diff --git a/test/dct16x16_test.cc b/test/dct16x16_test.cc
index bd7ddd8..ee417ce 100644
--- a/test/dct16x16_test.cc
+++ b/test/dct16x16_test.cc
@@ -606,29 +606,4 @@
     ::testing::Values(
         make_tuple(&vp9_fdct16x16_c, &vp9_idct16x16_256_add_ssse3, 0)));
 #endif
-
-#if HAVE_AVX2
-// TODO(jzern): these prototypes can be removed after the avx2 versions are
-// reenabled in vp9_rtcd_defs.pl.
-extern "C" {
-void vp9_fdct16x16_avx2(const int16_t *input, int16_t *output, int stride);
-void vp9_fht16x16_avx2(const int16_t *input, int16_t *output, int stride,
-                       int tx_type);
-}
-INSTANTIATE_TEST_CASE_P(
-    DISABLED_AVX2, Trans16x16DCT,
-    ::testing::Values(
-        make_tuple(&vp9_fdct16x16_avx2,
-                   &vp9_idct16x16_256_add_c, 0)));
-INSTANTIATE_TEST_CASE_P(
-    AVX2, Trans16x16HT,
-    ::testing::Values(
-        make_tuple(&vp9_fht16x16_avx2, &vp9_iht16x16_256_add_c, 3)));
-INSTANTIATE_TEST_CASE_P(
-    DISABLED_AVX2, Trans16x16HT,
-    ::testing::Values(
-        make_tuple(&vp9_fht16x16_avx2, &vp9_iht16x16_256_add_c, 0),
-        make_tuple(&vp9_fht16x16_avx2, &vp9_iht16x16_256_add_c, 1),
-        make_tuple(&vp9_fht16x16_avx2, &vp9_iht16x16_256_add_c, 2)));
-#endif
 }  // namespace
diff --git a/test/fdct4x4_test.cc b/test/fdct4x4_test.cc
index bea19f1..7c48260 100644
--- a/test/fdct4x4_test.cc
+++ b/test/fdct4x4_test.cc
@@ -376,19 +376,4 @@
         make_tuple(&vp9_fht4x4_sse2, &vp9_iht4x4_16_add_sse2, 3)));
 #endif
 
-#if HAVE_AVX2
-INSTANTIATE_TEST_CASE_P(
-    AVX2, Trans4x4DCT,
-    ::testing::Values(
-        make_tuple(&vp9_fdct4x4_avx2,
-                   &vp9_idct4x4_16_add_c, 0)));
-INSTANTIATE_TEST_CASE_P(
-    AVX2, Trans4x4HT,
-    ::testing::Values(
-        make_tuple(&vp9_fht4x4_avx2, &vp9_iht4x4_16_add_c, 0),
-        make_tuple(&vp9_fht4x4_avx2, &vp9_iht4x4_16_add_c, 1),
-        make_tuple(&vp9_fht4x4_avx2, &vp9_iht4x4_16_add_c, 2),
-        make_tuple(&vp9_fht4x4_avx2, &vp9_iht4x4_16_add_c, 3)));
-#endif
-
 }  // namespace
diff --git a/test/fdct8x8_test.cc b/test/fdct8x8_test.cc
index 2590837..6a5d6bb 100644
--- a/test/fdct8x8_test.cc
+++ b/test/fdct8x8_test.cc
@@ -367,18 +367,4 @@
     ::testing::Values(
         make_tuple(&vp9_fdct8x8_ssse3, &vp9_idct8x8_64_add_ssse3, 0)));
 #endif
-
-#if HAVE_AVX2
-INSTANTIATE_TEST_CASE_P(
-    AVX2, FwdTrans8x8DCT,
-    ::testing::Values(
-        make_tuple(&vp9_fdct8x8_avx2, &vp9_idct8x8_64_add_c, 0)));
-INSTANTIATE_TEST_CASE_P(
-    AVX2, FwdTrans8x8HT,
-    ::testing::Values(
-        make_tuple(&vp9_fht8x8_avx2, &vp9_iht8x8_64_add_c, 0),
-        make_tuple(&vp9_fht8x8_avx2, &vp9_iht8x8_64_add_c, 1),
-        make_tuple(&vp9_fht8x8_avx2, &vp9_iht8x8_64_add_c, 2),
-        make_tuple(&vp9_fht8x8_avx2, &vp9_iht8x8_64_add_c, 3)));
-#endif
 }  // namespace
diff --git a/vp9/common/vp9_rtcd_defs.pl b/vp9/common/vp9_rtcd_defs.pl
index ef5caf3..666afa4 100644
--- a/vp9/common/vp9_rtcd_defs.pl
+++ b/vp9/common/vp9_rtcd_defs.pl
@@ -739,10 +739,10 @@
 
 # fdct functions
 add_proto qw/void vp9_fht4x4/, "const int16_t *input, int16_t *output, int stride, int tx_type";
-specialize qw/vp9_fht4x4 sse2 avx2/;
+specialize qw/vp9_fht4x4 sse2/;
 
 add_proto qw/void vp9_fht8x8/, "const int16_t *input, int16_t *output, int stride, int tx_type";
-specialize qw/vp9_fht8x8 sse2 avx2/;
+specialize qw/vp9_fht8x8 sse2/;
 
 add_proto qw/void vp9_fht16x16/, "const int16_t *input, int16_t *output, int stride, int tx_type";
 specialize qw/vp9_fht16x16 sse2/;
@@ -754,13 +754,13 @@
 specialize qw/vp9_fdct4x4_1 sse2/;
 
 add_proto qw/void vp9_fdct4x4/, "const int16_t *input, int16_t *output, int stride";
-specialize qw/vp9_fdct4x4 sse2 avx2/;
+specialize qw/vp9_fdct4x4 sse2/;
 
 add_proto qw/void vp9_fdct8x8_1/, "const int16_t *input, int16_t *output, int stride";
 specialize qw/vp9_fdct8x8_1 sse2/;
 
 add_proto qw/void vp9_fdct8x8/, "const int16_t *input, int16_t *output, int stride";
-specialize qw/vp9_fdct8x8 sse2 avx2/, "$ssse3_x86_64";
+specialize qw/vp9_fdct8x8 sse2/, "$ssse3_x86_64";
 
 add_proto qw/void vp9_fdct16x16_1/, "const int16_t *input, int16_t *output, int stride";
 specialize qw/vp9_fdct16x16_1 sse2/;
diff --git a/vp9/encoder/x86/vp9_dct_avx2.c b/vp9/encoder/x86/vp9_dct_avx2.c
index b5269ed..3a19f527 100644
--- a/vp9/encoder/x86/vp9_dct_avx2.c
+++ b/vp9/encoder/x86/vp9_dct_avx2.c
@@ -12,2572 +12,6 @@
 #include "vp9/common/vp9_idct.h"  // for cospi constants
 #include "vpx_ports/mem.h"
 
-void vp9_fdct4x4_avx2(const int16_t *input, int16_t *output, int stride) {
-  // The 2D transform is done with two passes which are actually pretty
-  // similar. In the first one, we transform the columns and transpose
-  // the results. In the second one, we transform the rows. To achieve that,
-  // as the first pass results are transposed, we transpose the columns (that
-  // is the transposed rows) and transpose the results (so that it goes back
-  // in normal/row positions).
-  int pass;
-  // Constants
-  //    When we use them, in one case, they are all the same. In all others
-  //    it's a pair of them that we need to repeat four times. This is done
-  //    by constructing the 32 bit constant corresponding to that pair.
-  const __m128i k__cospi_p16_p16 = _mm_set1_epi16(cospi_16_64);
-  const __m128i k__cospi_p16_m16 = pair_set_epi16(cospi_16_64, -cospi_16_64);
-  const __m128i k__cospi_p24_p08 = pair_set_epi16(cospi_24_64, cospi_8_64);
-  const __m128i k__cospi_m08_p24 = pair_set_epi16(-cospi_8_64, cospi_24_64);
-  const __m128i k__DCT_CONST_ROUNDING = _mm_set1_epi32(DCT_CONST_ROUNDING);
-  const __m128i k__nonzero_bias_a = _mm_setr_epi16(0, 1, 1, 1, 1, 1, 1, 1);
-  const __m128i k__nonzero_bias_b = _mm_setr_epi16(1, 0, 0, 0, 0, 0, 0, 0);
-  const __m128i kOne = _mm_set1_epi16(1);
-  __m128i in0, in1, in2, in3;
-  // Load inputs.
-  {
-    in0  = _mm_loadl_epi64((const __m128i *)(input +  0 * stride));
-    in1  = _mm_loadl_epi64((const __m128i *)(input +  1 * stride));
-    in2  = _mm_loadl_epi64((const __m128i *)(input +  2 * stride));
-    in3  = _mm_loadl_epi64((const __m128i *)(input +  3 * stride));
-    // x = x << 4
-    in0 = _mm_slli_epi16(in0, 4);
-    in1 = _mm_slli_epi16(in1, 4);
-    in2 = _mm_slli_epi16(in2, 4);
-    in3 = _mm_slli_epi16(in3, 4);
-    // if (i == 0 && input[0]) input[0] += 1;
-    {
-      // The mask will only contain whether the first value is zero, all
-      // other comparison will fail as something shifted by 4 (above << 4)
-      // can never be equal to one. To increment in the non-zero case, we
-      // add the mask and one for the first element:
-      //   - if zero, mask = -1, v = v - 1 + 1 = v
-      //   - if non-zero, mask = 0, v = v + 0 + 1 = v + 1
-      __m128i mask = _mm_cmpeq_epi16(in0, k__nonzero_bias_a);
-      in0 = _mm_add_epi16(in0, mask);
-      in0 = _mm_add_epi16(in0, k__nonzero_bias_b);
-    }
-  }
-  // Do the two transform/transpose passes
-  for (pass = 0; pass < 2; ++pass) {
-    // Transform 1/2: Add/subtract
-    const __m128i r0 = _mm_add_epi16(in0, in3);
-    const __m128i r1 = _mm_add_epi16(in1, in2);
-    const __m128i r2 = _mm_sub_epi16(in1, in2);
-    const __m128i r3 = _mm_sub_epi16(in0, in3);
-    // Transform 1/2: Interleave to do the multiply by constants which gets us
-    //                into 32 bits.
-    const __m128i t0 = _mm_unpacklo_epi16(r0, r1);
-    const __m128i t2 = _mm_unpacklo_epi16(r2, r3);
-    const __m128i u0 = _mm_madd_epi16(t0, k__cospi_p16_p16);
-    const __m128i u2 = _mm_madd_epi16(t0, k__cospi_p16_m16);
-    const __m128i u4 = _mm_madd_epi16(t2, k__cospi_p24_p08);
-    const __m128i u6 = _mm_madd_epi16(t2, k__cospi_m08_p24);
-    const __m128i v0 = _mm_add_epi32(u0, k__DCT_CONST_ROUNDING);
-    const __m128i v2 = _mm_add_epi32(u2, k__DCT_CONST_ROUNDING);
-    const __m128i v4 = _mm_add_epi32(u4, k__DCT_CONST_ROUNDING);
-    const __m128i v6 = _mm_add_epi32(u6, k__DCT_CONST_ROUNDING);
-    const __m128i w0 = _mm_srai_epi32(v0, DCT_CONST_BITS);
-    const __m128i w2 = _mm_srai_epi32(v2, DCT_CONST_BITS);
-    const __m128i w4 = _mm_srai_epi32(v4, DCT_CONST_BITS);
-    const __m128i w6 = _mm_srai_epi32(v6, DCT_CONST_BITS);
-    // Combine and transpose
-    const __m128i res0 = _mm_packs_epi32(w0, w2);
-    const __m128i res1 = _mm_packs_epi32(w4, w6);
-    // 00 01 02 03 20 21 22 23
-    // 10 11 12 13 30 31 32 33
-    const __m128i tr0_0 = _mm_unpacklo_epi16(res0, res1);
-    const __m128i tr0_1 = _mm_unpackhi_epi16(res0, res1);
-    // 00 10 01 11 02 12 03 13
-    // 20 30 21 31 22 32 23 33
-    in0 = _mm_unpacklo_epi32(tr0_0, tr0_1);
-    in2 = _mm_unpackhi_epi32(tr0_0, tr0_1);
-    // 00 10 20 30 01 11 21 31      in0 contains 0 followed by 1
-    // 02 12 22 32 03 13 23 33      in2 contains 2 followed by 3
-    if (0 == pass) {
-      // Extract values in the high part for second pass as transform code
-      // only uses the first four values.
-      in1 = _mm_unpackhi_epi64(in0, in0);
-      in3 = _mm_unpackhi_epi64(in2, in2);
-    } else {
-      // Post-condition output and store it (v + 1) >> 2, taking advantage
-      // of the fact 1/3 are stored just after 0/2.
-      __m128i out01 = _mm_add_epi16(in0, kOne);
-      __m128i out23 = _mm_add_epi16(in2, kOne);
-      out01 = _mm_srai_epi16(out01, 2);
-      out23 = _mm_srai_epi16(out23, 2);
-      _mm_storeu_si128((__m128i *)(output + 0 * 4), out01);
-      _mm_storeu_si128((__m128i *)(output + 2 * 4), out23);
-    }
-  }
-}
-
-static INLINE void load_buffer_4x4_avx2(const int16_t *input, __m128i *in,
-                                   int stride) {
-  const __m128i k__nonzero_bias_a = _mm_setr_epi16(0, 1, 1, 1, 1, 1, 1, 1);
-  const __m128i k__nonzero_bias_b = _mm_setr_epi16(1, 0, 0, 0, 0, 0, 0, 0);
-  __m128i mask;
-
-  in[0] = _mm_loadl_epi64((const __m128i *)(input + 0 * stride));
-  in[1] = _mm_loadl_epi64((const __m128i *)(input + 1 * stride));
-  in[2] = _mm_loadl_epi64((const __m128i *)(input + 2 * stride));
-  in[3] = _mm_loadl_epi64((const __m128i *)(input + 3 * stride));
-
-  in[0] = _mm_slli_epi16(in[0], 4);
-  in[1] = _mm_slli_epi16(in[1], 4);
-  in[2] = _mm_slli_epi16(in[2], 4);
-  in[3] = _mm_slli_epi16(in[3], 4);
-
-  mask = _mm_cmpeq_epi16(in[0], k__nonzero_bias_a);
-  in[0] = _mm_add_epi16(in[0], mask);
-  in[0] = _mm_add_epi16(in[0], k__nonzero_bias_b);
-}
-
-static INLINE void write_buffer_4x4_avx2(int16_t *output, __m128i *res) {
-  const __m128i kOne = _mm_set1_epi16(1);
-  __m128i in01 = _mm_unpacklo_epi64(res[0], res[1]);
-  __m128i in23 = _mm_unpacklo_epi64(res[2], res[3]);
-  __m128i out01 = _mm_add_epi16(in01, kOne);
-  __m128i out23 = _mm_add_epi16(in23, kOne);
-  out01 = _mm_srai_epi16(out01, 2);
-  out23 = _mm_srai_epi16(out23, 2);
-  _mm_store_si128((__m128i *)(output + 0 * 8), out01);
-  _mm_store_si128((__m128i *)(output + 1 * 8), out23);
-}
-
-static INLINE void transpose_4x4_avx2(__m128i *res) {
-  // Combine and transpose
-  // 00 01 02 03 20 21 22 23
-  // 10 11 12 13 30 31 32 33
-  const __m128i tr0_0 = _mm_unpacklo_epi16(res[0], res[1]);
-  const __m128i tr0_1 = _mm_unpackhi_epi16(res[0], res[1]);
-
-  // 00 10 01 11 02 12 03 13
-  // 20 30 21 31 22 32 23 33
-  res[0] = _mm_unpacklo_epi32(tr0_0, tr0_1);
-  res[2] = _mm_unpackhi_epi32(tr0_0, tr0_1);
-
-  // 00 10 20 30 01 11 21 31
-  // 02 12 22 32 03 13 23 33
-  // only use the first 4 16-bit integers
-  res[1] = _mm_unpackhi_epi64(res[0], res[0]);
-  res[3] = _mm_unpackhi_epi64(res[2], res[2]);
-}
-
-void fdct4_avx2(__m128i *in) {
-  const __m128i k__cospi_p16_p16 = _mm_set1_epi16(cospi_16_64);
-  const __m128i k__cospi_p16_m16 = pair_set_epi16(cospi_16_64, -cospi_16_64);
-  const __m128i k__cospi_p08_p24 = pair_set_epi16(cospi_8_64, cospi_24_64);
-  const __m128i k__cospi_p24_m08 = pair_set_epi16(cospi_24_64, -cospi_8_64);
-  const __m128i k__DCT_CONST_ROUNDING = _mm_set1_epi32(DCT_CONST_ROUNDING);
-
-  __m128i u[4], v[4];
-  u[0]=_mm_unpacklo_epi16(in[0], in[1]);
-  u[1]=_mm_unpacklo_epi16(in[3], in[2]);
-
-  v[0] = _mm_add_epi16(u[0], u[1]);
-  v[1] = _mm_sub_epi16(u[0], u[1]);
-
-  u[0] = _mm_madd_epi16(v[0], k__cospi_p16_p16);  // 0
-  u[1] = _mm_madd_epi16(v[0], k__cospi_p16_m16);  // 2
-  u[2] = _mm_madd_epi16(v[1], k__cospi_p08_p24);  // 1
-  u[3] = _mm_madd_epi16(v[1], k__cospi_p24_m08);  // 3
-
-  v[0] = _mm_add_epi32(u[0], k__DCT_CONST_ROUNDING);
-  v[1] = _mm_add_epi32(u[1], k__DCT_CONST_ROUNDING);
-  v[2] = _mm_add_epi32(u[2], k__DCT_CONST_ROUNDING);
-  v[3] = _mm_add_epi32(u[3], k__DCT_CONST_ROUNDING);
-  u[0] = _mm_srai_epi32(v[0], DCT_CONST_BITS);
-  u[1] = _mm_srai_epi32(v[1], DCT_CONST_BITS);
-  u[2] = _mm_srai_epi32(v[2], DCT_CONST_BITS);
-  u[3] = _mm_srai_epi32(v[3], DCT_CONST_BITS);
-
-  in[0] = _mm_packs_epi32(u[0], u[1]);
-  in[1] = _mm_packs_epi32(u[2], u[3]);
-  transpose_4x4_avx2(in);
-}
-
-void fadst4_avx2(__m128i *in) {
-  const __m128i k__sinpi_p01_p02 = pair_set_epi16(sinpi_1_9, sinpi_2_9);
-  const __m128i k__sinpi_p04_m01 = pair_set_epi16(sinpi_4_9, -sinpi_1_9);
-  const __m128i k__sinpi_p03_p04 = pair_set_epi16(sinpi_3_9, sinpi_4_9);
-  const __m128i k__sinpi_m03_p02 = pair_set_epi16(-sinpi_3_9, sinpi_2_9);
-  const __m128i k__sinpi_p03_p03 = _mm_set1_epi16(sinpi_3_9);
-  const __m128i kZero = _mm_set1_epi16(0);
-  const __m128i k__DCT_CONST_ROUNDING = _mm_set1_epi32(DCT_CONST_ROUNDING);
-  __m128i u[8], v[8];
-  __m128i in7 = _mm_add_epi16(in[0], in[1]);
-
-  u[0] = _mm_unpacklo_epi16(in[0], in[1]);
-  u[1] = _mm_unpacklo_epi16(in[2], in[3]);
-  u[2] = _mm_unpacklo_epi16(in7, kZero);
-  u[3] = _mm_unpacklo_epi16(in[2], kZero);
-  u[4] = _mm_unpacklo_epi16(in[3], kZero);
-
-  v[0] = _mm_madd_epi16(u[0], k__sinpi_p01_p02);  // s0 + s2
-  v[1] = _mm_madd_epi16(u[1], k__sinpi_p03_p04);  // s4 + s5
-  v[2] = _mm_madd_epi16(u[2], k__sinpi_p03_p03);  // x1
-  v[3] = _mm_madd_epi16(u[0], k__sinpi_p04_m01);  // s1 - s3
-  v[4] = _mm_madd_epi16(u[1], k__sinpi_m03_p02);  // -s4 + s6
-  v[5] = _mm_madd_epi16(u[3], k__sinpi_p03_p03);  // s4
-  v[6] = _mm_madd_epi16(u[4], k__sinpi_p03_p03);
-
-  u[0] = _mm_add_epi32(v[0], v[1]);
-  u[1] = _mm_sub_epi32(v[2], v[6]);
-  u[2] = _mm_add_epi32(v[3], v[4]);
-  u[3] = _mm_sub_epi32(u[2], u[0]);
-  u[4] = _mm_slli_epi32(v[5], 2);
-  u[5] = _mm_sub_epi32(u[4], v[5]);
-  u[6] = _mm_add_epi32(u[3], u[5]);
-
-  v[0] = _mm_add_epi32(u[0], k__DCT_CONST_ROUNDING);
-  v[1] = _mm_add_epi32(u[1], k__DCT_CONST_ROUNDING);
-  v[2] = _mm_add_epi32(u[2], k__DCT_CONST_ROUNDING);
-  v[3] = _mm_add_epi32(u[6], k__DCT_CONST_ROUNDING);
-
-  u[0] = _mm_srai_epi32(v[0], DCT_CONST_BITS);
-  u[1] = _mm_srai_epi32(v[1], DCT_CONST_BITS);
-  u[2] = _mm_srai_epi32(v[2], DCT_CONST_BITS);
-  u[3] = _mm_srai_epi32(v[3], DCT_CONST_BITS);
-
-  in[0] = _mm_packs_epi32(u[0], u[2]);
-  in[1] = _mm_packs_epi32(u[1], u[3]);
-  transpose_4x4_avx2(in);
-}
-
-void vp9_fht4x4_avx2(const int16_t *input, int16_t *output,
-                     int stride, int tx_type) {
-  __m128i in[4];
-
-  switch (tx_type) {
-    case DCT_DCT:
-      vp9_fdct4x4_avx2(input, output, stride);
-      break;
-    case ADST_DCT:
-      load_buffer_4x4_avx2(input, in, stride);
-      fadst4_avx2(in);
-      fdct4_avx2(in);
-      write_buffer_4x4_avx2(output, in);
-      break;
-    case DCT_ADST:
-      load_buffer_4x4_avx2(input, in, stride);
-      fdct4_avx2(in);
-      fadst4_avx2(in);
-      write_buffer_4x4_avx2(output, in);
-      break;
-    case ADST_ADST:
-      load_buffer_4x4_avx2(input, in, stride);
-      fadst4_avx2(in);
-      fadst4_avx2(in);
-      write_buffer_4x4_avx2(output, in);
-      break;
-    default:
-      assert(0);
-      break;
-  }
-}
-
-void vp9_fdct8x8_avx2(const int16_t *input, int16_t *output, int stride) {
-  int pass;
-  // Constants
-  //    When we use them, in one case, they are all the same. In all others
-  //    it's a pair of them that we need to repeat four times. This is done
-  //    by constructing the 32 bit constant corresponding to that pair.
