# `rem`

[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/rem

**Remainder**

Category: Arithmetic

Sets the first register to the remainder of the second divided by the third, as signed integers.

[RISC-V manual: rem](https://docs.riscv.org/reference/isa/v20260120/unpriv/m-st-ext.html#norm:rem_remu_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), [Multiply and divide, with the remainder](https://asm-editor.specy.app/learn/courses/risc-v/examples/multiply-and-divide.md) (RISC-V assembly), [A subroutine with its arguments in registers](https://asm-editor.specy.app/learn/courses/risc-v/examples/subroutine-with-register-arguments.md) (RISC-V assembly), [A jump table](https://asm-editor.specy.app/learn/courses/risc-v/examples/jump-table.md) (RISC-V assembly), [Print a nonnegative number in bases 2–36](https://asm-editor.specy.app/learn/courses/risc-v/examples/number-to-string.md) (RISC-V assembly), [A bouncing ball](https://asm-editor.specy.app/learn/courses/risc-v/examples/bouncing-ball.md) (RISC-V assembly), [Arithmetic, logic and bits](https://asm-editor.specy.app/learn/courses/assembly-basics/think-in-assembly/arithmetic-logic-and-bits.md) (Assembly basics)

## Forms

- `rem 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, 18
li t1, 5
# t0=18, t1=5; rem writes 3 to t2.
rem t2, t0, t1
```