1 myfunc: 2 # Prologue (code for save registers are hidden) 3 4 # assign registers to hold arguments to myfunc 5 addi to, a0, 0 6 addi so, al, 0 7 addi a7, a2, 0 8 9 jal generate_random #code for saving/restoring regs are hidden 10 11 # store and process return value 12 addi tl, a0, 0 slli t5, t1, 2 13 14 15 # setup arguments for reverse 16 add a0, to, x0 add al, 50, x0 add a2, t5, x0 addi a3, t1, 0 20 add a7, t5, a7 21 22 jal reverse #code for saving/restoring regs are hidden 23 24 # additional 17 18 19 25 add to, s0, x0 add t1, tl, a7 26 27 add s9, 58, t1 28 add s3, x0, t5 29 30 exit: # Epilogue (code for restoring registers are hidden) 31 ret The lifetime of register t1 is between lines 12 27 Question 2 6 The lifetime of register so is between line line 17 and 0.2 pts and Question 3 What callee-saved registers must be saved on the stack in the prologue of myfunc? U U U U U U U U U U SO a7 s8 $9 t1 to a3 s3 t5 a1 a0 Oa2 0.3 pts Question 4 What caller-saved registers must be saved on the stack before calling reverse? J U L D U 1 U U J a3 a2 SO a0 8 t5 a1 s9 a7 t1 ra to 0.3 pts s3 1 myfunc: 2 # Prologue (code for save registers are hidden) 3 4 # assign registers to hold arguments to myfunc 5 addi to, a0, 0 6 addi se, al, 0 7 addi a7, a2, 0 8 9 jal generate_random #code for saving/restoring regs are hidden 10 11 # store and process return value 12 addi tl, a0, 0 slli t5, t1, 2 13 14 15 # setup arguments for reverse 16 add a0, to, x0 add al, 50, x0 add a2, t5, x0 addi a3, t1, 0 20 add a7, t5, a7 21 22 jal reverse #code for saving/restoring regs are hidden 23 24 # additional 17 18 19 25 add to, s0, x0 add t1, tl, a7 26 27 add s9, 58, t1 28 add s3, x0, t5 29 30 exit: # Epilogue (code for restoring registers are hidden) 31 ret The lifetime of register t1 is between lines 12 27 Question 2 6 The lifetime of register so is between line line 17 and 0.2 pts and Question 3 What callee-saved registers must be saved on the stack in the prologue of myfunc? U U U U U U U U U U SO a7 s8 $9 t1 to a3 s3 t5 a1 a0 Oa2 0.3 pts Question 4 What caller-saved registers must be saved on the stack before calling reverse? J U L D U 1 U U J a3 a2 SO a0 8 t5 a1 s9 a7 t1 ra to 0.3 pts s3