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| author | Dan Gohman <gohman@apple.com> | 2010-02-17 00:41:53 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2010-02-17 00:41:53 +0000 |
| commit | 5f10d6c52c8fadd914fb45dea6f72d5f5f89a96e (patch) | |
| tree | d1b64a01064d3bad7c2e6488374c8e7f7fd80fc2 /llvm/lib | |
| parent | f441baf6ddf7eb2b4dbe3a645ca063a33f63f9a5 (diff) | |
| download | bcm5719-llvm-5f10d6c52c8fadd914fb45dea6f72d5f5f89a96e.tar.gz bcm5719-llvm-5f10d6c52c8fadd914fb45dea6f72d5f5f89a96e.zip | |
Don't attempt to divide INT_MIN by -1; consider such cases to
have overflowed.
llvm-svn: 96428
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp index dddc65a1d0d..9d11876c21d 100644 --- a/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp +++ b/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp @@ -2112,12 +2112,16 @@ void LSRInstance::GenerateICmpZeroScales(LSRUse &LU, unsigned LUIdx, Formula F = Base; // Check that the multiplication doesn't overflow. + if (F.AM.BaseOffs == INT64_MIN && Factor == -1) + continue; F.AM.BaseOffs = (uint64_t)Base.AM.BaseOffs * Factor; if ((int64_t)F.AM.BaseOffs / Factor != Base.AM.BaseOffs) continue; // Check that multiplying with the use offset doesn't overflow. int64_t Offset = LU.MinOffset; + if (Offset == INT64_MIN && Factor == -1) + continue; Offset = (uint64_t)Offset * Factor; if ((int64_t)Offset / Factor != LU.MinOffset) continue; |
