[Bug middle-end/102566] [i386] GCC should emit LOCK BTS for simple bit-test-and-set operations with std::atomic

[thiago at kde dot org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102566

--- Comment #19 from Thiago Macieira <thiago at kde dot org> ---
(In reply to H.J. Lu from comment #17)
> Created attachment 51558 [details]
> The v6 patch
> 
> Please try this.

Confirmed for all inputs.