# `fsrm`

[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/fsrm

**Swap FP rounding mode** · Pseudo-instruction

Category: Floating point

Swaps the second register into the FP rounding mode, storing the old mode in the first, or, when given one register, only writes that register.

[RISC-V manual: csrrw](https://docs.riscv.org/reference/isa/v20260120/unpriv/zicsr.html#norm:csrrw_op)

## Forms

- `fsrm t1, t2`
  - `fsrm t1, t2` → `csrrw t1, frm, t2`

- `fsrm t1` · Write FP rounding mode
  - `fsrm t1` → `csrrw zero, frm, t1`

## 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`.

## Example

```riscv
# Initialize frm, then use fsrm to read its old value or update it.
.text
li t3, 0
csrw t3, frm
li t0, 1
fsrm t1, t0
# t1=0 is the old value; frm becomes 1.
```