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Fix #2077, EIGEN_CONSTEXPR in Half.

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`bit_cast` cannot be `constexpr`, so we need to remove `EIGEN_CONSTEXPR` from
`raw_half_as_uint16(...)`.  This shouldn't affect anything else, since
it is only used in `a bit_cast<uint16_t,half>()` which is not itself
`constexpr`.

Fixes #2077.
This commit is contained in:
Antonio Sanchez 2020-11-30 13:45:46 -08:00 committed by Rasmus Munk Larsen
parent 7b80609d49
commit 1992af3de2
1 changed files with 1 additions and 1 deletions
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Eigen/src/Core/arch/Default/Half.h
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@ -455,7 +455,7 @@ EIGEN_STRONG_INLINE EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR __half_raw raw_uint16_to_h
#endif
}
EIGEN_STRONG_INLINE EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR numext::uint16_t raw_half_as_uint16(const __half_raw& h) {
EIGEN_STRONG_INLINE EIGEN_DEVICE_FUNC numext::uint16_t raw_half_as_uint16(const __half_raw& h) {
// HIP/CUDA/Default have a member 'x' of type uint16_t.
// For ARM64 native half, the member 'x' is of type __fp16, so we need to bit-cast.
// For SYCL, cl::sycl::half is _Float16, so cast directly.