[MI400] CPYBREP issue

["James H H Lampert" <jamesl@xxxxxxxxxxx>]

Can somebody explain why it is that a CPYBREP instruction, exactly
following the syntax given in both the V2R3 and V4R4 MI books, can crash
QPRCRTPG?

Or why the MI books say it can be used with substrings, and yet a PDF by
Leif, that I uncovered with a Google search, says it can't?

The exact "problem" instruction is
                  CPYBREP BUFASTR(.IRF:.I), X'0020';
With the instruction commented out, compilation is nominal. But un-comment
it, and the compilation listing goes into "dump" mode, the same as if I'd
done a relative branch without marking the target.

Or can anybody suggest an easy alternate way to initialize a substring of
a large buffer to Unicode spaces?

--
JHHL