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Legalize BRCONDTWOWAY into a BRCOND/BR pair if a target doesn't support it.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21166 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-04-09 03:30:19 +00:00
parent ef847df087
commit 411e888c1b
1 changed files with 33 additions and 0 deletions
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33
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -391,6 +391,39 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
Result = DAG.getNode(ISD::BRCOND, MVT::Other, Tmp1, Tmp2,
Node->getOperand(2));
break;
case ISD::BRCONDTWOWAY:
Tmp1 = LegalizeOp(Node->getOperand(0)); // Legalize the chain.
switch (getTypeAction(Node->getOperand(1).getValueType())) {
case Expand: assert(0 && "It's impossible to expand bools");
case Legal:
Tmp2 = LegalizeOp(Node->getOperand(1)); // Legalize the condition.
break;
case Promote:
Tmp2 = PromoteOp(Node->getOperand(1)); // Promote the condition.
break;
}
// If this target does not support BRCONDTWOWAY, lower it to a BRCOND/BR
// pair.
switch (TLI.getOperationAction(ISD::BRCONDTWOWAY, MVT::Other)) {
case TargetLowering::Promote:
default: assert(0 && "This action is not supported yet!");
case TargetLowering::Legal:
if (Tmp1 != Node->getOperand(0) || Tmp2 != Node->getOperand(1)) {
std::vector<SDOperand> Ops;
Ops.push_back(Tmp1);
Ops.push_back(Tmp2);
Ops.push_back(Node->getOperand(2));
Ops.push_back(Node->getOperand(3));
Result = DAG.getNode(ISD::BRCONDTWOWAY, MVT::Other, Ops);
}
break;
case TargetLowering::Expand:
Result = DAG.getNode(ISD::BRCOND, MVT::Other, Tmp1, Tmp2,
Node->getOperand(2));
Result = DAG.getNode(ISD::BR, MVT::Other, Result, Node->getOperand(3));
break;
}
break;
case ISD::LOAD:
Tmp1 = LegalizeOp(Node->getOperand(0)); // Legalize the chain.