https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108637
Li Shaohua <shaohua.li at inf dot ethz.ch> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|INVALID |---
Status|RESOLVED |UNCONFIRMED
--- Comment #3 from Li Shaohua <shaohua.li at inf dot ethz.ch> ---
(In reply to Li Shaohua from comment #2)
> (In reply to Andrew Pinski from comment #1)
> > PRE removes the load/stores from/to *f .
> > Basically the compiler is able to remove the use-after-scope usage with -O2
> > and above.
>
> Well, this makes sense to me while in this case only -O2 not other opt
> levels did not report this use-after-scope usage.
I looked into this again and found that for GCC-12, it was indeed the case. But
for the trunk, I indeed observed that PRE did not optimize away load/store.
Compiler explorer: https://godbolt.org/z/sb658P1cM
