John R Pierce wrote:
>
> There's another trick to this, primarily useful in assembler not C
> programming...
You can do it in C also. Its called Duff's Device. Its ugly but legal
C code.
Here a URL with info on it:
http://wwwwbs.cs.tu-berlin.de/~jutta/c/duffs-device.html
Regards,
Herb Savage
>
> Say you unroll something 16 times.... Take teh actual iteration count
> modulo 16, and JMP into the loop at that offset to start with the repeat
> counter set to the count/16. i.e. if you need to do, say, 60 iterations of
> the inner code, thats 48 + 12, so you set the loop count to 3, and jump to
> the 4th block of the 16 (16-12 = 4)
>
> Anyways, prime95 is HEAVILY unrolled, using assembler macros to generate the
> inline linear inner 'loops'.
>
> -jrp
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