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From: Zdenek Dvorak <rakdver@atrey.karlin.mff.cuni.cz> To: nobody@gcc.gnu.org Cc: gcc-prs@gcc.gnu.org, Subject: Re: optimization/10155: [3.3/3.4 regression] gcc -O2/-O3 uses excessive amount of memory Date: Fri, 02 May 2003 19:16:00 -0000 [thread overview] Message-ID: <20030502191600.8312.qmail@sources.redhat.com> (raw) The following reply was made to PR optimization/10155; it has been noted by GNATS. From: Zdenek Dvorak <rakdver@atrey.karlin.mff.cuni.cz> To: Jan Hubicka <jh@suse.cz> Cc: Steven Bosscher <s.bosscher@student.tudelft.nl>, p.van-hoof@qub.ac.uk, gcc-gnats@gcc.gnu.org, gcc-bugs@gcc.gnu.org, nobody@gcc.gnu.org, gcc-prs@gcc.gnu.org, jh@suse.de Subject: Re: optimization/10155: [3.3/3.4 regression] gcc -O2/-O3 uses excessive amount of memory Date: Fri, 2 May 2003 21:08:49 +0200 Hello, > > http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10155 > > > > How much of this can be explained with Kaveh's physmem > > patch? IIRC that patch is not in 3.2, and the increase > > in memory consumption at -O2 may be a result of that > > patch. > > > > The increase in memory at -O3 is a result of unit at a > > time compilation (which is why I CC you, Honza). You > > can check that by compiling with -O2 + all flags enabled > > at -O3 except -funit-at-a-time: > > > > ./cc1 10155.c -quiet -ftime-report -O2 > > TOTAL : 24.74 0.74 26.24 > > > > ./cc1 10155.c -quiet -ftime-report -O2 -funswitch-loops > > -frename-registers -finline-functions > > TOTAL : 31.49 0.59 33.87 > > > > Loop unswitching is responsible for most of the compile > Zdenek, this really ought not to happen, what is going on? it is just too many loops; the unswitching takes in fact almost no time (there is nothing to unswitch at all) -- all the time increase you see is in verify_loop_structure (it exhibits quadratic behavior on this kind of tests) and verify_dominators, so I guess there is not much to worry about. Zdenek
next reply other threads:[~2003-05-02 19:16 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2003-05-02 19:16 Zdenek Dvorak [this message] -- strict thread matches above, loose matches on Subject: below -- 2003-05-06 20:46 Peter van Hoof 2003-05-02 17:46 Zdenek Dvorak 2003-05-02 13:26 Jan Hubicka 2003-05-02 11:06 Steven Bosscher 2003-04-15 8:51 ebotcazou
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