isequal is only defined on float values

[he-sk]

On the latest Intel OpenCL (18.1.0.013, installed through System Studio 2019), the kernels build_vec and probe_vec do not compile anymore.

According to the OpenCL specification, the builtin isequal is only defined for float types [1]. (It did work on integer types in previous versions.) It has to be replaced with a normal == operator.

See for example here:

OpenCL-SIMD-hashing/cpu-opencl/src/probe_vec.cl

Line 262 in b1c7e5c

inv = isequal(h_key, empty); // invalid entries

[1] https://www.khronos.org/registry/OpenCL/sdk/2.0/docs/man/xhtml/isequal.html