At 07:57 -0400 on 06/05/2012, Tom Marchant wrote about Re: Base registers:
Yuck. By adding a few LOCTR instructions, all of the data can be grouped at
the beginning of the program. If relative branches are used in the code,
the base register is needed only for data and literals.
MYCSECT CSECT
USING *,R15
J BYID
DATA LOCTR
ID DC C'module-name'
BASES DC A(MYCSECT)
DC A(MYCSECT+4096)
DC A(MYCSECT+2*4096)
DC A(MYCSECT+3*4096)
BYID DS 0H
CODE LOCTR
LM R9,R12,BASES
DROP R15
USING MYCSECT,R9,R10,R11,R12
...
DATA LOCTR
* additional DC statements are coded here
LTORG
You can probably do with only one base register for the data.
That BYID needs to be placed after the CODE LOCTR or you will be
jumping into your DATA area and a DC or the LTORG.
