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From: "rguenth 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: Mon, 21 Oct 2013 08:34:00 -0000	[thread overview]
Message-ID: <bug-58806-4-3TXTbHMxli@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 #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
You cannot find the PR because it's already implemented via the "fn spec"
attribute (conveniently not user-accessible because bike-shedding about
whether separate attributes are required).  The documentation resides
in gimple.c:gimple_call_arg_flags, and I _think_ it doesn't quite provide
what you want as it was designed to help the context and flow-insensitive
points-to analysis which doesn't benefit from "this call does not clobber
or read from escaped memory".  But what it provides is "the argument to
this function does not escape" which is important.


  parent reply	other threads:[~2013-10-21  8:34 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 [this message]
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
2024-04-09  3:51 ` pinskia at gcc dot gnu.org

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