[PATCH] D154790: [HIP] Use native math functions for `-fcuda-approx-transcendentals`

[Yaxun Liu via Phabricator via cfe-commits]

yaxunl created this revision.
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CUDA allows replacing standard math functions with less accurate
native math functions when `-use_fast_math` is specified
(https://docs.nvidia.com/cuda/cuda-c-programming-guide/index.html#intrinsic-functions).
Cuda-clang does this when `-fcuda-approx-transcendentals`
or `-ffast-math` is specified. HIP-clang currently passes option
`-fcuda-approx-transcendentals` to clang `-cc1` and predefines
`__CLANG_CUDA_APPROX_TRANSCENDENTALS__` but does
not replace standard math functions with native math functions.

This patch implements this in a similar approach as cuda-clang.


https://reviews.llvm.org/D154790

Files:
  clang/lib/Headers/__clang_hip_math.h
  clang/test/Headers/__clang_hip_math.hip

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