| Pseudoinstruction | Example Use | Equivalence |
|---|---|---|
Load Immediate |
li $t0, 42 |
ori $t0, $0, 42 # or addi $t0, $0, 42 |
Move |
move $t0, $t1 |
or $t0, $0, $t1 # or add $t0, $0, $t1 |
No Operation |
nop |
# anything with $0 as dest # reg will work, I prefer or $0, $0, $0 |
Load Address |
la $t0, label |
# use 0x1001 for MARS lui $t0, 0x1000 ori $t0, $t0, byte_offset |
Branch Less Than |
blt $t0, $t1, label |
# t2 = t0 < t1 slt $t2, $t0, $t1 bne $t2, $0, label # or if you're counting up and # you know they'll be equal, # you can simplify to bne $t0, $t1, label |
Branch Greater Than |
bgt $t0, $t1, label |
# flip order to get > slt $t2, $t1, $t0 bne $t2, $0, label |
Branch Less Than or Equal |
ble $t0, $t1, label |
# test for < and = separately slt $t2, $t0, $t1 bne $t2, $0, label beq $t0, $t1, label # or add 1 to change <= to < # use a spare reg if you need # to preserve the original value addi $t3, $t1, 1 slt $t2, $t0, $t3 bne $t2, $0, label |
Branch Greater Than or Equal |
bge $t0, $t1, label |
# test for opposite # and branch on failure slt $t2, $t0, $t1 beq $t2, $0, label |