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Trivial patch to speed up legalizing common i64 constants.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31020 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1234,6 +1234,13 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
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if (N2C && N2C->getValue() == 0)
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return N2;
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break;
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case ISD::OR:
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case ISD::XOR:
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// (X ^| 0) -> X. This commonly occurs when legalizing i64 values, so it's
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// worth handling here.
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if (N2C && N2C->getValue() == 0)
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return N1;
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break;
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case ISD::FP_ROUND_INREG:
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if (cast<VTSDNode>(N2)->getVT() == VT) return N1; // Not actually rounding.
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break;
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