-  const __m128i k__cospi_p16_p16 = _mm_set1_epi16(cospi_16_64);
-  const __m128i k__cospi_p16_m16 = pair_set_epi16(cospi_16_64, -cospi_16_64);
-  const __m128i k__cospi_p24_p08 = pair_set_epi16(cospi_24_64, cospi_8_64);
-  const __m128i k__cospi_m08_p24 = pair_set_epi16(-cospi_8_64, cospi_24_64);
-  const __m128i k__cospi_p28_p04 = pair_set_epi16(cospi_28_64, cospi_4_64);
-  const __m128i k__cospi_m04_p28 = pair_set_epi16(-cospi_4_64, cospi_28_64);
-  const __m128i k__cospi_p12_p20 = pair_set_epi16(cospi_12_64, cospi_20_64);
-  const __m128i k__cospi_m20_p12 = pair_set_epi16(-cospi_20_64, cospi_12_64);
-  const __m128i k__DCT_CONST_ROUNDING = _mm_set1_epi32(DCT_CONST_ROUNDING);
-  // Load input
-  __m128i in0  = _mm_load_si128((const __m128i *)(input + 0 * stride));
-  __m128i in1  = _mm_load_si128((const __m128i *)(input + 1 * stride));
-  __m128i in2  = _mm_load_si128((const __m128i *)(input + 2 * stride));
-  __m128i in3  = _mm_load_si128((const __m128i *)(input + 3 * stride));
-  __m128i in4  = _mm_load_si128((const __m128i *)(input + 4 * stride));
-  __m128i in5  = _mm_load_si128((const __m128i *)(input + 5 * stride));
-  __m128i in6  = _mm_load_si128((const __m128i *)(input + 6 * stride));
-  __m128i in7  = _mm_load_si128((const __m128i *)(input + 7 * stride));
-  // Pre-condition input (shift by two)
-  in0 = _mm_slli_epi16(in0, 2);
-  in1 = _mm_slli_epi16(in1, 2);
-  in2 = _mm_slli_epi16(in2, 2);
-  in3 = _mm_slli_epi16(in3, 2);
-  in4 = _mm_slli_epi16(in4, 2);
-  in5 = _mm_slli_epi16(in5, 2);
-  in6 = _mm_slli_epi16(in6, 2);
-  in7 = _mm_slli_epi16(in7, 2);
-
-  // We do two passes, first the columns, then the rows. The results of the
-  // first pass are transposed so that the same column code can be reused. The
-  // results of the second pass are also transposed so that the rows (processed
-  // as columns) are put back in row positions.
-  for (pass = 0; pass < 2; pass++) {
-    // To store results of each pass before the transpose.
-    __m128i res0, res1, res2, res3, res4, res5, res6, res7;
-    // Add/subtract
-    const __m128i q0 = _mm_add_epi16(in0, in7);
-    const __m128i q1 = _mm_add_epi16(in1, in6);
-    const __m128i q2 = _mm_add_epi16(in2, in5);
-    const __m128i q3 = _mm_add_epi16(in3, in4);
-    const __m128i q4 = _mm_sub_epi16(in3, in4);
-    const __m128i q5 = _mm_sub_epi16(in2, in5);
-    const __m128i q6 = _mm_sub_epi16(in1, in6);
-    const __m128i q7 = _mm_sub_epi16(in0, in7);
-    // Work on first four results
-    {
-      // Add/subtract
-      const __m128i r0 = _mm_add_epi16(q0, q3);
-      const __m128i r1 = _mm_add_epi16(q1, q2);
-      const __m128i r2 = _mm_sub_epi16(q1, q2);
-      const __m128i r3 = _mm_sub_epi16(q0, q3);
-      // Interleave to do the multiply by constants which gets us into 32bits
-      const __m128i t0 = _mm_unpacklo_epi16(r0, r1);
-      const __m128i t1 = _mm_unpackhi_epi16(r0, r1);
-      const __m128i t2 = _mm_unpacklo_epi16(r2, r3);
-      const __m128i t3 = _mm_unpackhi_epi16(r2, r3);
-      const __m128i u0 = _mm_madd_epi16(t0, k__cospi_p16_p16);
-      const __m128i u1 = _mm_madd_epi16(t1, k__cospi_p16_p16);
-      const __m128i u2 = _mm_madd_epi16(t0, k__cospi_p16_m16);
-      const __m128i u3 = _mm_madd_epi16(t1, k__cospi_p16_m16);
-      const __m128i u4 = _mm_madd_epi16(t2, k__cospi_p24_p08);
-      const __m128i u5 = _mm_madd_epi16(t3, k__cospi_p24_p08);
-      const __m128i u6 = _mm_madd_epi16(t2, k__cospi_m08_p24);
-      const __m128i u7 = _mm_madd_epi16(t3, k__cospi_m08_p24);
-      // dct_const_round_shift
-      const __m128i v0 = _mm_add_epi32(u0, k__DCT_CONST_ROUNDING);
-      const __m128i v1 = _mm_add_epi32(u1, k__DCT_CONST_ROUNDING);
-      const __m128i v2 = _mm_add_epi32(u2, k__DCT_CONST_ROUNDING);
-      const __m128i v3 = _mm_add_epi32(u3, k__DCT_CONST_ROUNDING);
-      const __m128i v4 = _mm_add_epi32(u4, k__DCT_CONST_ROUNDING);
-      const __m128i v5 = _mm_add_epi32(u5, k__DCT_CONST_ROUNDING);
-      const __m128i v6 = _mm_add_epi32(u6, k__DCT_CONST_ROUNDING);
-      const __m128i v7 = _mm_add_epi32(u7, k__DCT_CONST_ROUNDING);
-      const __m128i w0 = _mm_srai_epi32(v0, DCT_CONST_BITS);
-      const __m128i w1 = _mm_srai_epi32(v1, DCT_CONST_BITS);
-      const __m128i w2 = _mm_srai_epi32(v2, DCT_CONST_BITS);
-      const __m128i w3 = _mm_srai_epi32(v3, DCT_CONST_BITS);
-      const __m128i w4 = _mm_srai_epi32(v4, DCT_CONST_BITS);
-      const __m128i w5 = _mm_srai_epi32(v5, DCT_CONST_BITS);
-      const __m128i w6 = _mm_srai_epi32(v6, DCT_CONST_BITS);
-      const __m128i w7 = _mm_srai_epi32(v7, DCT_CONST_BITS);
-      // Combine
-      res0 = _mm_packs_epi32(w0, w1);
-      res4 = _mm_packs_epi32(w2, w3);
-      res2 = _mm_packs_epi32(w4, w5);
-      res6 = _mm_packs_epi32(w6, w7);
-    }
-    // Work on next four results
-    {
-      // Interleave to do the multiply by constants which gets us into 32bits
-      const __m128i d0 = _mm_unpacklo_epi16(q6, q5);
-      const __m128i d1 = _mm_unpackhi_epi16(q6, q5);
-      const __m128i e0 = _mm_madd_epi16(d0, k__cospi_p16_m16);
-      const __m128i e1 = _mm_madd_epi16(d1, k__cospi_p16_m16);
-      const __m128i e2 = _mm_madd_epi16(d0, k__cospi_p16_p16);
-      const __m128i e3 = _mm_madd_epi16(d1, k__cospi_p16_p16);
-      // dct_const_round_shift
-      const __m128i f0 = _mm_add_epi32(e0, k__DCT_CONST_ROUNDING);
-      const __m128i f1 = _mm_add_epi32(e1, k__DCT_CONST_ROUNDING);
-      const __m128i f2 = _mm_add_epi32(e2, k__DCT_CONST_ROUNDING);
-      const __m128i f3 = _mm_add_epi32(e3, k__DCT_CONST_ROUNDING);
-      const __m128i s0 = _mm_srai_epi32(f0, DCT_CONST_BITS);
-      const __m128i s1 = _mm_srai_epi32(f1, DCT_CONST_BITS);
-      const __m128i s2 = _mm_srai_epi32(f2, DCT_CONST_BITS);
-      const __m128i s3 = _mm_srai_epi32(f3, DCT_CONST_BITS);
-      // Combine
-      const __m128i r0 = _mm_packs_epi32(s0, s1);
-      const __m128i r1 = _mm_packs_epi32(s2, s3);
-      // Add/subtract
-      const __m128i x0 = _mm_add_epi16(q4, r0);
-      const __m128i x1 = _mm_sub_epi16(q4, r0);
-      const __m128i x2 = _mm_sub_epi16(q7, r1);
-      const __m128i x3 = _mm_add_epi16(q7, r1);
-      // Interleave to do the multiply by constants which gets us into 32bits
-      const __m128i t0 = _mm_unpacklo_epi16(x0, x3);
-      const __m128i t1 = _mm_unpackhi_epi16(x0, x3);
-      const __m128i t2 = _mm_unpacklo_epi16(x1, x2);
-      const __m128i t3 = _mm_unpackhi_epi16(x1, x2);
-      const __m128i u0 = _mm_madd_epi16(t0, k__cospi_p28_p04);
-      const __m128i u1 = _mm_madd_epi16(t1, k__cospi_p28_p04);
-      const __m128i u2 = _mm_madd_epi16(t0, k__cospi_m04_p28);
-      const __m128i u3 = _mm_madd_epi16(t1, k__cospi_m04_p28);
-      const __m128i u4 = _mm_madd_epi16(t2, k__cospi_p12_p20);
-      const __m128i u5 = _mm_madd_epi16(t3, k__cospi_p12_p20);
-      const __m128i u6 = _mm_madd_epi16(t2, k__cospi_m20_p12);
-      const __m128i u7 = _mm_madd_epi16(t3, k__cospi_m20_p12);
-      // dct_const_round_shift
-      const __m128i v0 = _mm_add_epi32(u0, k__DCT_CONST_ROUNDING);
-      const __m128i v1 = _mm_add_epi32(u1, k__DCT_CONST_ROUNDING);
-      const __m128i v2 = _mm_add_epi32(u2, k__DCT_CONST_ROUNDING);
-      const __m128i v3 = _mm_add_epi32(u3, k__DCT_CONST_ROUNDING);
-      const __m128i v4 = _mm_add_epi32(u4, k__DCT_CONST_ROUNDING);
-      const __m128i v5 = _mm_add_epi32(u5, k__DCT_CONST_ROUNDING);
-      const __m128i v6 = _mm_add_epi32(u6, k__DCT_CONST_ROUNDING);
-      const __m128i v7 = _mm_add_epi32(u7, k__DCT_CONST_ROUNDING);
-      const __m128i w0 = _mm_srai_epi32(v0, DCT_CONST_BITS);
-      const __m128i w1 = _mm_srai_epi32(v1, DCT_CONST_BITS);
-      const __m128i w2 = _mm_srai_epi32(v2, DCT_CONST_BITS);
-      const __m128i w3 = _mm_srai_epi32(v3, DCT_CONST_BITS);
-      const __m128i w4 = _mm_srai_epi32(v4, DCT_CONST_BITS);
-      const __m128i w5 = _mm_srai_epi32(v5, DCT_CONST_BITS);
-      const __m128i w6 = _mm_srai_epi32(v6, DCT_CONST_BITS);
-      const __m128i w7 = _mm_srai_epi32(v7, DCT_CONST_BITS);
-      // Combine
-      res1 = _mm_packs_epi32(w0, w1);
-      res7 = _mm_packs_epi32(w2, w3);
-      res5 = _mm_packs_epi32(w4, w5);
-      res3 = _mm_packs_epi32(w6, w7);
-    }
-    // Transpose the 8x8.
-    {
-      // 00 01 02 03 04 05 06 07
-      // 10 11 12 13 14 15 16 17
-      // 20 21 22 23 24 25 26 27
-      // 30 31 32 33 34 35 36 37
-      // 40 41 42 43 44 45 46 47
-      // 50 51 52 53 54 55 56 57
-      // 60 61 62 63 64 65 66 67
-      // 70 71 72 73 74 75 76 77
-      const __m128i tr0_0 = _mm_unpacklo_epi16(res0, res1);
-      const __m128i tr0_1 = _mm_unpacklo_epi16(res2, res3);
-      const __m128i tr0_2 = _mm_unpackhi_epi16(res0, res1);
-      const __m128i tr0_3 = _mm_unpackhi_epi16(res2, res3);
-      const __m128i tr0_4 = _mm_unpacklo_epi16(res4, res5);
-      const __m128i tr0_5 = _mm_unpacklo_epi16(res6, res7);
-      const __m128i tr0_6 = _mm_unpackhi_epi16(res4, res5);
-      const __m128i tr0_7 = _mm_unpackhi_epi16(res6, res7);
-      // 00 10 01 11 02 12 03 13
-      // 20 30 21 31 22 32 23 33
-      // 04 14 05 15 06 16 07 17
-      // 24 34 25 35 26 36 27 37
-      // 40 50 41 51 42 52 43 53
-      // 60 70 61 71 62 72 63 73
-      // 54 54 55 55 56 56 57 57
-      // 64 74 65 75 66 76 67 77
-      const __m128i tr1_0 = _mm_unpacklo_epi32(tr0_0, tr0_1);
-      const __m128i tr1_1 = _mm_unpacklo_epi32(tr0_2, tr0_3);
-      const __m128i tr1_2 = _mm_unpackhi_epi32(tr0_0, tr0_1);
-      const __m128i tr1_3 = _mm_unpackhi_epi32(tr0_2, tr0_3);
-      const __m128i tr1_4 = _mm_unpacklo_epi32(tr0_4, tr0_5);
-      const __m128i tr1_5 = _mm_unpacklo_epi32(tr0_6, tr0_7);
-      const __m128i tr1_6 = _mm_unpackhi_epi32(tr0_4, tr0_5);
-      const __m128i tr1_7 = _mm_unpackhi_epi32(tr0_6, tr0_7);
-      // 00 10 20 30 01 11 21 31
-      // 40 50 60 70 41 51 61 71
-      // 02 12 22 32 03 13 23 33
-      // 42 52 62 72 43 53 63 73
-      // 04 14 24 34 05 15 21 36
-      // 44 54 64 74 45 55 61 76
-      // 06 16 26 36 07 17 27 37
-      // 46 56 66 76 47 57 67 77
-      in0 = _mm_unpacklo_epi64(tr1_0, tr1_4);
-      in1 = _mm_unpackhi_epi64(tr1_0, tr1_4);
-      in2 = _mm_unpacklo_epi64(tr1_2, tr1_6);
-      in3 = _mm_unpackhi_epi64(tr1_2, tr1_6);
-      in4 = _mm_unpacklo_epi64(tr1_1, tr1_5);
-      in5 = _mm_unpackhi_epi64(tr1_1, tr1_5);
-      in6 = _mm_unpacklo_epi64(tr1_3, tr1_7);
-      in7 = _mm_unpackhi_epi64(tr1_3, tr1_7);
-      // 00 10 20 30 40 50 60 70
-      // 01 11 21 31 41 51 61 71
-      // 02 12 22 32 42 52 62 72
-      // 03 13 23 33 43 53 63 73
-      // 04 14 24 34 44 54 64 74
-      // 05 15 25 35 45 55 65 75
-      // 06 16 26 36 46 56 66 76
-      // 07 17 27 37 47 57 67 77
-    }
-  }
-  // Post-condition output and store it
-  {
-    // Post-condition (division by two)
-    //    division of two 16 bits signed numbers using shifts
-    //    n / 2 = (n - (n >> 15)) >> 1
-    const __m128i sign_in0 = _mm_srai_epi16(in0, 15);
-    const __m128i sign_in1 = _mm_srai_epi16(in1, 15);
-    const __m128i sign_in2 = _mm_srai_epi16(in2, 15);
-    const __m128i sign_in3 = _mm_srai_epi16(in3, 15);
-    const __m128i sign_in4 = _mm_srai_epi16(in4, 15);
-    const __m128i sign_in5 = _mm_srai_epi16(in5, 15);
-    const __m128i sign_in6 = _mm_srai_epi16(in6, 15);
-    const __m128i sign_in7 = _mm_srai_epi16(in7, 15);
-    in0 = _mm_sub_epi16(in0, sign_in0);
-    in1 = _mm_sub_epi16(in1, sign_in1);
-    in2 = _mm_sub_epi16(in2, sign_in2);
-    in3 = _mm_sub_epi16(in3, sign_in3);
-    in4 = _mm_sub_epi16(in4, sign_in4);
-    in5 = _mm_sub_epi16(in5, sign_in5);
-    in6 = _mm_sub_epi16(in6, sign_in6);
-    in7 = _mm_sub_epi16(in7, sign_in7);
-    in0 = _mm_srai_epi16(in0, 1);
-    in1 = _mm_srai_epi16(in1, 1);
-    in2 = _mm_srai_epi16(in2, 1);
-    in3 = _mm_srai_epi16(in3, 1);
-    in4 = _mm_srai_epi16(in4, 1);
-    in5 = _mm_srai_epi16(in5, 1);
-    in6 = _mm_srai_epi16(in6, 1);
-    in7 = _mm_srai_epi16(in7, 1);
-    // store results
-    _mm_store_si128((__m128i *)(output + 0 * 8), in0);
-    _mm_store_si128((__m128i *)(output + 1 * 8), in1);
-    _mm_store_si128((__m128i *)(output + 2 * 8), in2);
-    _mm_store_si128((__m128i *)(output + 3 * 8), in3);
-    _mm_store_si128((__m128i *)(output + 4 * 8), in4);
-    _mm_store_si128((__m128i *)(output + 5 * 8), in5);
-    _mm_store_si128((__m128i *)(output + 6 * 8), in6);
-    _mm_store_si128((__m128i *)(output + 7 * 8), in7);
-  }
-}
-
-// load 8x8 array
-static INLINE void load_buffer_8x8_avx2(const int16_t *input, __m128i *in,
-                                   int stride) {
-  in[0]  = _mm_load_si128((const __m128i *)(input + 0 * stride));
-  in[1]  = _mm_load_si128((const __m128i *)(input + 1 * stride));
-  in[2]  = _mm_load_si128((const __m128i *)(input + 2 * stride));
-  in[3]  = _mm_load_si128((const __m128i *)(input + 3 * stride));
-  in[4]  = _mm_load_si128((const __m128i *)(input + 4 * stride));
-  in[5]  = _mm_load_si128((const __m128i *)(input + 5 * stride));
-  in[6]  = _mm_load_si128((const __m128i *)(input + 6 * stride));
-  in[7]  = _mm_load_si128((const __m128i *)(input + 7 * stride));
-
-  in[0] = _mm_slli_epi16(in[0], 2);
-  in[1] = _mm_slli_epi16(in[1], 2);
-  in[2] = _mm_slli_epi16(in[2], 2);
-  in[3] = _mm_slli_epi16(in[3], 2);
-  in[4] = _mm_slli_epi16(in[4], 2);
-  in[5] = _mm_slli_epi16(in[5], 2);
-  in[6] = _mm_slli_epi16(in[6], 2);
-  in[7] = _mm_slli_epi16(in[7], 2);
-}
-
-// right shift and rounding
-static INLINE void right_shift_8x8_avx2(__m128i *res, int const bit) {
-  const __m128i kOne = _mm_set1_epi16(1);
-  const int bit_m02 = bit - 2;
-  __m128i sign0 = _mm_srai_epi16(res[0], 15);
-  __m128i sign1 = _mm_srai_epi16(res[1], 15);
-  __m128i sign2 = _mm_srai_epi16(res[2], 15);
-  __m128i sign3 = _mm_srai_epi16(res[3], 15);
-  __m128i sign4 = _mm_srai_epi16(res[4], 15);
-  __m128i sign5 = _mm_srai_epi16(res[5], 15);
-  __m128i sign6 = _mm_srai_epi16(res[6], 15);
-  __m128i sign7 = _mm_srai_epi16(res[7], 15);
-
-  if (bit_m02 >= 0) {
-    __m128i k_const_rounding = _mm_slli_epi16(kOne, bit_m02);
-    res[0] = _mm_add_epi16(res[0], k_const_rounding);
-    res[1] = _mm_add_epi16(res[1], k_const_rounding);
-    res[2] = _mm_add_epi16(res[2], k_const_rounding);
-    res[3] = _mm_add_epi16(res[3], k_const_rounding);
-    res[4] = _mm_add_epi16(res[4], k_const_rounding);
-    res[5] = _mm_add_epi16(res[5], k_const_rounding);
-    res[6] = _mm_add_epi16(res[6], k_const_rounding);
-    res[7] = _mm_add_epi16(res[7], k_const_rounding);
-  }
-
-  res[0] = _mm_sub_epi16(res[0], sign0);
-  res[1] = _mm_sub_epi16(res[1], sign1);
-  res[2] = _mm_sub_epi16(res[2], sign2);
-  res[3] = _mm_sub_epi16(res[3], sign3);
-  res[4] = _mm_sub_epi16(res[4], sign4);
-  res[5] = _mm_sub_epi16(res[5], sign5);
-  res[6] = _mm_sub_epi16(res[6], sign6);
-  res[7] = _mm_sub_epi16(res[7], sign7);
-
-  res[0] = _mm_srai_epi16(res[0], bit);
-  res[1] = _mm_srai_epi16(res[1], bit);
-  res[2] = _mm_srai_epi16(res[2], bit);
-  res[3] = _mm_srai_epi16(res[3], bit);
-  res[4] = _mm_srai_epi16(res[4], bit);
-  res[5] = _mm_srai_epi16(res[5], bit);
-  res[6] = _mm_srai_epi16(res[6], bit);
-  res[7] = _mm_srai_epi16(res[7], bit);
-}
-
-// write 8x8 array
-static INLINE void write_buffer_8x8_avx2(int16_t *output, __m128i *res, int stride) {
-  _mm_store_si128((__m128i *)(output + 0 * stride), res[0]);
-  _mm_store_si128((__m128i *)(output + 1 * stride), res[1]);
-  _mm_store_si128((__m128i *)(output + 2 * stride), res[2]);
-  _mm_store_si128((__m128i *)(output + 3 * stride), res[3]);
-  _mm_store_si128((__m128i *)(output + 4 * stride), res[4]);
-  _mm_store_si128((__m128i *)(output + 5 * stride), res[5]);
-  _mm_store_si128((__m128i *)(output + 6 * stride), res[6]);
-  _mm_store_si128((__m128i *)(output + 7 * stride), res[7]);
-}
-
-// perform in-place transpose
-static INLINE void array_transpose_8x8_avx2(__m128i *in, __m128i *res) {
