[Bug target/120001] On RISC-V with -O2 and -O3 __sync_or_and_fetch in a loop renders as an endless loop and multiple amoor

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120001

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Vincenzo Romano from comment #4)
> Id the double amoor op intentional?
> 
> If so, why?

I said why:
Unrolling the infinite loop is what happens.

We copy the inner basic block of the loop to "unroll" it during bb reordering.
It happens on many targets but it is due to the infinite loop.