m128i.hpp

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//============================================================================
// vSMC/include/vsmc/rng/m128i.hpp
//----------------------------------------------------------------------------
//                         vSMC: Scalable Monte Carlo
//----------------------------------------------------------------------------
// Copyright (c) 2013,2014, Yan Zhou
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//   Redistributions of source code must retain the above copyright notice,
//   this list of conditions and the following disclaimer.
//
//   Redistributions in binary form must reproduce the above copyright notice,
//   this list of conditions and the following disclaimer in the documentation
//   and/or other materials provided with the distribution.
//
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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//============================================================================

#ifndef VSMC_RNG_M128I_HPP
#define VSMC_RNG_M128I_HPP

#include <vsmc/rng/internal/common.hpp>
#include <emmintrin.h>

#define VSMC_STATIC_ASSERT_RNG_M128I_PACK(Offset, T, N) \
    VSMC_STATIC_ASSERT(                                                      \
            ((Offset < N) && (sizeof(T) * (N - Offset) >= sizeof(__m128i))), \
            TRY_TO_PACK_OR_UNPACK_A_TOO_SMALL_VECTOR_INTO_OR_FROM_m128i)

namespace vsmc {

template <std::size_t Offset, typename T, std::size_t N>
inline void m128i_pack_a (const Array<T, N> &c, __m128i &m)
{m = _mm_load_si128(reinterpret_cast<const __m128i *>(c.data() + Offset));}

template <std::size_t Offset, typename T, std::size_t N>
inline void m128i_pack_u (const Array<T, N> &c, __m128i &m)
{m = _mm_loadu_si128(reinterpret_cast<const __m128i *>(c.data() + Offset));}

template <std::size_t Offset, typename T, std::size_t N>
inline void m128i_unpack_a (const __m128i &m, Array<T, N> &c)
{_mm_store_si128(reinterpret_cast<__m128i *>(c.data() + Offset), m);}

template <std::size_t Offset, typename T, std::size_t N>
inline void m128i_unpack_u (const __m128i &m, Array<T, N> &c)
{_mm_storeu_si128(reinterpret_cast<__m128i *>(c.data() + Offset), m);}

template <std::size_t Offset, typename T, std::size_t N>
inline void m128i_pack (const Array<T, N> &c, __m128i &m)
{
    VSMC_STATIC_ASSERT_RNG_M128I_PACK(Offset, T, N);
    m128i_pack_u<Offset>(c, m);
}

template <std::size_t Offset, typename T, std::size_t N>
inline void m128i_unpack (const __m128i &m, Array<T, N> &c)
{
    VSMC_STATIC_ASSERT_RNG_M128I_PACK(Offset, T, N);
    m128i_unpack_u<Offset>(m, c);
}

inline bool m128i_is_equal (const __m128i &a, const __m128i &b)
{
    Array<uint64_t, 2> sa;
    Array<uint64_t, 2> sb;
    m128i_unpack<0>(a, sa);
    m128i_unpack<0>(b, sb);

    return sa == sb;
}

template <typename CharT, typename Traits>
inline std::basic_ostream<CharT, Traits> &m128i_output (
        std::basic_ostream<CharT, Traits> &os, const __m128i &a)
{
    if (os.good()) {
        Array<unsigned char, 16> sa;
        m128i_unpack<0>(a, sa);
        os << sa;
    }

    return os;
}

template <typename CharT, typename Traits>
inline std::basic_istream<CharT, Traits> &m128i_input (
        std::basic_istream<CharT, Traits> &is, __m128i &a)
{
    if (is.good()) {
        Array<unsigned char, 16> sa;
        is >> sa;
        if (is) m128i_pack<0>(sa, a);
    }

    return is;
}

} // namespace vsmc

#endif // VSMC_RNG_M128I_HPP