From: Chris Lattner <sabre@nondot.org>
Date: Tue, 4 Apr 2006 01:02:22 +0000 (+0000)
Subject: Constant fold bitconvert(undef)
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=08da55eeff8fdacd232e69c76bc5142eb4b1474e;p=oota-llvm.git

Constant fold bitconvert(undef)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27391 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 6eb6570467f..a2b575ff31d 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/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()) &&