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In ChangeCompareStride, when the stride to be reused is truncated to

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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
This commit is contained in:
Dan Gohman
2009-05-27 20:00:18 +00:00
parent bc9be219d6
commit ead28bd04b
2 changed files with 40 additions and 2 deletions
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9
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@@ -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;
}