MIPS arithmetic instructions (PATTERSON)
Instruction Example Meaning Comments
add add $1,$2,$3 $1 = $2 + $3 3 operands; exception possible
subtract sub $1,$2,$3 $1 = $2 – $3 3 operands; exception possible
add immediate addi $1,$2,100 $1 = $2 + 100 + constant; exception possible
add unsigned addu $1,$2,$3 $1 = $2 + $3 3 operands; no exceptions
subtract unsigned subu $1,$2,$3 $1 = $2 – $3 3 operands; no exceptions
add imm. unsign. addiu $1,$2,100 $1 = $2 + 100 + constant; no exceptions
multiply mult $2,$3 Hi, Lo = $2 x $3 64-bit signed product
multiply unsigned multu$2,$3 Hi, Lo = $2 x $3 64-bit unsigned product
divide div $2,$3 Lo = $2 ÷ $3, Lo = quotient, Hi = remainder
divide unsigned divu $2,$3 Lo = $2 ÷ $3, Unsigned quotient & remainder
Move from Hi mfhi $1 $1 = Hi Used to get copy of Hi
Move from Lo mflo $1 $1 = Lo Used to get copy of Lo