netdev - [PATCH net-next 3/5] ipv6: Optimize ipv6_addr_is_solict

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Date:	Mon, 21 Jan 2013 02:39:07 +0900
From:	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
To:	davem@...emloft.net, netdev@...r.kernel.org
CC:	yoshfuji@...ux-ipv6.org
Subject: [PATCH net-next 3/5] ipv6: Optimize ipv6_addr_is_solict_mult().

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
---
 include/net/addrconf.h |   15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/include/net/addrconf.h b/include/net/addrconf.h
index 3a3eeb4..9dc5efc 100644
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -307,10 +307,17 @@ static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
 
 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
 {
-	return (addr->s6_addr32[0] == htonl(0xff020000) &&
-		addr->s6_addr32[1] == htonl(0x00000000) &&
-		addr->s6_addr32[2] == htonl(0x00000001) &&
-		addr->s6_addr[12] == 0xff);
+#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
+	__u64 *p = (__u64 *)addr;
+	return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
+		((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
+		 cpu_to_be64(0xffffffffff000000UL))) == 0UL;
+#else
+	return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
+		addr->s6_addr32[1] |
+		(addr->s6_addr32[2] ^ htonl(0x00000001)) |
+		(addr->s6_addr[12] ^ 0xff)) == 0;
+#endif
 }
 
 #ifdef CONFIG_PROC_FS
-- 
1.7.9.5


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