Author: Russell Reagan
Date: 00:22:02 01/07/03
Go up one level in this thread
On January 07, 2003 at 02:56:31, Matt Taylor wrote:
>If his program does population counts often, he may as well use an assembly
>routine. He doesn't need to write it himself; others have done that.
Even so, it's not going to amount to a hill of beans as long as he uses one that
is efficient. Unless it's significantly faster it won't make his program any
better. Even if it made his program run twice as fast, so what? That's not even
close to an extra ply unless his program is as good as or better than the best
commercial programs in the world (IE it would need a branching factor of 2.0).
And let's be realistic, it's not going to make his program go twice as fast
anyway, and his program isn't among the world's best.
He would be better off putting in an efficient popcount that he understands, and
working on his evaluation function or searching methods.
>FYI Crafty's population count and LSB/MSB scan routines are in assembly. Refer
>to X86.s and vcline.h
I was referring to this, from Crafty, boolean.c, which is the default popcount
(hince the #else).
#else
int PopCnt(register BITBOARD a) {
register int c=0;
while(a) {
c++;
a &= a - 1;
}
return(c);
}
#endif
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