[Bug rtl-optimization/62151] [5 Regression] wrong code at -O2 and -O3 on x86_64-linux-gnu

[amker at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62151

--- Comment #6 from amker at gcc dot gnu.org ---
(In reply to Richard Biener from comment #5)
> Note that probably also made a latent issue pop up.

Indeed.  After preliminary investigation, I think this case reveals two latent
issues.  The first one is a missed optimization opportunity on GIMPLE, while
the second one is a wrong code issue in RTL combine.

I will firstly look into the combine issue and send a report later.

Thanks,
bin