/*

 * Copyright (c) 2019, 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 <assert.h>

#include <emmintrin.h>

#include "config/aom_dsp_rtcd.h"

#include "aom/aom_integer.h"

#include "aom_dsp/quantize.h"

#include "aom_dsp/x86/quantize_x86.h"

void aom_quantize_b_adaptive_sse2(

    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) {

  int index = 16;

  int non_zero_count = 0;

  int non_zero_count_prescan_add_zero = 0;

  int is_found0 = 0, is_found1 = 0;

  int eob = -1;

  const __m128i zero = _mm_setzero_si128();

  __m128i zbin, round, quant, dequant, shift;

  __m128i coeff0, coeff1, coeff0_sign, coeff1_sign;

  __m128i qcoeff0, qcoeff1;

  __m128i cmp_mask0, cmp_mask1;

  __m128i all_zero;

  __m128i mask0 = zero, mask1 = zero;

  int prescan_add[2];

  int thresh[4];

  const qm_val_t wt = (1 << AOM_QM_BITS);

  for (int i = 0; i < 2; ++i) {

    prescan_add[i] = ROUND_POWER_OF_TWO(dequant_ptr[i] * EOB_FACTOR, 7);

    thresh[i] = (zbin_ptr[i] * wt + prescan_add[i]) - 1;

  }

  thresh[2] = thresh[3] = thresh[1];

  __m128i threshold[2];

  threshold[0] = _mm_loadu_si128((__m128i *)&thresh[0]);

  threshold[1] = _mm_unpackhi_epi64(threshold[0], threshold[0]);

#if SKIP_EOB_FACTOR_ADJUST

  int first = -1;

#endif

  // Setup global values.

  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_coefficients(coeff_ptr);

  coeff1 = load_coefficients(coeff_ptr + 8);

  // Poor man's abs().

  coeff0_sign = _mm_srai_epi16(coeff0, 15);

  coeff1_sign = _mm_srai_epi16(coeff1, 15);

  qcoeff0 = invert_sign_sse2(coeff0, coeff0_sign);

  qcoeff1 = invert_sign_sse2(coeff1, coeff1_sign);

  update_mask0(&qcoeff0, &qcoeff1, threshold, iscan, &is_found0, &mask0);

  cmp_mask0 = _mm_cmpgt_epi16(qcoeff0, zbin);

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

  cmp_mask1 = _mm_cmpgt_epi16(qcoeff1, zbin);

  update_mask1(&cmp_mask0, &cmp_mask1, iscan, &is_found1, &mask1);

  threshold[0] = threshold[1];

  all_zero = _mm_or_si128(cmp_mask0, cmp_mask1);

  if (_mm_movemask_epi8(all_zero) == 0) {

    _mm_store_si128((__m128i *)(qcoeff_ptr), zero);

    _mm_store_si128((__m128i *)(qcoeff_ptr + 4), zero);

    _mm_store_si128((__m128i *)(qcoeff_ptr + 8), zero);

    _mm_store_si128((__m128i *)(qcoeff_ptr + 12), zero);

    _mm_store_si128((__m128i *)(dqcoeff_ptr), zero);

    _mm_store_si128((__m128i *)(dqcoeff_ptr + 4), zero);

    _mm_store_si128((__m128i *)(dqcoeff_ptr + 8), zero);

    _mm_store_si128((__m128i *)(dqcoeff_ptr + 12), 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(&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 = invert_sign_sse2(qcoeff0, coeff0_sign);

    qcoeff1 = invert_sign_sse2(qcoeff1, coeff1_sign);

    // Mask out zbin threshold coeffs

    qcoeff0 = _mm_and_si128(qcoeff0, cmp_mask0);

    qcoeff1 = _mm_and_si128(qcoeff1, cmp_mask1);

    store_coefficients(qcoeff0, qcoeff_ptr);

    store_coefficients(qcoeff1, qcoeff_ptr + 8);

    coeff0 = calculate_dqcoeff(qcoeff0, dequant);

    dequant = _mm_unpackhi_epi64(dequant, dequant);

    coeff1 = calculate_dqcoeff(qcoeff1, dequant);

    store_coefficients(coeff0, dqcoeff_ptr);

    store_coefficients(coeff1, dqcoeff_ptr + 8);

  }

  // AC only loop.