-  const __m128i tr0_0 = _mm_unpacklo_epi16(in[0], in[1]);
-  const __m128i tr0_1 = _mm_unpacklo_epi16(in[2], in[3]);
-  const __m128i tr0_2 = _mm_unpackhi_epi16(in[0], in[1]);
-  const __m128i tr0_3 = _mm_unpackhi_epi16(in[2], in[3]);
-  const __m128i tr0_4 = _mm_unpacklo_epi16(in[4], in[5]);
-  const __m128i tr0_5 = _mm_unpacklo_epi16(in[6], in[7]);
-  const __m128i tr0_6 = _mm_unpackhi_epi16(in[4], in[5]);
-  const __m128i tr0_7 = _mm_unpackhi_epi16(in[6], in[7]);
-  // 00 10 01 11 02 12 03 13
-  // 20 30 21 31 22 32 23 33
-  // 04 14 05 15 06 16 07 17
-  // 24 34 25 35 26 36 27 37
-  // 40 50 41 51 42 52 43 53
-  // 60 70 61 71 62 72 63 73
-  // 44 54 45 55 46 56 47 57
-  // 64 74 65 75 66 76 67 77
-  const __m128i tr1_0 = _mm_unpacklo_epi32(tr0_0, tr0_1);
-  const __m128i tr1_1 = _mm_unpacklo_epi32(tr0_4, tr0_5);
-  const __m128i tr1_2 = _mm_unpackhi_epi32(tr0_0, tr0_1);
-  const __m128i tr1_3 = _mm_unpackhi_epi32(tr0_4, tr0_5);
-  const __m128i tr1_4 = _mm_unpacklo_epi32(tr0_2, tr0_3);
-  const __m128i tr1_5 = _mm_unpacklo_epi32(tr0_6, tr0_7);
-  const __m128i tr1_6 = _mm_unpackhi_epi32(tr0_2, tr0_3);
-  const __m128i tr1_7 = _mm_unpackhi_epi32(tr0_6, tr0_7);
-  // 00 10 20 30 01 11 21 31
-  // 40 50 60 70 41 51 61 71
-  // 02 12 22 32 03 13 23 33
-  // 42 52 62 72 43 53 63 73
-  // 04 14 24 34 05 15 25 35
-  // 44 54 64 74 45 55 65 75
-  // 06 16 26 36 07 17 27 37
-  // 46 56 66 76 47 57 67 77
-  res[0] = _mm_unpacklo_epi64(tr1_0, tr1_1);
-  res[1] = _mm_unpackhi_epi64(tr1_0, tr1_1);
-  res[2] = _mm_unpacklo_epi64(tr1_2, tr1_3);
-  res[3] = _mm_unpackhi_epi64(tr1_2, tr1_3);
-  res[4] = _mm_unpacklo_epi64(tr1_4, tr1_5);
-  res[5] = _mm_unpackhi_epi64(tr1_4, tr1_5);
-  res[6] = _mm_unpacklo_epi64(tr1_6, tr1_7);
-  res[7] = _mm_unpackhi_epi64(tr1_6, tr1_7);
-  // 00 10 20 30 40 50 60 70
-  // 01 11 21 31 41 51 61 71
-  // 02 12 22 32 42 52 62 72
-  // 03 13 23 33 43 53 63 73
-  // 04 14 24 34 44 54 64 74
-  // 05 15 25 35 45 55 65 75
-  // 06 16 26 36 46 56 66 76
-  // 07 17 27 37 47 57 67 77
-}
-
-void fdct8_avx2(__m128i *in) {
-  // constants
-  const __m128i k__cospi_p16_p16 = _mm_set1_epi16(cospi_16_64);
-  const __m128i k__cospi_p16_m16 = pair_set_epi16(cospi_16_64, -cospi_16_64);
-  const __m128i k__cospi_p24_p08 = pair_set_epi16(cospi_24_64, cospi_8_64);
-  const __m128i k__cospi_m08_p24 = pair_set_epi16(-cospi_8_64, cospi_24_64);
-  const __m128i k__cospi_p28_p04 = pair_set_epi16(cospi_28_64, cospi_4_64);
-  const __m128i k__cospi_m04_p28 = pair_set_epi16(-cospi_4_64, cospi_28_64);
-  const __m128i k__cospi_p12_p20 = pair_set_epi16(cospi_12_64, cospi_20_64);
-  const __m128i k__cospi_m20_p12 = pair_set_epi16(-cospi_20_64, cospi_12_64);
-  const __m128i k__DCT_CONST_ROUNDING = _mm_set1_epi32(DCT_CONST_ROUNDING);
-  __m128i u0, u1, u2, u3, u4, u5, u6, u7;
-  __m128i v0, v1, v2, v3, v4, v5, v6, v7;
-  __m128i s0, s1, s2, s3, s4, s5, s6, s7;
-
-  // stage 1
-  s0 = _mm_add_epi16(in[0], in[7]);
-  s1 = _mm_add_epi16(in[1], in[6]);
-  s2 = _mm_add_epi16(in[2], in[5]);
-  s3 = _mm_add_epi16(in[3], in[4]);
-  s4 = _mm_sub_epi16(in[3], in[4]);
-  s5 = _mm_sub_epi16(in[2], in[5]);
-  s6 = _mm_sub_epi16(in[1], in[6]);
-  s7 = _mm_sub_epi16(in[0], in[7]);
-
-  u0 = _mm_add_epi16(s0, s3);
-  u1 = _mm_add_epi16(s1, s2);
-  u2 = _mm_sub_epi16(s1, s2);
-  u3 = _mm_sub_epi16(s0, s3);
-  // interleave and perform butterfly multiplication/addition
-  v0 = _mm_unpacklo_epi16(u0, u1);
-  v1 = _mm_unpackhi_epi16(u0, u1);
-  v2 = _mm_unpacklo_epi16(u2, u3);
-  v3 = _mm_unpackhi_epi16(u2, u3);
-
-  u0 = _mm_madd_epi16(v0, k__cospi_p16_p16);
-  u1 = _mm_madd_epi16(v1, k__cospi_p16_p16);
-  u2 = _mm_madd_epi16(v0, k__cospi_p16_m16);
-  u3 = _mm_madd_epi16(v1, k__cospi_p16_m16);
-  u4 = _mm_madd_epi16(v2, k__cospi_p24_p08);
-  u5 = _mm_madd_epi16(v3, k__cospi_p24_p08);
-  u6 = _mm_madd_epi16(v2, k__cospi_m08_p24);
-  u7 = _mm_madd_epi16(v3, k__cospi_m08_p24);
-
-  // shift and rounding
-  v0 = _mm_add_epi32(u0, k__DCT_CONST_ROUNDING);
-  v1 = _mm_add_epi32(u1, k__DCT_CONST_ROUNDING);
-  v2 = _mm_add_epi32(u2, k__DCT_CONST_ROUNDING);
-  v3 = _mm_add_epi32(u3, k__DCT_CONST_ROUNDING);
-  v4 = _mm_add_epi32(u4, k__DCT_CONST_ROUNDING);
-  v5 = _mm_add_epi32(u5, k__DCT_CONST_ROUNDING);
-  v6 = _mm_add_epi32(u6, k__DCT_CONST_ROUNDING);
-  v7 = _mm_add_epi32(u7, k__DCT_CONST_ROUNDING);
-
-  u0 = _mm_srai_epi32(v0, DCT_CONST_BITS);
-  u1 = _mm_srai_epi32(v1, DCT_CONST_BITS);
-  u2 = _mm_srai_epi32(v2, DCT_CONST_BITS);
-  u3 = _mm_srai_epi32(v3, DCT_CONST_BITS);
-  u4 = _mm_srai_epi32(v4, DCT_CONST_BITS);
-  u5 = _mm_srai_epi32(v5, DCT_CONST_BITS);
-  u6 = _mm_srai_epi32(v6, DCT_CONST_BITS);
-  u7 = _mm_srai_epi32(v7, DCT_CONST_BITS);
-
-  in[0] = _mm_packs_epi32(u0, u1);
-  in[2] = _mm_packs_epi32(u4, u5);
-  in[4] = _mm_packs_epi32(u2, u3);
-  in[6] = _mm_packs_epi32(u6, u7);
-
-  // stage 2
-  // interleave and perform butterfly multiplication/addition
-  u0 = _mm_unpacklo_epi16(s6, s5);
-  u1 = _mm_unpackhi_epi16(s6, s5);
-  v0 = _mm_madd_epi16(u0, k__cospi_p16_m16);
-  v1 = _mm_madd_epi16(u1, k__cospi_p16_m16);
-  v2 = _mm_madd_epi16(u0, k__cospi_p16_p16);
-  v3 = _mm_madd_epi16(u1, k__cospi_p16_p16);
-
-  // shift and rounding
-  u0 = _mm_add_epi32(v0, k__DCT_CONST_ROUNDING);
-  u1 = _mm_add_epi32(v1, k__DCT_CONST_ROUNDING);
-  u2 = _mm_add_epi32(v2, k__DCT_CONST_ROUNDING);
-  u3 = _mm_add_epi32(v3, k__DCT_CONST_ROUNDING);
-
-  v0 = _mm_srai_epi32(u0, DCT_CONST_BITS);
-  v1 = _mm_srai_epi32(u1, DCT_CONST_BITS);
-  v2 = _mm_srai_epi32(u2, DCT_CONST_BITS);
-  v3 = _mm_srai_epi32(u3, DCT_CONST_BITS);
-
-  u0 = _mm_packs_epi32(v0, v1);
-  u1 = _mm_packs_epi32(v2, v3);
-
-  // stage 3
-  s0 = _mm_add_epi16(s4, u0);
-  s1 = _mm_sub_epi16(s4, u0);
-  s2 = _mm_sub_epi16(s7, u1);
-  s3 = _mm_add_epi16(s7, u1);
-
-  // stage 4
-  u0 = _mm_unpacklo_epi16(s0, s3);
-  u1 = _mm_unpackhi_epi16(s0, s3);
-  u2 = _mm_unpacklo_epi16(s1, s2);
-  u3 = _mm_unpackhi_epi16(s1, s2);
-
-  v0 = _mm_madd_epi16(u0, k__cospi_p28_p04);
-  v1 = _mm_madd_epi16(u1, k__cospi_p28_p04);
-  v2 = _mm_madd_epi16(u2, k__cospi_p12_p20);
-  v3 = _mm_madd_epi16(u3, k__cospi_p12_p20);
-  v4 = _mm_madd_epi16(u2, k__cospi_m20_p12);
-  v5 = _mm_madd_epi16(u3, k__cospi_m20_p12);
-  v6 = _mm_madd_epi16(u0, k__cospi_m04_p28);
-  v7 = _mm_madd_epi16(u1, k__cospi_m04_p28);
-
-  // shift and rounding
-  u0 = _mm_add_epi32(v0, k__DCT_CONST_ROUNDING);
-  u1 = _mm_add_epi32(v1, k__DCT_CONST_ROUNDING);
-  u2 = _mm_add_epi32(v2, k__DCT_CONST_ROUNDING);
-  u3 = _mm_add_epi32(v3, k__DCT_CONST_ROUNDING);
-  u4 = _mm_add_epi32(v4, k__DCT_CONST_ROUNDING);
-  u5 = _mm_add_epi32(v5, k__DCT_CONST_ROUNDING);
-  u6 = _mm_add_epi32(v6, k__DCT_CONST_ROUNDING);
-  u7 = _mm_add_epi32(v7, k__DCT_CONST_ROUNDING);
-
-  v0 = _mm_srai_epi32(u0, DCT_CONST_BITS);
-  v1 = _mm_srai_epi32(u1, DCT_CONST_BITS);
-  v2 = _mm_srai_epi32(u2, DCT_CONST_BITS);
-  v3 = _mm_srai_epi32(u3, DCT_CONST_BITS);
-  v4 = _mm_srai_epi32(u4, DCT_CONST_BITS);
-  v5 = _mm_srai_epi32(u5, DCT_CONST_BITS);
-  v6 = _mm_srai_epi32(u6, DCT_CONST_BITS);
-  v7 = _mm_srai_epi32(u7, DCT_CONST_BITS);
-
-  in[1] = _mm_packs_epi32(v0, v1);
-  in[3] = _mm_packs_epi32(v4, v5);
-  in[5] = _mm_packs_epi32(v2, v3);
-  in[7] = _mm_packs_epi32(v6, v7);
-
-  // transpose
-  array_transpose_8x8_avx2(in, in);
-}
-
-void fadst8_avx2(__m128i *in) {
-  // Constants
-  const __m128i k__cospi_p02_p30 = pair_set_epi16(cospi_2_64, cospi_30_64);
-  const __m128i k__cospi_p30_m02 = pair_set_epi16(cospi_30_64, -cospi_2_64);
-  const __m128i k__cospi_p10_p22 = pair_set_epi16(cospi_10_64, cospi_22_64);
-  const __m128i k__cospi_p22_m10 = pair_set_epi16(cospi_22_64, -cospi_10_64);
-  const __m128i k__cospi_p18_p14 = pair_set_epi16(cospi_18_64, cospi_14_64);
-  const __m128i k__cospi_p14_m18 = pair_set_epi16(cospi_14_64, -cospi_18_64);
-  const __m128i k__cospi_p26_p06 = pair_set_epi16(cospi_26_64, cospi_6_64);
-  const __m128i k__cospi_p06_m26 = pair_set_epi16(cospi_6_64, -cospi_26_64);
-  const __m128i k__cospi_p08_p24 = pair_set_epi16(cospi_8_64, cospi_24_64);
-  const __m128i k__cospi_p24_m08 = pair_set_epi16(cospi_24_64, -cospi_8_64);
-  const __m128i k__cospi_m24_p08 = pair_set_epi16(-cospi_24_64, cospi_8_64);
-  const __m128i k__cospi_p16_m16 = pair_set_epi16(cospi_16_64, -cospi_16_64);
-  const __m128i k__cospi_p16_p16 = _mm_set1_epi16(cospi_16_64);
-  const __m128i k__const_0 = _mm_set1_epi16(0);
-  const __m128i k__DCT_CONST_ROUNDING = _mm_set1_epi32(DCT_CONST_ROUNDING);
-
-  __m128i u0, u1, u2, u3, u4, u5, u6, u7, u8, u9, u10, u11, u12, u13, u14, u15;
-  __m128i v0, v1, v2, v3, v4, v5, v6, v7, v8, v9, v10, v11, v12, v13, v14, v15;
-  __m128i w0, w1, w2, w3, w4, w5, w6, w7, w8, w9, w10, w11, w12, w13, w14, w15;
-  __m128i s0, s1, s2, s3, s4, s5, s6, s7;
-  __m128i in0, in1, in2, in3, in4, in5, in6, in7;
-
-  // properly aligned for butterfly input
-  in0  = in[7];
-  in1  = in[0];
-  in2  = in[5];
-  in3  = in[2];
-  in4  = in[3];
-  in5  = in[4];
-  in6  = in[1];
-  in7  = in[6];
-
-  // column transformation
-  // stage 1
-  // interleave and multiply/add into 32-bit integer
-  s0 = _mm_unpacklo_epi16(in0, in1);
-  s1 = _mm_unpackhi_epi16(in0, in1);
-  s2 = _mm_unpacklo_epi16(in2, in3);
-  s3 = _mm_unpackhi_epi16(in2, in3);
-  s4 = _mm_unpacklo_epi16(in4, in5);
-  s5 = _mm_unpackhi_epi16(in4, in5);
-  s6 = _mm_unpacklo_epi16(in6, in7);
-  s7 = _mm_unpackhi_epi16(in6, in7);
-
-  u0 = _mm_madd_epi16(s0, k__cospi_p02_p30);
-  u1 = _mm_madd_epi16(s1, k__cospi_p02_p30);
-  u2 = _mm_madd_epi16(s0, k__cospi_p30_m02);
-  u3 = _mm_madd_epi16(s1, k__cospi_p30_m02);
-  u4 = _mm_madd_epi16(s2, k__cospi_p10_p22);
-  u5 = _mm_madd_epi16(s3, k__cospi_p10_p22);
-  u6 = _mm_madd_epi16(s2, k__cospi_p22_m10);
-  u7 = _mm_madd_epi16(s3, k__cospi_p22_m10);
-  u8 = _mm_madd_epi16(s4, k__cospi_p18_p14);
-  u9 = _mm_madd_epi16(s5, k__cospi_p18_p14);
-  u10 = _mm_madd_epi16(s4, k__cospi_p14_m18);
-  u11 = _mm_madd_epi16(s5, k__cospi_p14_m18);
-  u12 = _mm_madd_epi16(s6, k__cospi_p26_p06);
-  u13 = _mm_madd_epi16(s7, k__cospi_p26_p06);
-  u14 = _mm_madd_epi16(s6, k__cospi_p06_m26);
-  u15 = _mm_madd_epi16(s7, k__cospi_p06_m26);
-
-  // addition
-  w0 = _mm_add_epi32(u0, u8);
-  w1 = _mm_add_epi32(u1, u9);
-  w2 = _mm_add_epi32(u2, u10);
-  w3 = _mm_add_epi32(u3, u11);
-  w4 = _mm_add_epi32(u4, u12);
-  w5 = _mm_add_epi32(u5, u13);
-  w6 = _mm_add_epi32(u6, u14);
-  w7 = _mm_add_epi32(u7, u15);
-  w8 = _mm_sub_epi32(u0, u8);
-  w9 = _mm_sub_epi32(u1, u9);
-  w10 = _mm_sub_epi32(u2, u10);
-  w11 = _mm_sub_epi32(u3, u11);
-  w12 = _mm_sub_epi32(u4, u12);
-  w13 = _mm_sub_epi32(u5, u13);
-  w14 = _mm_sub_epi32(u6, u14);
-  w15 = _mm_sub_epi32(u7, u15);
-
-  // shift and rounding
-  v0 = _mm_add_epi32(w0, k__DCT_CONST_ROUNDING);
-  v1 = _mm_add_epi32(w1, k__DCT_CONST_ROUNDING);
-  v2 = _mm_add_epi32(w2, k__DCT_CONST_ROUNDING);
-  v3 = _mm_add_epi32(w3, k__DCT_CONST_ROUNDING);
-  v4 = _mm_add_epi32(w4, k__DCT_CONST_ROUNDING);
-  v5 = _mm_add_epi32(w5, k__DCT_CONST_ROUNDING);
-  v6 = _mm_add_epi32(w6, k__DCT_CONST_ROUNDING);
-  v7 = _mm_add_epi32(w7, k__DCT_CONST_ROUNDING);
-  v8 = _mm_add_epi32(w8, k__DCT_CONST_ROUNDING);
-  v9 = _mm_add_epi32(w9, k__DCT_CONST_ROUNDING);
-  v10 = _mm_add_epi32(w10, k__DCT_CONST_ROUNDING);
-  v11 = _mm_add_epi32(w11, k__DCT_CONST_ROUNDING);
-  v12 = _mm_add_epi32(w12, k__DCT_CONST_ROUNDING);
-  v13 = _mm_add_epi32(w13, k__DCT_CONST_ROUNDING);
-  v14 = _mm_add_epi32(w14, k__DCT_CONST_ROUNDING);
-  v15 = _mm_add_epi32(w15, k__DCT_CONST_ROUNDING);
-
-  u0 = _mm_srai_epi32(v0, DCT_CONST_BITS);
-  u1 = _mm_srai_epi32(v1, DCT_CONST_BITS);
-  u2 = _mm_srai_epi32(v2, DCT_CONST_BITS);
-  u3 = _mm_srai_epi32(v3, DCT_CONST_BITS);
-  u4 = _mm_srai_epi32(v4, DCT_CONST_BITS);
-  u5 = _mm_srai_epi32(v5, DCT_CONST_BITS);
-  u6 = _mm_srai_epi32(v6, DCT_CONST_BITS);
-  u7 = _mm_srai_epi32(v7, DCT_CONST_BITS);
-  u8 = _mm_srai_epi32(v8, DCT_CONST_BITS);
-  u9 = _mm_srai_epi32(v9, DCT_CONST_BITS);
-  u10 = _mm_srai_epi32(v10, DCT_CONST_BITS);
-  u11 = _mm_srai_epi32(v11, DCT_CONST_BITS);
-  u12 = _mm_srai_epi32(v12, DCT_CONST_BITS);
-  u13 = _mm_srai_epi32(v13, DCT_CONST_BITS);
-  u14 = _mm_srai_epi32(v14, DCT_CONST_BITS);
-  u15 = _mm_srai_epi32(v15, DCT_CONST_BITS);
-
-  // back to 16-bit and pack 8 integers into __m128i
-  in[0] = _mm_packs_epi32(u0, u1);
-  in[1] = _mm_packs_epi32(u2, u3);
-  in[2] = _mm_packs_epi32(u4, u5);
-  in[3] = _mm_packs_epi32(u6, u7);
-  in[4] = _mm_packs_epi32(u8, u9);
-  in[5] = _mm_packs_epi32(u10, u11);
-  in[6] = _mm_packs_epi32(u12, u13);
-  in[7] = _mm_packs_epi32(u14, u15);
-
-  // stage 2
-  s0 = _mm_add_epi16(in[0], in[2]);
-  s1 = _mm_add_epi16(in[1], in[3]);
-  s2 = _mm_sub_epi16(in[0], in[2]);
-  s3 = _mm_sub_epi16(in[1], in[3]);
-  u0 = _mm_unpacklo_epi16(in[4], in[5]);
-  u1 = _mm_unpackhi_epi16(in[4], in[5]);
-  u2 = _mm_unpacklo_epi16(in[6], in[7]);
-  u3 = _mm_unpackhi_epi16(in[6], in[7]);
-
-  v0 = _mm_madd_epi16(u0, k__cospi_p08_p24);
-  v1 = _mm_madd_epi16(u1, k__cospi_p08_p24);
-  v2 = _mm_madd_epi16(u0, k__cospi_p24_m08);
-  v3 = _mm_madd_epi16(u1, k__cospi_p24_m08);
-  v4 = _mm_madd_epi16(u2, k__cospi_m24_p08);
-  v5 = _mm_madd_epi16(u3, k__cospi_m24_p08);
-  v6 = _mm_madd_epi16(u2, k__cospi_p08_p24);
-  v7 = _mm_madd_epi16(u3, k__cospi_p08_p24);
-
-  w0 = _mm_add_epi32(v0, v4);
-  w1 = _mm_add_epi32(v1, v5);
-  w2 = _mm_add_epi32(v2, v6);
-  w3 = _mm_add_epi32(v3, v7);
-  w4 = _mm_sub_epi32(v0, v4);
-  w5 = _mm_sub_epi32(v1, v5);
-  w6 = _mm_sub_epi32(v2, v6);
-  w7 = _mm_sub_epi32(v3, v7);
-
-  v0 = _mm_add_epi32(w0, k__DCT_CONST_ROUNDING);
-  v1 = _mm_add_epi32(w1, k__DCT_CONST_ROUNDING);
-  v2 = _mm_add_epi32(w2, k__DCT_CONST_ROUNDING);
-  v3 = _mm_add_epi32(w3, k__DCT_CONST_ROUNDING);
-  v4 = _mm_add_epi32(w4, k__DCT_CONST_ROUNDING);
-  v5 = _mm_add_epi32(w5, k__DCT_CONST_ROUNDING);
-  v6 = _mm_add_epi32(w6, k__DCT_CONST_ROUNDING);
-  v7 = _mm_add_epi32(w7, k__DCT_CONST_ROUNDING);
-
-  u0 = _mm_srai_epi32(v0, DCT_CONST_BITS);
-  u1 = _mm_srai_epi32(v1, DCT_CONST_BITS);
-  u2 = _mm_srai_epi32(v2, DCT_CONST_BITS);
-  u3 = _mm_srai_epi32(v3, DCT_CONST_BITS);
-  u4 = _mm_srai_epi32(v4, DCT_CONST_BITS);
-  u5 = _mm_srai_epi32(v5, DCT_CONST_BITS);
-  u6 = _mm_srai_epi32(v6, DCT_CONST_BITS);
-  u7 = _mm_srai_epi32(v7, DCT_CONST_BITS);
-
-  // back to 16-bit intergers
-  s4 = _mm_packs_epi32(u0, u1);
-  s5 = _mm_packs_epi32(u2, u3);
-  s6 = _mm_packs_epi32(u4, u5);
-  s7 = _mm_packs_epi32(u6, u7);
-
-  // stage 3
-  u0 = _mm_unpacklo_epi16(s2, s3);
-  u1 = _mm_unpackhi_epi16(s2, s3);
-  u2 = _mm_unpacklo_epi16(s6, s7);
-  u3 = _mm_unpackhi_epi16(s6, s7);
-
-  v0 = _mm_madd_epi16(u0, k__cospi_p16_p16);
-  v1 = _mm_madd_epi16(u1, k__cospi_p16_p16);
-  v2 = _mm_madd_epi16(u0, k__cospi_p16_m16);
-  v3 = _mm_madd_epi16(u1, k__cospi_p16_m16);
-  v4 = _mm_madd_epi16(u2, k__cospi_p16_p16);
-  v5 = _mm_madd_epi16(u3, k__cospi_p16_p16);
-  v6 = _mm_madd_epi16(u2, k__cospi_p16_m16);
-  v7 = _mm_madd_epi16(u3, k__cospi_p16_m16);
-
-  u0 = _mm_add_epi32(v0, k__DCT_CONST_ROUNDING);
-  u1 = _mm_add_epi32(v1, k__DCT_CONST_ROUNDING);
-  u2 = _mm_add_epi32(v2, k__DCT_CONST_ROUNDING);
-  u3 = _mm_add_epi32(v3, k__DCT_CONST_ROUNDING);
-  u4 = _mm_add_epi32(v4, k__DCT_CONST_ROUNDING);
-  u5 = _mm_add_epi32(v5, k__DCT_CONST_ROUNDING);
-  u6 = _mm_add_epi32(v6, k__DCT_CONST_ROUNDING);
-  u7 = _mm_add_epi32(v7, k__DCT_CONST_ROUNDING);
-
-  v0 = _mm_srai_epi32(u0, DCT_CONST_BITS);
-  v1 = _mm_srai_epi32(u1, DCT_CONST_BITS);
-  v2 = _mm_srai_epi32(u2, DCT_CONST_BITS);
-  v3 = _mm_srai_epi32(u3, DCT_CONST_BITS);
-  v4 = _mm_srai_epi32(u4, DCT_CONST_BITS);
-  v5 = _mm_srai_epi32(u5, DCT_CONST_BITS);
-  v6 = _mm_srai_epi32(u6, DCT_CONST_BITS);
-  v7 = _mm_srai_epi32(u7, DCT_CONST_BITS);
-
-  s2 = _mm_packs_epi32(v0, v1);
-  s3 = _mm_packs_epi32(v2, v3);
-  s6 = _mm_packs_epi32(v4, v5);
-  s7 = _mm_packs_epi32(v6, v7);
-
-  // FIXME(jingning): do subtract using bit inversion?
