Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.lang.forth > #135071
| Date | Tue, 5 May 2026 11:32:43 +1000 |
|---|---|
| MIME-Version | 1.0 |
| User-Agent | Mozilla Thunderbird |
| Subject | Re: IEEE floating point comparisons |
| Newsgroups | comp.lang.forth |
| References | <10t9259$3c72d$1@dont-email.me> <20260504094359.00003976@tin.it> <10ta3eo$3l84s$1@dont-email.me> <n5sboiFm58sU1@mid.individual.net> |
| Content-Language | en-GB |
| From | dxf <dxforth@gmail.com> |
| In-Reply-To | <n5sboiFm58sU1@mid.individual.net> |
| Content-Type | text/plain; charset=UTF-8 |
| Content-Transfer-Encoding | 7bit |
| NNTP-Posting-Host | news.ausics.net |
| Message-ID | <69f948bb$1@news.ausics.net> (permalink) |
| Organization | Ausics - https://newsgroups.ausics.net |
| Lines | 20 |
| X-Complaints | abuse@ausics.net |
| Path | csiph.com!news.bbs.nz!news.ausics.net!not-for-mail |
| Xref | csiph.com comp.lang.forth:135071 |
Show key headers only | View raw
On 5/05/2026 5:53 am, minforth wrote: > Am 04.05.2026 um 14:29 schrieb Krishna Myneni: >> ... >> I included ieee-754.4th for Forth systems which did not have +/-INF and +/-NAN defined. It also provides the extremely useful words FINFINITE? and FNAN? to check for infinities and NANs resulting from calculations, as well as FSUBNORMAL? when the results are represented with less precision than standard double precision. These words are all part of David Williams' IEEE proposal. >> >> The rationale for the signed NAN is unclear to me, but I think David had a good reason to include it in his IEEE proposal. It may be useful in some numerical computation cases. I will look into this further. >> > The sign is merely an artefact of the preceding calculation and has no > inherent significance. Even in applications that use NaN-boxing, the > possible range of values does not include the bit position of the sign. When creating constants that represent NAN the sign bit will necessarily be there. That's enough to include it in the identifier IMO. Similarly when displaying fp datum that happen to be NAN. I would rather see more information than less. When I'm told something occurred "last year" it only begs the question "exactly when?".
Back to comp.lang.forth | Previous | Next — Previous in thread | Next in thread | Find similar
IEEE floating point comparisons Krishna Myneni <krishna.myneni@ccreweb.org> - 2026-05-03 22:00 -0500
Re: IEEE floating point comparisons Krishna Myneni <krishna.myneni@ccreweb.org> - 2026-05-03 22:18 -0500
Re: IEEE floating point comparisons peter <peter.noreply@tin.it> - 2026-05-04 09:43 +0200
Re: IEEE floating point comparisons Krishna Myneni <krishna.myneni@ccreweb.org> - 2026-05-04 07:29 -0500
Re: IEEE floating point comparisons minforth <minforth@gmx.net> - 2026-05-04 21:53 +0200
Re: IEEE floating point comparisons Krishna Myneni <krishna.myneni@ccreweb.org> - 2026-05-04 17:20 -0500
Re: IEEE floating point comparisons dxf <dxforth@gmail.com> - 2026-05-05 11:32 +1000
Re: IEEE floating point comparisons Krishna Myneni <krishna.myneni@ccreweb.org> - 2026-05-06 08:23 -0500
csiph-web