[Open-graphics] Multipliers in oga1hq

[Nicholas S-A]

> There's loop control overhead, too:
> ...
> Which is 32 * (7 or 8) + 2 = 226-258 cycles, I guess.  Still around 
> 200,
> as you said, but it's also still an order of magnitude slower than the 
> same
> algorithm implemented in hardware (and I believe it would be 
> comparatively
> cheap in hardware).  As for whether or not that's horrible, well, it's 
> a matter
> of opinion. :)

That was actually my original version, but I didn't want to look at the 
docs
to find the branch delay, and figured I could say to anybody who brought
this up that we would just unfold all the loops (which we would for 
this). ;-)

Yes, I agree that hardware is much, much better, even with just an MSTEP
instruction (which could just do the two shifts and tested-add), but I 
did want
to bring up that it is not <horrible> if we are pressed for space in 
the XP10 and
need to do software multiply.

Cheers!
nick