1 files changed, 456 insertions, 0 deletions
diff --git a/third_party/aom/aom_dsp/x86/highbd_adaptive_quantize_avx2.c b/third_party/aom/aom_dsp/x86/highbd_adaptive_quantize_avx2.c
new file mode 100644
index 0000000000..05c87bcff9
--- /dev/null
+++ b/third_party/aom/aom_dsp/x86/highbd_adaptive_quantize_avx2.c
@@ -0,0 +1,456 @@
+/*
+ * 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 <immintrin.h>
+
+#include "config/aom_dsp_rtcd.h"
+
+#include "aom/aom_integer.h"
+#include "aom_dsp/quantize.h"
+#include "aom_dsp/x86/quantize_x86.h"
+
+static INLINE void highbd_load_b_values_avx2(
+    const int16_t *zbin_ptr, __m256i *zbin, const int16_t *round_ptr,
+    __m256i *round, const int16_t *quant_ptr, __m256i *quant,
+    const int16_t *dequant_ptr, __m256i *dequant, const int16_t *shift_ptr,
+    __m256i *shift) {
+  *zbin = _mm256_cvtepi16_epi32(_mm_load_si128((const __m128i *)zbin_ptr));
+  *zbin = _mm256_sub_epi32(*zbin, _mm256_set1_epi32(1));
+  *round = _mm256_cvtepi16_epi32(_mm_load_si128((const __m128i *)round_ptr));
+  *quant = _mm256_cvtepi16_epi32(_mm_load_si128((const __m128i *)quant_ptr));
+  *dequant =
+      _mm256_cvtepi16_epi32(_mm_load_si128((const __m128i *)dequant_ptr));
+  *shift = _mm256_cvtepi16_epi32(_mm_load_si128((const __m128i *)shift_ptr));
+}
+
+static INLINE void highbd_update_mask1_avx2(__m256i *cmp_mask,
+                                            const int16_t *iscan_ptr,
+                                            int *is_found, __m256i *mask) {
+  __m256i temp_mask = _mm256_setzero_si256();
+  if (_mm256_movemask_epi8(*cmp_mask)) {
+    __m256i iscan = _mm256_loadu_si256((const __m256i *)(iscan_ptr));
+    temp_mask = _mm256_and_si256(*cmp_mask, iscan);
+    *is_found = 1;
+  }
+  *mask = _mm256_max_epi16(temp_mask, *mask);
+}
+
+static INLINE void highbd_update_mask0_avx2(__m256i *qcoeff0, __m256i *qcoeff1,
+                                            __m256i *threshold,
+                                            const int16_t *iscan_ptr,
+                                            int *is_found, __m256i *mask) {
+  __m256i coeff[2], cmp_mask0, cmp_mask1;
+  coeff[0] = _mm256_slli_epi32(*qcoeff0, AOM_QM_BITS);
+  cmp_mask0 = _mm256_cmpgt_epi32(coeff[0], threshold[0]);
+  coeff[1] = _mm256_slli_epi32(*qcoeff1, AOM_QM_BITS);
+  cmp_mask1 = _mm256_cmpgt_epi32(coeff[1], threshold[1]);
+  cmp_mask0 =
+      _mm256_permute4x64_epi64(_mm256_packs_epi32(cmp_mask0, cmp_mask1), 0xd8);
+  highbd_update_mask1_avx2(&cmp_mask0, iscan_ptr, is_found, mask);
+}
+
+static INLINE void highbd_mul_shift_avx2(const __m256i *x, const __m256i *y,
+                                         __m256i *p, const int shift) {
+  __m256i prod_lo = _mm256_mul_epi32(*x, *y);
+  __m256i prod_hi = _mm256_srli_epi64(*x, 32);
+  const __m256i mult_hi = _mm256_srli_epi64(*y, 32);
+  prod_hi = _mm256_mul_epi32(prod_hi, mult_hi);
+
+  prod_lo = _mm256_srli_epi64(prod_lo, shift);
+  prod_hi = _mm256_srli_epi64(prod_hi, shift);
+
+  prod_hi = _mm256_slli_epi64(prod_hi, 32);
+  *p = _mm256_blend_epi32(prod_lo, prod_hi, 0xaa);
+}
+
+static INLINE void highbd_calculate_qcoeff_avx2(__m256i *coeff,
+                                                const __m256i *round,
+                                                const __m256i *quant,
+                                                const __m256i *shift,
