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Constant fold bitconvert(undef)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27391 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1167,6 +1167,8 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
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if (VT == Operand.getValueType()) return Operand; // noop conversion.
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if (OpOpcode == ISD::BIT_CONVERT) // bitconv(bitconv(x)) -> bitconv(x)
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return getNode(ISD::BIT_CONVERT, VT, Operand.getOperand(0));
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if (OpOpcode == ISD::UNDEF)
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return getNode(ISD::UNDEF, VT);
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break;
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case ISD::SCALAR_TO_VECTOR:
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assert(MVT::isVector(VT) && !MVT::isVector(Operand.getValueType()) &&
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