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re PR middle-end/23410 (FAIL: gcc.c-torture/execute/950612-1.c execution, at -Os and -O3) 

PR tree-optimization/23410
	* tree-ssa-loop-niter.c (scev_probably_wraps_p): Check that the
	sequence is not wrapping during the first step.

From-SVN: r103733
This commit is contained in:
Sebastian Pop 2005-09-01 17:09:41 +02:00 committed by Sebastian Pop
parent ac156e9176
commit ab02cc4e2c
2 changed files with 19 additions and 2 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2005-09-01 Sebastian Pop <pop@cri.ensmp.fr>
PR tree-optimization/23410
* tree-ssa-loop-niter.c (scev_probably_wraps_p): Check that the
sequence is not wrapping during the first step.
2005-09-01 Jakub Jelinek <jakub@redhat.com>
PR debug/7241

15
gcc/tree-ssa-loop-niter.c
View File

@ -1823,7 +1823,8 @@ scev_probably_wraps_p (tree type, tree base, tree step,
struct nb_iter_bound *bound;
tree delta, step_abs;
tree unsigned_type, valid_niter;
tree base_plus_step;
tree base_plus_step, bpsps;
int cps, cpsps;
/* FIXME: The following code will not be used anymore once
http://gcc.gnu.org/ml/gcc-patches/2005-06/msg02025.html is
@ -1865,7 +1866,17 @@ scev_probably_wraps_p (tree type, tree base, tree step,
*unknown_max = false;
base_plus_step = fold_build2 (PLUS_EXPR, type, base, step);
switch (compare_trees (base_plus_step, base))
bpsps = fold_build2 (PLUS_EXPR, type, base_plus_step, step);
cps = compare_trees (base_plus_step, base);
cpsps = compare_trees (bpsps, base_plus_step);
/* Check that the sequence is not wrapping in the first step: it
should have the same monotonicity for the first two steps. See
PR23410. */
if (cps != cpsps)
return true;
switch (cps)
{
case -1:
{