convert_double function unimplemented on GPU

[Lubomir_A_]

The following code fails to compile:

kernel void f2(global double* W)
{
    uint w;
    convert_double(w);
}

The error is: Error, unimplemented function called: _Z14convert_doublej()

[Lubomir_A_]

The regular conversion operator (double) also gives this message. This is with the 2014 SDK, on Intel HD 4000.

[Robert_I_Intel]

Lubomir,

We currently don't support cl_khr_fp64 extension, which enables doubles support. There hardware actually supports doubles, so there are internal discussions going on about enabling doubles support in the future