Date: Thu, 3 Dec 1998 11:40:55 -0800 (PST) From: Julian Elischer <julian@whistle.com> To: Mark Tinguely <tinguely@plains.NoDak.edu> Cc: freebsd-current@FreeBSD.ORG Subject: Re: 3.0 and double operations in device drivers Message-ID: <Pine.BSF.3.95.981203113948.1848A-100000@current1.whistle.com> In-Reply-To: <199812031513.JAA18762@plains.NoDak.edu>
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it always was taboo.. floating point operations need a process context to store results etc. in the case of context changes (e.g. interrupts) etc. BDE can be more accurate on this point I'm sure. julian On Thu, 3 Dec 1998, Mark Tinguely wrote: > I was testing a device driver that I wrote for FreeBSD 2.2.x on a > FreeBSD 3.0-RELEASE. When some double multiplication and divisions > were executed, the system froze. > > It took a long time to find it was a FP problem, it acted like > some aweful infinite loop. > > These routines are only used on a circuit setup to calculate some scheduling > parameters, and I guess they can be done with integer math after some head > scratching. > > My question is: "Is floating point math now taboo in the kernel?" > > --mark. > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-current" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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