From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756494AbZCLL6z (ORCPT ); Thu, 12 Mar 2009 07:58:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756057AbZCLL61 (ORCPT ); Thu, 12 Mar 2009 07:58:27 -0400 Received: from hera.kernel.org ([140.211.167.34]:59740 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755836AbZCLL60 (ORCPT ); Thu, 12 Mar 2009 07:58:26 -0400 Date: Thu, 12 Mar 2009 11:57:45 GMT From: Jan Beulich To: linux-tip-commits@vger.kernel.org Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@redhat.com, jbeulich@novell.com, tglx@linutronix.de, mingo@elte.hu Reply-To: mingo@redhat.com, hpa@zytor.com, linux-kernel@vger.kernel.org, jbeulich@novell.com, tglx@linutronix.de, mingo@elte.hu In-Reply-To: <49B8F641.76E4.0078.0@novell.com> References: <49B8F641.76E4.0078.0@novell.com> Subject: [tip:x86/asm] x86-64: remove unnecessary spill/reload of rbx from memcpy Message-ID: Git-Commit-ID: dd1ef4ec4721ddc0a1f2b73a4f67930cb320665c X-Mailer: tip-git-log-daemon MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.0 (hera.kernel.org [127.0.0.1]); Thu, 12 Mar 2009 11:57:47 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: dd1ef4ec4721ddc0a1f2b73a4f67930cb320665c Gitweb: http://git.kernel.org/tip/dd1ef4ec4721ddc0a1f2b73a4f67930cb320665c Author: "Jan Beulich" AuthorDate: Thu, 12 Mar 2009 10:47:13 +0000 Commit: Ingo Molnar CommitDate: Thu, 12 Mar 2009 12:04:47 +0100 x86-64: remove unnecessary spill/reload of rbx from memcpy Impact: micro-optimization This should slightly improve its performance. Signed-off-by: Jan Beulich LKML-Reference: <49B8F641.76E4.0078.0@novell.com> Signed-off-by: Ingo Molnar --- arch/x86/lib/memcpy_64.S | 7 ------- 1 files changed, 0 insertions(+), 7 deletions(-) diff --git a/arch/x86/lib/memcpy_64.S b/arch/x86/lib/memcpy_64.S index c22981f..10c0676 100644 --- a/arch/x86/lib/memcpy_64.S +++ b/arch/x86/lib/memcpy_64.S @@ -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)