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Re:HIP – Convert CUDA to Portable C++ by dragandj on Sunday March 18, 2018 @06:53PM (#16614979)
There is no OpenCL in the story there. AMD created HIP as a direct copy of CUDA. It then gets compiled to work on AMD hardware, or can be translated to CUDA.

AMD also supports OpenCL (which I prefer to both CUDA and HIP), but it's not connected to HIP.

Re:HIP – Convert CUDA to Portable C++ by TomV1971 on Sunday March 18, 2018 @07:27PM (#16615134)
Last time I checked, HIP didn’t support reading from textures.

That’s something that’s not only useful for pure graphics.

So it is (or was?) not a straight substitute for CUDA.