From: Marcin Borkowski <mbork@mbork.pl>
To: help-gnu-emacs@gnu.org
Subject: Re: Why is booleanp defined this way?
Date: Sat, 18 Apr 2015 09:44:46 +0200 [thread overview]
Message-ID: <87ioct7udt.fsf@mbork.pl> (raw)
In-Reply-To: <871tjint39.fsf@debian.uxu>
Hi all,
I love how I inadvertently start these huge threads... Really, I didn't
mean it!
On 2015-04-18, at 03:06, Emanuel Berg <embe8573@student.uu.se> wrote:
> "Pascal J. Bourguignon" <pjb@informatimago.com>
> writes:
>
>> You may want to compare:
>>
>> (defun normalize-boolean (obj)
>> (if obj t))
>> (disassemble (byte-compile 'normalize-boolean))
>> byte code:
>> args: (obj)
>> 0 varref obj
>> 1 goto-if-nil-else-pop 1
>> 4 constant t
>> 5:1 return
>>
>> with:
>>
>> (defun g (x) (not (not x)))
>> byte code:
>> args: (x)
>> 0 varref x
>> 1 not
>> 2 not
>> 3 return
>>
>> (disassemble (byte-compile 'f))
Fascinating. Really, I'm serious.
>
> ... you mean 'g?
>
> Are you saying (not (not x)) generates more efficient
> byte-code? I hate to break it to you, but the
> Commodore 64 demo era is long gone :)
I love to break it to you, but the C64 demoscene seems to be alive and
kicking.
Best,
--
Marcin Borkowski
http://octd.wmi.amu.edu.pl/en/Marcin_Borkowski
Faculty of Mathematics and Computer Science
Adam Mickiewicz University
next prev parent reply other threads:[~2015-04-18 7:44 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-17 20:34 Why is booleanp defined this way? Marcin Borkowski
2015-04-17 20:49 ` Jorge A. Alfaro-Murillo
[not found] ` <mailman.962.1429303822.904.help-gnu-emacs@gnu.org>
2015-04-17 23:06 ` Emanuel Berg
2015-04-18 0:41 ` Pascal J. Bourguignon
2015-04-18 1:06 ` Emanuel Berg
2015-04-18 1:23 ` Pascal J. Bourguignon
2015-04-18 7:44 ` Marcin Borkowski [this message]
2015-04-18 8:37 ` Stefan Nobis
2015-04-19 23:15 ` Emanuel Berg
2015-04-18 2:37 ` Drew Adams
2015-04-18 6:13 ` Tassilo Horn
[not found] <mailman.946.1429302909.904.help-gnu-emacs@gnu.org>
2015-04-17 20:55 ` Pascal J. Bourguignon
2015-04-17 23:20 ` Barry Margolin
2015-04-17 23:30 ` Emanuel Berg
2015-04-18 0:43 ` Pascal J. Bourguignon
2015-04-18 3:13 ` Barry Margolin
2015-04-18 3:12 ` Barry Margolin
2015-04-18 2:01 ` Rusi
2015-04-18 2:23 ` Emanuel Berg
2015-04-18 2:33 ` Rusi
2015-04-18 2:55 ` Emanuel Berg
2015-04-18 3:11 ` Barry Margolin
2015-04-18 3:35 ` Rusi
2015-04-18 4:56 ` Barry Margolin
2015-04-19 23:08 ` Emanuel Berg
2015-04-19 23:00 ` Emanuel Berg
2015-04-18 21:24 ` Emanuel Berg
2015-04-18 7:52 ` Marcin Borkowski
[not found] ` <mailman.997.1429343558.904.help-gnu-emacs@gnu.org>
2015-04-18 12:43 ` Rusi
2015-04-18 4:09 ` Pascal J. Bourguignon
2015-04-18 5:00 ` Rusi
2015-04-18 3:50 ` Pascal J. Bourguignon
2015-04-18 5:03 ` Stefan Monnier
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