The transfer overhead would only need to happen once if there's a sequence of GPU-able primitives, though. The dataflow analysis for that isn't too hard. I'll

The transfer overhead would only need to happen once if there's a sequence of GPU-able primitives, though. The dataflow analysis for that isn't too hard. I'll check ispc out too, thanks. My fork* is using some SSE, via GCC-specific extensions (http://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html http://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html). It could be special-cased into Kona as-is, but I've found a better way to implement scalars than the elaborate preprocessor hack I did there. (Besides, tuning the reference counting would probably have a bigger impact, something like Deutsch-Bobrow at least.) * It's not on github, yet; I don't usually post things there until they're reasonably usable end-to-end. My kona fork is mostly for pull requests; I'm talking about a completely new implementation. Would you like to continue this discussion off HN? My contact info is in my profile.