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Wed, 19 Oct 2022 12:31:57 +0000 From: Wilco Dijkstra To: Adhemerval Zanella Netto , 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: AQHY3k3KrH6nKvBA1ku53UaRqmMnDa4LIKQAgAEe1YWAAAMfgIAJaIAG Date: Wed, 19 Oct 2022 12:31:57 +0000 Message-ID: References: <84c7e095-239a-a504-ab7d-ef178051163c@linaro.org> In-Reply-To: <84c7e095-239a-a504-ab7d-ef178051163c@linaro.org> 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_|AS8PR08MB6086:EE_|AM7EUR03FT056:EE_|AM8PR08MB5810:EE_ X-MS-Office365-Filtering-Correlation-Id: 028669e2-4d83-4986-b0a1-08dab1cdefc8 x-checkrecipientrouted: true nodisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Oct 2022 12:32:07.5040 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 028669e2-4d83-4986-b0a1-08dab1cdefc8 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: AM7EUR03FT056.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM8PR08MB5810 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 Adhemerval,=0A= =0A= On 13/10/22 09:28, Wilco Dijkstra via Libc-alpha wrote:=0A= > 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= > Maybe move this change to a different patch?=0A= =0A= That if statement made no sense after the change, so I removed it altogethe= r. Either=0A= way, it doesn't seem large or important enough to warrant a separate patch.= I could=0A= add a note in the commit log, eg:=0A= =0A= Since __memcpy_simd is the fastest memcpy on almost all cores, use it by de= fault.=0A= If SVE is available, a SVE memcpy will be used by default (including Neover= se N2).=0A= =0A= Cheers,=0A= Wilco=