[PATCH 1/4] LoongArch: Add ifunc support for strcpy{aligned, unaligned, lsx, lasx}

[Xi Ruoyao]

On Fri, 2023-09-08 at 17:33 +0800, dengjianbo wrote:
> According to glibc strcpy microbenchmark test results(changed to use
> generic_strcpy instead of strlen + memcpy), comparing with generic_strcpy,
> this implementation could reduce the runtime as following:
> 
> Name              Percent of rutime reduced
> strcpy-aligned    10%-45%
> strcpy-unaligned  10%-49%, comparing with the aligned version,unaligned
>                   version experience better performance in case src and dest
>                   cannot be both aligned with 8bytes
> strcpy-lsx        20%-80%
> strcpy-lasx       15%-86%

Generic strcpy calls stpcpy, so if we've optimized stpcpy maybe it's not
necessary to duplicate everything in strcpy.  Is there a benchmark
result comparing the timing with and without this patch, but both with
the second patch (optimized stpcpy)?

-- 
Xi Ruoyao <xry111@xry111.site>
School of Aerospace Science and Technology, Xidian University