[PATCH v4 2/2] x86_64: roundeven with sse4.1 support

[Cui, Lili]

> -----Original Message-----
> From: H.J. Lu <hjl.tools@gmail.com>
> Sent: Thursday, May 28, 2020 8:32 PM
> To: Florian Weimer <fweimer@redhat.com>; Cui, Lili <lili.cui@intel.com>
> Cc: H.J. Lu via Libc-alpha <libc-alpha@sourceware.org>; Shen-Ta Hsieh
> <ibmibmibm.tw@gmail.com>
> Subject: Re: [PATCH v4 2/2] x86_64: roundeven with sse4.1 support
>
> On Thu, May 28, 2020 at 5:22 AM Florian Weimer <fweimer@redhat.com<mailto:fweimer@redhat.com>>
> wrote:
> >
> > * H. J. Lu via Libc-alpha:
> >
> > >> Here is a benchmark result on my AMD Ryzen 9 3900X system:
> > >
> > > Since we don't know or may not care SSE4 machines without AVX,
> > > should we make it to AVX only?
> >
> > What about Goldmont/Tremont?  Those are current CPUs which do not
> > support AVX, but I think they have sufficient SSE4 support levels for
> > this change.
> >
>
> Good point.  Lili, please collect glibc micro benchmark roundeven/roundevenf
> data before and after:
>
> https://sourceware.org/pipermail/libc-alpha/2020-May/113533.html
>
> on Tremont.
>
> --
> H.J.

Hi H.J,

Result is here.
benchmark result before this commit on Tremont

      [X]

benchmark result after this commit on Tremont