[PATCH v1 3/6] x86: Remove mem{move|cpy}-ssse3

[Mayshao-oc]

On Mon, Mar 28, 2022 at  9:07 PM H.J. Lu <hjl.tools@gmail.com> wrote:

> On Mon, Mar 28, 2022 at 1:10 AM Mayshao-oc <Mayshao-oc@zhaoxin.com> wrote:
> >
> > On Fri, Mar 25, 2022 at 6:36 PM Noah Goldstein <goldstein.w.n@gmail.com> wrote:
> >
> > > With SSE2, SSE4.1, AVX2, and EVEX versions very few targets prefer
> > > SSSE3. As a result its no longer with the code size cost.
> > > ---
> > > sysdeps/x86_64/multiarch/Makefile          |    2 -
> > > sysdeps/x86_64/multiarch/ifunc-impl-list.c |   15 -
> > > sysdeps/x86_64/multiarch/ifunc-memmove.h   |   18 +-
> > > sysdeps/x86_64/multiarch/memcpy-ssse3.S    | 3151 --------------------
> > > sysdeps/x86_64/multiarch/memmove-ssse3.S   |    4 -
> > > 5 files changed, 7 insertions(+), 3183 deletions(-)
> > > delete mode 100644 sysdeps/x86_64/multiarch/memcpy-ssse3.S
> > > delete mode 100644 sysdeps/x86_64/multiarch/memmove-ssse3.S
> >
> > > On some platforms, such as Zhaoxin, the memcpy performance of SSSE3
> > is better than that of AVX2, and the current computer system has sufficient
> > disk capacity and memory capacity.
>
> How does the SSSE3 version compare against the SSE2 version?

On some Zhaoxin processors, the overall performance of SSSE3 is about
10% higher than that of SSE2.


Best Regards,
May Shao

> > It is strongly recommended to keep the SSSE3 version.
> >
>
>
> --
> H.J.