
38 : #include "tree-ssa-loop-niter.h"
39 : #include "tree-ssa-loop.h"
40 : #include "intl.h"
41 : #include "cfgloop.h"
42 : #include "tree-scalar-evolution.h"
43 : #include "tree-ssa-propagate.h"
44 : #include "tree-chrec.h"
45 : #include "omp-general.h"
46 : #include "case-cfn-macros.h"
47 : #include "alloc-pool.h"
48 : #include "attribs.h"
49 : #include "range.h"
50 : #include "vr-values.h"
51 : #include "cfghooks.h"
52 : #include "range-op.h"
53 : #include "gimple-range.h"
54 :
55 : /* Return true if op is in a boolean [0, 1] value-range. */
56 :
57 : bool
58 462467 : simplify_using_ranges::op_with_boolean_value_range_p (tree op, gimple *s)
59 : {
60 462467 : if (TYPE_PRECISION (TREE_TYPE (op)) == 1)
61 : return true;
62 :
63 450367 : if (integer_zerop (op)
64 450367 : || integer_onep (op))
65 8548 : return true;
66 :
67 441819 : if (TREE_CODE (op) != SSA_NAME)
68 : return false;
69 :
70 : /* ?? Errr, this should probably check for [0,0] and [1,1] as well
71 : as [0,1]. */
72 441819 : int_range_max vr;
73 441819 : return (query->range_of_expr (vr, op, s)
74 441819 : && vr == range_true_and_false (TREE_TYPE (op)));
75 441819 : }
76 :
77 : /* Helper function for simplify_internal_call_using_ranges and
78 : extract_range_basic. Return true if OP0 SUBCODE OP1 for
79 : SUBCODE {PLUS,MINUS,MULT}_EXPR is known to never overflow or
80 : always overflow. Set *OVF to true if it is known to always
81 : overflow. */
82 :
83 : static bool
84 143406 : check_for_binary_op_overflow (range_query *query,
85 : enum tree_code subcode, tree type,
86 : tree op0, tree op1, bool *ovf, gimple *s = NULL)
87 : {
88 143406 : relation_kind rel = VREL_VARYING;
89 : /* For subtraction see if relations could simplify it. */
90 143406 : if (s
91 143406 : && subcode == MINUS_EXPR
92 143406 : && types_compatible_p (TREE_TYPE (op0), TREE_TYPE (op1)))
93 : {
94 28915 : rel = query->relation().query (s, op0, op1);
95 : /* The result of the infinite precision subtraction of
96 : the same values will be always 0. That will fit into any result
97 : type. */
98 28915 : if (rel == VREL_EQ)
99 : return true;
100 : }
101 :
102 143405 : int_range_max vr0, vr1;
103 143405 : if (!query->range_of_expr (vr0, op0, s) || vr0.undefined_p ())
104 12 : vr0.set_varying (TREE_TYPE (op0));
105 143405 : if (!query->range_of_expr (vr1, op1, s) || vr1.undefined_p ())
106 0 : vr1.set_varying (TREE_TYPE (op1));
107 :
108 143405 : tree vr0min = wide_int_to_tree (TREE_TYPE (op0), vr0.lower_bound ());
109 143405 : tree vr0max = wide_int_to_tree (TREE_TYPE (op0), vr0.upper_bound ());
110 143405 : tree vr1min = wide_int_to_tree (TREE_TYPE (op1), vr1.lower_bound ());
111 143405 : tree vr1max = wide_int_to_tree (TREE_TYPE (op1), vr1.upper_bound ());
112 :
113 : /* If op1 is not negative, op0 - op1 in infinite precision for op0 >= op1
114 : will be always in [0, op0] and so if vr0max - vr1min fits into type,
115 : there won't be any overflow. */
116 143405 : if ((rel == VREL_GT || rel == VREL_GE)
117 20 : && tree_int_cst_sgn (vr1min) >= 0
118 143422 : && !arith_overflowed_p (MINUS_EXPR, type, vr0max, vr1min))
119 : return true;
120 :
121 : /* If op1 is not negative, op0 - op1 in infinite precision for op0 < op1
122 : will be always in [-inf, -1] and so will always overflow if type is
123 : unsigned. */
124 143388 : if (rel == VREL_LT
125 1 : && tree_int_cst_sgn (vr1min) >= 0
126 143389 : && TYPE_UNSIGNED (type))
127 : {
128 1 : *ovf = true;
129 1 : return true;
130 : }
131 :
132 235063 : *ovf = arith_overflowed_p (subcode, type, vr0min,
133 : subcode == MINUS_EXPR ? vr1max : vr1min);
134 235063 : if (arith_overflowed_p (subcode, type, vr0max,
135 143387 : subcode == MINUS_EXPR ? vr1min : vr1max) != *ovf)
136 : return false;
137 39156 : if (subcode == MULT_EXPR)
138 : {
139 23688 : if (arith_overflowed_p (subcode, type, vr0min, vr1max) != *ovf
140 23688 : || arith_overflowed_p (subcode, type, vr0max, vr1min) != *ovf)
141 376 : return false;
142 : }
143 38780 : if (*ovf)
144 : {
145 : /* So far we found that there is an overflow on the boundaries.
146 : That doesn't prove that there is an overflow even for all values
147 : in between the boundaries. For that compute widest2_int range
148 : of the result and see if it doesn't overlap the range of
149 : type. */
150 36786 : widest2_int wmin, wmax;
151 331112 : widest2_int w[4];
152 36786 : int i;
153 36786 : signop sign0 = TYPE_SIGN (TREE_TYPE (op0));
154 36786 : signop sign1 = TYPE_SIGN (TREE_TYPE (op1));
155 36800 : w[0] = widest2_int::from (vr0.lower_bound (), sign0);
156 36800 : w[1] = widest2_int::from (vr0.upper_bound (), sign0);
157 36791 : w[2] = widest2_int::from (vr1.lower_bound (), sign1);
158 36791 : w[3] = widest2_int::from (vr1.upper_bound (), sign1);
159 183930 : for (i = 0; i < 4; i++)
160 : {
161 147144 : widest2_int wt;
162 147144 : switch (subcode)
163 : {
164 26864 : case PLUS_EXPR:
165 26864 : wt = wi::add (w[i & 1], w[2 + (i & 2) / 2]);
166 26864 : break;
167 27680 : case MINUS_EXPR:
168 27680 : wt = wi::sub (w[i & 1], w[2 + (i & 2) / 2]);
169 27680 : break;
170 92600 : case MULT_EXPR:
171 92600 : wt = wi::mul (w[i & 1], w[2 + (i & 2) / 2]);
172 92600 : break;
173 0 : default:
174 0 : gcc_unreachable ();
175 : }
176 147144 : if (i == 0)
177 : {
178 36786 : wmin = wt;
179 36786 : wmax = wt;
180 : }
181 : else
182 : {
183 110358 : wmin = wi::smin (wmin, wt);
184 111014 : wmax = wi::smax (wmax, wt);
185 : }
186 147144 : }
187 : /* The result of op0 CODE op1 is known to be in range
188 : [wmin, wmax]. */
189 36786 : widest2_int wtmin
190 73572 : = widest2_int::from (irange_val_min (type), TYPE_SIGN (type));
191 36786 : widest2_int wtmax
192 73572 : = widest2_int::from (irange_val_max (type), TYPE_SIGN (type));
193 : /* If all values in [wmin, wmax] are smaller than
194 : [wtmin, wtmax] or all are larger than [wtmin, wtmax],
195 : the arithmetic operation will always overflow. */
196 72562 : if (wmax < wtmin || wmin > wtmax)
197 1661 : return true;
198 : return false;
199 220926 : }
200 : return true;
201 143405 : }
202 :
203 : /* Set INIT, STEP, and DIRECTION to the corresponding values of NAME
204 : within LOOP, and return TRUE. Otherwise return FALSE, and set R to
205 : the conservative range of NAME within the loop. */
206 :
207 : static bool
208 6671419 : get_scev_info (vrange &r, tree name, gimple *stmt, class loop *l,
209 : tree &init, tree &step, enum ev_direction &dir)
210 : {
211 6671419 : tree ev = analyze_scalar_evolution (l, name);
212 6671419 : tree chrec = instantiate_parameters (l, ev);
213 6671419 : tree type = TREE_TYPE (name);
214 6671419 : if (TREE_CODE (chrec) != POLYNOMIAL_CHREC)
215 : {
216 3178289 : r.set_varying (type);
217 3178289 : return false;
218 : }
219 3493130 : if (is_gimple_min_invariant (chrec))
220 : {
221 0 : if (is_gimple_constant (chrec))
222 0 : r.set (chrec, chrec);
223 : else
224 0 : r.set_varying (type);
225 0 : return false;
226 : }
227 :
228 3493130 : init = initial_condition_in_loop_num (chrec, l->num);
229 3493130 : step = evolution_part_in_loop_num (chrec, l->num);
230 3493130 : if (!init || !step)
231 : {
232 0 : r.set_varying (type);
233 0 : return false;
234 : }
235 3493130 : dir = scev_direction (chrec);
236 3493130 : if (dir == EV_DIR_UNKNOWN
237 3493130 : || scev_probably_wraps_p (NULL, init, step, stmt,
238 : get_chrec_loop (chrec), true))
239 : {
240 788557 : r.set_varying (type);
241 788557 : return false;
242 : }
243 : return true;
244 : }
245 :
246 : /* Return TRUE if STEP * NIT may overflow when calculated in TYPE. */
247 :
248 : static bool
249 2265471 : induction_variable_may_overflow_p (tree type,
250 : const wide_int &step, const widest_int &nit)
251 : {
252 2265471 : wi::overflow_type ovf;
253 2265471 : signop sign = TYPE_SIGN (type);
254 2265471 : widest_int max_step = wi::mul (widest_int::from (step, sign),
255 2265471 : nit, sign, &ovf);
256 :
257 2265471 : if (ovf || !wi::fits_to_tree_p (max_step, type))
258 112987 : return true;
259 :
260 : /* For a signed type we have to check whether the result has the
261 : expected signedness which is that of the step as number of
262 : iterations is unsigned. */
263 2152484 : return (sign == SIGNED
264 4304390 : && wi::gts_p (max_step, 0) != wi::gts_p (step, 0));
265 2265471 : }
266 :
267 : /* Set R to the range from BEGIN to END, assuming the direction of the
268 : loop is DIR. */
269 :
270 : static void
271 2702109 : range_from_loop_direction (irange &r, tree type,
272 : const irange &begin, const irange &end,
273 : ev_direction dir)
274 : {
275 2702109 : signop sign = TYPE_SIGN (type);
276 :
277 2702109 : if (begin.undefined_p () || end.undefined_p ())
278 2887 : r.set_varying (type);
279 2699222 : else if (dir == EV_DIR_GROWS)
280 : {
281 2425488 : if (wi::ge_p (begin.lower_bound (), end.upper_bound (), sign))
282 470 : r.set_varying (type);
283 : else
284 2425018 : r = int_range<1> (type, begin.lower_bound (), end.upper_bound ());
285 : }
286 : else
287 : {
288 273746 : if (wi::ge_p (end.lower_bound (), begin.upper_bound (), sign))
289 259 : r.set_varying (type);
290 : else
291 273487 : r = int_range<1> (type, end.lower_bound (), begin.upper_bound ());
292 : }
293 2702109 : }
294 :
295 : /* Set V to the range of NAME in STMT within LOOP. Return TRUE if a
296 : range was found. */
297 :
298 : bool
299 6671419 : range_of_var_in_loop (vrange &v, tree name, class loop *l, gimple *stmt,
300 : range_query *query)
301 : {
302 6671419 : tree init, step;
303 6671419 : enum ev_direction dir;
304 6671419 : if (!get_scev_info (v, name, stmt, l, init, step, dir))
305 : return true;
306 :
307 : // Calculate ranges for the values from SCEV.
