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Simplify by using dyn_cast instead of isa and cast. 

llvm-svn: 64917
This commit is contained in:
Dan Gohman 2009-02-18 16:54:33 +00:00
parent 7f1c0afc19
commit aa0f01929b
1 changed files with 5 additions and 6 deletions
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11
llvm/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 // 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 // we can easily determine if the start value is not a maximum value
// which would wrap on the first iteration. // which would wrap on the first iteration.
const Value *InitialVal = PN->getIncomingValue(IncomingEdge); const ConstantInt *InitialVal =
if (!isa<ConstantInt>(InitialVal)) dyn_cast<ConstantInt>(PN->getIncomingValue(IncomingEdge));
if (!InitialVal)
return 0; return 0;
// The original induction variable will start at some non-max value, // The original induction variable will start at some non-max value,
// it counts up by one, and the loop iterates only while it remans // 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. // less than some value in the same type. As such, it will never wrap.
if (isSigned && if (isSigned && !InitialVal->getValue().isMaxSignedValue())
!cast<ConstantInt>(InitialVal)->getValue().isMaxSignedValue())
NoSignedWrap = true; NoSignedWrap = true;
else if (!isSigned && else if (!isSigned && !InitialVal->getValue().isMaxValue())
!cast<ConstantInt>(InitialVal)->getValue().isMaxValue())
NoUnsignedWrap = true; NoUnsignedWrap = true;
return PN; return PN;
} }