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Reapply 42677.

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llvm-svn: 42692
This commit is contained in:
Evan Cheng 2007-10-06 08:19:55 +00:00
parent c6b349980a
commit 0eed7948ce
1 changed files with 52 additions and 3 deletions
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55
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -263,6 +263,7 @@ namespace {
SDOperand visitLOAD(SDNode *N);
SDOperand visitSTORE(SDNode *N);
SDOperand visitINSERT_VECTOR_ELT(SDNode *N);
SDOperand visitEXTRACT_VECTOR_ELT(SDNode *N);
SDOperand visitBUILD_VECTOR(SDNode *N);
SDOperand visitCONCAT_VECTORS(SDNode *N);
SDOperand visitVECTOR_SHUFFLE(SDNode *N);
@ -682,6 +683,7 @@ SDOperand DAGCombiner::visit(SDNode *N) {
case ISD::LOAD: return visitLOAD(N);
case ISD::STORE: return visitSTORE(N);
case ISD::INSERT_VECTOR_ELT: return visitINSERT_VECTOR_ELT(N);
case ISD::EXTRACT_VECTOR_ELT: return visitEXTRACT_VECTOR_ELT(N);
case ISD::BUILD_VECTOR: return visitBUILD_VECTOR(N);
case ISD::CONCAT_VECTORS: return visitCONCAT_VECTORS(N);
case ISD::VECTOR_SHUFFLE: return visitVECTOR_SHUFFLE(N);
@ -2907,9 +2909,8 @@ SDOperand DAGCombiner::visitBIT_CONVERT(SDNode *N) {
return DAG.getNode(ISD::BIT_CONVERT, VT, N0.getOperand(0));
// fold (conv (load x)) -> (load (conv*)x)
// If the resultant load doesn't need a higher alignment than the original!
if (ISD::isNON_EXTLoad(N0.Val) && N0.hasOneUse() &&
ISD::isUNINDEXEDLoad(N0.Val) &&
// If the resultant load doesn't need a higher alignment than the original!
if (ISD::isNormalLoad(N0.Val) && N0.hasOneUse() &&
TLI.isOperationLegal(ISD::LOAD, VT)) {
LoadSDNode *LN0 = cast<LoadSDNode>(N0);
unsigned Align = TLI.getTargetMachine().getTargetData()->
@ -3901,6 +3902,54 @@ SDOperand DAGCombiner::visitINSERT_VECTOR_ELT(SDNode *N) {
return SDOperand();
}
SDOperand DAGCombiner::visitEXTRACT_VECTOR_ELT(SDNode *N) {
SDOperand InVec = N->getOperand(0);
SDOperand EltNo = N->getOperand(1);
// (vextract (v4f32 s2v (f32 load $addr)), 0) -> (f32 load $addr)
// (vextract (v4i32 bc (v4f32 s2v (f32 load $addr))), 0) -> (i32 load $addr)
if (isa<ConstantSDNode>(EltNo)) {
unsigned Elt = cast<ConstantSDNode>(EltNo)->getValue();
bool NewLoad = false;
if (Elt == 0) {
MVT::ValueType VT = InVec.getValueType();
MVT::ValueType EVT = MVT::getVectorElementType(VT);
MVT::ValueType LVT = EVT;
unsigned NumElts = MVT::getVectorNumElements(VT);
if (InVec.getOpcode() == ISD::BIT_CONVERT) {
MVT::ValueType BCVT = InVec.getOperand(0).getValueType();
if (NumElts != MVT::getVectorNumElements(BCVT))
return SDOperand();
InVec = InVec.getOperand(0);
EVT = MVT::getVectorElementType(BCVT);
NewLoad = true;
}
if (InVec.getOpcode() == ISD::SCALAR_TO_VECTOR &&
InVec.getOperand(0).getValueType() == EVT &&
ISD::isNormalLoad(InVec.getOperand(0).Val) &&
InVec.getOperand(0).hasOneUse()) {
LoadSDNode *LN0 = cast<LoadSDNode>(InVec.getOperand(0));
unsigned Align = LN0->getAlignment();
if (NewLoad) {
// Check the resultant load doesn't need a higher alignment than the
// original load.
unsigned NewAlign = TLI.getTargetMachine().getTargetData()->
getABITypeAlignment(MVT::getTypeForValueType(LVT));
if (!TLI.isOperationLegal(ISD::LOAD, LVT) || NewAlign > Align)
return SDOperand();
Align = NewAlign;
}
return DAG.getLoad(LVT, LN0->getChain(), LN0->getBasePtr(),
LN0->getSrcValue(), LN0->getSrcValueOffset(),
LN0->isVolatile(), Align);
}
}
}
return SDOperand();
}
SDOperand DAGCombiner::visitBUILD_VECTOR(SDNode *N) {
unsigned NumInScalars = N->getNumOperands();
MVT::ValueType VT = N->getValueType(0);