/*

 * Copyright (c) 2020, 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.

 */

#include <immintrin.h>

#include "config/aom_dsp_rtcd.h"

#include "aom/aom_integer.h"

#include "aom_dsp/x86/bitdepth_conversion_sse2.h"

#include "aom_dsp/x86/quantize_x86.h"

static inline void calculate_dqcoeff_and_store(__m128i qcoeff, __m128i dequant,

                                               tran_low_t *dqcoeff) {

  const __m128i low = _mm_mullo_epi16(qcoeff, dequant);

  const __m128i high = _mm_mulhi_epi16(qcoeff, dequant);

  const __m128i dqcoeff32_0 = _mm_unpacklo_epi16(low, high);

  const __m128i dqcoeff32_1 = _mm_unpackhi_epi16(low, high);

  _mm_store_si128((__m128i *)(dqcoeff), dqcoeff32_0);

  _mm_store_si128((__m128i *)(dqcoeff + 4), dqcoeff32_1);

}

void aom_quantize_b_avx(const tran_low_t *coeff_ptr, intptr_t n_coeffs,

                        const int16_t *zbin_ptr, const int16_t *round_ptr,

                        const int16_t *quant_ptr,

                        const int16_t *quant_shift_ptr, tran_low_t *qcoeff_ptr,

                        tran_low_t *dqcoeff_ptr, const int16_t *dequant_ptr,

                        uint16_t *eob_ptr, const int16_t *scan,

                        const int16_t *iscan) {

  const __m128i zero = _mm_setzero_si128();

  const __m256i big_zero = _mm256_setzero_si256();

  int index;

  __m128i zbin, round, quant, dequant, shift;

  __m128i coeff0, coeff1;

  __m128i qcoeff0, qcoeff1;

  __m128i cmp_mask0, cmp_mask1;

  __m128i all_zero;

  __m128i eob = zero, eob0;

  (void)scan;

  *eob_ptr = 0;

  load_b_values(zbin_ptr, &zbin, round_ptr, &round, quant_ptr, &quant,

                dequant_ptr, &dequant, quant_shift_ptr, &shift);

  // Do DC and first 15 AC.

  coeff0 = load_tran_low(coeff_ptr);

  coeff1 = load_tran_low(coeff_ptr + 8);

  qcoeff0 = _mm_abs_epi16(coeff0);

  qcoeff1 = _mm_abs_epi16(coeff1);

  cmp_mask0 = _mm_cmpgt_epi16(qcoeff0, zbin);

  zbin = _mm_unpackhi_epi64(zbin, zbin);  // Switch DC to AC

  cmp_mask1 = _mm_cmpgt_epi16(qcoeff1, zbin);

  all_zero = _mm_or_si128(cmp_mask0, cmp_mask1);

  if (_mm_test_all_zeros(all_zero, all_zero)) {

    _mm256_store_si256((__m256i *)(qcoeff_ptr), big_zero);

    _mm256_store_si256((__m256i *)(dqcoeff_ptr), big_zero);

    _mm256_store_si256((__m256i *)(qcoeff_ptr + 8), big_zero);

    _mm256_store_si256((__m256i *)(dqcoeff_ptr + 8), big_zero);

    if (n_coeffs == 16) return;

    round = _mm_unpackhi_epi64(round, round);

    quant = _mm_unpackhi_epi64(quant, quant);

    shift = _mm_unpackhi_epi64(shift, shift);

    dequant = _mm_unpackhi_epi64(dequant, dequant);

  } else {

    calculate_qcoeff(&qcoeff0, round, quant, shift);

    round = _mm_unpackhi_epi64(round, round);

    quant = _mm_unpackhi_epi64(quant, quant);

    shift = _mm_unpackhi_epi64(shift, shift);

    calculate_qcoeff(&qcoeff1, round, quant, shift);

    // Reinsert signs

    qcoeff0 = _mm_sign_epi16(qcoeff0, coeff0);

    qcoeff1 = _mm_sign_epi16(qcoeff1, coeff1);

    // Mask out zbin threshold coeffs

    qcoeff0 = _mm_and_si128(qcoeff0, cmp_mask0);

    qcoeff1 = _mm_and_si128(qcoeff1, cmp_mask1);

    store_tran_low(qcoeff0, qcoeff_ptr);

    store_tran_low(qcoeff1, qcoeff_ptr + 8);

    calculate_dqcoeff_and_store(qcoeff0, dequant, dqcoeff_ptr);

    dequant = _mm_unpackhi_epi64(dequant, dequant);

    calculate_dqcoeff_and_store(qcoeff1, dequant, dqcoeff_ptr + 8);

    eob =

        scan_for_eob(&qcoeff0, &qcoeff1, cmp_mask0, cmp_mask1, iscan, 0, zero);

