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From: Jan Hubicka <hubicka@ucw.cz>
To: walters at verbum dot org <gcc-bugzilla@gcc.gnu.org>
Cc: gcc-bugs@gcc.gnu.org
Subject: Re: [Bug middle-end/32911] Function __attribute__ ((idempotent))
Date: Tue, 15 May 2012 15:57:00 -0000	[thread overview]
Message-ID: <20120515155701.GD12754@atrey.karlin.mff.cuni.cz> (raw)
In-Reply-To: <bug-32911-4-58sZP8GXgJ@http.gcc.gnu.org/bugzilla/>

Note that I was thinking of similar attribute for C++ iostream initialization code.
Currently every unit including iostream gets a call to the iostream constructor. With LTO
we merge the constructors together and get _alot_ of redundant calls to the construction
code.  Declaring that only first call is needed would save some (quite minor) startup
overehead. (overhead of iostream startup is large, but after inlning all together it
boils down to cca 7000 redundant calls in Mozilla startup that executes quite quickly)


  reply	other threads:[~2012-05-15 15:57 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <bug-32911-4@http.gcc.gnu.org/bugzilla/>
2012-05-15 15:57 ` walters at verbum dot org
2012-05-15 15:57   ` Jan Hubicka [this message]
2012-05-15 16:00 ` hubicka at ucw dot cz
2012-05-15 16:18 ` hubicka at gcc dot gnu.org
2020-08-06 13:05 ` matthew at wil dot cx
2021-09-04 10:27 ` trass3r at gmail dot com
2024-06-01  4:09 ` egallager at gcc dot gnu.org
2007-07-27  6:33 [Bug c/32911] New: " gnu at behdad dot org
2007-07-27  9:35 ` [Bug middle-end/32911] " pinskia at gcc dot gnu dot org

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