From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on dcvr.yhbt.net X-Spam-Level: X-Spam-ASN: AS31976 209.132.180.0/23 X-Spam-Status: No, score=-4.0 required=3.0 tests=AWL,BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_EF,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,SPF_HELO_PASS,SPF_PASS shortcircuit=no autolearn=ham autolearn_force=no version=3.4.2 Received: from sourceware.org (server1.sourceware.org [209.132.180.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dcvr.yhbt.net (Postfix) with ESMTPS id 5CFD91F45F for ; Tue, 7 May 2019 15:21:32 +0000 (UTC) DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id :list-unsubscribe:list-subscribe:list-archive:list-post :list-help:sender:date:from:to:cc:subject:in-reply-to:message-id :references:mime-version:content-type; q=dns; s=default; b=He8UT fcOL0ytxeACicLbeG7by7lgo/04kXjC8qZWblQhZU2hiFE5snvUmYF9/fdB6DWIB rV5lAk/riFwl5LG30MDkP639JkULs70y98nB97E+F+FBU8VvCEBEY+zR3GNCvzVv J1kxQXZwUVSe7E6OS9zSNOHjx5SCNs4iYAVmjA= DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id :list-unsubscribe:list-subscribe:list-archive:list-post :list-help:sender:date:from:to:cc:subject:in-reply-to:message-id :references:mime-version:content-type; s=default; bh=rbLau/0FLmr zRfiDaUTagv7TQYc=; b=sTMfBDDbH0fOZfZ7IdFk/oVr7peK4FPc8tgqSEeQL79 TPP8t+9Ic+6CHhqFA+VaE9SwniIvj5esfFSsV5ZVWxKi5sPtnBftBuUfjcM2m3Aj HeZf6NLNg8bDtEabM4z2+NfgfZq7flza/g0beGYw0dXO2gtx0C8QnnjrOf9U1zuQ = Received: (qmail 126469 invoked by alias); 7 May 2019 15:21:29 -0000 Mailing-List: contact libc-alpha-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: libc-alpha-owner@sourceware.org Received: (qmail 126456 invoked by uid 89); 7 May 2019 15:21:29 -0000 Authentication-Results: sourceware.org; auth=none X-HELO: relay1.mentorg.com Date: Tue, 7 May 2019 15:21:20 +0000 From: Joseph Myers To: Shawn Landden CC: Subject: Re: [PATCH] powerpc: add libmvec implementations of log and logf In-Reply-To: <20190506203210.8536-1-shawn@git.icu> Message-ID: References: <20190505203438.28140-1-shawn@git.icu> <20190506203210.8536-1-shawn@git.icu> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" On Mon, 6 May 2019, Shawn Landden wrote: > When fed numbers in the range of 0 to 2^32-1 (as doubles) the vector log > is about 75% faster than scalar log. Since you and Bert Tenjy have now posted rival patch versions implementing vector log, a key performance comparison would be against the version posted by Bert Tenjy - and in general, you should compare and contrast the two versions of log to justify why one might be better than another. It's also important in such cases to be very clear about where exactly the patch you are posting fits into exactly what other patch series. -- Joseph S. Myers joseph@codesourcery.com