[llvm] r194929 - ScalarEvolution: Warn if the result of setFlags/clearFlags is unused.

[Benjamin Kramer]

Author: d0k
Date: Sat Nov 16 10:25:47 2013
New Revision: 194929

URL: http://llvm.org/viewvc/llvm-project?rev=194929&view=rev
Log:
ScalarEvolution: Warn if the result of setFlags/clearFlags is unused.

This was a source of bugs in the past.

Modified:
    llvm/trunk/include/llvm/Analysis/ScalarEvolution.h

Modified: llvm/trunk/include/llvm/Analysis/ScalarEvolution.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Analysis/ScalarEvolution.h?rev=194929&r1=194928&r2=194929&view=diff
==============================================================================
--- llvm/trunk/include/llvm/Analysis/ScalarEvolution.h (original)
+++ llvm/trunk/include/llvm/Analysis/ScalarEvolution.h Sat Nov 16 10:25:47 2013
@@ -189,15 +189,16 @@ namespace llvm {
 
     /// Convenient NoWrapFlags manipulation that hides enum casts and is
     /// visible in the ScalarEvolution name space.
-    static SCEV::NoWrapFlags maskFlags(SCEV::NoWrapFlags Flags, int Mask) {
+    static SCEV::NoWrapFlags LLVM_ATTRIBUTE_UNUSED_RESULT
+    maskFlags(SCEV::NoWrapFlags Flags, int Mask) {
       return (SCEV::NoWrapFlags)(Flags & Mask);
     }
-    static SCEV::NoWrapFlags setFlags(SCEV::NoWrapFlags Flags,
-                                      SCEV::NoWrapFlags OnFlags) {
+    static SCEV::NoWrapFlags LLVM_ATTRIBUTE_UNUSED_RESULT
+    setFlags(SCEV::NoWrapFlags Flags, SCEV::NoWrapFlags OnFlags) {
       return (SCEV::NoWrapFlags)(Flags | OnFlags);
     }
-    static SCEV::NoWrapFlags clearFlags(SCEV::NoWrapFlags Flags,
-                                        SCEV::NoWrapFlags OffFlags) {
+    static SCEV::NoWrapFlags LLVM_ATTRIBUTE_UNUSED_RESULT
+    clearFlags(SCEV::NoWrapFlags Flags, SCEV::NoWrapFlags OffFlags) {
       return (SCEV::NoWrapFlags)(Flags & ~OffFlags);
     }