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allow -1 strides to reuse "1" strides.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35607 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-04-02 22:51:58 +00:00
parent 19e970542d
commit 1d31290634
1 changed files with 2 additions and 1 deletions
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3
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -929,7 +929,8 @@ unsigned LoopStrengthReduce::CheckForIVReuse(const SCEVHandle &Stride,
for (std::map<SCEVHandle, IVsOfOneStride>::iterator SI= IVsByStride.begin(),
SE = IVsByStride.end(); SI != SE; ++SI) {
int64_t SSInt = cast<SCEVConstant>(SI->first)->getValue()->getSExtValue();
if (unsigned(abs(SInt)) < SSInt || (SInt % SSInt) != 0)
if (SInt != -SSInt &&
(unsigned(abs(SInt)) < SSInt || (SInt % SSInt) != 0))
continue;
int64_t Scale = SInt / SSInt;
// Check that this stride is valid for all the types used for loads and