[PATCH] x86_64: Add expm1 with FMA

[Sunil Pandey]

On Wed, Aug 16, 2023 at 11:46 PM Paul Zimmermann via Libc-alpha <
libc-alpha@sourceware.org> wrote:

>        Hi H.J.,
>
> > On Skylake, it improves expm1 bench performance by:
> >
> >         Before       After     Improvement
> > max     70.204       68.054       3%
> > min     20.709       16.2         22%
> > mean    22.1221      16.7367      24%
>
> and it improves slightly the accuracy. The previous largest known error was
> 0.914 ulp (x=0x1.62f69d171fa65p-2), it is now 0.911:
>
> expm1 0 -1 0x1.63be411e096ep-2 [1] [0.911] 0.910655 0.9106541427171914
>
> LGTM
>
> Paul
>
>
I would like to backport this patch to release branches.
Any comments or objections?

--Sunil
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