From: Vibhav Pant <vibhavp@gmail.com>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: "emacs-devel@gnu.org" <emacs-devel@gnu.org>
Subject: Re: [Emacs-diffs] feature/byte-switch a75d080: * src/bytecode.c: Refactor to follow GNU coding standards
Date: Sat, 11 Feb 2017 23:43:02 +0530 [thread overview]
Message-ID: <CA+T2Sh193EOUyKj7Td4zmABoFDJmwzgwDqg0oqWricOjO1L6rQ@mail.gmail.com> (raw)
In-Reply-To: <jwvh940spgv.fsf-monnier+emacsdiffs@gnu.org>
On Sat, Feb 11, 2017 at 9:16 PM, Stefan Monnier
<monnier@iro.umontreal.ca> wrote:
>> + if (BYTE_CODE_SAFE)
>> + eassert (!NILP (HASH_HASH (h, i)));
>
> Declaring that non-full hashtables are "dangerous" is rather annoying.
> In this case, I think we can do better:
>
> Lisp_Object hash_code
> = make_number (h->test.hashfn (&h->test, v1));
>
> this then lets us use EQ (hash_code, ...) instead of hash_code == XUINT
> (...) which not only correctly skips nil hashes but might even be ever
> so slightly faster (both use == on the same size of integers, but the
> former avoids the cost of XUINT).
Indeed. Since we only use hash_code when h->test.cmpfn is not NULL,
calculating it only then would also make sense (at the cost of an
extra NULL check).
--
Vibhav Pant
vibhavp@gmail.com
prev parent reply other threads:[~2017-02-11 18:13 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20170211125132.3738.13650@vcs0.savannah.gnu.org>
[not found] ` <20170211125134.80F4325FCF@vcs0.savannah.gnu.org>
2017-02-11 15:46 ` [Emacs-diffs] feature/byte-switch a75d080: * src/bytecode.c: Refactor to follow GNU coding standards Stefan Monnier
2017-02-11 18:13 ` Vibhav Pant [this message]
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