[BMarkmann]

Oh wow, hard numbers, thanks! That's very impressive, but strangely misleading in the graph towards the bottom that appears to clock TAIL->Futhark->OpenCL and Futhark->OpenCL exactly the same in more than half the cases (if you look at the raw numbers if appears that the second approach blows the first away in most).

[Athas]

That's because the speedup graph cuts away at a 100x speedup, but some of these (somewhat silly) benchmarks are compute-bound and hence gets these crazy 1000x speedups on the GPU.