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Fri, 6 Sep 2019 16:45:23 +0000 From: Wilco Dijkstra To: "libc-stable@sourceware.org" CC: nd Subject: [2.27 COMMITTED][AArch64] Backport strcmp improvements Thread-Topic: [2.27 COMMITTED][AArch64] Backport strcmp improvements Thread-Index: AQHVZND6WwaxKsuzWUyqLZh3YpDMww== Date: Tue, 01 Jan 2019 00:00:00 -0000 Message-ID: Accept-Language: en-GB, en-US Content-Language: en-GB X-MS-Has-Attach: X-MS-TNEF-Correlator: Authentication-Results-Original: spf=none (sender IP is ) smtp.mailfrom=Wilco.Dijkstra@arm.com; x-originating-ip: [217.140.106.54] x-ms-publictraffictype: Email X-MS-Office365-Filtering-Correlation-Id: 0c9b4792-95a7-42f6-b4ba-08d732e9a0b6 X-MS-Office365-Filtering-HT: Tenant X-Microsoft-Antispam-Untrusted: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600166)(711020)(4605104)(1401327)(4618075)(2017052603328)(7193020);SRVR:VI1PR0801MB2126; X-MS-TrafficTypeDiagnostic: VI1PR0801MB2126:|DB6PR0802MB2424: X-Microsoft-Antispam-PRVS: x-checkrecipientrouted: true x-ms-oob-tlc-oobclassifiers: OLM:2887;OLM:2887; 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The typo is harmless but it's always nice to not have to unnecessarily execute those two instructions. =20=20=20=20 * sysdeps/aarch64/strcmp.S (do_misaligned): Jump back to do_misaligned, not misaligned8. =20=20=20=20 (cherry picked from commit 6ca24c43481e2c93a6eec362b04c3e77a35b28e3) diff --git a/ChangeLog b/ChangeLog index 20d98f0..5ddc3e7 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,5 +1,15 @@ 2019-09-06 Siddhesh Poyarekar =20 + * sysdeps/aarch64/strcmp.S (do_misaligned): Jump back to + do_misaligned, not misaligned8. + +2019-09-06 Siddhesh Poyarekar + + * sysdeps/aarch64/strcmp.S (misaligned8): Compare dword at a + time whenever possible. + +2019-09-06 Siddhesh Poyarekar + * sysdeps/aarch64/memcmp.S: Widen comparison to 16 bytes at a time. =20 diff --git a/sysdeps/aarch64/strcmp.S b/sysdeps/aarch64/strcmp.S index 0b22f16..267aa4b 100644 --- a/sysdeps/aarch64/strcmp.S +++ b/sysdeps/aarch64/strcmp.S @@ -158,7 +158,7 @@ L(do_misaligned): ccmp data1w, data2w, #0, cs /* NZCV =3D 0b0000. */ b.ne L(done) tst src1, #7 - b.ne L(misaligned8) + b.ne L(do_misaligned) =20 L(loop_misaligned): /* Test if we are within the last dword of the end of a 4K page. If