+                                                const int *log_scale) {
+  __m256i tmp, qcoeff;
+  qcoeff = _mm256_add_epi32(*coeff, *round);
+  highbd_mul_shift_avx2(&qcoeff, quant, &tmp, 16);
+  qcoeff = _mm256_add_epi32(tmp, qcoeff);
+  highbd_mul_shift_avx2(&qcoeff, shift, coeff, 16 - *log_scale);
+}
+
+static INLINE __m256i highbd_calculate_dqcoeff_avx2(__m256i qcoeff,
+                                                    __m256i dequant) {
+  return _mm256_mullo_epi32(qcoeff, dequant);
+}
+
+static INLINE __m256i highbd_calculate_dqcoeff_log_scale_avx2(
+    __m256i qcoeff, __m256i dequant, const int log_scale) {
+  __m256i abs_coeff = _mm256_abs_epi32(qcoeff);
+  highbd_mul_shift_avx2(&abs_coeff, &dequant, &abs_coeff, log_scale);
+  return _mm256_sign_epi32(abs_coeff, qcoeff);
+}
+
+static INLINE void highbd_store_coefficients_avx2(__m256i coeff0,
+                                                  __m256i coeff1,
+                                                  tran_low_t *coeff_ptr) {
+  _mm256_store_si256((__m256i *)(coeff_ptr), coeff0);
+  _mm256_store_si256((__m256i *)(coeff_ptr + 8), coeff1);
+}
+
+void aom_highbd_quantize_b_adaptive_avx2(
+    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 __m256i zero = _mm256_setzero_si256();
+  __m256i zbin, round, quant, dequant, shift;
+  __m256i coeff0, qcoeff0, coeff1, qcoeff1;
+  __m256i cmp_mask, mask0 = zero, mask1 = zero;
+  __m128i temp_mask0, temp_mask1;
+  int prescan_add[2];
+  int thresh[2];
+  const int log_scale = 0;
+  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;
+  }
+  __m256i threshold[2];
+  threshold[0] = _mm256_set1_epi32(thresh[0]);
+  threshold[1] = _mm256_set1_epi32(thresh[1]);
+  threshold[0] = _mm256_blend_epi32(threshold[0], threshold[1], 0xfe);
+
+#if SKIP_EOB_FACTOR_ADJUST
+  int first = -1;
+#endif
+
+  // Setup global values.
+  highbd_load_b_values_avx2(zbin_ptr, &zbin, round_ptr, &round, quant_ptr,
+                            &quant, dequant_ptr, &dequant, quant_shift_ptr,
+                            &shift);
+
+  // Do DC and first 15 AC.
+  coeff0 = _mm256_load_si256((__m256i *)(coeff_ptr));
+  qcoeff0 = _mm256_abs_epi32(coeff0);
+  coeff1 = _mm256_load_si256((__m256i *)(coeff_ptr + 8));
+  qcoeff1 = _mm256_abs_epi32(coeff1);
+  highbd_update_mask0_avx2(&qcoeff0, &qcoeff1, threshold, iscan, &is_found0,
+                           &mask0);
+  __m256i temp0 = _mm256_cmpgt_epi32(qcoeff0, zbin);
+  zbin = _mm256_unpackhi_epi64(zbin, zbin);
+  __m256i temp1 = _mm256_cmpgt_epi32(qcoeff1, zbin);
+  cmp_mask = _mm256_permute4x64_epi64(_mm256_packs_epi32(temp0, temp1), 0xd8);
+  highbd_update_mask1_avx2(&cmp_mask, iscan, &is_found1, &mask1);
+  threshold[0] = threshold[1];
+  if (_mm256_movemask_epi8(cmp_mask) == 0) {
+    _mm256_store_si256((__m256i *)(qcoeff_ptr), zero);
+    _mm256_store_si256((__m256i *)(qcoeff_ptr + 8), zero);
+    _mm256_store_si256((__m256i *)(dqcoeff_ptr), zero);
+    _mm256_store_si256((__m256i *)(dqcoeff_ptr + 8), zero);
+    round = _mm256_unpackhi_epi64(round, round);
+    quant = _mm256_unpackhi_epi64(quant, quant);
+    shift = _mm256_unpackhi_epi64(shift, shift);
+    dequant = _mm256_unpackhi_epi64(dequant, dequant);
+  } else {
+    highbd_calculate_qcoeff_avx2(&qcoeff0, &round, &quant, &shift, &log_scale);
+    round = _mm256_unpackhi_epi64(round, round);
+    quant = _mm256_unpackhi_epi64(quant, quant);
