// -*-C++-*-

#ifndef VEC_SSE_FLOAT1_H
#define VEC_SSE_FLOAT1_H

#include "floatprops.h"
#include "mathfuncs.h"
#include "vec_base.h"

#include <cmath>
#include <climits>

// SSE2 intrinsics
#include <emmintrin.h>
#ifdef __SSE3__ // Intel's SSE 3
#include <pmmintrin.h>
#endif
#ifdef __SSE4_1__ // Intel's SSE 4.1
#include <smmintrin.h>
#endif
#ifdef __SSE4A__ // AMD's SSE 4a
#include <ammintrin.h>
#endif
#if defined __AVX__ // Intel's AVX
#include <immintrin.h>
#endif

namespace vecmathlib {

#define VECMATHLIB_HAVE_VEC_FLOAT_1
template <> struct boolvec<float, 1>;
template <> struct intvec<float, 1>;
template <> struct realvec<float, 1>;

template <> struct boolvec<float, 1> : floatprops<float> {
  static int const size = 1;
  typedef bool scalar_t;
  typedef uint_t bvector_t;
  static int const alignment = sizeof(bvector_t);

  static_assert(size * sizeof(real_t) == sizeof(bvector_t),
                "vector size is wrong");

  // true values are non-zero, false values are zero

  typedef boolvec boolvec_t;
  typedef intvec<real_t, size> intvec_t;
  typedef realvec<real_t, size> realvec_t;

  // Short names for type casts
  typedef real_t R;
  typedef int_t I;
  typedef uint_t U;
  typedef realvec_t RV;
  typedef intvec_t IV;
  typedef boolvec_t BV;
  typedef floatprops<real_t> FP;
  typedef mathfuncs<realvec_t> MF;

  bvector_t v;

  boolvec() {}
  // Can't have a non-trivial copy constructor; if so, objects won't
  // be passed in registers
  // boolvec(boolvec const& x): v(x.v) {}
  // boolvec& operator=(boolvec const& x) { return v=x.v, *this; }
  boolvec(bvector_t x) : v(x) {}
  boolvec(bool a) : v(a) {}
  boolvec(bool const *as) : v(as[0]) {}

  operator bvector_t() const { return v; }
  bool operator[](int n) const { return v; }
  boolvec_t &set_elt(int n, bool a) { return v = a, *this; }

  intvec_t as_int() const;      // defined after intvec
  intvec_t convert_int() const; // defined after intvec

  boolvec_t operator!() const { return !v; }

  boolvec_t operator&&(boolvec_t x) const { return v && x.v; }
  boolvec_t operator||(boolvec_t x) const { return v || x.v; }
  boolvec_t operator==(boolvec_t x) const { return bool(v) == bool(x.v); }
  boolvec_t operator!=(boolvec_t x) const { return bool(v) != bool(x.v); }

  bool all() const { return *this; }
  bool any() const { return *this; }

  // ifthen(condition, then-value, else-value)
  boolvec_t ifthen(boolvec_t x, boolvec_t y) const;
  intvec_t ifthen(intvec_t x, intvec_t y) const;    // defined after intvec
  realvec_t ifthen(realvec_t x, realvec_t y) const; // defined after realvec
};

template <> struct intvec<float, 1> : floatprops<float> {
  static int const size = 1;
  typedef int_t scalar_t;
  typedef int_t ivector_t;
  static int const alignment = sizeof(ivector_t);

  static_assert(size * sizeof(real_t) == sizeof(ivector_t),
                "vector size is wrong");

  typedef boolvec<real_t, size> boolvec_t;
  typedef intvec intvec_t;
  typedef realvec<real_t, size> realvec_t;

