1 files changed, 11 insertions, 0 deletions
diff --git a/lib/Analysis/BasicAliasAnalysis.cpp b/lib/Analysis/BasicAliasAnalysis.cpp
index bf92969..4e423a7 100644
--- a/lib/Analysis/BasicAliasAnalysis.cpp
+++ b/lib/Analysis/BasicAliasAnalysis.cpp
@@ -1238,6 +1238,17 @@ BasicAliasAnalysis::aliasCheck(const Value *V1, uint64_t V1Size,
       return NoAlias;
     if (isEscapeSource(O2) && isNonEscapingLocalObject(O1))
       return NoAlias;
+
+    // If one object is a global variable without address taken, the other one
+    // is a different object, they will not alias because the global variable
+    // in question cannot be indirectly accessed.
+    if (const GlobalVariable *GV = dyn_cast<GlobalVariable>(O1))
+      if (!GV->AddressMaybeTaken())
+        return NoAlias;
+
+    if (const GlobalVariable *GV = dyn_cast<GlobalVariable>(O2))
+      if (!GV->AddressMaybeTaken())
+        return NoAlias;
   }
 
   // If the size of one access is larger than the entire object on the other