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| author | Dan Gohman <gohman@apple.com> | 2009-04-27 20:35:32 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2009-04-27 20:35:32 +0000 |
| commit | c7749b747e634f310b7f0e075f7329dcb88f58cc (patch) | |
| tree | c49c4223ff0145c11e8d9e5ca5747bfc5a03bc46 /lib | |
| parent | 487fa01673a1d13331b7173e9e6812e72dd4361e (diff) | |
| download | external_llvm-c7749b747e634f310b7f0e075f7329dcb88f58cc.zip external_llvm-c7749b747e634f310b7f0e075f7329dcb88f58cc.tar.gz external_llvm-c7749b747e634f310b7f0e075f7329dcb88f58cc.tar.bz2 | |
Permit ChangeCompareStride to rewrite a comparison when the factor
between the comparison's iv stride and the candidate stride is
exactly -1.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70244 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Transforms/Scalar/LoopStrengthReduce.cpp | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/lib/Transforms/Scalar/LoopStrengthReduce.cpp index c436cec..a6795a7 100644 --- a/lib/Transforms/Scalar/LoopStrengthReduce.cpp +++ b/lib/Transforms/Scalar/LoopStrengthReduce.cpp @@ -2028,7 +2028,9 @@ ICmpInst *LoopStrengthReduce::ChangeCompareStride(Loop *L, ICmpInst *Cond, if (!isa<SCEVConstant>(SI->first)) continue; int64_t SSInt = cast<SCEVConstant>(SI->first)->getValue()->getSExtValue(); - if (abs(SSInt) <= abs(CmpSSInt) || (SSInt % CmpSSInt) != 0) + if (SSInt == CmpSSInt || + abs(SSInt) < abs(CmpSSInt) || + (SSInt % CmpSSInt) != 0) continue; Scale = SSInt / CmpSSInt; |