On 11/9/2023 4:06 AM, Seymour J Metz wrote:
The relative instructions are invaluable for large csects, but in this case I
believe that they are overkill. All he needs is the judicious placement of DROP.
OTOH, they are definitely instructions worth his time to learn.
In addition to extending the practical size of a code segment and
potentially making additional general-purpose registers available,
relative branches are also better understood/optimized by the
branch-prediction circuitry in the hardware since there is no question
what the final branch target address will be. Furthermore, relative
branches avoid the AGI suffered by based branches that occurs every time
a code base register is loaded (or re-loaded).
IMHO, relative branch use is a "best practice" in all situations. I
*never* use a based branch if an equivalent relative branch will suffice...
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