I see a lot of code with computed offsets from before the SLAC mods (thanks, Greg and John), and later by people infamiliar with labeled USING; I find it harder to read.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Assembler List [ASSEMBLER-LIST@LISTSERV.UGA.EDU] on behalf of Charles Mills [charl...@mcn.org] Sent: Wednesday, March 29, 2023 11:21 PM To: ASSEMBLER-LIST@LISTSERV.UGA.EDU Subject: Re: alternative to USAGE statement? An alternative to the USING statement? The only difference is in the source code. The executable machine code is the same. The question is what is clearest to you? My personal rule is that for one or perhaps two references, AFLENG-DFHACB(,R12) is simpler and cleaner, and for more references than that, you should definitely code a USING/DROP pair. But every coder's mileage may vary. The latter I would call USING/DROP; I don't have a name for the former. Perhaps "computed offset"? Charles -----Original Message----- From: IBM Mainframe Assembler List [mailto:ASSEMBLER-LIST@LISTSERV.UGA.EDU] On Behalf Of Swarbrick, Frank Sent: Wednesday, March 29, 2023 5:16 PM To: ASSEMBLER-LIST@LISTSERV.UGA.EDU Subject: alternative to USAGE statement? 20 year amateur assembler programmer here. Sometimes I see macro expansions (and just open code) with code like the following. L 12,X'14'(,12) AH 12,AFLENG-DFHAFCB(,12) L 12,AFPFXLEN+AFTKTCB-AFTSTART(,12) LLGT 12,UKTCB_ACTIVE_TASK-DFHUKTCB(,12) LLGT 12,UTATCAA-DFHUTASN(,12) Is that code equal to this? L 12,X'14'(,12) USING DFHAFCB,12 AH 12,AFLENG USING AFTSTART,12 L 12,AFPFXLEN+AFTKTCB USING DFHUKTCB LLGT 12,UKTCB_ACTIVE_TASK USING DFHUTASN LLGT 12,UTATCAA(,12) What is the "name" of this usage? The information contained in this electronic communication and any document attached hereto or transmitted herewith is confidential and intended for the exclusive use of the individual or entity named above. If the reader of this message is not the intended recipient or the employee or agent responsible for delivering it to the intended recipient, you are hereby notified that any examination, use, dissemination, distribution or copying of this communication or any part thereof is strictly prohibited. If you have received this communication in error, please immediately notify the sender by reply e-mail and destroy this communication. Thank you.
