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Allow targets to custom lower expanded BIT_CONVERT's

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30217 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-09-09 00:20:27 +00:00
parent 94be248dbb
commit f3f333dbd6
1 changed files with 15 additions and 2 deletions
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17
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -4457,8 +4457,21 @@ void SelectionDAGLegalize::ExpandOp(SDOperand Op, SDOperand &Lo, SDOperand &Hi){
break;
case ISD::BIT_CONVERT: {
SDOperand Tmp = ExpandBIT_CONVERT(Node->getValueType(0),
Node->getOperand(0));
SDOperand Tmp;
if (TLI.getOperationAction(ISD::BIT_CONVERT, VT) == TargetLowering::Custom){
// If the target wants to, allow it to lower this itself.
switch (getTypeAction(Node->getOperand(0).getValueType())) {
case Expand: assert(0 && "cannot expand FP!");
case Legal: Tmp = LegalizeOp(Node->getOperand(0)); break;
case Promote: Tmp = PromoteOp (Node->getOperand(0)); break;
}
Tmp = TLI.LowerOperation(DAG.getNode(ISD::BIT_CONVERT, VT, Tmp), DAG);
}
// Turn this into a load/store pair by default.
if (Tmp.Val == 0)
Tmp = ExpandBIT_CONVERT(Node->getValueType(0), Node->getOperand(0));
ExpandOp(Tmp, Lo, Hi);
break;
}