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Tue, 25 Oct 2022 12:55:41 +0000 Date: Tue, 25 Oct 2022 13:55:28 +0100 From: Szabolcs Nagy To: Wilco Dijkstra Cc: Adhemerval Zanella Netto , Andrew Pinski , GNU C Library Subject: Re: [PATCH] aarch64: Use memcpy_simd as the default memcpy Message-ID: References: <84c7e095-239a-a504-ab7d-ef178051163c@linaro.org> Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: LO4P123CA0474.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:1a8::11) To DB9PR08MB7179.eurprd08.prod.outlook.com (2603:10a6:10:2cc::19) MIME-Version: 1.0 X-MS-TrafficTypeDiagnostic: DB9PR08MB7179:EE_|AS8PR08MB9839:EE_|AM7EUR03FT050:EE_|PA4PR08MB6077:EE_ X-MS-Office365-Filtering-Correlation-Id: 08400f79-b214-409b-5e33-08dab6883e83 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:DB9PR08MB7179.eurprd08.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230022)(4636009)(136003)(396003)(376002)(39860400002)(366004)(346002)(451199015)(316002)(6636002)(37006003)(53546011)(54906003)(186003)(2906002)(36756003)(2616005)(6506007)(8676002)(4326008)(6862004)(6512007)(8936002)(26005)(4744005)(44832011)(41300700001)(5660300002)(66476007)(66556008)(86362001)(66946007)(6666004)(6486002)(38100700002)(478600001);DIR:OUT;SFP:1101; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Oct 2022 12:55:50.6325 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 08400f79-b214-409b-5e33-08dab6883e83 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: AM7EUR03FT050.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PA4PR08MB6077 X-Spam-Status: No, score=-5.9 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: The 10/19/2022 12:31, Wilco Dijkstra via Libc-alpha wrote: > Hi Adhemerval, > > On 13/10/22 09:28, Wilco Dijkstra via Libc-alpha wrote: > > Hi Andrew, > > > >> This changes how neoverse-n2 is handled, is that expected? > >> That is neoverse-n2 was returning __memcpy_simd before and now will be > >> returning __memcpy_sve as n2 has SVE. > > > > Yes, the SVE memcpy can be used by any CPU that supports SVE. Having this > > as a general rule is better than special casing every CPU. > > > Maybe move this change to a different patch? > > That if statement made no sense after the change, so I removed it altogether. Either > way, it doesn't seem large or important enough to warrant a separate patch. I could > add a note in the commit log, eg: > > Since __memcpy_simd is the fastest memcpy on almost all cores, use it by default. > If SVE is available, a SVE memcpy will be used by default (including Neoverse N2). the patch is OK to commit with this note. thanks.