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.