commit a9e77d14c742603528ba6bc403da5a5566fb6c26
author Chris Lattner <sabre@nondot.org> Tue Apr 04 01:02:22 2006 +0000
committer Chris Lattner <sabre@nondot.org> Tue Apr 04 01:02:22 2006 +0000
tree 5746fb5a34e2c1fdd26cdf7406adbdd5e4f81338
parent b290906304b49d74e1186c1f863310dc2651e42d

Constant fold bitconvert(undef)

llvm-svn: 27391

llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 6eb6570..a2b575f 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -1167,6 +1167,8 @@
     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()) &&