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Implement small-arguments.ll:test3 by teaching the DAG optimizer that

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the results of calls to functions returning small values are properly
sign/zero extended.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23198 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2005-09-01 23:44:32 +00:00
parent 9832ce0f0a
commit 2a00daac58
1 changed files with 16 additions and 2 deletions
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18
lib/Target/PowerPC/PPCISelLowering.cpp
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@ -613,8 +613,12 @@ PPC32TargetLowering::LowerCallTo(SDOperand Chain,
std::vector<MVT::ValueType> RetVals; std::vector<MVT::ValueType> RetVals;
MVT::ValueType RetTyVT = getValueType(RetTy); MVT::ValueType RetTyVT = getValueType(RetTy);
MVT::ValueType ActualRetTyVT = RetTyVT;
if (RetTyVT >= MVT::i1 && RetTyVT <= MVT::i16)
ActualRetTyVT = MVT::i32; // Promote result to i32.
if (RetTyVT != MVT::isVoid) if (RetTyVT != MVT::isVoid)
RetVals.push_back(RetTyVT); RetVals.push_back(ActualRetTyVT);
RetVals.push_back(MVT::Other); RetVals.push_back(MVT::Other);
SDOperand TheCall = SDOperand(DAG.getCall(RetVals, SDOperand TheCall = SDOperand(DAG.getCall(RetVals,
@ -622,7 +626,17 @@ PPC32TargetLowering::LowerCallTo(SDOperand Chain,
Chain = TheCall.getValue(RetTyVT != MVT::isVoid); Chain = TheCall.getValue(RetTyVT != MVT::isVoid);
Chain = DAG.getNode(ISD::CALLSEQ_END, MVT::Other, Chain, Chain = DAG.getNode(ISD::CALLSEQ_END, MVT::Other, Chain,
DAG.getConstant(NumBytes, getPointerTy())); DAG.getConstant(NumBytes, getPointerTy()));
return std::make_pair(TheCall, Chain); SDOperand RetVal = TheCall;
// If the result is a small value, add a note so that we keep track of the
// information about whether it is sign or zero extended.
if (RetTyVT != ActualRetTyVT) {
RetVal = DAG.getNode(RetTy->isSigned() ? ISD::AssertSext : ISD::AssertZext,
MVT::i32, RetVal, DAG.getValueType(RetTyVT));
RetVal = DAG.getNode(ISD::TRUNCATE, RetTyVT, RetVal);
}
return std::make_pair(RetVal, Chain);
} }
SDOperand PPC32TargetLowering::LowerVAStart(SDOperand Chain, SDOperand VAListP, SDOperand PPC32TargetLowering::LowerVAStart(SDOperand Chain, SDOperand VAListP,