Revert r131781 again. Apparently there is more going on here.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132625 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/BasicAliasAnalysis.cpp b/lib/Analysis/BasicAliasAnalysis.cpp
index 3d10a5f..24297d4 100644
--- a/lib/Analysis/BasicAliasAnalysis.cpp
+++ b/lib/Analysis/BasicAliasAnalysis.cpp
@@ -944,17 +944,7 @@
return NoAlias;
}
- // Statically, we can see that the base objects are the same, but the
- // pointers have dynamic offsets which we can't resolve. And none of our
- // little tricks above worked.
- //
- // TODO: Returning PartialAlias instead of MayAlias is a mild hack; the
- // practical effect of this is protecting TBAA in the case of dynamic
- // indices into arrays of unions. An alternative way to solve this would
- // be to have clang emit extra metadata for unions and/or union accesses.
- // A union-specific solution wouldn't handle the problem for malloc'd
- // memory however.
- return PartialAlias;
+ return MayAlias;
}
static AliasAnalysis::AliasResult
diff --git a/test/Analysis/BasicAA/2010-09-15-GEP-SignedArithmetic.ll b/test/Analysis/BasicAA/2010-09-15-GEP-SignedArithmetic.ll
index 7b5584e..2b0cd78 100644
--- a/test/Analysis/BasicAA/2010-09-15-GEP-SignedArithmetic.ll
+++ b/test/Analysis/BasicAA/2010-09-15-GEP-SignedArithmetic.ll
@@ -1,4 +1,4 @@
-; RUN: opt < %s -basicaa -aa-eval -print-all-alias-modref-info -disable-output |& grep {1 partial alias}
+; RUN: opt < %s -basicaa -aa-eval -print-all-alias-modref-info -disable-output |& grep {1 may alias}
; PR7959
target datalayout = "e-p:32:32:32"