Date: Mon, 21 Oct 2013 21:33:47 +0200 From: magnum <john.magnum@...hmail.com> To: "john-dev@...ts.openwall.com" <john-dev@...ts.openwall.com> Subject: Re: OpenCL vectorizing how-to. On 2013-10-19 00:42, magnum wrote: > I'm looking forward to see how eg. wpapsk-opencl performs now on the > Xeon Phi. Unless its driver rather auto-vectorizes of course :-/ While doing a more or less unrelated search on coalescing I stumbled upon this: http://software.intel.com/en-us/articles/opencl-design-and-programming-guide-for-the-intel-xeon-phi-coprocessor Xeon Phi's compiler indeed wants scalar code. BTW I thought only some models of Xeon Phi were 512-bit width but this paper seem to indicate they all are (but may be wider in future). One thing I can't understand is why pre-vectorized code with the correct width is not used "as-is" by these compilers. Apparently the compiler first scalarizes it and then re-vectorizes it - with very poor results, at least on Well. OTOH this isn't a problem now that we can supply the requested [lack of] width. magnum
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