From 056063e2645d86b11a441abfff4bfd96dc4edf8c Mon Sep 17 00:00:00 2001
From: Alkis Evlogimenos <alkis@evlogimenos.com>
Date: Mon, 22 Dec 2003 13:54:29 +0000
Subject: Fix crash when compiling twolf.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10584 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/LiveIntervalAnalysis.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'lib/CodeGen/LiveIntervalAnalysis.cpp')

diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp
index 05b4f5a124..e4b134bc9d 100644
--- a/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -146,7 +146,8 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock* mbb,
         unsigned liveBlockIndex = it->first;
         MachineBasicBlock* liveBlock = it->second;
         if (liveBlockIndex < vi.AliveBlocks.size() &&
-            vi.AliveBlocks[liveBlockIndex]) {
+            vi.AliveBlocks[liveBlockIndex] &&
+            !liveBlock->empty()) {
             unsigned start =  getInstructionIndex(liveBlock->front());
             unsigned end = getInstructionIndex(liveBlock->back()) + 1;
             interval->addRange(start, end);
-- 
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