From: Peter Zijlstra <peterz@infradead.org>
To: David Laight <David.Laight@ACULAB.COM>
Cc: "'Crt Mori'" <cmo@melexis.com>,
Jonathan Cameron <jic23@kernel.org>,
Ingo Molnar <mingo@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Kees Cook <keescook@chromium.org>,
Rusty Russell <rusty@rustcorp.com.au>,
Ian Abbott <abbotti@mev.co.uk>,
Larry Finger <Larry.Finger@lwfinger.net>,
Niklas Soderlund <niklas.soderlund+renesas@ragnatech.se>,
Thomas Gleixner <tglx@linutronix.de>,
Krzysztof Kozlowski <krzk@kernel.org>,
Masahiro Yamada <yamada.masahiro@socionext.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-iio@vger.kernel.org" <linux-iio@vger.kernel.org>,
Joe Perches <joe@perches.com>
Subject: Re: [PATCH v10 1/3] lib: Add strongly typed 64bit int_sqrt
Date: Wed, 20 Dec 2017 17:00:01 +0100 [thread overview]
Message-ID: <20171220160001.manjff26gfbjccsw@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <1c1d0ffa8ee140bf9adbc78f1559b1e8@AcuMS.aculab.com>
On Wed, Dec 20, 2017 at 02:39:26PM +0000, David Laight wrote:
> With minor changes it ought to be possible to remove most of the
> 64bit arithmetic and shifts.
>
> If you care about performance then using 32 bit maths will be much faster.
Some, u64 add/sub/shift isn't exactly expensive, but yes, I also
indicated that improvement is possible. At the very least y can be made
a u32 I suppose.
next prev parent reply other threads:[~2017-12-20 16:00 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-20 14:20 [PATCH v10 1/3] lib: Add strongly typed 64bit int_sqrt Crt Mori
2017-12-20 14:39 ` David Laight
2017-12-20 15:41 ` Crt Mori
2017-12-20 16:00 ` Peter Zijlstra [this message]
2017-12-20 16:17 ` Crt Mori
2017-12-20 16:46 ` David Laight
2017-12-20 17:19 ` Joe Perches
2017-12-21 10:02 ` David Laight
2017-12-20 17:30 ` Crt Mori
2017-12-21 10:08 ` David Laight
2017-12-21 10:59 ` David Laight
2017-12-21 11:43 ` David Laight
2017-12-21 13:17 ` Crt Mori
2017-12-21 13:56 ` David Laight
2017-12-21 14:11 ` Peter Zijlstra
2017-12-21 14:48 ` David Laight
2017-12-22 13:44 ` Crt Mori
2018-01-09 15:18 ` Crt Mori
2018-01-12 9:41 ` David Laight
2018-01-15 8:17 ` Crt Mori
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