/*
 * Copyright 2011-2013 Intel Corporation
 * Modifications Copyright 2014, Blender Foundation.
 *
 * Licensed under the Apache License, Version 2.0(the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef __UTIL_SSEI_H__
#define __UTIL_SSEI_H__

CCL_NAMESPACE_BEGIN

#ifdef __KERNEL_SSE2__

struct sseb;
struct ssef;

/*! 4-wide SSE integer type. */
struct ssei {
  typedef sseb Mask;   // mask type
  typedef ssei Int;    // int type
  typedef ssef Float;  // float type

  enum { size = 4 };  // number of SIMD elements
  union {
    __m128i m128;
    int32_t i[4];
  };  // data

  ////////////////////////////////////////////////////////////////////////////////
  /// Constructors, Assignment & Cast Operators
  ////////////////////////////////////////////////////////////////////////////////

  __forceinline ssei()
  {
  }
  __forceinline ssei(const ssei &a)
  {
    m128 = a.m128;
  }
  __forceinline ssei &operator=(const ssei &a)
  {
    m128 = a.m128;
    return *this;
  }

  __forceinline ssei(const __m128i a) : m128(a)
  {
  }
  __forceinline operator const __m128i &(void) const
  {
    return m128;
  }
  __forceinline operator __m128i &(void)
  {
    return m128;
  }

  __forceinline ssei(const int a) : m128(_mm_set1_epi32(a))
  {
  }
  __forceinline ssei(int a, int b, int c, int d) : m128(_mm_setr_epi32(a, b, c, d))
  {
  }

  __forceinline explicit ssei(const __m128 a) : m128(_mm_cvtps_epi32(a))
  {
  }

  ////////////////////////////////////////////////////////////////////////////////
  /// Array Access
  ////////////////////////////////////////////////////////////////////////////////

  __forceinline const int32_t &operator[](const size_t index) const
  {
    assert(index < 4);
    return i[index];
  }
  __forceinline int32_t &operator[](const size_t index)
  {
    assert(index < 4);
    return i[index];
  }
};

////////////////////////////////////////////////////////////////////////////////
/// Unary Operators
////////////////////////////////////////////////////////////////////////////////

__forceinline const ssei cast(const __m128 &a)
{
  return _mm_castps_si128(a);
}
__forceinline const ssei operator+(const ssei &a)
{
  return a;
}
__forceinline const ssei operator-(const ssei &a)
{
  return _mm_sub_epi32(_mm_setzero_si128(), a.m128);
}
#  if defined(__KERNEL_SSSE3__)
__forceinline const ssei abs(const ssei &a)
{
  return _mm_abs_epi32(a.m128);
}
#  endif

////////////////////////////////////////////////////////////////////////////////
/// Binary Operators
////////////////////////////////////////////////////////////////////////////////

__forceinline const ssei operator+(const ssei &a, const ssei &b)
{
  return _mm_add_epi32(a.m128, b.m128);
}
__forceinline const ssei operator+(const ssei &a, const int32_t &b)
{
  return a + ssei(b);
}
__forceinline const ssei operator+(const int32_t &a, const ssei &b)
{
  return ssei(a) + b;
}

__forceinline const ssei operator-(const ssei &a, const ssei &b)
{
  return _mm_sub_epi32(a.m128, b.m128);
}
__forceinline const ssei operator-(const ssei &a, const int32_t &b)
{
  return a - ssei(b);
}
__forceinline const ssei operator-(const int32_t &a, const ssei &b)
{
  return ssei(a) - b;
}

#  if defined(__KERNEL_SSE41__)
__forceinline const ssei operator*(const ssei &a, const ssei &b)
{
  return _mm_mullo_epi32(a.m128, b.m128);
}
__forceinline const ssei operator*(const ssei &a, const int32_t &b)
{
  return a * ssei(b);
}
__forceinline const ssei operator*(const int32_t &a, const ssei &b)
{
  return ssei(a) * b;
}
#  endif

__forceinline const ssei operator&(const ssei &a, const ssei &b)
{
  return _mm_and_si128(a.m128, b.m128);
}
__forceinline const ssei operator&(const ssei &a, const int32_t &b)
{
  return a & ssei(b);
}
__forceinline const ssei operator&(const int32_t &a, const ssei &b)
{
  return ssei(a) & b;
}

