> Date: Mon, 18 Feb 2002 15:23:34 -0500 (EST) > From: Stephen L Moshier <moshier@moshier.net> > On Mon, 18 Feb 2002, Geoff Keating wrote: > > > ... actually, C99 seems to imply that all supported rounding > > precisions should work for the math library > > Could you point out specifically where it says that? It would have to specifically say that it doesn't, and I can't find that. For example, in s. 7.12.1 para 4, it says that HUGE_VAL is a guaranteed result only in the default rounding mode. Appendix F says, in s. F.9 para 10, "Whether the [elementary] functions honour the rounding direction mode is implementation-defined." but this doesn't allow the functions to produce invalid results, just to ignore the mode and use some other mode instead. A good math library should honour the current rounding mode, as this is what is most useful. -- - Geoffrey Keating <geoffk@geoffk.org> <geoffk@redhat.com>