-  in[0] = s0;
-  in[1] = _mm_sub_epi16(k__const_0, s4);
-  in[2] = s6;
-  in[3] = _mm_sub_epi16(k__const_0, s2);
-  in[4] = s3;
-  in[5] = _mm_sub_epi16(k__const_0, s7);
-  in[6] = s5;
-  in[7] = _mm_sub_epi16(k__const_0, s1);
-
-  // transpose
-  array_transpose_8x8_avx2(in, in);
-}
-
-void vp9_fht8x8_avx2(const int16_t *input, int16_t *output,
-                     int stride, int tx_type) {
-  __m128i in[8];
-
-  switch (tx_type) {
-    case DCT_DCT:
-      vp9_fdct8x8_avx2(input, output, stride);
-      break;
-    case ADST_DCT:
-      load_buffer_8x8_avx2(input, in, stride);
-      fadst8_avx2(in);
-      fdct8_avx2(in);
-      right_shift_8x8_avx2(in, 1);
-      write_buffer_8x8_avx2(output, in, 8);
-      break;
-    case DCT_ADST:
-      load_buffer_8x8_avx2(input, in, stride);
-      fdct8_avx2(in);
-      fadst8_avx2(in);
-      right_shift_8x8_avx2(in, 1);
-      write_buffer_8x8_avx2(output, in, 8);
-      break;
-    case ADST_ADST:
-      load_buffer_8x8_avx2(input, in, stride);
-      fadst8_avx2(in);
-      fadst8_avx2(in);
-      right_shift_8x8_avx2(in, 1);
-      write_buffer_8x8_avx2(output, in, 8);
-      break;
-    default:
-      assert(0);
-      break;
-  }
-}
-
-void vp9_fdct16x16_avx2(const int16_t *input, int16_t *output, int stride) {
-  // The 2D transform is done with two passes which are actually pretty
-  // similar. In the first one, we transform the columns and transpose
-  // the results. In the second one, we transform the rows. To achieve that,
-  // as the first pass results are transposed, we transpose the columns (that
-  // is the transposed rows) and transpose the results (so that it goes back
-  // in normal/row positions).
-  int pass;
-  // We need an intermediate buffer between passes.
-  DECLARE_ALIGNED_ARRAY(16, int16_t, intermediate, 256);
-  const int16_t *in = input;
-  int16_t *out = intermediate;
-  // Constants
-  //    When we use them, in one case, they are all the same. In all others
-  //    it's a pair of them that we need to repeat four times. This is done
-  //    by constructing the 32 bit constant corresponding to that pair.
-  const __m128i k__cospi_p16_p16 = _mm_set1_epi16(cospi_16_64);
-  const __m128i k__cospi_p16_m16 = pair_set_epi16(cospi_16_64, -cospi_16_64);
-  const __m128i k__cospi_p24_p08 = pair_set_epi16(cospi_24_64, cospi_8_64);
-  const __m128i k__cospi_m24_m08 = pair_set_epi16(-cospi_24_64, -cospi_8_64);
-  const __m128i k__cospi_m08_p24 = pair_set_epi16(-cospi_8_64, cospi_24_64);
-  const __m128i k__cospi_p28_p04 = pair_set_epi16(cospi_28_64, cospi_4_64);
-  const __m128i k__cospi_m04_p28 = pair_set_epi16(-cospi_4_64, cospi_28_64);
-  const __m128i k__cospi_p12_p20 = pair_set_epi16(cospi_12_64, cospi_20_64);
-  const __m128i k__cospi_m20_p12 = pair_set_epi16(-cospi_20_64, cospi_12_64);
-  const __m128i k__cospi_p30_p02 = pair_set_epi16(cospi_30_64, cospi_2_64);
-  const __m128i k__cospi_p14_p18 = pair_set_epi16(cospi_14_64, cospi_18_64);
-  const __m128i k__cospi_m02_p30 = pair_set_epi16(-cospi_2_64, cospi_30_64);
-  const __m128i k__cospi_m18_p14 = pair_set_epi16(-cospi_18_64, cospi_14_64);
-  const __m128i k__cospi_p22_p10 = pair_set_epi16(cospi_22_64, cospi_10_64);
-  const __m128i k__cospi_p06_p26 = pair_set_epi16(cospi_6_64, cospi_26_64);
-  const __m128i k__cospi_m10_p22 = pair_set_epi16(-cospi_10_64, cospi_22_64);
-  const __m128i k__cospi_m26_p06 = pair_set_epi16(-cospi_26_64, cospi_6_64);
-  const __m128i k__DCT_CONST_ROUNDING = _mm_set1_epi32(DCT_CONST_ROUNDING);
-  const __m128i kOne = _mm_set1_epi16(1);
-  // Do the two transform/transpose passes
-  for (pass = 0; pass < 2; ++pass) {
-    // We process eight columns (transposed rows in second pass) at a time.
-    int column_start;
-    for (column_start = 0; column_start < 16; column_start += 8) {
-      __m128i in00, in01, in02, in03, in04, in05, in06, in07;
-      __m128i in08, in09, in10, in11, in12, in13, in14, in15;
-      __m128i input0, input1, input2, input3, input4, input5, input6, input7;
-      __m128i step1_0, step1_1, step1_2, step1_3;
-      __m128i step1_4, step1_5, step1_6, step1_7;
-      __m128i step2_1, step2_2, step2_3, step2_4, step2_5, step2_6;
-      __m128i step3_0, step3_1, step3_2, step3_3;
-      __m128i step3_4, step3_5, step3_6, step3_7;
-      __m128i res00, res01, res02, res03, res04, res05, res06, res07;
-      __m128i res08, res09, res10, res11, res12, res13, res14, res15;
-      // Load and pre-condition input.
-      if (0 == pass) {
-        in00  = _mm_load_si128((const __m128i *)(in +  0 * stride));
-        in01  = _mm_load_si128((const __m128i *)(in +  1 * stride));
-        in02  = _mm_load_si128((const __m128i *)(in +  2 * stride));
-        in03  = _mm_load_si128((const __m128i *)(in +  3 * stride));
-        in04  = _mm_load_si128((const __m128i *)(in +  4 * stride));
-        in05  = _mm_load_si128((const __m128i *)(in +  5 * stride));
-        in06  = _mm_load_si128((const __m128i *)(in +  6 * stride));
-        in07  = _mm_load_si128((const __m128i *)(in +  7 * stride));
-        in08  = _mm_load_si128((const __m128i *)(in +  8 * stride));
-        in09  = _mm_load_si128((const __m128i *)(in +  9 * stride));
-        in10  = _mm_load_si128((const __m128i *)(in + 10 * stride));
-        in11  = _mm_load_si128((const __m128i *)(in + 11 * stride));
-        in12  = _mm_load_si128((const __m128i *)(in + 12 * stride));
-        in13  = _mm_load_si128((const __m128i *)(in + 13 * stride));
-        in14  = _mm_load_si128((const __m128i *)(in + 14 * stride));
-        in15  = _mm_load_si128((const __m128i *)(in + 15 * stride));
-        // x = x << 2
-        in00 = _mm_slli_epi16(in00, 2);
-        in01 = _mm_slli_epi16(in01, 2);
-        in02 = _mm_slli_epi16(in02, 2);
-        in03 = _mm_slli_epi16(in03, 2);
-        in04 = _mm_slli_epi16(in04, 2);
-        in05 = _mm_slli_epi16(in05, 2);
-        in06 = _mm_slli_epi16(in06, 2);
-        in07 = _mm_slli_epi16(in07, 2);
-        in08 = _mm_slli_epi16(in08, 2);
-        in09 = _mm_slli_epi16(in09, 2);
-        in10 = _mm_slli_epi16(in10, 2);
-        in11 = _mm_slli_epi16(in11, 2);
-        in12 = _mm_slli_epi16(in12, 2);
-        in13 = _mm_slli_epi16(in13, 2);
-        in14 = _mm_slli_epi16(in14, 2);
-        in15 = _mm_slli_epi16(in15, 2);
-      } else {
-        in00  = _mm_load_si128((const __m128i *)(in +  0 * 16));
-        in01  = _mm_load_si128((const __m128i *)(in +  1 * 16));
-        in02  = _mm_load_si128((const __m128i *)(in +  2 * 16));
-        in03  = _mm_load_si128((const __m128i *)(in +  3 * 16));
-        in04  = _mm_load_si128((const __m128i *)(in +  4 * 16));
-        in05  = _mm_load_si128((const __m128i *)(in +  5 * 16));
-        in06  = _mm_load_si128((const __m128i *)(in +  6 * 16));
-        in07  = _mm_load_si128((const __m128i *)(in +  7 * 16));
-        in08  = _mm_load_si128((const __m128i *)(in +  8 * 16));
-        in09  = _mm_load_si128((const __m128i *)(in +  9 * 16));
-        in10  = _mm_load_si128((const __m128i *)(in + 10 * 16));
-        in11  = _mm_load_si128((const __m128i *)(in + 11 * 16));
-        in12  = _mm_load_si128((const __m128i *)(in + 12 * 16));
-        in13  = _mm_load_si128((const __m128i *)(in + 13 * 16));
-        in14  = _mm_load_si128((const __m128i *)(in + 14 * 16));
-        in15  = _mm_load_si128((const __m128i *)(in + 15 * 16));
-        // x = (x + 1) >> 2
-        in00 = _mm_add_epi16(in00, kOne);
-        in01 = _mm_add_epi16(in01, kOne);
-        in02 = _mm_add_epi16(in02, kOne);
-        in03 = _mm_add_epi16(in03, kOne);
-        in04 = _mm_add_epi16(in04, kOne);
-        in05 = _mm_add_epi16(in05, kOne);
-        in06 = _mm_add_epi16(in06, kOne);
-        in07 = _mm_add_epi16(in07, kOne);
-        in08 = _mm_add_epi16(in08, kOne);
-        in09 = _mm_add_epi16(in09, kOne);
-        in10 = _mm_add_epi16(in10, kOne);
-        in11 = _mm_add_epi16(in11, kOne);
-        in12 = _mm_add_epi16(in12, kOne);
-        in13 = _mm_add_epi16(in13, kOne);
-        in14 = _mm_add_epi16(in14, kOne);
-        in15 = _mm_add_epi16(in15, kOne);
-        in00 = _mm_srai_epi16(in00, 2);
-        in01 = _mm_srai_epi16(in01, 2);
-        in02 = _mm_srai_epi16(in02, 2);
-        in03 = _mm_srai_epi16(in03, 2);
-        in04 = _mm_srai_epi16(in04, 2);
-        in05 = _mm_srai_epi16(in05, 2);
-        in06 = _mm_srai_epi16(in06, 2);
-        in07 = _mm_srai_epi16(in07, 2);
-        in08 = _mm_srai_epi16(in08, 2);
-        in09 = _mm_srai_epi16(in09, 2);
-        in10 = _mm_srai_epi16(in10, 2);
-        in11 = _mm_srai_epi16(in11, 2);
-        in12 = _mm_srai_epi16(in12, 2);
-        in13 = _mm_srai_epi16(in13, 2);
-        in14 = _mm_srai_epi16(in14, 2);
-        in15 = _mm_srai_epi16(in15, 2);
-      }
-      in += 8;
-      // Calculate input for the first 8 results.
-      {
-        input0 = _mm_add_epi16(in00, in15);
-        input1 = _mm_add_epi16(in01, in14);
-        input2 = _mm_add_epi16(in02, in13);
-        input3 = _mm_add_epi16(in03, in12);
-        input4 = _mm_add_epi16(in04, in11);
-        input5 = _mm_add_epi16(in05, in10);
-        input6 = _mm_add_epi16(in06, in09);
-        input7 = _mm_add_epi16(in07, in08);
-      }
-      // Calculate input for the next 8 results.
-      {
-        step1_0 = _mm_sub_epi16(in07, in08);
-        step1_1 = _mm_sub_epi16(in06, in09);
-        step1_2 = _mm_sub_epi16(in05, in10);
-        step1_3 = _mm_sub_epi16(in04, in11);
-        step1_4 = _mm_sub_epi16(in03, in12);
-        step1_5 = _mm_sub_epi16(in02, in13);
-        step1_6 = _mm_sub_epi16(in01, in14);
-        step1_7 = _mm_sub_epi16(in00, in15);
-      }
-      // Work on the first eight values; fdct8(input, even_results);
-      {
-        // Add/subtract
-        const __m128i q0 = _mm_add_epi16(input0, input7);
-        const __m128i q1 = _mm_add_epi16(input1, input6);
-        const __m128i q2 = _mm_add_epi16(input2, input5);
-        const __m128i q3 = _mm_add_epi16(input3, input4);
-        const __m128i q4 = _mm_sub_epi16(input3, input4);
-        const __m128i q5 = _mm_sub_epi16(input2, input5);
-        const __m128i q6 = _mm_sub_epi16(input1, input6);
-        const __m128i q7 = _mm_sub_epi16(input0, input7);
-        // Work on first four results
-        {
-          // Add/subtract
-          const __m128i r0 = _mm_add_epi16(q0, q3);
-          const __m128i r1 = _mm_add_epi16(q1, q2);
-          const __m128i r2 = _mm_sub_epi16(q1, q2);
-          const __m128i r3 = _mm_sub_epi16(q0, q3);
-          // Interleave to do the multiply by constants which gets us
-          // into 32 bits.
-          const __m128i t0 = _mm_unpacklo_epi16(r0, r1);
-          const __m128i t1 = _mm_unpackhi_epi16(r0, r1);
-          const __m128i t2 = _mm_unpacklo_epi16(r2, r3);
-          const __m128i t3 = _mm_unpackhi_epi16(r2, r3);
-          const __m128i u0 = _mm_madd_epi16(t0, k__cospi_p16_p16);
-          const __m128i u1 = _mm_madd_epi16(t1, k__cospi_p16_p16);
-          const __m128i u2 = _mm_madd_epi16(t0, k__cospi_p16_m16);
-          const __m128i u3 = _mm_madd_epi16(t1, k__cospi_p16_m16);
-          const __m128i u4 = _mm_madd_epi16(t2, k__cospi_p24_p08);
-          const __m128i u5 = _mm_madd_epi16(t3, k__cospi_p24_p08);
-          const __m128i u6 = _mm_madd_epi16(t2, k__cospi_m08_p24);
-          const __m128i u7 = _mm_madd_epi16(t3, k__cospi_m08_p24);
-          // dct_const_round_shift
-          const __m128i v0 = _mm_add_epi32(u0, k__DCT_CONST_ROUNDING);
-          const __m128i v1 = _mm_add_epi32(u1, k__DCT_CONST_ROUNDING);
-          const __m128i v2 = _mm_add_epi32(u2, k__DCT_CONST_ROUNDING);
-          const __m128i v3 = _mm_add_epi32(u3, k__DCT_CONST_ROUNDING);
-          const __m128i v4 = _mm_add_epi32(u4, k__DCT_CONST_ROUNDING);
-          const __m128i v5 = _mm_add_epi32(u5, k__DCT_CONST_ROUNDING);
-          const __m128i v6 = _mm_add_epi32(u6, k__DCT_CONST_ROUNDING);
-          const __m128i v7 = _mm_add_epi32(u7, k__DCT_CONST_ROUNDING);
-          const __m128i w0 = _mm_srai_epi32(v0, DCT_CONST_BITS);
-          const __m128i w1 = _mm_srai_epi32(v1, DCT_CONST_BITS);
-          const __m128i w2 = _mm_srai_epi32(v2, DCT_CONST_BITS);
-          const __m128i w3 = _mm_srai_epi32(v3, DCT_CONST_BITS);
-          const __m128i w4 = _mm_srai_epi32(v4, DCT_CONST_BITS);
-          const __m128i w5 = _mm_srai_epi32(v5, DCT_CONST_BITS);
-          const __m128i w6 = _mm_srai_epi32(v6, DCT_CONST_BITS);
-          const __m128i w7 = _mm_srai_epi32(v7, DCT_CONST_BITS);
-          // Combine
-          res00 = _mm_packs_epi32(w0, w1);
-          res08 = _mm_packs_epi32(w2, w3);
-          res04 = _mm_packs_epi32(w4, w5);
-          res12 = _mm_packs_epi32(w6, w7);
-        }
-        // Work on next four results
-        {
-          // Interleave to do the multiply by constants which gets us
-          // into 32 bits.
-          const __m128i d0 = _mm_unpacklo_epi16(q6, q5);
-          const __m128i d1 = _mm_unpackhi_epi16(q6, q5);
-          const __m128i e0 = _mm_madd_epi16(d0, k__cospi_p16_m16);
-          const __m128i e1 = _mm_madd_epi16(d1, k__cospi_p16_m16);
-          const __m128i e2 = _mm_madd_epi16(d0, k__cospi_p16_p16);
-          const __m128i e3 = _mm_madd_epi16(d1, k__cospi_p16_p16);
-          // dct_const_round_shift
-          const __m128i f0 = _mm_add_epi32(e0, k__DCT_CONST_ROUNDING);
-          const __m128i f1 = _mm_add_epi32(e1, k__DCT_CONST_ROUNDING);
-          const __m128i f2 = _mm_add_epi32(e2, k__DCT_CONST_ROUNDING);
-          const __m128i f3 = _mm_add_epi32(e3, k__DCT_CONST_ROUNDING);
-          const __m128i s0 = _mm_srai_epi32(f0, DCT_CONST_BITS);
-          const __m128i s1 = _mm_srai_epi32(f1, DCT_CONST_BITS);
-          const __m128i s2 = _mm_srai_epi32(f2, DCT_CONST_BITS);
-          const __m128i s3 = _mm_srai_epi32(f3, DCT_CONST_BITS);
-          // Combine
-          const __m128i r0 = _mm_packs_epi32(s0, s1);
-          const __m128i r1 = _mm_packs_epi32(s2, s3);
-          // Add/subtract
-          const __m128i x0 = _mm_add_epi16(q4, r0);
-          const __m128i x1 = _mm_sub_epi16(q4, r0);
-          const __m128i x2 = _mm_sub_epi16(q7, r1);
-          const __m128i x3 = _mm_add_epi16(q7, r1);
-          // Interleave to do the multiply by constants which gets us
-          // into 32 bits.
