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Thu, 13 Oct 2022 12:28:12 +0000 From: Wilco Dijkstra To: Andrew Pinski CC: GNU C Library Subject: Re: [PATCH] aarch64: Use memcpy_simd as the default memcpy Thread-Topic: [PATCH] aarch64: Use memcpy_simd as the default memcpy Thread-Index: AQHY3k3KrH6nKvBA1ku53UaRqmMnDa4LIKQAgAEe1YU= Date: Thu, 13 Oct 2022 12:28:12 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-GB, en-US Content-Language: en-GB X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: Authentication-Results-Original: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=arm.com; x-ms-traffictypediagnostic: AS4PR08MB7901:EE_|DB3PR08MB8844:EE_|VE1EUR03FT035:EE_|AS8PR08MB8610:EE_ X-MS-Office365-Filtering-Correlation-Id: 42e6bd6e-0e0a-4142-a1b9-08daad166b68 x-checkrecipientrouted: true nodisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0; X-Microsoft-Antispam-Message-Info-Original: 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 X-Forefront-Antispam-Report-Untrusted: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:AS4PR08MB7901.eurprd08.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230022)(4636009)(376002)(396003)(346002)(366004)(39860400002)(136003)(451199015)(26005)(6506007)(38100700002)(91956017)(122000001)(66446008)(4326008)(66946007)(8676002)(64756008)(316002)(76116006)(66476007)(55016003)(66556008)(71200400001)(38070700005)(33656002)(9686003)(7696005)(478600001)(6916009)(41300700001)(86362001)(8936002)(2906002)(186003)(5660300002)(4744005)(52536014);DIR:OUT;SFP:1101; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Oct 2022 12:28:22.8157 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 42e6bd6e-0e0a-4142-a1b9-08daad166b68 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: VE1EUR03FT035.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR08MB8610 X-Spam-Status: No, score=-5.2 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,FORGED_SPF_HELO,KAM_DMARC_NONE,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE,TXREP,UNPARSEABLE_RELAY autolearn=no 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 Andrew,=0A= =0A= > This changes how neoverse-n2 is handled, is that expected?=0A= > That is neoverse-n2 was returning __memcpy_simd before and now will be=0A= > returning __memcpy_sve as n2 has SVE.=0A= =0A= Yes, the SVE memcpy can be used by any CPU that supports SVE. Having this= =0A= as a general rule is better than special casing every CPU.=0A= =0A= Cheers,=0A= Wilco=