From: Dan Gohman <gohman@apple.com>
Date: Mon, 13 Dec 2010 22:47:57 +0000 (+0000)
Subject: Update memdep to handle PartialAlias as MayAlias.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=2cd195291722ad0153125a6c032c96e361d8c48e;p=oota-llvm.git

Update memdep to handle PartialAlias as MayAlias.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121723 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Analysis/MemoryDependenceAnalysis.cpp b/lib/Analysis/MemoryDependenceAnalysis.cpp
index c833184b6fd..1cd7dec1988 100644
--- a/lib/Analysis/MemoryDependenceAnalysis.cpp
+++ b/lib/Analysis/MemoryDependenceAnalysis.cpp
@@ -291,7 +291,7 @@ getPointerDependencyFrom(const AliasAnalysis::Location &MemLoc, bool isLoad,
         continue;
       
       // May-alias loads don't depend on each other without a dependence.
-      if (isLoad && R == AliasAnalysis::MayAlias)
+      if (isLoad && R != AliasAnalysis::MustAlias)
         continue;
 
       // Stores don't alias loads from read-only memory.
@@ -323,9 +323,9 @@ getPointerDependencyFrom(const AliasAnalysis::Location &MemLoc, bool isLoad,
       
       if (R == AliasAnalysis::NoAlias)
         continue;
-      if (R == AliasAnalysis::MayAlias)
-        return MemDepResult::getClobber(Inst);
-      return MemDepResult::getDef(Inst);
+      if (R == AliasAnalysis::MustAlias)
+        return MemDepResult::getDef(Inst);
+      return MemDepResult::getClobber(Inst);
     }
 
     // If this is an allocation, and if we know that the accessed pointer is to