I am trying to move away from OpenCL and CUDA into ArrayFire. One of my functions uses the GPU's popcount() to make pre-processing data easier. But I can't find it anywhere in the list of functions in ArrayFire.

OpenCL has popcount, CUDA has popc, and there is the builtin_popcount for CPU work. Where the heck is the function in ArrayFire? I see count() and count_all() but those are for the element count of the array not the bits in an element (as far as I can tell).

Am I missing something or is this just a feature not implemented in the library? I feel like it is a pretty important function and expected it to be with the bitwise manipulation functions.

I was expecting some function with the ability to tell me the count of 1s in an integer. I honestly would like to leverage the optimization features of the library, but without this it is impossible.

Yes, I can write my own. No I don't want to do it. I want to use the architecture optimized implementations provided by the hardware vendor on the CPUs/GPUs.

I am trying to move away from OpenCL and CUDA into ArrayFire. One of my functions uses the GPU's popcount() to make pre-processing data easier. But I can't find it anywhere in the list of functions in ArrayFire.

OpenCL has popcount, CUDA has popc, and there is the builtin_popcount for CPU work. Where the heck is the function in ArrayFire? I see count() and count_all() but those are for the element count of the array not the bits in an element (as far as I can tell).

Am I missing something or is this just a feature not implemented in the library? I feel like it is a pretty important function and expected it to be with the bitwise manipulation functions.

I was expecting some function with the ability to tell me the count of 1s in an integer. I honestly would like to leverage the optimization features of the library, but without this it is impossible.

Yes, I can write my own. No I don't want to do it. I want to use the architecture optimized implementations provided by the hardware vendor on the CPUs/GPUs.

• c++
• gpu
• bit-manipulation
• arrayfire
• bitcount

Share Improve this question Follow asked Nov 21, 2024 at 3:50 Ben HBen H 3933 bronze badges

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Sorted by: Reset to default 1

Well I will answer my own question.

There is not one.

I looked through the repo, yes they use popc and popcount (CUDA and OpenCl) for the nearest_neighbour. But it is not used anywhere else. So it is not implemented.

Now I have a few choices; use the custom kernel, fork their code and make my own, or abandon this folly and move on.

I will probably try the custom kernel. If it fails I will switch back to OpenCL and CUDA.