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

[Kito Cheng]

ack, it seems ok, let me merge tomorrow after local testing pass

Pincheng Wang <pincheng.plct@isrc.iscas.ac.cn> 於 2026年4月16日週四 下午9:18寫道：
>
> 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(-)
> >
>