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From: "jbeulich at suse dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/94343] [10 Regression] invalid AVX512VL vpternlogd
 instruction emitted for -march=knl
Date: Fri, 27 Mar 2020 07:00:34 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94343

--- Comment #11 from jbeulich at suse dot com ---
(In reply to Jakub Jelinek from comment #7)
> Though, there are other issues.  There is only vpternlog{d,q}, so for
> V*[QH]Imode we shouldn't pretend we have masking support.

Why would this be? The element mode doesn't matter at all for bitwise
operations. Just like there's no VPANDB / VPANDW, but VPANDD/VPANDQ are qui=
te
fine to use on vectors of QI or HI. Afaict the existence of VPAND{D,Q} in
AVX512 (as opposed to {,V}PAND in MMX/SSE2/AVX) is merely an oddity resulti=
ng
from EVEX.W handling (besides of course the element width's effect on embed=
ded
broadcasting).=