Re: [B2-devel] Fixes for the generic FPU emulation core

[<gb...@di...>]

Hi,

> I just grepped all the compiler include files with "float80" and
> "quadruple" -- no [relevant] hits. But it's always possible that
> I'm missing something.

The compiler may handle tokens starting with "__" internally. I am sorry
but I don't have VC++ documentation. BTW, CodeWarrior only has 64-bit
long doubles as well.

> >I think that an implementation claiming IEEE-754 compliance would have
> >adequate float and double type representations. long doubles could also
> >be 128-bit long.
> 
> Yes ... strictly speaking it's compliant, but adequate? Not for
> our purposes at least :) 

Reading the C standard again, I came up with <fenv.h> which gives access
to the floating-point environment. Something to explore further. i.e.
check if the implementation provides fenv_t, fexcept_t, FE_INEXACT, ...

Problem: that doesn't appear to be part of the C++ standard but using C
from C++ is not a problem ;-)

Another problem: all C implementations may not provide those features
yet. CodeWarrior appears to support that. GCC and an old glibc 2.0.x
doesn't but it seems that glibc 2.1.x will (?).

-- 
Gwenolé Beauchesne