linux-kernel - [PATCH] lib: One less subtraction in binary search iterations.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Sat,  6 Jul 2013 16:07:42 -0700
From:	Wedson Almeida Filho <wedsonaf@...il.com>
To:	Rusty Russell <rusty@...tcorp.com.au>,
	Tim Abbott <tabbott@...lice.com>
Cc:	linux-kernel@...r.kernel.org,
	Wedson Almeida Filho <wedsonaf@...il.com>
Subject: [PATCH] lib: One less subtraction in binary search iterations.

There is no functional change, but this change eliminates a subtraction that
the compiler doesn't optimize out (as of gcc 4.7.3).

Signed-off-by: Wedson Almeida Filho <wedsonaf@...il.com>
---
 lib/bsearch.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/bsearch.c b/lib/bsearch.c
index e33c179..3264146 100644
--- a/lib/bsearch.c
+++ b/lib/bsearch.c
@@ -37,7 +37,7 @@ void *bsearch(const void *key, const void *base, size_t num, size_t size,
 	int result;
 
 	while (start < end) {
-		size_t mid = start + (end - start) / 2;
+		size_t mid = (start + end) / 2;
 
 		result = cmp(key, base + mid * size);
 		if (result < 0)
-- 
1.7.9.5

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/