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Implement vec_shuffle.ll:test3

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27573 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-04-10 23:06:36 +00:00
parent 0bb1681337
commit 389a6f58f7
1 changed files with 17 additions and 2 deletions
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19
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -6779,7 +6779,8 @@ static bool CheapToScalarize(Value *V, bool isConstant) {
static Value *FindScalarElement(Value *V, unsigned EltNo) {
assert(isa<PackedType>(V->getType()) && "Not looking at a vector?");
const PackedType *PTy = cast<PackedType>(V->getType());
if (EltNo >= PTy->getNumElements()) // Out of range access.
unsigned Width = PTy->getNumElements();
if (EltNo >= Width) // Out of range access.
return UndefValue::get(PTy->getElementType());
if (isa<UndefValue>(V))
@ -6800,6 +6801,19 @@ static Value *FindScalarElement(Value *V, unsigned EltNo) {
// Otherwise, the insertelement doesn't modify the value, recurse on its
// vector input.
return FindScalarElement(III->getOperand(0), EltNo);
} else if (ShuffleVectorInst *SVI = dyn_cast<ShuffleVectorInst>(V)) {
if (isa<ConstantAggregateZero>(SVI->getOperand(2))) {
return FindScalarElement(SVI->getOperand(0), 0);
} else if (ConstantPacked *CP =
dyn_cast<ConstantPacked>(SVI->getOperand(2))) {
if (isa<UndefValue>(CP->getOperand(EltNo)))
return UndefValue::get(PTy->getElementType());
unsigned InEl = cast<ConstantUInt>(CP->getOperand(EltNo))->getValue();
if (InEl < Width)
return FindScalarElement(SVI->getOperand(0), InEl);
else
return FindScalarElement(SVI->getOperand(1), InEl - Width);
}
}
// Otherwise, we don't know.
@ -6831,9 +6845,10 @@ Instruction *InstCombiner::visitExtractElementInst(ExtractElementInst &EI) {
// If extracting a specified index from the vector, see if we can recursively
// find a previously computed scalar that was inserted into the vector.
if (ConstantUInt *IdxC = dyn_cast<ConstantUInt>(EI.getOperand(1)))
if (ConstantUInt *IdxC = dyn_cast<ConstantUInt>(EI.getOperand(1))) {
if (Value *Elt = FindScalarElement(EI.getOperand(0), IdxC->getValue()))
return ReplaceInstUsesWith(EI, Elt);
}
if (Instruction *I = dyn_cast<Instruction>(EI.getOperand(0)))
if (I->hasOneUse()) {