Date: Tue, 4 Jan 2000 02:00:42 -0500 From: Tim Vanderhoek <vanderh@ecf.utoronto.ca> To: "Ronald F. Guilmette" <rfg@monkeys.com> Cc: "Charles M. Hannum" <root@ihack.net>, freebsd-hackers@FreeBSD.ORG, Markus Holmberg <saska@acc.umu.se>, briano@netscape.com, gatgul@voicenet.com, brendan@mozilla.org, waldemar@netscape.com, daeron@Wit401305.student.utwente.nl, clayton@netscape.com, mccabe@netscape.com Subject: Re: Should -mieee-fp equal fpsetmask(0) to avoid SIGFPE on FreeBSD? Message-ID: <20000104020041.A20965@mad> In-Reply-To: <61713.946960140@monkeys.com>; from Ronald F. Guilmette on Mon, Jan 03, 2000 at 08:29:00PM -0800 References: <el2r9fysc3s.fsf@eniwetok.ihack.net> <61713.946960140@monkeys.com>
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On Mon, Jan 03, 2000 at 08:29:00PM -0800, Ronald F. Guilmette wrote: > > >> >Question 1: What is the reason for FreeBSD to differ from other platforms > >> >and not follow the IEEE standard by default? > >> >(Please forgive me if this is an ignorant question.) [...] > >That's actually a trick question. When I researched this a few years > >ago, I found that *no* system other than NetBSD starts up in an > >IEEE-conformant mode. To wit: > > > >* iBCS2/SCO, SVR4 and FreeBSD leave exceptions unmasked. This should be a FAQ. Over time, many people have expressed their preferrence that exceptions be masked by default in FreeBSD. They are not by conscious decision. The situation can be summed by the following quote from bde: "I don't plan to change the exception handling until the other [libm ANSI conformance bugs] are fixed." The short answer is that porting is made easiest by simply calling fpsetmask(0) on FreeBSD. I couldn't find any really good references explaining all the exact details, but... References to two message by bde that are a little more explicit: Message-ID: <199802210421.PAA18491@godzilla.zeta.org.au> Message-ID: <199802210518.QAA20463@godzilla.zeta.org.au> You can use the interface at http://www.FreeBSD.org/search to search for messages by Message-ID. Also, the following PRs are relevant: URL: http://www.FreeBSD.org/cgi/query-pr.cgi?pr=105 URL: http://www.freebsd.org/cgi/query-pr.cgi?pr=229 There are many more references in the archives for the self-motivated. -- Signature withheld by request of author. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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