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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/49959] ABS pattern is not recognized
Date: Sat, 21 Jan 2012 08:21:00 -0000	[thread overview]
Message-ID: <bug-49959-4-a9E6xu15Ju@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-49959-4@http.gcc.gnu.org/bugzilla/>

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49959

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-01-21 08:03:40 UTC ---
If we had a pass which was able to convert:
<bb 3>:
  iftmp.0_6 = (long unsigned int) D.1708_4;
  goto <bb 5>;

<bb 4>:
  D.1712_8 = -D.1708_4;
  iftmp.0_9 = (long unsigned int) D.1712_8;

<bb 5>:
  # iftmp.0_1 = PHI <iftmp.0_6(3), iftmp.0_9(4)>

Into:

<bb 3>:
  goto <bb 5>;

<bb 4>:
  D.1712_8 = -D.1708_4;

<bb 5>:
  # t_N = PHI<D.1708_4(3), D.1712_8(4)>
  iftmp.0_1 = (long unsigned int)t_n;

And then PHIOPT would recognize it.  So this is really the code commoning.


  parent reply	other threads:[~2012-01-21  8:05 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-08-03 12:25 [Bug middle-end/49959] New: " enkovich.gnu at gmail dot com
2011-08-03 12:50 ` [Bug tree-optimization/49959] " rguenth at gcc dot gnu.org
2012-01-21  8:21 ` pinskia at gcc dot gnu.org [this message]
2021-07-06  8:21 ` pinskia at gcc dot gnu.org
2021-11-17 10:11 ` pinskia at gcc dot gnu.org
2023-05-07  4:49 ` pinskia at gcc dot gnu.org
2023-05-08  7:38 ` cvs-commit at gcc dot gnu.org
2023-05-08  7:41 ` pinskia at gcc dot gnu.org

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