From 813eedd2072edc2db3ca8c5306f7f269d372f45a Mon Sep 17 00:00:00 2001
From: Jakob Stoklund Olesen <stoklund@2pi.dk>
Date: Tue, 6 Jul 2010 21:06:39 +0000
Subject: [PATCH] Fix buildbot breakage where a def is missing.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107698 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/SimpleRegisterCoalescing.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/CodeGen/SimpleRegisterCoalescing.cpp b/lib/CodeGen/SimpleRegisterCoalescing.cpp
index 0a1885f329d..c450136001c 100644
--- a/lib/CodeGen/SimpleRegisterCoalescing.cpp
+++ b/lib/CodeGen/SimpleRegisterCoalescing.cpp
@@ -352,6 +352,8 @@ bool SimpleRegisterCoalescing::RemoveCopyByCommutingDef(const CoalescerPair &CP,
       AValNo->isUnused() || AValNo->hasPHIKill())
     return false;
   MachineInstr *DefMI = li_->getInstructionFromIndex(AValNo->def);
+  if (!DefMI)
+    return false;
   const TargetInstrDesc &TID = DefMI->getDesc();
   if (!TID.isCommutable())
     return false;
-- 
2.34.1