# riscv_memops

**Repository Path**: itopen/riscv_memops

## Basic Information

- **Project Name**: riscv_memops
- **Description**: fork from https://github.com/avx/riscv_memops.git
- **Primary Language**: Unknown
- **License**: BSD-2-Clause
- **Default Branch**: main
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2024-10-10
- **Last Updated**: 2024-10-10

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# risc-v memcpy, memset, memmove functions

Optimized memcpy, memset, memmove functions written in RISC-V assembler.
Everyone wants to reduce the size of the code, so in order to comply with
the compressed ISA specification, here preferably s0-s1, a0-a5 registers
are used.

Minimal supported risc-v ISA: rv32e

## code size

rv64gc: memset: 188 bytes, memcpy: 188 bytes, memmove: 266 bytes (324 with lh/sh)

## performance

- rv64: memcpy(page1, page2, 4096) => 1178 instructions; 3.477 bytes per ins. (tends to 3.66)
- rv64: memset(page, 0, 4096) => 574 instructions; 7.13 bytes per ins. (tends to 7.31)
- memmove: 5 instructions per load/store LEN where LEN is depend on the mutual alignment of src/dst.