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Simplify by using dyn_cast instead of isa and cast.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64917 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2009-02-18 16:54:33 +00:00
parent b317143ba8
commit cad24c9abc
1 changed files with 5 additions and 6 deletions
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11
lib/Transforms/Scalar/IndVarSimplify.cpp
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@ -582,18 +582,17 @@ static const PHINode *TestOrigIVForWrap(const Loop *L,
// For now, only analyze loops with a constant start value, so that
// we can easily determine if the start value is not a maximum value
// which would wrap on the first iteration.
const Value *InitialVal = PN->getIncomingValue(IncomingEdge);
if (!isa<ConstantInt>(InitialVal))
const ConstantInt *InitialVal =
dyn_cast<ConstantInt>(PN->getIncomingValue(IncomingEdge));
if (!InitialVal)
return 0;
// The original induction variable will start at some non-max value,
// it counts up by one, and the loop iterates only while it remans
// less than some value in the same type. As such, it will never wrap.
if (isSigned &&
!cast<ConstantInt>(InitialVal)->getValue().isMaxSignedValue())
if (isSigned && !InitialVal->getValue().isMaxSignedValue())
NoSignedWrap = true;
else if (!isSigned &&
!cast<ConstantInt>(InitialVal)->getValue().isMaxValue())
else if (!isSigned && !InitialVal->getValue().isMaxValue())
NoUnsignedWrap = true;
return PN;
}