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| author | Bin Cheng <bin.cheng@arm.com> | 2016-04-21 11:28:58 +0000 |
|---|---|---|
| committer | Bin Cheng <amker@gcc.gnu.org> | 2016-04-21 11:28:58 +0000 |
| commit | 2359e571cd71026167931216e730129d53244dd1 (patch) | |
| tree | 93769dac35b40a1151671d0c8e5afcda93f8bd2a /gcc/tree-ssa-loop-niter.c | |
| parent | ce0e66ffb22832d1668dd9d92ad0ca128fbd07c3 (diff) | |
| download | gcc-2359e571cd71026167931216e730129d53244dd1.zip gcc-2359e571cd71026167931216e730129d53244dd1.tar.gz gcc-2359e571cd71026167931216e730129d53244dd1.tar.bz2 | |
re PR tree-optimization/70715 (SCEV failed to prove no-overflow-ness information unsigned loop IV)
PR tree-optimization/70715
* tree-ssa-loop-niter.c (loop_exits_before_overflow): Check equality
after expanding BASE using expand_simple_operations.
gcc/testsuite/ChangeLog
PR tree-optimization/70715
* gcc.dg/tree-ssa/scev-13.c: New test.
From-SVN: r235333
Diffstat (limited to 'gcc/tree-ssa-loop-niter.c')
| -rw-r--r-- | gcc/tree-ssa-loop-niter.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/gcc/tree-ssa-loop-niter.c b/gcc/tree-ssa-loop-niter.c index 81689fc..c61083e 100644 --- a/gcc/tree-ssa-loop-niter.c +++ b/gcc/tree-ssa-loop-niter.c @@ -4141,7 +4141,11 @@ loop_exits_before_overflow (tree base, tree step, continue; /* Done proving if this is a no-overflow control IV. */ - if (operand_equal_p (base, civ->base, 0)) + if (operand_equal_p (base, civ->base, 0) + /* Control IV is recorded after expanding simple operations, + Here we compare it against expanded base too. */ + || operand_equal_p (expand_simple_operations (base), + civ->base, 0)) return true; /* If this is a before stepping control IV, in other words, we have |