From: Davidlohr Bueso <dave@stgolabs.net>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Anshul Garg <aksgarg1989@gmail.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
anshul.g@samsung.com
Subject: Re: [PATCH] lib/int_sqrt.c: Optimize square root function
Date: Mon, 02 Feb 2015 20:57:17 -0800 [thread overview]
Message-ID: <1422939437.2293.6.camel@stgolabs.net> (raw)
In-Reply-To: <1422938501.2293.1.camel@stgolabs.net>
On Mon, 2015-02-02 at 20:41 -0800, Davidlohr Bueso wrote:
> On Mon, 2015-02-02 at 11:13 -0800, Linus Torvalds wrote:
> > IOW, instead of
> >
> > m = 1UL << (BITS_PER_LONG - 2);
> >
> > perhaps something like
> >
> > m = 1UL << (BITS_PER_LONG/2- 2);
> > if (m < x)
> > m <<= BITS_PER_LONG/2;
Assuming small values mostly, we could also try more aggressive
estimators for BITS_PER_LONG == 64. But then again, it probably doesn't
matter.
next prev parent reply other threads:[~2015-02-03 4:57 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
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 [this message]
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
-- strict thread matches above, loose matches on Subject: below --
2015-01-29 13:35 Anshul Garg
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