# `or`

[RISC-V Documentation](https://asm-editor.specy.app/documentation/risc-v.md) › [Instructions](https://asm-editor.specy.app/documentation/risc-v/instruction.md)

Web page: https://asm-editor.specy.app/documentation/risc-v/instruction/or

**Bitwise OR**

Category: Logic

Sets the first register to the bitwise OR of the second and third.

[RISC-V manual: or](https://docs.riscv.org/reference/isa/v20260120/unpriv/rv32.html#norm:and_or_xor_op)

Used in: [Arithmetic, logic and bits](https://asm-editor.specy.app/learn/courses/risc-v/think-in-assembly/arithmetic-logic-and-bits.md) (RISC-V assembly), [The snake game](https://asm-editor.specy.app/learn/courses/risc-v/examples/snake.md) (RISC-V assembly), [Flappy ASM](https://asm-editor.specy.app/learn/courses/risc-v/examples/flappy-asm.md) (RISC-V assembly)

## Forms

- `or t1, t2, t3`

## 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`.

## Example

```riscv
.text
li t0, 13
li t1, 5
# t0=13, t1=5; or writes 13 to t2.
or t2, t0, t1
```