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From: "rakdver at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/34683] SSA rewriting in the loop unroller causes quadratic behavior
Date: Sat, 12 Jan 2008 08:39:00 -0000	[thread overview]
Message-ID: <20080112035929.23612.qmail@sourceware.org> (raw)
In-Reply-To: <bug-34683-14773@http.gcc.gnu.org/bugzilla/>



------- Comment #48 from rakdver at gcc dot gnu dot org  2008-01-12 03:59 -------
(In reply to comment #47)
> Most of the PRE/FRE memory is spent in copied VOPs VECs.  Unfortunately we
> cannot move them to heap memory easily as the get shared in the PRE tables...
> I tried to be explicit in managing the memory, but it gets really hard (which
> is probably the reason we stick it in GC memory in the first place).

in fact, it copies the VOPS list of each store statement 50 times on average
(once for PRE and once for FRE, i.e., about 100x total).  Cannot sccvn be
throttled down somehow so that it does not spend so much memory this way?


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34683


      parent reply	other threads:[~2008-01-12  4:00 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-05 23:51 [Bug tree-optimization/34683] New: compile-time problem with -fstrict-aliasing jaydub66 at gmail dot com
2008-01-06  0:37 ` [Bug tree-optimization/34683] " jaydub66 at gmail dot com
2008-01-06  0:55 ` pinskia at gcc dot gnu dot org
2008-01-06  6:47 ` jaydub66 at gmail dot com
2008-01-06  8:08 ` jaydub66 at gmail dot com
2008-01-06  9:09 ` jvdelisle at gcc dot gnu dot org
2008-01-06 10:08 ` rguenth at gcc dot gnu dot org
2008-01-06 10:35 ` [Bug fortran/34683] Fortran FE generated IL pessimizes middle-end IL and analysis rguenth at gcc dot gnu dot org
2008-01-06 11:10 ` burnus at gcc dot gnu dot org
2008-01-06 11:14 ` rguenth at gcc dot gnu dot org
2008-01-06 11:46 ` rguenth at gcc dot gnu dot org
2008-01-06 12:02 ` rguenth at gcc dot gnu dot org
2008-01-06 12:02 ` rguenth at gcc dot gnu dot org
2008-01-06 12:08 ` rguenth at gcc dot gnu dot org
2008-01-06 12:19 ` rguenth at gcc dot gnu dot org
2008-01-06 12:30 ` rguenth at gcc dot gnu dot org
2008-01-06 22:15 ` jaydub66 at gmail dot com
2008-01-06 22:24 ` rguenther at suse dot de
2008-01-06 22:24 ` [Bug middle-end/34683] [4.3 Regression] " pinskia at gcc dot gnu dot org
2008-01-07 14:05 ` [Bug tree-optimization/34683] " rguenth at gcc dot gnu dot org
2008-01-07 15:00 ` rguenth at gcc dot gnu dot org
2008-01-07 15:20 ` rguenth at gcc dot gnu dot org
2008-01-07 16:18 ` rguenth at gcc dot gnu dot org
2008-01-07 16:41 ` rguenth at gcc dot gnu dot org
2008-01-07 17:28 ` rguenth at gcc dot gnu dot org
2008-01-08 10:18 ` rguenth at gcc dot gnu dot org
2008-01-08 10:27 ` rguenth at gcc dot gnu dot org
2008-01-08 12:18 ` rguenth at gcc dot gnu dot org
2008-01-08 12:22 ` rguenth at gcc dot gnu dot org
2008-01-08 12:31 ` steven at gcc dot gnu dot org
2008-01-08 12:41 ` steven at gcc dot gnu dot org
2008-01-08 12:57 ` rguenth at gcc dot gnu dot org
2008-01-08 13:02 ` rguenth at gcc dot gnu dot org
2008-01-08 13:56 ` steven at gcc dot gnu dot org
2008-01-08 16:50 ` rguenth at gcc dot gnu dot org
2008-01-08 21:36 ` rguenth at gcc dot gnu dot org
2008-01-09  1:09 ` steven at gcc dot gnu dot org
2008-01-09 10:32 ` rguenther at suse dot de
2008-01-09 10:32 ` jaydub66 at gmail dot com
2008-01-09 10:35 ` [Bug tree-optimization/34683] [4.3 Regression] SSA rewriting in the loop unroller causes quadratic behavior steven at gcc dot gnu dot org
2008-01-10 15:05 ` rguenth at gcc dot gnu dot org
2008-01-10 15:29 ` rguenth at gcc dot gnu dot org
2008-01-10 16:00 ` rguenth at gcc dot gnu dot org
2008-01-10 17:57 ` rguenth at gcc dot gnu dot org
2008-01-10 18:05 ` rguenth at gcc dot gnu dot org
2008-01-10 18:08 ` [Bug tree-optimization/34683] " rguenth at gcc dot gnu dot org
2008-01-10 18:24 ` steven at gcc dot gnu dot org
2008-01-10 22:19 ` jaydub66 at gmail dot com
2008-01-10 23:45 ` steven at gcc dot gnu dot org
2008-01-11 13:58 ` rguenth at gcc dot gnu dot org
2008-01-12  8:39 ` rakdver at gcc dot gnu dot org [this message]

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