"IBM Mainframe Assembler List" <[email protected]> wrote on
11/09/2023 11:27:20 AM:
> IMHO, relative branch use is a "best practice" in all situations. I
> *never* use a based branch if an equivalent relative branch will
suffice...
I've been coding based-branches since 1980 and never moved on to
the new stuff. But I recognize that it would be beneficial if I did. So,
let me ask a couple of simple questions...
Is it, relatively speaking (hehe), "a lot" of effort (or even
possible/practical) to do away with a code base register altogether? The
first place that I would like to switch to relative jumps is in my
structured programming macro sets. But do relative jumps come in more
than one flavor? ...like long jumps and "how far"?
I know I can do a relative jump up to 4K, correct? Is there a
long jump beyond that? And since there can be as much code between the
macros in my macro sets as the user determines to put in there, should I
use long jumps as opposed to "short" jumps, just-in-case?
For example... I have these 4 macros in one of my sets.
Internally, I generate labels for THENnnnn, ELSEnnnn, and ENDFnnnn. These
also arbitrarily allow nesting up to 8 levels.
IF condition,AND/OR,condition
AND condition,AND,condition
... as much code as the user desires between here ...
ELSE
... as much code as the user desires between here ...
ENDIF
Sincerely,
Dave Clark
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