From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/13695 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Szabolcs Nagy Newsgroups: gmane.linux.lib.musl.general Subject: Re: Possible Mistype in exp.c Date: Wed, 30 Jan 2019 15:10:42 +0100 Message-ID: <20190130141040.GG21289@port70.net> References: <20190129110135.GC21289@port70.net> <20190129114308.GD21289@port70.net> <20190130093738.GE21289@port70.net> <20190130121947.GF21289@port70.net> Reply-To: musl@lists.openwall.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="115746"; mail-complaints-to="usenet@blaine.gmane.org" User-Agent: Mutt/1.10.1 (2018-07-13) To: musl@lists.openwall.com Original-X-From: musl-return-13711-gllmg-musl=m.gmane.org@lists.openwall.com Wed Jan 30 15:10:57 2019 Return-path: Envelope-to: gllmg-musl@m.gmane.org Original-Received: from mother.openwall.net ([195.42.179.200]) by blaine.gmane.org with smtp (Exim 4.89) (envelope-from ) id 1goqZt-000Tt8-Ey for gllmg-musl@m.gmane.org; Wed, 30 Jan 2019 15:10:57 +0100 Original-Received: (qmail 30154 invoked by uid 550); 30 Jan 2019 14:10:54 -0000 Mailing-List: contact musl-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Original-Received: (qmail 30136 invoked from network); 30 Jan 2019 14:10:54 -0000 Mail-Followup-To: musl@lists.openwall.com Content-Disposition: inline In-Reply-To: Xref: news.gmane.org gmane.linux.lib.musl.general:13695 Archived-At: * Alexander Monakov [2019-01-30 15:44:23 +0300]: > On Wed, 30 Jan 2019, Szabolcs Nagy wrote: > > for < 1 ulp the main trick is computing the result as x+y where x is > > exact and y is inexact but much smaller than x in magnitude. (this is > > the only way to get worst case error < 1 ulp with an fp operation that > > does a rounding and at least one of the inputs is inexact.) > > As I recall this was covered in your GNU Cauldron presentation. > Can you upload the slides of that talk to the GCC wiki? > > (I can help with adding your account to EditorGroup if needed > or upload the slides on your behalf if you send me the pdf) please upload it on my behalf if you can: http://port70.net/~nsz/articles/other/cauldron2018-slides.pdf (that presentation did not go into algorithmic details though) for others: https://gcc.gnu.org/wiki/cauldron2018#Slides.2C_Videos_and_Notes