http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55966
--- Comment #8 from Andi Kleen <andi-gcc at firstfloor dot org> 2013-01-14 22:32:06 UTC --- forbid = give warning and drop bit It's a hint, but in a good implementation it should not be silently dropped or code generated that has no chance to elide. It's a quality of implementation issue. IMHO there should be at least a warning for this case, like we do for other cases where elision doesn't work.
