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Re: [PATCH] x86-64: Add sinf with FMA
- From: Nick Alcock <nix at esperi dot org dot uk>
- To: "H.J. Lu" <hongjiu dot lu at intel dot com>
- Cc: GNU C Library <libc-alpha at sourceware dot org>, "H.J. Lu" <hjl dot tools at gmail dot com>, Arjan van de Ven <arjan at linux dot intel dot com>
- Date: Fri, 08 Dec 2017 16:02:29 +0000
- Subject: Re: [PATCH] x86-64: Add sinf with FMA
- Authentication-results: sourceware.org; auth=none
- References: <20171204180905.GA31592@gmail.com>
On 4 Dec 2017, H. J. Lu uttered the following:
> On Skylake, bench-sinf reports performance improvement:
>
> Before After Improvement
> max 153.996 100.094 54%
> min 8.546 6.852 25%
> mean 18.1223 14.4616 25%
>
> Any comments?
Do we have any benchmark runs on older processors? They're not remotely
obsolete: Intel is still selling Broadwell server parts, and the vast
majority of SSE2-capable parts out there at present are not as new as
Skylake.
Are we penalizing them? (I'd guess not, but it would be nice to know.)