diff --git a/aom_dsp/aom_dsp.cmake b/aom_dsp/aom_dsp.cmake
index 6cfbd32..449f30c 100644
--- a/aom_dsp/aom_dsp.cmake
+++ b/aom_dsp/aom_dsp.cmake
@@ -194,6 +194,7 @@
               "${AOM_ROOT}/aom_dsp/x86/highbd_variance_sse2.c"
               "${AOM_ROOT}/aom_dsp/x86/quantize_sse2.c"
               "${AOM_ROOT}/aom_dsp/x86/adaptive_quantize_sse2.c"
+              "${AOM_ROOT}/aom_dsp/x86/highbd_adaptive_quantize_sse2.c"
               "${AOM_ROOT}/aom_dsp/x86/quantize_x86.h"
               "${AOM_ROOT}/aom_dsp/x86/sum_squares_sse2.c"
               "${AOM_ROOT}/aom_dsp/x86/variance_sse2.c")
diff --git a/aom_dsp/aom_dsp_rtcd_defs.pl b/aom_dsp/aom_dsp_rtcd_defs.pl
index 8cffcf3..bddc6e0 100755
--- a/aom_dsp/aom_dsp_rtcd_defs.pl
+++ b/aom_dsp/aom_dsp_rtcd_defs.pl
@@ -546,6 +546,9 @@
 
   add_proto qw/void aom_highbd_quantize_b_64x64/, "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";
   specialize qw/aom_highbd_quantize_b_64x64 sse2/;
+
+  add_proto qw/void aom_highbd_quantize_b_64x64_adaptive/, "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";
+  specialize qw/aom_highbd_quantize_b_64x64_adaptive sse2/;
 }  # CONFIG_AV1_ENCODER
 
 #
diff --git a/aom_dsp/x86/highbd_adaptive_quantize_sse2.c b/aom_dsp/x86/highbd_adaptive_quantize_sse2.c
new file mode 100644
index 0000000..269aa19
--- /dev/null
+++ b/aom_dsp/x86/highbd_adaptive_quantize_sse2.c
@@ -0,0 +1,308 @@
+/*
+ * 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 <emmintrin.h>
+#include "config/aom_dsp_rtcd.h"
+
+#include "aom/aom_integer.h"
+#include "aom_dsp/x86/quantize_x86.h"
+#include "av1/encoder/av1_quantize.h"
+
+static INLINE __m128i highbd_invert_sign_64bit_sse2(__m128i a, __m128i sign) {
+  a = _mm_xor_si128(a, sign);
+  return _mm_sub_epi64(a, sign);
+}
+
+static INLINE void highbd_mul_shift_sse2(const __m128i *x, const __m128i *y,
+                                         __m128i *p, const int shift) {
+  __m128i sign = _mm_srai_epi32(*y, 31);
+  __m128i sign_lo = _mm_unpacklo_epi32(sign, sign);
+  __m128i sign_hi = _mm_unpackhi_epi32(sign, sign);
+  __m128i abs_y = invert_sign_32_sse2(*y, sign);
+  __m128i prod_lo = _mm_mul_epu32(*x, abs_y);
+  __m128i prod_hi = _mm_srli_epi64(*x, 32);
+  const __m128i mult_hi = _mm_srli_epi64(abs_y, 32);
+  prod_hi = _mm_mul_epu32(prod_hi, mult_hi);
+  prod_lo = highbd_invert_sign_64bit_sse2(prod_lo, sign_lo);
+  prod_hi = highbd_invert_sign_64bit_sse2(prod_hi, sign_hi);
+
+  prod_lo = _mm_srli_epi64(prod_lo, shift);
+  const __m128i mask = _mm_set_epi32(0, -1, 0, -1);
+  prod_lo = _mm_and_si128(prod_lo, mask);
+  prod_hi = _mm_srli_epi64(prod_hi, shift);
+
+  prod_hi = _mm_slli_epi64(prod_hi, 32);
+  *p = _mm_or_si128(prod_lo, prod_hi);
+}
+
+static INLINE void highbd_calculate_qcoeff(__m128i *coeff, const __m128i *round,
+                                           const __m128i *quant,
