Prefixing is absolutely* irrelevant to this discussion, and to 99.99% of assembler programmers for their entire lives. It's well-documented if you're interested, but you probably aren't. Any discussion here is very likely to be spurious, specious, and superficial.
*I guess it's "really" irrelevant too. :-) sas On Wed, Nov 6, 2019 at 1:30 PM Seymour J Metz <sme...@gmu.edu> wrote: > The contents of R0 is irrelevant to forming the effective address of an RS > or RX instruction. the contents of the prefix register are only relevant > for real addresses. > > Now,, if you're running DAT off and you use an instruction that takes an > address from a register, e.g., MVCL, then it is subject to prefixing. But > even there it's in terms of the storage assigned to the LPAR. >