  }

  // AC only loop.

  for (index = 16; index < n_coeffs; index += 16) {

    coeff0 = load_tran_low(coeff_ptr + index);

    coeff1 = load_tran_low(coeff_ptr + index + 8);

    qcoeff0 = _mm_abs_epi16(coeff0);

    qcoeff1 = _mm_abs_epi16(coeff1);

    cmp_mask0 = _mm_cmpgt_epi16(qcoeff0, zbin);

    cmp_mask1 = _mm_cmpgt_epi16(qcoeff1, zbin);

    all_zero = _mm_or_si128(cmp_mask0, cmp_mask1);

    if (_mm_test_all_zeros(all_zero, all_zero)) {

      _mm256_store_si256((__m256i *)(qcoeff_ptr + index), big_zero);

      _mm256_store_si256((__m256i *)(dqcoeff_ptr + index), big_zero);

      _mm256_store_si256((__m256i *)(qcoeff_ptr + index + 8), big_zero);

      _mm256_store_si256((__m256i *)(dqcoeff_ptr + index + 8), big_zero);

      continue;

    }

    calculate_qcoeff(&qcoeff0, round, quant, shift);

    calculate_qcoeff(&qcoeff1, round, quant, shift);

    qcoeff0 = _mm_sign_epi16(qcoeff0, coeff0);

    qcoeff1 = _mm_sign_epi16(qcoeff1, coeff1);

    qcoeff0 = _mm_and_si128(qcoeff0, cmp_mask0);

    qcoeff1 = _mm_and_si128(qcoeff1, cmp_mask1);

    store_tran_low(qcoeff0, qcoeff_ptr + index);

    store_tran_low(qcoeff1, qcoeff_ptr + index + 8);

    calculate_dqcoeff_and_store(qcoeff0, dequant, dqcoeff_ptr + index);

    calculate_dqcoeff_and_store(qcoeff1, dequant, dqcoeff_ptr + index + 8);

    eob0 = scan_for_eob(&qcoeff0, &qcoeff1, cmp_mask0, cmp_mask1, iscan, index,

                        zero);

    eob = _mm_max_epi16(eob, eob0);

  }

  *eob_ptr = accumulate_eob(eob);

}

void aom_quantize_b_32x32_avx(const tran_low_t *coeff_ptr, intptr_t n_coeffs,

                              const int16_t *zbin_ptr, const int16_t *round_ptr,

                              const int16_t *quant_ptr,

                              const int16_t *quant_shift_ptr,

                              tran_low_t *qcoeff_ptr, tran_low_t *dqcoeff_ptr,

                              const int16_t *dequant_ptr, uint16_t *eob_ptr,

                              const int16_t *scan, const int16_t *iscan) {

  const __m128i zero = _mm_setzero_si128();

  const __m128i one = _mm_set1_epi16(1);

  const __m256i big_zero = _mm256_setzero_si256();

  int index;

  const int log_scale = 1;

  __m128i zbin, round, quant, dequant, shift;

  __m128i coeff0, coeff1;

  __m128i qcoeff0, qcoeff1;

  __m128i cmp_mask0, cmp_mask1;

  __m128i all_zero;

  __m128i eob = zero, eob0;

  (void)scan;

  // Setup global values.

  // The 32x32 halves zbin and round.

  zbin = _mm_load_si128((const __m128i *)zbin_ptr);

  // Shift with rounding.

  zbin = _mm_add_epi16(zbin, one);

  zbin = _mm_srli_epi16(zbin, 1);

  // x86 has no "greater *or equal*" comparison. Subtract 1 from zbin so

  // it is a strict "greater" comparison.

  zbin = _mm_sub_epi16(zbin, one);

  round = _mm_load_si128((const __m128i *)round_ptr);

  round = _mm_add_epi16(round, one);

  round = _mm_srli_epi16(round, 1);

  quant = _mm_load_si128((const __m128i *)quant_ptr);

  dequant = _mm_load_si128((const __m128i *)dequant_ptr);

  shift = _mm_load_si128((const __m128i *)quant_shift_ptr);

  // Do DC and first 15 AC.

  coeff0 = load_tran_low(coeff_ptr);

  coeff1 = load_tran_low(coeff_ptr + 8);

  qcoeff0 = _mm_abs_epi16(coeff0);

  qcoeff1 = _mm_abs_epi16(coeff1);

  cmp_mask0 = _mm_cmpgt_epi16(qcoeff0, zbin);

  zbin = _mm_unpackhi_epi64(zbin, zbin);  // Switch DC to AC.

