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From: "ktietz at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/59429] Missed optimization opportunity in qsort-style comparison functions
Date: Fri, 02 May 2014 16:42:00 -0000	[thread overview]
Message-ID: <bug-59429-4-SiQTK0NjNk@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-59429-4@http.gcc.gnu.org/bugzilla/>

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59429

--- Comment #11 from Kai Tietz <ktietz at gcc dot gnu.org> ---
sure,  I just shown the transformation for doing the sorting.  After
prioritizing the order we should transform back to initial condition and just
changing comparison code plus the edges.

To handle this we could use a table describing transformation rules.  So we
don't need to calculate anything.
We have here one special-case to handle:

'(a cmp1 b ? x : (a eq-neq b))' as this would be in the long form '(a cmp1 b ?
(a eq-neq b ? 1 : 0))'


  parent reply	other threads:[~2014-05-02 16:42 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-12-09 11:35 [Bug rtl-optimization/59429] New: " jengelh at inai dot de
2013-12-09 13:16 ` [Bug rtl-optimization/59429] " hjl.tools at gmail dot com
2013-12-09 14:02 ` jengelh at inai dot de
2013-12-09 14:05 ` jengelh at inai dot de
2014-04-04 11:37 ` ktietz at gcc dot gnu.org
2014-05-02 15:58 ` law at redhat dot com
2014-05-02 15:59 ` law at redhat dot com
2014-05-02 16:03 ` ktietz at gcc dot gnu.org
2014-05-02 16:09 ` law at redhat dot com
2014-05-02 16:14 ` ktietz at gcc dot gnu.org
2014-05-02 16:33 ` law at redhat dot com
2014-05-02 16:42 ` ktietz at gcc dot gnu.org [this message]
2014-05-05  8:48 ` rguenth at gcc dot gnu.org
2014-05-30  8:33 ` ktietz at gcc dot gnu.org
2021-07-25  0:22 ` [Bug tree-optimization/59429] " pinskia at gcc dot gnu.org
2024-01-24 16:56 ` pinskia at gcc dot gnu.org
2024-03-22 10:55 ` redbeard0531 at gmail dot com

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