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From: rsalz@bbn.com (Rich Salz)
Newsgroups: comp.lang.c
Subject: Re: count of bits set in a long
Message-ID: <2859@litchi.bbn.com>
Date: 26 Sep 90 20:55:58 GMT
References: <37545@ut-emx.uucp> <3820@goanna.cs.rmit.oz.au> <34281@cup.portal.com>
Organization: BBN Systems and Technology, Inc.
Lines: 18


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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