[Bug target/103069] cmpxchg isn't optimized

[thiago at kde dot org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103069

--- Comment #2 from Thiago Macieira <thiago at kde dot org> ---
See also bug 103090 for a few more (restricted) possibilities to replace a
cmpxchg loop with a LOCK RMW operation.