308 2704573 : irange &r = as_a <irange> (v);
309 2704573 : tree type = TREE_TYPE (init);
310 2704573 : int_range<2> rinit (type), rstep (type), max_init (type);
311 2704573 : if (!query->range_of_expr (rinit, init, stmt)
312 2704573 : || !query->range_of_expr (rstep, step, stmt))
313 0 : return false;
314 :
315 : // Calculate the final range of NAME if possible.
316 2704573 : if (rinit.singleton_p () && rstep.singleton_p ())
317 : {
318 2267935 : widest_int nit;
319 2267935 : if (!max_loop_iterations (l, &nit))
320 : return false;
321 :
322 2265471 : if (!induction_variable_may_overflow_p (type, rstep.lower_bound (), nit))
323 : {
324 : // Calculate the max bounds for init (init + niter * step).
325 2151906 : wide_int w = wide_int::from (nit, TYPE_PRECISION (type), TYPE_SIGN (type));
326 2151906 : int_range<1> niter (type, w, w);
327 2151906 : int_range_max max_step;
328 2151906 : range_op_handler mult_handler (MULT_EXPR);
329 2151906 : range_op_handler plus_handler (PLUS_EXPR);
330 2151906 : if (!mult_handler.fold_range (max_step, type, niter, rstep)
331 2151906 : || !plus_handler.fold_range (max_init, type, rinit, max_step))
332 0 : return false;
333 2151906 : }
334 2267935 : }
335 2702109 : range_from_loop_direction (r, type, rinit, max_init, dir);
336 2702109 : return true;
337 2704573 : }
338 :
339 : /* Helper function for vrp_evaluate_conditional_warnv & other
340 : optimizers. */
341 :
342 : tree
343 20539620 : simplify_using_ranges::fold_cond_with_ops (enum tree_code code,
344 : tree op0, tree op1, gimple *s)
345 : {
346 20539620 : value_range r0 (TREE_TYPE (op0));
347 20539620 : value_range r1 (TREE_TYPE (op1));
348 20539620 : if (!query->range_of_expr (r0, op0, s)
349 20539620 : || !query->range_of_expr (r1, op1, s))
350 6102 : return NULL_TREE;
351 :
352 20533518 : int_range<1> res;
353 20533518 : range_op_handler handler (code);
354 :
355 : // Find any relation between op0 and op1 and pass it to fold_range.
356 20533518 : relation_kind rel = VREL_VARYING;
357 20533518 : if (gimple_range_ssa_p (op0) && gimple_range_ssa_p (op1))
358 4598317 : rel = query->relation ().query (s, op0, op1);
359 :
360 20533518 : if (handler && handler.fold_range (res, boolean_type_node, r0, r1,
361 : relation_trio::op1_op2 (rel)))
362 : {
363 20533518 : if (res == range_true ())
364 9743 : return boolean_true_node;
365 20523775 : if (res == range_false ())
366 4903 : return boolean_false_node;
367 : }
368 : return NULL;
369 20539620 : }
370 :
371 : /* Helper function for legacy_fold_cond. */
372 :
373 : tree
374 20924303 : simplify_using_ranges::legacy_fold_cond_overflow (gimple *stmt)
375 : {
376 20924303 : tree ret;
377 20924303 : tree_code code = gimple_cond_code (stmt);
378 20924303 : tree op0 = gimple_cond_lhs (stmt);
379 20924303 : tree op1 = gimple_cond_rhs (stmt);
380 :
381 : /* We only deal with integral and pointer types. */
382 41476933 : if (!INTEGRAL_TYPE_P (TREE_TYPE (op0))
383 25571351 : && !POINTER_TYPE_P (TREE_TYPE (op0)))
384 : return NULL_TREE;
385 :
386 : /* If OP0 CODE OP1 is an overflow comparison, if it can be expressed
387 : as a simple equality test, then prefer that over its current form
388 : for evaluation.
389 :
390 : An overflow test which collapses to an equality test can always be
391 : expressed as a comparison of one argument against zero. Overflow
392 : occurs when the chosen argument is zero and does not occur if the
393 : chosen argument is not zero. */
394 20086105 : tree x;
395 20086105 : if (overflow_comparison_p (code, op0, op1, &x))
396 : {
397 1364 : wide_int max = wi::max_value (TYPE_PRECISION (TREE_TYPE (op0)), UNSIGNED);
398 : /* B = A - 1; if (A < B) -> B = A - 1; if (A == 0)
399 : B = A - 1; if (A > B) -> B = A - 1; if (A != 0)
400 : B = A + 1; if (B < A) -> B = A + 1; if (B == 0)
401 : B = A + 1; if (B > A) -> B = A + 1; if (B != 0) */
402 1364 : if (integer_zerop (x))
403 : {
404 208 : op1 = x;
405 208 : code = (code == LT_EXPR || code == LE_EXPR) ? EQ_EXPR : NE_EXPR;
406 : }
407 : /* B = A + 1; if (A > B) -> B = A + 1; if (B == 0)
408 : B = A + 1; if (A < B) -> B = A + 1; if (B != 0)
409 : B = A - 1; if (B > A) -> B = A - 1; if (A == 0)
410 : B = A - 1; if (B < A) -> B = A - 1; if (A != 0) */
411 1156 : else if (wi::to_wide (x) == max - 1)
412 : {
413 815 : op0 = op1;
414 815 : op1 = wide_int_to_tree (TREE_TYPE (op0), 0);
415 815 : code = (code == GT_EXPR || code == GE_EXPR) ? EQ_EXPR : NE_EXPR;
416 : }
417 : else
418 : {
419 341 : int_range_max vro, vri;
420 341 : tree type = TREE_TYPE (op0);
421 341 : if (code == GT_EXPR || code == GE_EXPR)
422 : {
423 119 : vro.set (type,
424 238 : wi::to_wide (TYPE_MIN_VALUE (type)),
425 119 : wi::to_wide (x), VR_ANTI_RANGE);
426 119 : vri.set (type,
427 238 : wi::to_wide (TYPE_MIN_VALUE (type)),
428 238 : wi::to_wide (x));
429 : }
430 222 : else if (code == LT_EXPR || code == LE_EXPR)
431 : {
432 222 : vro.set (type,
433 444 : wi::to_wide (TYPE_MIN_VALUE (type)),
434 222 : wi::to_wide (x));
435 222 : vri.set (type,
436 444 : wi::to_wide (TYPE_MIN_VALUE (type)),
437 444 : wi::to_wide (x),
438 : VR_ANTI_RANGE);
439 : }
440 : else
441 0 : gcc_unreachable ();
442 341 : int_range_max vr0;
443 341 : if (!query->range_of_expr (vr0, op0, stmt))
444 0 : vr0.set_varying (TREE_TYPE (op0));
445 : /* If vro, the range for OP0 to pass the overflow test, has
446 : no intersection with *vr0, OP0's known range, then the
447 : overflow test can't pass, so return the node for false.
448 : If it is the inverted range, vri, that has no
449 : intersection, then the overflow test must pass, so return
450 : the node for true. In other cases, we could proceed with
451 : a simplified condition comparing OP0 and X, with LE_EXPR
452 : for previously LE_ or LT_EXPR and GT_EXPR otherwise, but
453 : the comments next to the enclosing if suggest it's not
454 : generally profitable to do so. */
455 341 : vro.intersect (vr0);
456 341 : if (vro.undefined_p ())
457 8 : return boolean_false_node;
458 333 : vri.intersect (vr0);
459 333 : if (vri.undefined_p ())
460 0 : return boolean_true_node;
461 341 : }
462 1364 : }
463 :
464 20086097 : if ((ret = fold_cond_with_ops (code, op0, op1, stmt)))
465 : return ret;
466 : return NULL_TREE;
467 : }
468 :
469 : /* Visit conditional statement STMT. If we can determine which edge
470 : will be taken out of STMT's basic block, record it in
471 : *TAKEN_EDGE_P. Otherwise, set *TAKEN_EDGE_P to NULL. */
472 :
473 : void
474 20924303 : simplify_using_ranges::legacy_fold_cond (gcond *stmt, edge *taken_edge_p)
475 : {
476 20924303 : tree val;
477 :
478 20924303 : *taken_edge_p = NULL;
479 :
480 20924303 : if (dump_file && (dump_flags & TDF_DETAILS))
481 : {
482 383 : tree use;
483 383 : ssa_op_iter i;
484 :
485 383 : fprintf (dump_file, "\nVisiting conditional with predicate: ");
486 383 : print_gimple_stmt (dump_file, stmt, 0);
487 383 : fprintf (dump_file, "\nWith known ranges\n");
488 :
489 856 : FOR_EACH_SSA_TREE_OPERAND (use, stmt, i, SSA_OP_USE)
490 : {
491 473 : fprintf (dump_file, "\t");
492 473 : print_generic_expr (dump_file, use);
493 473 : fprintf (dump_file, ": ");
494 473 : value_range r (TREE_TYPE (use));
495 473 : query->range_of_expr (r, use, stmt);
496 473 : r.dump (dump_file);
497 473 : }
498 :
499 383 : fprintf (dump_file, "\n");
500 : }
501 :
502 20924303 : val = legacy_fold_cond_overflow (stmt);
503 20924303 : if (val)
504 8 : *taken_edge_p = find_taken_edge (gimple_bb (stmt), val);
505 :
506 20924303 : if (dump_file && (dump_flags & TDF_DETAILS))
507 : {
508 383 : fprintf (dump_file, "\nPredicate evaluates to: ");
509 383 : if (val == NULL_TREE)
510 383 : fprintf (dump_file, "DON'T KNOW\n");
511 : else
512 0 : print_generic_stmt (dump_file, val);
513 : }
514 20924303 : }
515 :
516 : /* Simplify boolean operations if the source is known
517 : to be already a boolean. */
518 : bool
519 447361 : simplify_using_ranges::simplify_truth_ops_using_ranges
520 : (gimple_stmt_iterator *gsi,
521 : gimple *stmt)
522 : {
523 447361 : enum tree_code rhs_code = gimple_assign_rhs_code (stmt);
524 447361 : tree lhs, op0, op1;
525 447361 : bool need_conversion;
526 :
527 : /* We handle only !=/== case here. */
528 447361 : gcc_assert (rhs_code == EQ_EXPR || rhs_code == NE_EXPR);
529 :
