From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from joooj.vinc17.net (joooj.vinc17.net [IPv6:2001:4b99:1:3:216:3eff:fe20:ac98]) by sourceware.org (Postfix) with ESMTPS id 277353858C54 for ; Fri, 16 Feb 2024 09:43:39 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 277353858C54 Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=vinc17.net Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=vinc17.net ARC-Filter: OpenARC Filter v1.0.0 sourceware.org 277353858C54 Authentication-Results: server2.sourceware.org; arc=none smtp.remote-ip=2001:4b99:1:3:216:3eff:fe20:ac98 ARC-Seal: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1708076621; cv=none; b=kqON2CWoLIsyeqIl+blx09DQGqpe0tMzKvSX97jNvM7UU+S6i78+tLinjpFM4wn131q5wVOqE0iQGNO7rKKVWDm/YokEFGKhQkt4QECfgfak77Zf7DsEFWWG8VTxOzqp0fRwQewjL6hJXMIGqvGRPiDrJBRARd2+f69LLMY+cGg= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1708076621; c=relaxed/simple; bh=Pj7BxVUY8M1v7Wr9TnVlUMahbOp0RQSSaP2TAkcRmNM=; h=Date:From:To:Subject:Message-ID:MIME-Version; b=BysXobTQ7OXuE3P6w4NUb/V/76dm4tOokbUYVVt21Q69z+DmBuEgUDM6D3MZJQrCBwAB9ecqIz61VHJFeEKiW3Z7t2pgdzRkvYUZrkSme35ISuWn1i8sm6fGWrFUGNbeS5ieAnc9Cz4nXm9eEJBF4V9bXm7BHvV2/YFShIlaoOQ= ARC-Authentication-Results: i=1; server2.sourceware.org Received: from smtp-qaa.vinc17.net (2a02-8428-1b1d-4d01-96a9-491d-7b48-ba31.rev.sfr.net [IPv6:2a02:8428:1b1d:4d01:96a9:491d:7b48:ba31]) by joooj.vinc17.net (Postfix) with ESMTPSA id CC3A01F2; Fri, 16 Feb 2024 10:43:37 +0100 (CET) Received: by qaa.vinc17.org (Postfix, from userid 1000) id CC5ECCA3237; Fri, 16 Feb 2024 10:43:34 +0100 (CET) Date: Fri, 16 Feb 2024 10:43:34 +0100 From: Vincent Lefevre To: libc-alpha@sourceware.org Subject: Re: document the fact that "Known Maximum Errors" might not be maximal Message-ID: <20240216094334.GA3653@qaa.vinc17.org> Mail-Followup-To: Vincent Lefevre , libc-alpha@sourceware.org References: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Mailer-Info: https://www.vinc17.net/mutt/ User-Agent: Mutt/2.2.12+69 (354c5b11) vl-149028 (2023-12-10) X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,KAM_DMARC_STATUS,SPF_HELO_NONE,SPF_PASS,TXREP,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On 2024-02-16 09:48:07 +0100, Paul Zimmermann wrote: > the attached patch documents the fact that the "Known Maximum Errors" > given in the reference manual might not be maximal. This section lists the known errors of the functions in the math -library. Errors are measured in ``units of the last place''. This is a +library. However, for some functions like the Bessel functions, +larger errors are known, but are documented elsewhere (bugzilla). +Errors are measured in ``units of the last place''. This is a Instead of saying that they are "documented elsewhere", shouldn't the manual be updated? BTW, the manual contains fmaf - - - - - fma - - - - - fmal - - - - - fmaf128 - - - - - fma_ldoublef - - - - - fma_ldouble - - - - - fma_ldoublel - - - - - fma_ldoublef128 - - - - - However, correct rounding is required for these functions. And I can't see any reference to f128, ldoublef, etc. in the manual except in this table. -- Vincent Lefèvre - Web: 100% accessible validated (X)HTML - Blog: Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)