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Fold shifts with undef operands.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28167 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1439,11 +1439,14 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
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case ISD::FSUB:
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case ISD::FDIV:
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case ISD::FREM:
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case ISD::SRA:
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return N1; // fold op(undef, arg2) -> undef
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case ISD::UDIV:
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case ISD::SDIV:
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case ISD::UREM:
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case ISD::SREM:
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case ISD::SRL:
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case ISD::SHL:
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return getConstant(0, VT); // fold op(undef, arg2) -> 0
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}
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}
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@ -1467,9 +1470,13 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
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return N2; // fold op(arg1, undef) -> undef
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case ISD::MUL:
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case ISD::AND:
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case ISD::SRL:
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case ISD::SHL:
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return getConstant(0, VT); // fold op(arg1, undef) -> 0
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case ISD::OR:
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return getConstant(MVT::getIntVTBitMask(VT), VT);
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case ISD::SRA:
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return N1;
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}
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}
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