Date: Tue, 21 Mar 2000 10:28:43 +0100 From: Martin Cracauer <cracauer@cons.org> To: David Malone <dwmalone@maths.tcd.ie> Cc: Martin Cracauer <cracauer@cons.org>, current@FreeBSD.ORG Subject: Re: Floating point exceptions. Message-ID: <20000321102843.A1455@cons.org> In-Reply-To: <200003210924.aa02305@salmon.maths.tcd.ie>; from dwmalone@maths.tcd.ie on Tue, Mar 21, 2000 at 09:24:09AM %2B0000 References: <20000321095024.A1011@cons.org> <200003210924.aa02305@salmon.maths.tcd.ie>
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In <200003210924.aa02305@salmon.maths.tcd.ie>, David Malone wrote: > > > There was a discussion on one of the list about what to do for > > > floating point excpetions recently, and I thought people decided > > > that causing a signal by default was a right thing? > > > > The outcome was that applications that care must set the control word > > themself and that we go the way of least resistance for the rest. > > OK - I just did a quick scout around. Digital Unix gives a SIGFPE; > Solaris, AIX and Redhat print some captalisation of "Inf"; HP/UX > prints "++.000000" ;-) > > Is there a way of setting the control word which is in any sense > portable? It is an i386 assembler instruction. Obviously, operating system vendors thought it's not their business, but the compiler's. Unfortunately, gcc doesn't care (although most other native compilers like SRC m3, CMUCL, SML/NJ do). FreeBSD's fpsetmask(3) stuff is simple inline assembler that I personally used in Linux, it should be relativly easy to carry it around with your application on i386 machines. Martin -- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Martin Cracauer <cracauer@cons.org> http://www.cons.org/cracauer/ Tel.: (private) +4940 5221829 Fax.: (private) +4940 5228536 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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