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From: "marc.glisse at normalesup dot org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug target/52572] suboptimal assignment to avx element Date: Tue, 13 Mar 2012 08:17:00 -0000 [thread overview] Message-ID: <bug-52572-4-zdwMywnqBC@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-52572-4@http.gcc.gnu.org/bugzilla/> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52572 --- Comment #2 from Marc Glisse <marc.glisse at normalesup dot org> 2012-03-13 08:16:58 UTC --- (In reply to comment #1) > Have you actually tried that? Ah, no, sorry, I only have occasional access to such a machine to benchmark the code. From a -Os perspective it is still shorter (but indeed that matters less to me than -O3 performance). > Mixing VEX encoded insns with legacy encoded > SSE* insns is very costly, for good performance there needs to be a vzeroupper > in between (but then you lose the upper bits). See e.g. 2.8 in the AVX > Programming Reference. Thanks, I'd missed that. The vblendpd solution should still apply (from the initial 'v' it sounds safe), no?
next prev parent reply other threads:[~2012-03-13 8:17 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-03-12 22:50 [Bug target/52572] New: " marc.glisse at normalesup dot org 2012-03-13 7:55 ` [Bug target/52572] " jakub at gcc dot gnu.org 2012-03-13 8:17 ` marc.glisse at normalesup dot org [this message] 2012-03-13 17:58 ` marc.glisse at normalesup dot org 2021-12-25 22:30 ` pinskia at gcc dot gnu.org
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