+    shift = _mm256_unpackhi_epi64(shift, shift);
+    highbd_calculate_qcoeff_avx2(&qcoeff1, &round, &quant, &shift, &log_scale);
+    // Reinsert signs
+    qcoeff0 = _mm256_sign_epi32(qcoeff0, coeff0);
+    qcoeff1 = _mm256_sign_epi32(qcoeff1, coeff1);
+    // Mask out zbin threshold coeffs
+    qcoeff0 = _mm256_and_si256(qcoeff0, temp0);
+    qcoeff1 = _mm256_and_si256(qcoeff1, temp1);
+    highbd_store_coefficients_avx2(qcoeff0, qcoeff1, qcoeff_ptr);
+    coeff0 = highbd_calculate_dqcoeff_avx2(qcoeff0, dequant);
+    dequant = _mm256_unpackhi_epi64(dequant, dequant);
+    coeff1 = highbd_calculate_dqcoeff_avx2(qcoeff1, dequant);
+    highbd_store_coefficients_avx2(coeff0, coeff1, dqcoeff_ptr);
+  }
+
+  // AC only loop.
+  while (index < n_coeffs) {
+    coeff0 = _mm256_load_si256((__m256i *)(coeff_ptr + index));
+    qcoeff0 = _mm256_abs_epi32(coeff0);
+    coeff1 = _mm256_load_si256((__m256i *)(coeff_ptr + index + 8));
+    qcoeff1 = _mm256_abs_epi32(coeff1);
+    highbd_update_mask0_avx2(&qcoeff0, &qcoeff1, threshold, iscan + index,
+                             &is_found0, &mask0);
+    temp0 = _mm256_cmpgt_epi32(qcoeff0, zbin);
+    temp1 = _mm256_cmpgt_epi32(qcoeff1, zbin);
+    cmp_mask = _mm256_permute4x64_epi64(_mm256_packs_epi32(temp0, temp1), 0xd8);
+    highbd_update_mask1_avx2(&cmp_mask, iscan + index, &is_found1, &mask1);
+    if (_mm256_movemask_epi8(cmp_mask) == 0) {
+      _mm256_store_si256((__m256i *)(qcoeff_ptr + index), zero);
+      _mm256_store_si256((__m256i *)(qcoeff_ptr + index + 8), zero);
+      _mm256_store_si256((__m256i *)(dqcoeff_ptr + index), zero);
+      _mm256_store_si256((__m256i *)(dqcoeff_ptr + index + 8), zero);
+      index += 16;
+      continue;
+    }
+    highbd_calculate_qcoeff_avx2(&qcoeff0, &round, &quant, &shift, &log_scale);
+    highbd_calculate_qcoeff_avx2(&qcoeff1, &round, &quant, &shift, &log_scale);
+    qcoeff0 = _mm256_sign_epi32(qcoeff0, coeff0);
+    qcoeff1 = _mm256_sign_epi32(qcoeff1, coeff1);
+    qcoeff0 = _mm256_and_si256(qcoeff0, temp0);
+    qcoeff1 = _mm256_and_si256(qcoeff1, temp1);
+    highbd_store_coefficients_avx2(qcoeff0, qcoeff1, qcoeff_ptr + index);
+    coeff0 = highbd_calculate_dqcoeff_avx2(qcoeff0, dequant);
+    coeff1 = highbd_calculate_dqcoeff_avx2(qcoeff1, dequant);
+    highbd_store_coefficients_avx2(coeff0, coeff1, dqcoeff_ptr + index);
+    index += 16;
+  }
+  if (is_found0) {
+    temp_mask0 = _mm_max_epi16(_mm256_castsi256_si128(mask0),
+                               _mm256_extracti128_si256(mask0, 1));
+    non_zero_count = calculate_non_zero_count(temp_mask0);
+  }
+  if (is_found1) {
+    temp_mask1 = _mm_max_epi16(_mm256_castsi256_si128(mask1),
+                               _mm256_extracti128_si256(mask1, 1));
+    non_zero_count_prescan_add_zero = calculate_non_zero_count(temp_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_highbd_quantize_b_32x32_adaptive_avx2(
+    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 int log_scale = 1;
+  const __m256i zero = _mm256_setzero_si256();
+  __m256i zbin, round, quant, dequant, shift;
+  __m256i coeff0, qcoeff0, coeff1, qcoeff1;
+  __m256i cmp_mask, mask0 = zero, mask1 = zero;
+  __m128i temp_mask0, temp_mask1;
+  const __m256i one = _mm256_set1_epi32(1);
+  const __m256i log_scale_vec = _mm256_set1_epi32(log_scale);
+  int prescan_add[2];
+  int thresh[2];
