From: Pete Cooper <peter_cooper@apple.com>
Date: Thu, 10 Nov 2011 20:22:08 +0000 (+0000)
Subject: Fixed bug in DeadStoreElimination commit r144239
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=c7e5a6a2c69ee2552242da2a70775acd7d8819ae;p=oota-llvm.git

Fixed bug in DeadStoreElimination commit r144239

Size of data being pointed to wasn't always being checked so some small writes were killing big writes

Fixes <rdar://problem/10426753>


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144312 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Transforms/Scalar/DeadStoreElimination.cpp b/lib/Transforms/Scalar/DeadStoreElimination.cpp
index 03a557e0600..8f5f157a037 100644
--- a/lib/Transforms/Scalar/DeadStoreElimination.cpp
+++ b/lib/Transforms/Scalar/DeadStoreElimination.cpp
@@ -380,7 +380,7 @@ static OverwriteResult isOverwrite(const AliasAnalysis::Location &Later,
   if (isObjectPointerWithTrustworthySize(UO2)) {
     uint64_t ObjectSize =
       TD.getTypeAllocSize(cast<PointerType>(UO2->getType())->getElementType());
-    if (ObjectSize == Later.Size)
+    if (ObjectSize == Later.Size && ObjectSize >= Earlier.Size)
       return OverwriteComplete;
   }