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Add the ability to lower return instructions to TargetLowering. This

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allows us to lower legal return types to something else, to meet ABI
requirements (such as that i64 be returned in two i32 regs on Darwin/ppc).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23802 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nate Begeman
2005-10-18 23:23:37 +00:00
parent d222f6ab67
commit 4a95945fa5
5 changed files with 45 additions and 7 deletions
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13
lib/Target/PowerPC/PPCISelLowering.cpp
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@@ -693,6 +693,19 @@ PPCTargetLowering::LowerCallTo(SDOperand Chain,
return std::make_pair(RetVal, Chain);
}
SDOperand PPCTargetLowering::LowerReturnTo(SDOperand Chain, SDOperand Op,
SelectionDAG &DAG) {
if (Op.getValueType() == MVT::i64) {
SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op,
DAG.getConstant(1, MVT::i32));
SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op,
DAG.getConstant(0, MVT::i32));
return DAG.getNode(ISD::RET, MVT::Other, Chain, Lo, Hi);
} else {
return DAG.getNode(ISD::RET, MVT::Other, Chain, Op);
}
}
SDOperand PPCTargetLowering::LowerVAStart(SDOperand Chain, SDOperand VAListP,
Value *VAListV, SelectionDAG &DAG) {
// vastart just stores the address of the VarArgsFrameIndex slot into the