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Alias analysis of TRUNCSTORE. 

llvm-svn: 30889
This commit is contained in:
Jim Laskey 2006-10-11 18:55:16 +00:00
parent c52dab5894
commit a13b9c7aa4
1 changed files with 28 additions and 1 deletions
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29
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -503,6 +503,8 @@ SDOperand DAGCombiner::visit(SDNode *N) {
case ISD::BRCOND: return visitBRCOND(N);
case ISD::BR_CC: return visitBR_CC(N);
case ISD::LOAD: return visitLOAD(N);
// FIXME - Switch over after StoreSDNode comes online.
case ISD::TRUNCSTORE: // Fail thru
case ISD::STORE: return visitSTORE(N);
case ISD::INSERT_VECTOR_ELT: return visitINSERT_VECTOR_ELT(N);
case ISD::VINSERT_VECTOR_ELT: return visitVINSERT_VECTOR_ELT(N);
@ -2696,6 +2698,24 @@ SDOperand DAGCombiner::visitSTORE(SDNode *N) {
SDOperand Value = N->getOperand(1);
SDOperand Ptr = N->getOperand(2);
SDOperand SrcValue = N->getOperand(3);
// FIXME - Switch over after StoreSDNode comes online.
if (N->getOpcode() == ISD::TRUNCSTORE) {
if (CombinerAA) {
// Walk up chain skipping non-aliasing memory nodes.
SDOperand BetterChain = FindBetterChain(N, Chain);
// If there is a better chain.
if (Chain != BetterChain) {
// Replace the chain to avoid dependency.
SDOperand ReplTStore = DAG.getStore(BetterChain, Value, Ptr, SrcValue);
// Create token to keep both nodes around.
return DAG.getNode(ISD::TokenFactor, MVT::Other, Chain, ReplTStore);
}
}
return SDOperand();
}
// If this is a store that kills a previous store, remove the previous store.
if (Chain.getOpcode() == ISD::STORE && Chain.getOperand(2) == Ptr &&
@ -3996,7 +4016,7 @@ bool DAGCombiner::FindAliasInfo(SDNode *N,
SrcValue = LD->getSrcValue();
return true;
} else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
#if 1 //FIXME - Switch over after StoreSDNode comes online.
#if 1 // FIXME - Switch over after StoreSDNode comes online.
Ptr = ST->getOperand(2);
Size = MVT::getSizeInBits(ST->getOperand(1).getValueType()) >> 3;
SrcValue = 0;
@ -4005,6 +4025,11 @@ bool DAGCombiner::FindAliasInfo(SDNode *N,
Size = MVT::getSizeInBits(ST->getOperand(1).getValueType()) >> 3;
SrcValue = ST->getSrcValue();
#endif
// FIXME - Switch over after StoreSDNode comes online.
} else if (N->getOpcode() == ISD::TRUNCSTORE) {
Ptr = N->getOperand(2);
Size = MVT::getSizeInBits(cast<VTSDNode>(N->getOperand(4))->getVT()) >> 3;
SrcValue = 0;
} else {
assert(0 && "FindAliasInfo expected a memory operand");
}
@ -4045,6 +4070,8 @@ void DAGCombiner::GatherAllAliases(SDNode *N, SDOperand OriginalChain,
break;
case ISD::LOAD:
// FIXME - Switch over after StoreSDNode comes online.
case ISD::TRUNCSTORE:
case ISD::STORE: {
// Get alias information for Chain.
SDOperand OpPtr;