Alternatively, consider the BRANCH INDIRECT ON CONDITION (BIC) instruction
(available on the z14). The second operand of BIC is an 8-byte location in
memory from which the branch address is fetched.
BIC was designed to assist Java in returning from a garbage collection
operation, where the return address is an 8-byte entry in the program stack,
and there isn't another register besides the stack pointer available.
However, if you can structure the program such that a branch table comprises
8-byte addresses in memory, BIC is useful, e.g.,
* R15 assumed to contain table index as a multiple of 8.
* To make Seymour happy, validate R15 if not a trusted value.
LARL 14,BR_TABLE
BI 0(14,15) BI is the extended mnemonic for BIC with mask of F.
...
BR_TABLE DC AD(CURLEY)
DC AD(MOE)
DC AD(LARRY)
