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For example, implement: http://cas.ee.ic.ac.uk/people/dt10/research/rngs-gpu-mwc64x.html
What about the CURAND library?
CURAND (http://docs.nvidia.com/cuda/curand/index.html) is also a good candidate.
In general, one problem is that people are likely to want different random number generators depending on their application.
I have begun building the accelerate-random package. Currently this just provides an interface to generating arrays of random numbers on the host, rather than in Acc code.