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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 07:31:59 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94343

--- Comment #13 from jbeulich at suse dot com ---
As to using 512-bit operations even on more narrow input types - is this
correct when e.g. subsequently source code upcasts the vector? I.e. would s=
uch
an upcast be carried out by emitting an insn to zero the upper portion, rat=
her
than simply considering this a re-interpretation of the same register (with=
 no
insn emitted at all)? In which case the fix would apparently boil down to u=
sing
a mode iterator different from VI (VI48_AVX512VL if you really mean to excl=
ude
vectors of QI/HI, or a combination of this and VI12_AVX512VL otherwise).=