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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/47298] -O3 destroys beautifully vectorized code obtained at -O2 Date: Fri, 29 Jun 2012 15:01:00 -0000 [thread overview] Message-ID: <bug-47298-4-wJnZzwV7LV@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-47298-4@http.gcc.gnu.org/bugzilla/> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47298 Richard Guenther <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Ever Confirmed|0 |1 --- Comment #5 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-06-29 15:01:28 UTC --- The issue is we completely unroll the innermost loop at -O3 -funroll-loops. We then vectorize the outer loop but have to peel for alignment (and are not good at seeing we run at most once there).
next prev parent reply other threads:[~2012-06-29 15:01 UTC|newest] Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top 2011-01-14 20:53 [Bug middle-end/47298] New: " Joost.VandeVondele at pci dot uzh.ch 2011-01-14 21:02 ` [Bug middle-end/47298] " rguenth at gcc dot gnu.org 2011-01-14 21:11 ` Joost.VandeVondele at pci dot uzh.ch 2011-01-14 21:27 ` Joost.VandeVondele at pci dot uzh.ch 2012-06-29 14:44 ` Joost.VandeVondele at mat dot ethz.ch 2012-06-29 15:01 ` rguenth at gcc dot gnu.org [this message] 2012-07-05 7:36 ` ebotcazou at gcc dot gnu.org 2012-07-05 8:38 ` rguenth at gcc dot gnu.org 2012-07-05 8:48 ` ebotcazou at gcc dot gnu.org 2012-07-05 10:10 ` rguenth at gcc dot gnu.org 2012-07-05 10:12 ` rguenth at gcc dot gnu.org 2012-07-05 10:30 ` ebotcazou at gcc dot gnu.org 2013-03-27 13:02 ` rguenth at gcc dot gnu.org
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