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authorBryan O'Sullivan <bos@pathscale.com>2006-02-01 03:05:17 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-01 08:53:13 -0800
commit0f07496144c270f10d0ad06b70b9c9387d5527fd (patch)
tree33d00ef050b2b63d1033357113fcc6eae589e40a /arch/x86_64/lib
parentc27a0d75b33c030965cc97d3d7f571107a673fb4 (diff)
downloadlinux-linaro-stable-0f07496144c270f10d0ad06b70b9c9387d5527fd.tar.gz
[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>
Diffstat (limited to 'arch/x86_64/lib')
-rw-r--r--arch/x86_64/lib/Makefile2
-rw-r--r--arch/x86_64/lib/iomap_copy.S26
2 files changed, 27 insertions, 1 deletions
diff --git a/arch/x86_64/lib/Makefile b/arch/x86_64/lib/Makefile
index bba5db6cebd6..ccef6ae747a3 100644
--- a/arch/x86_64/lib/Makefile
+++ b/arch/x86_64/lib/Makefile
@@ -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 \
diff --git a/arch/x86_64/lib/iomap_copy.S b/arch/x86_64/lib/iomap_copy.S
new file mode 100644
index 000000000000..8bbade5fea05
--- /dev/null
+++ b/arch/x86_64/lib/iomap_copy.S
@@ -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