From: Chong Yidong <cyd@stupidchicken.com>
To: Stefan Monnier <monnier@IRO.UMontreal.CA>
Cc: emacs-devel@gnu.org, Miles Bader <miles@gnu.org>
Subject: Re: return
Date: Fri, 03 Dec 2010 22:23:05 -0500 [thread overview]
Message-ID: <87mxomrzl2.fsf@stupidchicken.com> (raw)
In-Reply-To: <jwvtyiul3t5.fsf-monnier+emacs@gnu.org> (Stefan Monnier's message of "Fri, 03 Dec 2010 20:35:34 -0500")
Stefan Monnier <monnier@IRO.UMontreal.CA> writes:
> The Fwhile function is not used in the byte-compiled version of the
> `while' special form. Instead, the byte-compiler turns it into a bunch
> of byte-codes like test and jump to label.
> So your "with an internal catch" version should perform 100% identically
> in this test ;-)
Ah, I see. I guess the key problem is the unacceptably large
performance difference, in byte compiled code, when we wrap `while' in
an additional `catch' (1.75s vs 1.4s without the `catch' in my test).
The `catch' byte operation does this:
case Bcatch:
{
Lisp_Object v1;
BEFORE_POTENTIAL_GC ();
v1 = POP;
TOP = internal_catch (TOP, Feval, v1);
AFTER_POTENTIAL_GC ();
break;
}
So presumably it's the Feval that's killing us. Hmm.
next prev parent reply other threads:[~2010-12-04 3:23 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-26 8:57 return Lars Magne Ingebrigtsen
2010-11-26 9:19 ` return Tassilo Horn
2010-12-04 2:36 ` return Fren Zeee
2010-12-04 3:04 ` Common vs Emacs Lisp (was: Re: return) Chad Brown
2010-12-04 19:48 ` Fren Zeee
2010-12-05 10:20 ` Chad Brown
2010-12-04 6:18 ` return Stephen J. Turnbull
2010-12-04 6:49 ` return Leo
2010-11-26 9:24 ` return Miles Bader
2010-11-26 9:36 ` return Lars Magne Ingebrigtsen
2010-11-26 9:54 ` return Miles Bader
2010-11-26 10:13 ` return Lars Magne Ingebrigtsen
2010-11-26 9:44 ` return Tassilo Horn
2010-11-26 14:59 ` return Stefan Monnier
2010-11-26 15:45 ` return Lars Magne Ingebrigtsen
2010-11-26 18:40 ` return Stefan Monnier
2010-11-27 1:31 ` return Lars Magne Ingebrigtsen
2010-11-27 2:49 ` return Stefan Monnier
2010-11-27 3:06 ` return Lars Magne Ingebrigtsen
2010-12-03 18:41 ` return Chong Yidong
2010-12-03 18:43 ` return Miles Bader
2010-12-03 19:46 ` return Chong Yidong
2010-12-03 21:26 ` return Chong Yidong
2010-12-03 22:29 ` return Stefan Monnier
2010-12-03 23:00 ` return Chong Yidong
2010-12-04 1:35 ` return Stefan Monnier
2010-12-04 3:23 ` Chong Yidong [this message]
2010-12-06 16:13 ` return Davis Herring
2010-12-06 17:15 ` return Chong Yidong
2010-12-03 22:44 ` return Chong Yidong
2010-12-04 9:22 ` return Helmut Eller
-- strict thread matches above, loose matches on Subject: below --
2010-11-26 23:01 return MON KEY
2010-12-05 23:55 Return MON KEY
2010-12-06 1:48 ` Return Stephen J. Turnbull
2010-12-06 5:50 ` Return MON KEY
2010-12-06 7:20 ` Return Stephen J. Turnbull
2010-12-06 9:00 ` Return David Kastrup
2010-12-06 19:11 ` Return Stefan Monnier
2010-12-06 19:09 ` Return Stefan Monnier
2010-12-06 19:19 ` Return Chong Yidong
2010-12-06 20:27 ` Return Stefan Monnier
2010-12-07 4:47 ` Return Miles Bader
2010-12-07 9:17 ` Return David Kastrup
2010-12-07 17:10 ` Return Stefan Monnier
2010-12-07 22:15 ` Return David Kastrup
2010-12-08 15:50 ` Return Fren Zeee
2010-12-09 22:38 ` Return Stefan Monnier
2010-12-10 1:41 ` Return Stephen J. Turnbull
2010-12-10 3:44 ` Return Stefan Monnier
2010-12-10 8:28 ` Return Stephen J. Turnbull
2010-12-23 5:39 ` Return Fren Zeee
2010-12-07 12:44 ` Return Stephen J. Turnbull
2010-12-07 14:38 ` Return David Kastrup
2010-12-07 16:14 ` Return Stephen J. Turnbull
2010-12-07 17:11 ` Return tomas
2010-12-07 2:42 ` Return MON KEY
2010-12-07 14:34 ` Return Stephen J. Turnbull
2010-12-07 15:54 ` Return David Kastrup
2010-12-07 16:30 ` Return Stephen J. Turnbull
2010-12-08 13:42 ` Return Richard Stallman
2010-12-10 7:42 ` Return Daniel Colascione
2010-12-07 22:55 ` Return MON KEY
2010-12-08 7:28 ` Return Stephen J. Turnbull
2010-12-08 18:11 ` Return MON KEY
2010-12-09 8:37 ` Return Stephen J. Turnbull
2010-12-07 23:21 ` Return Samuel Bronson
2010-12-08 8:06 ` Return Stephen J. Turnbull
2010-12-08 20:51 ` Return Samuel Bronson
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