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 > > Content of type "text/html" skipped
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