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Tue, 27 Nov 2018 16:19:33 +0000 Received: from VI1PR0802MB2528.eurprd08.prod.outlook.com ([fe80::3d5c:5229:b634:b1ac]) by VI1PR0802MB2528.eurprd08.prod.outlook.com ([fe80::3d5c:5229:b634:b1ac%11]) with mapi id 15.20.1361.019; Tue, 27 Nov 2018 16:19:33 +0000 From: Dave Rodgman To: "linux-kernel@vger.kernel.org" CC: nd , "herbert@gondor.apana.org.au" , "davem@davemloft.net" , Matt Sealey , "nitingupta910@gmail.com" , "rpurdie@openedhand.com" , "markus@oberhumer.com" , "minchan@kernel.org" , "sergey.senozhatsky.work@gmail.com" , "sonnyrao@google.com" , "gregkh@linuxfoundation.org" , "akpm@linux-foundation.org" Subject: [PATCH 4/7] lib/lzo: 64-bit CTZ on arm64 Thread-Topic: [PATCH 4/7] lib/lzo: 64-bit CTZ on arm64 Thread-Index: AQHUhmz7NhQTQFWpAkKa/DN5+6ly9A== Date: Tue, 27 Nov 2018 16:19:33 +0000 Message-ID: <20181127161913.23863-5-dave.rodgman@arm.com> References: <20181127161913.23863-1-dave.rodgman@arm.com> In-Reply-To: <20181127161913.23863-1-dave.rodgman@arm.com> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.16.4 x-originating-ip: [217.140.106.53] x-clientproxiedby: LO2P265CA0203.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:9e::23) To VI1PR0802MB2528.eurprd08.prod.outlook.com (2603:10a6:800:b0::14) authentication-results: spf=none (sender IP is ) smtp.mailfrom=dave.rodgman@arm.com; 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received-spf: None (protection.outlook.com: arm.com does not designate permitted sender hosts) x-microsoft-antispam-message-info: APHzJAILuXGeJbv/MwOecUCkL+RAW5jO35yFthDjUsRB464J5a7yMFLGvkY0UXaqOQiGLtJPOYFKCDNrqtUs0S/bqMiAY3VXRxRCeEp8/B+CdL/MuxSDa9tyeRSeB9zuL4cebsw21cVANLI14nSRhuvwSX3cczBveWS9BujKKVEwZapiQcFfr8UhCD7xSkjoj6lSXDXmKOkNvKqBj1vO5YDn8muZzfCjJZiabIjuIgEsLKBSFA3+l6kn1ozKkrLNQnNynwL8Vhh/BuCCreyRiuicrF/7FcyTZYZqZVHGv9JckXyw6/WMTtUKSj4eEqHJ8VonoyarEIjJd/II0a5AKZyknihNwe089prI4mnTwgw= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-Network-Message-Id: 7a3df203-2f95-43c7-0635-08d654841da4 X-MS-Exchange-CrossTenant-originalarrivaltime: 27 Nov 2018 16:19:33.1891 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR0802MB2256 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Matt Sealey LZO leaves some performance on the table by not realising that arm64 can optimize count-trailing-zeros bit operations. Add CONFIG_ARM64 to the checked definitions alongside CONFIG_X86_64 to enable the use of rbit/clz instructions on full 64-bit quantities. Signed-off-by: Matt Sealey Signed-off-by: Dave Rodgman --- lib/lzo/lzodefs.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/lib/lzo/lzodefs.h b/lib/lzo/lzodefs.h index c0193f726db0..c8965dc181df 100644 --- a/lib/lzo/lzodefs.h +++ b/lib/lzo/lzodefs.h @@ -28,7 +28,7 @@ =20 #if defined(__BIG_ENDIAN) && defined(__LITTLE_ENDIAN) #error "conflicting endian definitions" -#elif defined(CONFIG_X86_64) +#elif defined(CONFIG_X86_64) || defined(CONFIG_ARM64) #define LZO_USE_CTZ64 1 #define LZO_USE_CTZ32 1 #elif defined(CONFIG_X86) || defined(CONFIG_PPC) --=20 2.16.4