From 9987d983704cb3086b0275043a07c1f599d9eaad Mon Sep 17 00:00:00 2001
From: Vitaly Buka <vitalybuka@google.com>
Date: Thu, 9 Feb 2017 09:28:05 +0000
Subject: LVI: Fix use-of-uninitialized-value after r294463

BlockValueStack can be reallocated making reference e invalid.

llvm-svn: 294572
---
 llvm/lib/Analysis/LazyValueInfo.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'llvm/lib/Analysis/LazyValueInfo.cpp')

diff --git a/llvm/lib/Analysis/LazyValueInfo.cpp b/llvm/lib/Analysis/LazyValueInfo.cpp
index e8f2d536c19..877fc055358 100644
--- a/llvm/lib/Analysis/LazyValueInfo.cpp
+++ b/llvm/lib/Analysis/LazyValueInfo.cpp
@@ -677,7 +677,7 @@ void LazyValueInfoImpl::solve() {
       BlockValueStack.clear();
       return;
     }
-    std::pair<BasicBlock *, Value *> &e = BlockValueStack.back();
+    std::pair<BasicBlock *, Value *> e = BlockValueStack.back();
     assert(BlockValueSet.count(e) && "Stack value should be in BlockValueSet!");
 
     if (solveBlockValue(e.second, e.first)) {
-- 
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