https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80636
Peter Cordes <peter at cordes dot ca> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Peter Cordes <peter at cordes dot ca> ---
This seems to be fixed for ZMM vectors in GCC8.
https://gcc.godbolt.org/z/7351be1v4
Seems to have never been a problem for __m256, at least not for
__m256 zero256(){ return _mm256_setzero_ps(); }
IDK what I was looking at when I originally reported; maybe just clang which
*did* used to prefer YMM-zeroing.
Some later comments suggested movdqa vs. pxor zeroing choices (and mov vs. xor
for integer), but the bug title is just AVX / AVX-512 xor-zeroing, and that
seems to be fixed. So I think this should be closed.
