JUMPR Instruction Property 2

When the jump-register (JUMPR) instruction executes, memory cell values stay the same. More formally:

if the following are true:

  • instruction #i is jumpr addr=addr
  • the PC at time t = i

then value of cell x at time (t + 1) = value of cell x at time t

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

Initially, the PC is 0, so instruction #0 is executed. Instruction #0 is a JUMPR instruction. After execution is completed, note that the memory cell values remain unchanged.

if the following are true:

  • instruction #0 is jumpr addr=1
  • the PC at time 0 = 0

then value of cell x at time (0 + 1) = value of cell x at time 0


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