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From: "glisse at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/58806] New attribute for functions that access memory only through their arguments
Date: Tue, 22 Oct 2013 20:27:00 -0000	[thread overview]
Message-ID: <bug-58806-4-ljUhe6hcrr@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-58806-4@http.gcc.gnu.org/bugzilla/>

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58806

--- Comment #5 from Marc Glisse <glisse at gcc dot gnu.org> ---
Created attachment 31074
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31074&action=edit
experimental patch

This optimizes the testcase in comment #0 if I mark g with the attribute
"no_global_write" and use some way of marking g's argument as EAF_DIRECT. Maybe
it would be easier to have the no_global_write attribute (possibly with a
different name) imply EAF_DIRECT on the arguments, as it gets tricky trying to
see what we may alias by following an arbitrary chain starting at a given
pointer.


  parent reply	other threads:[~2013-10-22 20:27 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <bug-58806-4@http.gcc.gnu.org/bugzilla/>
2013-10-21  2:14 ` glisse at gcc dot gnu.org
2013-10-21  8:34 ` rguenth at gcc dot gnu.org
2013-10-22 11:32 ` glisse at gcc dot gnu.org
2013-10-22 14:58 ` glisse at gcc dot gnu.org
2013-10-22 20:27 ` glisse at gcc dot gnu.org [this message]
2024-04-09  3:51 ` pinskia at gcc dot gnu.org

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