https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113618
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
It might be good to recognize this pattern in strlenopt or a related pass.
A purely local transform would turn it into
memcpy (temp, a, 64);
memmove (b, a, 64);
relying on DSE to eliminate the copy to temp if possible. Not sure if
that possibly would be a bad transform if copying to temp is required.
stp q30, q31, [sp]
ldp q30, q31, [sp]
why is CSE not able to catch this?
