On 3/4/2022 9:01 AM, Dave Clark wrote:
So, I looked at the original email again and did some research
into the LAY instruction. That is when I read about the Long Displacement
Facility (LDF) having to be installed for this instruction to work
(otherwise: operation exception). So, other than just trying it, how
would I determine if the box we are on (2818) has the LDF? Further, if
developing software for distribution, is it best to avoid using the
"newer," fancier instructions and just stick with the more traditional
approaches?
Every IBM Z box ever produced has the long-displacement facility. The
original z900 (2064) from 1999 got it as an RPQ at GA2 and thus it is
implemented via millicode. Every other box (z800, z900 GA2, and beyond)
has had this feature standard. There is no reasonable rationale for not
using this 22 year-old facility.
--
Phoenix Software International
Edward E. Jaffe
831 Parkview Drive North
El Segundo, CA 90245
https://www.phoenixsoftware.com/
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