[llvm] r294572 - LVI: Fix use-of-uninitialized-value after r294463

[Vitaly Buka via llvm-commits]

Author: vitalybuka
Date: Thu Feb  9 03:28:05 2017
New Revision: 294572

URL: http://llvm.org/viewvc/llvm-project?rev=294572&view=rev
Log:
LVI: Fix use-of-uninitialized-value after r294463

BlockValueStack can be reallocated making reference e invalid.

Modified:
    llvm/trunk/lib/Analysis/LazyValueInfo.cpp

Modified: llvm/trunk/lib/Analysis/LazyValueInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/LazyValueInfo.cpp?rev=294572&r1=294571&r2=294572&view=diff
==============================================================================
--- llvm/trunk/lib/Analysis/LazyValueInfo.cpp (original)
+++ llvm/trunk/lib/Analysis/LazyValueInfo.cpp Thu Feb  9 03:28:05 2017
@@ -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)) {