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From: Ira Rosen <IRAR@il.ibm.com>
To: "Daniel Berlin" <dberlin@dberlin.org>
Cc: Dorit Nuzman <DORIT@il.ibm.com>,
	        "Vladimir N. Makarov" <vmakarov@redhat.com>,
	        "Eric Botcazou" <ebotcazou@libertysurf.fr>,
	gcc@gcc.gnu.org,         "H. J. Lu" <hjl@lucon.org>,
	"Ian Lance Taylor" <iant@google.com>
Subject: Re: Some thoughts about steerring commitee work
Date: Sun, 17 Jun 2007 13:59:00 -0000	[thread overview]
Message-ID: <OFA9589FAD.90AE862E-ONC22572FD.003FD949-C22572FD.0042F4EE@il.ibm.com> (raw)


"Daniel Berlin" <dberlin@dberlin.org> wrote on 16/06/2007:

> On 6/16/07, Dorit Nuzman <DORIT@il.ibm.com> wrote:
>
> > Do you have specific examples where SLP helps performance out of loops?
>
> hash calculations.
>
> For md5, you can get a 2x performance improvement by straight-line
> vectorizing it
> sha1 is about 2-2.5x
>
> (This assumes you do good pack/unpack placement using something like
> lazy code motion)
>
> See, for example, http://arctic.org/~dean/crypto/sha1.html
>
> (The page is out of date, the technique they explain where they are
> doing straight line computation of the hash in parallel, is exactly
> what SLP would provide out of loops)

I looked at the above page (and also at MD5 and SHA1 implementations). I
found only computations inside loops.
Could you please explain what exactly you refer to as SLP out of loops in
this benchmark?

Thanks,
Ira

             reply	other threads:[~2007-06-17 12:11 UTC|newest]

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-06-17 13:59 Ira Rosen [this message]
2007-06-17 16:11 ` Daniel Berlin
2007-06-18 10:59   ` Dorit Nuzman
2007-06-18 12:01     ` Daniel Berlin
2007-06-18 12:53       ` Dorit Nuzman
2007-06-18 17:57         ` Sebastian Pop
2007-06-18 18:10           ` Daniel Berlin
2007-06-18 20:54     ` Jagasia, Harsha
  -- strict thread matches above, loose matches on Subject: below --
2007-06-25 13:07 Mircea Namolaru
2007-06-18 17:16 Devang Patel
2007-06-16  2:03 J.C. Pizarro
2007-06-16  2:43 ` Ian Lance Taylor
2007-06-16  3:32 ` Richard Kenner
2007-06-16 19:08 ` Joe Buck
2007-06-14 10:37 Diego Novillo appointed middle-end maintainer and non-algorithmic GWP David Edelsohn
2007-06-15 12:49 ` Some thoughts about steerring commitee work Vladimir N. Makarov
2007-06-15 13:05   ` Richard Kenner
2007-06-15 13:58     ` Vladimir N. Makarov
2007-06-15 17:07   ` Joe Buck
2007-06-15 17:48     ` Vladimir N. Makarov
2007-06-15 17:56       ` Joe Buck
2007-09-09 20:24       ` Gerald Pfeifer
2007-06-15 18:43   ` Ian Lance Taylor
2007-06-15 19:28     ` Vladimir N. Makarov
2007-06-15 19:41       ` Ian Lance Taylor
2007-06-15 20:55         ` Vladimir N. Makarov
2007-06-15 21:08           ` Eric Botcazou
2007-06-15 21:13             ` Daniel Berlin
2007-06-15 21:43               ` Eric Botcazou
2007-06-15 22:16                 ` Vladimir N. Makarov
2007-06-15 23:04               ` Richard Kenner
2007-06-15 21:36             ` Vladimir N. Makarov
2007-06-16  0:51               ` Tobias Burnus
2007-06-17 14:33               ` Paolo Bonzini
2007-06-16  1:43             ` Ian Lance Taylor
2007-06-16  2:02               ` H. J. Lu
2007-06-16  2:19                 ` Andrew Pinski
2007-06-16 13:25                   ` H. J. Lu
2007-06-16  3:33                 ` Vladimir N. Makarov
2007-06-16 15:04                   ` H. J. Lu
2007-06-16 16:13                     ` Dorit Nuzman
2007-06-17  0:48                       ` H. J. Lu
2007-06-17  1:16                         ` Tim Prince
2007-06-17  8:30                           ` Dorit Nuzman
2007-06-16 15:53                   ` Dorit Nuzman
2007-06-16 16:46                     ` Daniel Berlin
2007-06-16 15:29                 ` Dorit Nuzman
2007-06-16 23:59                 ` Ryan Hill
2007-06-17 10:44                   ` Dorit Nuzman
2007-06-17 14:52                     ` Ryan Hill
2007-06-18 10:47                       ` Dorit Nuzman
2007-06-16  3:08               ` Vladimir N. Makarov
2007-06-16  3:36                 ` Richard Kenner
2007-06-16  1:54           ` Ian Lance Taylor
2007-06-16  3:28             ` Vladimir N. Makarov
2007-06-16  3:45               ` Richard Kenner
2007-06-16 15:20                 ` Joel Sherrill
2007-06-18 23:12                   ` Mark Mitchell
2007-06-19 21:01                     ` Toon Moene

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