From owner-svn-src-stable-12@freebsd.org Wed Nov 25 18:36:39 2020 Return-Path: Delivered-To: svn-src-stable-12@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 3B6814717CC; Wed, 25 Nov 2020 18:36:39 +0000 (UTC) (envelope-from emaste@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4Ch8jz1Gv8z3s1W; Wed, 25 Nov 2020 18:36:39 +0000 (UTC) (envelope-from emaste@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 1E8E515BA9; Wed, 25 Nov 2020 18:36:39 +0000 (UTC) (envelope-from emaste@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 0APIadFO053899; Wed, 25 Nov 2020 18:36:39 GMT (envelope-from emaste@FreeBSD.org) Received: (from emaste@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 0APIacIP053898; Wed, 25 Nov 2020 18:36:38 GMT (envelope-from emaste@FreeBSD.org) Message-Id: <202011251836.0APIacIP053898@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: emaste set sender to emaste@FreeBSD.org using -f From: Ed Maste Date: Wed, 25 Nov 2020 18:36:38 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r368027 - stable/12/lib/libc/string X-SVN-Group: stable-12 X-SVN-Commit-Author: emaste X-SVN-Commit-Paths: stable/12/lib/libc/string X-SVN-Commit-Revision: 368027 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-stable-12@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: SVN commit messages for only the 12-stable src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 25 Nov 2020 18:36:39 -0000 Author: emaste Date: Wed Nov 25 18:36:38 2020 New Revision: 368027 URL: https://svnweb.freebsd.org/changeset/base/368027 Log: MFC r351700: libc: Use musl's optimized memchr Parentheses added to HASZERO macro to avoid a GCC warning. Sponsored by: The FreeBSD Foundation Modified: stable/12/lib/libc/string/memchr.c Directory Properties: stable/12/ (props changed) Modified: stable/12/lib/libc/string/memchr.c ============================================================================== --- stable/12/lib/libc/string/memchr.c Wed Nov 25 18:09:01 2020 (r368026) +++ stable/12/lib/libc/string/memchr.c Wed Nov 25 18:36:38 2020 (r368027) @@ -1,55 +1,54 @@ /*- - * SPDX-License-Identifier: BSD-3-Clause + * SPDX-License-Identifier: MIT * - * Copyright (c) 1990, 1993 - * The Regents of the University of California. All rights reserved. + * Copyright (c) 2005-2014 Rich Felker, et al. * - * This code is derived from software contributed to Berkeley by - * Chris Torek. + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. + * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY + * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, + * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE + * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ - -#if defined(LIBC_SCCS) && !defined(lint) -static char sccsid[] = "@(#)memchr.c 8.1 (Berkeley) 6/4/93"; -#endif /* LIBC_SCCS and not lint */ #include __FBSDID("$FreeBSD$"); #include +#include +#include -void * -memchr(const void *s, int c, size_t n) -{ - if (n != 0) { - const unsigned char *p = s; +#define SS (sizeof(size_t)) +#define ALIGN (sizeof(size_t)-1) +#define ONES ((size_t)-1/UCHAR_MAX) +#define HIGHS (ONES * (UCHAR_MAX/2+1)) +#define HASZERO(x) (((x)-ONES) & ~(x) & HIGHS) - do { - if (*p++ == (unsigned char)c) - return ((void *)(p - 1)); - } while (--n != 0); +void *memchr(const void *src, int c, size_t n) +{ + const unsigned char *s = src; + c = (unsigned char)c; +#ifdef __GNUC__ + for (; ((uintptr_t)s & ALIGN) && n && *s != c; s++, n--); + if (n && *s != c) { + typedef size_t __attribute__((__may_alias__)) word; + const word *w; + size_t k = ONES * c; + for (w = (const void *)s; n>=SS && !HASZERO(*w^k); w++, n-=SS); + s = (const void *)w; } - return (NULL); +#endif + for (; n && *s != c; s++, n--); + return n ? (void *)s : 0; }