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Lower memcpy with small constant size operand into a series of load / store

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ops.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26195 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2006-02-15 01:54:51 +00:00
parent 6d9d13d2e4
commit c080d6fb3d
1 changed files with 34 additions and 8 deletions
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42
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -1641,18 +1641,44 @@ void SelectionDAGLowering::visitMemIntrinsic(CallInst &I, unsigned Op) {
MVT::ValueType VT = MemOps[i];
unsigned VTSize = getSizeInBits(VT) / 8;
SDOperand Value = getMemsetValue(Op2, VT, DAG);
OutChains.
push_back(DAG.getNode(ISD::STORE, MVT::Other, getRoot(),
Value,
getMemBasePlusOffset(Op1, Offset, DAG, TLI),
DAG.getSrcValue(NULL)));
SDOperand Store = DAG.getNode(ISD::STORE, MVT::Other, getRoot(),
Value,
getMemBasePlusOffset(Op1, Offset, DAG, TLI),
DAG.getSrcValue(I.getOperand(1), Offset));
OutChains.push_back(Store);
Offset += VTSize;
}
DAG.setRoot(DAG.getNode(ISD::TokenFactor, MVT::Other, OutChains));
return;
}
break;
}
case ISD::MEMCPY: {
if (MeetsMaxMemopRequirement(MemOps, TLI.getMaxStoresPerMemcpy(),
Size->getValue(), Align, TLI)) {
unsigned NumMemOps = MemOps.size();
unsigned Offset = 0;
for (unsigned i = 0; i < NumMemOps; i++) {
MVT::ValueType VT = MemOps[i];
unsigned VTSize = getSizeInBits(VT) / 8;
SDOperand Value =
DAG.getLoad(VT, getRoot(),
getMemBasePlusOffset(Op2, Offset, DAG, TLI),
DAG.getSrcValue(I.getOperand(2), Offset));
SDOperand Store =
DAG.getNode(ISD::STORE, MVT::Other, Value.getValue(1),
Value,
getMemBasePlusOffset(Op1, Offset, DAG, TLI),
DAG.getSrcValue(I.getOperand(1), Offset));
OutChains.push_back(Store);
Offset += VTSize;
}
}
break;
}
}
if (!OutChains.empty()) {
DAG.setRoot(DAG.getNode(ISD::TokenFactor, MVT::Other, OutChains));
return;
}
}