  while (index < n_coeffs) {

    coeff0 = load_coefficients(coeff_ptr + index);

    coeff1 = load_coefficients(coeff_ptr + index + 8);

    coeff0_sign = _mm_srai_epi16(coeff0, 15);

    coeff1_sign = _mm_srai_epi16(coeff1, 15);

    qcoeff0 = invert_sign_sse2(coeff0, coeff0_sign);

    qcoeff1 = invert_sign_sse2(coeff1, coeff1_sign);

    update_mask0(&qcoeff0, &qcoeff1, threshold, iscan + index, &is_found0,

                 &mask0);

    cmp_mask0 = _mm_cmpgt_epi16(qcoeff0, zbin);

    cmp_mask1 = _mm_cmpgt_epi16(qcoeff1, zbin);

    update_mask1(&cmp_mask0, &cmp_mask1, iscan + index, &is_found1, &mask1);

    all_zero = _mm_or_si128(cmp_mask0, cmp_mask1);

    if (_mm_movemask_epi8(all_zero) == 0) {

      _mm_store_si128((__m128i *)(qcoeff_ptr + index), zero);

      _mm_store_si128((__m128i *)(qcoeff_ptr + index + 4), zero);

      _mm_store_si128((__m128i *)(qcoeff_ptr + index + 8), zero);

      _mm_store_si128((__m128i *)(qcoeff_ptr + index + 12), zero);

      _mm_store_si128((__m128i *)(dqcoeff_ptr + index), zero);

      _mm_store_si128((__m128i *)(dqcoeff_ptr + index + 4), zero);

      _mm_store_si128((__m128i *)(dqcoeff_ptr + index + 8), zero);

      _mm_store_si128((__m128i *)(dqcoeff_ptr + index + 12), zero);

      index += 16;

      continue;

    }

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

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

    qcoeff0 = invert_sign_sse2(qcoeff0, coeff0_sign);

    qcoeff1 = invert_sign_sse2(qcoeff1, coeff1_sign);

    qcoeff0 = _mm_and_si128(qcoeff0, cmp_mask0);

    qcoeff1 = _mm_and_si128(qcoeff1, cmp_mask1);

    store_coefficients(qcoeff0, qcoeff_ptr + index);

    store_coefficients(qcoeff1, qcoeff_ptr + index + 8);

    coeff0 = calculate_dqcoeff(qcoeff0, dequant);

    coeff1 = calculate_dqcoeff(qcoeff1, dequant);

    store_coefficients(coeff0, dqcoeff_ptr + index);

    store_coefficients(coeff1, dqcoeff_ptr + index + 8);

    index += 16;

  }

  if (is_found0) non_zero_count = calculate_non_zero_count(mask0);

  if (is_found1)

    non_zero_count_prescan_add_zero = calculate_non_zero_count(mask1);

  for (int i = non_zero_count_prescan_add_zero - 1; i >= non_zero_count; i--) {

    const int rc = scan[i];

    qcoeff_ptr[rc] = 0;

    dqcoeff_ptr[rc] = 0;

  }

  for (int i = non_zero_count - 1; i >= 0; i--) {

    const int rc = scan[i];

    if (qcoeff_ptr[rc]) {

      eob = i;

      break;

    }

  }

  *eob_ptr = eob + 1;

#if SKIP_EOB_FACTOR_ADJUST

  // TODO(Aniket): Experiment the following loop with intrinsic by combining

  // with the quantization loop above

  for (int i = 0; i < non_zero_count; i++) {

    const int rc = scan[i];

    const int qcoeff = qcoeff_ptr[rc];

    if (qcoeff) {

      first = i;

      break;

    }

  }

  if ((*eob_ptr - 1) >= 0 && first == (*eob_ptr - 1)) {

    const int rc = scan[(*eob_ptr - 1)];

    if (qcoeff_ptr[rc] == 1 || qcoeff_ptr[rc] == -1) {

      const int coeff = coeff_ptr[rc] * wt;

      const int coeff_sign = AOMSIGN(coeff);

      const int abs_coeff = (coeff ^ coeff_sign) - coeff_sign;

      const int factor = EOB_FACTOR + SKIP_EOB_FACTOR_ADJUST;

      const int prescan_add_val =

          ROUND_POWER_OF_TWO(dequant_ptr[rc != 0] * factor, 7);

      if (abs_coeff <

          (zbin_ptr[rc != 0] * (1 << AOM_QM_BITS) + prescan_add_val)) {

        qcoeff_ptr[rc] = 0;

        dqcoeff_ptr[rc] = 0;

