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[InstCombine] use SelectInst operand names to make code clearer; NFC

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Cleanup step for D51433.

llvm-svn: 341850
This commit is contained in:
Sanjay Patel 2018-09-10 18:37:59 +00:00
parent 2a2e81425b
commit 6ec4a8b575
1 changed files with 10 additions and 8 deletions
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18
lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
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@ -1260,13 +1260,15 @@ Value *InstCombiner::SimplifyDemandedVectorElts(Value *V, APInt DemandedElts,
break;
}
case Instruction::Select: {
SelectInst *Sel = cast<SelectInst>(I);
Value *Cond = Sel->getCondition();
APInt DemandedLHS(DemandedElts), DemandedRHS(DemandedElts);
if (auto *CV = dyn_cast<ConstantVector>(I->getOperand(0))) {
if (auto *CV = dyn_cast<ConstantVector>(Cond)) {
for (unsigned i = 0; i < VWidth; i++) {
// isNullValue() always returns false when called on a ConstantExpr.
// Skip constant expressions to avoid propagating incorrect information.
Constant *CElt = CV->getAggregateElement(i);
// Method isNullValue always returns false when called on a
// ConstantExpr. If CElt is a ConstantExpr then skip it in order to
// to avoid propagating incorrect information.
if (isa<ConstantExpr>(CElt))
continue;
if (CElt->isNullValue())
@ -1276,15 +1278,15 @@ Value *InstCombiner::SimplifyDemandedVectorElts(Value *V, APInt DemandedElts,
}
}
if (Value *V = SimplifyDemandedVectorElts(I->getOperand(1), DemandedLHS,
if (Value *V = SimplifyDemandedVectorElts(Sel->getTrueValue(), DemandedLHS,
UndefElts2, Depth + 1)) {
I->setOperand(1, V);
Sel->setTrueValue(V);
MadeChange = true;
}
if (Value *V = SimplifyDemandedVectorElts(I->getOperand(2), DemandedRHS,
if (Value *V = SimplifyDemandedVectorElts(Sel->getFalseValue(), DemandedRHS,
UndefElts3, Depth + 1)) {
I->setOperand(2, V);
Sel->setFalseValue(V);
MadeChange = true;
}