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Constant fold bitconvert(undef)

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27391 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2006-04-04 01:02:22 +00:00
parent e6bfffbae2
commit 08da55eeff
1 changed files with 2 additions and 0 deletions
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lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@ -1167,6 +1167,8 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
if (VT == Operand.getValueType()) return Operand; // noop conversion. if (VT == Operand.getValueType()) return Operand; // noop conversion.
if (OpOpcode == ISD::BIT_CONVERT) // bitconv(bitconv(x)) -> bitconv(x) if (OpOpcode == ISD::BIT_CONVERT) // bitconv(bitconv(x)) -> bitconv(x)
return getNode(ISD::BIT_CONVERT, VT, Operand.getOperand(0)); return getNode(ISD::BIT_CONVERT, VT, Operand.getOperand(0));
if (OpOpcode == ISD::UNDEF)
return getNode(ISD::UNDEF, VT);
break; break;
case ISD::SCALAR_TO_VECTOR: case ISD::SCALAR_TO_VECTOR:
assert(MVT::isVector(VT) && !MVT::isVector(Operand.getValueType()) && assert(MVT::isVector(VT) && !MVT::isVector(Operand.getValueType()) &&