  // Short names for type casts
  typedef real_t R;
  typedef int_t I;
  typedef uint_t U;
  typedef realvec_t RV;
  typedef intvec_t IV;
  typedef boolvec_t BV;
  typedef floatprops<real_t> FP;
  typedef mathfuncs<realvec_t> MF;

  ivector_t v;

  intvec() {}
  // Can't have a non-trivial copy constructor; if so, objects won't
  // be passed in registers
  // intvec(intvec const& x): v(x.v) {}
  // intvec& operator=(intvec const& x) { return v=x.v, *this; }
  intvec(int_t a) : v(a) {}
  intvec(int_t const *as) : v(as[0]) {}
  static intvec_t iota() { return intvec(I(0)); }

  operator ivector_t() const { return v; }
  int_t operator[](int n) const { return v; }
  intvec_t &set_elt(int n, int_t a) { return v = a, *this; }

  boolvec_t as_bool() const { return U(v); }
  boolvec_t convert_bool() const { return bool(v); }
  realvec_t as_float() const;      // defined after realvec
  realvec_t convert_float() const; // defined after realvec

  intvec_t operator+() const { return +v; }
  intvec_t operator-() const { return -v; }

  intvec_t operator+(intvec_t x) const { return v + x.v; }
  intvec_t operator-(intvec_t x) const { return v - x.v; }
  intvec_t operator*(intvec_t x) const { return v * x.v; }
  intvec_t operator/(intvec_t x) const { return v / x.v; }
  intvec_t operator%(intvec_t x) const { return v % x.v; }

  intvec_t &operator+=(intvec_t const &x) { return *this = *this + x; }
  intvec_t &operator-=(intvec_t const &x) { return *this = *this - x; }
  intvec_t &operator*=(intvec_t const &x) { return *this = *this * x; }
  intvec_t &operator/=(intvec_t const &x) { return *this = *this / x; }
  intvec_t &operator%=(intvec_t const &x) { return *this = *this % x; }

  intvec_t operator~() const { return ~v; }

  intvec_t operator&(intvec_t x) const { return v & x.v; }
  intvec_t operator|(intvec_t x) const { return v | x.v; }
  intvec_t operator^(intvec_t x) const { return v ^ x.v; }

  intvec_t &operator&=(intvec_t const &x) { return *this = *this & x; }
  intvec_t &operator|=(intvec_t const &x) { return *this = *this | x; }
  intvec_t &operator^=(intvec_t const &x) { return *this = *this ^ x; }

  intvec_t bitifthen(intvec_t x, intvec_t y) const;

  intvec_t lsr(int_t n) const { return U(v) >> U(n); }
  intvec_t rotate(int_t n) const;
  intvec_t operator>>(int_t n) const { return v >> n; }
  intvec_t operator<<(int_t n) const { return v << n; }

  intvec_t &operator>>=(int_t n) { return *this = *this >> n; }
  intvec_t &operator<<=(int_t n) { return *this = *this << n; }

  intvec_t lsr(intvec_t n) const { return U(v) >> U(n); }
  intvec_t rotate(intvec_t n) const;
  intvec_t operator>>(intvec_t n) const { return v >> n; }
  intvec_t operator<<(intvec_t n) const { return v << n; }

  intvec_t &operator>>=(intvec_t n) { return *this = *this >> n; }
  intvec_t &operator<<=(intvec_t n) { return *this = *this << n; }

  intvec_t clz() const { return __builtin_clz(v); }
  intvec_t popcount() const { return __builtin_popcount(v); }

  boolvec_t operator==(intvec_t const &x) const { return v == x.v; }
  boolvec_t operator!=(intvec_t const &x) const { return v != x.v; }
  boolvec_t operator<(intvec_t const &x) const { return v < x.v; }
  boolvec_t operator<=(intvec_t const &x) const { return v <= x.v; }
  boolvec_t operator>(intvec_t const &x) const { return v > x.v; }
  boolvec_t operator>=(intvec_t const &x) const { return v >= x.v; }

  intvec_t abs() const { return std::abs(v); }
  boolvec_t isignbit() const { return v < 0; }
  intvec_t max(intvec_t x) const { return std::max(v, x.v); }
  intvec_t min(intvec_t x) const { return std::min(v, x.v); }
};

template <> struct realvec<float, 1> : floatprops<float> {
  static int const size = 1;
  typedef real_t scalar_t;
  typedef float vector_t;
  static int const alignment = sizeof(vector_t);

  static char const *name() { return "<SSE2:1*float>"; }
  void barrier() { __asm__("" : "+x"(v)); }

  static_assert(size * sizeof(real_t) == sizeof(vector_t),
                "vector size is wrong");

private:
  static __m128 from_float(float a) { return _mm_set_ss(a); }
  static float to_float(__m128 a) { return _mm_cvtss_f32(a); }

public:
  typedef boolvec<real_t, size> boolvec_t;
  typedef intvec<real_t, size> intvec_t;
  typedef realvec realvec_t;

