On Wed, Feb 19, 2014 at 8:47 AM, DASDBILL2 <[email protected]> wrote:
> From: "John McKown" <[email protected]> > To: [email protected] > Sent: Wednesday, February 19, 2014 7:20:20 AM > Subject: Re: assembler > > >They have done some, such as with Find LeftMost One and > Population Count (could somebody explain to me what this might really be > used for?). > > One possible use of Population Count is in building any kind of DASD > Locate Record Extended CCW that involves reading or writing a track set > which is defined by a bit map which is either one or two bytes long, refers > to the 16 consecutive tracks after the LRE's domain beginning point has > been established, can contain any number of one bits, and the total number > of one bits must be copied into the one-byte record count field in the > LRE's basic parameters. > > Bill Fairchild > Nolensville, TN > > Thanks Bill. That helps explain why _I_ couldn't think of any use. I don't do CCW level programming. -- Wasn't there something about a PASCAL programmer knowing the value of everything and the Wirth of nothing? Maranatha! <>< John McKown ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