+                                           const __m128i *shift,
+                                           const int *log_scale) {
+  __m128i tmp, qcoeff;
+  qcoeff = _mm_add_epi32(*coeff, *round);
+  highbd_mul_shift_sse2(&qcoeff, quant, &tmp, 16);
+  qcoeff = _mm_add_epi32(tmp, qcoeff);
+  highbd_mul_shift_sse2(&qcoeff, shift, coeff, 16 - *log_scale);
+}
+
+static INLINE void highbd_update_mask1(__m128i *cmp_mask0,
+                                       const int16_t *iscan_ptr, int *is_found,
+                                       __m128i *mask) {
+  __m128i temp_mask = _mm_setzero_si128();
+  if (_mm_movemask_epi8(*cmp_mask0)) {
+    __m128i iscan0 = _mm_load_si128((const __m128i *)(iscan_ptr));
+    __m128i mask0 = _mm_and_si128(*cmp_mask0, iscan0);
+    temp_mask = mask0;
+    *is_found = 1;
+  }
+  *mask = _mm_max_epi16(temp_mask, *mask);
+}
+
+static INLINE void highbd_update_mask0(__m128i *qcoeff0, __m128i *qcoeff1,
+                                       __m128i *threshold,
+                                       const int16_t *iscan_ptr, int *is_found,
+                                       __m128i *mask) {
+  __m128i coeff[2], cmp_mask0, cmp_mask1;
+
+  coeff[0] = _mm_slli_epi32(*qcoeff0, AOM_QM_BITS);
+  cmp_mask0 = _mm_cmpgt_epi32(coeff[0], threshold[0]);
+  coeff[1] = _mm_slli_epi32(*qcoeff1, AOM_QM_BITS);
+  cmp_mask1 = _mm_cmpgt_epi32(coeff[1], threshold[1]);
+
+  cmp_mask0 = _mm_packs_epi32(cmp_mask0, cmp_mask1);
+
+  highbd_update_mask1(&cmp_mask0, iscan_ptr, is_found, mask);
+}
+
+static INLINE __m128i highbd_calculate_dqcoeff(__m128i qcoeff, __m128i dequant,
+                                               const int log_scale) {
+  __m128i coeff_sign = _mm_srai_epi32(qcoeff, 31);
+  __m128i abs_coeff = invert_sign_32_sse2(qcoeff, coeff_sign);
+  highbd_mul_shift_sse2(&abs_coeff, &dequant, &abs_coeff, log_scale);
+  return invert_sign_32_sse2(abs_coeff, coeff_sign);
+}
+
+void aom_highbd_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 = 8;
+  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_epi32(1);
+  const __m128i log_scale_vec = _mm_set1_epi32(log_scale);
+  __m128i zbin, round, quant, dequant, shift;
+  __m128i coeff0, coeff1, coeff0_sign, coeff1_sign;
+  __m128i qcoeff0, qcoeff1;
+  __m128i cmp_mask0, cmp_mask1, cmp_mask;
+  __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);
+
+  __m128i zbin_sign = _mm_srai_epi16(zbin, 15);
+  __m128i round_sign = _mm_srai_epi16(round, 15);
+  __m128i quant_sign = _mm_srai_epi16(quant, 15);
+  __m128i dequant_sign = _mm_srai_epi16(dequant, 15);
+  __m128i shift_sign = _mm_srai_epi16(shift, 15);
+
+  zbin = _mm_unpacklo_epi16(zbin, zbin_sign);
+  round = _mm_unpacklo_epi16(round, round_sign);
+  quant = _mm_unpacklo_epi16(quant, quant_sign);
+  dequant = _mm_unpacklo_epi16(dequant, dequant_sign);
+  shift = _mm_unpacklo_epi16(shift, shift_sign);
+
+  // Shift with rounding.