  // Short names for type casts
  typedef real_t R;
  typedef int_t I;
  typedef uint_t U;
  typedef realvec_t RV;
  typedef intvec_t IV;
  typedef boolvec_t BV;
  typedef floatprops<real_t> FP;
  typedef mathfuncs<realvec_t> MF;

  vector_t v;

  realvec() {}
  // Can't have a non-trivial copy constructor; if so, objects won't
  // be passed in registers
  // realvec(realvec const& x): v(x.v) {}
  // realvec& operator=(realvec const& x) { return v=x.v, *this; }
  realvec(real_t a) : v(a) {}
  realvec(real_t const *as) : v(as[0]) {}

  operator vector_t() const { return v; }
  real_t operator[](int n) const { return v; }
  realvec_t &set_elt(int n, real_t a) { return v = a, *this; }

  typedef vecmathlib::mask_t<realvec_t> mask_t;

  static realvec_t loada(real_t const *p) {
    VML_ASSERT(intptr_t(p) % alignment == 0);
    return *p;
  }
  static realvec_t loadu(real_t const *p) { return *p; }
  static realvec_t loadu(real_t const *p, std::ptrdiff_t ioff) {
    VML_ASSERT(intptr_t(p) % alignment == 0);
    return loada(p + ioff);
  }
  realvec_t loada(real_t const *p, mask_t const &m) const {
    VML_ASSERT(intptr_t(p) % alignment == 0);
    if (__builtin_expect(all(m.m), true)) {
      return loada(p);
    } else {
      return *this;
    }
  }
  realvec_t loadu(real_t const *p, mask_t const &m) const {
    if (__builtin_expect(m.all_m, true)) {
      return loadu(p);
    } else {
      return *this;
    }
  }
  realvec_t loadu(real_t const *p, std::ptrdiff_t ioff, mask_t const &m) const {
    VML_ASSERT(intptr_t(p) % alignment == 0);
    return loada(p + ioff, m);
  }

  void storea(real_t *p) const {
    VML_ASSERT(intptr_t(p) % alignment == 0);
    *p = v;
  }
  void storeu(real_t *p) const { *p = v; }
  void storeu(real_t *p, std::ptrdiff_t ioff) const {
    VML_ASSERT(intptr_t(p) % alignment == 0);
    storea(p + ioff);
  }
  void storea(real_t *p, mask_t const &m) const {
    VML_ASSERT(intptr_t(p) % alignment == 0);
    if (__builtin_expect(m.all_m, true)) {
      storea(p);
    }
  }
  void storeu(real_t *p, mask_t const &m) const {
    if (__builtin_expect(m.all_m, true)) {
      storeu(p);
    }
  }
  void storeu(real_t *p, std::ptrdiff_t ioff, mask_t const &m) const {
    VML_ASSERT(intptr_t(p) % alignment == 0);
    storea(p + ioff, m);
  }

  intvec_t as_int() const { return floatprops::as_int(v); }
  intvec_t convert_int() const {
    // return floatprops::convert_int(v);
    return _mm_cvttss_si32(_mm_set_ss(v));
  }

  realvec_t operator+() const { return +v; }
  realvec_t operator-() const { return -v; }

  realvec_t operator+(realvec_t x) const { return v + x.v; }
  realvec_t operator-(realvec_t x) const { return v - x.v; }
  realvec_t operator*(realvec_t x) const { return v * x.v; }
  realvec_t operator/(realvec_t x) const { return v / x.v; }

  realvec_t &operator+=(realvec_t const &x) { return *this = *this + x; }
  realvec_t &operator-=(realvec_t const &x) { return *this = *this - x; }
  realvec_t &operator*=(realvec_t const &x) { return *this = *this * x; }
  realvec_t &operator/=(realvec_t const &x) { return *this = *this / x; }

