Re: [PATCH v3 0/1] riscv: add vectorized memset, memcpy and memmove

Hi all,

Gentle ping on this patch series.  Please let me know if you need any 
clarifications, reworks, or further testing from my end. :)

Moreover, I’m also ready to upstream more RVV-enabled string functions 
for newlib once this series lands, so I’d welcome any early feedback on 
the overall direction.

Best regards,
Pincheng Wang

On 2026/3/5 14:19, Pincheng Wang wrote:
> Hi all,
> 
> This v3 patch adds RISC-V Vector (RVV) optimized implementations for
> memset, memcpy and memmove.
> 
> Changes since v2:
> - Changed conditional compilation order, so vector path will not be
>    chosen when optimizing for size.
> 
> Changes since v1:
> - Switch the conditional compilation macro from __riscv_v to
>    __riscv_vector.
> - Replaced '.option arch,+v' with '.option arch,+zve32x'.
> - Removed an unnecessary unconditional jump instruction in
>    memmove-asm.S.
> - In memcpy and memmove, when __riscv_misaligned_fast is not defined,
>    the destination address is now aligned to SZREG to improve performance
>    on systems with slow misaligned accesses.
> 
> These implementations use the RVV extension with e8 element size and m8
> LMUL, and are conditionally compiled only when __riscv_vector is
> defined, ensuring compatibility with non-vector RISC-V systems.
> 
> Benchmark results on Spacemit X60 (Muse-pi) and Canaan K230 show
> significant improvements.
> 
> memcpy: Up to 4.84x on Muse-pi and 4.66x on K230.
> memset: Up to 4.31x on Muse-pi and 3.14x on K230.
> memmove: Up to 2.87x on Muse-pi and 1.48x on K230.
> 
> Comments and suggestions are greatly appreciated. Thank you for your
> time and review!
> 
> Best regards,
> Pincheng Wang
> 
> Pincheng Wang (1):
>    riscv: add vectorized memset, memcpy and memmove
> 
>   newlib/libc/machine/riscv/memcpy-asm.S  | 52 ++++++++++++++
>   newlib/libc/machine/riscv/memcpy.c      |  2 +-
>   newlib/libc/machine/riscv/memmove-asm.S | 93 +++++++++++++++++++++++++
>   newlib/libc/machine/riscv/memmove.c     |  2 +-
>   newlib/libc/machine/riscv/memset.S      | 18 +++++
>   5 files changed, 165 insertions(+), 2 deletions(-)
>