Answer:
No. An ordinary jump instruction has its one jump
target encoded as an unchanging part of the instruction.
(like j someSpot).
No. An ordinary jump instruction has its one jump
target encoded as an unchanging part of the instruction.
(like j someSpot).
jr Instruction
T he
jr
instruction returns control to
the caller.
It copies the contents of $ra into the PC:
jr $ra # PC <― $ra
# A branch delay
# slot follows this instruction.
Usually you think of this as "jumping
to the address in $ra."
To make the instruction more general, it can be
used with any register, not just $ra.
Like all jump and branch instructions,
the jr instruction is
followed by a branch delay.
The diagram shows the subroutine returning
to the return address that was loaded into $ra
by the jal instruction in the caller.
Do we now have a mechanism that enables us to call the same subroutine from many points in a program?