On 2005-05-31 15:33:48 +0200, Andreas Schwab wrote: > Vincent Lefevre <[EMAIL PROTECTED]> writes: > > On 2005-05-31 14:27:01 +0200, Andreas Schwab wrote: > >> Vincent Lefevre <[EMAIL PROTECTED]> writes: > >> > But as I said on my page, this isn't much a problem since users > >> > who really need *extended* precision can still set the rounding > >> > precision to extended precision; this isn't portable, but extended > >> > precision isn't portable anyway. > >> > >> What about LDBL_* from <float.h>? > > > > What do you mean here? > > They give you access to long double in a portable manner,
No, this is not portable, since if extended precision is necessary to get correct results for some application, the same application run on PowerPC, where there is no extended precision, would give incorrect results. > but if you change the rounding mode then the constants are no longer > accurate. The implementation could provide another way to get the necessary information; perhaps nextafterl()... -- Vincent Lefèvre <[EMAIL PROTECTED]> - Web: <http://www.vinc17.org/> 100% accessible validated (X)HTML - Blog: <http://www.vinc17.org/blog/> Work: CR INRIA - computer arithmetic / SPACES project at LORIA
