https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102404
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target|x86_64 |x86_64-*-*
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
Last reconfirmed| |2021-09-20
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
32 bytes are 256 bits (ymm), 64 bytes are 512 bits (zmm). GCC does not
consider zmm vectorization because
t.c:25:37: missed: loop does not have enough iterations to support
vectorization.
because
t.c:25:37: note: vectorization_factor = 16, niters = 8
the memory accesses cannot be related so we fail to SLP this.
Does clang use vpgathers/scatters on %zmm here?
