From 38a723830cee87aac2141e5c8435fce4d81406af Mon Sep 17 00:00:00 2001
From: Dan Gohman <dan433584@gmail.com>
Date: Wed, 27 Mar 2013 18:44:56 +0000
Subject: [PATCH] Avoid undefined behavior from passing a std::vector's own
 contents in as an argument to push_back.

llvm-svn: 178166
---
 llvm/utils/TableGen/CodeGenSchedule.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/llvm/utils/TableGen/CodeGenSchedule.cpp b/llvm/utils/TableGen/CodeGenSchedule.cpp
index 818fce2048c5..886c4c639448 100644
--- a/llvm/utils/TableGen/CodeGenSchedule.cpp
+++ b/llvm/utils/TableGen/CodeGenSchedule.cpp
@@ -1105,7 +1105,9 @@ void PredTransitions::getIntersectingVariants(
       // Push another copy of the current transition for more variants.
       Variant.TransVecIdx = TransVec.size();
       IntersectingVariants.push_back(Variant);
-      TransVec.push_back(TransVec[TransIdx]);
+
+      PredTransition Trans = TransVec[TransIdx];
+      TransVec.push_back(Trans);
     }
   }
 }