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Added pre-indexed store support.

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llvm-svn: 31459
This commit is contained in:
Evan Cheng 2006-11-05 09:31:14 +00:00
parent ae357e5044
commit bf7db95159
1 changed files with 24 additions and 10 deletions
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34
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -175,9 +175,13 @@ namespace {
}
bool CombineToIndexedLoadStore(SDNode *N) {
bool isLoad = true;
SDOperand Ptr;
if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
Ptr = LD->getBasePtr();
} else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
Ptr = ST->getBasePtr();
isLoad = false;
} else
return false;
@ -234,10 +238,9 @@ namespace {
if (Use->isPredecessor(N))
return false;
if (!OffIsAMImm)
if (!OffIsAMImm) {
NumRealUses++;
// FIXME: Do we need a target hook here
else if (Use->getOpcode() == ISD::LOAD) {
} else if (Use->getOpcode() == ISD::LOAD) {
if (cast<LoadSDNode>(Use)->getBasePtr().Val != Ptr.Val)
NumRealUses++;
} else if (Use->getOpcode() == ISD::STORE) {
@ -249,17 +252,23 @@ namespace {
if (NumRealUses == 0)
return false;
SDOperand Result =
DAG.getIndexedLoad(SDOperand(N,0), BasePtr, Offset, AM);
SDOperand Result = isLoad
? DAG.getIndexedLoad(SDOperand(N,0), BasePtr, Offset, AM)
: DAG.getIndexedStore(SDOperand(N,0), BasePtr, Offset, AM);
++NodesCombined;
DEBUG(std::cerr << "\nReplacing.4 "; N->dump();
std::cerr << "\nWith: "; Result.Val->dump(&DAG);
std::cerr << '\n');
std::vector<SDNode*> NowDead;
DAG.ReplaceAllUsesOfValueWith(SDOperand(N, 0), Result.getValue(0),
NowDead);
DAG.ReplaceAllUsesOfValueWith(SDOperand(N, 1), Result.getValue(2),
NowDead);
if (isLoad) {
DAG.ReplaceAllUsesOfValueWith(SDOperand(N, 0), Result.getValue(0),
NowDead);
DAG.ReplaceAllUsesOfValueWith(SDOperand(N, 1), Result.getValue(2),
NowDead);
} else {
DAG.ReplaceAllUsesOfValueWith(SDOperand(N, 0), Result.getValue(1),
NowDead);
}
// Nodes can end up on the worklist more than once. Make sure we do
// not process a node that has been replaced.
@ -269,7 +278,8 @@ namespace {
DAG.DeleteNode(N);
// Replace the uses of Ptr with uses of the updated base value.
DAG.ReplaceAllUsesOfValueWith(Ptr, Result.getValue(1), NowDead);
DAG.ReplaceAllUsesOfValueWith(Ptr, Result.getValue(isLoad ? 1 : 0),
NowDead);
removeFromWorkList(Ptr.Val);
for (unsigned i = 0, e = NowDead.size(); i != e; ++i)
removeFromWorkList(NowDead[i]);
@ -2906,6 +2916,10 @@ SDOperand DAGCombiner::visitSTORE(SDNode *N) {
}
}
// Try transforming N to an indexed store.
if (CombineToIndexedLoadStore(N))
return SDOperand(N, 0);
return SDOperand();
}