+  const int zbins[2] = { ROUND_POWER_OF_TWO(zbin_ptr[0], log_scale),
+                         ROUND_POWER_OF_TWO(zbin_ptr[1], log_scale) };
+  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;
+  }
+  __m256i threshold[2];
+  threshold[0] = _mm256_set1_epi32(thresh[0]);
+  threshold[1] = _mm256_set1_epi32(thresh[1]);
+  threshold[0] = _mm256_blend_epi32(threshold[0], threshold[1], 0xfe);
+
+#if SKIP_EOB_FACTOR_ADJUST
+  int first = -1;
+#endif
+
+  // Setup global values.
+  zbin = _mm256_cvtepi16_epi32(_mm_load_si128((const __m128i *)zbin_ptr));
+  round = _mm256_cvtepi16_epi32(_mm_load_si128((const __m128i *)round_ptr));
+  quant = _mm256_cvtepi16_epi32(_mm_load_si128((const __m128i *)quant_ptr));
+  dequant = _mm256_cvtepi16_epi32(_mm_load_si128((const __m128i *)dequant_ptr));
+  shift =
+      _mm256_cvtepi16_epi32(_mm_load_si128((const __m128i *)quant_shift_ptr));
+
+  // Shift with rounding.
+  zbin = _mm256_add_epi32(zbin, log_scale_vec);
+  round = _mm256_add_epi32(round, log_scale_vec);
+  zbin = _mm256_srli_epi32(zbin, log_scale);
+  round = _mm256_srli_epi32(round, log_scale);
+  zbin = _mm256_sub_epi32(zbin, one);
+
+  // Do DC and first 15 AC.
+  coeff0 = _mm256_load_si256((__m256i *)(coeff_ptr));
+  qcoeff0 = _mm256_abs_epi32(coeff0);
+  coeff1 = _mm256_load_si256((__m256i *)(coeff_ptr + 8));
+  qcoeff1 = _mm256_abs_epi32(coeff1);
+  highbd_update_mask0_avx2(&qcoeff0, &qcoeff1, threshold, iscan, &is_found0,
+                           &mask0);
+  __m256i temp0 = _mm256_cmpgt_epi32(qcoeff0, zbin);
+  zbin = _mm256_permute2x128_si256(zbin, zbin, 0x11);
+  __m256i temp1 = _mm256_cmpgt_epi32(qcoeff1, zbin);
+  cmp_mask = _mm256_permute4x64_epi64(_mm256_packs_epi32(temp0, temp1), 0xd8);
+  highbd_update_mask1_avx2(&cmp_mask, iscan, &is_found1, &mask1);
+  threshold[0] = threshold[1];
+  if (_mm256_movemask_epi8(cmp_mask) == 0) {
+    _mm256_store_si256((__m256i *)(qcoeff_ptr), zero);
+    _mm256_store_si256((__m256i *)(qcoeff_ptr + 8), zero);
+    _mm256_store_si256((__m256i *)(dqcoeff_ptr), zero);
+    _mm256_store_si256((__m256i *)(dqcoeff_ptr + 8), zero);
+    round = _mm256_permute2x128_si256(round, round, 0x11);
+    quant = _mm256_permute2x128_si256(quant, quant, 0x11);
+    shift = _mm256_permute2x128_si256(shift, shift, 0x11);
+    dequant = _mm256_permute2x128_si256(dequant, dequant, 0x11);
+  } else {
+    highbd_calculate_qcoeff_avx2(&qcoeff0, &round, &quant, &shift, &log_scale);
+    round = _mm256_permute2x128_si256(round, round, 0x11);
+    quant = _mm256_permute2x128_si256(quant, quant, 0x11);
+    shift = _mm256_permute2x128_si256(shift, shift, 0x11);
+    highbd_calculate_qcoeff_avx2(&qcoeff1, &round, &quant, &shift, &log_scale);
+    // Reinsert signs
+    qcoeff0 = _mm256_sign_epi32(qcoeff0, coeff0);
+    qcoeff1 = _mm256_sign_epi32(qcoeff1, coeff1);
+    // Mask out zbin threshold coeffs
+    qcoeff0 = _mm256_and_si256(qcoeff0, temp0);
+    qcoeff1 = _mm256_and_si256(qcoeff1, temp1);
+    highbd_store_coefficients_avx2(qcoeff0, qcoeff1, qcoeff_ptr);
+    coeff0 =
+        highbd_calculate_dqcoeff_log_scale_avx2(qcoeff0, dequant, log_scale);
+    dequant = _mm256_permute2x128_si256(dequant, dequant, 0x11);
+    coeff1 =
+        highbd_calculate_dqcoeff_log_scale_avx2(qcoeff1, dequant, log_scale);
+    highbd_store_coefficients_avx2(coeff0, coeff1, dqcoeff_ptr);
+  }
+
+  // AC only loop.
