Re: Is there a cost in switching AMODEs?

Binyamin Dissen wrote:
:>In my experience, excessive switching of addressing mode is quite :>expensive. I suspect it's because the entire pipeline must be flushed.

I didn't see that in the POPs.

AFAIK, the Principles of Operation does not discuss processor pipeline considerations for any instruction. There is some cursory information here and there regarding instruction prefetch. That's about it.

--
Edward E Jaffe
Phoenix Software International, Inc
5200 W Century Blvd, Suite 800
Los Angeles, CA 90045
310-338-0400 x318
edjaffe@xxxxxxxxxxxxxxxxxxx
http://www.phoenixsoftware.com/

----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to listserv@xxxxxxxxxxx with the message: GET IBM-MAIN INFO
Search the archives at http://bama.ua.edu/archives/ibm-main.html
.

Relevant Pages

  • Re: JES2 Exit6 - Changing Class= Based on PGM=
    ... instruction offset,offset. ... To compare 1 byte, you would ... For IBM-MAIN subscribe / signoff / archive access instructions, ... send email to listserv@xxxxxxxxxxx with the message: GET IBM-MAIN INFO ...
    (bit.listserv.ibm-main)
  • RE: Highly used programs: any better replacements out there?
    ... Behalf Of Bill Fairchild ... *specic* instruction could not have been written instead as an LA r,5. ... For IBM-MAIN subscribe / signoff / archive access instructions, ... send email to listserv@xxxxxxxxxxx with the message: GET IBM-MAIN INFO ...
    (bit.listserv.ibm-main)
  • Re: CPU time differences for the same job
    ... Yet another undocumented System z instruction? ... For IBM-MAIN subscribe / signoff / archive access instructions, ... send email to listserv@xxxxxxxxxxx with the message: GET IBM-MAIN INFO ...
    (bit.listserv.ibm-main)
  • RE: Highly used programs: any better replacements out there?
    ... I.e. the literal pool ... may be in a separate page from the instruction and that page may not be ... For IBM-MAIN subscribe / signoff / archive access instructions, ... send email to listserv@xxxxxxxxxxx with the message: GET IBM-MAIN INFO ...
    (bit.listserv.ibm-main)
  • Re: Need help with Assembler accessing VSAM file in reentrant LE-conforming program
    ... Post the register and psw and from the instruction the offset to the relevant register ... For IBM-MAIN subscribe / signoff / archive access instructions, ... send email to listserv@xxxxxxxxxxx with the message: GET IBM-MAIN INFO ...
    (bit.listserv.ibm-main)