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

Feng Jiang
2026-01-21T05:52:39Z

On 2026/1/20 15:31, Andy Shevchenko wrote:
> 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.
>

Sorry for the confusion. I misunderstood the scope of the 'Suggested-by' tag.
I will remove it from the RISC-V specific implementation patches and only keep
relevant credits in the benchmarking/testing patches where your feedback was
applied.

Thanks for clarifying!

--
With Best Regards,
Feng Jiang