[Bug middle-end/92455] Unnecessary memory read in a loop

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92455

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Antony Polukhin from comment #2)
> Can the -ftree-partial-pre flag be enabled by default for -O2?

It used to be quite slow in its dataflow compute but that has improved.
It's still quadratic in size though and it's scope is extremely limited
(partial antic but fully available).  So I don't think so.  But maybe
you can provide benchmark data (including compile-time/memory-use figures)?