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[PATCH] Add faster __iowrite32_copy routine for x86_64

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This assembly version is measurably faster than the generic version in
lib/iomap_copy.c.

Signed-off-by: Bryan O'Sullivan <bos@pathscale.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Bryan O'Sullivan 2006-02-01 03:05:17 -08:00 committed by Linus Torvalds
parent c27a0d75b3
commit 0f07496144
2 changed files with 27 additions and 1 deletions
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2
arch/x86_64/lib/Makefile
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@ -4,7 +4,7 @@
CFLAGS_csum-partial.o := -funroll-loops
obj-y := io.o
obj-y := io.o iomap_copy.o
lib-y := csum-partial.o csum-copy.o csum-wrappers.o delay.o \
usercopy.o getuser.o putuser.o \

26
arch/x86_64/lib/iomap_copy.S Normal file
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@ -0,0 +1,26 @@
/*
* Copyright 2006 PathScale, Inc. All Rights Reserved.
*
* This file is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/*
* override generic version in lib/iomap_copy.c
*/
.globl __iowrite32_copy
.p2align 4
__iowrite32_copy:
movl %edx,%ecx
rep movsd
ret