__forceinline const ssei operator|(const ssei &a, const ssei &b)
{
  return _mm_or_si128(a.m128, b.m128);
}
__forceinline const ssei operator|(const ssei &a, const int32_t &b)
{
  return a | ssei(b);
}
__forceinline const ssei operator|(const int32_t &a, const ssei &b)
{
  return ssei(a) | b;
}

__forceinline const ssei operator^(const ssei &a, const ssei &b)
{
  return _mm_xor_si128(a.m128, b.m128);
}
__forceinline const ssei operator^(const ssei &a, const int32_t &b)
{
  return a ^ ssei(b);
}
__forceinline const ssei operator^(const int32_t &a, const ssei &b)
{
  return ssei(a) ^ b;
}

__forceinline const ssei operator<<(const ssei &a, const int32_t &n)
{
  return _mm_slli_epi32(a.m128, n);
}
__forceinline const ssei operator>>(const ssei &a, const int32_t &n)
{
  return _mm_srai_epi32(a.m128, n);
}

__forceinline const ssei andnot(const ssei &a, const ssei &b)
{
  return _mm_andnot_si128(a.m128, b.m128);
}
__forceinline const ssei andnot(const sseb &a, const ssei &b)
{
  return _mm_andnot_si128(cast(a.m128), b.m128);
}
__forceinline const ssei andnot(const ssei &a, const sseb &b)
{
  return _mm_andnot_si128(a.m128, cast(b.m128));
}

__forceinline const ssei sra(const ssei &a, const int32_t &b)
{
  return _mm_srai_epi32(a.m128, b);
}
__forceinline const ssei srl(const ssei &a, const int32_t &b)
{
  return _mm_srli_epi32(a.m128, b);
}

#  if defined(__KERNEL_SSE41__)
__forceinline const ssei min(const ssei &a, const ssei &b)
{
  return _mm_min_epi32(a.m128, b.m128);
}
__forceinline const ssei min(const ssei &a, const int32_t &b)
{
  return min(a, ssei(b));
}
__forceinline const ssei min(const int32_t &a, const ssei &b)
{
  return min(ssei(a), b);
}

__forceinline const ssei max(const ssei &a, const ssei &b)
{
  return _mm_max_epi32(a.m128, b.m128);
}
__forceinline const ssei max(const ssei &a, const int32_t &b)
{
  return max(a, ssei(b));
}
__forceinline const ssei max(const int32_t &a, const ssei &b)
{
  return max(ssei(a), b);
}
#  endif

////////////////////////////////////////////////////////////////////////////////
/// Assignment Operators
////////////////////////////////////////////////////////////////////////////////

__forceinline ssei &operator+=(ssei &a, const ssei &b)
{
  return a = a + b;
}
__forceinline ssei &operator+=(ssei &a, const int32_t &b)
{
  return a = a + b;
}

__forceinline ssei &operator-=(ssei &a, const ssei &b)
{
  return a = a - b;
}
__forceinline ssei &operator-=(ssei &a, const int32_t &b)
{
  return a = a - b;
}

#  if defined(__KERNEL_SSE41__)
__forceinline ssei &operator*=(ssei &a, const ssei &b)
{
  return a = a * b;
}
__forceinline ssei &operator*=(ssei &a, const int32_t &b)
{
  return a = a * b;
}
#  endif

__forceinline ssei &operator&=(ssei &a, const ssei &b)
{
  return a = a & b;
}
__forceinline ssei &operator&=(ssei &a, const int32_t &b)
{
  return a = a & b;
}

__forceinline ssei &operator|=(ssei &a, const ssei &b)
{
  return a = a | b;
}
__forceinline ssei &operator|=(ssei &a, const int32_t &b)
{
  return a = a | b;
}

__forceinline ssei &operator^=(ssei &a, const ssei &b)
{
  return a = a ^ b;
}
__forceinline ssei &operator^=(ssei &a, const int32_t &b)
{
  return a = a ^ b;
}

__forceinline ssei &operator<<=(ssei &a, const int32_t &b)
{
  return a = a << b;
}
__forceinline ssei &operator>>=(ssei &a, const int32_t &b)
{
  return a = a >> b;
}

////////////////////////////////////////////////////////////////////////////////
/// Comparison Operators + Select
////////////////////////////////////////////////////////////////////////////////

__forceinline const sseb operator==(const ssei &a, const ssei &b)
{
  return _mm_castsi128_ps(_mm_cmpeq_epi32(a.m128, b.m128));
}
__forceinline const sseb operator==(const ssei &a, const int32_t &b)
{
  return a == ssei(b);
}
__forceinline const sseb operator==(const int32_t &a, const ssei &b)
{
  return ssei(a) == b;
}

