More ergonomic way to access builtin kernels with weird names.

[jansol]

Sorry for the double post, figured this deserves its own tracking issue. Continuing from #777:

bik_prg = cl.create_program_with_built_in_kernels(ctx, [devices[0]], ["pocl.add.i8"])
bik_prg.build()
for k in bik_prg.all_kernels():
    name = k.get_info(cl.kernel_info.FUNCTION_NAME)
    if name == "pocl.add.i8":
        bik_knl = k
bik_knl(queue, a_np.shape, None, a_g, b_g, bikres_g)

Fetching the kernel via the kernel_name attribute is not possible since the builtin kernel name gets mangled by pyopencl to "pocladdi8" but it seems kernel_name gets passed as is to clCreateKernel which of course fails in this case since it expects "pocl.add.i8". Something like an __getitem__(self, kernel_name) or a helper function to fetch kernels by (string) name would be nice.

[inducer]

cl.Kernel(bik_prg, "pocl.add.i8") should work. Does that do the trick for you?

It's documented here, but that's arguably not very discoverable. I'll add a note to the docs.

[inducer]

BTW: k.get_info(cl.kernel_info.FUNCTION_NAME) could be k.function_name I think.

[jansol]

BTW: k.get_info(cl.kernel_info.FUNCTION_NAME) could be k.function_name I think.

Ohh, I see, I've mis-parsed the info section then. That does indeed make more sense. I'll give the constructor a try tomorrow, that should indeed do it.

[jansol]

Yep, the constructor is as good as it gets. Thanks for the docs clarification!