[Bug rtl-optimization/122992] speed up loops with TEST_HARD_REG_BIT using EXECUTE_IF_SET_IN_HARD_REG_SET

[kevinstefanov15 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122992

--- Comment #34 from Kevin Stefanov <kevinstefanov15 at gmail dot com> ---
(In reply to Xi Ruoyao from comment #33)
> One last comment: sometimes "easyhack" can be more difficult than we think. 
> I remember I spent some time on PR62181 when I begun to work on GCC but my
> attempt miserably failed and the PR is still open today (after I made
> hundreds of GCC commits).

Yes, I can see how that's a thing for a project like GCC. I learnt something
from it to carry into my future contributions, so that's good.