__forceinline const sseb operator!=(const ssei &a, const ssei &b)
{
  return !(a == b);
}
__forceinline const sseb operator!=(const ssei &a, const int32_t &b)
{
  return a != ssei(b);
}
__forceinline const sseb operator!=(const int32_t &a, const ssei &b)
{
  return ssei(a) != b;
}

__forceinline const sseb operator<(const ssei &a, const ssei &b)
{
  return _mm_castsi128_ps(_mm_cmplt_epi32(a.m128, b.m128));
}
__forceinline const sseb operator<(const ssei &a, const int32_t &b)
{
  return a < ssei(b);
}
__forceinline const sseb operator<(const int32_t &a, const ssei &b)
{
  return ssei(a) < b;
}

__forceinline const sseb operator>=(const ssei &a, const ssei &b)
{
  return !(a < b);
}
__forceinline const sseb operator>=(const ssei &a, const int32_t &b)
{
  return a >= ssei(b);
}
__forceinline const sseb operator>=(const int32_t &a, const ssei &b)
{
  return ssei(a) >= b;
}

__forceinline const sseb operator>(const ssei &a, const ssei &b)
{
  return _mm_castsi128_ps(_mm_cmpgt_epi32(a.m128, b.m128));
}
__forceinline const sseb operator>(const ssei &a, const int32_t &b)
{
  return a > ssei(b);
}
__forceinline const sseb operator>(const int32_t &a, const ssei &b)
{
  return ssei(a) > b;
}

__forceinline const sseb operator<=(const ssei &a, const ssei &b)
{
  return !(a > b);
}
__forceinline const sseb operator<=(const ssei &a, const int32_t &b)
{
  return a <= ssei(b);
}
__forceinline const sseb operator<=(const int32_t &a, const ssei &b)
{
  return ssei(a) <= b;
}

__forceinline const ssei select(const sseb &m, const ssei &t, const ssei &f)
{
#  ifdef __KERNEL_SSE41__
  return _mm_castps_si128(_mm_blendv_ps(_mm_castsi128_ps(f), _mm_castsi128_ps(t), m));
#  else
  return _mm_or_si128(_mm_and_si128(m, t), _mm_andnot_si128(m, f));
#  endif
}

__forceinline const ssei select(const int mask, const ssei &t, const ssei &f)
{
#  if defined(__KERNEL_SSE41__) && \
      ((!defined(__clang__) && !defined(_MSC_VER)) || defined(__INTEL_COMPILER))
  return _mm_castps_si128(_mm_blend_ps(_mm_castsi128_ps(f), _mm_castsi128_ps(t), mask));
#  else
  return select(sseb(mask), t, f);
#  endif
}

////////////////////////////////////////////////////////////////////////////////
// Movement/Shifting/Shuffling Functions
////////////////////////////////////////////////////////////////////////////////

__forceinline ssei unpacklo(const ssei &a, const ssei &b)
{
  return _mm_unpacklo_epi32(a, b);
}
__forceinline ssei unpackhi(const ssei &a, const ssei &b)
{
  return _mm_unpackhi_epi32(a, b);
}

template<size_t i0, size_t i1, size_t i2, size_t i3>
__forceinline const ssei shuffle(const ssei &a)
{
  return _mm_shuffle_epi32(a, _MM_SHUFFLE(i3, i2, i1, i0));
}

template<size_t i0, size_t i1, size_t i2, size_t i3>
__forceinline const ssei shuffle(const ssei &a, const ssei &b)
{
  return _mm_castps_si128(
      _mm_shuffle_ps(_mm_castsi128_ps(a), _mm_castsi128_ps(b), _MM_SHUFFLE(i3, i2, i1, i0)));
}

template<size_t i0> __forceinline const ssei shuffle(const ssei &b)
{
  return shuffle<i0, i0, i0, i0>(b);
}

#  if defined(__KERNEL_SSE41__)
template<size_t src> __forceinline int extract(const ssei &b)
{
  return _mm_extract_epi32(b, src);
}
template<size_t dst> __forceinline const ssei insert(const ssei &a, const int32_t b)
{
  return _mm_insert_epi32(a, b, dst);
}
#  else
template<size_t src> __forceinline int extract(const ssei &b)
{
  return b[src];
}
template<size_t dst> __forceinline const ssei insert(const ssei &a, const int32_t b)
{
  ssei c = a;
  c[dst] = b;
  return c;
}
#  endif