530 447361 : op0 = gimple_assign_rhs1 (stmt);
531 447361 : if (!op_with_boolean_value_range_p (op0, stmt))
532 : return false;
533 :
534 15106 : op1 = gimple_assign_rhs2 (stmt);
535 15106 : if (!op_with_boolean_value_range_p (op1, stmt))
536 : return false;
537 :
538 : /* Reduce number of cases to handle to NE_EXPR. As there is no
539 : BIT_XNOR_EXPR we cannot replace A == B with a single statement. */
540 14667 : if (rhs_code == EQ_EXPR)
541 : {
542 6670 : if (TREE_CODE (op1) == INTEGER_CST)
543 2382 : op1 = int_const_binop (BIT_XOR_EXPR, op1,
544 4764 : build_int_cst (TREE_TYPE (op1), 1));
545 : else
546 : return false;
547 : }
548 :
549 10379 : lhs = gimple_assign_lhs (stmt);
550 10379 : need_conversion
551 10379 : = !useless_type_conversion_p (TREE_TYPE (lhs), TREE_TYPE (op0));
552 :
553 : /* Make sure to not sign-extend a 1-bit 1 when converting the result. */
554 10379 : if (need_conversion
555 9031 : && !TYPE_UNSIGNED (TREE_TYPE (op0))
556 3679 : && TYPE_PRECISION (TREE_TYPE (op0)) == 1
557 10402 : && TYPE_PRECISION (TREE_TYPE (lhs)) > 1)
558 : return false;
559 :
560 : /* For A != 0 we can substitute A itself. */
561 10379 : if (integer_zerop (op1))
562 6945 : gimple_assign_set_rhs_with_ops (gsi,
563 : need_conversion
564 0 : ? NOP_EXPR : TREE_CODE (op0), op0);
565 : /* For A != B we substitute A ^ B. Either with conversion. */
566 3434 : else if (need_conversion)
567 : {
568 2086 : tree tem = make_ssa_name (TREE_TYPE (op0));
569 2086 : gassign *newop
570 2086 : = gimple_build_assign (tem, BIT_XOR_EXPR, op0, op1);
571 2086 : gsi_insert_before (gsi, newop, GSI_SAME_STMT);
572 4144 : if (INTEGRAL_TYPE_P (TREE_TYPE (tem))
573 4144 : && TYPE_PRECISION (TREE_TYPE (tem)) > 1)
574 : {
575 3988 : int_range<1> vr (TREE_TYPE (tem),
576 3988 : wi::zero (TYPE_PRECISION (TREE_TYPE (tem))),
577 3988 : wi::one (TYPE_PRECISION (TREE_TYPE (tem))));
578 1994 : set_range_info (tem, vr);
579 1994 : }
580 2086 : gimple_assign_set_rhs_with_ops (gsi, NOP_EXPR, tem);
581 : }
582 : /* Or without. */
583 : else
584 1348 : gimple_assign_set_rhs_with_ops (gsi, BIT_XOR_EXPR, op0, op1);
585 10379 : update_stmt (gsi_stmt (*gsi));
586 10379 : fold_stmt (gsi, follow_single_use_edges);
587 :
588 10379 : return true;
589 : }
590 :
591 : /* Simplify a division or modulo operator to a right shift or bitwise and
592 : if the first operand is unsigned or is greater than zero and the second
593 : operand is an exact power of two. For TRUNC_MOD_EXPR op0 % op1 with
594 : constant op1 (op1min = op1) or with op1 in [op1min, op1max] range,
595 : optimize it into just op0 if op0's range is known to be a subset of
596 : [-op1min + 1, op1min - 1] for signed and [0, op1min - 1] for unsigned
597 : modulo. */
598 :
599 : bool
600 315950 : simplify_using_ranges::simplify_div_or_mod_using_ranges
601 : (gimple_stmt_iterator *gsi,
602 : gimple *stmt)
603 : {
604 315950 : enum tree_code rhs_code = gimple_assign_rhs_code (stmt);
605 315950 : tree val = NULL;
606 315950 : tree op0 = gimple_assign_rhs1 (stmt);
607 315950 : tree op1 = gimple_assign_rhs2 (stmt);
608 315950 : tree op0min = NULL_TREE, op0max = NULL_TREE;
609 315950 : tree op1min = op1;
610 315950 : int_range_max vr;
611 :
612 315950 : if (TREE_CODE (op0) == INTEGER_CST)
613 : {
614 : op0min = op0;
615 : op0max = op0;
616 : }
617 : else
618 : {
619 291053 : if (!query->range_of_expr (vr, op0, stmt))
620 0 : vr.set_varying (TREE_TYPE (op0));
621 291053 : if (!vr.varying_p () && !vr.undefined_p ())
622 : {
623 138977 : tree type = vr.type ();
624 138977 : op0min = wide_int_to_tree (type, vr.lower_bound ());
625 138986 : op0max = wide_int_to_tree (type, vr.upper_bound ());
626 : }
627 : }
628 :
629 315950 : if (rhs_code == TRUNC_MOD_EXPR
630 146646 : && TREE_CODE (op1) == SSA_NAME)
631 : {
632 90632 : int_range_max vr1;
633 90632 : if (!query->range_of_expr (vr1, op1, stmt))
634 0 : vr1.set_varying (TREE_TYPE (op1));
635 90632 : if (!vr1.varying_p () && !vr1.undefined_p ())
636 26001 : op1min = wide_int_to_tree (vr1.type (), vr1.lower_bound ());
637 90632 : }
638 146646 : if (rhs_code == TRUNC_MOD_EXPR
639 146646 : && TREE_CODE (op1min) == INTEGER_CST
640 82011 : && tree_int_cst_sgn (op1min) == 1
641 61209 : && op0max
642 35442 : && tree_int_cst_lt (op0max, op1min))
643 : {
644 1221 : if (TYPE_UNSIGNED (TREE_TYPE (op0))
645 541 : || tree_int_cst_sgn (op0min) >= 0
646 1450 : || tree_int_cst_lt (fold_unary (NEGATE_EXPR, TREE_TYPE (op1min), op1min),
647 : op0min))
648 : {
649 : /* If op0 already has the range op0 % op1 has,
650 : then TRUNC_MOD_EXPR won't change anything. */
651 1188 : gimple_assign_set_rhs_from_tree (gsi, op0);
652 1188 : return true;
653 : }
654 : }
655 :
656 314762 : if (TREE_CODE (op0) != SSA_NAME)
657 : return false;
658 :
659 289878 : if (!integer_pow2p (op1))
660 : {
661 : /* X % -Y can be only optimized into X % Y either if
662 : X is not INT_MIN, or Y is not -1. Fold it now, as after
663 : remove_range_assertions the range info might be not available
664 : anymore. */
665 250660 : if (rhs_code == TRUNC_MOD_EXPR
666 250660 : && fold_stmt (gsi, follow_single_use_edges))
667 : return true;
668 250648 : return false;
669 : }
670 :
671 39218 : if (TYPE_UNSIGNED (TREE_TYPE (op0)))
672 0 : val = integer_one_node;
673 : else
674 : {
675 39218 : tree zero = build_zero_cst (TREE_TYPE (op0));
676 39218 : val = fold_cond_with_ops (GE_EXPR, op0, zero, stmt);
677 : }
678 :
679 39218 : if (val && integer_onep (val))
680 : {
681 6661 : tree t;
682 :
683 6661 : if (rhs_code == TRUNC_DIV_EXPR)
684 : {
685 4288 : t = build_int_cst (integer_type_node, tree_log2 (op1));
686 4288 : gimple_assign_set_rhs_code (stmt, RSHIFT_EXPR);
687 4288 : gimple_assign_set_rhs1 (stmt, op0);
688 4288 : gimple_assign_set_rhs2 (stmt, t);
689 : }
690 : else
691 : {
692 2373 : t = build_int_cst (TREE_TYPE (op1), 1);
693 2373 : t = int_const_binop (MINUS_EXPR, op1, t);
694 2373 : t = fold_convert (TREE_TYPE (op0), t);
695 :
696 2373 : gimple_assign_set_rhs_code (stmt, BIT_AND_EXPR);
697 2373 : gimple_assign_set_rhs1 (stmt, op0);
698 2373 : gimple_assign_set_rhs2 (stmt, t);
699 : }
700 :
701 6661 : update_stmt (stmt);
702 6661 : fold_stmt (gsi, follow_single_use_edges);
703 6661 : return true;
704 : }
705 :
706 : return false;
707 315950 : }
708 :
709 : /* Simplify a min or max if the ranges of the two operands are
710 : disjoint. Return true if we do simplify. */
711 :
712 : bool
713 203189 : simplify_using_ranges::simplify_min_or_max_using_ranges
714 : (gimple_stmt_iterator *gsi,
715 : gimple *stmt)
716 : {
717 203189 : tree op0 = gimple_assign_rhs1 (stmt);
718 203189 : tree op1 = gimple_assign_rhs2 (stmt);
719 203189 : tree val;
720 :
721 203189 : val = fold_cond_with_ops (LE_EXPR, op0, op1, stmt);
722 203189 : if (!val)
723 196639 : val = fold_cond_with_ops (LT_EXPR, op0, op1, stmt);
724 :
725 196639 : if (val)
726 : {
727 : /* VAL == TRUE -> OP0 < or <= op1
728 : VAL == FALSE -> OP0 > or >= op1. */
729 7550 : tree res = ((gimple_assign_rhs_code (stmt) == MAX_EXPR)
730 7550 : == integer_zerop (val)) ? op0 : op1;
731 7550 : gimple_assign_set_rhs_from_tree (gsi, res);
732 7550 : return true;
733 : }
734 :
735 : return false;
736 : }
737 :
738 : /* If the operand to an ABS_EXPR is >= 0, then eliminate the
739 : ABS_EXPR. If the operand is <= 0, then simplify the
740 : ABS_EXPR into a NEGATE_EXPR. */
741 :
742 : bool
743 7366 : simplify_using_ranges::simplify_abs_using_ranges (gimple_stmt_iterator *gsi,
744 : gimple *stmt)
745 : {
746 7366 : tree op = gimple_assign_rhs1 (stmt);
747 7366 : tree zero = build_zero_cst (TREE_TYPE (op));
748 7366 : tree val = fold_cond_with_ops (LE_EXPR, op, zero, stmt);
749 :
750 7366 : if (!val)
751 : {
752 : /* The range is neither <= 0 nor > 0. Now see if it is
753 : either < 0 or >= 0. */
754 7111 : val = fold_cond_with_ops (LT_EXPR, op, zero, stmt);
755 : }
756 7111 : if (val)
757 : {
758 434 : gimple_assign_set_rhs1 (stmt, op);
759 434 : if (integer_zerop (val))
760 261 : gimple_assign_set_rhs_code (stmt, SSA_NAME);
761 : else
762 173 : gimple_assign_set_rhs_code (stmt, NEGATE_EXPR);
763 434 : update_stmt (stmt);
764 434 : fold_stmt (gsi, follow_single_use_edges);
765 434 : return true;
766 : }
767 : return false;
768 : }
769 :
770 : /* irange wrapper for wi_set_zero_nonzero_bits.