-          const __m128i t0 = _mm_unpacklo_epi16(x0, x3);
-          const __m128i t1 = _mm_unpackhi_epi16(x0, x3);
-          const __m128i t2 = _mm_unpacklo_epi16(x1, x2);
-          const __m128i t3 = _mm_unpackhi_epi16(x1, x2);
-          const __m128i u0 = _mm_madd_epi16(t0, k__cospi_p28_p04);
-          const __m128i u1 = _mm_madd_epi16(t1, k__cospi_p28_p04);
-          const __m128i u2 = _mm_madd_epi16(t0, k__cospi_m04_p28);
-          const __m128i u3 = _mm_madd_epi16(t1, k__cospi_m04_p28);
-          const __m128i u4 = _mm_madd_epi16(t2, k__cospi_p12_p20);
-          const __m128i u5 = _mm_madd_epi16(t3, k__cospi_p12_p20);
-          const __m128i u6 = _mm_madd_epi16(t2, k__cospi_m20_p12);
-          const __m128i u7 = _mm_madd_epi16(t3, k__cospi_m20_p12);
-          // dct_const_round_shift
-          const __m128i v0 = _mm_add_epi32(u0, k__DCT_CONST_ROUNDING);
-          const __m128i v1 = _mm_add_epi32(u1, k__DCT_CONST_ROUNDING);
-          const __m128i v2 = _mm_add_epi32(u2, k__DCT_CONST_ROUNDING);
-          const __m128i v3 = _mm_add_epi32(u3, k__DCT_CONST_ROUNDING);
-          const __m128i v4 = _mm_add_epi32(u4, k__DCT_CONST_ROUNDING);
-          const __m128i v5 = _mm_add_epi32(u5, k__DCT_CONST_ROUNDING);
-          const __m128i v6 = _mm_add_epi32(u6, k__DCT_CONST_ROUNDING);
-          const __m128i v7 = _mm_add_epi32(u7, k__DCT_CONST_ROUNDING);
-          const __m128i w0 = _mm_srai_epi32(v0, DCT_CONST_BITS);
-          const __m128i w1 = _mm_srai_epi32(v1, DCT_CONST_BITS);
-          const __m128i w2 = _mm_srai_epi32(v2, DCT_CONST_BITS);
-          const __m128i w3 = _mm_srai_epi32(v3, DCT_CONST_BITS);
-          const __m128i w4 = _mm_srai_epi32(v4, DCT_CONST_BITS);
-          const __m128i w5 = _mm_srai_epi32(v5, DCT_CONST_BITS);
-          const __m128i w6 = _mm_srai_epi32(v6, DCT_CONST_BITS);
-          const __m128i w7 = _mm_srai_epi32(v7, DCT_CONST_BITS);
-          // Combine
-          res02 = _mm_packs_epi32(w0, w1);
-          res14 = _mm_packs_epi32(w2, w3);
-          res10 = _mm_packs_epi32(w4, w5);
-          res06 = _mm_packs_epi32(w6, w7);
-        }
-      }
-      // Work on the next eight values; step1 -> odd_results
-      {
-        // step 2
-        {
-          const __m128i t0 = _mm_unpacklo_epi16(step1_5, step1_2);
-          const __m128i t1 = _mm_unpackhi_epi16(step1_5, step1_2);
-          const __m128i t2 = _mm_unpacklo_epi16(step1_4, step1_3);
-          const __m128i t3 = _mm_unpackhi_epi16(step1_4, step1_3);
-          const __m128i u0 = _mm_madd_epi16(t0, k__cospi_p16_m16);
-          const __m128i u1 = _mm_madd_epi16(t1, k__cospi_p16_m16);
-          const __m128i u2 = _mm_madd_epi16(t2, k__cospi_p16_m16);
-          const __m128i u3 = _mm_madd_epi16(t3, k__cospi_p16_m16);
-          // dct_const_round_shift
-          const __m128i v0 = _mm_add_epi32(u0, k__DCT_CONST_ROUNDING);
-          const __m128i v1 = _mm_add_epi32(u1, k__DCT_CONST_ROUNDING);
-          const __m128i v2 = _mm_add_epi32(u2, k__DCT_CONST_ROUNDING);
-          const __m128i v3 = _mm_add_epi32(u3, k__DCT_CONST_ROUNDING);
-          const __m128i w0 = _mm_srai_epi32(v0, DCT_CONST_BITS);
-          const __m128i w1 = _mm_srai_epi32(v1, DCT_CONST_BITS);
-          const __m128i w2 = _mm_srai_epi32(v2, DCT_CONST_BITS);
-          const __m128i w3 = _mm_srai_epi32(v3, DCT_CONST_BITS);
-          // Combine
-          step2_2 = _mm_packs_epi32(w0, w1);
-          step2_3 = _mm_packs_epi32(w2, w3);
-        }
-        {
-          const __m128i t0 = _mm_unpacklo_epi16(step1_5, step1_2);
-          const __m128i t1 = _mm_unpackhi_epi16(step1_5, step1_2);
-          const __m128i t2 = _mm_unpacklo_epi16(step1_4, step1_3);
-          const __m128i t3 = _mm_unpackhi_epi16(step1_4, step1_3);
-          const __m128i u0 = _mm_madd_epi16(t0, k__cospi_p16_p16);
-          const __m128i u1 = _mm_madd_epi16(t1, k__cospi_p16_p16);
-          const __m128i u2 = _mm_madd_epi16(t2, k__cospi_p16_p16);
-          const __m128i u3 = _mm_madd_epi16(t3, k__cospi_p16_p16);
-          // dct_const_round_shift
-          const __m128i v0 = _mm_add_epi32(u0, k__DCT_CONST_ROUNDING);
-          const __m128i v1 = _mm_add_epi32(u1, k__DCT_CONST_ROUNDING);
-          const __m128i v2 = _mm_add_epi32(u2, k__DCT_CONST_ROUNDING);
-          const __m128i v3 = _mm_add_epi32(u3, k__DCT_CONST_ROUNDING);
-          const __m128i w0 = _mm_srai_epi32(v0, DCT_CONST_BITS);
-          const __m128i w1 = _mm_srai_epi32(v1, DCT_CONST_BITS);
-          const __m128i w2 = _mm_srai_epi32(v2, DCT_CONST_BITS);
-          const __m128i w3 = _mm_srai_epi32(v3, DCT_CONST_BITS);
-          // Combine
-          step2_5 = _mm_packs_epi32(w0, w1);
-          step2_4 = _mm_packs_epi32(w2, w3);
-        }
-        // step 3
-        {
-          step3_0 = _mm_add_epi16(step1_0, step2_3);
-          step3_1 = _mm_add_epi16(step1_1, step2_2);
-          step3_2 = _mm_sub_epi16(step1_1, step2_2);
-          step3_3 = _mm_sub_epi16(step1_0, step2_3);
-          step3_4 = _mm_sub_epi16(step1_7, step2_4);
-          step3_5 = _mm_sub_epi16(step1_6, step2_5);
-          step3_6 = _mm_add_epi16(step1_6, step2_5);
-          step3_7 = _mm_add_epi16(step1_7, step2_4);
-        }
-        // step 4
-        {
-          const __m128i t0 = _mm_unpacklo_epi16(step3_1, step3_6);
-          const __m128i t1 = _mm_unpackhi_epi16(step3_1, step3_6);
-          const __m128i t2 = _mm_unpacklo_epi16(step3_2, step3_5);
-          const __m128i t3 = _mm_unpackhi_epi16(step3_2, step3_5);
-          const __m128i u0 = _mm_madd_epi16(t0, k__cospi_m08_p24);
-          const __m128i u1 = _mm_madd_epi16(t1, k__cospi_m08_p24);
-          const __m128i u2 = _mm_madd_epi16(t2, k__cospi_m24_m08);
-          const __m128i u3 = _mm_madd_epi16(t3, k__cospi_m24_m08);
-          // dct_const_round_shift
-          const __m128i v0 = _mm_add_epi32(u0, k__DCT_CONST_ROUNDING);
-          const __m128i v1 = _mm_add_epi32(u1, k__DCT_CONST_ROUNDING);
-          const __m128i v2 = _mm_add_epi32(u2, k__DCT_CONST_ROUNDING);
-          const __m128i v3 = _mm_add_epi32(u3, k__DCT_CONST_ROUNDING);
-          const __m128i w0 = _mm_srai_epi32(v0, DCT_CONST_BITS);
-          const __m128i w1 = _mm_srai_epi32(v1, DCT_CONST_BITS);
-          const __m128i w2 = _mm_srai_epi32(v2, DCT_CONST_BITS);
-          const __m128i w3 = _mm_srai_epi32(v3, DCT_CONST_BITS);
-          // Combine
-          step2_1 = _mm_packs_epi32(w0, w1);
-          step2_2 = _mm_packs_epi32(w2, w3);
-        }
-        {
-          const __m128i t0 = _mm_unpacklo_epi16(step3_1, step3_6);
-          const __m128i t1 = _mm_unpackhi_epi16(step3_1, step3_6);
-          const __m128i t2 = _mm_unpacklo_epi16(step3_2, step3_5);
-          const __m128i t3 = _mm_unpackhi_epi16(step3_2, step3_5);
-          const __m128i u0 = _mm_madd_epi16(t0, k__cospi_p24_p08);
-          const __m128i u1 = _mm_madd_epi16(t1, k__cospi_p24_p08);
-          const __m128i u2 = _mm_madd_epi16(t2, k__cospi_m08_p24);
-          const __m128i u3 = _mm_madd_epi16(t3, k__cospi_m08_p24);
-          // dct_const_round_shift
-          const __m128i v0 = _mm_add_epi32(u0, k__DCT_CONST_ROUNDING);
-          const __m128i v1 = _mm_add_epi32(u1, k__DCT_CONST_ROUNDING);
-          const __m128i v2 = _mm_add_epi32(u2, k__DCT_CONST_ROUNDING);
-          const __m128i v3 = _mm_add_epi32(u3, k__DCT_CONST_ROUNDING);
-          const __m128i w0 = _mm_srai_epi32(v0, DCT_CONST_BITS);
-          const __m128i w1 = _mm_srai_epi32(v1, DCT_CONST_BITS);
-          const __m128i w2 = _mm_srai_epi32(v2, DCT_CONST_BITS);
-          const __m128i w3 = _mm_srai_epi32(v3, DCT_CONST_BITS);
-          // Combine
-          step2_6 = _mm_packs_epi32(w0, w1);
-          step2_5 = _mm_packs_epi32(w2, w3);
-        }
-        // step 5
-        {
-          step1_0 = _mm_add_epi16(step3_0, step2_1);
-          step1_1 = _mm_sub_epi16(step3_0, step2_1);
-          step1_2 = _mm_sub_epi16(step3_3, step2_2);
-          step1_3 = _mm_add_epi16(step3_3, step2_2);
-          step1_4 = _mm_add_epi16(step3_4, step2_5);
-          step1_5 = _mm_sub_epi16(step3_4, step2_5);
-          step1_6 = _mm_sub_epi16(step3_7, step2_6);
-          step1_7 = _mm_add_epi16(step3_7, step2_6);
-        }
-        // step 6
-        {
-          const __m128i t0 = _mm_unpacklo_epi16(step1_0, step1_7);
-          const __m128i t1 = _mm_unpackhi_epi16(step1_0, step1_7);
-          const __m128i t2 = _mm_unpacklo_epi16(step1_1, step1_6);
-          const __m128i t3 = _mm_unpackhi_epi16(step1_1, step1_6);
-          const __m128i u0 = _mm_madd_epi16(t0, k__cospi_p30_p02);
-          const __m128i u1 = _mm_madd_epi16(t1, k__cospi_p30_p02);
-          const __m128i u2 = _mm_madd_epi16(t2, k__cospi_p14_p18);
-          const __m128i u3 = _mm_madd_epi16(t3, k__cospi_p14_p18);
-          // dct_const_round_shift
-          const __m128i v0 = _mm_add_epi32(u0, k__DCT_CONST_ROUNDING);
-          const __m128i v1 = _mm_add_epi32(u1, k__DCT_CONST_ROUNDING);
-          const __m128i v2 = _mm_add_epi32(u2, k__DCT_CONST_ROUNDING);
-          const __m128i v3 = _mm_add_epi32(u3, k__DCT_CONST_ROUNDING);
-          const __m128i w0 = _mm_srai_epi32(v0, DCT_CONST_BITS);
-          const __m128i w1 = _mm_srai_epi32(v1, DCT_CONST_BITS);
-          const __m128i w2 = _mm_srai_epi32(v2, DCT_CONST_BITS);
-          const __m128i w3 = _mm_srai_epi32(v3, DCT_CONST_BITS);
-          // Combine
-          res01 = _mm_packs_epi32(w0, w1);
-          res09 = _mm_packs_epi32(w2, w3);
-        }
-        {
-          const __m128i t0 = _mm_unpacklo_epi16(step1_2, step1_5);
-          const __m128i t1 = _mm_unpackhi_epi16(step1_2, step1_5);
-          const __m128i t2 = _mm_unpacklo_epi16(step1_3, step1_4);
-          const __m128i t3 = _mm_unpackhi_epi16(step1_3, step1_4);
-          const __m128i u0 = _mm_madd_epi16(t0, k__cospi_p22_p10);
-          const __m128i u1 = _mm_madd_epi16(t1, k__cospi_p22_p10);
-          const __m128i u2 = _mm_madd_epi16(t2, k__cospi_p06_p26);
-          const __m128i u3 = _mm_madd_epi16(t3, k__cospi_p06_p26);
-          // dct_const_round_shift
-          const __m128i v0 = _mm_add_epi32(u0, k__DCT_CONST_ROUNDING);
-          const __m128i v1 = _mm_add_epi32(u1, k__DCT_CONST_ROUNDING);
-          const __m128i v2 = _mm_add_epi32(u2, k__DCT_CONST_ROUNDING);
-          const __m128i v3 = _mm_add_epi32(u3, k__DCT_CONST_ROUNDING);
-          const __m128i w0 = _mm_srai_epi32(v0, DCT_CONST_BITS);
-          const __m128i w1 = _mm_srai_epi32(v1, DCT_CONST_BITS);
-          const __m128i w2 = _mm_srai_epi32(v2, DCT_CONST_BITS);
-          const __m128i w3 = _mm_srai_epi32(v3, DCT_CONST_BITS);
-          // Combine
-          res05 = _mm_packs_epi32(w0, w1);
-          res13 = _mm_packs_epi32(w2, w3);
-        }
-        {
-          const __m128i t0 = _mm_unpacklo_epi16(step1_2, step1_5);
-          const __m128i t1 = _mm_unpackhi_epi16(step1_2, step1_5);
-          const __m128i t2 = _mm_unpacklo_epi16(step1_3, step1_4);
-          const __m128i t3 = _mm_unpackhi_epi16(step1_3, step1_4);
-          const __m128i u0 = _mm_madd_epi16(t0, k__cospi_m10_p22);
-          const __m128i u1 = _mm_madd_epi16(t1, k__cospi_m10_p22);
-          const __m128i u2 = _mm_madd_epi16(t2, k__cospi_m26_p06);
-          const __m128i u3 = _mm_madd_epi16(t3, k__cospi_m26_p06);
-          // dct_const_round_shift
-          const __m128i v0 = _mm_add_epi32(u0, k__DCT_CONST_ROUNDING);
-          const __m128i v1 = _mm_add_epi32(u1, k__DCT_CONST_ROUNDING);
-          const __m128i v2 = _mm_add_epi32(u2, k__DCT_CONST_ROUNDING);
-          const __m128i v3 = _mm_add_epi32(u3, k__DCT_CONST_ROUNDING);
-          const __m128i w0 = _mm_srai_epi32(v0, DCT_CONST_BITS);
-          const __m128i w1 = _mm_srai_epi32(v1, DCT_CONST_BITS);
-          const __m128i w2 = _mm_srai_epi32(v2, DCT_CONST_BITS);
-          const __m128i w3 = _mm_srai_epi32(v3, DCT_CONST_BITS);
-          // Combine
-          res11 = _mm_packs_epi32(w0, w1);
-          res03 = _mm_packs_epi32(w2, w3);
-        }
-        {
-          const __m128i t0 = _mm_unpacklo_epi16(step1_0, step1_7);
-          const __m128i t1 = _mm_unpackhi_epi16(step1_0, step1_7);
-          const __m128i t2 = _mm_unpacklo_epi16(step1_1, step1_6);
-          const __m128i t3 = _mm_unpackhi_epi16(step1_1, step1_6);
-          const __m128i u0 = _mm_madd_epi16(t0, k__cospi_m02_p30);
-          const __m128i u1 = _mm_madd_epi16(t1, k__cospi_m02_p30);
-          const __m128i u2 = _mm_madd_epi16(t2, k__cospi_m18_p14);
-          const __m128i u3 = _mm_madd_epi16(t3, k__cospi_m18_p14);
-          // dct_const_round_shift
-          const __m128i v0 = _mm_add_epi32(u0, k__DCT_CONST_ROUNDING);
-          const __m128i v1 = _mm_add_epi32(u1, k__DCT_CONST_ROUNDING);
-          const __m128i v2 = _mm_add_epi32(u2, k__DCT_CONST_ROUNDING);
-          const __m128i v3 = _mm_add_epi32(u3, k__DCT_CONST_ROUNDING);
-          const __m128i w0 = _mm_srai_epi32(v0, DCT_CONST_BITS);
-          const __m128i w1 = _mm_srai_epi32(v1, DCT_CONST_BITS);
-          const __m128i w2 = _mm_srai_epi32(v2, DCT_CONST_BITS);
-          const __m128i w3 = _mm_srai_epi32(v3, DCT_CONST_BITS);
-          // Combine
-          res15 = _mm_packs_epi32(w0, w1);
-          res07 = _mm_packs_epi32(w2, w3);
-        }
-      }
-      // Transpose the results, do it as two 8x8 transposes.
-      {
-        // 00 01 02 03 04 05 06 07
-        // 10 11 12 13 14 15 16 17
-        // 20 21 22 23 24 25 26 27
-        // 30 31 32 33 34 35 36 37
-        // 40 41 42 43 44 45 46 47
-        // 50 51 52 53 54 55 56 57
-        // 60 61 62 63 64 65 66 67
-        // 70 71 72 73 74 75 76 77
-        const __m128i tr0_0 = _mm_unpacklo_epi16(res00, res01);
-        const __m128i tr0_1 = _mm_unpacklo_epi16(res02, res03);
-        const __m128i tr0_2 = _mm_unpackhi_epi16(res00, res01);
-        const __m128i tr0_3 = _mm_unpackhi_epi16(res02, res03);
-        const __m128i tr0_4 = _mm_unpacklo_epi16(res04, res05);
-        const __m128i tr0_5 = _mm_unpacklo_epi16(res06, res07);
-        const __m128i tr0_6 = _mm_unpackhi_epi16(res04, res05);
-        const __m128i tr0_7 = _mm_unpackhi_epi16(res06, res07);
-        // 00 10 01 11 02 12 03 13
-        // 20 30 21 31 22 32 23 33
-        // 04 14 05 15 06 16 07 17
-        // 24 34 25 35 26 36 27 37
-        // 40 50 41 51 42 52 43 53
-        // 60 70 61 71 62 72 63 73
-        // 54 54 55 55 56 56 57 57
-        // 64 74 65 75 66 76 67 77
-        const __m128i tr1_0 = _mm_unpacklo_epi32(tr0_0, tr0_1);
-        const __m128i tr1_1 = _mm_unpacklo_epi32(tr0_2, tr0_3);
-        const __m128i tr1_2 = _mm_unpackhi_epi32(tr0_0, tr0_1);
-        const __m128i tr1_3 = _mm_unpackhi_epi32(tr0_2, tr0_3);
-        const __m128i tr1_4 = _mm_unpacklo_epi32(tr0_4, tr0_5);
-        const __m128i tr1_5 = _mm_unpacklo_epi32(tr0_6, tr0_7);
-        const __m128i tr1_6 = _mm_unpackhi_epi32(tr0_4, tr0_5);
-        const __m128i tr1_7 = _mm_unpackhi_epi32(tr0_6, tr0_7);
-        // 00 10 20 30 01 11 21 31
-        // 40 50 60 70 41 51 61 71
-        // 02 12 22 32 03 13 23 33
-        // 42 52 62 72 43 53 63 73
-        // 04 14 24 34 05 15 21 36
-        // 44 54 64 74 45 55 61 76
-        // 06 16 26 36 07 17 27 37
-        // 46 56 66 76 47 57 67 77
-        const __m128i tr2_0 = _mm_unpacklo_epi64(tr1_0, tr1_4);
-        const __m128i tr2_1 = _mm_unpackhi_epi64(tr1_0, tr1_4);
-        const __m128i tr2_2 = _mm_unpacklo_epi64(tr1_2, tr1_6);
-        const __m128i tr2_3 = _mm_unpackhi_epi64(tr1_2, tr1_6);
-        const __m128i tr2_4 = _mm_unpacklo_epi64(tr1_1, tr1_5);
-        const __m128i tr2_5 = _mm_unpackhi_epi64(tr1_1, tr1_5);
-        const __m128i tr2_6 = _mm_unpacklo_epi64(tr1_3, tr1_7);
-        const __m128i tr2_7 = _mm_unpackhi_epi64(tr1_3, tr1_7);
-        // 00 10 20 30 40 50 60 70
-        // 01 11 21 31 41 51 61 71
-        // 02 12 22 32 42 52 62 72
-        // 03 13 23 33 43 53 63 73
-        // 04 14 24 34 44 54 64 74
-        // 05 15 25 35 45 55 65 75
-        // 06 16 26 36 46 56 66 76
-        // 07 17 27 37 47 57 67 77
-        _mm_storeu_si128((__m128i *)(out + 0 * 16), tr2_0);
-        _mm_storeu_si128((__m128i *)(out + 1 * 16), tr2_1);
-        _mm_storeu_si128((__m128i *)(out + 2 * 16), tr2_2);
-        _mm_storeu_si128((__m128i *)(out + 3 * 16), tr2_3);
-        _mm_storeu_si128((__m128i *)(out + 4 * 16), tr2_4);
-        _mm_storeu_si128((__m128i *)(out + 5 * 16), tr2_5);
-        _mm_storeu_si128((__m128i *)(out + 6 * 16), tr2_6);
-        _mm_storeu_si128((__m128i *)(out + 7 * 16), tr2_7);
-      }
-      {
-        // 00 01 02 03 04 05 06 07
-        // 10 11 12 13 14 15 16 17
-        // 20 21 22 23 24 25 26 27
-        // 30 31 32 33 34 35 36 37
-        // 40 41 42 43 44 45 46 47
-        // 50 51 52 53 54 55 56 57
-        // 60 61 62 63 64 65 66 67
-        // 70 71 72 73 74 75 76 77
-        const __m128i tr0_0 = _mm_unpacklo_epi16(res08, res09);
-        const __m128i tr0_1 = _mm_unpacklo_epi16(res10, res11);
-        const __m128i tr0_2 = _mm_unpackhi_epi16(res08, res09);
-        const __m128i tr0_3 = _mm_unpackhi_epi16(res10, res11);
-        const __m128i tr0_4 = _mm_unpacklo_epi16(res12, res13);
-        const __m128i tr0_5 = _mm_unpacklo_epi16(res14, res15);
-        const __m128i tr0_6 = _mm_unpackhi_epi16(res12, res13);
-        const __m128i tr0_7 = _mm_unpackhi_epi16(res14, res15);
-        // 00 10 01 11 02 12 03 13
-        // 20 30 21 31 22 32 23 33
-        // 04 14 05 15 06 16 07 17
-        // 24 34 25 35 26 36 27 37
-        // 40 50 41 51 42 52 43 53
-        // 60 70 61 71 62 72 63 73
-        // 54 54 55 55 56 56 57 57
-        // 64 74 65 75 66 76 67 77
-        const __m128i tr1_0 = _mm_unpacklo_epi32(tr0_0, tr0_1);
-        const __m128i tr1_1 = _mm_unpacklo_epi32(tr0_2, tr0_3);
-        const __m128i tr1_2 = _mm_unpackhi_epi32(tr0_0, tr0_1);
-        const __m128i tr1_3 = _mm_unpackhi_epi32(tr0_2, tr0_3);
-        const __m128i tr1_4 = _mm_unpacklo_epi32(tr0_4, tr0_5);
-        const __m128i tr1_5 = _mm_unpacklo_epi32(tr0_6, tr0_7);
-        const __m128i tr1_6 = _mm_unpackhi_epi32(tr0_4, tr0_5);
-        const __m128i tr1_7 = _mm_unpackhi_epi32(tr0_6, tr0_7);
-        // 00 10 20 30 01 11 21 31
-        // 40 50 60 70 41 51 61 71
-        // 02 12 22 32 03 13 23 33
-        // 42 52 62 72 43 53 63 73
-        // 04 14 24 34 05 15 21 36
-        // 44 54 64 74 45 55 61 76
-        // 06 16 26 36 07 17 27 37
-        // 46 56 66 76 47 57 67 77
-        const __m128i tr2_0 = _mm_unpacklo_epi64(tr1_0, tr1_4);
-        const __m128i tr2_1 = _mm_unpackhi_epi64(tr1_0, tr1_4);
-        const __m128i tr2_2 = _mm_unpacklo_epi64(tr1_2, tr1_6);
-        const __m128i tr2_3 = _mm_unpackhi_epi64(tr1_2, tr1_6);
-        const __m128i tr2_4 = _mm_unpacklo_epi64(tr1_1, tr1_5);
-        const __m128i tr2_5 = _mm_unpackhi_epi64(tr1_1, tr1_5);
-        const __m128i tr2_6 = _mm_unpacklo_epi64(tr1_3, tr1_7);
-        const __m128i tr2_7 = _mm_unpackhi_epi64(tr1_3, tr1_7);
-        // 00 10 20 30 40 50 60 70
-        // 01 11 21 31 41 51 61 71
-        // 02 12 22 32 42 52 62 72
-        // 03 13 23 33 43 53 63 73
-        // 04 14 24 34 44 54 64 74
-        // 05 15 25 35 45 55 65 75
-        // 06 16 26 36 46 56 66 76
-        // 07 17 27 37 47 57 67 77
-        // Store results
-        _mm_store_si128((__m128i *)(out + 8 + 0 * 16), tr2_0);
-        _mm_store_si128((__m128i *)(out + 8 + 1 * 16), tr2_1);
-        _mm_store_si128((__m128i *)(out + 8 + 2 * 16), tr2_2);
-        _mm_store_si128((__m128i *)(out + 8 + 3 * 16), tr2_3);
-        _mm_store_si128((__m128i *)(out + 8 + 4 * 16), tr2_4);
-        _mm_store_si128((__m128i *)(out + 8 + 5 * 16), tr2_5);
-        _mm_store_si128((__m128i *)(out + 8 + 6 * 16), tr2_6);
-        _mm_store_si128((__m128i *)(out + 8 + 7 * 16), tr2_7);
-      }
-      out += 8*16;
-    }
-    // Setup in/out for next pass.
