From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 14853 invoked by alias); 9 Jun 2013 08:13:15 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org Received: (qmail 14813 invoked by uid 48); 9 Jun 2013 08:13:10 -0000 From: "yiyi8761 at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/57571] linux kernel function memcpy() execute with low efficiency on Intel Ivybridge platform Date: Sun, 09 Jun 2013 08:13:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: target X-Bugzilla-Version: 4.7.2 X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: normal X-Bugzilla-Who: yiyi8761 at gmail dot com X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2013-06/txt/msg00433.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57571 --- Comment #3 from phoenix --- 1. "Can you provide the preprocessed source" Sorry,I trace the linux source code, the kernel used __builtin___memcpy() to replace memcpy(). I can't find the __builtin___memcpy() source code in the linux source code. It seems it is processed by GCC. 2. "the kernel is not generating memcpy at runtime?" Could you give me a little explanation about this? Thank you very much!