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Fix PR1304 and Transforms/InstCombine/2007-04-08-SingleEltVectorCrash.ll

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llvm-svn: 35792
This commit is contained in:
Chris Lattner 2007-04-09 01:37:55 +00:00
parent 34065e8986
commit 218d43af10
1 changed files with 10 additions and 2 deletions
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12
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -8943,11 +8943,19 @@ 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 (ConstantInt *IdxC = dyn_cast<ConstantInt>(EI.getOperand(1))) {
unsigned IndexVal = IdxC->getZExtValue();
unsigned VectorWidth =
cast<VectorType>(EI.getOperand(0)->getType())->getNumElements();
// If this is extracting an invalid index, turn this into undef, to avoid
// crashing the code below.
if (IndexVal >= VectorWidth)
return ReplaceInstUsesWith(EI, UndefValue::get(EI.getType()));
// This instruction only demands the single element from the input vector.
// If the input vector has a single use, simplify it based on this use
// property.
uint64_t IndexVal = IdxC->getZExtValue();
if (EI.getOperand(0)->hasOneUse()) {
if (EI.getOperand(0)->hasOneUse() && VectorWidth != 1) {
uint64_t UndefElts;
if (Value *V = SimplifyDemandedVectorElts(EI.getOperand(0),
1 << IndexVal,