-    in = intermediate;
-    out = output;
-  }
-}
-
-static INLINE void load_buffer_16x16_avx2(const int16_t* input, __m128i *in0,
-                                     __m128i *in1, int stride) {
-  // load first 8 columns
-  load_buffer_8x8_avx2(input, in0, stride);
-  load_buffer_8x8_avx2(input + 8 * stride, in0 + 8, stride);
-
-  input += 8;
-  // load second 8 columns
-  load_buffer_8x8_avx2(input, in1, stride);
-  load_buffer_8x8_avx2(input + 8 * stride, in1 + 8, stride);
-}
-
-static INLINE void write_buffer_16x16_avx2(int16_t *output, __m128i *in0,
-                                      __m128i *in1, int stride) {
-  // write first 8 columns
-  write_buffer_8x8_avx2(output, in0, stride);
-  write_buffer_8x8_avx2(output + 8 * stride, in0 + 8, stride);
-  // write second 8 columns
-  output += 8;
-  write_buffer_8x8_avx2(output, in1, stride);
-  write_buffer_8x8_avx2(output + 8 * stride, in1 + 8, stride);
-}
-
-static INLINE void array_transpose_16x16_avx2(__m128i *res0, __m128i *res1) {
-  __m128i tbuf[8];
-  array_transpose_8x8_avx2(res0, res0);
-  array_transpose_8x8_avx2(res1, tbuf);
-  array_transpose_8x8_avx2(res0 + 8, res1);
-  array_transpose_8x8_avx2(res1 + 8, res1 + 8);
-
-  res0[8] = tbuf[0];
-  res0[9] = tbuf[1];
-  res0[10] = tbuf[2];
-  res0[11] = tbuf[3];
-  res0[12] = tbuf[4];
-  res0[13] = tbuf[5];
-  res0[14] = tbuf[6];
-  res0[15] = tbuf[7];
-}
-
-static INLINE void right_shift_16x16_avx2(__m128i *res0, __m128i *res1) {
-  // perform rounding operations
-  right_shift_8x8_avx2(res0, 2);
-  right_shift_8x8_avx2(res0 + 8, 2);
-  right_shift_8x8_avx2(res1, 2);
-  right_shift_8x8_avx2(res1 + 8, 2);
-}
-
-void fdct16_8col_avx2(__m128i *in) {
-  // perform 16x16 1-D DCT for 8 columns
-  __m128i i[8], s[8], p[8], t[8], u[16], v[16];
-  const __m128i k__cospi_p16_p16 = _mm_set1_epi16(cospi_16_64);
-  const __m128i k__cospi_p16_m16 = pair_set_epi16(cospi_16_64, -cospi_16_64);
-  const __m128i k__cospi_m16_p16 = pair_set_epi16(-cospi_16_64, cospi_16_64);
-  const __m128i k__cospi_p24_p08 = pair_set_epi16(cospi_24_64, cospi_8_64);
-  const __m128i k__cospi_m24_m08 = pair_set_epi16(-cospi_24_64, -cospi_8_64);
-  const __m128i k__cospi_m08_p24 = pair_set_epi16(-cospi_8_64, cospi_24_64);
-  const __m128i k__cospi_p28_p04 = pair_set_epi16(cospi_28_64, cospi_4_64);
-  const __m128i k__cospi_m04_p28 = pair_set_epi16(-cospi_4_64, cospi_28_64);
-  const __m128i k__cospi_p12_p20 = pair_set_epi16(cospi_12_64, cospi_20_64);
-  const __m128i k__cospi_m20_p12 = pair_set_epi16(-cospi_20_64, cospi_12_64);
-  const __m128i k__cospi_p30_p02 = pair_set_epi16(cospi_30_64, cospi_2_64);
-  const __m128i k__cospi_p14_p18 = pair_set_epi16(cospi_14_64, cospi_18_64);
-  const __m128i k__cospi_m02_p30 = pair_set_epi16(-cospi_2_64, cospi_30_64);
-  const __m128i k__cospi_m18_p14 = pair_set_epi16(-cospi_18_64, cospi_14_64);
-  const __m128i k__cospi_p22_p10 = pair_set_epi16(cospi_22_64, cospi_10_64);
-  const __m128i k__cospi_p06_p26 = pair_set_epi16(cospi_6_64, cospi_26_64);
-  const __m128i k__cospi_m10_p22 = pair_set_epi16(-cospi_10_64, cospi_22_64);
-  const __m128i k__cospi_m26_p06 = pair_set_epi16(-cospi_26_64, cospi_6_64);
-  const __m128i k__DCT_CONST_ROUNDING = _mm_set1_epi32(DCT_CONST_ROUNDING);
-
-  // stage 1
-  i[0] = _mm_add_epi16(in[0], in[15]);
-  i[1] = _mm_add_epi16(in[1], in[14]);
-  i[2] = _mm_add_epi16(in[2], in[13]);
-  i[3] = _mm_add_epi16(in[3], in[12]);
-  i[4] = _mm_add_epi16(in[4], in[11]);
-  i[5] = _mm_add_epi16(in[5], in[10]);
-  i[6] = _mm_add_epi16(in[6], in[9]);
-  i[7] = _mm_add_epi16(in[7], in[8]);
-
-  s[0] = _mm_sub_epi16(in[7], in[8]);
-  s[1] = _mm_sub_epi16(in[6], in[9]);
-  s[2] = _mm_sub_epi16(in[5], in[10]);
-  s[3] = _mm_sub_epi16(in[4], in[11]);
-  s[4] = _mm_sub_epi16(in[3], in[12]);
-  s[5] = _mm_sub_epi16(in[2], in[13]);
-  s[6] = _mm_sub_epi16(in[1], in[14]);
-  s[7] = _mm_sub_epi16(in[0], in[15]);
-
-  p[0] = _mm_add_epi16(i[0], i[7]);
-  p[1] = _mm_add_epi16(i[1], i[6]);
-  p[2] = _mm_add_epi16(i[2], i[5]);
-  p[3] = _mm_add_epi16(i[3], i[4]);
-  p[4] = _mm_sub_epi16(i[3], i[4]);
-  p[5] = _mm_sub_epi16(i[2], i[5]);
-  p[6] = _mm_sub_epi16(i[1], i[6]);
-  p[7] = _mm_sub_epi16(i[0], i[7]);
-
-  u[0] = _mm_add_epi16(p[0], p[3]);
-  u[1] = _mm_add_epi16(p[1], p[2]);
-  u[2] = _mm_sub_epi16(p[1], p[2]);
-  u[3] = _mm_sub_epi16(p[0], p[3]);
-
-  v[0] = _mm_unpacklo_epi16(u[0], u[1]);
-  v[1] = _mm_unpackhi_epi16(u[0], u[1]);
-  v[2] = _mm_unpacklo_epi16(u[2], u[3]);
-  v[3] = _mm_unpackhi_epi16(u[2], u[3]);
-
-  u[0] = _mm_madd_epi16(v[0], k__cospi_p16_p16);
-  u[1] = _mm_madd_epi16(v[1], k__cospi_p16_p16);
-  u[2] = _mm_madd_epi16(v[0], k__cospi_p16_m16);
-  u[3] = _mm_madd_epi16(v[1], k__cospi_p16_m16);
-  u[4] = _mm_madd_epi16(v[2], k__cospi_p24_p08);
-  u[5] = _mm_madd_epi16(v[3], k__cospi_p24_p08);
-  u[6] = _mm_madd_epi16(v[2], k__cospi_m08_p24);
-  u[7] = _mm_madd_epi16(v[3], k__cospi_m08_p24);
-
-  v[0] = _mm_add_epi32(u[0], k__DCT_CONST_ROUNDING);
-  v[1] = _mm_add_epi32(u[1], k__DCT_CONST_ROUNDING);
-  v[2] = _mm_add_epi32(u[2], k__DCT_CONST_ROUNDING);
-  v[3] = _mm_add_epi32(u[3], k__DCT_CONST_ROUNDING);
-  v[4] = _mm_add_epi32(u[4], k__DCT_CONST_ROUNDING);
-  v[5] = _mm_add_epi32(u[5], k__DCT_CONST_ROUNDING);
-  v[6] = _mm_add_epi32(u[6], k__DCT_CONST_ROUNDING);
-  v[7] = _mm_add_epi32(u[7], k__DCT_CONST_ROUNDING);
-
-  u[0] = _mm_srai_epi32(v[0], DCT_CONST_BITS);
-  u[1] = _mm_srai_epi32(v[1], DCT_CONST_BITS);
-  u[2] = _mm_srai_epi32(v[2], DCT_CONST_BITS);
-  u[3] = _mm_srai_epi32(v[3], DCT_CONST_BITS);
-  u[4] = _mm_srai_epi32(v[4], DCT_CONST_BITS);
-  u[5] = _mm_srai_epi32(v[5], DCT_CONST_BITS);
-  u[6] = _mm_srai_epi32(v[6], DCT_CONST_BITS);
-  u[7] = _mm_srai_epi32(v[7], DCT_CONST_BITS);
-
-  in[0] = _mm_packs_epi32(u[0], u[1]);
-  in[4] = _mm_packs_epi32(u[4], u[5]);
-  in[8] = _mm_packs_epi32(u[2], u[3]);
-  in[12] = _mm_packs_epi32(u[6], u[7]);
-
-  u[0] = _mm_unpacklo_epi16(p[5], p[6]);
-  u[1] = _mm_unpackhi_epi16(p[5], p[6]);
-  v[0] = _mm_madd_epi16(u[0], k__cospi_m16_p16);
-  v[1] = _mm_madd_epi16(u[1], k__cospi_m16_p16);
-  v[2] = _mm_madd_epi16(u[0], k__cospi_p16_p16);
-  v[3] = _mm_madd_epi16(u[1], k__cospi_p16_p16);
-
-  u[0] = _mm_add_epi32(v[0], k__DCT_CONST_ROUNDING);
-  u[1] = _mm_add_epi32(v[1], k__DCT_CONST_ROUNDING);
-  u[2] = _mm_add_epi32(v[2], k__DCT_CONST_ROUNDING);
-  u[3] = _mm_add_epi32(v[3], k__DCT_CONST_ROUNDING);
-
-  v[0] = _mm_srai_epi32(u[0], DCT_CONST_BITS);
-  v[1] = _mm_srai_epi32(u[1], DCT_CONST_BITS);
-  v[2] = _mm_srai_epi32(u[2], DCT_CONST_BITS);
-  v[3] = _mm_srai_epi32(u[3], DCT_CONST_BITS);
-
-  u[0] = _mm_packs_epi32(v[0], v[1]);
-  u[1] = _mm_packs_epi32(v[2], v[3]);
-
-  t[0] = _mm_add_epi16(p[4], u[0]);
-  t[1] = _mm_sub_epi16(p[4], u[0]);
-  t[2] = _mm_sub_epi16(p[7], u[1]);
-  t[3] = _mm_add_epi16(p[7], u[1]);
-
-  u[0] = _mm_unpacklo_epi16(t[0], t[3]);
-  u[1] = _mm_unpackhi_epi16(t[0], t[3]);
-  u[2] = _mm_unpacklo_epi16(t[1], t[2]);
-  u[3] = _mm_unpackhi_epi16(t[1], t[2]);
-
-  v[0] = _mm_madd_epi16(u[0], k__cospi_p28_p04);
-  v[1] = _mm_madd_epi16(u[1], k__cospi_p28_p04);
-  v[2] = _mm_madd_epi16(u[2], k__cospi_p12_p20);
-  v[3] = _mm_madd_epi16(u[3], k__cospi_p12_p20);
-  v[4] = _mm_madd_epi16(u[2], k__cospi_m20_p12);
-  v[5] = _mm_madd_epi16(u[3], k__cospi_m20_p12);
-  v[6] = _mm_madd_epi16(u[0], k__cospi_m04_p28);
-  v[7] = _mm_madd_epi16(u[1], k__cospi_m04_p28);
-
-  u[0] = _mm_add_epi32(v[0], k__DCT_CONST_ROUNDING);
-  u[1] = _mm_add_epi32(v[1], k__DCT_CONST_ROUNDING);
-  u[2] = _mm_add_epi32(v[2], k__DCT_CONST_ROUNDING);
-  u[3] = _mm_add_epi32(v[3], k__DCT_CONST_ROUNDING);
-  u[4] = _mm_add_epi32(v[4], k__DCT_CONST_ROUNDING);
-  u[5] = _mm_add_epi32(v[5], k__DCT_CONST_ROUNDING);
-  u[6] = _mm_add_epi32(v[6], k__DCT_CONST_ROUNDING);
-  u[7] = _mm_add_epi32(v[7], k__DCT_CONST_ROUNDING);
-
-  v[0] = _mm_srai_epi32(u[0], DCT_CONST_BITS);
-  v[1] = _mm_srai_epi32(u[1], DCT_CONST_BITS);
-  v[2] = _mm_srai_epi32(u[2], DCT_CONST_BITS);
-  v[3] = _mm_srai_epi32(u[3], DCT_CONST_BITS);
-  v[4] = _mm_srai_epi32(u[4], DCT_CONST_BITS);
-  v[5] = _mm_srai_epi32(u[5], DCT_CONST_BITS);
-  v[6] = _mm_srai_epi32(u[6], DCT_CONST_BITS);
-  v[7] = _mm_srai_epi32(u[7], DCT_CONST_BITS);
-
-  in[2] = _mm_packs_epi32(v[0], v[1]);
-  in[6] = _mm_packs_epi32(v[4], v[5]);
-  in[10] = _mm_packs_epi32(v[2], v[3]);
-  in[14] = _mm_packs_epi32(v[6], v[7]);
-
-  // stage 2
-  u[0] = _mm_unpacklo_epi16(s[2], s[5]);
-  u[1] = _mm_unpackhi_epi16(s[2], s[5]);
-  u[2] = _mm_unpacklo_epi16(s[3], s[4]);
-  u[3] = _mm_unpackhi_epi16(s[3], s[4]);
-
-  v[0] = _mm_madd_epi16(u[0], k__cospi_m16_p16);
-  v[1] = _mm_madd_epi16(u[1], k__cospi_m16_p16);
-  v[2] = _mm_madd_epi16(u[2], k__cospi_m16_p16);
-  v[3] = _mm_madd_epi16(u[3], k__cospi_m16_p16);
-  v[4] = _mm_madd_epi16(u[2], k__cospi_p16_p16);
-  v[5] = _mm_madd_epi16(u[3], k__cospi_p16_p16);
-  v[6] = _mm_madd_epi16(u[0], k__cospi_p16_p16);
-  v[7] = _mm_madd_epi16(u[1], k__cospi_p16_p16);
-
-  u[0] = _mm_add_epi32(v[0], k__DCT_CONST_ROUNDING);
-  u[1] = _mm_add_epi32(v[1], k__DCT_CONST_ROUNDING);
-  u[2] = _mm_add_epi32(v[2], k__DCT_CONST_ROUNDING);
-  u[3] = _mm_add_epi32(v[3], k__DCT_CONST_ROUNDING);
-  u[4] = _mm_add_epi32(v[4], k__DCT_CONST_ROUNDING);
-  u[5] = _mm_add_epi32(v[5], k__DCT_CONST_ROUNDING);
-  u[6] = _mm_add_epi32(v[6], k__DCT_CONST_ROUNDING);
-  u[7] = _mm_add_epi32(v[7], k__DCT_CONST_ROUNDING);
-
-  v[0] = _mm_srai_epi32(u[0], DCT_CONST_BITS);
-  v[1] = _mm_srai_epi32(u[1], DCT_CONST_BITS);
-  v[2] = _mm_srai_epi32(u[2], DCT_CONST_BITS);
-  v[3] = _mm_srai_epi32(u[3], DCT_CONST_BITS);
-  v[4] = _mm_srai_epi32(u[4], DCT_CONST_BITS);
-  v[5] = _mm_srai_epi32(u[5], DCT_CONST_BITS);
-  v[6] = _mm_srai_epi32(u[6], DCT_CONST_BITS);
-  v[7] = _mm_srai_epi32(u[7], DCT_CONST_BITS);
-
-  t[2] = _mm_packs_epi32(v[0], v[1]);
-  t[3] = _mm_packs_epi32(v[2], v[3]);
-  t[4] = _mm_packs_epi32(v[4], v[5]);
-  t[5] = _mm_packs_epi32(v[6], v[7]);
-
-  // stage 3
-  p[0] = _mm_add_epi16(s[0], t[3]);
-  p[1] = _mm_add_epi16(s[1], t[2]);
-  p[2] = _mm_sub_epi16(s[1], t[2]);
-  p[3] = _mm_sub_epi16(s[0], t[3]);
-  p[4] = _mm_sub_epi16(s[7], t[4]);
-  p[5] = _mm_sub_epi16(s[6], t[5]);
-  p[6] = _mm_add_epi16(s[6], t[5]);
-  p[7] = _mm_add_epi16(s[7], t[4]);
-
-  // stage 4
-  u[0] = _mm_unpacklo_epi16(p[1], p[6]);
-  u[1] = _mm_unpackhi_epi16(p[1], p[6]);
-  u[2] = _mm_unpacklo_epi16(p[2], p[5]);
-  u[3] = _mm_unpackhi_epi16(p[2], p[5]);
-
-  v[0] = _mm_madd_epi16(u[0], k__cospi_m08_p24);
-  v[1] = _mm_madd_epi16(u[1], k__cospi_m08_p24);
-  v[2] = _mm_madd_epi16(u[2], k__cospi_m24_m08);
-  v[3] = _mm_madd_epi16(u[3], k__cospi_m24_m08);
-  v[4] = _mm_madd_epi16(u[2], k__cospi_m08_p24);
-  v[5] = _mm_madd_epi16(u[3], k__cospi_m08_p24);
-  v[6] = _mm_madd_epi16(u[0], k__cospi_p24_p08);
-  v[7] = _mm_madd_epi16(u[1], k__cospi_p24_p08);
-
-  u[0] = _mm_add_epi32(v[0], k__DCT_CONST_ROUNDING);
-  u[1] = _mm_add_epi32(v[1], k__DCT_CONST_ROUNDING);
-  u[2] = _mm_add_epi32(v[2], k__DCT_CONST_ROUNDING);
-  u[3] = _mm_add_epi32(v[3], k__DCT_CONST_ROUNDING);
-  u[4] = _mm_add_epi32(v[4], k__DCT_CONST_ROUNDING);
-  u[5] = _mm_add_epi32(v[5], k__DCT_CONST_ROUNDING);
-  u[6] = _mm_add_epi32(v[6], k__DCT_CONST_ROUNDING);
-  u[7] = _mm_add_epi32(v[7], k__DCT_CONST_ROUNDING);
-
-  v[0] = _mm_srai_epi32(u[0], DCT_CONST_BITS);
-  v[1] = _mm_srai_epi32(u[1], DCT_CONST_BITS);
-  v[2] = _mm_srai_epi32(u[2], DCT_CONST_BITS);
-  v[3] = _mm_srai_epi32(u[3], DCT_CONST_BITS);
-  v[4] = _mm_srai_epi32(u[4], DCT_CONST_BITS);
-  v[5] = _mm_srai_epi32(u[5], DCT_CONST_BITS);
-  v[6] = _mm_srai_epi32(u[6], DCT_CONST_BITS);
-  v[7] = _mm_srai_epi32(u[7], DCT_CONST_BITS);
-
-  t[1] = _mm_packs_epi32(v[0], v[1]);
-  t[2] = _mm_packs_epi32(v[2], v[3]);
-  t[5] = _mm_packs_epi32(v[4], v[5]);
-  t[6] = _mm_packs_epi32(v[6], v[7]);
-
-  // stage 5
-  s[0] = _mm_add_epi16(p[0], t[1]);
-  s[1] = _mm_sub_epi16(p[0], t[1]);
-  s[2] = _mm_sub_epi16(p[3], t[2]);
-  s[3] = _mm_add_epi16(p[3], t[2]);
-  s[4] = _mm_add_epi16(p[4], t[5]);
-  s[5] = _mm_sub_epi16(p[4], t[5]);
-  s[6] = _mm_sub_epi16(p[7], t[6]);
-  s[7] = _mm_add_epi16(p[7], t[6]);
-
-  // stage 6
-  u[0] = _mm_unpacklo_epi16(s[0], s[7]);
-  u[1] = _mm_unpackhi_epi16(s[0], s[7]);
-  u[2] = _mm_unpacklo_epi16(s[1], s[6]);
-  u[3] = _mm_unpackhi_epi16(s[1], s[6]);
-  u[4] = _mm_unpacklo_epi16(s[2], s[5]);
-  u[5] = _mm_unpackhi_epi16(s[2], s[5]);
-  u[6] = _mm_unpacklo_epi16(s[3], s[4]);
-  u[7] = _mm_unpackhi_epi16(s[3], s[4]);
-
-  v[0] = _mm_madd_epi16(u[0], k__cospi_p30_p02);
-  v[1] = _mm_madd_epi16(u[1], k__cospi_p30_p02);
-  v[2] = _mm_madd_epi16(u[2], k__cospi_p14_p18);
-  v[3] = _mm_madd_epi16(u[3], k__cospi_p14_p18);
-  v[4] = _mm_madd_epi16(u[4], k__cospi_p22_p10);
-  v[5] = _mm_madd_epi16(u[5], k__cospi_p22_p10);
