Date: Mon, 13 May 2002 11:13:58 -0700 From: Bill Fenner <fenner@research.att.com> To: obrien@FreeBSD.ORG Cc: standards@FreeBSD.ORG Subject: Re: signbit ISO C99 macro Message-ID: <200205131813.LAA19960@windsor.research.att.com>
next in thread | raw e-mail | index | archive | help
It's easy if it's easy to treat doubles as uint64_t's. Like, I think signbit() might be something like #define signbit(d) (*((uint64_t *)&(d)) & UINT64_C(0x8000000000000000)) or maybe #define signbit(d) (*((uint64_t *)&(d)) >> 63) However, that assumes that d is an IEEE double (and there is a possibly-incorrect assumption about byte order). I don't know how to implement a macro that will take any real-floating type. Bill To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-standards" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200205131813.LAA19960>