771 :
772 : Return TRUE if VR was a constant range and we were able to compute
773 : the bit masks. */
774 :
775 : static bool
776 1614628 : vr_set_zero_nonzero_bits (const tree expr_type,
777 : const irange *vr,
778 : wide_int *may_be_nonzero,
779 : wide_int *must_be_nonzero)
780 : {
781 1614628 : if (vr->varying_p () || vr->undefined_p ())
782 : {
783 943763 : *may_be_nonzero = wi::minus_one (TYPE_PRECISION (expr_type));
784 943763 : *must_be_nonzero = wi::zero (TYPE_PRECISION (expr_type));
785 943763 : return false;
786 : }
787 670867 : wi_set_zero_nonzero_bits (expr_type, vr->lower_bound (), vr->upper_bound (),
788 : *may_be_nonzero, *must_be_nonzero);
789 670865 : return true;
790 : }
791 :
792 : /* Optimize away redundant BIT_AND_EXPR and BIT_IOR_EXPR.
793 : If all the bits that are being cleared by & are already
794 : known to be zero from VR, or all the bits that are being
795 : set by | are already known to be one from VR, the bit
796 : operation is redundant. */
797 :
798 : bool
799 1258361 : simplify_using_ranges::simplify_bit_ops_using_ranges
800 : (gimple_stmt_iterator *gsi,
801 : gimple *stmt)
802 : {
803 1258361 : tree op0 = gimple_assign_rhs1 (stmt);
804 1258361 : tree op1 = gimple_assign_rhs2 (stmt);
805 1258361 : tree op = NULL_TREE;
806 1258361 : int_range_max vr0, vr1;
807 1258361 : wide_int may_be_nonzero0, may_be_nonzero1;
808 1258361 : wide_int must_be_nonzero0, must_be_nonzero1;
809 1258361 : wide_int mask;
810 :
811 1258361 : if (!query->range_of_expr (vr0, op0, stmt)
812 1258361 : || vr0.undefined_p ())
813 : return false;
814 1257669 : if (!query->range_of_expr (vr1, op1, stmt)
815 1257669 : || vr1.undefined_p ())
816 : return false;
817 :
818 1257322 : if (!vr_set_zero_nonzero_bits (TREE_TYPE (op0), &vr0, &may_be_nonzero0,
819 : &must_be_nonzero0))
820 : return false;
821 357306 : if (!vr_set_zero_nonzero_bits (TREE_TYPE (op1), &vr1, &may_be_nonzero1,
822 : &must_be_nonzero1))
823 : return false;
824 :
825 313559 : switch (gimple_assign_rhs_code (stmt))
826 : {
827 224094 : case BIT_AND_EXPR:
828 224094 : mask = wi::bit_and_not (may_be_nonzero0, must_be_nonzero1);
829 224094 : if (mask == 0)
830 : {
831 : op = op0;
832 : break;
833 : }
834 219668 : mask = wi::bit_and_not (may_be_nonzero1, must_be_nonzero0);
835 219668 : if (mask == 0)
836 : {
837 : op = op1;
838 : break;
839 : }
840 : break;
841 89465 : case BIT_IOR_EXPR:
842 89465 : mask = wi::bit_and_not (may_be_nonzero0, must_be_nonzero1);
843 89465 : if (mask == 0)
844 : {
845 : op = op1;
846 : break;
847 : }
848 89465 : mask = wi::bit_and_not (may_be_nonzero1, must_be_nonzero0);
849 89465 : if (mask == 0)
850 : {
851 : op = op0;
852 : break;
853 : }
854 : break;
855 0 : default:
856 0 : gcc_unreachable ();
857 : }
858 :
859 4626 : if (op == NULL_TREE)
860 308933 : return false;
861 :
862 4626 : gimple_assign_set_rhs_with_ops (gsi, TREE_CODE (op), op);
863 4626 : update_stmt (gsi_stmt (*gsi));
864 4626 : return true;
865 1258373 : }
866 :
867 : /* We are comparing trees OP0 and OP1 using COND_CODE. OP0 has
868 : a known value range VR.
869 :
870 : If there is one and only one value which will satisfy the
871 : conditional, then return that value. Else return NULL.
872 :
873 : If signed overflow must be undefined for the value to satisfy
874 : the conditional, then set *STRICT_OVERFLOW_P to true. */
875 :
876 : static tree
877 1580328 : test_for_singularity (enum tree_code cond_code, tree op0,
878 : tree op1, const irange *vr)
879 : {
880 1580328 : tree min = NULL;
881 1580328 : tree max = NULL;
882 :
883 : /* Extract minimum/maximum values which satisfy the conditional as it was
884 : written. */
885 1580328 : if (cond_code == LE_EXPR || cond_code == LT_EXPR)
886 : {
887 690504 : min = TYPE_MIN_VALUE (TREE_TYPE (op0));
888 :
889 690504 : max = op1;
890 690504 : if (cond_code == LT_EXPR)
891 : {
892 90707 : tree one = build_int_cst (TREE_TYPE (op0), 1);
893 90707 : max = fold_build2 (MINUS_EXPR, TREE_TYPE (op0), max, one);
894 : /* Signal to compare_values_warnv this expr doesn't overflow. */
895 90707 : if (EXPR_P (max))
896 0 : suppress_warning (max, OPT_Woverflow);
897 : }
898 : }
899 889824 : else if (cond_code == GE_EXPR || cond_code == GT_EXPR)
900 : {
901 769125 : max = TYPE_MAX_VALUE (TREE_TYPE (op0));
902 :
903 769125 : min = op1;
904 769125 : if (cond_code == GT_EXPR)
905 : {
906 680068 : tree one = build_int_cst (TREE_TYPE (op0), 1);
907 680068 : min = fold_build2 (PLUS_EXPR, TREE_TYPE (op0), min, one);
908 : /* Signal to compare_values_warnv this expr doesn't overflow. */
909 680068 : if (EXPR_P (min))
910 0 : suppress_warning (min, OPT_Woverflow);
911 : }
912 : }
913 :
914 : /* Now refine the minimum and maximum values using any
915 : value range information we have for op0. */
916 1580328 : if (min && max)
917 : {
918 1459629 : tree type = TREE_TYPE (op0);
919 1459629 : tree tmin = wide_int_to_tree (type, vr->lower_bound ());
920 1459629 : tree tmax = wide_int_to_tree (type, vr->upper_bound ());
921 1459629 : if (compare_values (tmin, min) == 1)
922 443412 : min = tmin;
923 1459629 : if (compare_values (tmax, max) == -1)
924 559839 : max = tmax;
925 :
926 : /* If the new min/max values have converged to a single value,
927 : then there is only one value which can satisfy the condition,
928 : return that value. */
929 1459629 : if (operand_equal_p (min, max, 0) && is_gimple_min_invariant (min))
930 : return min;
931 : }
932 : return NULL;
933 : }
934 :
935 : /* Return whether the value range *VR fits in an integer type specified
936 : by PRECISION and UNSIGNED_P. */
937 :
938 : bool
939 248913 : range_fits_type_p (const irange *vr,
940 : unsigned dest_precision, signop dest_sgn)
941 : {
942 248913 : tree src_type;
943 248913 : unsigned src_precision;
944 248913 : widest_int tem;
945 248913 : signop src_sgn;
946 :
947 : /* Now we can only handle ranges with constant bounds. */
948 248913 : if (vr->undefined_p () || vr->varying_p ())
949 : return false;
950 :
951 : /* We can only handle integral and pointer types. */
952 190832 : src_type = vr->type ();
953 190832 : if (!INTEGRAL_TYPE_P (src_type)
954 0 : && !POINTER_TYPE_P (src_type))
955 : return false;
956 :
957 : /* An extension is fine unless VR is SIGNED and dest_sgn is UNSIGNED,
958 : and so is an identity transform. */
959 190832 : src_precision = TYPE_PRECISION (src_type);
960 190832 : src_sgn = TYPE_SIGN (src_type);
961 190832 : if ((src_precision < dest_precision
962 7611 : && !(dest_sgn == UNSIGNED && src_sgn == SIGNED))
963 184383 : || (src_precision == dest_precision && src_sgn == dest_sgn))
964 : return true;
965 :
966 184259 : wide_int vrmin = vr->lower_bound ();
967 184259 : wide_int vrmax = vr->upper_bound ();
968 :
969 : /* For sign changes, the MSB of the wide_int has to be clear.
970 : An unsigned value with its MSB set cannot be represented by
971 : a signed wide_int, while a negative value cannot be represented
972 : by an unsigned wide_int. */
973 184259 : if (src_sgn != dest_sgn
974 184259 : && (wi::lts_p (vrmin, 0) || wi::lts_p (vrmax, 0)))
975 65642 : return false;
976 :
977 : /* Then we can perform the conversion on both ends and compare
978 : the result for equality. */
979 118617 : signop sign = TYPE_SIGN (vr->type ());
980 118617 : tem = wi::ext (widest_int::from (vrmin, sign), dest_precision, dest_sgn);
981 118617 : if (tem != widest_int::from (vrmin, sign))
982 : return false;
983 114368 : tem = wi::ext (widest_int::from (vrmax, sign), dest_precision, dest_sgn);
984 114368 : if (tem != widest_int::from (vrmax, sign))
985 : return false;
986 :
987 : return true;
988 184259 : }
989 :
990 : // Clear edge E of EDGE_EXECUTABLE (it is unexecutable). If it wasn't
991 : // previously clear, propagate to successor blocks if appropriate.
992 :
993 : void
994 319712 : simplify_using_ranges::set_and_propagate_unexecutable (edge e)
995 : {
996 : // If not_executable is already set, we're done.
997 : // This works in the absence of a flag as well.
998 319712 : if ((e->flags & m_not_executable_flag) == m_not_executable_flag)
999 221701 : return;
1000 :
1001 217585 : e->flags |= m_not_executable_flag;
1002 217585 : m_flag_set_edges.safe_push (e);
1003 :
1004 : // Check if the destination block needs to propagate the property.
1005 217585 : basic_block bb = e->dest;
1006 :
1007 : // If any incoming edge is executable, we are done.
1008 217585 : edge_iterator ei;
1009 357943 : FOR_EACH_EDGE (e, ei, bb->preds)
1010 259932 : if ((e->flags & m_not_executable_flag) == 0)
1011 : return;
1012 :
1013 : // This block is also unexecutable, propagate to all exit edges as well.
1014 172220 : FOR_EACH_EDGE (e, ei, bb->succs)
1015 74209 : set_and_propagate_unexecutable (e);
1016 : }
1017 :
1018 : /* If COND can be folded entirely as TRUE or FALSE, rewrite the
1019 : conditional as such, and return TRUE. */
1020 :
1021 : bool
1022 21244594 : simplify_using_ranges::fold_cond (gcond *cond)
1023 : {
1024 21244594 : int_range_max r;
1025 21244594 : if (query->range_of_stmt (r, cond) && r.singleton_p ())
1026 : {
1027 : // COND has already been folded if arguments are constant.
