On Tue, 27 Jun 2000, Steve Kargl wrote:
> Daniel Eischen wrote:
> >
> > Oddly, this causes problems with GNAT (Ada is a high level language)
> > because it wants/expects 64-bit extended precision. It seems as if
> > GNAT for linux-i386 also uses 64-bit extended precision. The only
> > other GNAT i386 platform that doesn't use 64-bit precision is NT.
> >
> > So is the above comment still valid?
> >
>
> Does GNAT use the math library in /usr/lib? I've been testing
> our math library against UCBTEST, and there appear to be some
> pecularities. I need to dig deeper to understand all the info
> produced by UCBTEST. The point of this note is that turning on
> 64-bit extended precision in GNAT might be compromised by libm.a.
Yeah, I kinda wondered how this would affect libm.a (after I
changed GNAT to use extended precision :( ). GNAT does provide
an Ada interface to some of the math functions in libm. You
can configure GNAT to use either a 64-bit or 53-bit precision
interface to the math functions. Actually, you can configure
it to use 53-bit precision floating point numbers for everything
else, but I based this part of the run-time on the Linux run-time
which uses 64-bit precision.
The more I think about it, I think I should just teach GNAT
to expect 53-bit precision floating points and not change the
precision of the FP processor.
--
Dan Eischen
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