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Handle aliasing of loadext.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30883 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Laskey 2006-10-11 17:47:52 +00:00
parent 98dd175f86
commit c2b19f3449
1 changed files with 19 additions and 15 deletions
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34
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -2649,16 +2649,15 @@ SDOperand DAGCombiner::visitLOAD(SDNode *N) {
if (N->hasNUsesOfValue(0, 0))
return CombineTo(N, DAG.getNode(ISD::UNDEF, N->getValueType(0)), Chain);
if (!ISD::isNON_EXTLoad(N))
return SDOperand();
// If this load is directly stored, replace the load value with the stored
// value.
// TODO: Handle store large -> read small portion.
// TODO: Handle TRUNCSTORE/EXTLOAD
if (Chain.getOpcode() == ISD::STORE && Chain.getOperand(2) == Ptr &&
Chain.getOperand(1).getValueType() == N->getValueType(0))
return CombineTo(N, Chain.getOperand(1), Chain);
// TODO: Handle TRUNCSTORE/LOADEXT
if (LD->getExtensionType() == ISD::NON_EXTLOAD) {
if (Chain.getOpcode() == ISD::STORE && Chain.getOperand(2) == Ptr &&
Chain.getOperand(1).getValueType() == N->getValueType(0))
return CombineTo(N, Chain.getOperand(1), Chain);
}
if (CombinerAA) {
// Walk up chain skipping non-aliasing memory nodes.
@ -2666,9 +2665,19 @@ SDOperand DAGCombiner::visitLOAD(SDNode *N) {
// If there is a better chain.
if (Chain != BetterChain) {
SDOperand ReplLoad;
// Replace the chain to void dependency.
SDOperand ReplLoad = DAG.getLoad(N->getValueType(0), BetterChain, Ptr,
LD->getSrcValue(), LD->getSrcValueOffset());
if (LD->getExtensionType() == ISD::NON_EXTLOAD) {
ReplLoad = DAG.getLoad(N->getValueType(0), BetterChain, Ptr,
LD->getSrcValue(), LD->getSrcValueOffset());
} else {
ReplLoad = DAG.getExtLoad(LD->getExtensionType(),
LD->getValueType(0),
BetterChain, Ptr, LD->getSrcValue(),
LD->getSrcValueOffset(),
LD->getLoadedVT());
}
// Create token factor to keep old chain connected.
SDOperand Token = DAG.getNode(ISD::TokenFactor, MVT::Other,
@ -3983,7 +3992,7 @@ bool DAGCombiner::FindAliasInfo(SDNode *N,
SDOperand &Ptr, int64_t &Size, const Value *&SrcValue) {
if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
Ptr = LD->getBasePtr();
Size = MVT::getSizeInBits(N->getValueType(0)) >> 3;
Size = MVT::getSizeInBits(LD->getLoadedVT()) >> 3;
SrcValue = LD->getSrcValue();
return true;
} else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
@ -4036,11 +4045,6 @@ void DAGCombiner::GatherAllAliases(SDNode *N, SDOperand OriginalChain,
break;
case ISD::LOAD:
if (!ISD::isNON_EXTLoad(N)) {
Aliases.push_back(Chain);
break;
}
// Pass thru.
case ISD::STORE: {
// Get alias information for Chain.
SDOperand OpPtr;