It's GPL so it can be embedded into GPL software.

You SHOULD NOT set VLIW4 on 5xxx. The reason not using VLIW4 is slower is most likely because you don't take into account that 3 hash operations are calculated instead of 2 (you can consider that as if it was using uint3s instead of uint2s). I am not using uint3 because the OpenCL compiler is buggy and generates wrong ISA code, so that I interlace one uint2 and one uint hash operation.

Another thing is: do not pass OLD_ATI to the kernel unless you have a 4xxx GPU. Otherwise you'd have no BITALIGN and BFI_INT.