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| author | Dan Gohman <gohman@apple.com> | 2009-05-27 20:00:18 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2009-05-27 20:00:18 +0000 |
| commit | ead28bd04bf42cdf8c29d12fa4c0f9d29a4c58cd (patch) | |
| tree | 7cda959f58fdcdbb34927dbabccb80f8f139f630 /lib/Transforms/Scalar | |
| parent | bc9be219d69c705097867d4c2277e5aee3f82e7f (diff) | |
| download | external_llvm-ead28bd04bf42cdf8c29d12fa4c0f9d29a4c58cd.zip external_llvm-ead28bd04bf42cdf8c29d12fa4c0f9d29a4c58cd.tar.gz external_llvm-ead28bd04bf42cdf8c29d12fa4c0f9d29a4c58cd.tar.bz2 | |
In ChangeCompareStride, when the stride to be reused is truncated to
a smaller type, promoted its offset back up to the type of the new
comparison. This fixes PR4222.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72493 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Scalar')
| -rw-r--r-- | lib/Transforms/Scalar/LoopStrengthReduce.cpp | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/lib/Transforms/Scalar/LoopStrengthReduce.cpp index adfa527..834a95d 100644 --- a/lib/Transforms/Scalar/LoopStrengthReduce.cpp +++ b/lib/Transforms/Scalar/LoopStrengthReduce.cpp @@ -2005,11 +2005,16 @@ ICmpInst *LoopStrengthReduce::ChangeCompareStride(Loop *L, ICmpInst *Cond, ConstantInt *CI = ConstantInt::get(NewCmpIntTy, NewCmpVal); NewCmpRHS = ConstantExpr::getIntToPtr(CI, NewCmpTy); } + NewOffset = CondUse->getOffset(); + if (CondUse->isSigned()) + NewOffset = SE->getNoopOrSignExtend(CondUse->getOffset(), NewCmpTy); + else + NewOffset = SE->getNoopOrZeroExtend(CondUse->getOffset(), NewCmpTy); NewOffset = TyBits == NewTyBits - ? SE->getMulExpr(CondUse->getOffset(), + ? SE->getMulExpr(NewOffset, SE->getConstant(ConstantInt::get(CmpTy, Scale))) : SE->getConstant(ConstantInt::get(NewCmpIntTy, - cast<SCEVConstant>(CondUse->getOffset())->getValue() + cast<SCEVConstant>(NewOffset)->getValue() ->getSExtValue()*Scale)); break; } |