/*
 * Copyright (c) 2018, Alliance for Open Media. All rights reserved.
 *
 * This source code is subject to the terms of the BSD 2 Clause License and
 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
 * was not distributed with this source code in the LICENSE file, you can
 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
 * Media Patent License 1.0 was not distributed with this source code in the
 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
 */

#ifndef AOM_AOM_DSP_X86_TXFM_COMMON_AVX2_H_
#define AOM_AOM_DSP_X86_TXFM_COMMON_AVX2_H_

#include <emmintrin.h>
#include "aom/aom_integer.h"
#include "aom_dsp/x86/synonyms.h"

#ifdef __cplusplus
extern "C" {
#endif

static inline __m256i pair_set_w16_epi16(int16_t a, int16_t b) {
  return _mm256_set1_epi32(
      (int32_t)(((uint16_t)(a)) | (((uint32_t)(uint16_t)(b)) << 16)));
}

static inline void btf_16_w16_avx2(const __m256i w0, const __m256i w1,
                                   __m256i *in0, __m256i *in1, const __m256i _r,
                                   const int32_t cos_bit) {
  __m256i t0 = _mm256_unpacklo_epi16(*in0, *in1);
  __m256i t1 = _mm256_unpackhi_epi16(*in0, *in1);
  __m256i u0 = _mm256_madd_epi16(t0, w0);
  __m256i u1 = _mm256_madd_epi16(t1, w0);
  __m256i v0 = _mm256_madd_epi16(t0, w1);
  __m256i v1 = _mm256_madd_epi16(t1, w1);

  __m256i a0 = _mm256_add_epi32(u0, _r);
  __m256i a1 = _mm256_add_epi32(u1, _r);
  __m256i b0 = _mm256_add_epi32(v0, _r);
  __m256i b1 = _mm256_add_epi32(v1, _r);

  __m256i c0 = _mm256_srai_epi32(a0, cos_bit);
  __m256i c1 = _mm256_srai_epi32(a1, cos_bit);
  __m256i d0 = _mm256_srai_epi32(b0, cos_bit);
  __m256i d1 = _mm256_srai_epi32(b1, cos_bit);

  *in0 = _mm256_packs_epi32(c0, c1);
  *in1 = _mm256_packs_epi32(d0, d1);
}

static inline void btf_16_adds_subs_avx2(__m256i *in0, __m256i *in1) {
  const __m256i _in0 = *in0;
  const __m256i _in1 = *in1;
  *in0 = _mm256_adds_epi16(_in0, _in1);
  *in1 = _mm256_subs_epi16(_in0, _in1);
}

static inline void btf_32_add_sub_avx2(__m256i *in0, __m256i *in1) {
  const __m256i _in0 = *in0;
  const __m256i _in1 = *in1;
  *in0 = _mm256_add_epi32(_in0, _in1);
  *in1 = _mm256_sub_epi32(_in0, _in1);
}

static inline void btf_16_adds_subs_out_avx2(__m256i *out0, __m256i *out1,
                                             __m256i in0, __m256i in1) {
  const __m256i _in0 = in0;
  const __m256i _in1 = in1;
  *out0 = _mm256_adds_epi16(_in0, _in1);
  *out1 = _mm256_subs_epi16(_in0, _in1);
}

static inline void btf_32_add_sub_out_avx2(__m256i *out0, __m256i *out1,
                                           __m256i in0, __m256i in1) {
  const __m256i _in0 = in0;
  const __m256i _in1 = in1;
  *out0 = _mm256_add_epi32(_in0, _in1);
  *out1 = _mm256_sub_epi32(_in0, _in1);
}

static inline __m256i load_16bit_to_16bit_avx2(const int16_t *a) {
  return _mm256_load_si256((const __m256i *)a);
}

static inline void load_buffer_16bit_to_16bit_avx2(const int16_t *in,
                                                   int stride, __m256i *out,
                                                   int out_size) {
  for (int i = 0; i < out_size; ++i) {
    out[i] = load_16bit_to_16bit_avx2(in + i * stride);
  }
}

static inline void load_buffer_16bit_to_16bit_flip_avx2(const int16_t *in,
                                                        int stride,
                                                        __m256i *out,
                                                        int out_size) {
  for (int i = 0; i < out_size; ++i) {
    out[out_size - i - 1] = load_16bit_to_16bit_avx2(in + i * stride);
  }
}

