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Realize the individual pieces of an expanded copytoreg/store/load are

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independent of each other.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19700 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-01-19 18:02:17 +00:00
parent 39908e0ce0
commit ec39a45bdb
1 changed files with 16 additions and 9 deletions
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25
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -399,8 +399,10 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
SDOperand Lo, Hi;
ExpandOp(Node->getOperand(1), Lo, Hi);
unsigned Reg = cast<RegSDNode>(Node)->getReg();
Result = DAG.getCopyToReg(Tmp1, Lo, Reg);
Result = DAG.getCopyToReg(Result, Hi, Reg+1);
Lo = DAG.getCopyToReg(Tmp1, Lo, Reg);
Hi = DAG.getCopyToReg(Tmp1, Hi, Reg+1);
// Note that the copytoreg nodes are independent of each other.
Result = DAG.getNode(ISD::TokenFactor, MVT::Other, Lo, Hi);
assert(isTypeLegal(Result.getValueType()) &&
"Cannot expand multiple times yet (i64 -> i16)");
break;
@ -506,15 +508,16 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
if (!TLI.isLittleEndian())
std::swap(Lo, Hi);
// FIXME: These two stores are independent of each other!
Result = DAG.getNode(ISD::STORE, MVT::Other, Tmp1, Lo, Tmp2);
Lo = DAG.getNode(ISD::STORE, MVT::Other, Tmp1, Lo, Tmp2);
unsigned IncrementSize = MVT::getSizeInBits(Lo.getValueType())/8;
unsigned IncrementSize = MVT::getSizeInBits(Hi.getValueType())/8;
Tmp2 = DAG.getNode(ISD::ADD, Tmp2.getValueType(), Tmp2,
getIntPtrConstant(IncrementSize));
assert(isTypeLegal(Tmp2.getValueType()) &&
"Pointers must be legal!");
Result = DAG.getNode(ISD::STORE, MVT::Other, Result, Hi, Tmp2);
Hi = DAG.getNode(ISD::STORE, MVT::Other, Tmp1, Hi, Tmp2);
Result = DAG.getNode(ISD::TokenFactor, MVT::Other, Lo, Hi);
break;
}
break;
case ISD::TRUNCSTORE:
@ -1292,11 +1295,15 @@ void SelectionDAGLegalize::ExpandOp(SDOperand Op, SDOperand &Lo, SDOperand &Hi){
unsigned IncrementSize = MVT::getSizeInBits(Lo.getValueType())/8;
Ptr = DAG.getNode(ISD::ADD, Ptr.getValueType(), Ptr,
getIntPtrConstant(IncrementSize));
// FIXME: This load is independent of the first one.
Hi = DAG.getLoad(NVT, Lo.getValue(1), Ptr);
Hi = DAG.getLoad(NVT, Ch, Ptr);
// Build a factor node to remember that this load is independent of the
// other one.
SDOperand TF = DAG.getNode(ISD::TokenFactor, MVT::Other, Lo.getValue(1),
Hi.getValue(1));
// Remember that we legalized the chain.
AddLegalizedOperand(Op.getValue(1), Hi.getValue(1));
AddLegalizedOperand(Op.getValue(1), TF);
if (!TLI.isLittleEndian())
std::swap(Lo, Hi);
break;