Yes. I have worked on application programs that interrogated the high order byte to determine what logic path to take in the called routine.
In certain other cases it was used after return to the caller to look at the cc from before the BAL/BALR and branch accordingly. Sent from my iPhone — small keyboarf, fat fungrs, stupd spell manglr. Expct mistaks > On Jan 22, 2019, at 7:43 AM, John Gateley <[email protected]> wrote: > > Hello. > > The link information in the 24-bit addressing mode consists of the > instruction-length code (ILC), the condition code (CC), the program-mask > bits, and the rightmost 24 bits of the updated instruction address. > > I have never given much thought to the high byte when using this instruction > and switched to BASR and BAS years ago. > > Just for personal interest, does anyone recall a program using the contents > of the link register other than as a return address? > > Thanks for any replies. > John > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
