From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steffen Klassert Subject: [PATCH 4/4] xfrm: branchless addr4_match() on 64-bit Date: Tue, 11 Apr 2017 07:53:52 +0200 Message-ID: <1491890032-28655-5-git-send-email-steffen.klassert@secunet.com> References: <1491890032-28655-1-git-send-email-steffen.klassert@secunet.com> Mime-Version: 1.0 Content-Type: text/plain Cc: Herbert Xu , Steffen Klassert , To: David Miller Return-path: Received: from a.mx.secunet.com ([62.96.220.36]:56586 "EHLO a.mx.secunet.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752291AbdDKGAD (ORCPT ); Tue, 11 Apr 2017 02:00:03 -0400 In-Reply-To: <1491890032-28655-1-git-send-email-steffen.klassert@secunet.com> Sender: netdev-owner@vger.kernel.org List-ID: From: Alexey Dobriyan Current addr4_match() code has special test for /0 prefixes because of standard required undefined behaviour. However, it is possible to omit it on 64-bit because shifting can be done within a 64-bit register and then truncated to the expected value (which is 0 mask). Implicit truncation by htonl() fits nicely into R32-within-R64 model on x86-64. Space savings: none (coincidence) Branch savings: 1 Before: movzx eax,BYTE PTR [rdi+0x2a] # ->prefixlen_d test al,al jne xfrm_selector_match + 0x23f ... movzx eax,BYTE PTR [rbx+0x2b] # ->prefixlen_s test al,al je xfrm_selector_match + 0x1c7 After (no branches): mov r8d,0x20 mov rdx,0xffffffffffffffff mov esi,DWORD PTR [rsi+0x2c] mov ecx,r8d sub cl,BYTE PTR [rdi+0x2a] xor esi,DWORD PTR [rbx] mov rdi,rdx xor eax,eax shl rdi,cl bswap edi Signed-off-by: Alexey Dobriyan Signed-off-by: Steffen Klassert --- include/net/xfrm.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/include/net/xfrm.h b/include/net/xfrm.h index 43b93d1..9e3dc7b 100644 --- a/include/net/xfrm.h +++ b/include/net/xfrm.h @@ -845,9 +845,9 @@ static inline bool addr_match(const void *token1, const void *token2, static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen) { /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */ - if (prefixlen == 0) + if (sizeof(long) == 4 && prefixlen == 0) return true; - return !((a1 ^ a2) & htonl(0xFFFFFFFFu << (32 - prefixlen))); + return !((a1 ^ a2) & htonl(~0UL << (32 - prefixlen))); } static __inline__ -- 2.7.4