From bcf3409107821371b4bdfc072a8ca0583e566f56 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.

llvm-svn: 107698
---
 llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp b/llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp
index 0a1885f329d8..c450136001c4 100644
--- a/llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp
+++ b/llvm/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;