/*
 *  Copyright (c) 2014 The WebM project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#include <arm_neon.h>

#include "./vpx_config.h"
#include "aom_dsp/txfm_common.h"

static INLINE void TRANSPOSE8X8(int16x8_t *q8s16, int16x8_t *q9s16,
                                int16x8_t *q10s16, int16x8_t *q11s16,
                                int16x8_t *q12s16, int16x8_t *q13s16,
                                int16x8_t *q14s16, int16x8_t *q15s16) {
  int16x4_t d16s16, d17s16, d18s16, d19s16, d20s16, d21s16, d22s16, d23s16;
  int16x4_t d24s16, d25s16, d26s16, d27s16, d28s16, d29s16, d30s16, d31s16;
  int32x4x2_t q0x2s32, q1x2s32, q2x2s32, q3x2s32;
  int16x8x2_t q0x2s16, q1x2s16, q2x2s16, q3x2s16;

  d16s16 = vget_low_s16(*q8s16);
  d17s16 = vget_high_s16(*q8s16);
  d18s16 = vget_low_s16(*q9s16);
  d19s16 = vget_high_s16(*q9s16);
  d20s16 = vget_low_s16(*q10s16);
  d21s16 = vget_high_s16(*q10s16);
  d22s16 = vget_low_s16(*q11s16);
  d23s16 = vget_high_s16(*q11s16);
  d24s16 = vget_low_s16(*q12s16);
  d25s16 = vget_high_s16(*q12s16);
  d26s16 = vget_low_s16(*q13s16);
  d27s16 = vget_high_s16(*q13s16);
  d28s16 = vget_low_s16(*q14s16);
  d29s16 = vget_high_s16(*q14s16);
  d30s16 = vget_low_s16(*q15s16);
  d31s16 = vget_high_s16(*q15s16);

  *q8s16 = vcombine_s16(d16s16, d24s16);   // vswp d17, d24
  *q9s16 = vcombine_s16(d18s16, d26s16);   // vswp d19, d26
  *q10s16 = vcombine_s16(d20s16, d28s16);  // vswp d21, d28
  *q11s16 = vcombine_s16(d22s16, d30s16);  // vswp d23, d30
  *q12s16 = vcombine_s16(d17s16, d25s16);
  *q13s16 = vcombine_s16(d19s16, d27s16);
  *q14s16 = vcombine_s16(d21s16, d29s16);
  *q15s16 = vcombine_s16(d23s16, d31s16);

  q0x2s32 =
      vtrnq_s32(vreinterpretq_s32_s16(*q8s16), vreinterpretq_s32_s16(*q10s16));
  q1x2s32 =
      vtrnq_s32(vreinterpretq_s32_s16(*q9s16), vreinterpretq_s32_s16(*q11s16));
  q2x2s32 =
      vtrnq_s32(vreinterpretq_s32_s16(*q12s16), vreinterpretq_s32_s16(*q14s16));
  q3x2s32 =
      vtrnq_s32(vreinterpretq_s32_s16(*q13s16), vreinterpretq_s32_s16(*q15s16));

  q0x2s16 = vtrnq_s16(vreinterpretq_s16_s32(q0x2s32.val[0]),   // q8
                      vreinterpretq_s16_s32(q1x2s32.val[0]));  // q9
  q1x2s16 = vtrnq_s16(vreinterpretq_s16_s32(q0x2s32.val[1]),   // q10
                      vreinterpretq_s16_s32(q1x2s32.val[1]));  // q11
  q2x2s16 = vtrnq_s16(vreinterpretq_s16_s32(q2x2s32.val[0]),   // q12
                      vreinterpretq_s16_s32(q3x2s32.val[0]));  // q13
  q3x2s16 = vtrnq_s16(vreinterpretq_s16_s32(q2x2s32.val[1]),   // q14
                      vreinterpretq_s16_s32(q3x2s32.val[1]));  // q15

  *q8s16 = q0x2s16.val[0];
  *q9s16 = q0x2s16.val[1];
  *q10s16 = q1x2s16.val[0];
  *q11s16 = q1x2s16.val[1];
  *q12s16 = q2x2s16.val[0];
  *q13s16 = q2x2s16.val[1];
  *q14s16 = q3x2s16.val[0];
  *q15s16 = q3x2s16.val[1];
  return;
}

