Link target library late, to avoid bloat during primary optimization #279
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The NVPTX back-end user guide instructs to optimize after linking libdevice: https://llvm.org/docs/NVPTXUsage.html#linking-with-libdevice |
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Motivated by a conversation with @pmccormick, @neboat, and @stelleg.
Based of the benchmark code https://gist.github.com/vchuravy/7d639aedd98c51d32541ae999504685a, it's not yet behavioral identical to the C++ code in https://github.com/pmccormick/kitsune/blob/ea8ab2916f043a8b33bc20c1c1ec4f280a8f6c1d/kitsune/experiments/raytracer/raytrace-kokkos.cpp but currently performance seems to be not matching NVCC Pat also wrote a CUDA version in https://github.com/pmccormick/kitsune/blob/dev/12.x/kitsune/experiments/raytracer/raytrace-cuda.cu as a baseline