On Tue, May 31, 2005 at 07:20:49PM +0200, Vincent Lefevre wrote:
> On 2005-05-31 17:10:58 +0200, Andreas Schwab wrote:
> > Scott Robert Ladd <[EMAIL PROTECTED]> writes:
> > > "Portability" means different things to different people. There's a
> > > difference between source code portability and "result" portability.
> >
> > But making round to double the default makes it only worse in this case,
> > since there is no portable way to change the rounding precision.
>
> No, if the goal is to be portable with various platforms, you need
> to round to double by default, since single precision (almost no
> longer used for FP computations) and double precision are the only
> standard precisions in IEEE 754.
IEEE 754 is not mandated by the ISO C{90,99} standards and there are indeed
platforms where float and double are not using IEEE 754 single resp. double
precision formats.
Jakub
