[cairo] Speeding up _cairo_fixed_from_double

[Owen Taylor]

On Sun, 2006-10-29 at 14:04 -0500, Jim Gettys wrote:
> Evil endianness trick from Xlib:
> 
>         int endian = 1; 
> 
>         if (*(char *) &endian)
>             client.byteOrder = '\154'; /* 'l' */
>         else
>             client.byteOrder = '\102'; /* 'B' */
> 
> Even more fun about this, is that the compiler ends up optimizing
> exactly what you'd like; everything is determinable at compile time, so
> only the right assignment (or branch set of code) is emitted in the
> generated code.

I can't believe that I'm contributing more to this discussion... but
I was skeptical that the compiler would actually optimize the above,
so I tried it and GCC-4.1.1, at least, doesn't.

					- Owen