From daf9bc8eee3eb1bc992480921f50ef1b760f4159 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Mon, 19 Nov 2007 20:21:32 +0000
Subject: [PATCH] Implement splitting of UNDEF nodes. This is the first step
 towards fixing PR1811

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44239 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/SelectionDAG/LegalizeDAG.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index c6b4662b2b4..e343a0e5de5 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -6265,6 +6265,10 @@ void SelectionDAGLegalize::SplitVectorOp(SDOperand Op, SDOperand &Lo,
     Node->dump(&DAG);
 #endif
     assert(0 && "Unhandled operation in SplitVectorOp!");
+  case ISD::UNDEF:
+    Lo = DAG.getNode(ISD::UNDEF, NewVT_Lo);
+    Hi = DAG.getNode(ISD::UNDEF, NewVT_Hi);
+    break;
   case ISD::BUILD_PAIR:
     Lo = Node->getOperand(0);
     Hi = Node->getOperand(1);
-- 
2.34.1