Date: Fri, 24 Dec 1999 12:51:23 +0200 From: Sheldon Hearn <sheldonh@uunet.co.za> To: Ben Smithurst <ben@scientia.demon.co.uk> Cc: Bosko Milekic <bmilekic@dsuper.net>, hackers@FreeBSD.ORG Subject: Re: SIGFPE on arithmetic overflow Message-ID: <76436.946032683@axl.noc.iafrica.com> In-Reply-To: Your message of "Fri, 24 Dec 1999 10:37:35 GMT." <19991224103735.A649@strontium.scientia.demon.co.uk>
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On Fri, 24 Dec 1999 10:37:35 GMT, Ben Smithurst wrote: > > Could somebody try this piece of code on a -STABLE machine, just out of > > curiosity...? > > I did, it gets SIGFPE too. I think this boils down to my lack of understanding of IEEE floating point arithmetic standards. The following code behaves the same on every box I can find to test it on. Although I'm surprised that the exception is INV instead of OFL, it seems to be standard behaviour. Ciao, Sheldon. #include <ieeefp.h> #include <stdio.h> void do_weird(void) { double x; int i; printf("double x = 1e19; int i = (int)x\n"); x = 1e19; i = (int)x; printf("%d\n", i); } int main(void) { printf("clearing fp exception mask\n"); (void)fpsetmask(0); do_weird(); printf("setting fp exception mask to FP_X_OFL\n"); (void)fpsetmask(FP_X_OFL); do_weird(); printf("setting fp exception mask to FP_X_INV\n"); (void)fpsetmask(FP_X_INV); do_weird(); return 0; } To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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