"IBM Mainframe Assembler List" <ASSEMBLER-LIST@LISTSERV.UGA.EDU> wrote on
04/01/2022 03:32:42 PM:
> Just go for it! Relative branches are 100% goodness, the best thing in
> assembler since ICM. Easy as pi.
>
> Find a B opcode and replace it with a J. Find a BE opcode and replace it
> with a JE. Convince yourself of how easy this is going to be, and then
just
> do it.
>
> Only classic B SOMELABEL branches. J does not replace branch table
branches
> like B 4(R1,R15) or B FOOBAR(R2).
I generally don't use the last two forms of branching so I am good
from that standpoint. My recent project (external assembler REXX function
for VSAM I/O) is what got me thinking more seriously about eliminating the
need for code base registers. The main routine links three base registers
to cover the code and trailing constants -- in spite of splitting out to
four other external subroutines to get everything done. Losing the more
general use of three registers really hurt. ;-)
Sincerely,
Dave Clark
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