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I'm not 100% sure so this may have to be verified, but i vaguely remember reading once (it was now a long time ago), also that opencl doesn't produce exactly the same result than pure software (a little less good).
Considering that, the fact that to compile with opencl you need to install others third-party "things", the fact that speedup is not realy significant, i personnaly don't compile with opencl in the releases i made, and don't intend to bother with.
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