Missing warp reduce functions in HIP

[Epliz]

Hi,

Warp reduce functions are available in CUDA (cf. https://docs.nvidia.com/cuda/cuda-c-programming-guide/index.html#warp-reduce-functions) but not in HIP.

There is equivalent functionality in HLSL shader model 6.0 supported by all AMD GPUs after the Vega architecture as far as I know: https://github.com/microsoft/DirectXShaderCompiler/wiki/Wave-Intrinsics .

So I think it can be implemented for HIP as well.

Could you please add them?

Best regards,
Epliz

[Epliz]

@cjatin , you were kind enough to have a look at #2 ; this one is quite similar, so I would appreciate if you could have a look at this one as well :) .

[cjatin]

Hello,
Will raise an internal issue to track this and #9