void vpx_idct16x16_256_add_neon_pass1(int16_t *in, int16_t *out,
                                      int output_stride) {
  int16x4_t d0s16, d1s16, d2s16, d3s16;
  int16x4_t d8s16, d9s16, d10s16, d11s16, d12s16, d13s16, d14s16, d15s16;
  int16x4_t d16s16, d17s16, d18s16, d19s16, d20s16, d21s16, d22s16, d23s16;
  int16x4_t d24s16, d25s16, d26s16, d27s16, d28s16, d29s16, d30s16, d31s16;
  uint64x1_t d16u64, d17u64, d18u64, d19u64, d20u64, d21u64, d22u64, d23u64;
  uint64x1_t d24u64, d25u64, d26u64, d27u64, d28u64, d29u64, d30u64, d31u64;
  int16x8_t q0s16, q1s16, q2s16, q3s16, q4s16, q5s16, q6s16, q7s16;
  int16x8_t q8s16, q9s16, q10s16, q11s16, q12s16, q13s16, q14s16, q15s16;
  int32x4_t q0s32, q1s32, q2s32, q3s32, q5s32, q6s32, q9s32;
  int32x4_t q10s32, q11s32, q12s32, q13s32, q15s32;
  int16x8x2_t q0x2s16;

  q0x2s16 = vld2q_s16(in);
  q8s16 = q0x2s16.val[0];
  in += 16;
  q0x2s16 = vld2q_s16(in);
  q9s16 = q0x2s16.val[0];
  in += 16;
  q0x2s16 = vld2q_s16(in);
  q10s16 = q0x2s16.val[0];
  in += 16;
  q0x2s16 = vld2q_s16(in);
  q11s16 = q0x2s16.val[0];
  in += 16;
  q0x2s16 = vld2q_s16(in);
  q12s16 = q0x2s16.val[0];
  in += 16;
  q0x2s16 = vld2q_s16(in);
  q13s16 = q0x2s16.val[0];
  in += 16;
  q0x2s16 = vld2q_s16(in);
  q14s16 = q0x2s16.val[0];
  in += 16;
  q0x2s16 = vld2q_s16(in);
  q15s16 = q0x2s16.val[0];

  TRANSPOSE8X8(&q8s16, &q9s16, &q10s16, &q11s16, &q12s16, &q13s16, &q14s16,
               &q15s16);

  d16s16 = vget_low_s16(q8s16);
  d17s16 = vget_high_s16(q8s16);
  d18s16 = vget_low_s16(q9s16);
  d19s16 = vget_high_s16(q9s16);
  d20s16 = vget_low_s16(q10s16);
  d21s16 = vget_high_s16(q10s16);
  d22s16 = vget_low_s16(q11s16);
  d23s16 = vget_high_s16(q11s16);
  d24s16 = vget_low_s16(q12s16);
  d25s16 = vget_high_s16(q12s16);
  d26s16 = vget_low_s16(q13s16);
  d27s16 = vget_high_s16(q13s16);
  d28s16 = vget_low_s16(q14s16);
  d29s16 = vget_high_s16(q14s16);
  d30s16 = vget_low_s16(q15s16);
  d31s16 = vget_high_s16(q15s16);

  // stage 3
  d0s16 = vdup_n_s16(cospi_28_64);
  d1s16 = vdup_n_s16(cospi_4_64);

  q2s32 = vmull_s16(d18s16, d0s16);
  q3s32 = vmull_s16(d19s16, d0s16);
  q5s32 = vmull_s16(d18s16, d1s16);
  q6s32 = vmull_s16(d19s16, d1s16);

  q2s32 = vmlsl_s16(q2s32, d30s16, d1s16);
  q3s32 = vmlsl_s16(q3s32, d31s16, d1s16);
  q5s32 = vmlal_s16(q5s32, d30s16, d0s16);
  q6s32 = vmlal_s16(q6s32, d31s16, d0s16);

  d2s16 = vdup_n_s16(cospi_12_64);
  d3s16 = vdup_n_s16(cospi_20_64);

  d8s16 = vqrshrn_n_s32(q2s32, 14);
  d9s16 = vqrshrn_n_s32(q3s32, 14);
  d14s16 = vqrshrn_n_s32(q5s32, 14);
  d15s16 = vqrshrn_n_s32(q6s32, 14);
  q4s16 = vcombine_s16(d8s16, d9s16);
  q7s16 = vcombine_s16(d14s16, d15s16);

  q2s32 = vmull_s16(d26s16, d2s16);
  q3s32 = vmull_s16(d27s16, d2s16);
  q9s32 = vmull_s16(d26s16, d3s16);
  q15s32 = vmull_s16(d27s16, d3s16);

  q2s32 = vmlsl_s16(q2s32, d22s16, d3s16);
  q3s32 = vmlsl_s16(q3s32, d23s16, d3s16);
  q9s32 = vmlal_s16(q9s32, d22s16, d2s16);
  q15s32 = vmlal_s16(q15s32, d23s16, d2s16);

  d10s16 = vqrshrn_n_s32(q2s32, 14);
  d11s16 = vqrshrn_n_s32(q3s32, 14);
  d12s16 = vqrshrn_n_s32(q9s32, 14);
  d13s16 = vqrshrn_n_s32(q15s32, 14);
  q5s16 = vcombine_s16(d10s16, d11s16);
  q6s16 = vcombine_s16(d12s16, d13s16);

