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   2   Copyright 1988-2022 Free Software Foundation, Inc.
   3   This is part of the GCC manual.
   4   For copying conditions, see the copyright.rst file.
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   6 .. _nvidia-ptx-function-attributes:
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   8 Nvidia PTX Function Attributes
   9 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  10
  11 These function attributes are supported by the Nvidia PTX back end:
  12
  13 .. index:: kernel attribute, Nvidia PTX
  14
  15 .. nvidia-ptx-fn-attr:: kernel
  16
  17   This attribute indicates that the corresponding function should be compiled
  18   as a kernel function, which can be invoked from the host via the CUDA RT
  19   library.
  20   By default functions are only callable only from other PTX functions.
  21
  22   Kernel functions must have ``void`` return type.