1028 320291 : if (TREE_CODE (gimple_cond_lhs (cond)) != SSA_NAME
1029 320291 : && TREE_CODE (gimple_cond_rhs (cond)) != SSA_NAME)
1030 : return false;
1031 238480 : if (dump_file)
1032 : {
1033 189 : fprintf (dump_file, "Folding predicate ");
1034 189 : print_gimple_expr (dump_file, cond, 0);
1035 189 : fprintf (dump_file, " to ");
1036 : }
1037 238480 : edge e0 = EDGE_SUCC (gimple_bb (cond), 0);
1038 238480 : edge e1 = EDGE_SUCC (gimple_bb (cond), 1);
1039 238480 : if (r.zero_p ())
1040 : {
1041 146280 : if (dump_file)
1042 132 : fprintf (dump_file, "0\n");
1043 146280 : gimple_cond_make_false (cond);
1044 146280 : if (e0->flags & EDGE_TRUE_VALUE)
1045 144363 : set_and_propagate_unexecutable (e0);
1046 : else
1047 1917 : set_and_propagate_unexecutable (e1);
1048 : }
1049 : else
1050 : {
1051 92200 : if (dump_file)
1052 57 : fprintf (dump_file, "1\n");
1053 92200 : gimple_cond_make_true (cond);
1054 92200 : if (e0->flags & EDGE_FALSE_VALUE)
1055 768 : set_and_propagate_unexecutable (e0);
1056 : else
1057 91432 : set_and_propagate_unexecutable (e1);
1058 : }
1059 238480 : update_stmt (cond);
1060 238480 : return true;
1061 : }
1062 :
1063 : // FIXME: Audit the code below and make sure it never finds anything.
1064 20924303 : edge taken_edge;
1065 20924303 : legacy_fold_cond (cond, &taken_edge);
1066 :
1067 20924303 : if (taken_edge)
1068 : {
1069 8 : if (taken_edge->flags & EDGE_TRUE_VALUE)
1070 : {
1071 0 : if (dump_file && (dump_flags & TDF_DETAILS))
1072 0 : fprintf (dump_file, "\nVRP Predicate evaluates to: 1\n");
1073 0 : gimple_cond_make_true (cond);
1074 : }
1075 8 : else if (taken_edge->flags & EDGE_FALSE_VALUE)
1076 : {
1077 8 : if (dump_file && (dump_flags & TDF_DETAILS))
1078 0 : fprintf (dump_file, "\nVRP Predicate evaluates to: 0\n");
1079 8 : gimple_cond_make_false (cond);
1080 : }
1081 : else
1082 0 : gcc_unreachable ();
1083 8 : update_stmt (cond);
1084 8 : return true;
1085 : }
1086 : return false;
1087 21244594 : }
1088 :
1089 : /* Simplify a conditional using a relational operator to an equality
1090 : test if the range information indicates only one value can satisfy
1091 : the original conditional. */
1092 :
1093 : bool
1094 12210676 : simplify_using_ranges::simplify_cond_using_ranges_1 (gcond *stmt)
1095 : {
1096 12210676 : tree op0 = gimple_cond_lhs (stmt);
1097 12210676 : tree op1 = gimple_cond_rhs (stmt);
1098 12210676 : enum tree_code cond_code = gimple_cond_code (stmt);
1099 :
1100 12210676 : if (fold_cond (stmt))
1101 : return true;
1102 :
1103 12073943 : if (simplify_compare_using_ranges_1 (cond_code, op0, op1, stmt))
1104 : {
1105 352684 : if (dump_file)
1106 : {
1107 26 : fprintf (dump_file, "Simplified relational ");
1108 26 : print_gimple_stmt (dump_file, stmt, 0);
1109 26 : fprintf (dump_file, " into ");
1110 : }
1111 :
1112 352684 : gimple_cond_set_code (stmt, cond_code);
1113 352684 : gimple_cond_set_lhs (stmt, op0);
1114 352684 : gimple_cond_set_rhs (stmt, op1);
1115 :
1116 352684 : update_stmt (stmt);
1117 :
1118 352684 : if (dump_file)
1119 : {
1120 26 : print_gimple_stmt (dump_file, stmt, 0);
1121 26 : fprintf (dump_file, "\n");
1122 : }
1123 352684 : return true;
1124 : }
1125 : return false;
1126 : }
1127 :
1128 : /* Like simplify_cond_using_ranges_1 but for assignments rather
1129 : than GIMPLE_COND. */
1130 :
1131 : bool
1132 1200661 : simplify_using_ranges::simplify_compare_assign_using_ranges_1
1133 : (gimple_stmt_iterator *gsi,
1134 : gimple *stmt)
1135 : {
1136 1200661 : enum tree_code code = gimple_assign_rhs_code (stmt);
1137 1200661 : tree op0 = gimple_assign_rhs1 (stmt);
1138 1200661 : tree op1 = gimple_assign_rhs2 (stmt);
1139 1200661 : gcc_assert (TREE_CODE_CLASS (code) == tcc_comparison);
1140 1200661 : bool happened = false;
1141 :
1142 1200661 : if (simplify_compare_using_ranges_1 (code, op0, op1, stmt))
1143 : {
1144 7109 : if (dump_file)
1145 : {
1146 3 : fprintf (dump_file, "Simplified relational ");
1147 3 : print_gimple_stmt (dump_file, stmt, 0);
1148 3 : fprintf (dump_file, " into ");
1149 : }
1150 :
1151 7109 : gimple_assign_set_rhs_code (stmt, code);
1152 7109 : gimple_assign_set_rhs1 (stmt, op0);
1153 7109 : gimple_assign_set_rhs2 (stmt, op1);
1154 :
1155 7109 : update_stmt (stmt);
1156 :
1157 7109 : if (dump_file)
1158 : {
1159 3 : print_gimple_stmt (dump_file, stmt, 0);
1160 3 : fprintf (dump_file, "\n");
1161 : }
1162 : happened = true;
1163 : }
1164 :
1165 : /* Transform EQ_EXPR, NE_EXPR into BIT_XOR_EXPR or identity
1166 : if the RHS is zero or one, and the LHS are known to be boolean
1167 : values. */
1168 1200661 : if ((code == EQ_EXPR || code == NE_EXPR)
1169 646935 : && INTEGRAL_TYPE_P (TREE_TYPE (op0))
1170 1648022 : && simplify_truth_ops_using_ranges (gsi, stmt))
1171 : happened = true;
1172 :
1173 1200661 : return happened;
1174 : }
1175 :
1176 : /* Try to simplify OP0 COND_CODE OP1 using a relational operator to an
1177 : equality test if the range information indicates only one value can
1178 : satisfy the original conditional. */
1179 :
1180 : bool
1181 13274604 : simplify_using_ranges::simplify_compare_using_ranges_1 (tree_code &cond_code, tree &op0, tree &op1, gimple *stmt)
1182 : {
1183 13274604 : bool happened = false;
1184 13274604 : if (cond_code != NE_EXPR
1185 13274604 : && cond_code != EQ_EXPR
1186 3466781 : && TREE_CODE (op0) == SSA_NAME
1187 3466328 : && INTEGRAL_TYPE_P (TREE_TYPE (op0))
1188 16403343 : && is_gimple_min_invariant (op1))
1189 : {
1190 1875107 : int_range_max vr;
1191 :
1192 1875107 : if (!query->range_of_expr (vr, op0, stmt))
1193 0 : vr.set_undefined ();
1194 :
1195 : /* If we have range information for OP0, then we might be
1196 : able to simplify this conditional. */
1197 1875107 : if (!vr.undefined_p () && !vr.varying_p ())
1198 : {
1199 790164 : tree new_tree = test_for_singularity (cond_code, op0, op1, &vr);
1200 790164 : if (new_tree)
1201 : {
1202 120699 : cond_code = EQ_EXPR;
1203 120699 : op1 = new_tree;
1204 120699 : happened = true;
1205 : }
1206 :
1207 : /* Try again after inverting the condition. We only deal
1208 : with integral types here, so no need to worry about
1209 : issues with inverting FP comparisons. */
1210 790164 : new_tree = test_for_singularity
1211 790164 : (invert_tree_comparison (cond_code, false),
1212 : op0, op1, &vr);
1213 790164 : if (new_tree)
1214 : {
1215 170385 : cond_code = NE_EXPR;
1216 170385 : op1 = new_tree;
1217 170385 : happened = true;
1218 : }
1219 : }
1220 1875107 : }
1221 : // Try to simplify casted conditions.
1222 13274604 : if (simplify_casted_compare (cond_code, op0, op1))
1223 76866 : happened = true;
1224 13274604 : return happened;
1225 : }
1226 :
1227 : /* Simplify OP0 code OP1 when OP1 is a constant and OP0 was a SSA_NAME
1228 : defined by a type conversion. Replacing OP0 with RHS of the type conversion.
1229 : Doing so makes the conversion dead which helps subsequent passes. */
1230 :
1231 : bool
1232 13274604 : simplify_using_ranges::simplify_casted_compare (tree_code &, tree &op0, tree &op1)
1233 : {
1234 :
1235 : /* If we have a comparison of an SSA_NAME (OP0) against a constant,
1236 : see if OP0 was set by a type conversion where the source of
1237 : the conversion is another SSA_NAME with a range that fits
1238 : into the range of OP0's type.
1239 :
1240 : If so, the conversion is redundant as the earlier SSA_NAME can be
1241 : used for the comparison directly if we just massage the constant in the
1242 : comparison. */
1243 13274604 : if (TREE_CODE (op0) == SSA_NAME
1244 13191253 : && TREE_CODE (op1) == INTEGER_CST)
1245 : {
1246 9250889 : gimple *def_stmt = SSA_NAME_DEF_STMT (op0);
1247 9250889 : tree innerop;
1248 :
1249 9250889 : if (!is_gimple_assign (def_stmt))
1250 : return false;
1251 :
1252 5692576 : switch (gimple_assign_rhs_code (def_stmt))
1253 : {
1254 466738 : CASE_CONVERT:
1255 466738 : innerop = gimple_assign_rhs1 (def_stmt);
1256 466738 : break;
1257 49287 : case VIEW_CONVERT_EXPR:
1258 49287 : innerop = TREE_OPERAND (gimple_assign_rhs1 (def_stmt), 0);
1259 49287 : if (!INTEGRAL_TYPE_P (TREE_TYPE (innerop)))
1260 : return false;
1261 : break;
1262 : default:
1263 : return false;
1264 : }
1265 :
1266 513661 : if (TREE_CODE (innerop) == SSA_NAME
1267 513633 : && !POINTER_TYPE_P (TREE_TYPE (innerop))
1268 508052 : && !SSA_NAME_OCCURS_IN_ABNORMAL_PHI (innerop)
1269 1021700 : && desired_pro_or_demotion_p (TREE_TYPE (innerop), TREE_TYPE (op0)))
1270 : {
1271 478174 : int_range_max vr;
1272 :
1273 478174 : if (query->range_of_expr (vr, innerop)
1274 478171 : && !vr.varying_p ()
1275 157017 : && !vr.undefined_p ()
1276 156897 : && range_fits_type_p (&vr,
1277 156897 : TYPE_PRECISION (TREE_TYPE (op0)),
1278 156897 : TYPE_SIGN (TREE_TYPE (op0)))
1279 555040 : && int_fits_type_p (op1, TREE_TYPE (innerop)))
1280 : {
1281 76866 : tree newconst = fold_convert (TREE_TYPE (innerop), op1);
1282 76866 : op0 = innerop;
1283 76866 : op1 = newconst;
1284 76866 : return true;
1285 : }
1286 478174 : }
1287 : }
1288 : return false;
1289 : }
1290 :
1291 : /* Simplify a switch statement using the value range of the switch
1292 : argument. */
1293 :
1294 : bool
1295 63015 : simplify_using_ranges::simplify_switch_using_ranges (gswitch *stmt)
1296 : {
1297 63015 : tree op = gimple_switch_index (stmt);
1298 63015 : tree type = TREE_TYPE (op);
1299 63015 : int_range_max op_range (type);
1300 63015 : int_range_max default_range (type);
1301 63015 : auto_vec<unsigned> cases;
1302 63015 : cases.truncate (0);
1303 63015 : edge e;
1304 63015 : switch_update su;
1305 :
1306 : // Abort if we don't have a useful range for the switch index.
