Correction to my "simple" code:
TM 0(R6),UEPPSB1
JO PSBFUNC
-----Original Message-----
From: IBM Mainframe Assembler List [mailto:[email protected]] On
Behalf Of Swarbrick, Frank
Sent: Tuesday, May 17, 2016 11:44 AM
To: [email protected]
Subject: Re: Structured Programming Macros
This is exactly true. That being said, I don't know how structured programming
macros can be used for 100% of your code if you want to also use the minimum
number of instructions possible. These two things appear to be in conflict.
For example, I did this simple code:
IF (TM,0(R6),UEPPSB1,O)
J PSBFUNC
ENDIF
Which generated this:
TM 0(R6),UEPPSB1
BRC 14,#@LB5
J PSBFUNC
+#@LB5 DC 0H
But without using the macros I'd simply do this:
TM 0(R6),UEPPSB1
JNO PSBFUNC
So it seems like there might be implied guidance to not use an IF macro if the
only conditional code is a branch. Or is there something I am missing? I know
there is DOEXIT, but that doesn't really fit in this case.
I should qualify that I know that I *could* do something like the following:
IF (TM,0(R6),UEPPSB1,O)
[lots of code here]
ELSE
[lots of code here]
ENDIF
I choose not to because I have a philosophy, for higher level languages anyway,
that if "conditional code" is more than a "few" lines it should be taken "out
of line" and invoked. For example, in COBOL, instead of
IF SOME-CONDITION
[50 lines of code goes here]
ELSE
[30 lines of code goes here]
ENDIF
I would do this:
IF SOME-CONDITION
PERFORM 50-LINES-OF-CODE
ELSE
PERFORM 30-LINES-OF-CODE
ENDIF
The compiler, of course, is free to bring the "performed" code inline. And, of
course, an assembler will not do that.
I have only been using the SP macros for a total of three days, so if I am
missing a possibility please let me know!
Frank
-----Original Message-----
From: IBM Mainframe Assembler List [mailto:[email protected]] On
Behalf Of Willy Jensen
Sent: Friday, May 13, 2016 10:21 AM
To: [email protected]
Subject: Re: Structured Programming Macros
Maybe for consistency ?
I've been using structured macro for a long time and I don't think that you'll
ever get rid of 'old style' code. But it still easier to read if as much as
possible is using IFs and DOs. At least I find it so.
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