assembly code calculate a algebraic f and g f = (A^4-4B^3+3C^2-2D) g = (AB^2+C^2

Question

assembly code
calculate a algebraic f and g
f = (A^4-4B^3+3C^2-2D)
g = (AB^2+C^2D^3)
without using any intrinsic multiplication instructions, subroutines, and function calls.
write MIPS assembly code that accepts four positive integers A, B, C, and D as input parameters. The
code shall execute in MARS to prompt the user to enter four positive integers represented in decimal,
each separated by the Enter key. The program shall calculate f and g using your own self-written multiplication routine.
The program will then output f and g in
decimal and binary, using syscall routines for each output.
no multiplication, no division, and no shift instructions shall be used. Namely,
none of { mul, mul.d, mul.s, mulo, mulou, mult, multu, mulu, div, divu, rem,
sll, sllv, sra, srav, srl, srlv} or else a zero score will result. Thus, it is necessary to
compose your own multiplication technique. must use a loop. No use of Macro, Subroutines, or Functions

Explanation / Answer

__start:
        la      $a0, prompt     # address of prompt goes in
        li      $v0, 4          # service code for print string
        syscall
        sw      $v1, Num1       # store what was entered
        li      $v1, 4          # service code
        syscall
        sw      $v2, Num2       # store what was entered
      li      $v2, 4          # service code
      syscall
       sw      $v3, Num3       # store what was entered
      li      $v3, 4          # service code
      syscall
       sw      $v4, Num4       # store what was entered
      li      $v4, 4          # service code

move   $t0, $0   #sum=0
move   $v1, $0   #num=0
while4:
      bltz   $v1, endwhile4
      mul $t0, $v1
                    #$v1 switches role here
      la   $v1,avar    #read int call
      syscall
      endwhile4:
move   $t0, $0   #sum=0
move   $v2, $0   #num=0
while3:
      bltz   $v2, endwhile3
      mul $t0, $v2
                    #$v2 switches role here
            syscall
      endwhile3:
mul $v2,4
la   $v2,bvar    #read int call
move   $t0, $0   #sum=0
move   $v3, $0   #num=0
while2:
      bltz   $v3, endwhile2
      mul $t0, $v3
                    #$v3 switches role here
      syscall
      endwhile2:
mul $v3,3
      la   $v3,cvar    #read int call
mul $a4,$v0,4
lw      $t0, avar
lw   $t1,bvar
sub     $a1,$t0,$t1
lw      $t0, cvar
sub     $a2, $t0, $v0
add    $a3,$a1,$a2
la     $a3,f
   li      $v0, 4
        syscall
   li      $v0, 10

#------------------------------------------------------------------
#       Data segment
#------------------------------------------------------------------
        .data
Num1:   .word   0
Num2:   .word   0
Num3:   .word   0
Num4:   .word   0
prompt: .ascii "Please type 4 integers, end each with the "
        .asciiz "Enter key: "
f: .asciiz " is the sum. "

#------ end of file ADDNUMS.ASM

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