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Implement small-arguments.ll:test3 by teaching the DAG optimizer that
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
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@ -613,8 +613,12 @@ PPC32TargetLowering::LowerCallTo(SDOperand Chain,
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std::vector<MVT::ValueType> RetVals;
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MVT::ValueType RetTyVT = getValueType(RetTy);
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MVT::ValueType ActualRetTyVT = RetTyVT;
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if (RetTyVT >= MVT::i1 && RetTyVT <= MVT::i16)
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ActualRetTyVT = MVT::i32; // Promote result to i32.
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if (RetTyVT != MVT::isVoid)
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RetVals.push_back(RetTyVT);
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RetVals.push_back(ActualRetTyVT);
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RetVals.push_back(MVT::Other);
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SDOperand TheCall = SDOperand(DAG.getCall(RetVals,
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@ -622,7 +626,17 @@ PPC32TargetLowering::LowerCallTo(SDOperand Chain,
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Chain = TheCall.getValue(RetTyVT != MVT::isVoid);
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Chain = DAG.getNode(ISD::CALLSEQ_END, MVT::Other, Chain,
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DAG.getConstant(NumBytes, getPointerTy()));
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return std::make_pair(TheCall, Chain);
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SDOperand RetVal = TheCall;
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// If the result is a small value, add a note so that we keep track of the
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// information about whether it is sign or zero extended.
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if (RetTyVT != ActualRetTyVT) {
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RetVal = DAG.getNode(RetTy->isSigned() ? ISD::AssertSext : ISD::AssertZext,
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MVT::i32, RetVal, DAG.getValueType(RetTyVT));
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RetVal = DAG.getNode(ISD::TRUNCATE, RetTyVT, RetVal);
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}
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return std::make_pair(RetVal, Chain);
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}
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SDOperand PPC32TargetLowering::LowerVAStart(SDOperand Chain, SDOperand VAListP,
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