From: Stefan Monnier <monnier@IRO.UMontreal.CA>
To: Julien Danjou <julien@danjou.info>
Cc: emacs-devel@gnu.org
Subject: Re: Type-error in C code
Date: Tue, 16 Nov 2010 12:05:00 -0500 [thread overview]
Message-ID: <jwv1v6lyzld.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <87wrodjn27.fsf@keller.adm.naquadah.org> (Julien Danjou's message of "Tue, 16 Nov 2010 16:38:40 +0100")
>> Same problem as the structs type: it's not optimized as well as the
>> int/long... types.
> May I ask any references about that?
> Not that I don't trust you, but I'd like to know why.
IIRC calling conventions usually dictate that non-scalar types get
passed via copies on the stack rather than in registers.
Also of course, in general structs can't be handled in the same way as
int/long/... by the compiler, so in order to handle single-slot structs
efficiently, the compiler needs to special case these. I'd expect
a mature C compiler to go through the trouble to try and special-case
them, but that's no guarantee that it's going to be as efficient as just
scalar types.
Stefan
next prev parent reply other threads:[~2010-11-16 17:05 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-12 14:02 Type-error in C code Stefan Monnier
2010-11-12 14:21 ` Julien Danjou
2010-11-12 15:12 ` Jan Djärv
2010-11-12 15:22 ` Julien Danjou
2010-11-12 15:28 ` Julien Danjou
2010-11-12 15:32 ` Julien Danjou
2010-11-12 15:48 ` Eli Zaretskii
2010-11-12 15:58 ` Julien Danjou
2010-11-12 16:06 ` John Yates
2010-11-12 16:20 ` Eli Zaretskii
2010-11-12 16:47 ` Andreas Schwab
2010-11-12 19:44 ` Miles Bader
2010-11-12 15:48 ` Eli Zaretskii
2010-11-12 17:13 ` Jan D.
2010-11-12 21:15 ` Thien-Thi Nguyen
2010-11-13 19:19 ` Jan Djärv
2010-11-13 19:52 ` Thien-Thi Nguyen
2010-11-13 22:23 ` Jan Djärv
2010-11-13 20:38 ` Johan Bockgård
2010-11-14 10:21 ` Jan Djärv
2010-11-12 18:45 ` Andreas Schwab
2010-11-12 21:00 ` Stefan Monnier
2010-11-15 21:11 ` Julien Danjou
2010-11-15 21:19 ` Andreas Schwab
2010-11-16 5:43 ` Stefan Monnier
2010-11-16 7:56 ` Julien Danjou
2010-11-16 9:05 ` Stephen J. Turnbull
2010-11-16 9:28 ` Julien Danjou
2010-11-16 12:11 ` Stephen J. Turnbull
2010-11-16 15:14 ` Stefan Monnier
2010-11-16 15:38 ` Julien Danjou
2010-11-16 17:05 ` Stefan Monnier [this message]
2010-11-16 9:36 ` Andreas Schwab
2010-11-13 20:00 ` Julien Danjou
2010-11-15 16:08 ` Stefan Monnier
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