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Commit 0f074961 authored by Bryan O'Sullivan's avatar Bryan O'Sullivan Committed by Linus Torvalds
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[PATCH] Add faster __iowrite32_copy routine for x86_64 



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

Signed-off-by: default avatarBryan O'Sullivan <bos@pathscale.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent c27a0d75

arch/x86_64/lib/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -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  \

arch/x86_64/lib/iomap_copy.S

0 → 100644
+26 −0
Original line number Diff line number Diff line 
/*

 * 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