JUMP Instruction Property

The jump (JUMP) instruction tells the computer to jump to an arbitrary instruction number. This is done by updating the Program Counter (PC). More formally:

if the following are true:

  • instruction #i is jump imm=jump_to
  • the PC at time t = i

then the PC at time (t + 1) = jump_to

Here is an example where instruction #0 is a JUMP instruction:
Instructions
Memory Cells
Program Counter Time
0 0
LW Computer Simulator

Initially, the PC is 0, so instruction #0 is executed. In the JUMP instruction, imm is 2, which means that, after the JUMP instruction is executed, the PC should be set to 2. Thus, after the JUMP instruction, instruction #1 is skipped, and instruction #2, an ADDI instruction, is executed next. In other words:

if the following are true:

  • instruction #0 is jump imm=2
  • the PC at time 0 = 0

then the PC at time (0 + 1) = 2


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