[Bug rtl-optimization/82524] [7/8 Regression] expensive-optimizations produces wrong results

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82524

--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #11)
> Created attachment 42346 [details]
> gcc8-pr82524.patch

Actually, that doesn't work, we ICE on the match_dups.  rtx_equal_p in the
conditions works though and could be easily reverted (but the =Q to +Q kept) if
LRA is taught to do this (if possible).