linux-kernel - RE: [PATCH] x86: Run checksumming in parallel accross multiple alu's

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Date:	Wed, 30 Oct 2013 12:18:06 -0000
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Neil Horman" <nhorman@...driver.com>,
	"Doug Ledford" <dledford@...hat.com>
Cc:	"Ingo Molnar" <mingo@...nel.org>,
	"Eric Dumazet" <eric.dumazet@...il.com>,
	<linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: RE: [PATCH] x86: Run checksumming in parallel accross multiple alu's

> /me wonders if rearranging the instructions into this order:
> adcq 0*8(src), res1
> adcq 1*8(src), res2
> adcq 2*8(src), res1

Those have to be sequenced.

Using a 64bit lea to add 32bit quantities should avoid the
dependencies on the flags register.
However you'd need to get 3 of those active to beat a 64bit adc.

	David



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