        *eob_ptr = 0;

      }

    }

  }

#endif

}

void aom_quantize_b_32x32_adaptive_sse2(

    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) {

  int index = 16;

  const int log_scale = 1;

  int non_zero_count = 0;

  int non_zero_count_prescan_add_zero = 0;

  int is_found0 = 0, is_found1 = 0;

  int eob = -1;

  const __m128i zero = _mm_setzero_si128();

  const __m128i one = _mm_set1_epi16(1);

  const __m128i log_scale_vec = _mm_set1_epi16(log_scale);

  __m128i zbin, round, quant, dequant, shift;

  __m128i coeff0, coeff1, coeff0_sign, coeff1_sign;

  __m128i qcoeff0, qcoeff1;

  __m128i cmp_mask0, cmp_mask1;

  __m128i all_zero;

  __m128i mask0 = zero, mask1 = zero;

  const int zbins[2] = { ROUND_POWER_OF_TWO(zbin_ptr[0], log_scale),

                         ROUND_POWER_OF_TWO(zbin_ptr[1], log_scale) };

  int prescan_add[2];

  int thresh[4];

  const qm_val_t wt = (1 << AOM_QM_BITS);

  for (int i = 0; i < 2; ++i) {

    prescan_add[i] = ROUND_POWER_OF_TWO(dequant_ptr[i] * EOB_FACTOR, 7);

    thresh[i] = (zbins[i] * wt + prescan_add[i]) - 1;

  }

  thresh[2] = thresh[3] = thresh[1];

  __m128i threshold[2];

  threshold[0] = _mm_loadu_si128((__m128i *)&thresh[0]);

  threshold[1] = _mm_unpackhi_epi64(threshold[0], threshold[0]);

#if SKIP_EOB_FACTOR_ADJUST

  int first = -1;

#endif

  // Setup global values.

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

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

  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);

  // Shift with rounding.

  zbin = _mm_add_epi16(zbin, log_scale_vec);

  round = _mm_add_epi16(round, log_scale_vec);

  zbin = _mm_srli_epi16(zbin, log_scale);

  round = _mm_srli_epi16(round, log_scale);

  zbin = _mm_sub_epi16(zbin, one);

  // Do DC and first 15 AC.

  coeff0 = load_coefficients(coeff_ptr);

  coeff1 = load_coefficients(coeff_ptr + 8);

  coeff0_sign = _mm_srai_epi16(coeff0, 15);

  coeff1_sign = _mm_srai_epi16(coeff1, 15);

  qcoeff0 = invert_sign_sse2(coeff0, coeff0_sign);

  qcoeff1 = invert_sign_sse2(coeff1, coeff1_sign);

  update_mask0(&qcoeff0, &qcoeff1, threshold, iscan, &is_found0, &mask0);

  cmp_mask0 = _mm_cmpgt_epi16(qcoeff0, zbin);

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

  cmp_mask1 = _mm_cmpgt_epi16(qcoeff1, zbin);

  update_mask1(&cmp_mask0, &cmp_mask1, iscan, &is_found1, &mask1);

  threshold[0] = threshold[1];

  all_zero = _mm_or_si128(cmp_mask0, cmp_mask1);

  if (_mm_movemask_epi8(all_zero) == 0) {

    _mm_store_si128((__m128i *)(qcoeff_ptr), zero);

    _mm_store_si128((__m128i *)(qcoeff_ptr + 4), zero);

    _mm_store_si128((__m128i *)(qcoeff_ptr + 8), zero);

    _mm_store_si128((__m128i *)(qcoeff_ptr + 12), zero);

    _mm_store_si128((__m128i *)(dqcoeff_ptr), zero);

    _mm_store_si128((__m128i *)(dqcoeff_ptr + 4), zero);

    _mm_store_si128((__m128i *)(dqcoeff_ptr + 8), zero);

    _mm_store_si128((__m128i *)(dqcoeff_ptr + 12), 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 = invert_sign_sse2(qcoeff0, coeff0_sign);

    qcoeff1 = invert_sign_sse2(qcoeff1, coeff1_sign);

