lkml.org 
[lkml]   [2006]   [Jan]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Subject[PATCH 2 of 2] __raw_memcpy_toio32 for x86_64
Date
From
Introduce an x86_64-specific __raw_memcpy_toio32 routine.  This is
measurably faster than the generic version in lib/raw_memcpy_io.c.

Signed-off-by: Bryan O'Sullivan <bos@pathscale.com>

diff -r cd6d8a62dad5 -r f03a807a80b8 arch/x86_64/lib/Makefile
--- a/arch/x86_64/lib/Makefile Wed Jan 11 16:25:30 2006 -0800
+++ b/arch/x86_64/lib/Makefile Wed Jan 11 16:26:59 2006 -0800
@@ -4,7 +4,7 @@

CFLAGS_csum-partial.o := -funroll-loops

-obj-y := io.o
+obj-y := io.o raw_memcpy_io.o

lib-y := csum-partial.o csum-copy.o csum-wrappers.o delay.o \
usercopy.o getuser.o putuser.o \
diff -r cd6d8a62dad5 -r f03a807a80b8 arch/x86_64/lib/raw_memcpy_io.S
--- /dev/null Thu Jan 1 00:00:00 1970 +0000
+++ b/arch/x86_64/lib/raw_memcpy_io.S Wed Jan 11 16:26:59 2006 -0800
@@ -0,0 +1,29 @@
+/*
+ * 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/raw_memcpy_io.c
+ */
+ .globl __raw_memcpy_toio32
+__raw_memcpy_toio32:
+ movl %edx,%ecx
+ shrl $1,%ecx
+ andl $1,%edx
+ rep movsq
+ movl %edx,%ecx
+ rep movsd
+ ret
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
\
 
 \ /
  Last update: 2006-01-12 01:34    [W:0.057 / U:0.076 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site