From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham autolearn_force=no version=3.4.4 X-Google-Thread: a07f3367d7,16f1030bd366bf59 X-Google-Attributes: gida07f3367d7,public,usenet X-Google-NewGroupId: yes X-Google-Language: ENGLISH,ASCII Path: g2news1.google.com!postnews.google.com!k41g2000yqm.googlegroups.com!not-for-mail From: Martin Newsgroups: comp.lang.ada Subject: Re: About the F-22 software bug Date: Sun, 7 Feb 2010 02:11:02 -0800 (PST) Organization: http://groups.google.com Message-ID: References: <4b6b15d2$0$929$ba4acef3@news.orange.fr> <4YKdnVFQX_suIPbWnZ2dnUVZ_rednZ2d@earthlink.com> <3050ef55-5dde-40ed-8a8f-a2daf245bf86@k19g2000yqc.googlegroups.com> <92a42999-0632-4bc6-8348-29140337c3c6@g29g2000yqe.googlegroups.com> <60554b4a-e36a-4daa-8c21-9600b30a40a9@m16g2000yqc.googlegroups.com> NNTP-Posting-Host: 81.129.170.5 Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Trace: posting.google.com 1265537462 1036 127.0.0.1 (7 Feb 2010 10:11:02 GMT) X-Complaints-To: groups-abuse@google.com NNTP-Posting-Date: Sun, 7 Feb 2010 10:11:02 +0000 (UTC) Complaints-To: groups-abuse@google.com Injection-Info: k41g2000yqm.googlegroups.com; posting-host=81.129.170.5; posting-account=g4n69woAAACHKbpceNrvOhHWViIbdQ9G User-Agent: G2/1.0 X-HTTP-UserAgent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.0.10, Ant.com Toolbar 1.3,gzip(gfe),gzip(gfe) Xref: g2news1.google.com comp.lang.ada:8950 Date: 2010-02-07T02:11:02-08:00 List-Id: On Feb 6, 12:12=A0pm, sjw wrote: > I agree that at the boundary you need to handle cyclic fixed point. > Back in the day, the Ferranti name for these was 'standard angle > format'; the F1600 series was a 24-bit machine, and the most > significant bit typically represented -180 degrees. Overflow was > represented by an optional check, so wrap-round was as easy as pie. SAF16 and SAF32 still in use today!! ;-) Cheers -- Martin