-  v[6] = _mm_madd_epi16(u[6], k__cospi_p06_p26);
-  v[7] = _mm_madd_epi16(u[7], k__cospi_p06_p26);
-  v[8] = _mm_madd_epi16(u[6], k__cospi_m26_p06);
-  v[9] = _mm_madd_epi16(u[7], k__cospi_m26_p06);
-  v[10] = _mm_madd_epi16(u[4], k__cospi_m10_p22);
-  v[11] = _mm_madd_epi16(u[5], k__cospi_m10_p22);
-  v[12] = _mm_madd_epi16(u[2], k__cospi_m18_p14);
-  v[13] = _mm_madd_epi16(u[3], k__cospi_m18_p14);
-  v[14] = _mm_madd_epi16(u[0], k__cospi_m02_p30);
-  v[15] = _mm_madd_epi16(u[1], k__cospi_m02_p30);
-
-  u[0] = _mm_add_epi32(v[0], k__DCT_CONST_ROUNDING);
-  u[1] = _mm_add_epi32(v[1], k__DCT_CONST_ROUNDING);
-  u[2] = _mm_add_epi32(v[2], k__DCT_CONST_ROUNDING);
-  u[3] = _mm_add_epi32(v[3], k__DCT_CONST_ROUNDING);
-  u[4] = _mm_add_epi32(v[4], k__DCT_CONST_ROUNDING);
-  u[5] = _mm_add_epi32(v[5], k__DCT_CONST_ROUNDING);
-  u[6] = _mm_add_epi32(v[6], k__DCT_CONST_ROUNDING);
-  u[7] = _mm_add_epi32(v[7], k__DCT_CONST_ROUNDING);
-  u[8] = _mm_add_epi32(v[8], k__DCT_CONST_ROUNDING);
-  u[9] = _mm_add_epi32(v[9], k__DCT_CONST_ROUNDING);
-  u[10] = _mm_add_epi32(v[10], k__DCT_CONST_ROUNDING);
-  u[11] = _mm_add_epi32(v[11], k__DCT_CONST_ROUNDING);
-  u[12] = _mm_add_epi32(v[12], k__DCT_CONST_ROUNDING);
-  u[13] = _mm_add_epi32(v[13], k__DCT_CONST_ROUNDING);
-  u[14] = _mm_add_epi32(v[14], k__DCT_CONST_ROUNDING);
-  u[15] = _mm_add_epi32(v[15], k__DCT_CONST_ROUNDING);
-
-  v[0] = _mm_srai_epi32(u[0], DCT_CONST_BITS);
-  v[1] = _mm_srai_epi32(u[1], DCT_CONST_BITS);
-  v[2] = _mm_srai_epi32(u[2], DCT_CONST_BITS);
-  v[3] = _mm_srai_epi32(u[3], DCT_CONST_BITS);
-  v[4] = _mm_srai_epi32(u[4], DCT_CONST_BITS);
-  v[5] = _mm_srai_epi32(u[5], DCT_CONST_BITS);
-  v[6] = _mm_srai_epi32(u[6], DCT_CONST_BITS);
-  v[7] = _mm_srai_epi32(u[7], DCT_CONST_BITS);
-  v[8] = _mm_srai_epi32(u[8], DCT_CONST_BITS);
-  v[9] = _mm_srai_epi32(u[9], DCT_CONST_BITS);
-  v[10] = _mm_srai_epi32(u[10], DCT_CONST_BITS);
-  v[11] = _mm_srai_epi32(u[11], DCT_CONST_BITS);
-  v[12] = _mm_srai_epi32(u[12], DCT_CONST_BITS);
-  v[13] = _mm_srai_epi32(u[13], DCT_CONST_BITS);
-  v[14] = _mm_srai_epi32(u[14], DCT_CONST_BITS);
-  v[15] = _mm_srai_epi32(u[15], DCT_CONST_BITS);
-
-  in[1]  = _mm_packs_epi32(v[0], v[1]);
-  in[9]  = _mm_packs_epi32(v[2], v[3]);
-  in[5]  = _mm_packs_epi32(v[4], v[5]);
-  in[13] = _mm_packs_epi32(v[6], v[7]);
-  in[3]  = _mm_packs_epi32(v[8], v[9]);
-  in[11] = _mm_packs_epi32(v[10], v[11]);
-  in[7]  = _mm_packs_epi32(v[12], v[13]);
-  in[15] = _mm_packs_epi32(v[14], v[15]);
-}
-
-void fadst16_8col_avx2(__m128i *in) {
-  // perform 16x16 1-D ADST for 8 columns
-  __m128i s[16], x[16], u[32], v[32];
-  const __m128i k__cospi_p01_p31 = pair_set_epi16(cospi_1_64, cospi_31_64);
-  const __m128i k__cospi_p31_m01 = pair_set_epi16(cospi_31_64, -cospi_1_64);
-  const __m128i k__cospi_p05_p27 = pair_set_epi16(cospi_5_64, cospi_27_64);
-  const __m128i k__cospi_p27_m05 = pair_set_epi16(cospi_27_64, -cospi_5_64);
-  const __m128i k__cospi_p09_p23 = pair_set_epi16(cospi_9_64, cospi_23_64);
-  const __m128i k__cospi_p23_m09 = pair_set_epi16(cospi_23_64, -cospi_9_64);
-  const __m128i k__cospi_p13_p19 = pair_set_epi16(cospi_13_64, cospi_19_64);
-  const __m128i k__cospi_p19_m13 = pair_set_epi16(cospi_19_64, -cospi_13_64);
-  const __m128i k__cospi_p17_p15 = pair_set_epi16(cospi_17_64, cospi_15_64);
-  const __m128i k__cospi_p15_m17 = pair_set_epi16(cospi_15_64, -cospi_17_64);
-  const __m128i k__cospi_p21_p11 = pair_set_epi16(cospi_21_64, cospi_11_64);
-  const __m128i k__cospi_p11_m21 = pair_set_epi16(cospi_11_64, -cospi_21_64);
-  const __m128i k__cospi_p25_p07 = pair_set_epi16(cospi_25_64, cospi_7_64);
-  const __m128i k__cospi_p07_m25 = pair_set_epi16(cospi_7_64, -cospi_25_64);
-  const __m128i k__cospi_p29_p03 = pair_set_epi16(cospi_29_64, cospi_3_64);
-  const __m128i k__cospi_p03_m29 = pair_set_epi16(cospi_3_64, -cospi_29_64);
-  const __m128i k__cospi_p04_p28 = pair_set_epi16(cospi_4_64, cospi_28_64);
-  const __m128i k__cospi_p28_m04 = pair_set_epi16(cospi_28_64, -cospi_4_64);
-  const __m128i k__cospi_p20_p12 = pair_set_epi16(cospi_20_64, cospi_12_64);
-  const __m128i k__cospi_p12_m20 = pair_set_epi16(cospi_12_64, -cospi_20_64);
-  const __m128i k__cospi_m28_p04 = pair_set_epi16(-cospi_28_64, cospi_4_64);
-  const __m128i k__cospi_m12_p20 = pair_set_epi16(-cospi_12_64, cospi_20_64);
-  const __m128i k__cospi_p08_p24 = pair_set_epi16(cospi_8_64, cospi_24_64);
-  const __m128i k__cospi_p24_m08 = pair_set_epi16(cospi_24_64, -cospi_8_64);
-  const __m128i k__cospi_m24_p08 = pair_set_epi16(-cospi_24_64, cospi_8_64);
-  const __m128i k__cospi_m16_m16 = _mm_set1_epi16(-cospi_16_64);
-  const __m128i k__cospi_p16_p16 = _mm_set1_epi16(cospi_16_64);
-  const __m128i k__cospi_p16_m16 = pair_set_epi16(cospi_16_64, -cospi_16_64);
-  const __m128i k__cospi_m16_p16 = pair_set_epi16(-cospi_16_64, cospi_16_64);
-  const __m128i k__DCT_CONST_ROUNDING = _mm_set1_epi32(DCT_CONST_ROUNDING);
-  const __m128i kZero = _mm_set1_epi16(0);
-
-  u[0] = _mm_unpacklo_epi16(in[15], in[0]);
-  u[1] = _mm_unpackhi_epi16(in[15], in[0]);
-  u[2] = _mm_unpacklo_epi16(in[13], in[2]);
-  u[3] = _mm_unpackhi_epi16(in[13], in[2]);
-  u[4] = _mm_unpacklo_epi16(in[11], in[4]);
-  u[5] = _mm_unpackhi_epi16(in[11], in[4]);
-  u[6] = _mm_unpacklo_epi16(in[9], in[6]);
-  u[7] = _mm_unpackhi_epi16(in[9], in[6]);
-  u[8] = _mm_unpacklo_epi16(in[7], in[8]);
-  u[9] = _mm_unpackhi_epi16(in[7], in[8]);
-  u[10] = _mm_unpacklo_epi16(in[5], in[10]);
-  u[11] = _mm_unpackhi_epi16(in[5], in[10]);
-  u[12] = _mm_unpacklo_epi16(in[3], in[12]);
-  u[13] = _mm_unpackhi_epi16(in[3], in[12]);
-  u[14] = _mm_unpacklo_epi16(in[1], in[14]);
-  u[15] = _mm_unpackhi_epi16(in[1], in[14]);
-
-  v[0] = _mm_madd_epi16(u[0], k__cospi_p01_p31);
-  v[1] = _mm_madd_epi16(u[1], k__cospi_p01_p31);
-  v[2] = _mm_madd_epi16(u[0], k__cospi_p31_m01);
-  v[3] = _mm_madd_epi16(u[1], k__cospi_p31_m01);
-  v[4] = _mm_madd_epi16(u[2], k__cospi_p05_p27);
-  v[5] = _mm_madd_epi16(u[3], k__cospi_p05_p27);
-  v[6] = _mm_madd_epi16(u[2], k__cospi_p27_m05);
-  v[7] = _mm_madd_epi16(u[3], k__cospi_p27_m05);
-  v[8] = _mm_madd_epi16(u[4], k__cospi_p09_p23);
-  v[9] = _mm_madd_epi16(u[5], k__cospi_p09_p23);
-  v[10] = _mm_madd_epi16(u[4], k__cospi_p23_m09);
-  v[11] = _mm_madd_epi16(u[5], k__cospi_p23_m09);
-  v[12] = _mm_madd_epi16(u[6], k__cospi_p13_p19);
-  v[13] = _mm_madd_epi16(u[7], k__cospi_p13_p19);
-  v[14] = _mm_madd_epi16(u[6], k__cospi_p19_m13);
-  v[15] = _mm_madd_epi16(u[7], k__cospi_p19_m13);
-  v[16] = _mm_madd_epi16(u[8], k__cospi_p17_p15);
-  v[17] = _mm_madd_epi16(u[9], k__cospi_p17_p15);
-  v[18] = _mm_madd_epi16(u[8], k__cospi_p15_m17);
-  v[19] = _mm_madd_epi16(u[9], k__cospi_p15_m17);
-  v[20] = _mm_madd_epi16(u[10], k__cospi_p21_p11);
-  v[21] = _mm_madd_epi16(u[11], k__cospi_p21_p11);
-  v[22] = _mm_madd_epi16(u[10], k__cospi_p11_m21);
-  v[23] = _mm_madd_epi16(u[11], k__cospi_p11_m21);
-  v[24] = _mm_madd_epi16(u[12], k__cospi_p25_p07);
-  v[25] = _mm_madd_epi16(u[13], k__cospi_p25_p07);
-  v[26] = _mm_madd_epi16(u[12], k__cospi_p07_m25);
-  v[27] = _mm_madd_epi16(u[13], k__cospi_p07_m25);
-  v[28] = _mm_madd_epi16(u[14], k__cospi_p29_p03);
-  v[29] = _mm_madd_epi16(u[15], k__cospi_p29_p03);
-  v[30] = _mm_madd_epi16(u[14], k__cospi_p03_m29);
-  v[31] = _mm_madd_epi16(u[15], k__cospi_p03_m29);
-
-  u[0] = _mm_add_epi32(v[0], v[16]);
-  u[1] = _mm_add_epi32(v[1], v[17]);
-  u[2] = _mm_add_epi32(v[2], v[18]);
-  u[3] = _mm_add_epi32(v[3], v[19]);
-  u[4] = _mm_add_epi32(v[4], v[20]);
-  u[5] = _mm_add_epi32(v[5], v[21]);
-  u[6] = _mm_add_epi32(v[6], v[22]);
-  u[7] = _mm_add_epi32(v[7], v[23]);
-  u[8] = _mm_add_epi32(v[8], v[24]);
-  u[9] = _mm_add_epi32(v[9], v[25]);
-  u[10] = _mm_add_epi32(v[10], v[26]);
-  u[11] = _mm_add_epi32(v[11], v[27]);
-  u[12] = _mm_add_epi32(v[12], v[28]);
-  u[13] = _mm_add_epi32(v[13], v[29]);
-  u[14] = _mm_add_epi32(v[14], v[30]);
-  u[15] = _mm_add_epi32(v[15], v[31]);
-  u[16] = _mm_sub_epi32(v[0], v[16]);
-  u[17] = _mm_sub_epi32(v[1], v[17]);
-  u[18] = _mm_sub_epi32(v[2], v[18]);
-  u[19] = _mm_sub_epi32(v[3], v[19]);
-  u[20] = _mm_sub_epi32(v[4], v[20]);
-  u[21] = _mm_sub_epi32(v[5], v[21]);
-  u[22] = _mm_sub_epi32(v[6], v[22]);
-  u[23] = _mm_sub_epi32(v[7], v[23]);
-  u[24] = _mm_sub_epi32(v[8], v[24]);
-  u[25] = _mm_sub_epi32(v[9], v[25]);
-  u[26] = _mm_sub_epi32(v[10], v[26]);
-  u[27] = _mm_sub_epi32(v[11], v[27]);
-  u[28] = _mm_sub_epi32(v[12], v[28]);
-  u[29] = _mm_sub_epi32(v[13], v[29]);
-  u[30] = _mm_sub_epi32(v[14], v[30]);
-  u[31] = _mm_sub_epi32(v[15], v[31]);
-
-  v[0] = _mm_add_epi32(u[0], k__DCT_CONST_ROUNDING);
-  v[1] = _mm_add_epi32(u[1], k__DCT_CONST_ROUNDING);
-  v[2] = _mm_add_epi32(u[2], k__DCT_CONST_ROUNDING);
-  v[3] = _mm_add_epi32(u[3], k__DCT_CONST_ROUNDING);
-  v[4] = _mm_add_epi32(u[4], k__DCT_CONST_ROUNDING);
-  v[5] = _mm_add_epi32(u[5], k__DCT_CONST_ROUNDING);
-  v[6] = _mm_add_epi32(u[6], k__DCT_CONST_ROUNDING);
-  v[7] = _mm_add_epi32(u[7], k__DCT_CONST_ROUNDING);
-  v[8] = _mm_add_epi32(u[8], k__DCT_CONST_ROUNDING);
-  v[9] = _mm_add_epi32(u[9], k__DCT_CONST_ROUNDING);
-  v[10] = _mm_add_epi32(u[10], k__DCT_CONST_ROUNDING);
-  v[11] = _mm_add_epi32(u[11], k__DCT_CONST_ROUNDING);
-  v[12] = _mm_add_epi32(u[12], k__DCT_CONST_ROUNDING);
-  v[13] = _mm_add_epi32(u[13], k__DCT_CONST_ROUNDING);
-  v[14] = _mm_add_epi32(u[14], k__DCT_CONST_ROUNDING);
-  v[15] = _mm_add_epi32(u[15], k__DCT_CONST_ROUNDING);
-  v[16] = _mm_add_epi32(u[16], k__DCT_CONST_ROUNDING);
-  v[17] = _mm_add_epi32(u[17], k__DCT_CONST_ROUNDING);
-  v[18] = _mm_add_epi32(u[18], k__DCT_CONST_ROUNDING);
-  v[19] = _mm_add_epi32(u[19], k__DCT_CONST_ROUNDING);
-  v[20] = _mm_add_epi32(u[20], k__DCT_CONST_ROUNDING);
-  v[21] = _mm_add_epi32(u[21], k__DCT_CONST_ROUNDING);
-  v[22] = _mm_add_epi32(u[22], k__DCT_CONST_ROUNDING);
-  v[23] = _mm_add_epi32(u[23], k__DCT_CONST_ROUNDING);
-  v[24] = _mm_add_epi32(u[24], k__DCT_CONST_ROUNDING);
-  v[25] = _mm_add_epi32(u[25], k__DCT_CONST_ROUNDING);
-  v[26] = _mm_add_epi32(u[26], k__DCT_CONST_ROUNDING);
-  v[27] = _mm_add_epi32(u[27], k__DCT_CONST_ROUNDING);
-  v[28] = _mm_add_epi32(u[28], k__DCT_CONST_ROUNDING);
-  v[29] = _mm_add_epi32(u[29], k__DCT_CONST_ROUNDING);
-  v[30] = _mm_add_epi32(u[30], k__DCT_CONST_ROUNDING);
-  v[31] = _mm_add_epi32(u[31], k__DCT_CONST_ROUNDING);
-
-  u[0] = _mm_srai_epi32(v[0], DCT_CONST_BITS);
-  u[1] = _mm_srai_epi32(v[1], DCT_CONST_BITS);
-  u[2] = _mm_srai_epi32(v[2], DCT_CONST_BITS);
-  u[3] = _mm_srai_epi32(v[3], DCT_CONST_BITS);
-  u[4] = _mm_srai_epi32(v[4], DCT_CONST_BITS);
-  u[5] = _mm_srai_epi32(v[5], DCT_CONST_BITS);
-  u[6] = _mm_srai_epi32(v[6], DCT_CONST_BITS);
-  u[7] = _mm_srai_epi32(v[7], DCT_CONST_BITS);
-  u[8] = _mm_srai_epi32(v[8], DCT_CONST_BITS);
-  u[9] = _mm_srai_epi32(v[9], DCT_CONST_BITS);
-  u[10] = _mm_srai_epi32(v[10], DCT_CONST_BITS);
-  u[11] = _mm_srai_epi32(v[11], DCT_CONST_BITS);
-  u[12] = _mm_srai_epi32(v[12], DCT_CONST_BITS);
-  u[13] = _mm_srai_epi32(v[13], DCT_CONST_BITS);
-  u[14] = _mm_srai_epi32(v[14], DCT_CONST_BITS);
-  u[15] = _mm_srai_epi32(v[15], DCT_CONST_BITS);
-  u[16] = _mm_srai_epi32(v[16], DCT_CONST_BITS);
-  u[17] = _mm_srai_epi32(v[17], DCT_CONST_BITS);
-  u[18] = _mm_srai_epi32(v[18], DCT_CONST_BITS);
-  u[19] = _mm_srai_epi32(v[19], DCT_CONST_BITS);
-  u[20] = _mm_srai_epi32(v[20], DCT_CONST_BITS);
-  u[21] = _mm_srai_epi32(v[21], DCT_CONST_BITS);
-  u[22] = _mm_srai_epi32(v[22], DCT_CONST_BITS);
-  u[23] = _mm_srai_epi32(v[23], DCT_CONST_BITS);
-  u[24] = _mm_srai_epi32(v[24], DCT_CONST_BITS);
-  u[25] = _mm_srai_epi32(v[25], DCT_CONST_BITS);
-  u[26] = _mm_srai_epi32(v[26], DCT_CONST_BITS);
-  u[27] = _mm_srai_epi32(v[27], DCT_CONST_BITS);
-  u[28] = _mm_srai_epi32(v[28], DCT_CONST_BITS);
-  u[29] = _mm_srai_epi32(v[29], DCT_CONST_BITS);
-  u[30] = _mm_srai_epi32(v[30], DCT_CONST_BITS);
-  u[31] = _mm_srai_epi32(v[31], DCT_CONST_BITS);
-
-  s[0] = _mm_packs_epi32(u[0], u[1]);
-  s[1] = _mm_packs_epi32(u[2], u[3]);
-  s[2] = _mm_packs_epi32(u[4], u[5]);
-  s[3] = _mm_packs_epi32(u[6], u[7]);
-  s[4] = _mm_packs_epi32(u[8], u[9]);
-  s[5] = _mm_packs_epi32(u[10], u[11]);
-  s[6] = _mm_packs_epi32(u[12], u[13]);
-  s[7] = _mm_packs_epi32(u[14], u[15]);
-  s[8] = _mm_packs_epi32(u[16], u[17]);
-  s[9] = _mm_packs_epi32(u[18], u[19]);
-  s[10] = _mm_packs_epi32(u[20], u[21]);
-  s[11] = _mm_packs_epi32(u[22], u[23]);
-  s[12] = _mm_packs_epi32(u[24], u[25]);
-  s[13] = _mm_packs_epi32(u[26], u[27]);
-  s[14] = _mm_packs_epi32(u[28], u[29]);
-  s[15] = _mm_packs_epi32(u[30], u[31]);
-
-  // stage 2
-  u[0] = _mm_unpacklo_epi16(s[8], s[9]);
-  u[1] = _mm_unpackhi_epi16(s[8], s[9]);
-  u[2] = _mm_unpacklo_epi16(s[10], s[11]);
