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subiu

Subtract immediate unsigned (no overflow trap) Pseudo-instruction

Subtracts an immediate from $t2 into $t1 and wraps on overflow instead of trapping.

Forms

Operands

$t1
Any general-purpose register, $0 to $31, using its numeric or named spelling, such as $8 or $t0 ($zero is $0; $ra is $31).
$t2
A general-purpose register. It may be the same register as $t1.
imm32
A 32-bit immediate, -2147483648 to 4294967295. Pseudoinstruction expansion may overwrite $at, losing its previous value. 
# Subtract immediate 3 from 7. Inspect $t2: 4.
li $t0, 7
subiu $t2, $t0, 3