////////////////////////////////////////////////////////////////////////////////
/// Reductions
////////////////////////////////////////////////////////////////////////////////

#  if defined(__KERNEL_SSE41__)
__forceinline const ssei vreduce_min(const ssei &v)
{
  ssei h = min(shuffle<1, 0, 3, 2>(v), v);
  return min(shuffle<2, 3, 0, 1>(h), h);
}
__forceinline const ssei vreduce_max(const ssei &v)
{
  ssei h = max(shuffle<1, 0, 3, 2>(v), v);
  return max(shuffle<2, 3, 0, 1>(h), h);
}
__forceinline const ssei vreduce_add(const ssei &v)
{
  ssei h = shuffle<1, 0, 3, 2>(v) + v;
  return shuffle<2, 3, 0, 1>(h) + h;
}

__forceinline int reduce_min(const ssei &v)
{
  return extract<0>(vreduce_min(v));
}
__forceinline int reduce_max(const ssei &v)
{
  return extract<0>(vreduce_max(v));
}
__forceinline int reduce_add(const ssei &v)
{
  return extract<0>(vreduce_add(v));
}

__forceinline size_t select_min(const ssei &v)
{
  return __bsf(movemask(v == vreduce_min(v)));
}
__forceinline size_t select_max(const ssei &v)
{
  return __bsf(movemask(v == vreduce_max(v)));
}

__forceinline size_t select_min(const sseb &valid, const ssei &v)
{
  const ssei a = select(valid, v, ssei((int)pos_inf));
  return __bsf(movemask(valid & (a == vreduce_min(a))));
}
__forceinline size_t select_max(const sseb &valid, const ssei &v)
{
  const ssei a = select(valid, v, ssei((int)neg_inf));
  return __bsf(movemask(valid & (a == vreduce_max(a))));
}

#  else

__forceinline int ssei_min(int a, int b)
{
  return (a < b) ? a : b;
}
__forceinline int ssei_max(int a, int b)
{
  return (a > b) ? a : b;
}
__forceinline int reduce_min(const ssei &v)
{
  return ssei_min(ssei_min(v[0], v[1]), ssei_min(v[2], v[3]));
}
__forceinline int reduce_max(const ssei &v)
{
  return ssei_max(ssei_max(v[0], v[1]), ssei_max(v[2], v[3]));
}
__forceinline int reduce_add(const ssei &v)
{
  return v[0] + v[1] + v[2] + v[3];
}

#  endif

////////////////////////////////////////////////////////////////////////////////
/// Memory load and store operations
////////////////////////////////////////////////////////////////////////////////

__forceinline ssei load4i(const void *const a)
{
  return _mm_load_si128((__m128i *)a);
}

__forceinline void store4i(void *ptr, const ssei &v)
{
  _mm_store_si128((__m128i *)ptr, v);
}

__forceinline void storeu4i(void *ptr, const ssei &v)
{
  _mm_storeu_si128((__m128i *)ptr, v);
}

__forceinline void store4i(const sseb &mask, void *ptr, const ssei &i)
{
#  if defined(__KERNEL_AVX__)
  _mm_maskstore_ps((float *)ptr, (__m128i)mask, _mm_castsi128_ps(i));
#  else
  *(ssei *)ptr = select(mask, i, *(ssei *)ptr);
#  endif
}

__forceinline ssei load4i_nt(void *ptr)
{
#  if defined(__KERNEL_SSE41__)
  return _mm_stream_load_si128((__m128i *)ptr);
#  else
  return _mm_load_si128((__m128i *)ptr);
#  endif
}

__forceinline void store4i_nt(void *ptr, const ssei &v)
{
#  if defined(__KERNEL_SSE41__)
  _mm_stream_ps((float *)ptr, _mm_castsi128_ps(v));
#  else
  _mm_store_si128((__m128i *)ptr, v);
#  endif
}

////////////////////////////////////////////////////////////////////////////////
/// Debug Functions
////////////////////////////////////////////////////////////////////////////////

ccl_device_inline void print_ssei(const char *label, const ssei &a)
{
  printf("%s: %df %df %df %d\n", label, a[0], a[1], a[2], a[3]);
}

#endif

CCL_NAMESPACE_END

#endif
