Re: [PATCH v3 6/8] riscv: lib: add strnlen implementation

Andy Shevchenko
2026-01-20T07:31:33Z

On Tue, Jan 20, 2026 at 02:58:50PM +0800, Feng Jiang wrote:
> Add an optimized strnlen() implementation for RISC-V. This version
> includes a generic word-at-a-time optimization and a Zbb-powered
> optimization using the 'orc.b' instruction, derived from the strlen
> implementation.
>
> Benchmark results (QEMU TCG, rv64):
> Length | Original (MB/s) | Optimized (MB/s) | Improvement
> -------|-----------------|------------------|------------
> 16 B | 189 | 310 | +64.0%
> 512 B | 344 | 1535 | +346.2%
> 4096 B | 363 | 1854 | +410.7%

> Suggested-by: Andy Shevchenko <andy@kernel.org>

Wrong tag, I have zero knowledge about RISC V.

--
With Best Regards,
Andy Shevchenko