half2.h

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#ifndef MSHADOW_HALF2_H_
#define MSHADOW_HALF2_H_

#if (defined(__CUDACC__) && __CUDA_ARCH__ >= 530 && MSHADOW_USE_CUDA && CUDA_VERSION >= 7050)
  #define MSHADOW_CUDA_HALF2 1
  #include <cuda_fp16.h>
#else
  #define MSHADOW_CUDA_HALF2 0
#endif

#include<math.h>

namespace mshadow {
/* \brief name space for host/device portable half-precision floats */
namespace half {

#define MSHADOW_HALF2_ASSIGNOP(AOP, OP)                                   \
  template<typename T>                                                    \
  MSHADOW_XINLINE half2_t operator AOP (const T& a) {                     \
    return *this = half2_t(*this OP a);  /* NOLINT(*)*/                   \
  }                                                                       \

class MSHADOW_ALIGNED(4) half2_t {
 public:
#if MSHADOW_CUDA_HALF2
  half2 half2_;
#else
  half_t half_t2[2];
#endif

  MSHADOW_XINLINE half2_t() {}

#if MSHADOW_CUDA_HALF2
  MSHADOW_XINLINE explicit half2_t(half2 a) : half2_(a) {}
#else
  MSHADOW_XINLINE explicit half2_t(half_t a, half_t b) {
    half_t2[0] = a;
    half_t2[1] = b;
  }
#endif

  MSHADOW_XINLINE explicit half2_t(int a) {
#if MSHADOW_CUDA_HALF2
    half2_ = __half2half2(__int2half_rz(a));
#else
    half_t2[0] = (half_t)a;
    half_t2[1] = (half_t)a;
#endif
  }

  MSHADOW_XINLINE half2_t operator+() {
    return *this;
  }

  MSHADOW_XINLINE half2_t operator-() {
#if MSHADOW_CUDA_HALF2
    return half2_t(__hneg2(half2_));
#else
    return half2_t(-half_t2[0], -half_t2[1]);
#endif
  }

  MSHADOW_XINLINE half2_t operator=(const half2_t& a) {
#if MSHADOW_CUDA_HALF2
    half2_ = a.half2_;
#else
    half_t2[0] = a.half_t2[0];
    half_t2[1] = a.half_t2[1];
#endif
    return a;
  }

  MSHADOW_HALF2_ASSIGNOP(+=, +)
  MSHADOW_HALF2_ASSIGNOP(-=, -)
  MSHADOW_HALF2_ASSIGNOP(*=, *)
  MSHADOW_HALF2_ASSIGNOP(/=, /)
};

MSHADOW_XINLINE half2_t operator+(half2_t a, half2_t b) {
#if MSHADOW_CUDA_HALF2
  return half2_t(__floats2half2_rn(__low2float(a.half2_) + __low2float(b.half2_),
                                   __high2float(a.half2_) + __high2float(b.half2_)));
#else
  return half2_t(a.half_t2[0] + b.half_t2[0], a.half_t2[1] + b.half_t2[1]);
#endif
}
MSHADOW_XINLINE half2_t operator-(half2_t a, half2_t b) {
#if MSHADOW_CUDA_HALF2
  return half2_t(__floats2half2_rn(__low2float(a.half2_) - __low2float(b.half2_),
                                   __high2float(a.half2_) - __high2float(b.half2_)));
#else
  return half2_t(a.half_t2[0] - b.half_t2[0], a.half_t2[1] - b.half_t2[1]);
#endif
}
MSHADOW_XINLINE half2_t operator*(half2_t a, half2_t b) {
#if MSHADOW_CUDA_HALF2
  return half2_t(__floats2half2_rn(__low2float(a.half2_) * __low2float(b.half2_),
                                   __high2float(a.half2_) * __high2float(b.half2_)));
#else
  return half2_t(a.half_t2[0] * b.half_t2[0], a.half_t2[1] * b.half_t2[1]);
#endif
}
MSHADOW_XINLINE half2_t operator/(half2_t a, half2_t b) {
#if MSHADOW_CUDA_HALF2
  return half2_t(__floats2half2_rn(__low2float(a.half2_) / __low2float(b.half2_),
                                   __high2float(a.half2_) / __high2float(b.half2_)));
#else
  return half2_t(a.half_t2[0] / b.half_t2[0], a.half_t2[1] / b.half_t2[1]);
#endif
}
MSHADOW_XINLINE half2_t operator%(half2_t a, half2_t b) {
#if MSHADOW_CUDA_HALF2
  return half2_t(__floats2half2_rn(::fmod(__low2float(a.half2_), __low2float(b.half2_)),
                                   ::fmod(__high2float(a.half2_), __high2float(b.half2_))));
#else
  return half2_t(::fmod(a.half_t2[0], b.half_t2[0]), ::fmod(a.half_t2[1], b.half_t2[1]));
#endif
}
MSHADOW_XINLINE bool operator==(half2_t a, half2_t b) {
#if MSHADOW_CUDA_HALF2
  return __hbeq2(a.half2_, b.half2_);
#else
  return (a.half_t2[0] == b.half_t2[0] && a.half_t2[1] == b.half_t2[1]);
#endif
}

}  // namespace half
}  // namespace mshadow
#endif  // MSHADOW_HALF2_H_