==XORI	Bitwise exclusive or immediate==

xori -3 //checking if all 1s gives us 0 for the first 16 bits

lui $4, 0xFFFF 
ori $4, $4, 0xFFFF 
xori $2, $4, 0xFFFF
jr $0

ref = 4294901760 - (FFFF0000)

3c04ffff
3484ffff
3882ffff
00000008

xori -4 //should have all 1s

lui $4, 0xFFFF 
ori $4, $4, 0xFFFF 
xori $2, $4, 0x0000
jr $0

ref = 4294967295 - (FFFFFFFF)

3c04ffff
3484ffff
38820000
00000008