I would use the first method, because it is more understandable for users* that
don't have deep knowledge of both HLASM syntax and what the base field name is
in the DSECTs.
* like myself
-----Original Message-----
From: IBM Mainframe Assembler List <ASSEMBLER-LIST@LISTSERV.UGA.EDU> On Behalf
Of Phil Smith III
Sent: Thursday, June 1, 2023 11:24 AM
To: ASSEMBLER-LIST@LISTSERV.UGA.EDU
Subject: Assembler theology question
We've all seen (and written!) code like this:
USING PSA,R9
L R10,PSATOLD Get current TCB
DROP R9
USING TCB,R10
L R9,TCBJSCB Get JSCB
DROP R10
I've also seen (and probably written) the equivalent:
L R10,PSATOLD-PSA(,R9) Get current TCB
L R9,TCBJSCB-TCB(,R1) Get JSCB
I like the latter because it's tighter to read, reduces the USING map, keeps
you out of trouble if you decide to use R9 or R10 for something global, etc.
But I can also see a theological argument that you really *are* using (USING?)
the control block.
Thoughts? (Yes, I *said* it was theology, so I'm prepared for religious
arguments!)
