double16 and cl_khr_fp64

[sctincman]

Are there currently any plans to implement some of the more standard extensions?

Specifically, I was wondering about cl_khr_fp64 (needed for some scientific kernels).

It appears that double2, double4, and double8 are implemented already, which means this is just missing double16. The only platform supported that does not have double precision is the Epiphany, I think, and in that case e-gcc does support soft emulation.