+  while (index < n_coeffs) {
+    coeff0 = _mm256_load_si256((__m256i *)(coeff_ptr + index));
+    qcoeff0 = _mm256_abs_epi32(coeff0);
+    coeff1 = _mm256_load_si256((__m256i *)(coeff_ptr + index + 8));
+    qcoeff1 = _mm256_abs_epi32(coeff1);
+    highbd_update_mask0_avx2(&qcoeff0, &qcoeff1, threshold, iscan + index,
+                             &is_found0, &mask0);
+    temp0 = _mm256_cmpgt_epi32(qcoeff0, zbin);
+    temp1 = _mm256_cmpgt_epi32(qcoeff1, zbin);
+    cmp_mask = _mm256_permute4x64_epi64(_mm256_packs_epi32(temp0, temp1), 0xd8);
+    highbd_update_mask1_avx2(&cmp_mask, iscan + index, &is_found1, &mask1);
+    if (_mm256_movemask_epi8(cmp_mask) == 0) {
+      _mm256_store_si256((__m256i *)(qcoeff_ptr + index), zero);
+      _mm256_store_si256((__m256i *)(qcoeff_ptr + index + 8), zero);
+      _mm256_store_si256((__m256i *)(dqcoeff_ptr + index), zero);
+      _mm256_store_si256((__m256i *)(dqcoeff_ptr + index + 8), zero);
+      index += 16;
+      continue;
+    }
+    highbd_calculate_qcoeff_avx2(&qcoeff0, &round, &quant, &shift, &log_scale);
+    highbd_calculate_qcoeff_avx2(&qcoeff1, &round, &quant, &shift, &log_scale);
+    qcoeff0 = _mm256_sign_epi32(qcoeff0, coeff0);
+    qcoeff1 = _mm256_sign_epi32(qcoeff1, coeff1);
+    qcoeff0 = _mm256_and_si256(qcoeff0, temp0);
+    qcoeff1 = _mm256_and_si256(qcoeff1, temp1);
+    highbd_store_coefficients_avx2(qcoeff0, qcoeff1, qcoeff_ptr + index);
+    coeff0 =
+        highbd_calculate_dqcoeff_log_scale_avx2(qcoeff0, dequant, log_scale);
+    coeff1 =
+        highbd_calculate_dqcoeff_log_scale_avx2(qcoeff1, dequant, log_scale);
+    highbd_store_coefficients_avx2(coeff0, coeff1, dqcoeff_ptr + index);
+    index += 16;
+  }
+  if (is_found0) {
+    temp_mask0 = _mm_max_epi16(_mm256_castsi256_si128(mask0),
+                               _mm256_extracti128_si256(mask0, 1));
+    non_zero_count = calculate_non_zero_count(temp_mask0);
+  }
+  if (is_found1) {
+    temp_mask1 = _mm_max_epi16(_mm256_castsi256_si128(mask1),
+                               _mm256_extracti128_si256(mask1, 1));
+    non_zero_count_prescan_add_zero = calculate_non_zero_count(temp_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
+}