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Message-ID: <CABh=JRG4gJRmgsSZRnZUNuewBzTDL-wEE6BU5uxQ1TXWUD22sw@mail.gmail.com>
Date: Fri, 20 Apr 2012 23:09:30 +0300
From: Milen Rangelov <gat3way@...il.com>
To: john-dev@...ts.openwall.com
Subject: Re: Pragma unroll
Yeah, I've occasionally seen profits from it. Generally phpass may benefit
from it for example because iterations are simple.
On Fri, Apr 20, 2012 at 11:01 PM, magnum <john.magnum@...hmail.com> wrote:
> 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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