commit 3d7c780d93ebcb84a1224de8c44835ea43e82b15
author Eli Friedman <eli.friedman@gmail.com> Fri Oct 26 23:23:35 2012 +0000
committer Eli Friedman <eli.friedman@gmail.com> Fri Oct 26 23:23:35 2012 +0000
tree e09f0b41899de083f34367ff644c4f0dbf279bc3
parent 8c7a185dd84a7d44b1c83f66fd60629372efd498

Add missing safety check to an optimization for do-while loops.  PR14191.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@166832 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/CGStmt.cpp

diff --git a/lib/CodeGen/CGStmt.cpp b/lib/CodeGen/CGStmt.cpp
index 7c65b3c..5c1fea4 100644
--- a/lib/CodeGen/CGStmt.cpp
+++ b/lib/CodeGen/CGStmt.cpp
@@ -237,6 +237,10 @@
   if (!BI || !BI->isUnconditional())
     return;
 
+  // Can only simplify empty blocks.
+  if (BI != BB->begin())
+    return;
+
   BB->replaceAllUsesWith(BI->getSuccessor(0));
   BI->eraseFromParent();
   BB->eraseFromParent();