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not

Bitwise NOT (bit inversion) Pseudo-instruction

Sets $t1 to the bitwise complement of $t2, flipping every bit.

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. 
# Complement the low byte pattern. Inspect $t2: 0xFFFFFFF0.
li $t0, 0xF
not $t2, $t0