Bitwise logical operations
I-type
andi $rt, $rs, immed  # R[t] <- R[s] & immed Bitwise AND immediate
ori  $rt, $rs, immed  # R[t] <- R[s] | immed Bitwise OR immediate
xori $rt, $rs, immed  # R[t] <- R[s] ^ immed Bitwise XOR immediate
Semantics:
R[t] <-- R[s] op (0)16::IR15-0
Note that immediate value is zero-extended
No NOR immediate