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Constant fold extractelement(zero, x) -> zero

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27479 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-04-07 04:44:06 +00:00
parent 8960766d45
commit f38d471445
1 changed files with 3 additions and 0 deletions
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lib/VMCore/ConstantFold.cpp
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@ -836,6 +836,9 @@ Constant *llvm::ConstantFoldExtractElementInstruction(const Constant *Val,
const Constant *Idx) {
if (isa<UndefValue>(Val)) // ee(undef, x) -> undef
return UndefValue::get(cast<PackedType>(Val->getType())->getElementType());
if (Val->isNullValue()) // ee(zero, x) -> zero
return Constant::getNullValue(
cast<PackedType>(Val->getType())->getElementType());
if (const ConstantPacked *CVal = dyn_cast<ConstantPacked>(Val)) {
if (const ConstantUInt *CIdx = dyn_cast<ConstantUInt>(Idx)) {