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From: "terra at gnome dot org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/56888] memcpy implementation optimized as a call to memcpy Date: Fri, 06 Jun 2014 10:40:00 -0000 [thread overview] Message-ID: <bug-56888-4-vN259sW66W@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-56888-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56888 M Welinder <terra at gnome dot org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |terra at gnome dot org --- Comment #31 from M Welinder <terra at gnome dot org> --- Extra complication: the C library's memcpy may change errno to any non-zero value if it so desires. (C99 section 7.5 #5.) That means that raw calls to memcpy (and friends) cannot be generated anywhere where the compiler is unable to prove that the value of errno isn't used. Extra code to store and restore errno must be emitted otherwise.
next prev parent reply other threads:[~2014-06-06 10:40 UTC|newest] Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top 2013-04-08 23:40 [Bug middle-end/56888] New: " xanclic at gmail dot com 2013-04-09 9:59 ` [Bug middle-end/56888] " mikpe at it dot uu.se 2013-04-09 10:01 ` rguenth at gcc dot gnu.org 2013-04-09 10:01 ` jakub at gcc dot gnu.org 2013-04-09 13:02 ` xanclic at gmail dot com 2013-04-09 13:17 ` rguenther at suse dot de 2013-04-09 13:20 ` xanclic at gmail dot com 2013-04-11 11:29 ` rguenth at gcc dot gnu.org 2013-06-23 0:01 ` jeff@deseret-tech.com 2013-07-17 7:52 ` paulo@matos-sorge.com 2013-07-17 17:10 ` brooks at gcc dot gnu.org 2013-07-17 17:28 ` xanclic at gmail dot com 2013-07-17 20:36 ` schwab@linux-m68k.org 2013-07-17 20:59 ` xanclic at gmail dot com 2013-07-17 22:31 ` schwab@linux-m68k.org 2013-07-18 0:26 ` xanclic at gmail dot com 2013-07-18 10:35 ` paulo@matos-sorge.com 2013-07-28 3:30 ` bugdal at aerifal dot cx 2013-10-02 7:59 ` bernd.edlinger at hotmail dot de 2013-10-02 8:17 ` rguenth at gcc dot gnu.org 2013-10-02 8:49 ` bernd.edlinger at hotmail dot de 2013-10-02 8:59 ` rguenther at suse dot de 2014-02-17 3:48 ` janosch.rux at web dot de 2014-04-29 13:50 ` rguenth at gcc dot gnu.org 2014-04-29 13:57 ` rguenth at gcc dot gnu.org 2014-04-29 14:47 ` bugdal at aerifal dot cx 2014-05-06 10:51 ` rguenth at gcc dot gnu.org 2014-05-06 10:52 ` rguenth at gcc dot gnu.org 2014-06-06 10:40 ` terra at gnome dot org [this message] 2014-06-06 11:54 ` rguenther at suse dot de 2014-11-03 7:09 ` fd935653 at opayq dot com 2020-08-16 22:51 ` pinskia at gcc dot gnu.org 2022-06-03 6:55 ` pinskia at gcc dot gnu.org 2022-10-26 17:06 ` pinskia at gcc dot gnu.org 2023-12-18 20:59 ` terra at gnome dot org 2023-12-18 21:32 ` david at westcontrol dot com 2023-12-19 2:07 ` terra at gnome dot org 2023-12-19 8:03 ` rguenth at gcc dot gnu.org 2023-12-19 8:06 ` rguenth at gcc dot gnu.org 2023-12-19 8:28 ` david at westcontrol dot com
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