$4$ MIPS: Understand MIPS Code $[18$ pts$]$

An array of integers S is defined in the following code. Try to understand the code

and answer the following questions.

S: $.$word $14,-29,18,30,-12,12,106,-7$

la $$a0,S$# load address of $S$ into $$a0$; suppose $$a0=020060000$

addi $$a1,$$$a0,28$

move $$v0,$$$a0$ #move the value of $$a0$ into $$v0$

$1w$$$v1,0($$$v0)$

move $$t0,$$$a0$

loop: addi $$t0,$$$t0,4$

$1w$$$t1,0($$$t0)$

ble $t$1,$ $v$1,$ skip # go to skip if $$t1$$$v1$

move $$v0,$ $$t0$

move $$v1,$ $$t1$

skip: bne $$t0,$$$a1,$ loop

$(1)$ What flow$-$control statement does ble $t$1,$ $v$1$ implement? $[1$ pts$]$

$(2)$ To show that you fully understand the function of this program, briefly explain the usage

of the following $4$ registers in the program. That is$,$ what are these registers used for in

the program. For example, for register $$a1,$ it stores the address of the last element of

array, indicating the end of array. pts$]$

Registers: $$t0,$$$t1,$$$v0,$$$v1$

$(3)$ Briefly explain the usage of the two instructions move $v$0,$ $t$0$; move $v$1,$ $t$1.[4$

pts$]$

$(4)$ Briefly explain the usage of the instruction bne $t$0,$ $a$1,$ loop. $[2$ pts$]$

$(5)$ Briefly explain the function of this program, suppose the desired outputs of the program

are the contents of the registers $$v0$ and $$v1.[3$ pts$]$

$(6)$ Determine the contents of the registers $v$0$ and $v$1$ after executing the code. $[4$ pts$]$