[cairo] Speeding up _cairo_fixed_from_double

[Daniel Amelang]

> > > If you're interested, there's a ad-hoc way of detecting IEEE754 from
> > > other defined symbols (or by using a C99 symbol) found here:
> > > http://sourceware.org/ml/automake/2003-05/msg00046.html
> >
> > Thanks. So if we're really talking just "IBM mainframes and Cray",
> > then I don't care about those.
>
> For what it's worth, people run Firefox on S/390 machines. No, I don't
> know why.

Thank goodness it uses IEEE754 :)

http://www.research.ibm.com/journal/rd/435/schwarz.html

Dan