From: Stefan Monnier <monnier@iro.umontreal.ca>
To: emacs-devel@gnu.org
Cc: Vibhav Pant <vibhavp@gmail.com>
Subject: Re: [Emacs-diffs] feature/byte-switch 7c2d493: src/bytecode.c: Add optional sanity check for jump tables.
Date: Sat, 11 Feb 2017 10:51:02 -0500 [thread overview]
Message-ID: <jwvbmu8spa0.fsf-monnier+emacsdiffs@gnu.org> (raw)
In-Reply-To: <20170211144459.A837B2319A@vcs0.savannah.gnu.org> (Vibhav Pant's message of "Sat, 11 Feb 2017 09:44:59 -0500 (EST)")
> + /* Hash tables for switch are declared with :size set to the
> + exact number of cases. */
> + if (BYTE_CODE_SAFE)
> + eassert (HASH_TABLE_SIZE (h) == h->count);
Why should we force this constraint on the code that generates the
hash-tables. I think this is wrong. We just need a comment that
explains that we use h->count as a faster approximation of
HASH_TABLE_SIZE(h) (and BTW, the comment belongs next to the relevant
code which is not the `for` loop but the "if (h->count <= 5)" test) and
that we hence leave it to the bytecompiler to ensure that this
approximation is good enough.
Stefan
next parent reply other threads:[~2017-02-11 15:51 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20170211144458.18694.21302@vcs0.savannah.gnu.org>
[not found] ` <20170211144459.A837B2319A@vcs0.savannah.gnu.org>
2017-02-11 15:51 ` Stefan Monnier [this message]
2017-02-11 17:48 ` [Emacs-diffs] feature/byte-switch 7c2d493: src/bytecode.c: Add optional sanity check for jump tables Vibhav Pant
2017-02-11 19:50 ` Stefan Monnier
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