Thanks for a quick response!

On Tue, Apr 7, 2015 at 5:34 PM, Rich Felker <dalias@libc.org> wrote:

> I'm
> guessing you need -O0 to trigger it, no?


I'm experience problem with optimization for size (-Os).
It's look like behaviour was changed in later GCC (at least from 4.8.3).
I will test another optimization levels.


> > i wonder if __stat_fix could be inlined in a way that the
> > compiler knows it shouldnt clobber r2.
>
> In practice it always is, at least for me. But relying on that for
> semantic purposes is not valid.
>

I read that in linux kernel are used attribute "always_inline" for critical
parts.