Date: Tue, 4 Jan 2000 09:36:59 -0500 (EST) From: Kelly Yancey <kbyanc@posi.net> To: Martin Cracauer <cracauer@cons.org> Cc: Markus Holmberg <saska@acc.umu.se>, freebsd-hackers@FreeBSD.ORG Subject: Re: Should -mieee-fp equal fpsetmask(0) to avoid SIGFPE on FreeBSD? Message-ID: <Pine.BSF.4.05.10001040934070.32954-100000@kronos.alcnet.com> In-Reply-To: <20000104121459.A8959@cons.org>
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>
> #include <stdio.h>
> #include <limits.h>
> #include <floatingpoint.h>
>
> int main(void)
> {
> double bla;
> int foo;
>
> fpsetmask(0);
> bla = (double)INT_MAX + 1.0;
> foo = bla;
>
> printf("Result: %d\n", foo);
>
> return 0;
> }
>
> Result: -2147483648
>
>
Actually, this the same value (INT_MIN = -2147483648) you would get if
you just said foo = INT_MAX + 1 since in 2's complement notation INT_MIN =
INT_MAX + 1. It definately isn't garbage. Nonetheless, your point is
valid, floating point exceptions do exist for a purpose.
Kelly
--
Kelly Yancey - kbyanc@posi.net - Richmond, VA
Analyst / E-business Development, Bell Industries http://www.bellind.com/
Maintainer, BSD Driver Database http://www.posi.net/freebsd/drivers/
Coordinator, Team FreeBSD http://www.posi.net/freebsd/Team-FreeBSD/
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