From: Anshul Garg <aksgarg1989@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: aksgarg1989@gmail.com, anshul.g@samsung.com
Subject: [PATCH] lib/int_sqrt.c: Optimize square root function
Date: Thu, 29 Jan 2015 05:35:25 -0800 [thread overview]
Message-ID: <1422538525-87669-1-git-send-email-aksgarg1989@gmail.com> (raw)
In-Reply-To: <aksgarg1989@gmail.com>
From: Anshul Garg <aksgarg1989@gmail.com>
Unnecessary instructions are executing even though m is
greater than x so added logic to make m less than equal to
x before performing these operations.
Signed-off-by: Anshul Garg <aksgarg1989@gmail.com>
---
lib/int_sqrt.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/lib/int_sqrt.c b/lib/int_sqrt.c
index 1ef4cc3..64ae722 100644
--- a/lib/int_sqrt.c
+++ b/lib/int_sqrt.c
@@ -22,6 +22,9 @@ unsigned long int_sqrt(unsigned long x)
return x;
m = 1UL << (BITS_PER_LONG - 2);
+
+ while (m > x)
+ m >>= 2;
while (m != 0) {
b = y + m;
y >>= 1;
--
1.7.9.5
---
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next reply other threads:[~2015-01-29 13:36 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-29 13:35 Anshul Garg [this message]
2015-02-02 17:12 [PATCH] lib/int_sqrt.c: Optimize square root function Anshul Garg
2015-02-02 19:00 ` Linus Torvalds
2015-02-02 19:13 ` Linus Torvalds
2015-02-03 4:41 ` Davidlohr Bueso
2015-02-03 4:57 ` Davidlohr Bueso
2015-02-03 15:54 ` Anshul Garg
2017-07-20 11:24 ` Peter Zijlstra
2017-07-20 11:52 ` Joe Perches
2017-07-20 14:13 ` Peter Zijlstra
2017-07-20 15:27 ` Peter Zijlstra
2017-07-20 18:31 ` Linus Torvalds
2017-07-20 22:34 ` Peter Zijlstra
2017-07-20 23:24 ` Linus Torvalds
2017-07-21 11:40 ` Peter Zijlstra
2017-07-21 12:15 ` Joe Perches
2017-07-21 13:26 ` Peter Zijlstra
2017-07-21 13:33 ` Peter Zijlstra
2015-02-03 4:47 ` Davidlohr Bueso
2015-02-03 15:42 ` Anshul Garg
2015-02-05 18:20 ` Linus Torvalds
2015-02-05 18:33 ` Linus Torvalds
2015-02-05 18:43 ` Anshul Garg
2015-02-05 19:37 ` Linus Torvalds
2015-02-08 15:39 ` Anshul Garg
2015-02-02 19:10 ` Joe Perches
2015-02-02 19:39 ` Linus Torvalds
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