a) sub $s0, $s0, $s1 sub $s0, $s0, $s3 add $s0, $s0, $s1 b) addi $t0, $s6, 4 add

Question

a) sub $s0, $s0, $s1
sub $s0, $s0, $s3
add $s0, $s0, $s1

b) addi $t0, $s6, 4
add $t1, $s6, $0
sw $t1, 0($t0)
lw $t0, 0($t0)
add $s0, $t1, $t0

For the MIPS assembly above, assume that the registers $s0, $s1, $s2, and $s3 contain the values 0x0000000a, 0x00000014, 0x0000001e, and 0x00000028, respectively. Also, assume that register $s6 contains the value 0x00000100, and that memory contains the following values:

Address    Value
0x00000100 0x00000064
0x00000104 0x000000c8
0x00000108 0x0000012c

Find the value of $s0 at the end of the assembly code.

Explanation / Answer

Consider the MIPS program :

a) sub $s0, $s0, $s1
sub $s0, $s0, $s3
add $s0, $s0, $s1

The value of $s0 in the program at each step is given as,

$s0 = FFFFFFF6

$s0 = FFFFFFCE

$s0 = FFFFFFE2

Therefore the value of $s0 is   $s0 = FFFFFFE2

Consider the MIPS program :

b) addi $t0, $s6, 4
add $t1, $s6, $0
sw $t1, 0($t0)
lw $t0, 0($t0)
add $s0, $t1, $t0

The value of $s0 in the program at each step is given as,

addi $t0, $s6, 4 # $t0 = 104

add $t1, $s6, $0 # $t1 = 100

sw $t1, 0($t0)

lw $t0, 0($t0) # $t0 = 100

add $s0, $t1, $t0 # $s0 = 100+100

therefore $s0 is equal to $s0=200

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