From: Dan Pop <Dan.Pop@cern.ch>
To: linux-ia64@vger.kernel.org
Subject: Re: [Linux-ia64] Bitcount ?
Date: Sat, 17 Jun 2000 21:07:12 +0000 [thread overview]
Message-ID: <marc-linux-ia64-105590678205162@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-105590678205161@msgid-missing>
On Sat, 17 Jun 2000, Dimo Dimitrov-DataManagement wrote:
> I need an algoritm to do bitcount across an array, which ran in less than a
> cycle/byte on IA32/IA64.
> I have written an algoritm for bit-parallel adition, and the best time wich
> I get is ~1.4 c/b.
I'm not sure I've understood what exactly your problem is, but did you
look at the popcnt instruction?
Dan
prev parent reply other threads:[~2000-06-17 21:07 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-06-17 11:12 [Linux-ia64] Bitcount ? Dimo Dimitrov-DataManagement
2000-06-17 21:07 ` Dan Pop [this message]
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