linux-kernel - Re: [PATCH net-next 2/2] reciprocal_divide: correction/update of the algorithm

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Message-ID: <alpine.DEB.2.10.1401161036110.29778@nuc>
Date:	Thu, 16 Jan 2014 10:37:37 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Daniel Borkmann <dborkman@...hat.com>
cc:	davem@...emloft.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Austin S Hemmelgarn <ahferroin7@...il.com>,
	Jesse Gross <jesse@...ira.com>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	Stephen Hemminger <stephen@...workplumber.org>,
	Matt Mackall <mpm@...enic.com>,
	Pekka Enberg <penberg@...nel.org>,
	Andy Gospodarek <andy@...yhouse.net>,
	Veaceslav Falico <vfalico@...hat.com>,
	Jay Vosburgh <fubar@...ibm.com>,
	Jakub Zawadzki <darkjames-ws@...kjames.pl>
Subject: Re: [PATCH net-next 2/2] reciprocal_divide: correction/update of
 the algorithm

On Thu, 16 Jan 2014, Daniel Borkmann wrote:

> - * or else the performance is slower than a normal divide.
> - */
> -extern u32 reciprocal_value(u32 B);
> +struct reciprocal_value {
> +	u32 m;
> +	u8 sh1, sh2;
> +};
>
> +#define RECIPROCAL_VALUE_RESULT_TO_ZERO ((struct reciprocal_value){.sh1 = 32})
>
> -static inline u32 reciprocal_divide(u32 A, u32 R)
> +struct reciprocal_value reciprocal_value(u32 d);

A function that returns a struct? That works? Which gcc versions support
it?


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