From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755321AbZCLKqp (ORCPT ); Thu, 12 Mar 2009 06:46:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752056AbZCLKqg (ORCPT ); Thu, 12 Mar 2009 06:46:36 -0400 Received: from vpn.id2.novell.com ([195.33.99.129]:32693 "EHLO vpn.id2.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751499AbZCLKqg convert rfc822-to-8bit (ORCPT ); Thu, 12 Mar 2009 06:46:36 -0400 Message-Id: <49B8F641.76E4.0078.0@novell.com> X-Mailer: Novell GroupWise Internet Agent 8.0.0 Date: Thu, 12 Mar 2009 10:47:13 +0000 From: "Jan Beulich" To: , , Cc: Subject: [PATCH] x86-64: remove unnecessary spill/reload of rbx from memcpy Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 8BIT Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This should slightly improve its performance. Signed-off-by: Jan Beulich --- arch/x86/lib/memcpy_64.S | 7 ------- 1 file changed, 7 deletions(-) --- linux-2.6.29-rc7/arch/x86/lib/memcpy_64.S 2008-01-24 23:58:37.000000000 +0100 +++ 2.6.29-rc7-x86_64-memcpy-rbx/arch/x86/lib/memcpy_64.S 2008-12-18 10:58:11.000000000 +0100 @@ -33,9 +33,6 @@ ENDPROC(memcpy_c) ENTRY(__memcpy) ENTRY(memcpy) CFI_STARTPROC - pushq %rbx - CFI_ADJUST_CFA_OFFSET 8 - CFI_REL_OFFSET rbx, 0 movq %rdi,%rax movl %edx,%ecx @@ -102,11 +99,7 @@ ENTRY(memcpy) jnz .Lloop_1 .Lende: - popq %rbx - CFI_ADJUST_CFA_OFFSET -8 - CFI_RESTORE rbx ret -.Lfinal: CFI_ENDPROC ENDPROC(memcpy) ENDPROC(__memcpy)