  real_t maxval() const { return *this; }
  real_t minval() const { return *this; }
  real_t prod() const { return *this; }
  real_t sum() const { return *this; }

  boolvec_t operator==(realvec_t const &x) const { return v == x.v; }
  boolvec_t operator!=(realvec_t const &x) const { return v != x.v; }
  boolvec_t operator<(realvec_t const &x) const { return v < x.v; }
  boolvec_t operator<=(realvec_t const &x) const { return v <= x.v; }
  boolvec_t operator>(realvec_t const &x) const { return v > x.v; }
  boolvec_t operator>=(realvec_t const &x) const { return v >= x.v; }

  realvec_t acos() const { return MF::vml_acos(*this); }
  realvec_t acosh() const { return MF::vml_acosh(*this); }
  realvec_t asin() const { return MF::vml_asin(*this); }
  realvec_t asinh() const { return MF::vml_asinh(*this); }
  realvec_t atan() const { return MF::vml_atan(*this); }
  realvec_t atan2(realvec_t y) const { return MF::vml_atan2(*this, y); }
  realvec_t atanh() const { return MF::vml_atanh(*this); }
  realvec_t cbrt() const { return MF::vml_cbrt(*this); }
  realvec_t ceil() const {
#ifdef __SSE4_1__
    return to_float(_mm_ceil_ss(from_float(v), from_float(v)));
#else
    return vml_std::ceil(v);
#endif
  }
  realvec_t copysign(realvec_t y) const { return vml_std::copysign(v, y.v); }
  realvec_t cos() const { return MF::vml_cos(*this); }
  realvec_t cosh() const { return MF::vml_cosh(*this); }
  realvec_t exp() const { return MF::vml_exp(*this); }
  realvec_t exp10() const { return MF::vml_exp10(*this); }
  realvec_t exp2() const { return MF::vml_exp2(*this); }
  realvec_t expm1() const { return MF::vml_expm1(*this); }
  realvec_t fabs() const { return vml_std::fabs(v); }
  realvec_t fdim(realvec_t y) const { return MF::vml_fdim(*this, y); }
  realvec_t floor() const {
#ifdef __SSE4_1__
    return to_float(_mm_floor_ss(from_float(v), from_float(v)));
#else
    return vml_std::floor(v);
#endif
  }
  realvec_t fma(realvec_t y, realvec_t z) const {
    return MF::vml_fma(*this, y, z);
  }
  realvec_t fmax(realvec_t y) const {
    return to_float(_mm_max_ss(from_float(v), from_float(y.v)));
  }
  realvec_t fmin(realvec_t y) const {
    return to_float(_mm_min_ss(from_float(v), from_float(y.v)));
  }
  realvec_t fmod(realvec_t y) const { return vml_std::fmod(v, y.v); }
  realvec_t frexp(intvec_t *irp) const {
    int iri;
    realvec_t r = vml_std::frexp(v, &iri);
    int_t ir = iri;
    if (isinf())
      ir = std::numeric_limits<int_t>::max();
    if (isnan())
      ir = std::numeric_limits<int_t>::min();
    irp->v = ir;
    return r;
  }
  realvec_t hypot(realvec_t y) const { return MF::vml_hypot(*this, y); }
  intvec_t ilogb() const {
    int_t r = vml_std::ilogb(v);
    typedef std::numeric_limits<int_t> NL;
    if (FP_ILOGB0 != NL::min() and *this == RV(R(0.0))) {
      r = NL::min();
#if defined VML_HAVE_INF
    } else if (INT_MAX != NL::max() and vml_std::isinf(v)) {
      r = NL::max();
#endif
#if defined VML_HAVE_NAN
    } else if (FP_ILOGBNAN != NL::min() and isnan()) {
      r = NL::min();
#endif
    }
    return r;
  }
  boolvec_t isfinite() const { return vml_std::isfinite(v); }
  boolvec_t isinf() const { return vml_std::isinf(v); }
  boolvec_t isnan() const {
#if defined VML_HAVE_NAN
    // This is wrong:
    // return _mm_ucomineq_ss(from_float(v), from_float(v));
    // This works:
    // char r;
    // __asm__("ucomiss %[v],%[v]; setp %[r]": [r]"=q"(r): [v]"x"(v));
    // return boolvec_t::scalar_t(r);
    // This works as well:
    return vml_std::isnan(v);
#else
    return BV(false);
#endif
  }
  boolvec_t isnormal() const { return vml_std::isnormal(v); }
  realvec_t ldexp(int_t n) const { return vml_std::ldexp(v, n); }
  realvec_t ldexp(intvec_t n) const { return vml_std::ldexp(v, n); }
  realvec_t log() const { return MF::vml_log(*this); }
  realvec_t log10() const { return MF::vml_log10(*this); }
  realvec_t log1p() const { return MF::vml_log1p(*this); }
  realvec_t log2() const { return MF::vml_log2(*this); }
  realvec_t mad(realvec_t y, realvec_t z) const {
    return MF::vml_mad(*this, y, z);
  }
  realvec_t nextafter(realvec_t y) const { return MF::vml_nextafter(*this, y); }
  realvec_t pow(realvec_t y) const { return MF::vml_pow(*this, y); }
  realvec_t rcp() const { return R(1.0) / v; }
  realvec_t remainder(realvec_t y) const { return vml_std::remainder(v, y.v); }
  realvec_t rint() const {
#ifdef __SSE4_1__
    return to_float(
        _mm_round_ss(from_float(v), from_float(v), _MM_FROUND_TO_NEAREST_INT));
#else
    return MF::vml_rint(*this);
#endif
  }
  realvec_t round() const { return MF::vml_round(*this); }
  realvec_t rsqrt() const { return MF::vml_rsqrt(*this); }
  boolvec_t signbit() const { return vml_std::signbit(v); }
  realvec_t sin() const { return MF::vml_sin(*this); }
  realvec_t sinh() const { return MF::vml_sinh(*this); }
  realvec_t sqrt() const { return to_float(_mm_sqrt_ss(from_float(v))); }
  realvec_t tan() const { return MF::vml_tan(*this); }
  realvec_t tanh() const { return MF::vml_tanh(*this); }
  realvec_t trunc() const {
#ifdef __SSE4_1__
    return to_float(
        _mm_round_ss(from_float(v), from_float(v), _MM_FROUND_TO_ZERO));
#else
    return MF::vml_trunc(*this);
#endif
  }
};

