Class notes
CS-Register Instruction
- Course
- Cs 210
- Institution
- University Of Regina ( )
Register instruction for computer arithmetic
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Arithmetic Machinecode
Addition add $s0, $s1, $s2 $s0 = $s1 + $s2 100000 1
addu $s0, $s1, $s2 $s0 = $s1 + $s2 (always 100001 2
positive)
addi $s0, $s1, 5 $s0 = $s1 + 5 001000 3
addiu $s0, $s1, $s0 = $s1 + 20 (always 001001 4
20; positive)
Subtraction sub $s0, $s1, $s2 $s0 = $s1 - $s2 100010 5
subu $s0, $s1, $s2 $s0 = $s1 - $s2 (always 100011 6
positive)
Multiplication mult $s0, $s1 -$s0 * $s1 -There are two 011000 7
-produces a 64 bits special memory spots
value. Lower 32 bits HIGH and LOW.
are stored in LOW and -mfhi $v0 stores the
upper 32 bits are HIGH value in $v0
stored in HIGH. -mflo $v1 stores the
LOW value in $v1
Multu $s0, $s1 $s0 * $s1 (always 011001 8
positive)
Division div $s0, $s1 -$s0 / $s1 011010 9
-result is stored in LOW
-remainder is stored in
HIGH
divu $s0 / $s1 (always 011011 10
positive)
Logical
And and $s0, $s1, $s2 $s0 = $s1 AND $s2 100100 11
andi $s0, $s1, 25 $s0 = $s1 AND 25 001100 12
OR or $s0, $s1, $s2 $s0 = $s1 OR $s2 100101 13
ori $s0, $s1, 25 $s0 = $s1 OR 25 001101 14
NOR nor $s0, $s1, $s2 $s0 = $s1 NOR $s2 100111 15
XOR xor $s0, $s1, $s2 $s0 = $s1 XOR $s2 100110 16
xori $s0, $s1, 25 $s0 = $s1 XOR 25 001110 17
Shifting
Shift left sllv $s0, $s1, $s2 -shift $s2 number of 000100 18
logical bits to the left of $s1
and store in $s0
sll $s0, $s1, 5 -shift 5 number of bits 000000 19
to the left of $s1 and
store in $s0
Shift right srlv $s0, $s1, $s2 -shift $s2 number of 000110 20
logical bits to the right of $s1
and store in $s0
srl $s0, $s1, 5 -shift 5 number of bits 000010 21
to the right of $s1 and
store in $s0
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