+  zbin = _mm_add_epi32(zbin, log_scale_vec);
+  round = _mm_add_epi32(round, log_scale_vec);
+  zbin = _mm_srli_epi32(zbin, log_scale);
+  round = _mm_srli_epi32(round, log_scale);
+  zbin = _mm_sub_epi32(zbin, one);
+
+  // Do DC and first 15 AC.
+  coeff0 = _mm_load_si128((__m128i *)(coeff_ptr));
+  coeff1 = _mm_load_si128((__m128i *)(coeff_ptr + 4));
+
+  coeff0_sign = _mm_srai_epi32(coeff0, 31);
+  coeff1_sign = _mm_srai_epi32(coeff1, 31);
+  qcoeff0 = invert_sign_32_sse2(coeff0, coeff0_sign);
+  qcoeff1 = invert_sign_32_sse2(coeff1, coeff1_sign);
+
+  highbd_update_mask0(&qcoeff0, &qcoeff1, threshold, iscan, &is_found0, &mask0);
+
+  cmp_mask0 = _mm_cmpgt_epi32(qcoeff0, zbin);
+  zbin = _mm_unpackhi_epi64(zbin, zbin);  // Switch DC to AC
+  cmp_mask1 = _mm_cmpgt_epi32(qcoeff1, zbin);
+  cmp_mask = _mm_packs_epi32(cmp_mask0, cmp_mask1);
+  highbd_update_mask1(&cmp_mask, 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 *)(dqcoeff_ptr), zero);
+    _mm_store_si128((__m128i *)(dqcoeff_ptr + 4), 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 {
+    highbd_calculate_qcoeff(&qcoeff0, &round, &quant, &shift, &log_scale);
+
+    round = _mm_unpackhi_epi64(round, round);
+    quant = _mm_unpackhi_epi64(quant, quant);
+    shift = _mm_unpackhi_epi64(shift, shift);
+    highbd_calculate_qcoeff(&qcoeff1, &round, &quant, &shift, &log_scale);
+
+    // Reinsert signs
+    qcoeff0 = invert_sign_32_sse2(qcoeff0, coeff0_sign);
+    qcoeff1 = invert_sign_32_sse2(qcoeff1, coeff1_sign);
+
+    // Mask out zbin threshold coeffs
+    qcoeff0 = _mm_and_si128(qcoeff0, cmp_mask0);
+    qcoeff1 = _mm_and_si128(qcoeff1, cmp_mask1);
+
+    _mm_store_si128((__m128i *)(qcoeff_ptr), qcoeff0);
+    _mm_store_si128((__m128i *)(qcoeff_ptr + 4), qcoeff1);
+
+    coeff0 = highbd_calculate_dqcoeff(qcoeff0, dequant, log_scale);
+    dequant = _mm_unpackhi_epi64(dequant, dequant);
+    coeff1 = highbd_calculate_dqcoeff(qcoeff1, dequant, log_scale);
+    _mm_store_si128((__m128i *)(dqcoeff_ptr), coeff0);
+    _mm_store_si128((__m128i *)(dqcoeff_ptr + 4), coeff1);
+  }
+
+  // AC only loop.
