ORI: RISC-V instruction reference

oriBitwise OR immediate 
Sets the first register to the bitwise OR of the second and a sign-extended 12-bit immediate.
RISC-V manual: ori 
Used in Arithmetic, logic and bitsRISC-V assembly
 
Forms  ori , ,   
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. 
imm12 A signed 12-bit immediate, -2048 to 2047. 
 .text
li t0, 13
# t0=13, immediate 5; ori writes 13 to t2.
ori t2, t0, 5