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From: Ihor Radchenko <yantar92@posteo.net>
To: Emanuel Berg <incal@dataswamp.org>
Cc: emacs-devel@gnu.org
Subject: Re: [PATCH] Re: Bignum performance (was: Shrinking the C core)
Date: Tue, 15 Aug 2023 15:01:23 +0000	[thread overview]
Message-ID: <87zg2spcxo.fsf@localhost> (raw)
In-Reply-To: <875y5gh075.fsf@dataswamp.org>

Emanuel Berg <incal@dataswamp.org> writes:

>>     ;; (declare (type (unsigned-byte 53) reps num z))
>> ...
>> Still ~3x faster compared to Elisp, but not orders
>> of magnitude.
>
> A pretty good optimization! :O
>
> But what kind of optimization is it?

The commented "optimization" is: "Hey, SBCL, do not use bignums. If ints
overflow, so be it".

> Also, what happens if you remove the OPTIMIZE declaration
> as well?

No difference.

> Still, isn't the rule of the "beat the benchmark" game to beat
> it as fast as possible?

Yes, but when CBCL is orders of magnitude faster, it indicates something
conceptually wrong in the algo. 3x is a matter of variation in the
internal details (like extra type checking in Elisp that Po Lu outlined).

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>



  reply	other threads:[~2023-08-15 15:01 UTC|newest]

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-08-14  6:28 [PATCH] Re: Bignum performance (was: Shrinking the C core) Gerd Möllmann
2023-08-14  6:56 ` Gerd Möllmann
2023-08-14  7:04   ` Ihor Radchenko
2023-08-14  7:35     ` Gerd Möllmann
2023-08-14  8:09       ` Ihor Radchenko
2023-08-14  9:28         ` Gerd Möllmann
2023-08-14  9:42           ` Ihor Radchenko
2023-08-15 14:03             ` Emanuel Berg
2023-08-15 15:01               ` Ihor Radchenko [this message]
2023-08-15 22:21                 ` Emanuel Berg
2023-08-15 22:33                 ` Emanuel Berg
2023-08-16  4:36                   ` tomas
2023-08-16  5:23                     ` Emanuel Berg
2023-08-14 16:51           ` Emanuel Berg
2023-08-15  4:58             ` Gerd Möllmann
2023-08-15 14:20               ` Emanuel Berg
2023-08-15  6:26             ` [PATCH] Re: Bignum performance Po Lu
2023-08-15 14:33               ` Emanuel Berg
2023-08-15 17:07                 ` tomas
2023-08-15 22:46                   ` Emanuel Berg
2023-08-16  1:31                 ` Po Lu
2023-08-16  1:37                   ` Emanuel Berg
2023-08-16  3:17                     ` Po Lu
2023-08-16  4:44                       ` tomas
2023-08-16  5:18                       ` Gerd Möllmann
2023-08-16  5:35                         ` Emanuel Berg
2023-08-18  7:14                           ` Simon Leinen
2023-08-19 13:10                             ` Emanuel Berg
2023-08-20  5:07                               ` Ihor Radchenko
2023-08-20  6:20                                 ` Emanuel Berg
2023-08-28  5:32                                 ` Emanuel Berg
2023-09-03  0:48                                   ` Emanuel Berg
2023-09-03  8:50                                     ` Ihor Radchenko
2023-09-03  9:05                                       ` Emanuel Berg
2023-09-03 10:30                                         ` Elisp native-comp vs. SBCL for inclist-type-hints benchmark (was: [PATCH] Re: Bignum performance) Ihor Radchenko
2023-09-04  1:03                                           ` Emanuel Berg
2023-09-03  1:57                                   ` [PATCH] Re: Bignum performance Emanuel Berg
2023-09-04  4:13                             ` Emanuel Berg
2023-08-16  5:41                         ` Gerd Möllmann
2023-08-16  6:42                         ` Po Lu
2023-08-16  8:05                           ` Gerd Möllmann
  -- strict thread matches above, loose matches on Subject: below --
2023-08-09  9:46 Shrinking the C core Eric S. Raymond
2023-08-09 12:34 ` Po Lu
2023-08-09 15:51   ` Eric S. Raymond
2023-08-09 23:56     ` Po Lu
2023-08-10  1:19       ` Eric S. Raymond
2023-08-10  7:44         ` Eli Zaretskii
2023-08-10 21:54           ` Emanuel Berg
2023-08-11 10:27             ` Bignum performance (was: Shrinking the C core) Ihor Radchenko
2023-08-11 12:10               ` Emanuel Berg
2023-08-11 12:32                 ` Ihor Radchenko
2023-08-11 12:38                   ` Emanuel Berg
2023-08-11 14:07                     ` [PATCH] " Ihor Radchenko
2023-08-11 18:06                       ` Emanuel Berg
2023-08-11 19:41                         ` Ihor Radchenko
2023-08-11 19:50                           ` Emanuel Berg
2023-08-12  8:24                             ` Ihor Radchenko
2023-08-12 16:03                               ` Emanuel Berg
2023-08-13  9:09                                 ` Ihor Radchenko
2023-08-13  9:49                                   ` Emanuel Berg
2023-08-13 10:21                                     ` Ihor Radchenko
2023-08-14  2:20                                       ` Emanuel Berg
2023-08-14  7:20                                         ` Ihor Radchenko
2023-08-11 22:46                           ` Emanuel Berg
2023-08-12  8:30                             ` Ihor Radchenko
2023-08-12 16:22                               ` Emanuel Berg
2023-08-13  9:12                                 ` Ihor Radchenko

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