lkml.org 
[lkml]   [2007]   [Aug]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH] i386: optimize memset of 6 and 8 bytes
Tne network code does memset for 6 and 8 byte values, that can easily
be optimized into simple assignments without string instructions.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>


--- a/include/asm-i386/string.h 2007-08-17 15:14:37.000000000 -0700
+++ b/include/asm-i386/string.h 2007-08-17 16:49:10.000000000 -0700
@@ -228,6 +228,14 @@ static __always_inline void * __constant
case 4:
*(unsigned long *)s = pattern;
return s;
+ case 6:
+ *(unsigned long *)s = pattern;
+ *(2+(unsigned short *)s) = pattern;
+ return s;
+ case 8:
+ *(unsigned long *)s = pattern;
+ *(1+(unsigned long *)s) = pattern;
+ return s;
}
#define COMMON(x) \
__asm__ __volatile__( \
-
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: 2007-08-18 01:53    [from the cache]
©2003-2011 Jasper Spaans