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Implement bit_* for device.

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Unfortunately `std::bit_and` and the like are host-only functions prior
to c++14 (since they are not `constexpr`).  They also never exist in the
global namespace, so the current implementation  always fails to compile via
NVCC - since `EIGEN_USING_STD` tries to import the symbol from the global
namespace on device.

To overcome these limitations, we implement these functionals here.
This commit is contained in:
Antonio Sanchez 2021-02-01 13:23:53 -08:00
parent 1615a27993
commit fb4548e27b
1 changed files with 22 additions and 16 deletions
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38
Eigen/src/Core/GenericPacketMath.h
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@ -266,37 +266,43 @@ EIGEN_DEVICE_FUNC inline Packet bitwise_helper(const Packet& a, const Packet& b,
return c;
}
template<typename T>
struct bit_and {
EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR EIGEN_ALWAYS_INLINE T operator()(const T& a, const T& b) const {
return a & b;
}
};
template<typename T>
struct bit_or {
EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR EIGEN_ALWAYS_INLINE T operator()(const T& a, const T& b) const {
return a | b;
}
};
template<typename T>
struct bit_xor {
EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR EIGEN_ALWAYS_INLINE T operator()(const T& a, const T& b) const {
return a ^ b;
}
};
/** \internal \returns the bitwise and of \a a and \a b */
template<typename Packet> EIGEN_DEVICE_FUNC inline Packet
pand(const Packet& a, const Packet& b) {
#if defined(EIGEN_HIP_DEVICE_COMPILE)
return bitwise_helper(a ,b, std::bit_and<unsigned char>());
#else
EIGEN_USING_STD(bit_and);
return bitwise_helper(a ,b, bit_and<unsigned char>());
#endif
return bitwise_helper(a, b, bit_and<unsigned char>());
}
/** \internal \returns the bitwise or of \a a and \a b */
template<typename Packet> EIGEN_DEVICE_FUNC inline Packet
por(const Packet& a, const Packet& b) {
#if defined(EIGEN_HIP_DEVICE_COMPILE)
return bitwise_helper(a ,b, std::bit_or<unsigned char>());
#else
EIGEN_USING_STD(bit_or);
return bitwise_helper(a ,b, bit_or<unsigned char>());
#endif
}
/** \internal \returns the bitwise xor of \a a and \a b */
template<typename Packet> EIGEN_DEVICE_FUNC inline Packet
pxor(const Packet& a, const Packet& b) {
#if defined(EIGEN_HIP_DEVICE_COMPILE)
return bitwise_helper(a ,b, std::bit_xor<unsigned char>());
#else
EIGEN_USING_STD(bit_xor);
return bitwise_helper(a ,b, bit_xor<unsigned char>());
#endif
}
/** \internal \returns the bitwise and of \a a and not \a b */