count of bits set in a long
Rich Salz
rsalz at bbn.com
Thu Sep 27 06:55:58 AEST 1990
X11R4/src/mit/server/dix/devices.c:
int
Ones(mask) /* HACKMEM 169 */
Mask mask;
{
register Mask y;
y = (mask >> 1) &033333333333;
y = mask - y - ((y >>1) & 033333333333);
return (((y + (y >> 3)) & 030707070707) % 077);
}
X11R4/src/mit/X11/X.h:
typedef unsigned long Mask;
--
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