wish: optimize (x > 0.) floating point comparison.

[Charles M. Hannum]

> On Sat, Sep 26, 1998 at 01:32:18AM -0400, N8TM@aol.com wrote:
> > The same standard (extended double precision) was adopted by Motorola 6888[12]
> > and Intel.  
> 
> Incorrect.  Motorola uses a 96-bit format with different precision.

Don't let the 96-bit length fool you.  It's really the same format,
but with 16 bits wasted (for alignment purposes, I assume).