+  while (index < n_coeffs) {
+    coeff0 = _mm_load_si128((__m128i *)(coeff_ptr + index));
+    coeff1 = _mm_load_si128((__m128i *)(coeff_ptr + index + 4));
+
+    coeff0_sign = _mm_srai_epi32(coeff0, 31);
+    coeff1_sign = _mm_srai_epi32(coeff1, 31);
+    qcoeff0 = invert_sign_32_sse2(coeff0, coeff0_sign);
+    qcoeff1 = invert_sign_32_sse2(coeff1, coeff1_sign);
+
+    highbd_update_mask0(&qcoeff0, &qcoeff1, threshold, iscan + index,
+                        &is_found0, &mask0);
+
+    cmp_mask0 = _mm_cmpgt_epi32(qcoeff0, zbin);
+    cmp_mask1 = _mm_cmpgt_epi32(qcoeff1, zbin);
+    cmp_mask = _mm_packs_epi32(cmp_mask0, cmp_mask1);
+    highbd_update_mask1(&cmp_mask, 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 *)(dqcoeff_ptr + index), zero);
+      _mm_store_si128((__m128i *)(dqcoeff_ptr + index + 4), zero);
+      index += 8;
+      continue;
+    }
+    highbd_calculate_qcoeff(&qcoeff0, &round, &quant, &shift, &log_scale);
+    highbd_calculate_qcoeff(&qcoeff1, &round, &quant, &shift, &log_scale);
+
+    qcoeff0 = invert_sign_32_sse2(qcoeff0, coeff0_sign);
+    qcoeff1 = invert_sign_32_sse2(qcoeff1, coeff1_sign);
+
+    qcoeff0 = _mm_and_si128(qcoeff0, cmp_mask0);
+    qcoeff1 = _mm_and_si128(qcoeff1, cmp_mask1);
+
+    _mm_store_si128((__m128i *)(qcoeff_ptr + index), qcoeff0);
+    _mm_store_si128((__m128i *)(qcoeff_ptr + index + 4), qcoeff1);
+
+    coeff0 = highbd_calculate_dqcoeff(qcoeff0, dequant, log_scale);
+    coeff1 = highbd_calculate_dqcoeff(qcoeff1, dequant, log_scale);
+
+    _mm_store_si128((__m128i *)(dqcoeff_ptr + index), coeff0);
+    _mm_store_si128((__m128i *)(dqcoeff_ptr + index + 4), coeff1);
+
+    index += 8;
+  }
+  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 = (coeff >> 31);
+      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
+}
diff --git a/av1/encoder/av1_quantize.c b/av1/encoder/av1_quantize.c
index 22c15e6..12ae05c 100644
--- a/av1/encoder/av1_quantize.c
+++ b/av1/encoder/av1_quantize.c
@@ -444,7 +444,7 @@
               eob_ptr, sc->scan, sc->iscan);
           break;
         case 2:
-          aom_highbd_quantize_b_64x64_adaptive_c(
+          aom_highbd_quantize_b_64x64_adaptive(
               coeff_ptr, n_coeffs, p->zbin_QTX, p->round_QTX, p->quant_QTX,
               p->quant_shift_QTX, qcoeff_ptr, dqcoeff_ptr, p->dequant_QTX,
               eob_ptr, sc->scan, sc->iscan);
diff --git a/test/quantize_func_test.cc b/test/quantize_func_test.cc
index b2977f2..d0c660e 100644
--- a/test/quantize_func_test.cc
+++ b/test/quantize_func_test.cc
@@ -431,6 +431,15 @@
              static_cast<TX_SIZE>(TX_64X64), TYPE_B, AOM_BITS_10),
   make_tuple(&aom_highbd_quantize_b_64x64_c, &aom_highbd_quantize_b_64x64_sse2,
              static_cast<TX_SIZE>(TX_64X64), TYPE_B, AOM_BITS_12),
+  make_tuple(&aom_highbd_quantize_b_64x64_adaptive_c,
+             &aom_highbd_quantize_b_64x64_adaptive_sse2,
+             static_cast<TX_SIZE>(TX_64X64), TYPE_B, AOM_BITS_8),
+  make_tuple(&aom_highbd_quantize_b_64x64_adaptive_c,
+             &aom_highbd_quantize_b_64x64_adaptive_sse2,
+             static_cast<TX_SIZE>(TX_64X64), TYPE_B, AOM_BITS_10),
+  make_tuple(&aom_highbd_quantize_b_64x64_adaptive_c,
+             &aom_highbd_quantize_b_64x64_adaptive_sse2,
+             static_cast<TX_SIZE>(TX_64X64), TYPE_B, AOM_BITS_12),
   make_tuple(&aom_quantize_b_adaptive_c, &aom_quantize_b_adaptive_sse2,
              static_cast<TX_SIZE>(TX_16X16), TYPE_B, AOM_BITS_8),
   make_tuple(&aom_quantize_b_adaptive_c, &aom_quantize_b_adaptive_sse2,