opencl diffs

[jenshannoschwalm]

It would be nice to have the opencl vs cpu diffs too. We could use pocl for that, not sure if the host system would support that and we would have to enable pocl somehow.

[TurboGit]

Sadly my host running the testsuite has no hardware supporting OpenCL.

[jenshannoschwalm]

We might try to enable/use pocl for that, its an implementation running also on plain cpu.