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[doc] Update clang docs for PTX generation #172588

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[doc] Update clang docs for PTX generation #172588

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7 changes: 4 additions & 3 deletions llvm/docs/CompileCudaWithLLVM.rst
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Expand Up @@ -84,9 +84,10 @@ run your program.
``--cuda-gpu-arch=sm_35``.

Note: You cannot pass ``compute_XX`` as an argument to ``--cuda-gpu-arch``;
only ``sm_XX`` is currently supported. However, clang always includes PTX in
its binaries, so e.g. a binary compiled with ``--cuda-gpu-arch=sm_30`` would be
forwards-compatible with e.g. ``sm_35`` GPUs.
only ``sm_XX`` is currently supported. Note that clang does not include PTX
in its binaries by default. Use ``--cuda-include-ptx=all`` to make clang
include PTX in its binaries. With this flag, a binary compiled with
``--cuda-gpu-arch=sm_30`` would be forwards-compatible with e.g. ``sm_35``.

You can pass ``--cuda-gpu-arch`` multiple times to compile for multiple archs.

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