From 96430050a586a41da702506b5df0b7dd74f90ffe Mon Sep 17 00:00:00 2001
From: Bill Wendling <isanbard@gmail.com>
Date: Sat, 21 Feb 2009 01:07:26 +0000
Subject: [PATCH] Make sure we don't dereference the .end() of the container.

llvm-svn: 65211
---
 lib/Target/X86/X86RegisterInfo.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/Target/X86/X86RegisterInfo.cpp b/lib/Target/X86/X86RegisterInfo.cpp
index 82c15e7caf3..f4ada35e5fb 100644
--- a/lib/Target/X86/X86RegisterInfo.cpp
+++ b/lib/Target/X86/X86RegisterInfo.cpp
@@ -728,7 +728,8 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
   bool needsFrameMoves = (MMI && MMI->hasDebugInfo()) ||
                           !Fn->doesNotThrow() ||
                           UnwindTablesMandatory;
-  DebugLoc DL = MBBI->getDebugLoc();
+  DebugLoc DL = (MBBI != MBB.end()) ? MBBI->getDebugLoc() :
+    DebugLoc::getUnknownLoc();
 
   // Prepare for frame info.
   unsigned FrameLabelId = 0;