From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail2-relais-roc.national.inria.fr (mail2-relais-roc.national.inria.fr [192.134.164.83]) by sourceware.org (Postfix) with ESMTPS id 356C13973023 for ; Fri, 8 Jan 2021 10:29:46 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 356C13973023 Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=inria.fr Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=Paul.Zimmermann@inria.fr X-IronPort-AV: E=Sophos;i="5.79,330,1602540000"; d="scan'208";a="486070573" Received: from tomate.loria.fr (HELO tomate) ([152.81.10.51]) by mail2-relais-roc.national.inria.fr with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 08 Jan 2021 11:29:45 +0100 Date: Fri, 08 Jan 2021 11:29:45 +0100 Message-Id: From: Paul Zimmermann To: Wilco Dijkstra Cc: Szabolcs.Nagy@arm.com, libc-alpha@sourceware.org In-Reply-To: (message from Wilco Dijkstra on Thu, 7 Jan 2021 19:36:56 +0000) Subject: Re: [PATCH 1/5] Remove slow paths from asin References: <20210104170620.GJ2379@arm.com>, X-Spam-Status: No, score=-3.8 required=5.0 tests=BAYES_00, KAM_DMARC_STATUS, RCVD_IN_MSPIKE_H3, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 08 Jan 2021 10:29:47 -0000 Dear Wilco, the v2 of this series is ok for me, except in the meantime I have found a larger error for tan: tan 0 -1 0x1.c673a473b3503p+3 [0.619] 0.618365 0.6183652837454632 thus you could replace ~0.612 by ~0.619. Let me summarize the largest errors we get with 2.32 and after this patch (on random sampling): 2.32 after patch (with corresponding input) asin 0.500 0.516 0x1.07fffeadab7ecp-3 acos 0.501 0.523 0x1.dffff776c7505p-1 tan 0.500 0.619 0x1.c673a473b3503p+3 atan 0.500 0.523 -0x1.f9004176e07bep-4 atan2 0.500 0.524 0x1.4aa3aada7c44fp-996,0x1.4f32ff56386e8p-993 Best regards, Paul