It is extremely useful! In addition to what Charles stated, this
characteristic of the EXECUTE instruction permits, for example,
having a set of linkage type instructions (BRAS, BAS, and similar
instructions) which could be the targets of an indexed EXECUTE
instruction ("Branch Tables" of which some folks are fond). In
this scenario, the "return address" value is the location
immediately following the EXECUTE instruction, not the location
immediately following the EXECUTEd linkage instruction.
| How useful is that?
|
| --
| gil