    // Mask out zbin threshold coeffs

    qcoeff0 = _mm_and_si128(qcoeff0, cmp_mask0);

    qcoeff1 = _mm_and_si128(qcoeff1, cmp_mask1);

    store_coefficients(qcoeff0, qcoeff_ptr);

    store_coefficients(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);

  }

  // AC only loop.

  while (index < n_coeffs) {

    coeff0 = load_coefficients(coeff_ptr + index);

    coeff1 = load_coefficients(coeff_ptr + index + 8);

    coeff0_sign = _mm_srai_epi16(coeff0, 15);

    coeff1_sign = _mm_srai_epi16(coeff1, 15);

    qcoeff0 = invert_sign_sse2(coeff0, coeff0_sign);

    qcoeff1 = invert_sign_sse2(coeff1, coeff1_sign);

    update_mask0(&qcoeff0, &qcoeff1, threshold, iscan + index, &is_found0,

                 &mask0);

    cmp_mask0 = _mm_cmpgt_epi16(qcoeff0, zbin);

    cmp_mask1 = _mm_cmpgt_epi16(qcoeff1, zbin);

    update_mask1(&cmp_mask0, &cmp_mask1, iscan + index, &is_found1, &mask1);

    all_zero = _mm_or_si128(cmp_mask0, cmp_mask1);

    if (_mm_movemask_epi8(all_zero) == 0) {

      _mm_store_si128((__m128i *)(qcoeff_ptr + index), zero);

      _mm_store_si128((__m128i *)(qcoeff_ptr + index + 4), zero);

      _mm_store_si128((__m128i *)(qcoeff_ptr + index + 8), zero);

      _mm_store_si128((__m128i *)(qcoeff_ptr + index + 12), zero);

      _mm_store_si128((__m128i *)(dqcoeff_ptr + index), zero);

      _mm_store_si128((__m128i *)(dqcoeff_ptr + index + 4), zero);

      _mm_store_si128((__m128i *)(dqcoeff_ptr + index + 8), zero);

      _mm_store_si128((__m128i *)(dqcoeff_ptr + index + 12), zero);

      index += 16;

      continue;

    }

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

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

    qcoeff0 = invert_sign_sse2(qcoeff0, coeff0_sign);

    qcoeff1 = invert_sign_sse2(qcoeff1, coeff1_sign);

    qcoeff0 = _mm_and_si128(qcoeff0, cmp_mask0);

    qcoeff1 = _mm_and_si128(qcoeff1, cmp_mask1);

    store_coefficients(qcoeff0, qcoeff_ptr + index);

    store_coefficients(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);

    index += 16;

  }

  if (is_found0) non_zero_count = calculate_non_zero_count(mask0);

  if (is_found1)

    non_zero_count_prescan_add_zero = calculate_non_zero_count(mask1);

  for (int i = non_zero_count_prescan_add_zero - 1; i >= non_zero_count; i--) {

    const int rc = scan[i];

    qcoeff_ptr[rc] = 0;

    dqcoeff_ptr[rc] = 0;

  }

  for (int i = non_zero_count - 1; i >= 0; i--) {

    const int rc = scan[i];

    if (qcoeff_ptr[rc]) {

      eob = i;

      break;

    }

  }

  *eob_ptr = eob + 1;

#if SKIP_EOB_FACTOR_ADJUST

  // TODO(Aniket): Experiment the following loop with intrinsic by combining

  // with the quantization loop above

  for (int i = 0; i < non_zero_count; i++) {

    const int rc = scan[i];

    const int qcoeff = qcoeff_ptr[rc];

    if (qcoeff) {

      first = i;

      break;

    }

  }

  if ((*eob_ptr - 1) >= 0 && first == (*eob_ptr - 1)) {

    const int rc = scan[(*eob_ptr - 1)];

    if (qcoeff_ptr[rc] == 1 || qcoeff_ptr[rc] == -1) {

      const int coeff = coeff_ptr[rc] * wt;

      const int coeff_sign = AOMSIGN(coeff);

      const int abs_coeff = (coeff ^ coeff_sign) - coeff_sign;

      const int factor = EOB_FACTOR + SKIP_EOB_FACTOR_ADJUST;

      const int prescan_add_val =

          ROUND_POWER_OF_TWO(dequant_ptr[rc != 0] * factor, 7);

      if (abs_coeff < (zbins[rc != 0] * (1 << AOM_QM_BITS) + prescan_add_val)) {

        qcoeff_ptr[rc] = 0;

        dqcoeff_ptr[rc] = 0;

