There should be no performance cost, other than the cost of the instructions to manipulate the access registers, as long as an access register is loaded far enough in advance of its use to avoid a pipeline delay, and for an ALET other than 0 or 1, there is already an ALB entry, so that Access Register Translation is avoided.
Jim Mulder z/OS Diagnosis, Design, Development, Test IBM Corp. Poughkeepsie NY > How big is the performance cost of running ARMODE? > > Should there be a section of code that uses only ALET 0, is it best to go into > primary mode for that section? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
