From: "Stephen J. Turnbull" <stephen@xemacs.org>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: Dmitry Antipov <dmantipov@yandex.ru>,
Emacs development discussions <emacs-devel@gnu.org>
Subject: Re: [RFC, PATCH] shrink struct vectorlike_header #2
Date: Thu, 08 Nov 2012 15:56:04 +0900 [thread overview]
Message-ID: <874nl0vb0b.fsf@uwakimon.sk.tsukuba.ac.jp> (raw)
In-Reply-To: <jwvzk2shjy7.fsf-monnier+emacs@gnu.org>
Stefan Monnier writes:
> I doubt (*(struct Lisp_Vector **)((char *) v + header_size))
> is any better. I guess it just defeats gcc's detection of the
> problem.
Not true, in general. Martin Buchholz (IIRC) reported that (at
least for some constructs, for some versions of GCC, and specific
optimization settings -- this was a few years ago) such gymnastics
change the code generated (presumably from something incorrect to
something correct).
next prev parent reply other threads:[~2012-11-08 6:56 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-11 6:41 [PATCH] shrink struct vectorlike_header Dmitry Antipov
2012-10-11 12:57 ` Stefan Monnier
2012-11-06 17:09 ` [RFC, PATCH] shrink struct vectorlike_header #2 Dmitry Antipov
2012-11-06 18:17 ` Stefan Monnier
2012-11-07 14:57 ` Dmitry Antipov
2012-11-08 3:08 ` Stefan Monnier
2012-11-08 5:25 ` Paul Eggert
2012-11-08 13:31 ` Dmitry Antipov
2012-11-08 14:03 ` Stefan Monnier
2012-11-08 14:45 ` Dmitry Antipov
2012-11-08 15:08 ` Dmitry Antipov
2012-11-08 16:30 ` Paul Eggert
2012-11-08 17:12 ` Andreas Schwab
2012-11-08 17:42 ` Nix
2012-11-09 18:04 ` Andreas Rottmann
2012-11-08 6:56 ` Stephen J. Turnbull [this message]
2012-11-06 20:53 ` Paul Eggert
2012-11-06 21:28 ` Eli Zaretskii
2012-10-11 16:42 ` [PATCH] shrink struct vectorlike_header Eli Zaretskii
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