[Bug c++/54130] Recognize builtins with bool return type

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54130

--- Comment #10 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-08-01 09:26:53 UTC ---
(In reply to comment #9)
> I realize that several (not all) of the things discussed here assume that
> functions returning bool and int are binary compatible, which is likely true on
> most platforms but there might be exceptions.

It's not true on x86_64 - return values are not extended to word_mode thus
you may have garbage in the upper parts of %eax for bool.