        *eob_ptr = 0;

      }

    }

  }

#endif

}

void aom_quantize_b_64x64_adaptive_sse2(

    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) {

  int index = 16;

  const int log_scale = 2;

  int non_zero_count = 0;

  int non_zero_count_prescan_add_zero = 0;

  int is_found0 = 0, is_found1 = 0;

  int eob = -1;

  const __m128i zero = _mm_setzero_si128();

  const __m128i one = _mm_set1_epi16(1);

  const __m128i log_scale_vec = _mm_set1_epi16(log_scale);

  __m128i zbin, round, quant, dequant, shift;

  __m128i coeff0, coeff1, coeff0_sign, coeff1_sign;

  __m128i qcoeff0, qcoeff1;

  __m128i cmp_mask0, cmp_mask1;

  __m128i all_zero;

  __m128i mask0 = zero, mask1 = zero;

  const int zbins[2] = { ROUND_POWER_OF_TWO(zbin_ptr[0], log_scale),

                         ROUND_POWER_OF_TWO(zbin_ptr[1], log_scale) };

  int prescan_add[2];

  int thresh[4];

  const qm_val_t wt = (1 << AOM_QM_BITS);

  for (int i = 0; i < 2; ++i) {

    prescan_add[i] = ROUND_POWER_OF_TWO(dequant_ptr[i] * EOB_FACTOR, 7);

    thresh[i] = (zbins[i] * wt + prescan_add[i]) - 1;

  }

  thresh[2] = thresh[3] = thresh[1];

  __m128i threshold[2];

  threshold[0] = _mm_loadu_si128((__m128i *)&thresh[0]);

  threshold[1] = _mm_unpackhi_epi64(threshold[0], threshold[0]);

#if SKIP_EOB_FACTOR_ADJUST

  int first = -1;

#endif

  // Setup global values.

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

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

  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);

  // Shift with rounding.

  zbin = _mm_add_epi16(zbin, log_scale_vec);

  round = _mm_add_epi16(round, log_scale_vec);

  zbin = _mm_srli_epi16(zbin, log_scale);

  round = _mm_srli_epi16(round, log_scale);

  zbin = _mm_sub_epi16(zbin, one);

  // Do DC and first 15 AC.

  coeff0 = load_coefficients(coeff_ptr);

  coeff1 = load_coefficients(coeff_ptr + 8);

  coeff0_sign = _mm_srai_epi16(coeff0, 15);

  coeff1_sign = _mm_srai_epi16(coeff1, 15);

  qcoeff0 = invert_sign_sse2(coeff0, coeff0_sign);

  qcoeff1 = invert_sign_sse2(coeff1, coeff1_sign);

  update_mask0(&qcoeff0, &qcoeff1, threshold, iscan, &is_found0, &mask0);

  cmp_mask0 = _mm_cmpgt_epi16(qcoeff0, zbin);

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

  cmp_mask1 = _mm_cmpgt_epi16(qcoeff1, zbin);

  update_mask1(&cmp_mask0, &cmp_mask1, iscan, &is_found1, &mask1);

  threshold[0] = threshold[1];

  all_zero = _mm_or_si128(cmp_mask0, cmp_mask1);

  if (_mm_movemask_epi8(all_zero) == 0) {

    _mm_store_si128((__m128i *)(qcoeff_ptr), zero);

    _mm_store_si128((__m128i *)(qcoeff_ptr + 4), zero);

    _mm_store_si128((__m128i *)(qcoeff_ptr + 8), zero);

    _mm_store_si128((__m128i *)(qcoeff_ptr + 12), zero);

    _mm_store_si128((__m128i *)(dqcoeff_ptr), zero);

    _mm_store_si128((__m128i *)(dqcoeff_ptr + 4), zero);

    _mm_store_si128((__m128i *)(dqcoeff_ptr + 8), zero);

    _mm_store_si128((__m128i *)(dqcoeff_ptr + 12), 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 = invert_sign_sse2(qcoeff0, coeff0_sign);

    qcoeff1 = invert_sign_sse2(qcoeff1, coeff1_sign);

    // Mask out zbin threshold coeffs

    qcoeff0 = _mm_and_si128(qcoeff0, cmp_mask0);

    qcoeff1 = _mm_and_si128(qcoeff1, cmp_mask1);

    store_coefficients(qcoeff0, qcoeff_ptr);

    store_coefficients(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);

