BAL was pretty much obsolete when IPM came into existance. Unless of course your code had to run on an old box. I have not come across an instance yet when I needed BAL, and often use OPSYN to map BAL/R to BAS/R. If I REALLY need BAL/R, I'll code a DC X'45' or DC X'05' and add a comment saying I really, really need BAL/R here...
I would also opt for the immiediate-type instructions instead of referencing separate storage locations... i.e. LHI R5,L'BUFFER or LHI R6,-2 They're faster because they don't require additional memory fetches... and they're "nicer" because if you look at a dump or object code, you can see the operand right in the instruction. In many cases their use eliminates literals. I favor the branch-relative instructions (Jxxx mnemonics) where possible to reduce base register needs (sometimes) and, I suppose they're faster because they simply add the displacement to the currect PSW without all that adding, checking if index or base reg are zero etc. Don On Fri, Feb 6, 2009 at 9:43 AM, Ward, Mike S <mw...@ssfcu.org> wrote: > Hello, all I have a question. I was just looking through the principle > of ops guide on an instruction I had a question on and noticed a BAS > instruction. I started reading about it and noticed that it said we > should use the BAS, BASR type of instructions instead of the BAL and > BALR types. I won't bore you with the details. My question is: Is there > a list of recommended instructions that we should be using instead of > the old instructions we had been using? > > ========================== > This email and any files transmitted with it are confidential and intended > solely for the use of the individual or entity > to which they are addressed. If you have received this email in error > please notify the system manager. This message > contains confidential information and is intended only for the individual > named. If you are not the named addressee you > should not disseminate, distribute or copy this e-mail. Please notify the > sender immediately by e-mail if you > have received this e-mail by mistake and delete this e-mail from your > system. If you are not the intended recipient > you are notified that disclosing, copying, distributing or taking any > action in reliance on the contents of this > information is strictly prohibited. > > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO > Search the archives at http://bama.ua.edu/archives/ibm-main.html > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
