From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from butterfly.birch.relay.mailchannels.net (butterfly.birch.relay.mailchannels.net [23.83.209.27]) by sourceware.org (Postfix) with ESMTPS id 9D87B38319D5 for ; Fri, 9 Dec 2022 15:24:25 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 9D87B38319D5 Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=gotplt.org Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=gotplt.org X-Sender-Id: dreamhost|x-authsender|siddhesh@gotplt.org Received: from relay.mailchannels.net (localhost [127.0.0.1]) by relay.mailchannels.net (Postfix) with ESMTP id 4A84E101EBB; Fri, 9 Dec 2022 15:24:24 +0000 (UTC) Received: from pdx1-sub0-mail-a306.dreamhost.com (unknown [127.0.0.6]) (Authenticated sender: dreamhost) by relay.mailchannels.net (Postfix) with ESMTPA id BBA2C1009D5; Fri, 9 Dec 2022 15:24:23 +0000 (UTC) ARC-Seal: i=1; s=arc-2022; d=mailchannels.net; t=1670599463; a=rsa-sha256; cv=none; b=QIIPt6RGEKI4o1iIHl17z7jMs8dAPQluWSsoooi3tg+Jr77mL056GIQ0FgFLWxD12VbDgb DSVfqFme0mgp4slxN85hCJqoOpcmPANtsWzLTeMnKc6rvfuNWQKG0JLVW4eLF/LSGyyGVG /gOP83riT3e/zBE6UW7H0572NCI3IhKvUMeBsMMeRNXXeLnAw2kqUu8WaafPBp4in+9nGJ CTU2NOYn3nvH3gwIOMORrUlz177s3TzWHu8UMmqqI1sp1g6XBM3pLVtYW8TfnucNWfuqfc Nbb5KKdrWbH+/da7jg5dwx8wxre28EO48J0mWwIEk29A6+adExgvHPgpbu+iDg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=mailchannels.net; s=arc-2022; t=1670599463; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=m9lZYR0aXClzJsHOZAy0X/hktLuNuecohHp976DoICI=; b=SCF0w5YoVdaAcjOmKYJx3VMEhATk0sV6FsygeD9vHjJUo9pw3SrJ5EcC5mX2XVauuOLi1L 6jLi0GEvwmgBAImvCup+4wlN2fTbnVFDFg7kT2eRgopeqek8guEVi30CPenYUWysXO6O/M NJSXQLDRd4w03h3YSyN+gA7VI9CPwXLDxfvncql0xgqTN8TefiDVxQlOTQ2qUvYjykblW4 JTI57kmzVPbJCKL/0mvmrw4lw3B6Det42vt4mZ9sUfIneWDb+b88mBwqvwtsopG4MB+eUm Nc6ApufY7Ud05pfL0PRXGIFn8QaiKhiv4O0ivlzckTX4S+jH3IiVd54uFyDVKA== ARC-Authentication-Results: i=1; rspamd-d48c5ddb-fvkxb; auth=pass smtp.auth=dreamhost smtp.mailfrom=siddhesh@gotplt.org X-Sender-Id: dreamhost|x-authsender|siddhesh@gotplt.org X-MC-Relay: Neutral X-MailChannels-SenderId: dreamhost|x-authsender|siddhesh@gotplt.org X-MailChannels-Auth-Id: dreamhost X-Left-Abaft: 065daedd2a39c1ba_1670599464038_634654168 X-MC-Loop-Signature: 1670599464038:963713389 X-MC-Ingress-Time: 1670599464038 Received: from pdx1-sub0-mail-a306.dreamhost.com (pop.dreamhost.com [64.90.62.162]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384) by 100.109.138.16 (trex/6.7.1); Fri, 09 Dec 2022 15:24:24 +0000 Received: from [192.168.0.182] (bras-base-toroon4834w-grc-23-76-68-24-147.dsl.bell.ca [76.68.24.147]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: siddhesh@gotplt.org) by pdx1-sub0-mail-a306.dreamhost.com (Postfix) with ESMTPSA id 4NTFDl0kG2z6v; Fri, 9 Dec 2022 07:24:22 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gotplt.org; s=dreamhost; t=1670599463; bh=m9lZYR0aXClzJsHOZAy0X/hktLuNuecohHp976DoICI=; h=Date:Subject:To:Cc:From:Content-Type:Content-Transfer-Encoding; b=wO64lvyTNehzDnROw01Q4blyIAaLqGH7y9hNqrcKdJCO8TuCof2dlpb4R8ZS7KGSX zaPa/TzRDQW9j7ZSPChy1iQeXcluanT+PBuSfVdb7h6gUgNEiMJcXTVYr5B1XYCZni FeVeSFsoXOeiJfkEYC9J6p5cyN4mSwj8uN9FTszcCIjRi7NBTypzL+hE2yQCWvaOiq h3rsdgfI9TyPehBKa9nxR8RKWHocH+epyhulyOpj3+psw+wyoptpKYwSD95ix3KNkj U+aKBQ619bGCJFpIv+UU10ygzc7HebtQ0ZtUm/RmVIN7NNMMa9izIT0ETNUtk+Rsgq d5agTyrzqqB9Q== Message-ID: <8862bd85-24ef-42d7-e48a-acdb7ada73c9@gotplt.org> Date: Fri, 9 Dec 2022 10:24:21 -0500 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.5.0 Subject: Re: [RFC]: Removing old Falkor ifuncs Content-Language: en-US To: Wilco Dijkstra Cc: 'GNU C Library' References: From: Siddhesh Poyarekar In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-3031.0 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,NICE_REPLY_A,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,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: On 2022-12-09 10:14, Wilco Dijkstra wrote: > Do we need the ifuncs for Falkor? The SIMD memcpy is now the default > generic memcpy and that is quite similar to the Falkor one, so it seems > time to remove the Falkor variants. Since you are the original author, > what do you think? The key differentiator in memcpy/memmove at that time was the register number usage since that affected how the hardware prefetcher performed. Changing that might affect performance on falkor, although I don't exactly remember by how much. The other key differentiator is in memset, where reading dczid_el0 was expensive on falkor, so the value is hard coded to avoid reading it everytime. Sid