OR - RISC-V instruction reference

orBitwise OR 
Sets t1 to the bitwise OR of t2 and t3.
RISC-V manual: or 
Used in Arithmetic, logic and bitsRISC-V assembly
The snake gameRISC-V assembly
 
Forms  or , ,   
Operands t1 Any integer register, x0 to x31, or its named alias, such as zero, t0 or t6. 
t2 An integer register. It may be the same register as t1. 
t3 An integer register. It may be the same register as t1. 
 .text
li t0, 13
li t1, 5
# t0=13, t1=5; or writes 13 to t2.
or t2, t0, t1