-  u[3] = _mm_unpackhi_epi16(s[10], s[11]);
-  u[4] = _mm_unpacklo_epi16(s[12], s[13]);
-  u[5] = _mm_unpackhi_epi16(s[12], s[13]);
-  u[6] = _mm_unpacklo_epi16(s[14], s[15]);
-  u[7] = _mm_unpackhi_epi16(s[14], s[15]);
-
-  v[0] = _mm_madd_epi16(u[0], k__cospi_p04_p28);
-  v[1] = _mm_madd_epi16(u[1], k__cospi_p04_p28);
-  v[2] = _mm_madd_epi16(u[0], k__cospi_p28_m04);
-  v[3] = _mm_madd_epi16(u[1], k__cospi_p28_m04);
-  v[4] = _mm_madd_epi16(u[2], k__cospi_p20_p12);
-  v[5] = _mm_madd_epi16(u[3], k__cospi_p20_p12);
-  v[6] = _mm_madd_epi16(u[2], k__cospi_p12_m20);
-  v[7] = _mm_madd_epi16(u[3], k__cospi_p12_m20);
-  v[8] = _mm_madd_epi16(u[4], k__cospi_m28_p04);
-  v[9] = _mm_madd_epi16(u[5], k__cospi_m28_p04);
-  v[10] = _mm_madd_epi16(u[4], k__cospi_p04_p28);
-  v[11] = _mm_madd_epi16(u[5], k__cospi_p04_p28);
-  v[12] = _mm_madd_epi16(u[6], k__cospi_m12_p20);
-  v[13] = _mm_madd_epi16(u[7], k__cospi_m12_p20);
-  v[14] = _mm_madd_epi16(u[6], k__cospi_p20_p12);
-  v[15] = _mm_madd_epi16(u[7], k__cospi_p20_p12);
-
-  u[0] = _mm_add_epi32(v[0], v[8]);
-  u[1] = _mm_add_epi32(v[1], v[9]);
-  u[2] = _mm_add_epi32(v[2], v[10]);
-  u[3] = _mm_add_epi32(v[3], v[11]);
-  u[4] = _mm_add_epi32(v[4], v[12]);
-  u[5] = _mm_add_epi32(v[5], v[13]);
-  u[6] = _mm_add_epi32(v[6], v[14]);
-  u[7] = _mm_add_epi32(v[7], v[15]);
-  u[8] = _mm_sub_epi32(v[0], v[8]);
-  u[9] = _mm_sub_epi32(v[1], v[9]);
-  u[10] = _mm_sub_epi32(v[2], v[10]);
-  u[11] = _mm_sub_epi32(v[3], v[11]);
-  u[12] = _mm_sub_epi32(v[4], v[12]);
-  u[13] = _mm_sub_epi32(v[5], v[13]);
-  u[14] = _mm_sub_epi32(v[6], v[14]);
-  u[15] = _mm_sub_epi32(v[7], v[15]);
-
-  v[0] = _mm_add_epi32(u[0], k__DCT_CONST_ROUNDING);
-  v[1] = _mm_add_epi32(u[1], k__DCT_CONST_ROUNDING);
-  v[2] = _mm_add_epi32(u[2], k__DCT_CONST_ROUNDING);
-  v[3] = _mm_add_epi32(u[3], k__DCT_CONST_ROUNDING);
-  v[4] = _mm_add_epi32(u[4], k__DCT_CONST_ROUNDING);
-  v[5] = _mm_add_epi32(u[5], k__DCT_CONST_ROUNDING);
-  v[6] = _mm_add_epi32(u[6], k__DCT_CONST_ROUNDING);
-  v[7] = _mm_add_epi32(u[7], k__DCT_CONST_ROUNDING);
-  v[8] = _mm_add_epi32(u[8], k__DCT_CONST_ROUNDING);
-  v[9] = _mm_add_epi32(u[9], k__DCT_CONST_ROUNDING);
-  v[10] = _mm_add_epi32(u[10], k__DCT_CONST_ROUNDING);
-  v[11] = _mm_add_epi32(u[11], k__DCT_CONST_ROUNDING);
-  v[12] = _mm_add_epi32(u[12], k__DCT_CONST_ROUNDING);
-  v[13] = _mm_add_epi32(u[13], k__DCT_CONST_ROUNDING);
-  v[14] = _mm_add_epi32(u[14], k__DCT_CONST_ROUNDING);
-  v[15] = _mm_add_epi32(u[15], k__DCT_CONST_ROUNDING);
-
-  u[0] = _mm_srai_epi32(v[0], DCT_CONST_BITS);
-  u[1] = _mm_srai_epi32(v[1], DCT_CONST_BITS);
-  u[2] = _mm_srai_epi32(v[2], DCT_CONST_BITS);
-  u[3] = _mm_srai_epi32(v[3], DCT_CONST_BITS);
-  u[4] = _mm_srai_epi32(v[4], DCT_CONST_BITS);
-  u[5] = _mm_srai_epi32(v[5], DCT_CONST_BITS);
-  u[6] = _mm_srai_epi32(v[6], DCT_CONST_BITS);
-  u[7] = _mm_srai_epi32(v[7], DCT_CONST_BITS);
-  u[8] = _mm_srai_epi32(v[8], DCT_CONST_BITS);
-  u[9] = _mm_srai_epi32(v[9], DCT_CONST_BITS);
-  u[10] = _mm_srai_epi32(v[10], DCT_CONST_BITS);
-  u[11] = _mm_srai_epi32(v[11], DCT_CONST_BITS);
-  u[12] = _mm_srai_epi32(v[12], DCT_CONST_BITS);
-  u[13] = _mm_srai_epi32(v[13], DCT_CONST_BITS);
-  u[14] = _mm_srai_epi32(v[14], DCT_CONST_BITS);
-  u[15] = _mm_srai_epi32(v[15], DCT_CONST_BITS);
-
-  x[0] = _mm_add_epi16(s[0], s[4]);
-  x[1] = _mm_add_epi16(s[1], s[5]);
-  x[2] = _mm_add_epi16(s[2], s[6]);
-  x[3] = _mm_add_epi16(s[3], s[7]);
-  x[4] = _mm_sub_epi16(s[0], s[4]);
-  x[5] = _mm_sub_epi16(s[1], s[5]);
-  x[6] = _mm_sub_epi16(s[2], s[6]);
-  x[7] = _mm_sub_epi16(s[3], s[7]);
-  x[8] = _mm_packs_epi32(u[0], u[1]);
-  x[9] = _mm_packs_epi32(u[2], u[3]);
-  x[10] = _mm_packs_epi32(u[4], u[5]);
-  x[11] = _mm_packs_epi32(u[6], u[7]);
-  x[12] = _mm_packs_epi32(u[8], u[9]);
-  x[13] = _mm_packs_epi32(u[10], u[11]);
-  x[14] = _mm_packs_epi32(u[12], u[13]);
-  x[15] = _mm_packs_epi32(u[14], u[15]);
-
-  // stage 3
-  u[0] = _mm_unpacklo_epi16(x[4], x[5]);
-  u[1] = _mm_unpackhi_epi16(x[4], x[5]);
-  u[2] = _mm_unpacklo_epi16(x[6], x[7]);
-  u[3] = _mm_unpackhi_epi16(x[6], x[7]);
-  u[4] = _mm_unpacklo_epi16(x[12], x[13]);
-  u[5] = _mm_unpackhi_epi16(x[12], x[13]);
-  u[6] = _mm_unpacklo_epi16(x[14], x[15]);
-  u[7] = _mm_unpackhi_epi16(x[14], x[15]);
-
-  v[0] = _mm_madd_epi16(u[0], k__cospi_p08_p24);
-  v[1] = _mm_madd_epi16(u[1], k__cospi_p08_p24);
-  v[2] = _mm_madd_epi16(u[0], k__cospi_p24_m08);
-  v[3] = _mm_madd_epi16(u[1], k__cospi_p24_m08);
-  v[4] = _mm_madd_epi16(u[2], k__cospi_m24_p08);
-  v[5] = _mm_madd_epi16(u[3], k__cospi_m24_p08);
-  v[6] = _mm_madd_epi16(u[2], k__cospi_p08_p24);
-  v[7] = _mm_madd_epi16(u[3], k__cospi_p08_p24);
-  v[8] = _mm_madd_epi16(u[4], k__cospi_p08_p24);
-  v[9] = _mm_madd_epi16(u[5], k__cospi_p08_p24);
-  v[10] = _mm_madd_epi16(u[4], k__cospi_p24_m08);
-  v[11] = _mm_madd_epi16(u[5], k__cospi_p24_m08);
-  v[12] = _mm_madd_epi16(u[6], k__cospi_m24_p08);
-  v[13] = _mm_madd_epi16(u[7], k__cospi_m24_p08);
-  v[14] = _mm_madd_epi16(u[6], k__cospi_p08_p24);
-  v[15] = _mm_madd_epi16(u[7], k__cospi_p08_p24);
-
-  u[0] = _mm_add_epi32(v[0], v[4]);
-  u[1] = _mm_add_epi32(v[1], v[5]);
-  u[2] = _mm_add_epi32(v[2], v[6]);
-  u[3] = _mm_add_epi32(v[3], v[7]);
-  u[4] = _mm_sub_epi32(v[0], v[4]);
-  u[5] = _mm_sub_epi32(v[1], v[5]);
-  u[6] = _mm_sub_epi32(v[2], v[6]);
-  u[7] = _mm_sub_epi32(v[3], v[7]);
-  u[8] = _mm_add_epi32(v[8], v[12]);
-  u[9] = _mm_add_epi32(v[9], v[13]);
-  u[10] = _mm_add_epi32(v[10], v[14]);
-  u[11] = _mm_add_epi32(v[11], v[15]);
-  u[12] = _mm_sub_epi32(v[8], v[12]);
-  u[13] = _mm_sub_epi32(v[9], v[13]);
-  u[14] = _mm_sub_epi32(v[10], v[14]);
-  u[15] = _mm_sub_epi32(v[11], v[15]);
-
-  u[0] = _mm_add_epi32(u[0], k__DCT_CONST_ROUNDING);
-  u[1] = _mm_add_epi32(u[1], k__DCT_CONST_ROUNDING);
-  u[2] = _mm_add_epi32(u[2], k__DCT_CONST_ROUNDING);
-  u[3] = _mm_add_epi32(u[3], k__DCT_CONST_ROUNDING);
-  u[4] = _mm_add_epi32(u[4], k__DCT_CONST_ROUNDING);
-  u[5] = _mm_add_epi32(u[5], k__DCT_CONST_ROUNDING);
-  u[6] = _mm_add_epi32(u[6], k__DCT_CONST_ROUNDING);
-  u[7] = _mm_add_epi32(u[7], k__DCT_CONST_ROUNDING);
-  u[8] = _mm_add_epi32(u[8], k__DCT_CONST_ROUNDING);
-  u[9] = _mm_add_epi32(u[9], k__DCT_CONST_ROUNDING);
-  u[10] = _mm_add_epi32(u[10], k__DCT_CONST_ROUNDING);
-  u[11] = _mm_add_epi32(u[11], k__DCT_CONST_ROUNDING);
-  u[12] = _mm_add_epi32(u[12], k__DCT_CONST_ROUNDING);
-  u[13] = _mm_add_epi32(u[13], k__DCT_CONST_ROUNDING);
-  u[14] = _mm_add_epi32(u[14], k__DCT_CONST_ROUNDING);
-  u[15] = _mm_add_epi32(u[15], k__DCT_CONST_ROUNDING);
-
-  v[0] = _mm_srai_epi32(u[0], DCT_CONST_BITS);
-  v[1] = _mm_srai_epi32(u[1], DCT_CONST_BITS);
-  v[2] = _mm_srai_epi32(u[2], DCT_CONST_BITS);
-  v[3] = _mm_srai_epi32(u[3], DCT_CONST_BITS);
-  v[4] = _mm_srai_epi32(u[4], DCT_CONST_BITS);
-  v[5] = _mm_srai_epi32(u[5], DCT_CONST_BITS);
-  v[6] = _mm_srai_epi32(u[6], DCT_CONST_BITS);
-  v[7] = _mm_srai_epi32(u[7], DCT_CONST_BITS);
-  v[8] = _mm_srai_epi32(u[8], DCT_CONST_BITS);
-  v[9] = _mm_srai_epi32(u[9], DCT_CONST_BITS);
-  v[10] = _mm_srai_epi32(u[10], DCT_CONST_BITS);
-  v[11] = _mm_srai_epi32(u[11], DCT_CONST_BITS);
-  v[12] = _mm_srai_epi32(u[12], DCT_CONST_BITS);
-  v[13] = _mm_srai_epi32(u[13], DCT_CONST_BITS);
-  v[14] = _mm_srai_epi32(u[14], DCT_CONST_BITS);
-  v[15] = _mm_srai_epi32(u[15], DCT_CONST_BITS);
-
-  s[0] = _mm_add_epi16(x[0], x[2]);
-  s[1] = _mm_add_epi16(x[1], x[3]);
-  s[2] = _mm_sub_epi16(x[0], x[2]);
-  s[3] = _mm_sub_epi16(x[1], x[3]);
-  s[4] = _mm_packs_epi32(v[0], v[1]);
-  s[5] = _mm_packs_epi32(v[2], v[3]);
-  s[6] = _mm_packs_epi32(v[4], v[5]);
-  s[7] = _mm_packs_epi32(v[6], v[7]);
-  s[8] = _mm_add_epi16(x[8], x[10]);
-  s[9] = _mm_add_epi16(x[9], x[11]);
-  s[10] = _mm_sub_epi16(x[8], x[10]);
-  s[11] = _mm_sub_epi16(x[9], x[11]);
-  s[12] = _mm_packs_epi32(v[8], v[9]);
-  s[13] = _mm_packs_epi32(v[10], v[11]);
-  s[14] = _mm_packs_epi32(v[12], v[13]);
-  s[15] = _mm_packs_epi32(v[14], v[15]);
-
-  // stage 4
-  u[0] = _mm_unpacklo_epi16(s[2], s[3]);
-  u[1] = _mm_unpackhi_epi16(s[2], s[3]);
-  u[2] = _mm_unpacklo_epi16(s[6], s[7]);
-  u[3] = _mm_unpackhi_epi16(s[6], s[7]);
-  u[4] = _mm_unpacklo_epi16(s[10], s[11]);
-  u[5] = _mm_unpackhi_epi16(s[10], s[11]);
-  u[6] = _mm_unpacklo_epi16(s[14], s[15]);
-  u[7] = _mm_unpackhi_epi16(s[14], s[15]);
-
-  v[0] = _mm_madd_epi16(u[0], k__cospi_m16_m16);
-  v[1] = _mm_madd_epi16(u[1], k__cospi_m16_m16);
-  v[2] = _mm_madd_epi16(u[0], k__cospi_p16_m16);
-  v[3] = _mm_madd_epi16(u[1], k__cospi_p16_m16);
-  v[4] = _mm_madd_epi16(u[2], k__cospi_p16_p16);
-  v[5] = _mm_madd_epi16(u[3], k__cospi_p16_p16);
-  v[6] = _mm_madd_epi16(u[2], k__cospi_m16_p16);
-  v[7] = _mm_madd_epi16(u[3], k__cospi_m16_p16);
-  v[8] = _mm_madd_epi16(u[4], k__cospi_p16_p16);
-  v[9] = _mm_madd_epi16(u[5], k__cospi_p16_p16);
-  v[10] = _mm_madd_epi16(u[4], k__cospi_m16_p16);
-  v[11] = _mm_madd_epi16(u[5], k__cospi_m16_p16);
-  v[12] = _mm_madd_epi16(u[6], k__cospi_m16_m16);
-  v[13] = _mm_madd_epi16(u[7], k__cospi_m16_m16);
-  v[14] = _mm_madd_epi16(u[6], k__cospi_p16_m16);
-  v[15] = _mm_madd_epi16(u[7], k__cospi_p16_m16);
-
-  u[0] = _mm_add_epi32(v[0], k__DCT_CONST_ROUNDING);
-  u[1] = _mm_add_epi32(v[1], k__DCT_CONST_ROUNDING);
-  u[2] = _mm_add_epi32(v[2], k__DCT_CONST_ROUNDING);
-  u[3] = _mm_add_epi32(v[3], k__DCT_CONST_ROUNDING);
-  u[4] = _mm_add_epi32(v[4], k__DCT_CONST_ROUNDING);
-  u[5] = _mm_add_epi32(v[5], k__DCT_CONST_ROUNDING);
-  u[6] = _mm_add_epi32(v[6], k__DCT_CONST_ROUNDING);
-  u[7] = _mm_add_epi32(v[7], k__DCT_CONST_ROUNDING);
-  u[8] = _mm_add_epi32(v[8], k__DCT_CONST_ROUNDING);
-  u[9] = _mm_add_epi32(v[9], k__DCT_CONST_ROUNDING);
-  u[10] = _mm_add_epi32(v[10], k__DCT_CONST_ROUNDING);
-  u[11] = _mm_add_epi32(v[11], k__DCT_CONST_ROUNDING);
-  u[12] = _mm_add_epi32(v[12], k__DCT_CONST_ROUNDING);
-  u[13] = _mm_add_epi32(v[13], k__DCT_CONST_ROUNDING);
-  u[14] = _mm_add_epi32(v[14], k__DCT_CONST_ROUNDING);
-  u[15] = _mm_add_epi32(v[15], k__DCT_CONST_ROUNDING);
-
-  v[0] = _mm_srai_epi32(u[0], DCT_CONST_BITS);
-  v[1] = _mm_srai_epi32(u[1], DCT_CONST_BITS);
-  v[2] = _mm_srai_epi32(u[2], DCT_CONST_BITS);
-  v[3] = _mm_srai_epi32(u[3], DCT_CONST_BITS);
-  v[4] = _mm_srai_epi32(u[4], DCT_CONST_BITS);
-  v[5] = _mm_srai_epi32(u[5], DCT_CONST_BITS);
-  v[6] = _mm_srai_epi32(u[6], DCT_CONST_BITS);
-  v[7] = _mm_srai_epi32(u[7], DCT_CONST_BITS);
-  v[8] = _mm_srai_epi32(u[8], DCT_CONST_BITS);
-  v[9] = _mm_srai_epi32(u[9], DCT_CONST_BITS);
-  v[10] = _mm_srai_epi32(u[10], DCT_CONST_BITS);
-  v[11] = _mm_srai_epi32(u[11], DCT_CONST_BITS);
-  v[12] = _mm_srai_epi32(u[12], DCT_CONST_BITS);
-  v[13] = _mm_srai_epi32(u[13], DCT_CONST_BITS);
-  v[14] = _mm_srai_epi32(u[14], DCT_CONST_BITS);
-  v[15] = _mm_srai_epi32(u[15], DCT_CONST_BITS);
-
-  in[0] = s[0];
-  in[1] = _mm_sub_epi16(kZero, s[8]);
-  in[2] = s[12];
-  in[3] = _mm_sub_epi16(kZero, s[4]);
-  in[4] = _mm_packs_epi32(v[4], v[5]);
-  in[5] = _mm_packs_epi32(v[12], v[13]);
-  in[6] = _mm_packs_epi32(v[8], v[9]);
-  in[7] = _mm_packs_epi32(v[0], v[1]);
-  in[8] = _mm_packs_epi32(v[2], v[3]);
-  in[9] = _mm_packs_epi32(v[10], v[11]);
-  in[10] = _mm_packs_epi32(v[14], v[15]);
-  in[11] = _mm_packs_epi32(v[6], v[7]);
-  in[12] = s[5];
-  in[13] = _mm_sub_epi16(kZero, s[13]);
-  in[14] = s[9];
-  in[15] = _mm_sub_epi16(kZero, s[1]);
-}
-
-void fdct16_avx2(__m128i *in0, __m128i *in1) {
-  fdct16_8col_avx2(in0);
-  fdct16_8col_avx2(in1);
-  array_transpose_16x16_avx2(in0, in1);
-}
-
-void fadst16_avx2(__m128i *in0, __m128i *in1) {
-  fadst16_8col_avx2(in0);
-  fadst16_8col_avx2(in1);
-  array_transpose_16x16_avx2(in0, in1);
-}
-
-void vp9_fht16x16_avx2(const int16_t *input, int16_t *output,
-                      int stride, int tx_type) {
-  __m128i in0[16], in1[16];
-
-  switch (tx_type) {
-    case DCT_DCT:
-      vp9_fdct16x16_avx2(input, output, stride);
-      break;
-    case ADST_DCT:
-      load_buffer_16x16_avx2(input, in0, in1, stride);
-      fadst16_avx2(in0, in1);
-      right_shift_16x16_avx2(in0, in1);
-      fdct16_avx2(in0, in1);
-      write_buffer_16x16_avx2(output, in0, in1, 16);
-      break;
-    case DCT_ADST:
-      load_buffer_16x16_avx2(input, in0, in1, stride);
-      fdct16_avx2(in0, in1);
-      right_shift_16x16_avx2(in0, in1);
-      fadst16_avx2(in0, in1);
-      write_buffer_16x16_avx2(output, in0, in1, 16);
-      break;
-    case ADST_ADST:
-      load_buffer_16x16_avx2(input, in0, in1, stride);
-      fadst16_avx2(in0, in1);
-      right_shift_16x16_avx2(in0, in1);
-      fadst16_avx2(in0, in1);
-      write_buffer_16x16_avx2(output, in0, in1, 16);
-      break;
-    default:
-      assert(0);
-      break;
-  }
-}
 
 #define FDCT32x32_2D_AVX2 vp9_fdct32x32_rd_avx2
 #define FDCT32x32_HIGH_PRECISION 0