From ff197dfcf9ac50a62d21e0c30644e09ca3bb92f5 Mon Sep 17 00:00:00 2001
From: Andrew Trick <atrick@apple.com>
Date: Fri, 21 Jun 2013 18:33:11 +0000
Subject: Fix a -join-globalcopies bug; handle undef operands.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184569 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/RegisterCoalescer.cpp | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'lib')

diff --git a/lib/CodeGen/RegisterCoalescer.cpp b/lib/CodeGen/RegisterCoalescer.cpp
index 6e7d90dd65..70a2462880 100644
--- a/lib/CodeGen/RegisterCoalescer.cpp
+++ b/lib/CodeGen/RegisterCoalescer.cpp
@@ -2072,6 +2072,9 @@ static bool isLocalCopy(MachineInstr *Copy, const LiveIntervals *LIS) {
   if (!Copy->isCopy())
     return false;
 
+  if (Copy->getOperand(1).isUndef())
+    return false;
+
   unsigned SrcReg = Copy->getOperand(1).getReg();
   unsigned DstReg = Copy->getOperand(0).getReg();
   if (TargetRegisterInfo::isPhysicalRegister(SrcReg)
-- 
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