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

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Message-Id: <1373152062-28164-1-git-send-email-wedsonaf@gmail.com>
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

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