[PATCH v3 8/8] riscv: lib: add strrchr implementation

[Andy Shevchenko]

On Tue, Jan 20, 2026 at 02:58:52PM +0800, Feng Jiang wrote:
> Add an assembly implementation of strrchr() for RISC-V.
> 
> This implementation minimizes instruction count and avoids unnecessary
> memory access to the stack. The performance benefits are most visible
> on small workloads (1-16 bytes) where the architectural savings in
> function overhead outweigh the execution time of the scan loop.
> 
> Benchmark results (QEMU TCG, rv64):
>   Length | Original (MB/s) | Optimized (MB/s) | Improvement
>   -------|-----------------|------------------|------------
>   1 B    | 21              | 22               | +4.7%
>   7 B    | 116             | 122              | +5.1%
>   16 B   | 195             | 208              | +6.6%
>   512 B  | 388             | 399              | +2.8%
>   4096 B | 411             | 411              | +0.0%

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

Wrong tag.

-- 
With Best Regards,
Andy Shevchenko