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Date: Sat, 24 Mar 2012 23:24:40 +0100
From: magnum <john.magnum@...hmail.com>
To: john-dev@...ts.openwall.com
Subject: OpenCL vector tactics
Could someone brave tell me why/how/if to use vector types like uint4 in
OpenCL kernels? I do understand sse2 intrinsics, like sse-intrinsics.c
in john, but as far as I understand, that does not translate well to
OpenCL. I don't quite get how to apply vectors to OpenCL.
How would I attack it? Would each kernel do four inputs and produce four
outputs? If I have an existing kernel that does one input and ends up
with one output, should I just convert it to do four things at a time
for every move it makes, just like sse2 intrinsics? Just like that? And
if so, what would I set as local workgroup size? The real size divided
by four?
And what would this accomplish? Did I understand right that this would
benefit CPUs and perhaps AMD GPUs but likely not nvidia? Would it be
detrimental for nvidia?
magnum
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