[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 <[email protected]>


--- 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 [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

---

• Follow-Ups:
  • Re: [PATCH] i386: optimize memset of 6 and 8 bytes
    • From: Arjan van de Ven <[email protected]>

• Prev by Date: Re: kfree(0) - ok?
• Next by Date: Re: [PATCH 0/24] make atomic_read() behave consistently across all architectures
• Previous by thread: [PATCH] x86-64: memset optimization
• Next by thread: Re: [PATCH] i386: optimize memset of 6 and 8 bytes
• Index(es):
  • Date
  • Thread

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]