static inline __m256i load_32bit_to_16bit_w16_avx2(const int32_t *a) {
  const __m256i a_low = _mm256_lddqu_si256((const __m256i *)a);
  const __m256i b = _mm256_packs_epi32(a_low, *(const __m256i *)(a + 8));
  return _mm256_permute4x64_epi64(b, 0xD8);
}

static inline void load_buffer_32bit_to_16bit_w16_avx2(const int32_t *in,
                                                       int stride, __m256i *out,
                                                       int out_size) {
  for (int i = 0; i < out_size; ++i) {
    out[i] = load_32bit_to_16bit_w16_avx2(in + i * stride);
  }
}

static inline void transpose2_8x8_avx2(const __m256i *const in,
                                       __m256i *const out) {
  __m256i t[16], u[16];
  // (1st, 2nd) ==> (lo, hi)
  //   (0, 1)   ==>  (0, 1)
  //   (2, 3)   ==>  (2, 3)
  //   (4, 5)   ==>  (4, 5)
  //   (6, 7)   ==>  (6, 7)
  for (int i = 0; i < 4; i++) {
    t[2 * i] = _mm256_unpacklo_epi16(in[2 * i], in[2 * i + 1]);
    t[2 * i + 1] = _mm256_unpackhi_epi16(in[2 * i], in[2 * i + 1]);
  }

  // (1st, 2nd) ==> (lo, hi)
  //   (0, 2)   ==>  (0, 2)
  //   (1, 3)   ==>  (1, 3)
  //   (4, 6)   ==>  (4, 6)
  //   (5, 7)   ==>  (5, 7)
  for (int i = 0; i < 2; i++) {
    u[i] = _mm256_unpacklo_epi32(t[i], t[i + 2]);
    u[i + 2] = _mm256_unpackhi_epi32(t[i], t[i + 2]);

    u[i + 4] = _mm256_unpacklo_epi32(t[i + 4], t[i + 6]);
    u[i + 6] = _mm256_unpackhi_epi32(t[i + 4], t[i + 6]);
  }

  // (1st, 2nd) ==> (lo, hi)
  //   (0, 4)   ==>  (0, 1)
  //   (1, 5)   ==>  (4, 5)
  //   (2, 6)   ==>  (2, 3)
  //   (3, 7)   ==>  (6, 7)
  for (int i = 0; i < 2; i++) {
    out[2 * i] = _mm256_unpacklo_epi64(u[2 * i], u[2 * i + 4]);
    out[2 * i + 1] = _mm256_unpackhi_epi64(u[2 * i], u[2 * i + 4]);

    out[2 * i + 4] = _mm256_unpacklo_epi64(u[2 * i + 1], u[2 * i + 5]);
    out[2 * i + 5] = _mm256_unpackhi_epi64(u[2 * i + 1], u[2 * i + 5]);
  }
}

static inline void transpose_16bit_16x16_avx2(const __m256i *const in,
                                              __m256i *const out) {
  __m256i t[16];

#define LOADL(idx)                                                            \
  t[idx] = _mm256_castsi128_si256(_mm_load_si128((__m128i const *)&in[idx])); \
  t[idx] = _mm256_inserti128_si256(                                           \
      t[idx], _mm_load_si128((__m128i const *)&in[idx + 8]), 1);

#define LOADR(idx)                                                           \
  t[8 + idx] =                                                               \
      _mm256_castsi128_si256(_mm_load_si128((__m128i const *)&in[idx] + 1)); \
  t[8 + idx] = _mm256_inserti128_si256(                                      \
      t[8 + idx], _mm_load_si128((__m128i const *)&in[idx + 8] + 1), 1);

  // load left 8x16
  LOADL(0)
  LOADL(1)
  LOADL(2)
  LOADL(3)
  LOADL(4)
  LOADL(5)
  LOADL(6)
  LOADL(7)

  // load right 8x16
  LOADR(0)
  LOADR(1)
  LOADR(2)
  LOADR(3)
  LOADR(4)
  LOADR(5)
  LOADR(6)
  LOADR(7)

