Computer Language : Arithmetic Operation

Arithmetic Operation

·         Arithmetic operations are performed on 32-bits numbers held in the general purpose registers (32-bit each)

·         Two types of instruction are included in this operation :

1.      Signed arithmetic : may generate an overflow

2.      Unsigned arithmetic : never generate an overflow

Category	Instruction	Example	Meaning
Arithmetic	add	add $1,$2,$3	$1 = $2 + $3
	add immediate	addi $1,$2,100	$1 = $2 + 100
	add unsigned	addu $1,$2,$3	$1 = $2 + $3
	add immediate unsigned	addi $1,$2,100	$1 = $2 + 100
	subtract	sub $1,$2,$3	$1 = $2 - $3
	subtract unsigned	subi $1,$2,$3	$1 = $2 - $3
	multiplication	mult $1,$2  mflo $3	$1*$2 quotient store in $3
	division	div $1,$2 mflo $3 mfhi $4	$1/$2 quotient store in $3 remainder store in $4

Example :

a.)    f = (g + h) - (i + j);                        #Assume f, g, h, i, j uses $s0, .. $s4

add $s0,$s1,$s2       # f = g + h

add $t0,$s3,$s4       # t0 = i + j

sub $s0,$s0,$t0       # f=(g+h)-(i+j)

b.)    a = c/d

a = c%d                                    #Assume a,b,c,d uses $s0…..$s4

div     $s2, $s3             # lo=c/d , hi=c%d

mflo  $s0                     #store quotient in $s0

mfhi  $s1                     #store remainder in $s1

By : Chong Lee Man   B031210367