[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: 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>
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@ -4,7 +4,7 @@
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CFLAGS_csum-partial.o := -funroll-loops
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obj-y := io.o
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obj-y := io.o iomap_copy.o
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lib-y := csum-partial.o csum-copy.o csum-wrappers.o delay.o \
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usercopy.o getuser.o putuser.o \
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26
arch/x86_64/lib/iomap_copy.S
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26
arch/x86_64/lib/iomap_copy.S
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@ -0,0 +1,26 @@
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/*
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* Copyright 2006 PathScale, Inc. All Rights Reserved.
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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/*
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* override generic version in lib/iomap_copy.c
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*/
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.globl __iowrite32_copy
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.p2align 4
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__iowrite32_copy:
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movl %edx,%ecx
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rep movsd
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ret
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