From: Joseph Myers <joseph@codesourcery.com>
To: Wilco Dijkstra <Wilco.Dijkstra@arm.com>
Cc: "libc-alpha@sourceware.org" <libc-alpha@sourceware.org>, nd <nd@arm.com>
Subject: Re: [PATCH 1/7] sin/cos slow paths: avoid slow paths for small inputs
Date: Thu, 22 Mar 2018 22:13:00 -0000 [thread overview]
Message-ID: <alpine.DEB.2.20.1803222213270.6153@digraph.polyomino.org.uk> (raw)
In-Reply-To: <DB6PR0801MB2053D7E3F614417A60F761BC83AA0@DB6PR0801MB2053.eurprd08.prod.outlook.com>
On Wed, 21 Mar 2018, Wilco Dijkstra wrote:
> This series of patches removes the slow patchs from sin, cos and sincos.
> Besides greatly simplifying the implementation, the new version is also much
> faster for inputs up to PI (41% faster) and for large inputs needing range
> reduction (27% faster).
>
> ULP is ~0.55 with no errors found after testing 1.6 billion inputs across most
> of the range with mpsin and mpcos. The number of incorrectly rounded results
> (ie. ULP >0.5) is at most ~2750 per million inputs between 0.125 and 0.5,
> the average is ~850 per million between 0 and PI.
>
> Tested on AArch64 and x86_64 with no regressions.
>
> The first patch removes the slow paths for the cases where the input is small
> and doesn't require range reduction. Update ULP tables for sin, cos and sincos
> on AArch64 and x86_64.
OK.
--
Joseph S. Myers
joseph@codesourcery.com
prev parent reply other threads:[~2018-03-22 22:13 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-21 17:50 Wilco Dijkstra
2018-03-22 22:13 ` Joseph Myers [this message]
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