1307 63015 : if (!query->range_of_expr (op_range, op, stmt)
1308 63015 : || op_range.varying_p () || op_range.undefined_p ())
1309 : return false;
1310 :
1311 : // Default range starts with full known range of op.
1312 16045 : default_range = op_range;
1313 16045 : edge default_edge = gimple_switch_default_edge (cfun, stmt);
1314 :
1315 16045 : unsigned x, lim = gimple_switch_num_labels (stmt);
1316 96600 : for (x = 1; x < lim; x++)
1317 : {
1318 81399 : e = gimple_switch_edge (cfun, stmt, x);
1319 81399 : tree label = gimple_switch_label (stmt, x);
1320 :
1321 : // If this edge is the same as the default edge, do nothing else.
1322 81399 : if (e == default_edge)
1323 6133 : continue;
1324 : // Ada sometimes has mismatched labels and index. Just bail.
1325 81393 : if (TREE_TYPE (CASE_LOW (label)) != type)
1326 844 : return false;
1327 :
1328 80549 : wide_int low = wi::to_wide (CASE_LOW (label));
1329 80549 : wide_int high;
1330 : // Singleton cases have no CASE_HIGH.
1331 80549 : tree tree_high = CASE_HIGH (label);
1332 80549 : if (tree_high)
1333 3329 : high = wi::to_wide (tree_high);
1334 : else
1335 77220 : high = low;
1336 :
1337 : // If the case range is fully contained in op_range, leave the
1338 : // case as it is, otherwise adjust the labels.
1339 80549 : int_range_max case_range (type, low, high);
1340 80549 : if (case_range.intersect (op_range))
1341 : {
1342 : // If none of the label is in op_range, skip this label.
1343 50466 : if (case_range.undefined_p ())
1344 6127 : continue;
1345 :
1346 : // Part of the label is in op_range, but not all of it. CASE_RANGE
1347 : // contains the part that is. Adjust the case range to
1348 : // the new min/max.
1349 44339 : if (case_range.lower_bound () != low)
1350 10 : CASE_LOW (label) = wide_int_to_tree (type,
1351 20 : case_range.lower_bound ());
1352 44339 : if (case_range.singleton_p ())
1353 42883 : CASE_HIGH (label) = NULL_TREE;
1354 : else
1355 1456 : if (case_range.upper_bound () != high)
1356 7 : CASE_HIGH (label) = wide_int_to_tree (type,
1357 14 : case_range.upper_bound ());
1358 : }
1359 : // Add case label to the keep list.
1360 74422 : cases.safe_push (x);
1361 : // Remove case_range from needing to be handled by the default.
1362 74422 : case_range.invert ();
1363 74422 : default_range.intersect (case_range);
1364 80549 : }
1365 :
1366 : // An undefined DEFAULT range means the current default case is not needed.
1367 15201 : unsigned idx = default_range.undefined_p () ? 0 : 1;
1368 15201 : unsigned vec_size = cases.length () + idx;
1369 15201 : if (vec_size == lim)
1370 : return false;
1371 :
1372 4109 : tree vec2 = make_tree_vec (vec_size);
1373 : // Add default label if there is one.
1374 4109 : if (idx)
1375 : {
1376 3080 : TREE_VEC_ELT (vec2, 0) = gimple_switch_default_label (stmt);
1377 3080 : e = gimple_switch_edge (cfun, stmt, 0);
1378 3080 : e->aux = (void *)-1;
1379 : }
1380 :
1381 16610 : for (x = 0; x < cases.length (); x++)
1382 : {
1383 12501 : unsigned swi = cases[x];
1384 12501 : TREE_VEC_ELT (vec2, idx++) = gimple_switch_label (stmt, swi);
1385 12501 : e = gimple_switch_edge (cfun, stmt, swi);
1386 12501 : e->aux = (void *)-1;
1387 : }
1388 :
1389 : /* Queue not needed edges for later removal. */
1390 4109 : edge_iterator ei;
1391 25909 : FOR_EACH_EDGE (e, ei, gimple_bb (stmt)->succs)
1392 : {
1393 21800 : if (e->aux == (void *)-1)
1394 : {
1395 14777 : e->aux = NULL;
1396 14777 : continue;
1397 : }
1398 :
1399 7023 : if (dump_file && (dump_flags & TDF_DETAILS))
1400 : {
1401 0 : fprintf (dump_file, "removing unreachable case label\n");
1402 : }
1403 7023 : to_remove_edges.safe_push (e);
1404 7023 : set_and_propagate_unexecutable (e);
1405 7023 : e->flags &= ~EDGE_EXECUTABLE;
1406 7023 : e->flags |= EDGE_IGNORE;
1407 : }
1408 :
1409 : /* And queue an update for the stmt. */
1410 4109 : su.stmt = stmt;
1411 4109 : su.vec = vec2;
1412 4109 : to_update_switch_stmts.safe_push (su);
1413 4109 : return true;
1414 63015 : }
1415 :
1416 : void
1417 13267644 : simplify_using_ranges::cleanup_edges_and_switches (void)
1418 : {
1419 13267644 : int i;
1420 13267644 : edge e;
1421 13267644 : switch_update *su;
1422 :
1423 : /* Clear any edges marked as not executable. */
1424 13267644 : if (m_not_executable_flag)
1425 : {
1426 4451305 : FOR_EACH_VEC_ELT (m_flag_set_edges, i, e)
1427 217585 : e->flags &= ~m_not_executable_flag;
1428 : }
1429 : /* Remove dead edges from SWITCH_EXPR optimization. This leaves the
1430 : CFG in a broken state and requires a cfg_cleanup run. */
1431 13278495 : FOR_EACH_VEC_ELT (to_remove_edges, i, e)
1432 7023 : remove_edge (e);
1433 :
1434 : /* Update SWITCH_EXPR case label vector. */
1435 13271753 : FOR_EACH_VEC_ELT (to_update_switch_stmts, i, su)
1436 : {
1437 4109 : size_t j;
1438 4109 : size_t n = TREE_VEC_LENGTH (su->vec);
1439 4109 : tree label;
1440 4109 : gimple_switch_set_num_labels (su->stmt, n);
1441 23799 : for (j = 0; j < n; j++)
1442 15581 : gimple_switch_set_label (su->stmt, j, TREE_VEC_ELT (su->vec, j));
1443 : /* As we may have replaced the default label with a regular one
1444 : make sure to make it a real default label again. This ensures
1445 : optimal expansion. */
1446 4109 : label = gimple_switch_label (su->stmt, 0);
1447 4109 : CASE_LOW (label) = NULL_TREE;
1448 4109 : CASE_HIGH (label) = NULL_TREE;
1449 : }
1450 :
1451 13267644 : if (!to_remove_edges.is_empty ())
1452 : {
1453 3828 : free_dominance_info (CDI_DOMINATORS);
1454 3828 : loops_state_set (LOOPS_NEED_FIXUP);
1455 : }
1456 :
1457 13267644 : to_remove_edges.release ();
1458 13267644 : to_update_switch_stmts.release ();
1459 13267644 : }
1460 :
1461 : /* Simplify an integral conversion from an SSA name in STMT. */
1462 :
1463 : static bool
1464 4746756 : simplify_conversion_using_ranges (gimple_stmt_iterator *gsi, gimple *stmt)
1465 : {
1466 4746756 : tree innerop, middleop, finaltype;
1467 4746756 : gimple *def_stmt;
1468 4746756 : signop inner_sgn, middle_sgn, final_sgn;
1469 4746756 : unsigned inner_prec, middle_prec, final_prec;
1470 4746756 : widest_int innermin, innermed, innermax, middlemin, middlemed, middlemax;
1471 :
1472 4746756 : finaltype = TREE_TYPE (gimple_assign_lhs (stmt));
1473 4746756 : if (!INTEGRAL_TYPE_P (finaltype))
1474 : return false;
1475 4364545 : middleop = gimple_assign_rhs1 (stmt);
1476 4364545 : def_stmt = SSA_NAME_DEF_STMT (middleop);
1477 4364545 : if (!is_gimple_assign (def_stmt)
1478 4364545 : || !CONVERT_EXPR_CODE_P (gimple_assign_rhs_code (def_stmt)))
1479 : return false;
1480 150103 : innerop = gimple_assign_rhs1 (def_stmt);
1481 150103 : if (TREE_CODE (innerop) != SSA_NAME
1482 150103 : || SSA_NAME_OCCURS_IN_ABNORMAL_PHI (innerop))
1483 : return false;
1484 :
1485 : /* Get the value-range of the inner operand. Use global ranges in
1486 : case innerop was created during substitute-and-fold. */
1487 146851 : wide_int imin, imax;
1488 146851 : int_range_max vr;
1489 146851 : if (!INTEGRAL_TYPE_P (TREE_TYPE (innerop)))
1490 : return false;
1491 246126 : get_range_query (cfun)->range_of_expr (vr, innerop, stmt);
1492 123063 : if (vr.undefined_p () || vr.varying_p ())
1493 : return false;
1494 69351 : innermin = widest_int::from (vr.lower_bound (), TYPE_SIGN (TREE_TYPE (innerop)));
1495 69351 : innermax = widest_int::from (vr.upper_bound (), TYPE_SIGN (TREE_TYPE (innerop)));
1496 :
1497 : /* Simulate the conversion chain to check if the result is equal if
1498 : the middle conversion is removed. */
1499 69351 : inner_prec = TYPE_PRECISION (TREE_TYPE (innerop));
1500 69351 : middle_prec = TYPE_PRECISION (TREE_TYPE (middleop));
1501 69351 : final_prec = TYPE_PRECISION (finaltype);
1502 :
1503 : /* If the first conversion is not injective, the second must not
1504 : be widening. */
1505 69351 : if (wi::gtu_p (innermax - innermin,
1506 138702 : wi::mask <widest_int> (middle_prec, false))
1507 69351 : && middle_prec < final_prec)
1508 : return false;
1509 : /* We also want a medium value so that we can track the effect that
