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Fixed scalarizing an extract subvector and prevent an infinite loop

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when simplify a vector. 


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58820 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Mon P Wang
2008-11-06 22:52:21 +00:00
parent 703ccfe053
commit e0b436ac41
2 changed files with 9 additions and 3 deletions
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4
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@@ -7516,8 +7516,8 @@ SDValue SelectionDAGLegalize::ScalarizeVectorOp(SDValue Op) {
break; break;
} }
case ISD::EXTRACT_SUBVECTOR: case ISD::EXTRACT_SUBVECTOR:
Result = Node->getOperand(0); Result = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, NewVT, Node->getOperand(0),
assert(Result.getValueType() == NewVT); Node->getOperand(1));
break; break;
case ISD::BIT_CONVERT: { case ISD::BIT_CONVERT: {
SDValue Op0 = Op.getOperand(0); SDValue Op0 = Op.getOperand(0);

6
lib/Transforms/Scalar/InstructionCombining.cpp
View File

@@ -1410,6 +1410,12 @@ Value *InstCombiner::SimplifyDemandedVectorElts(Value *V, uint64_t DemandedElts,
} else if (isa<ConstantAggregateZero>(V)) { } else if (isa<ConstantAggregateZero>(V)) {
// Simplify the CAZ to a ConstantVector where the non-demanded elements are // Simplify the CAZ to a ConstantVector where the non-demanded elements are
// set to undef. // set to undef.
// Check if this is identity. If so, return 0 since we are not simplifying
// anything.
if (DemandedElts == ((1ULL << VWidth) -1))
return 0;
const Type *EltTy = cast<VectorType>(V->getType())->getElementType(); const Type *EltTy = cast<VectorType>(V->getType())->getElementType();
Constant *Zero = Constant::getNullValue(EltTy); Constant *Zero = Constant::getNullValue(EltTy);
Constant *Undef = UndefValue::get(EltTy); Constant *Undef = UndefValue::get(EltTy);