"IBM Mainframe Assembler List" <ASSEMBLER-LIST@LISTSERV.UGA.EDU> wrote on
01/19/2022 05:12:36 PM:
> Is register 2 considered volatile for the 64 bit high half?
>
> If not, then how do you know if the macro user will preserve and
> restore the register?
There is no macro, but I think I get your point. Although testing
seems to be going just fine at the moment, I guess I better investigate
how to save the caller's registers as 64-bit registers instead of just as
32-bit registers as I am doing now. Any hints to start my investigation
would be welcome. ;-)
Sincerely,
Dave Clark
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