orn

Operands

reg, reg, reg

OR with inverted operand : Set t1 to the bitwise OR of t2 and the bitwise NOT of t3

OR with inverted operand : Set t1 to the bitwise OR of t2 and the bitwise NOT of t3 orn t1,t2,t3

.text
li t0, 13
li t1, 5
# t0=13, t1=5; orn writes -1 (0xFFFFFFFF) to t2.
orn t2, t0, t1
1
2
3
4
5