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Message-ID: <9553bfda7b9519bbdbcd1c35e66ecb22@smtp.hushmail.com>
Date: Fri, 20 Apr 2012 22:01:44 +0200
From: magnum <john.magnum@...hmail.com>
To: john-dev@...ts.openwall.com
Subject: Re: Pragma unroll
On 04/20/2012 09:55 PM, Milen Rangelov wrote:
> I would rather avoid pragma unroll too unless you stick to SDK 2.6. APP SDK
> 2.5 has many problems with this. Though anyway, even if working correctly,
> it tends to be counterproductive in many cases. You need to do very careful
> profiling. Often less conditionals just can't compete with less occupancy
> due to GPR usage. And loop unrolling can easily increase GPR utilization
> beyond what you expected.
OK that, but if we do see a performance boost from an unroll, then it's
all fine and dandy, no?
magnum
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