  cmp_mask1 = _mm_cmpgt_epi16(qcoeff1, zbin);

  all_zero = _mm_or_si128(cmp_mask0, cmp_mask1);

  if (_mm_test_all_zeros(all_zero, all_zero)) {

    _mm256_store_si256((__m256i *)(qcoeff_ptr), big_zero);

    _mm256_store_si256((__m256i *)(dqcoeff_ptr), big_zero);

    _mm256_store_si256((__m256i *)(qcoeff_ptr + 8), big_zero);

    _mm256_store_si256((__m256i *)(dqcoeff_ptr + 8), big_zero);

    round = _mm_unpackhi_epi64(round, round);

    quant = _mm_unpackhi_epi64(quant, quant);

    shift = _mm_unpackhi_epi64(shift, shift);

    dequant = _mm_unpackhi_epi64(dequant, dequant);

  } else {

    calculate_qcoeff_log_scale(&qcoeff0, round, quant, &shift, &log_scale);

    round = _mm_unpackhi_epi64(round, round);

    quant = _mm_unpackhi_epi64(quant, quant);

    shift = _mm_unpackhi_epi64(shift, shift);

    calculate_qcoeff_log_scale(&qcoeff1, round, quant, &shift, &log_scale);

    // Reinsert signs.

    qcoeff0 = _mm_sign_epi16(qcoeff0, coeff0);

    qcoeff1 = _mm_sign_epi16(qcoeff1, coeff1);

    // Mask out zbin threshold coeffs.

    qcoeff0 = _mm_and_si128(qcoeff0, cmp_mask0);

    qcoeff1 = _mm_and_si128(qcoeff1, cmp_mask1);

    store_tran_low(qcoeff0, qcoeff_ptr);

    store_tran_low(qcoeff1, qcoeff_ptr + 8);

    calculate_dqcoeff_and_store_log_scale(qcoeff0, dequant, zero, dqcoeff_ptr,

                                          &log_scale);

    dequant = _mm_unpackhi_epi64(dequant, dequant);

    calculate_dqcoeff_and_store_log_scale(qcoeff1, dequant, zero,

                                          dqcoeff_ptr + 8, &log_scale);

    eob =

        scan_for_eob(&qcoeff0, &qcoeff1, cmp_mask0, cmp_mask1, iscan, 0, zero);

  }

  // AC only loop.

  for (index = 16; index < n_coeffs; index += 16) {

    coeff0 = load_tran_low(coeff_ptr + index);

    coeff1 = load_tran_low(coeff_ptr + index + 8);

    qcoeff0 = _mm_abs_epi16(coeff0);

    qcoeff1 = _mm_abs_epi16(coeff1);

    cmp_mask0 = _mm_cmpgt_epi16(qcoeff0, zbin);

    cmp_mask1 = _mm_cmpgt_epi16(qcoeff1, zbin);

    all_zero = _mm_or_si128(cmp_mask0, cmp_mask1);

    if (_mm_test_all_zeros(all_zero, all_zero)) {

      _mm256_store_si256((__m256i *)(qcoeff_ptr + index), big_zero);

      _mm256_store_si256((__m256i *)(dqcoeff_ptr + index), big_zero);

      _mm256_store_si256((__m256i *)(qcoeff_ptr + index + 8), big_zero);

      _mm256_store_si256((__m256i *)(dqcoeff_ptr + index + 8), big_zero);

      continue;

    }

    calculate_qcoeff_log_scale(&qcoeff0, round, quant, &shift, &log_scale);

    calculate_qcoeff_log_scale(&qcoeff1, round, quant, &shift, &log_scale);

    qcoeff0 = _mm_sign_epi16(qcoeff0, coeff0);

    qcoeff1 = _mm_sign_epi16(qcoeff1, coeff1);

    qcoeff0 = _mm_and_si128(qcoeff0, cmp_mask0);

    qcoeff1 = _mm_and_si128(qcoeff1, cmp_mask1);

    store_tran_low(qcoeff0, qcoeff_ptr + index);

    store_tran_low(qcoeff1, qcoeff_ptr + index + 8);

    calculate_dqcoeff_and_store_log_scale(qcoeff0, dequant, zero,

                                          dqcoeff_ptr + index, &log_scale);

    calculate_dqcoeff_and_store_log_scale(qcoeff1, dequant, zero,

                                          dqcoeff_ptr + index + 8, &log_scale);

    eob0 = scan_for_eob(&qcoeff0, &qcoeff1, cmp_mask0, cmp_mask1, iscan, index,

                        zero);

    eob = _mm_max_epi16(eob, eob0);

  }

  *eob_ptr = accumulate_eob(eob);

}