https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86073
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-06-07
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Probably arm misses the setup to handle this via can_store_by_pieces or
set_storage_via_setmem. What arm subarchitecture are you creating code for?
On x86 with -m32 the 'size' loop isn't recognized as memset at the GIMPLE
level (it isn't a memset after all) and we expand the 'pro' loop as memset
call but not the 'rem' loop.
Note that pro seems to be MAX(size, <st> & 3) so it isn't really <= 3.
Thus, x86 is working fine but arm isn't.
