Re: [PATCH v3 0/3] Optimize GCD performance on RISC-V by selecting implementation at runtime

[patchwork-bot+linux-riscv]

Hello:

This series was applied to riscv/linux.git (fixes)
by Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>:

On Fri,  6 Jun 2025 21:47:55 +0800 you wrote:
> The current implementation of gcd() selects between the binary GCD and
> the odd-even GCD algorithm at compile time, depending on whether
> CONFIG_CPU_NO_EFFICIENT_FFS is set. On platforms like RISC-V, however,
> this compile-time decision can be misleading: even when the compiler
> emits ctz instructions based on the assumption that they are efficient
> (as is the case when CONFIG_RISCV_ISA_ZBB is enabled), the actual
> hardware may lack support for the Zbb extension. In such cases, ffs()
> falls back to a software implementation at runtime, making the binary
> GCD algorithm significantly slower than the odd-even variant.
> 
> [...]

Here is the summary with links:
  - [v3,1/3] lib/math/gcd: Use static key to select implementation at runtime
    https://git.kernel.org/riscv/c/b3d5fd6f82dd
  - [v3,2/3] riscv: Optimize gcd() code size when CONFIG_RISCV_ISA_ZBB is disabled
    https://git.kernel.org/riscv/c/26b537edc533
  - [v3,3/3] riscv: Optimize gcd() performance on RISC-V without Zbb extension
    https://git.kernel.org/riscv/c/36e224168721

You are awesome, thank you!
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