From d0d1c8f830afbdbb708096be27d35101e13414a6 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Sun, 22 Feb 2004 19:37:31 +0000
Subject: [PATCH] Another bug fix for empty MBB's

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11716 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/RegAllocLocal.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/CodeGen/RegAllocLocal.cpp b/lib/CodeGen/RegAllocLocal.cpp
index 23063461d70..38e00733602 100644
--- a/lib/CodeGen/RegAllocLocal.cpp
+++ b/lib/CodeGen/RegAllocLocal.cpp
@@ -653,7 +653,7 @@ void RA::AllocateBasicBlock(MachineBasicBlock &MBB) {
   const TargetInstrInfo &TII = TM->getInstrInfo();
   MI = MBB.end();
   while (MI != MBB.begin() && TII.isTerminatorInstr((--MI)->getOpcode()));
-  ++MI;
+  if (MI != MBB.end()) ++MI;
 
   // Spill all physical registers holding virtual registers now.
   for (unsigned i = 0, e = RegInfo->getNumRegs(); i != e; ++i)