From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail3-relais-sop.national.inria.fr (mail3-relais-sop.national.inria.fr [192.134.164.104]) by sourceware.org (Postfix) with ESMTPS id BD0E43858D28 for ; Thu, 17 Aug 2023 06:46:37 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org BD0E43858D28 Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=inria.fr Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=inria.fr DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=inria.fr; s=dc; h=date:message-id:from:to:cc:in-reply-to:subject: references; bh=hYL2JtBBLhQRJ1DMDBbLCK3KkAJKRmF4p0HdrwfNMiA=; b=A6PPgT3hiUMcZko2Mm4/ZXAhSeSn5DraaUp3iJTLxuWGo7ajMW+tNFQ7 NiWqYoVG1rr6NUQuaz/5dRHhaT3+aQnRrJMWL70qznZdkmp8smJ9GbWzL bSYFTFd/EIiaQLQTYRNVY67tGGjGJiPwx11ogXaVGjxPlRug28esNInkD E=; Authentication-Results: mail3-relais-sop.national.inria.fr; dkim=none (message not signed) header.i=none; spf=SoftFail smtp.mailfrom=Paul.Zimmermann@inria.fr; spf=None smtp.helo=postmaster@coriandre Received-SPF: SoftFail (mail3-relais-sop.national.inria.fr: domain of Paul.Zimmermann@inria.fr is inclined to not designate 152.81.9.227 as permitted sender) identity=mailfrom; client-ip=152.81.9.227; receiver=mail3-relais-sop.national.inria.fr; envelope-from="Paul.Zimmermann@inria.fr"; x-sender="Paul.Zimmermann@inria.fr"; x-conformance=spf_only; x-record-type="v=spf1"; x-record-text="v=spf1 ip4:128.93.142.0/24 ip4:192.134.164.0/24 ip4:128.93.162.160 ip4:89.107.174.7 mx ~all" Received-SPF: None (mail3-relais-sop.national.inria.fr: no sender authenticity information available from domain of postmaster@coriandre) identity=helo; client-ip=152.81.9.227; receiver=mail3-relais-sop.national.inria.fr; envelope-from="Paul.Zimmermann@inria.fr"; x-sender="postmaster@coriandre"; x-conformance=spf_only X-IronPort-AV: E=Sophos;i="6.01,179,1684792800"; d="scan'208";a="63609606" Received: from coriandre.loria.fr (HELO coriandre) ([152.81.9.227]) by mail3-relais-sop.national.inria.fr with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Aug 2023 08:46:37 +0200 Date: Thu, 17 Aug 2023 08:46:36 +0200 Message-Id: From: Paul Zimmermann To: "H.J. Lu" Cc: libc-alpha@sourceware.org In-Reply-To: <20230811150408.2832625-1-hjl.tools@gmail.com> (libc-alpha@sourceware.org) Subject: Re: [PATCH] x86_64: Add expm1 with FMA References: <20230811150408.2832625-1-hjl.tools@gmail.com> X-Spam-Status: No, score=-2.7 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_MSPIKE_H3,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_PASS,TXREP 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: Hi H.J., > On Skylake, it improves expm1 bench performance by: > > Before After Improvement > max 70.204 68.054 3% > min 20.709 16.2 22% > mean 22.1221 16.7367 24% and it improves slightly the accuracy. The previous largest known error was 0.914 ulp (x=0x1.62f69d171fa65p-2), it is now 0.911: expm1 0 -1 0x1.63be411e096ep-2 [1] [0.911] 0.910655 0.9106541427171914 LGTM Paul