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Fix optimization of select_cc seteq X, 0, 1, 0 -> srl (ctlz X), log2 X size
llvm-svn: 22995
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@ -854,9 +854,9 @@ SDOperand SelectionDAG::SimplifySelectCC(SDOperand N1, SDOperand N2,
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}
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// Check to see if this is the equivalent of seteq X, 0.
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// select_cc seteq X, 0, 1, 0 -> setcc X, 0, seteq -> srl (ctlz X), size(X)-1
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// select_cc eq X, 0, 1, 0 -> setcc X, 0, eq -> srl (ctlz X), log2(size(X))
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if (N2C && N2C->isNullValue() && N4C && N4C->isNullValue() &&
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N3C && (N3C->getValue() == 1)) {
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N3C && (N3C->getValue() == 1ULL) && CC == ISD::SETEQ) {
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MVT::ValueType XType = N1.getValueType();
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if (TLI.getOperationAction(ISD::SETCC, TLI.getSetCCResultTy()) ==
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TargetLowering::Legal) {
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@ -865,7 +865,7 @@ SDOperand SelectionDAG::SimplifySelectCC(SDOperand N1, SDOperand N2,
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if (TLI.getOperationAction(ISD::CTLZ, XType) == TargetLowering::Legal) {
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SDOperand Ctlz = getNode(ISD::CTLZ, XType, N1);
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return getNode(ISD::SRL, XType, Ctlz,
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getConstant(MVT::getSizeInBits(XType)-1,
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getConstant(Log2_32(MVT::getSizeInBits(XType)),
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TLI.getShiftAmountTy()));
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}
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}
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