[Bug rtl-optimization/63259] Detecting byteswap sequence

[olegendo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63259

--- Comment #20 from Oleg Endo <olegendo at gcc dot gnu.org> ---
BTW, PR 42587 contains a few other cases.  I've created PR 64376 for the SH
specific parts.