From 5cfff2545d5c731bb236d6e5c355bcb59d7abda7 Mon Sep 17 00:00:00 2001
From: John Criswell <criswell@uiuc.edu>
Date: Mon, 4 Aug 2003 18:24:31 +0000
Subject: [PATCH] Added code that ensures that we don't try to reduce an empty
 vector of basic blocks. This fixes the bugpoint regressions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7569 91177308-0d34-0410-b5e6-96231b3b80d8
---
 tools/bugpoint/CrashDebugger.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/bugpoint/CrashDebugger.cpp b/tools/bugpoint/CrashDebugger.cpp
index 40854aa380d..852359a8c24 100644
--- a/tools/bugpoint/CrashDebugger.cpp
+++ b/tools/bugpoint/CrashDebugger.cpp
@@ -142,7 +142,7 @@ public:
     
   virtual TestResult doTest(std::vector<BasicBlock*> &Prefix,
                             std::vector<BasicBlock*> &Kept) {
-    if (TestBlocks(Kept))
+    if (!Kept.empty() && TestBlocks(Kept))
       return KeepSuffix;
     if (!Prefix.empty() && TestBlocks(Prefix))
       return KeepPrefix;
-- 
2.34.1