It could be shorter, and B BRTAB(R15) is not baseless. How about
CIJL R15,0,RC_MINUS
CIJH R15,MAXRC,RC_GT_MAX
LARL R14,BRTAN
B 0(R14,R15)
How does the performance compare using BCTR R14,0 rather than the LARL? It's
shorter, but is a suppressed branch.
--
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~smetz3
________________________________________
From: IBM Mainframe Assembler List [ASSEMBLER-LIST@LISTSERV.UGA.EDU] on behalf
of Jeremy Schwartz [0000115e2ee20c83-dmarc-requ...@listserv.uga.edu]
Sent: Wednesday, November 24, 2021 8:44 PM
To: ASSEMBLER-LIST@LISTSERV.UGA.EDU
Subject: Re: Base-less macros
Here's another form of branch table combining compare and branches. Just
thought it was interesting and one reason why I love assembler. So many
possibilities.
XR R0,R0 INCREMENT = 0
LR R1,R0
BCTR R1,0 SET COMPARE = -1
JXLE R15,R0,LBL_RC_MINUS Label taken if <= -1
LA R1,MAX_RC SET COMPARE = MAX_RC
JXH R15,R0,LBL_RC_GT_MAX Label taken if > MAX_RC
B BRTAB(R15)
BRTAB DS 0H
J LABEL_RC0
J LABEL_RC4
J LABEL_RC8
J LABEL_RC12
