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#ifndef VECCORE_BACKEND_STD_SIMD_H
#define VECCORE_BACKEND_STD_SIMD_H
#if __cplusplus >= 202002L && defined(__has_include)
#if __has_include(<experimental/simd>)
#define VECCORE_ENABLE_STD_SIMD
#endif
#endif
#ifdef VECCORE_ENABLE_STD_SIMD
#include <experimental/simd>
namespace vecCore {
template <typename T, class Abi>
struct TypeTraits<std::experimental::simd_mask<T, Abi>> {
using IndexType = typename std::experimental::simd_mask<T, Abi>::simd_type;
using ScalarType = typename std::experimental::simd_mask<T, Abi>::value_type;
static constexpr size_t Size = std::experimental::simd<T, Abi>::size();
};
template <typename T, class Abi>
struct TypeTraits<std::experimental::simd<T, Abi>> {
using MaskType = typename std::experimental::simd<T, Abi>::mask_type;
using IndexType = typename std::experimental::simd<T, Abi>;
using ScalarType = typename std::experimental::simd<T, Abi>::value_type;
static constexpr size_t Size = std::experimental::simd<T, Abi>::size();
};
namespace backend {
template <class Abi> class SIMD {
public:
using Real_v = std::experimental::simd<Real_s, Abi>;
using Float_v = std::experimental::simd<float, Abi>;
using Double_v = std::experimental::simd<double, Abi>;
using Int_v = std::experimental::simd<int, Abi>;
using Int16_v = std::experimental::simd<int16_t, Abi>;
using Int32_v = std::experimental::simd<int32_t, Abi>;
using Int64_v = std::experimental::simd<int64_t, Abi>;
using UInt_v = std::experimental::simd<unsigned int, Abi>;
using UInt16_v = std::experimental::simd<uint16_t, Abi>;
using UInt32_v = std::experimental::simd<uint32_t, Abi>;
using UInt64_v = std::experimental::simd<uint64_t, Abi>;
};
class SIMDNative {
public:
using Real_v = std::experimental::native_simd<Real_s>;
using Float_v = std::experimental::native_simd<float>;
using Double_v = std::experimental::native_simd<double>;
using Int_v = std::experimental::native_simd<int>;
using Int16_v = std::experimental::native_simd<int16_t>;
using Int32_v = std::experimental::native_simd<int32_t>;
using Int64_v = std::experimental::native_simd<int64_t>;
using UInt_v = std::experimental::native_simd<unsigned int>;
using UInt16_v = std::experimental::native_simd<uint16_t>;
using UInt32_v = std::experimental::native_simd<uint32_t>;
using UInt64_v = std::experimental::native_simd<uint64_t>;
};
using SIMDScalar = SIMD<std::experimental::simd_abi::scalar>;
template <size_t N>
using SIMDVector = SIMD<std::experimental::simd_abi::fixed_size<N>>;
} // namespace backend
template <typename T, class Abi>
bool MaskEmpty(std::experimental::simd_mask<T, Abi> mask) {
for (int i = 0; i < mask.size(); ++i)
if (mask[i])
return false;
return true;
}
template <typename T, class Abi>
bool MaskFull(std::experimental::simd_mask<T, Abi> mask) {
for (int i = 0; i < mask.size(); ++i)
if (!mask[i])
return false;
return true;
}
template <typename T, class Abi>
struct IndexingImplementation<std::experimental::simd<T, Abi>> {
using V = std::experimental::simd<T, Abi>;
static inline T Get(const V &v, size_t i) { return v[i]; }
static inline void Set(V &v, size_t i, T const val) { v[i] = val; }
};
template <typename T, class Abi>
struct IndexingImplementation<std::experimental::simd_mask<T, Abi>> {
using V = std::experimental::simd_mask<T, Abi>;
static inline T Get(const V &v, size_t i) { return v[i]; }
static inline void Set(V &v, size_t i, T const val) { v[i] = !!val; }
};
template <typename T, class Abi>
struct LoadStoreImplementation<std::experimental::simd<T, Abi>> {
using V = std::experimental::simd<T, Abi>;
template <typename S = T> static inline void Load(V &v, S const *ptr) {
for (size_t i = 0; i < V::size(); ++i)
v[i] = ptr[i];
}
template <typename S = T> static inline void Store(V const &v, S *ptr) {
for (size_t i = 0; i < V::size(); ++i)
ptr[i] = static_cast<S>(v[i]);
}
};
template <typename T, class Abi>
struct LoadStoreImplementation<std::experimental::simd_mask<T, Abi>> {
using V = typename std::experimental::simd_mask<T, Abi>;
template <typename S = T> static inline void Load(V &v, S const *ptr) {
for (size_t i = 0; i < V::size(); ++i)
v[i] = !!ptr[i];
}
template <typename S = T> static inline void Store(V const &v, S *ptr) {
for (size_t i = 0; i < V::size(); ++i)
ptr[i] = static_cast<S>(v[i]);
}
};
template <typename T, class Abi>
struct MaskingImplementation<std::experimental::simd<T, Abi>> {
using V = typename std::experimental::simd<T, Abi>;
using M = typename std::experimental::simd<T, Abi>::mask_type;
static inline void Assign(V &dst, M const &mask, V const &src) {
where(mask, dst) = src;
}
static inline void Blend(V &dst, M const &mask, V const &src1,
V const &src2) {
where(mask, dst) = src1;
where(!mask, dst) = src2;
}
};
template <class Abi>
struct GatherScatterImplementation<std::experimental::simd<float, Abi>> {
using V = typename std::experimental::simd<float, Abi>;
template <typename S = float>
static inline void Gather(V &v, S const *ptr, V const &idx) {
auto ii = std::experimental::static_simd_cast<int, float, Abi>(idx);
for (size_t i = 0; i < V::size(); ++i)
v[i] = ptr[ii[i]];
}
template <typename S = float>
static inline void Scatter(V const &v, S *ptr, V const &idx) {
auto ii = std::experimental::static_simd_cast<int, float, Abi>(idx);
for (size_t i = 0; i < V::size(); ++i)
ptr[ii[i]] = v[i];
}
};
template <class Abi>
struct GatherScatterImplementation<std::experimental::simd<double, Abi>> {
using V = typename std::experimental::simd<double, Abi>;
template <typename S = double>
static inline void Gather(V &v, S const *ptr, V const &idx) {
auto ii = std::experimental::static_simd_cast<int64_t, double, Abi>(idx);
for (size_t i = 0; i < V::size(); ++i)
v[i] = ptr[ii[i]];
}
template <typename S = double>
static inline void Scatter(V const &v, S *ptr, V const &idx) {
auto ii = std::experimental::static_simd_cast<int64_t, double, Abi>(idx);
for (size_t i = 0; i < V::size(); ++i)
ptr[ii[i]] = v[i];
}
};
} // namespace vecCore
#endif
#endif
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