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From: rth@gcc.gnu.org
To: dann@godzilla.ics.uci.edu, gcc-bugs@gcc.gnu.org,
	gcc-prs@gcc.gnu.org, nobody@gcc.gnu.org
Subject: Re: optimization/5738: GCSE missed optimization
Date: Wed, 03 Apr 2002 02:25:00 -0000	[thread overview]
Message-ID: <20020403102510.3476.qmail@sources.redhat.com> (raw)

Synopsis: GCSE missed optimization

State-Changed-From-To: open->closed
State-Changed-By: rth
State-Changed-When: Wed Apr  3 02:25:09 2002
State-Changed-Why:
    That's not how partial redundancy elimination (PRE) works.
    The object with PRE is to minimize the number of evaluations
    of an expression *along a path*.  There is already one
    evaluation along each path, thus PRE considers things
    optimal.
    
    You want global value numbering or something, which we 
    don't implement.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=5738


             reply	other threads:[~2002-04-03 10:25 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-04-03  2:25 rth [this message]
  -- strict thread matches above, loose matches on Subject: below --
2003-03-15  4:46 bangerth
2002-04-04  8:16 law
2002-04-03 10:55 rth
2002-04-03 10:06 Dan Nicolaescu
2002-04-03  5:36 Daniel Berlin
2002-04-03  5:06 Daniel Berlin
2002-02-20 14:16 dann

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