Date: Thu, 31 Oct 2002 20:02:19 +1100 (EST) From: Bruce Evans <bde@zeta.org.au> To: Terry Lambert <tlambert2@mindspring.com> Cc: "M. Warner Losh" <imp@bsdimp.com>, <rittle@labs.mot.com>, <rittle@latour.rsch.comm.mot.com>, <current@FreeBSD.ORG>, <dschultz@uclink.Berkeley.EDU> Subject: Re: Lack of real long double support Message-ID: <20021031200004.R8632-100000@gamplex.bde.org> In-Reply-To: <3DC06CE4.57CF2F96@mindspring.com>
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On Wed, 30 Oct 2002, Terry Lambert wrote: > This is the basis of Bruce's complaint: > > http://docs.freebsd.org/cgi/getmsg.cgi?fetch=1099099+0+archive/2002/freebsd-current/20021027.freebsd-current > > | gcc can't actually support the full range, since it doesn't control > | the runtime environement (it could issue a fninit before main() to > | change the default, but it shouldn't and doesn't). The exponent > | range is lost long before printf() is reached. E.g., > | > | long double x= DBL_MAX; > | long double y = 2 * x; > | > | gives +Inf for y since the result is doesn't fit in 53-bit precision. > | The system header correctly reports this default precision. Any header > | genrated by the gcc build should be no different, since the build should > | run in the target environment. Please forget this wrong example :-). The precision doesn't affect the exponent range. Bruce To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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