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Re: [PATCH] x86-64: Optimize e_expf with FMA [BZ #21912]

From: Arjan van de Ven <arjan at linux dot intel dot com>
To: Szabolcs Nagy <szabolcs dot nagy at arm dot com>, Carlos O'Donell <carlos at redhat dot com>, "H.J. Lu" <hjl dot tools at gmail dot com>, GNU C Library <libc-alpha at sourceware dot org>
Cc: nd at arm dot com
Date: Wed, 16 Aug 2017 07:59:10 -0700
Subject: Re: [PATCH] x86-64: Optimize e_expf with FMA [BZ #21912]
Authentication-results: sourceware.org; auth=none
References: <6d943008-ffb1-af02-ddf3-f287fe99ff1f@redhat.com> <aedfbd8e-8973-ddff-9bbf-9eac89c1d633@linux.intel.com> <59945D11.3050908@arm.com>

On 8/16/2017 7:56 AM, Szabolcs Nagy wrote:

based on my benchmarks portable c code can
easily beat the hand written sse asm


the hand written sse asm is not great on skylake or similar new cpus.
(few serious glass jaws)

the avx one is a lot better... but I'll welcome the challenge.

if you have a version in C, can you give an URL or something to it;
I'll just hook it into my local testbench and compare

Follow-Ups:
- Re: [PATCH] x86-64: Optimize e_expf with FMA [BZ #21912]
  - From: Szabolcs Nagy

References:
- Re: [PATCH] x86-64: Optimize e_expf with FMA [BZ #21912]
  - From: Carlos O'Donell
- Re: Re: [PATCH] x86-64: Optimize e_expf with FMA [BZ #21912]
  - From: Arjan van de Ven
- Re: [PATCH] x86-64: Optimize e_expf with FMA [BZ #21912]
  - From: Szabolcs Nagy

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