  }

  // AC only loop.

  while (index < n_coeffs) {

    coeff0 = load_coefficients(coeff_ptr + index);

    coeff1 = load_coefficients(coeff_ptr + index + 8);

    coeff0_sign = _mm_srai_epi16(coeff0, 15);

    coeff1_sign = _mm_srai_epi16(coeff1, 15);

    qcoeff0 = invert_sign_sse2(coeff0, coeff0_sign);

    qcoeff1 = invert_sign_sse2(coeff1, coeff1_sign);

    update_mask0(&qcoeff0, &qcoeff1, threshold, iscan + index, &is_found0,

                 &mask0);

    cmp_mask0 = _mm_cmpgt_epi16(qcoeff0, zbin);

    cmp_mask1 = _mm_cmpgt_epi16(qcoeff1, zbin);

    update_mask1(&cmp_mask0, &cmp_mask1, iscan + index, &is_found1, &mask1);

    all_zero = _mm_or_si128(cmp_mask0, cmp_mask1);

    if (_mm_movemask_epi8(all_zero) == 0) {

      _mm_store_si128((__m128i *)(qcoeff_ptr + index), zero);

      _mm_store_si128((__m128i *)(qcoeff_ptr + index + 4), zero);

      _mm_store_si128((__m128i *)(qcoeff_ptr + index + 8), zero);

      _mm_store_si128((__m128i *)(qcoeff_ptr + index + 12), zero);

      _mm_store_si128((__m128i *)(dqcoeff_ptr + index), zero);

      _mm_store_si128((__m128i *)(dqcoeff_ptr + index + 4), zero);

      _mm_store_si128((__m128i *)(dqcoeff_ptr + index + 8), zero);

      _mm_store_si128((__m128i *)(dqcoeff_ptr + index + 12), zero);

      index += 16;

      continue;

    }

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

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

    qcoeff0 = invert_sign_sse2(qcoeff0, coeff0_sign);

    qcoeff1 = invert_sign_sse2(qcoeff1, coeff1_sign);

    qcoeff0 = _mm_and_si128(qcoeff0, cmp_mask0);

    qcoeff1 = _mm_and_si128(qcoeff1, cmp_mask1);

    store_coefficients(qcoeff0, qcoeff_ptr + index);

    store_coefficients(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);

    index += 16;

  }

  if (is_found0) non_zero_count = calculate_non_zero_count(mask0);

  if (is_found1)

    non_zero_count_prescan_add_zero = calculate_non_zero_count(mask1);

  for (int i = non_zero_count_prescan_add_zero - 1; i >= non_zero_count; i--) {

    const int rc = scan[i];

    qcoeff_ptr[rc] = 0;

    dqcoeff_ptr[rc] = 0;

  }

  for (int i = non_zero_count - 1; i >= 0; i--) {

    const int rc = scan[i];

    if (qcoeff_ptr[rc]) {

      eob = i;

      break;

    }

  }

  *eob_ptr = eob + 1;

#if SKIP_EOB_FACTOR_ADJUST

  // TODO(Aniket): Experiment the following loop with intrinsic by combining

  // with the quantization loop above

  for (int i = 0; i < non_zero_count; i++) {

    const int rc = scan[i];

    const int qcoeff = qcoeff_ptr[rc];

    if (qcoeff) {

      first = i;

      break;

    }

  }

  if ((*eob_ptr - 1) >= 0 && first == (*eob_ptr - 1)) {

    const int rc = scan[(*eob_ptr - 1)];

    if (qcoeff_ptr[rc] == 1 || qcoeff_ptr[rc] == -1) {

      const int coeff = coeff_ptr[rc] * wt;

      const int coeff_sign = AOMSIGN(coeff);

      const int abs_coeff = (coeff ^ coeff_sign) - coeff_sign;

      const int factor = EOB_FACTOR + SKIP_EOB_FACTOR_ADJUST;

      const int prescan_add_val =

          ROUND_POWER_OF_TWO(dequant_ptr[rc != 0] * factor, 7);

      if (abs_coeff < (zbins[rc != 0] * (1 << AOM_QM_BITS) + prescan_add_val)) {

        qcoeff_ptr[rc] = 0;

        dqcoeff_ptr[rc] = 0;

        *eob_ptr = 0;

      }

    }

  }

#endif

}