On 2020-06-02, at 14:01:28, MELVYN MALTZ wrote: > > Labels... > Even back in the 60's I was taught never to put a label on an instruction > I only break that rule now for the subject of an EX (and its variants) > It's safer than label EQU *
> Returning CC from a subroutine... > Have to point out that IBM do this in the VSAM TESTCB macro > I had one co-worker who insisted on doing that. He augmented our MVS/XA common return macro to: IPM ... SH R13,=Y(workarea_length) ... SPM , restore CC then *I* was tasked with porting to VM/370. No IPM. I did: LH R1,=Y(-workarea_length) LA R13,0(R1,R13) I had a tough time in code review. Reviewers called me naive for using a negative value in a base register. No, the were ignorant; the code worked and was correct. -- gil