1510 : narrowing conversions with sign change have. */
1511 58032 : inner_sgn = TYPE_SIGN (TREE_TYPE (innerop));
1512 58032 : if (inner_sgn == UNSIGNED)
1513 44135 : innermed = wi::shifted_mask <widest_int> (1, inner_prec - 1, false);
1514 : else
1515 13897 : innermed = 0;
1516 58032 : if (wi::cmp (innermin, innermed, inner_sgn) >= 0
1517 58032 : || wi::cmp (innermed, innermax, inner_sgn) >= 0)
1518 42461 : innermed = innermin;
1519 :
1520 58032 : middle_sgn = TYPE_SIGN (TREE_TYPE (middleop));
1521 58032 : middlemin = wi::ext (innermin, middle_prec, middle_sgn);
1522 58032 : middlemed = wi::ext (innermed, middle_prec, middle_sgn);
1523 58032 : middlemax = wi::ext (innermax, middle_prec, middle_sgn);
1524 :
1525 : /* Require that the final conversion applied to both the original
1526 : and the intermediate range produces the same result. */
1527 58032 : final_sgn = TYPE_SIGN (finaltype);
1528 116064 : if (wi::ext (middlemin, final_prec, final_sgn)
1529 116064 : != wi::ext (innermin, final_prec, final_sgn)
1530 111076 : || wi::ext (middlemed, final_prec, final_sgn)
1531 224646 : != wi::ext (innermed, final_prec, final_sgn)
1532 152142 : || wi::ext (middlemax, final_prec, final_sgn)
1533 199197 : != wi::ext (innermax, final_prec, final_sgn))
1534 : return false;
1535 :
1536 45652 : gimple_assign_set_rhs1 (stmt, innerop);
1537 45652 : fold_stmt (gsi, follow_single_use_edges);
1538 45652 : return true;
1539 4893607 : }
1540 :
1541 : /* Simplify a conversion from integral SSA name to float in STMT. */
1542 :
1543 : bool
1544 254831 : simplify_using_ranges::simplify_float_conversion_using_ranges
1545 : (gimple_stmt_iterator *gsi,
1546 : gimple *stmt)
1547 : {
1548 254831 : tree rhs1 = gimple_assign_rhs1 (stmt);
1549 254831 : int_range_max vr;
1550 254831 : scalar_float_mode fltmode
1551 254831 : = SCALAR_FLOAT_TYPE_MODE (TREE_TYPE (gimple_assign_lhs (stmt)));
1552 254831 : scalar_int_mode mode;
1553 254831 : tree tem;
1554 254831 : gassign *conv;
1555 :
1556 : /* We can only handle constant ranges. */
1557 254831 : if (!query->range_of_expr (vr, rhs1, stmt)
1558 254831 : || vr.varying_p ()
1559 356389 : || vr.undefined_p ())
1560 : return false;
1561 :
1562 : /* The code below doesn't work for large/huge _BitInt, nor is really
1563 : needed for those, bitint lowering does use ranges already. */
1564 100888 : if (TREE_CODE (TREE_TYPE (rhs1)) == BITINT_TYPE
1565 100888 : && TYPE_MODE (TREE_TYPE (rhs1)) == BLKmode)
1566 : return false;
1567 : /* First check if we can use a signed type in place of an unsigned. */
1568 100886 : scalar_int_mode rhs_mode = SCALAR_INT_TYPE_MODE (TREE_TYPE (rhs1));
1569 100886 : if (TYPE_UNSIGNED (TREE_TYPE (rhs1))
1570 5294 : && can_float_p (fltmode, rhs_mode, 0) != CODE_FOR_nothing
1571 104419 : && range_fits_type_p (&vr, TYPE_PRECISION (TREE_TYPE (rhs1)), SIGNED))
1572 : mode = rhs_mode;
1573 : /* If we can do the conversion in the current input mode do nothing. */
1574 99351 : else if (can_float_p (fltmode, rhs_mode,
1575 99351 : TYPE_UNSIGNED (TREE_TYPE (rhs1))) != CODE_FOR_nothing)
1576 : return false;
1577 : /* Otherwise search for a mode we can use, starting from the narrowest
1578 : integer mode available. */
1579 : else
1580 : {
1581 4417 : mode = NARROWEST_INT_MODE;
1582 15936 : for (;;)
1583 : {
1584 : /* If we cannot do a signed conversion to float from mode
1585 : or if the value-range does not fit in the signed type
1586 : try with a wider mode. */
1587 15936 : if (can_float_p (fltmode, mode, 0) != CODE_FOR_nothing
1588 15936 : && range_fits_type_p (&vr, GET_MODE_PRECISION (mode), SIGNED))
1589 : break;
1590 :
1591 : /* But do not widen the input. Instead leave that to the
1592 : optabs expansion code. */
1593 31612 : if (!GET_MODE_WIDER_MODE (mode).exists (&mode)
1594 15806 : || GET_MODE_PRECISION (mode) > TYPE_PRECISION (TREE_TYPE (rhs1)))
1595 : return false;
1596 : }
1597 : }
1598 :
1599 : /* It works, insert a truncation or sign-change before the
1600 : float conversion. */
1601 1665 : tem = make_ssa_name (build_nonstandard_integer_type
1602 1665 : (GET_MODE_PRECISION (mode), 0));
1603 1665 : conv = gimple_build_assign (tem, NOP_EXPR, rhs1);
1604 1665 : gsi_insert_before (gsi, conv, GSI_SAME_STMT);
1605 1665 : gimple_assign_set_rhs1 (stmt, tem);
1606 1665 : fold_stmt (gsi, follow_single_use_edges);
1607 :
1608 1665 : return true;
1609 254831 : }
1610 :
1611 : /* Simplify an internal fn call using ranges if possible. */
1612 :
1613 : bool
1614 522681 : simplify_using_ranges::simplify_internal_call_using_ranges
1615 : (gimple_stmt_iterator *gsi,
1616 : gimple *stmt)
1617 : {
1618 522681 : enum tree_code subcode;
1619 522681 : bool is_ubsan = false;
1620 522681 : bool ovf = false;
1621 522681 : switch (gimple_call_internal_fn (stmt))
1622 : {
1623 : case IFN_UBSAN_CHECK_ADD:
1624 : subcode = PLUS_EXPR;
1625 : is_ubsan = true;
1626 : break;
1627 2477 : case IFN_UBSAN_CHECK_SUB:
1628 2477 : subcode = MINUS_EXPR;
1629 2477 : is_ubsan = true;
1630 2477 : break;
1631 2123 : case IFN_UBSAN_CHECK_MUL:
1632 2123 : subcode = MULT_EXPR;
1633 2123 : is_ubsan = true;
1634 2123 : break;
1635 40677 : case IFN_ADD_OVERFLOW:
1636 40677 : subcode = PLUS_EXPR;
1637 40677 : break;
1638 49661 : case IFN_SUB_OVERFLOW:
1639 49661 : subcode = MINUS_EXPR;
1640 49661 : break;
1641 46759 : case IFN_MUL_OVERFLOW:
1642 46759 : subcode = MULT_EXPR;
1643 46759 : break;
1644 : default:
1645 : return false;
1646 : }
1647 :
1648 144276 : tree op0 = gimple_call_arg (stmt, 0);
1649 144276 : tree op1 = gimple_call_arg (stmt, 1);
1650 144276 : tree type;
1651 144276 : if (is_ubsan)
1652 : {
1653 7179 : type = TREE_TYPE (op0);
1654 7179 : if (VECTOR_TYPE_P (type))
1655 : return false;
1656 : }
1657 137097 : else if (gimple_call_lhs (stmt) == NULL_TREE)
1658 : return false;
1659 : else
1660 137097 : type = TREE_TYPE (TREE_TYPE (gimple_call_lhs (stmt)));
1661 143406 : if (!check_for_binary_op_overflow (query, subcode, type, op0, op1, &ovf, stmt)
1662 143406 : || (is_ubsan && ovf))
1663 : return false;
1664 :
1665 3501 : gimple *g;
1666 3501 : location_t loc = gimple_location (stmt);
1667 3501 : if (is_ubsan)
1668 573 : g = gimple_build_assign (gimple_call_lhs (stmt), subcode, op0, op1);
1669 : else
1670 : {
1671 2928 : tree utype = type;
1672 2928 : if (ovf
1673 1439 : || !useless_type_conversion_p (type, TREE_TYPE (op0))
1674 3643 : || !useless_type_conversion_p (type, TREE_TYPE (op1)))
1675 2502 : utype = unsigned_type_for (type);
1676 2928 : if (TREE_CODE (op0) == INTEGER_CST)
1677 1175 : op0 = fold_convert (utype, op0);
1678 1753 : else if (!useless_type_conversion_p (utype, TREE_TYPE (op0)))
1679 : {
1680 734 : g = gimple_build_assign (make_ssa_name (utype), NOP_EXPR, op0);
1681 734 : gimple_set_location (g, loc);
1682 734 : gsi_insert_before (gsi, g, GSI_SAME_STMT);
1683 734 : op0 = gimple_assign_lhs (g);
1684 : }
1685 2928 : if (TREE_CODE (op1) == INTEGER_CST)
1686 1698 : op1 = fold_convert (utype, op1);
1687 1230 : else if (!useless_type_conversion_p (utype, TREE_TYPE (op1)))
1688 : {
1689 21 : g = gimple_build_assign (make_ssa_name (utype), NOP_EXPR, op1);
1690 21 : gimple_set_location (g, loc);
1691 21 : gsi_insert_before (gsi, g, GSI_SAME_STMT);
1692 21 : op1 = gimple_assign_lhs (g);
1693 : }
1694 2928 : g = gimple_build_assign (make_ssa_name (utype), subcode, op0, op1);
1695 2928 : gimple_set_location (g, loc);
1696 2928 : gsi_insert_before (gsi, g, GSI_SAME_STMT);
1697 2928 : if (utype != type)
1698 : {
1699 1344 : g = gimple_build_assign (make_ssa_name (type), NOP_EXPR,
1700 : gimple_assign_lhs (g));
1701 1344 : gimple_set_location (g, loc);
1702 1344 : gsi_insert_before (gsi, g, GSI_SAME_STMT);
1703 : }
1704 2928 : g = gimple_build_assign (gimple_call_lhs (stmt), COMPLEX_EXPR,
1705 : gimple_assign_lhs (g),
1706 2928 : build_int_cst (type, ovf));
1707 : }
1708 3501 : gimple_set_location (g, loc);
1709 3501 : gsi_replace (gsi, g, false);
1710 3501 : return true;
1711 : }
1712 :
1713 : /* Return true if VAR is a two-valued variable. Set a and b with the