// boolvec definitions

inline intvec<float, 1> boolvec<float, 1>::as_int() const { return I(v); }

inline intvec<float, 1> boolvec<float, 1>::convert_int() const { return v; }

inline boolvec<float, 1> boolvec<float, 1>::ifthen(boolvec_t x,
                                                   boolvec_t y) const {
  return v ? x : y;
}

inline intvec<float, 1> boolvec<float, 1>::ifthen(intvec_t x,
                                                  intvec_t y) const {
  return v ? x : y;
}

inline realvec<float, 1> boolvec<float, 1>::ifthen(realvec_t x,
                                                   realvec_t y) const {
  return v ? x : y;
}

// intvec definitions

inline realvec<float, 1> intvec<float, 1>::as_float() const {
  return FP::as_float(v);
}

inline intvec<float, 1> intvec<float, 1>::bitifthen(intvec_t x,
                                                    intvec_t y) const {
  return MF::vml_bitifthen(*this, x, y);
}

inline realvec<float, 1> intvec<float, 1>::convert_float() const {
  // return FP::convert_float(v);
  return _mm_cvtss_f32(_mm_cvtsi32_ss(_mm_setzero_ps(), v));
}

inline intvec<float, 1> intvec<float, 1>::rotate(int_t n) const {
  return MF::vml_rotate(*this, n);
}

inline intvec<float, 1> intvec<float, 1>::rotate(intvec_t n) const {
  return MF::vml_rotate(*this, n);
}

} // namespace vecmathlib

#endif // #ifndef VEC_SSE_FLOAT1_H