Constant fold bitconvert(undef)

llvm-svn: 27391
2006-04-04 01:02:22 +00:00 · 2006-04-04 01:02:22 +00:00 · a9e77d14c7
parent b290906304
commit a9e77d14c7
1 changed files with 2 additions and 0 deletions
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@ -1167,6 +1167,8 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
    if (VT == Operand.getValueType()) return Operand;  // noop conversion.
    if (OpOpcode == ISD::BIT_CONVERT)  // bitconv(bitconv(x)) -> bitconv(x)
      return getNode(ISD::BIT_CONVERT, VT, Operand.getOperand(0));
+    if (OpOpcode == ISD::UNDEF)
+      return getNode(ISD::UNDEF, VT);
    break;
  case ISD::SCALAR_TO_VECTOR:
    assert(MVT::isVector(VT) && !MVT::isVector(Operand.getValueType()) &&