Translate the high-level code below into MIPS assembly. You can assume that $s0

Question

Translate the high-level code below into MIPS assembly. You can assume that $s0 holds the value of x and $s1 holds the value of y. int x, y; x = 0 ; while (x > 4; x = x + 2;} Translate the high-level code below into MIPS assembly. Assume that $t1 holds the value of var and $t2 holds the value of i. Assume that you must store the value of i to address 0x2000A000 at the end of this code. char i ; int var; switch (var) {case 0 : i++; break; case 1: i--; break; case 2: i = 0x12345678; break; default: i = 0;}

Explanation / Answer

(1)

$t0 is the constant 30
$t1 is the counter variable i.e. x
$t2 is y

   li $t0, 30 # t0 is a constant 30
   li $t1, 0 # t1 is our counter (i)
   loop:
   beq $t1, $t0, end # if t1 == 30 we are done
   srl $t2 $t1 4 # shift x 4 places to right and store the result in y.
   addi $t1, $t1, 2 # add 1 to t1
   j loop # jump back to the top
   end:

(2)

.data
   array .space 80               # this array is stored at address 0x12345678
  
   lw $t2, 0($i)
   lw $t1, 0($var)
  
   bltz $t1, default
   slti $t3, $t1, $zero # i<3?
   bne $t3, $zero, Exit           # if i< 0 then exit
   slti $t3, $t1, 3           # check if i<3
   beq $t3, $zero, Exit           # if i >= 3 then exit
  
   add $t4, $t1, $t1           # $t4 = 2*i
   add $t4, $t4, $t4           # $t4 = 4*i
   add $t4, $t4, $t5            # $t5 = address of JumpTable

   lw $t0, 0($t1)                # $to = JumpTable[k]
                               # The branch table is initialized to hold in successive locations
                               the absolute addresses of the instructions at labels is0, is1, and is2.
   jr $t0
  
is0: addi $t2, $t2, 1           # i++
   j done
     
is1: addiu $t2, $t2, -1           # i--
   j done
     
is2: // to load address depends on MIPS32 or MIPS64 you are using.
   j done

def : xor $t2, $t2, $t2       # xor the contents of $t2 to make it zero.
   j done
  
done:

Again to store address 0x2000A000 in i, it depends on MIPS32 or MIPS64

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