I believe that in the 360+ architecture universe, "logical" means "unsigned."
Charles -----Original Message----- From: IBM Mainframe Assembler List [mailto:[email protected]] On Behalf Of Phil Smith III Sent: Wednesday, June 7, 2023 10:22 AM To: [email protected] Subject: Shower thought I was thinking about assembler today in the shower, as one does, and the L in instructions like CLC and CLI started bothering me: what's with the "Logical"? At first I thought "Hmm, I guessh it gives a logical answer-yes/no" but then realized that of course it doesn't: it's a real comparison, so CLI <value>,1 will give different CCs if <value> is 0 or 2. So where does this "Logical" come from? I'm sure it's something obvious! ...phsiii P.S. The way I got to that is the usual twisted path: I was thinking about something I have to hunt down in Outlook, and that I can't remember all of one of the search terms (it's a model number), but that Outlook search matches what you specify, so if I know the model starts with XYZ, then I can search that and it will match XYZABC. Which led me to thinking about almost exactly 43 years ago, when my then-mentor (dead for about forty of those years, alas) taught me how to use EXecute with CLC to do this in assembler.
