From: Stefan Monnier <monnier@iro.umontreal.ca>
To: emacs-devel@gnu.org
Subject: Re: integer overflow handling for most-negative-fixnum
Date: Mon, 23 Jul 2018 15:57:50 -0400 [thread overview]
Message-ID: <jwvin55n2x9.fsf-monnier+gmane.emacs.devel@gnu.org> (raw)
In-Reply-To: 56ddf9aa-e7b5-6ab7-bbb8-770e3b0f4c62@cs.ucla.edu
> I can add some form of bitwidth modifiers later if we find use cases that
> can help motivate what to do about the corner cases.
Another option for the "bitwidth case" is to do it outside of `format`.
I.e. instead of
(format "%/32x" n)
you'd use
(format "%x" (truncate-to-bitwidth n 32))
where `truncate-to-bitwidth` would turn a negative number into its
positive equivalent (mod 2^bitwidth). That shouldn't be too hard to
implement in Elisp once we have bignums.
Stefan
next prev parent reply other threads:[~2018-07-23 19:57 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-19 2:39 integer overflow handling for most-negative-fixnum Andy Moreton
2018-07-20 22:10 ` Paul Eggert
2018-07-21 5:22 ` Helmut Eller
2018-07-21 9:47 ` Andy Moreton
2018-07-21 10:14 ` Eli Zaretskii
2018-07-21 13:06 ` Andy Moreton
2018-07-21 17:15 ` Stefan Monnier
2018-07-21 17:48 ` Paul Eggert
2018-07-21 18:12 ` Stefan Monnier
2018-07-23 19:18 ` Paul Eggert
2018-07-23 19:57 ` Stefan Monnier [this message]
2018-07-23 23:09 ` Paul Eggert
2018-07-21 20:10 ` Helmut Eller
2018-07-21 21:02 ` Helmut Eller
2018-07-23 19:40 ` Paul Eggert
2018-07-21 18:10 ` Eli Zaretskii
2018-07-21 18:17 ` Paul Eggert
2018-07-21 18:23 ` Eli Zaretskii
2018-07-21 18:42 ` Stefan Monnier
2018-07-21 18:51 ` Eli Zaretskii
2018-07-21 20:42 ` Stefan Monnier
2018-07-21 12:42 ` Helmut Eller
2018-07-21 17:46 ` Paul Eggert
2018-07-23 11:49 ` Andy Moreton
2018-07-23 17:30 ` Paul Eggert
2018-07-23 21:11 ` Andy Moreton
2018-07-24 12:14 ` Andreas Schwab
2018-07-24 13:06 ` Andy Moreton
2018-07-21 9:49 ` Paul Eggert
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