linux-kernel - Re: [PATCH v2 2/3] lib: Introduce 2 bit ops api: all_is_bit

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Message-Id: <265F6375-198E-4D74-8915-81E3995B7D4D@gmail.com>
Date:	Thu, 19 Nov 2015 16:49:51 +0800
From:	yalin wang <yalin.wang2010@...il.com>
To:	Jia He <hejianet@...il.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Linux-Arch <linux-arch@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Yury Norov <yury.norov@...il.com>, Tejun Heo <tj@...nel.org>,
	Martin Kepplinger <martink@...teo.de>,
	George Spelvin <linux@...izon.com>,
	Ingo Molnar <mingo@...nel.org>, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v2 2/3] lib: Introduce 2 bit ops api: all_is_bit_{one,zero}


> On Nov 19, 2015, at 14:48, Jia He <hejianet@...il.com> wrote:
> 
> 
why not use memcmp() to compare with  0x0000000 or 0xffffffff  ?
memcmp() have better performance on some platforms .

Thanks

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