The biggest issue I think is utilizing massive GPU memory bandwidth, you really need SIMD or your GPU is just going to generate a lot of heat to do only a bit of work.
But SIMD has got nothing to do with language per se. In Erlang everything is in a module and hence i can imagine annotating a module with SIMD/SIMT attribute which would then be the hint for the ERTS to map all the processes in that module to a warp on a GPU using SIMD vectorization as needed. Of course my Erlang processes must be written to take advantage of the above and thus cannot be a general-purpose (i.e. MIMD) process.
