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extractelement(undef,x) -> undef
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27300 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -6655,12 +6655,14 @@ static bool CheapToScalarize(Value *V, bool isConstant) {
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}
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Instruction *InstCombiner::visitExtractElementInst(ExtractElementInst &EI) {
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if (ConstantAggregateZero *C =
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dyn_cast<ConstantAggregateZero>(EI.getOperand(0))) {
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// If packed val is constant 0, replace extract with scalar 0
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const Type *Ty = cast<PackedType>(C->getType())->getElementType();
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return ReplaceInstUsesWith(EI, Constant::getNullValue(Ty));
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}
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// If packed val is undef, replace extract with scalar undef.
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if (isa<UndefValue>(EI.getOperand(0)))
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return ReplaceInstUsesWith(EI, UndefValue::get(EI.getType()));
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// If packed val is constant 0, replace extract with scalar 0.
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if (isa<ConstantAggregateZero>(EI.getOperand(0)))
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return ReplaceInstUsesWith(EI, Constant::getNullValue(EI.getType()));
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if (ConstantPacked *C = dyn_cast<ConstantPacked>(EI.getOperand(0))) {
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// If packed val is constant with uniform operands, replace EI
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// with that operand
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