  // get the top 16x8 result
  transpose2_8x8_avx2(t, out);
  // get the bottom 16x8 result
  transpose2_8x8_avx2(&t[8], &out[8]);
}

static inline void transpose_16bit_16x8_avx2(const __m256i *const in,
                                             __m256i *const out) {
  const __m256i a0 = _mm256_unpacklo_epi16(in[0], in[1]);
  const __m256i a1 = _mm256_unpacklo_epi16(in[2], in[3]);
  const __m256i a2 = _mm256_unpacklo_epi16(in[4], in[5]);
  const __m256i a3 = _mm256_unpacklo_epi16(in[6], in[7]);
  const __m256i a4 = _mm256_unpackhi_epi16(in[0], in[1]);
  const __m256i a5 = _mm256_unpackhi_epi16(in[2], in[3]);
  const __m256i a6 = _mm256_unpackhi_epi16(in[4], in[5]);
  const __m256i a7 = _mm256_unpackhi_epi16(in[6], in[7]);

  const __m256i b0 = _mm256_unpacklo_epi32(a0, a1);
  const __m256i b1 = _mm256_unpacklo_epi32(a2, a3);
  const __m256i b2 = _mm256_unpacklo_epi32(a4, a5);
  const __m256i b3 = _mm256_unpacklo_epi32(a6, a7);
  const __m256i b4 = _mm256_unpackhi_epi32(a0, a1);
  const __m256i b5 = _mm256_unpackhi_epi32(a2, a3);
  const __m256i b6 = _mm256_unpackhi_epi32(a4, a5);
  const __m256i b7 = _mm256_unpackhi_epi32(a6, a7);

  out[0] = _mm256_unpacklo_epi64(b0, b1);
  out[1] = _mm256_unpackhi_epi64(b0, b1);
  out[2] = _mm256_unpacklo_epi64(b4, b5);
  out[3] = _mm256_unpackhi_epi64(b4, b5);
  out[4] = _mm256_unpacklo_epi64(b2, b3);
  out[5] = _mm256_unpackhi_epi64(b2, b3);
  out[6] = _mm256_unpacklo_epi64(b6, b7);
  out[7] = _mm256_unpackhi_epi64(b6, b7);
}

static inline void flip_buf_avx2(__m256i *in, __m256i *out, int size) {
  for (int i = 0; i < size; ++i) {
    out[size - i - 1] = in[i];
  }
}

static inline void round_shift_16bit_w16_avx2(__m256i *in, int size, int bit) {
  if (bit < 0) {
    bit = -bit;
    __m256i round = _mm256_set1_epi16(1 << (bit - 1));
    for (int i = 0; i < size; ++i) {
      in[i] = _mm256_adds_epi16(in[i], round);
      in[i] = _mm256_srai_epi16(in[i], bit);
    }
  } else if (bit > 0) {
    for (int i = 0; i < size; ++i) {
      in[i] = _mm256_slli_epi16(in[i], bit);
    }
  }
}

static inline __m256i round_shift_32_avx2(__m256i vec, int bit) {
  __m256i tmp, round;
  round = _mm256_set1_epi32(1 << (bit - 1));
  tmp = _mm256_add_epi32(vec, round);
  return _mm256_srai_epi32(tmp, bit);
}

static inline void round_shift_array_32_avx2(__m256i *input, __m256i *output,
                                             const int size, const int bit) {
  if (bit > 0) {
    int i;
    for (i = 0; i < size; i++) {
      output[i] = round_shift_32_avx2(input[i], bit);
    }
  } else {
    int i;
    for (i = 0; i < size; i++) {
      output[i] = _mm256_slli_epi32(input[i], -bit);
    }
  }
}

static inline void round_shift_rect_array_32_avx2(__m256i *input,
                                                  __m256i *output,
                                                  const int size, const int bit,
                                                  const int val) {
  const __m256i sqrt2 = _mm256_set1_epi32(val);
  if (bit > 0) {
    int i;
    for (i = 0; i < size; i++) {
      const __m256i r0 = round_shift_32_avx2(input[i], bit);
      const __m256i r1 = _mm256_mullo_epi32(sqrt2, r0);
      output[i] = round_shift_32_avx2(r1, NewSqrt2Bits);
    }
  } else {
    int i;
    for (i = 0; i < size; i++) {
      const __m256i r0 = _mm256_slli_epi32(input[i], -bit);
      const __m256i r1 = _mm256_mullo_epi32(sqrt2, r0);
      output[i] = round_shift_32_avx2(r1, NewSqrt2Bits);
    }
  }
}

