On 6/1/23 12:24, Phil Smith III wrote:
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!)
I like the latter.
Now if I can just remember it!
-- R; <><
