From: Robert Boyer <robertstephenboyer@gmail.com>
To: Andreas Schwab <schwab@linux-m68k.org>
Cc: 69249@debbugs.gnu.org, Eli Zaretskii <eliz@gnu.org>,
Andrea Corallo <acorallo@gnu.org>,
Stefan Monnier <monnier@iro.umontreal.ca>,
rms@gnu.org
Subject: bug#69249: bug in native-compile?
Date: Sun, 18 Feb 2024 16:19:49 -0600 [thread overview]
Message-ID: <CAP9n0TMaXJvRdA3m+J4fyxMuTWmT07TOMwKt+noCR3c=XfzGhg@mail.gmail.com> (raw)
In-Reply-To: <8734tp5uoq.fsf@igel.home>
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This message is about how important DECLARE and THE are. If you do not
handle DECLARE and THE right, people will laugh at native-compile.
Here is an SBCL transcript. I am running on a $100 Lenovo Chromebook.
I got SBCL with the command sudo apt-get install sbcl.
* (declaim (optimize (safety 0) (speed 3) (debug 0)))
NIL
* (defun foo-with-declare (n)
(let ((i 0)
(sum 0)
(max (expt 10 n)))
(declare (fixnum i sum max))
(loop (cond ((<= i max)
(setq sum (the fixnum (+ sum i))))
(t (return sum)))
(incf i))))
FOO-WITH-DECLARE
* (time (foo-with-declare 8))
Evaluation took:
0.125 seconds of real time
0.123203 seconds of total run time (0.123193 user, 0.000010 system)
98.40% CPU
135,905,516 processor cycles
0 bytes consed
5000000050000000
* (defun foo-without-declare (n)
(let ((i 0)
(sum 0)
(max (expt 10 n)))
(loop (cond ((<= i max)
(setq sum (+ sum i)))
(t (return sum)))
(incf i))))
WARNING: redefining COMMON-LISP-USER::FOO-WITHOUT-DECLARE in DEFUN
FOO-WITHOUT-DECLARE
* (time (foo-without-declare 8))
Evaluation took:
1.080 seconds of real time
1.072932 seconds of total run time (1.072932 user, 0.000000 system)
99.35% CPU
1,181,369,303 processor cycles
0 bytes consed
5000000050000000
People go wow about 8X. How does native-compile do?
There is a great song by Alabama 'If you gonna play in Texas, you gotta
have a fiddle in the band'. Check it out!
https://www.youtube.com/watch?v=w6r4E514nJg
Bob
Bob
On Sun, Feb 18, 2024 at 3:28 PM Andreas Schwab <schwab@linux-m68k.org>
wrote:
> On Feb 18 2024, Robert Boyer wrote:
>
> > Furthermore, such declare forms are necessary for life as we know it
> > in the free world, so that fixnum arithmetic can be used where
> > appropriate!
>
> If you are programming in Emacs Lisp, you need to follow the rules of
> Emacs Lisp.
>
> --
> Andreas Schwab, schwab@linux-m68k.org
> GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1
> "And now for something completely different."
>
--
Anything I seem to state should be taken as a question. I am at least 77
and feeble.
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next prev parent reply other threads:[~2024-02-18 22:19 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-18 4:26 bug#69249: bug in native-compile? Robert Boyer
2024-02-18 19:44 ` Eli Zaretskii
2024-02-18 20:14 ` Robert Boyer
2024-02-18 21:28 ` Andreas Schwab
2024-02-18 22:19 ` Robert Boyer [this message]
2024-02-18 22:25 ` Robert Boyer
2024-02-18 22:39 ` Robert Boyer
2024-02-19 3:30 ` Eli Zaretskii
2024-02-19 3:58 ` Robert Boyer
2024-02-19 7:48 ` Andrea Corallo
2024-02-19 12:49 ` Eli Zaretskii
2024-02-18 22:45 ` Michael Heerdegen via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-02-18 23:32 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-02-18 23:42 ` Robert Boyer
2024-02-18 23:46 ` Robert Boyer
2024-02-19 15:13 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
[not found] ` <CAP9n0TOTEZJy8VXeSyMZpT59u0a434_MiwBA0LrwgjH2xc44ww@mail.gmail.com>
2024-02-20 2:51 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-02-20 3:42 ` Robert Boyer
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