static inline __m256i scale_round_avx2(const __m256i a, const int scale) {
  const __m256i scale_rounding =
      pair_set_w16_epi16(scale, 1 << (NewSqrt2Bits - 1));
  const __m256i b = _mm256_madd_epi16(a, scale_rounding);
  return _mm256_srai_epi32(b, NewSqrt2Bits);
}

static inline void store_rect_16bit_to_32bit_w8_avx2(const __m256i a,
                                                     int32_t *const b) {
  const __m256i one = _mm256_set1_epi16(1);
  const __m256i a_lo = _mm256_unpacklo_epi16(a, one);
  const __m256i a_hi = _mm256_unpackhi_epi16(a, one);
  const __m256i b_lo = scale_round_avx2(a_lo, NewSqrt2);
  const __m256i b_hi = scale_round_avx2(a_hi, NewSqrt2);
  const __m256i temp = _mm256_permute2f128_si256(b_lo, b_hi, 0x31);
  _mm_store_si128((__m128i *)b, _mm256_castsi256_si128(b_lo));
  _mm_store_si128((__m128i *)(b + 4), _mm256_castsi256_si128(b_hi));
  _mm256_store_si256((__m256i *)(b + 64), temp);
}

static inline void store_rect_buffer_16bit_to_32bit_w8_avx2(
    const __m256i *const in, int32_t *const out, const int stride,
    const int out_size) {
  for (int i = 0; i < out_size; ++i) {
    store_rect_16bit_to_32bit_w8_avx2(in[i], out + i * stride);
  }
}

static inline void pack_reg(const __m128i *in1, const __m128i *in2,
                            __m256i *out) {
  out[0] = _mm256_insertf128_si256(_mm256_castsi128_si256(in1[0]), in2[0], 0x1);
  out[1] = _mm256_insertf128_si256(_mm256_castsi128_si256(in1[1]), in2[1], 0x1);
  out[2] = _mm256_insertf128_si256(_mm256_castsi128_si256(in1[2]), in2[2], 0x1);
  out[3] = _mm256_insertf128_si256(_mm256_castsi128_si256(in1[3]), in2[3], 0x1);
  out[4] = _mm256_insertf128_si256(_mm256_castsi128_si256(in1[4]), in2[4], 0x1);
  out[5] = _mm256_insertf128_si256(_mm256_castsi128_si256(in1[5]), in2[5], 0x1);
  out[6] = _mm256_insertf128_si256(_mm256_castsi128_si256(in1[6]), in2[6], 0x1);
  out[7] = _mm256_insertf128_si256(_mm256_castsi128_si256(in1[7]), in2[7], 0x1);
}

static inline void extract_reg(const __m256i *in, __m128i *out1) {
  out1[0] = _mm256_castsi256_si128(in[0]);
  out1[1] = _mm256_castsi256_si128(in[1]);
  out1[2] = _mm256_castsi256_si128(in[2]);
  out1[3] = _mm256_castsi256_si128(in[3]);
  out1[4] = _mm256_castsi256_si128(in[4]);
  out1[5] = _mm256_castsi256_si128(in[5]);
  out1[6] = _mm256_castsi256_si128(in[6]);
  out1[7] = _mm256_castsi256_si128(in[7]);

  out1[8] = _mm256_extracti128_si256(in[0], 0x01);
  out1[9] = _mm256_extracti128_si256(in[1], 0x01);
  out1[10] = _mm256_extracti128_si256(in[2], 0x01);
  out1[11] = _mm256_extracti128_si256(in[3], 0x01);
  out1[12] = _mm256_extracti128_si256(in[4], 0x01);
  out1[13] = _mm256_extracti128_si256(in[5], 0x01);
  out1[14] = _mm256_extracti128_si256(in[6], 0x01);
  out1[15] = _mm256_extracti128_si256(in[7], 0x01);
}

#ifdef __cplusplus
}
#endif

#endif  // AOM_AOM_DSP_X86_TXFM_COMMON_AVX2_H_