MIPS arithmetic instructions
| 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,
Hi = $2 mod $3 |
Lo = quotient, Hi = remainder |
| divide unsigned |
divu $2,$3 |
Lo = $2 ÷ $3,
Hi = $2 mod $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 |
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