From patchwork Mon Mar 7 20:57:35 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Lu, Hongjiu" X-Patchwork-Id: 11246 Received: (qmail 38527 invoked by alias); 7 Mar 2016 20:57:47 -0000 Mailing-List: contact libc-alpha-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: libc-alpha-owner@sourceware.org Delivered-To: mailing list libc-alpha@sourceware.org Received: (qmail 38517 invoked by uid 89); 7 Mar 2016 20:57:47 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-0.2 required=5.0 tests=AWL, BAYES_00, KAM_LAZY_DOMAIN_SECURITY, NO_DNS_FOR_FROM, RP_MATCHES_RCVD autolearn=no version=3.3.2 spammy=Hx-languages-length:1048, duplicated, H*R:D*gmail.com X-HELO: mga14.intel.com X-ExtLoop1: 1 Date: Mon, 7 Mar 2016 12:57:35 -0800 From: "H.J. Lu" To: GNU C Library Subject: [PATCH] Define _HAVE_STRING_ARCH_mempcpy to 1 for x86 Message-ID: <20160307205735.GA3204@intel.com> Reply-To: "H.J. Lu" MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.5.24 (2015-08-30) Since x86 has an optimized mempcpy and GCC can inline mempcpy on x86, define _HAVE_STRING_ARCH_mempcpy to 1 for x86. If duplicated code between optimized memcpy and mempcpy is a concern, we can add an entry point in memcpy and use it to implement mempcpy, similar to the set of patches for __mempcpy_sse2_unaligned: https://sourceware.org/ml/libc-alpha/2016-03/msg00166.html OK for master? H.J. --- [BZ #19759] * sysdeps/x86/bits/string.h (_HAVE_STRING_ARCH_mempcpy): New. --- sysdeps/x86/bits/string.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/sysdeps/x86/bits/string.h b/sysdeps/x86/bits/string.h index e4e019f..f5885b4 100644 --- a/sysdeps/x86/bits/string.h +++ b/sysdeps/x86/bits/string.h @@ -62,6 +62,9 @@ | ((const unsigned char *) (src))[idx]) +/* Don't inline mempcpy into memcpy as x86 has an optimized mempcpy. */ +# define _HAVE_STRING_ARCH_mempcpy 1 + /* Copy N bytes of SRC to DEST. */ # define _HAVE_STRING_ARCH_memcpy 1 # define memcpy(dest, src, n) \