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Date: Fri, 17 Aug 2007 16:50:30 -0700 From: Stephen Hemminger <shemminger@...ux-foundation.org> To: "David S. Miller" <davem@...emloft.net>, Andrew Morton <akpm@...ux-foundation.org> Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org 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@...ux-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 netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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