Jonathan Roewen wrote:

> And since MMX deals solely with integers, the Val_long/Long_val macros
> could be implemented by a simple extra MMX instruction or two, right?

All Pentium III and later processors have the SSE instruction 
set which is like MMX, but for 32 bit floats. Pentium IV and
latter also has SSE2 which is 64 bit floats.

Personally, I find SSE and SSe2 far more interesting than MMX.

Erik
-- 
+-----------------------------------------------------------+
  Erik de Castro Lopo
+-----------------------------------------------------------+
"The music business is a cruel and shallow money trench, a long
 plastic hallway where thieves and pimps run free, and good men
 die like dogs. There's also a negative side."
   -- Hunter S. Thompson