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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	[thread overview]
Message-ID: <bug-94343-4-lw3dGKK0jD@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-94343-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94343

--- 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 such
an upcast be carried out by emitting an insn to zero the upper portion, rather
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 using
a mode iterator different from VI (VI48_AVX512VL if you really mean to exclude
vectors of QI/HI, or a combination of this and VI12_AVX512VL otherwise).

  parent reply	other threads:[~2020-03-27  7:31 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-26 15:24 [Bug target/94343] New: " kretz at kde dot org
2020-03-26 15:39 ` [Bug target/94343] " marxin at gcc dot gnu.org
2020-03-26 15:58 ` jakub at gcc dot gnu.org
2020-03-26 16:34 ` hjl.tools at gmail dot com
2020-03-26 16:41 ` jakub at gcc dot gnu.org
2020-03-26 17:08 ` jakub at gcc dot gnu.org
2020-03-26 17:14 ` hjl.tools at gmail dot com
2020-03-26 17:52 ` jakub at gcc dot gnu.org
2020-03-26 17:59 ` jakub at gcc dot gnu.org
2020-03-26 19:30 ` kretz at kde dot org
2020-03-26 19:44 ` jakub at gcc dot gnu.org
2020-03-27  7:00 ` jbeulich at suse dot com
2020-03-27  7:07 ` jbeulich at suse dot com
2020-03-27  7:31 ` jbeulich at suse dot com [this message]
2020-03-27  8:45 ` jakub at gcc dot gnu.org
2020-03-27  9:11 ` jakub at gcc dot gnu.org
2020-03-27  9:17 ` jbeulich at suse dot com
2020-03-27  9:21 ` jakub at gcc dot gnu.org
2020-03-30 16:05 ` cvs-commit at gcc dot gnu.org
2020-03-30 16:06 ` jakub at gcc dot gnu.org

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