1714 : two-values when it is true. Return false otherwise. */
1715 :
1716 : bool
1717 496008 : simplify_using_ranges::two_valued_val_range_p (tree var, tree *a, tree *b,
1718 : gimple *s)
1719 : {
1720 496008 : int_range_max vr;
1721 496008 : if (!query->range_of_expr (vr, var, s))
1722 : return false;
1723 496008 : if (vr.varying_p () || vr.undefined_p ())
1724 : return false;
1725 :
1726 817310 : if ((vr.num_pairs () == 1 && vr.upper_bound () - vr.lower_bound () == 1)
1727 423059 : || (vr.num_pairs () == 2
1728 291362 : && vr.lower_bound (0) == vr.upper_bound (0)
1729 247678 : && vr.lower_bound (1) == vr.upper_bound (1)))
1730 : {
1731 7558 : *a = wide_int_to_tree (TREE_TYPE (var), vr.lower_bound ());
1732 7558 : *b = wide_int_to_tree (TREE_TYPE (var), vr.upper_bound ());
1733 7558 : return true;
1734 : }
1735 : return false;
1736 496008 : }
1737 :
1738 13267644 : simplify_using_ranges::simplify_using_ranges (range_query *query,
1739 13267644 : int not_executable_flag)
1740 13267644 : : query (query)
1741 : {
1742 13267644 : to_remove_edges = vNULL;
1743 13267644 : to_update_switch_stmts = vNULL;
1744 13267644 : m_not_executable_flag = not_executable_flag;
1745 13267644 : m_flag_set_edges = vNULL;
1746 13267644 : }
1747 :
1748 13267644 : simplify_using_ranges::~simplify_using_ranges ()
1749 : {
1750 13267644 : cleanup_edges_and_switches ();
1751 13267644 : m_flag_set_edges.release ();
1752 13267644 : }
1753 :
1754 : /* Simplify STMT using ranges if possible. */
1755 :
1756 : bool
1757 238248738 : simplify_using_ranges::simplify (gimple_stmt_iterator *gsi)
1758 : {
1759 238248738 : gcc_checking_assert (query);
1760 :
1761 238248738 : gimple *stmt = gsi_stmt (*gsi);
1762 238248738 : if (is_gimple_assign (stmt))
1763 : {
1764 66509162 : enum tree_code rhs_code = gimple_assign_rhs_code (stmt);
1765 66509162 : tree rhs1 = gimple_assign_rhs1 (stmt);
1766 66509162 : tree rhs2 = gimple_assign_rhs2 (stmt);
1767 66509162 : tree lhs = gimple_assign_lhs (stmt);
1768 66509162 : tree val1 = NULL_TREE, val2 = NULL_TREE;
1769 66509162 : use_operand_p use_p;
1770 66509162 : gimple *use_stmt;
1771 :
1772 : /* Convert:
1773 : LHS = CST BINOP VAR
1774 : Where VAR is two-valued and LHS is used in GIMPLE_COND only
1775 : To:
1776 : LHS = VAR == VAL1 ? (CST BINOP VAL1) : (CST BINOP VAL2)
1777 :
1778 : Also handles:
1779 : LHS = VAR BINOP CST
1780 : Where VAR is two-valued and LHS is used in GIMPLE_COND only
1781 : To:
1782 : LHS = VAR == VAL1 ? (VAL1 BINOP CST) : (VAL2 BINOP CST) */
1783 :
1784 66509162 : if (TREE_CODE_CLASS (rhs_code) == tcc_binary
1785 14336142 : && INTEGRAL_TYPE_P (TREE_TYPE (rhs1))
1786 10206018 : && ((TREE_CODE (rhs1) == INTEGER_CST
1787 180297 : && TREE_CODE (rhs2) == SSA_NAME)
1788 10026327 : || (TREE_CODE (rhs2) == INTEGER_CST
1789 6701353 : && TREE_CODE (rhs1) == SSA_NAME))
1790 6880438 : && single_imm_use (lhs, &use_p, &use_stmt)
1791 71772978 : && gimple_code (use_stmt) == GIMPLE_COND)
1792 :
1793 : {
1794 496008 : tree new_rhs1 = NULL_TREE;
1795 496008 : tree new_rhs2 = NULL_TREE;
1796 496008 : tree cmp_var = NULL_TREE;
1797 :
1798 496008 : if (TREE_CODE (rhs2) == SSA_NAME
1799 496008 : && two_valued_val_range_p (rhs2, &val1, &val2, stmt))
1800 : {
1801 : /* Optimize RHS1 OP [VAL1, VAL2]. */
1802 239 : new_rhs1 = int_const_binop (rhs_code, rhs1, val1);
1803 239 : new_rhs2 = int_const_binop (rhs_code, rhs1, val2);
1804 239 : cmp_var = rhs2;
1805 : }
1806 495769 : else if (TREE_CODE (rhs1) == SSA_NAME
1807 495769 : && two_valued_val_range_p (rhs1, &val1, &val2, stmt))
1808 : {
1809 : /* Optimize [VAL1, VAL2] OP RHS2. */
1810 7319 : new_rhs1 = int_const_binop (rhs_code, val1, rhs2);
1811 7319 : new_rhs2 = int_const_binop (rhs_code, val2, rhs2);
1812 7319 : cmp_var = rhs1;
1813 : }
1814 :
1815 : /* If we could not find two-vals or the optimzation is invalid as
1816 : in divide by zero, new_rhs1 / new_rhs will be NULL_TREE. */
1817 496008 : if (new_rhs1 && new_rhs2)
1818 : {
1819 7558 : tree cond = gimple_build (gsi, true, GSI_SAME_STMT,
1820 : UNKNOWN_LOCATION,
1821 : EQ_EXPR, boolean_type_node,
1822 : cmp_var, val1);
1823 7558 : gimple_assign_set_rhs_with_ops (gsi,
1824 : COND_EXPR, cond,
1825 : new_rhs1,
1826 : new_rhs2);
1827 7558 : update_stmt (gsi_stmt (*gsi));
1828 7558 : fold_stmt (gsi, follow_single_use_edges);
1829 8079266 : return true;
1830 : }
1831 : }
1832 :
1833 66501604 : if (TREE_CODE_CLASS (rhs_code) == tcc_comparison)
1834 1200661 : return simplify_compare_assign_using_ranges_1 (gsi, stmt);
1835 :
1836 65300943 : switch (rhs_code)
1837 : {
1838 :
1839 : /* Transform TRUNC_DIV_EXPR and TRUNC_MOD_EXPR into RSHIFT_EXPR
1840 : and BIT_AND_EXPR respectively if the first operand is greater
1841 : than zero and the second operand is an exact power of two.
1842 : Also optimize TRUNC_MOD_EXPR away if the second operand is
1843 : constant and the first operand already has the right value
1844 : range. */
1845 317164 : case TRUNC_DIV_EXPR:
1846 317164 : case TRUNC_MOD_EXPR:
1847 317164 : if ((TREE_CODE (rhs1) == SSA_NAME
1848 317164 : || TREE_CODE (rhs1) == INTEGER_CST)
1849 317164 : && INTEGRAL_TYPE_P (TREE_TYPE (rhs1)))
1850 315950 : return simplify_div_or_mod_using_ranges (gsi, stmt);
1851 : break;
1852 :
1853 : /* Transform ABS (X) into X or -X as appropriate. */
1854 54778 : case ABS_EXPR:
1855 54778 : if (TREE_CODE (rhs1) == SSA_NAME
1856 54778 : && INTEGRAL_TYPE_P (TREE_TYPE (rhs1)))
1857 7366 : return simplify_abs_using_ranges (gsi, stmt);
1858 : break;
1859 :
1860 1289874 : case BIT_AND_EXPR:
1861 1289874 : case BIT_IOR_EXPR:
1862 : /* Optimize away BIT_AND_EXPR and BIT_IOR_EXPR if all the bits
1863 : being cleared are already cleared or all the bits being set
1864 : are already set. Beware that boolean types must be handled
1865 : logically (see range-op.cc) unless they have precision 1. */
1866 2498889 : if (INTEGRAL_TYPE_P (TREE_TYPE (rhs1))
1867 2467376 : && (TREE_CODE (TREE_TYPE (rhs1)) != BOOLEAN_TYPE
1868 292118 : || TYPE_PRECISION (TREE_TYPE (rhs1)) == 1))
1869 1258361 : return simplify_bit_ops_using_ranges (gsi, stmt);
1870 : break;
1871 :
1872 5842533 : CASE_CONVERT:
1873 5842533 : if (TREE_CODE (rhs1) == SSA_NAME
1874 5842533 : && INTEGRAL_TYPE_P (TREE_TYPE (rhs1)))
1875 4746756 : return simplify_conversion_using_ranges (gsi, stmt);
1876 : break;
1877 :
1878 257113 : case FLOAT_EXPR:
1879 257113 : if (TREE_CODE (rhs1) == SSA_NAME
1880 257113 : && INTEGRAL_TYPE_P (TREE_TYPE (rhs1)))
1881 254831 : return simplify_float_conversion_using_ranges (gsi, stmt);
1882 : break;
1883 :
1884 203189 : case MIN_EXPR:
1885 203189 : case MAX_EXPR:
1886 203189 : return simplify_min_or_max_using_ranges (gsi, stmt);
1887 :
1888 390595 : case RSHIFT_EXPR:
1889 390595 : {
1890 390595 : tree op0 = gimple_assign_rhs1 (stmt);
1891 390595 : tree type = TREE_TYPE (op0);
1892 390595 : int_range_max range;
1893 390595 : if (TYPE_SIGN (type) == SIGNED
1894 390595 : && query->range_of_expr (range, op0, stmt))
1895 : {
1896 84594 : unsigned prec = TYPE_PRECISION (TREE_TYPE (op0));
1897 169188 : int_range<2> nzm1 (type, wi::minus_one (prec), wi::zero (prec),
1898 84594 : VR_ANTI_RANGE);
1899 84594 : range.intersect (nzm1);
1900 : // If there are no ranges other than [-1, 0] remove the shift.
1901 84594 : if (range.undefined_p ())
1902 : {
1903 61 : gimple_assign_set_rhs_from_tree (gsi, op0);
1904 61 : return true;
1905 : }
1906 : return false;
1907 84594 : }
1908 306001 : break;
1909 390595 : }
1910 : default:
1911 : break;
1912 : }
1913 : }
1914 171739576 : else if (gimple_code (stmt) == GIMPLE_COND)
1915 12210676 : return simplify_cond_using_ranges_1 (as_a <gcond *> (stmt));
1916 159528900 : else if (gimple_code (stmt) == GIMPLE_SWITCH)
1917 63015 : return simplify_switch_using_ranges (as_a <gswitch *> (stmt));
1918 159465885 : else if (is_gimple_call (stmt)
1919 159465885 : && gimple_call_internal_p (stmt))
1920 522681 : return simplify_internal_call_using_ranges (gsi, stmt);
1921 :
1922 : return false;
1923 : }
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