Fix const merging when an alias of a const is llvm.used.

We used to disable constant merging not only if a constant is llvm.used, but
also if an alias of a constant is llvm.used. This change fixes that.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181175 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 13 insertions, 3 deletions

diff --git a/include/llvm/IR/Value.h b/include/llvm/IR/Value.h
index fb61a2ac70..5fba3d5714 100644
--- a/include/llvm/IR/Value.h
+++ b/include/llvm/IR/Value.h
@@ -260,14 +260,24 @@ public:
   /// this value.
   bool hasValueHandle() const { return HasValueHandle; }
 
-  /// stripPointerCasts - This method strips off any unneeded pointer casts and
-  /// all-zero GEPs from the specified value, returning the original uncasted
-  /// value. If this is called on a non-pointer value, it returns 'this'.
+  /// \brief This method strips off any unneeded pointer casts,
+  /// all-zero GEPs and aliases from the specified value, returning the original
+  /// uncasted value. If this is called on a non-pointer value, it returns
+  /// 'this'.
   Value *stripPointerCasts();
   const Value *stripPointerCasts() const {
     return const_cast<Value*>(this)->stripPointerCasts();
   }
 
+  /// \brief This method strips off any unneeded pointer casts and
+  /// all-zero GEPs from the specified value, returning the original
+  /// uncasted value. If this is called on a non-pointer value, it returns
+  /// 'this'.
+  Value *stripPointerCastsNoFollowAliases();
+  const Value *stripPointerCastsNoFollowAliases() const {
+    return const_cast<Value*>(this)->stripPointerCastsNoFollowAliases();
+  }
+
   /// stripInBoundsConstantOffsets - This method strips off unneeded pointer casts and
   /// all-constant GEPs from the specified value, returning the original
   /// pointer value. If this is called on a non-pointer value, it returns