https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82498
--- Comment #6 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Jack Lloyd from comment #5)
> Jakub thank you very much for your comments, this was helpful for me in
> getting consistent rol/ror generation.
>
> Speaking as a user it's frustrating that Clang and GCC don't just have a
> builtin for rotations like MSVC does, instead you have to guess what
> expressions the optimizer(s) know about. That said there are a lot of
> strange ways to right a rotate and probably GCC doesn't need to know all of
> them.
You can use __rol{b,w,d,q} and __ror{b,w,d,q} (and their aliases) from
ia32intrin.h. These are standardized; you have to include x86intrin.h header.
