Also the linkage stack is not supported by Language Environment, so you should not be using it in any code that can be called in an LE run-unit.
-----Original Message----- From: IBM Mainframe Assembler List <ASSEMBLER-LIST@LISTSERV.UGA.EDU> On Behalf Of Farley, Peter x23353 Sent: Friday, January 21, 2022 5:39 PM To: ASSEMBLER-LIST@LISTSERV.UGA.EDU Subject: Re: Saving Caller's 64-bit Regsiters Dave, if speed is an issue (i.e., your small routine is called many, many times), BAKR is **SLOW** even on very recent hardware. It is convenient, but normal save/restore processes beat the pants off BAKR if execution time is critical. Considering also the traceability issue and the task cancel issue Tony references, I don't think I would go that way. I have only been in MVS/OS390/zOS shops where it is better supported since the mid-1990's, and I have yet to find any reasonable case for using BAKR/PR in any *application-level* code. HTH Peter
