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Re: [RFC][PATCH 0/2] aarch64: Add optimized ASIMD versions of sinf/cosf
- From: Wilco Dijkstra <Wilco dot Dijkstra at arm dot com>
- To: "adhemerval dot zanella at linaro dot org" <adhemerval dot zanella at linaro dot org>, "Ashwin dot Sekhar at cavium dot com" <Ashwin dot Sekhar at cavium dot com>, Siddhesh Poyarekar <siddhesh at gotplt dot org>
- Cc: nd <nd at arm dot com>, "libc-alpha at sourceware dot org" <libc-alpha at sourceware dot org>, Szabolcs Nagy <Szabolcs dot Nagy at arm dot com>
- Date: Tue, 13 Jun 2017 17:49:10 +0000
- Subject: Re: [RFC][PATCH 0/2] aarch64: Add optimized ASIMD versions of sinf/cosf
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Adhemerval Zanella wrote:
> I think a good starting point I would be if Ashwin in could provide us with a C skeleton with same implementation done in assembly.
I don't see the point of asking him to do that. It would be a significant amount of
work which would be wasted once Szabolcs posts his implementation.
What I'd like to ask Ashwin is which benchmarks show a speedup due to
his patch and whether it is essential they get a speedup this release
(rather than a larger speedup later). I don't recall seeing sinf/cosf in profiles
in popular benchmarks, so I don't understand the urgency of doing this now.
What I think would be useful is to start collecting real traces of actual applications
or large benchmarks like SPEC and creating representative microbenchmarks
using that data.
Wilco