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Try to produce better code when scalarizing VSETCC.

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llvm-svn: 58920
This commit is contained in:
Duncan Sands 2008-11-08 18:26:48 +00:00
parent e3b9284fa8
commit da4e03de04
1 changed files with 26 additions and 8 deletions
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34
lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
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@ -181,16 +181,34 @@ SDValue DAGTypeLegalizer::ScalarizeVecRes_VECTOR_SHUFFLE(SDNode *N) {
}
SDValue DAGTypeLegalizer::ScalarizeVecRes_VSETCC(SDNode *N) {
MVT NewVT = N->getValueType(0).getVectorElementType();
SDValue LHS = GetScalarizedVector(N->getOperand(0));
SDValue RHS = GetScalarizedVector(N->getOperand(1));
LHS = DAG.getNode(ISD::SETCC, TLI.getSetCCResultType(LHS), LHS, RHS,
N->getOperand(2));
return
DAG.getNode(ISD::SELECT, NewVT, LHS,
DAG.getConstant(APInt::getAllOnesValue(NewVT.getSizeInBits()),
NewVT),
DAG.getConstant(0ULL, NewVT));
MVT NVT = N->getValueType(0).getVectorElementType();
MVT SVT = TLI.getSetCCResultType(LHS);
// Turn it into a scalar SETCC.
SDValue Res = DAG.getNode(ISD::SETCC, SVT, LHS, RHS, N->getOperand(2));
// VSETCC always returns a sign-extended value, while SETCC may not. The
// SETCC result type may not match the vector element type. Correct these.
if (NVT.getSizeInBits() <= SVT.getSizeInBits()) {
// The SETCC result type is bigger than the vector element type.
// Ensure the SETCC result is sign-extended.
if (TLI.getSetCCResultContents() !=
TargetLowering::ZeroOrNegativeOneSetCCResult)
Res = DAG.getNode(ISD::SIGN_EXTEND_INREG, SVT, Res,
DAG.getValueType(MVT::i1));
// Truncate to the final type.
return DAG.getNode(ISD::TRUNCATE, NVT, Res);
} else {
// The SETCC result type is smaller than the vector element type.
// If the SetCC result is not sign-extended, chop it down to MVT::i1.
if (TLI.getSetCCResultContents() !=
TargetLowering::ZeroOrNegativeOneSetCCResult)
Res = DAG.getNode(ISD::TRUNCATE, MVT::i1, Res);
// Sign extend to the final type.
return DAG.getNode(ISD::SIGN_EXTEND, NVT, Res);
}
}