[acdha]

> SSE intrinsics - my experience was that Microsoft's compiler was MUCH better at generating code from SSE/SSE2 intrinsics then clang

I don't know whether this is still the case – or something like tweaking the target CPUs would help – but assuming it is, did you report it to either the open-source Clang project or Apple? The developers have seemed to be quite responsive to reports like this.

[lmolnar]

I did not, I just #ifdef-ed that code out of the Mac port. I'll review what I've done again and follow-up with the Clang people.