I've used the CC bits but never the ILC bits.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on behalf of John Gateley <jrg.spur...@outlook.com> Sent: Tuesday, January 22, 2019 7:43 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: BALR and BAL in AMODE=24 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 lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