  // stage 4
  d30s16 = vdup_n_s16(cospi_16_64);

  q2s32 = vmull_s16(d16s16, d30s16);
  q11s32 = vmull_s16(d17s16, d30s16);
  q0s32 = vmull_s16(d24s16, d30s16);
  q1s32 = vmull_s16(d25s16, d30s16);

  d30s16 = vdup_n_s16(cospi_24_64);
  d31s16 = vdup_n_s16(cospi_8_64);

  q3s32 = vaddq_s32(q2s32, q0s32);
  q12s32 = vaddq_s32(q11s32, q1s32);
  q13s32 = vsubq_s32(q2s32, q0s32);
  q1s32 = vsubq_s32(q11s32, q1s32);

  d16s16 = vqrshrn_n_s32(q3s32, 14);
  d17s16 = vqrshrn_n_s32(q12s32, 14);
  d18s16 = vqrshrn_n_s32(q13s32, 14);
  d19s16 = vqrshrn_n_s32(q1s32, 14);
  q8s16 = vcombine_s16(d16s16, d17s16);
  q9s16 = vcombine_s16(d18s16, d19s16);

  q0s32 = vmull_s16(d20s16, d31s16);
  q1s32 = vmull_s16(d21s16, d31s16);
  q12s32 = vmull_s16(d20s16, d30s16);
  q13s32 = vmull_s16(d21s16, d30s16);

  q0s32 = vmlal_s16(q0s32, d28s16, d30s16);
  q1s32 = vmlal_s16(q1s32, d29s16, d30s16);
  q12s32 = vmlsl_s16(q12s32, d28s16, d31s16);
  q13s32 = vmlsl_s16(q13s32, d29s16, d31s16);

  d22s16 = vqrshrn_n_s32(q0s32, 14);
  d23s16 = vqrshrn_n_s32(q1s32, 14);
  d20s16 = vqrshrn_n_s32(q12s32, 14);
  d21s16 = vqrshrn_n_s32(q13s32, 14);
  q10s16 = vcombine_s16(d20s16, d21s16);
  q11s16 = vcombine_s16(d22s16, d23s16);

  q13s16 = vsubq_s16(q4s16, q5s16);
  q4s16 = vaddq_s16(q4s16, q5s16);
  q14s16 = vsubq_s16(q7s16, q6s16);
  q15s16 = vaddq_s16(q6s16, q7s16);
  d26s16 = vget_low_s16(q13s16);
  d27s16 = vget_high_s16(q13s16);
  d28s16 = vget_low_s16(q14s16);
  d29s16 = vget_high_s16(q14s16);

  // stage 5
  q0s16 = vaddq_s16(q8s16, q11s16);
  q1s16 = vaddq_s16(q9s16, q10s16);
  q2s16 = vsubq_s16(q9s16, q10s16);
  q3s16 = vsubq_s16(q8s16, q11s16);

  d16s16 = vdup_n_s16(cospi_16_64);

  q11s32 = vmull_s16(d26s16, d16s16);
  q12s32 = vmull_s16(d27s16, d16s16);
  q9s32 = vmull_s16(d28s16, d16s16);
  q10s32 = vmull_s16(d29s16, d16s16);

  q6s32 = vsubq_s32(q9s32, q11s32);
  q13s32 = vsubq_s32(q10s32, q12s32);
  q9s32 = vaddq_s32(q9s32, q11s32);
  q10s32 = vaddq_s32(q10s32, q12s32);

  d10s16 = vqrshrn_n_s32(q6s32, 14);
  d11s16 = vqrshrn_n_s32(q13s32, 14);
  d12s16 = vqrshrn_n_s32(q9s32, 14);
  d13s16 = vqrshrn_n_s32(q10s32, 14);
  q5s16 = vcombine_s16(d10s16, d11s16);
  q6s16 = vcombine_s16(d12s16, d13s16);

  // stage 6
  q8s16 = vaddq_s16(q0s16, q15s16);
  q9s16 = vaddq_s16(q1s16, q6s16);
  q10s16 = vaddq_s16(q2s16, q5s16);
  q11s16 = vaddq_s16(q3s16, q4s16);
  q12s16 = vsubq_s16(q3s16, q4s16);
  q13s16 = vsubq_s16(q2s16, q5s16);
  q14s16 = vsubq_s16(q1s16, q6s16);
  q15s16 = vsubq_s16(q0s16, q15s16);

  d16u64 = vreinterpret_u64_s16(vget_low_s16(q8s16));
  d17u64 = vreinterpret_u64_s16(vget_high_s16(q8s16));
  d18u64 = vreinterpret_u64_s16(vget_low_s16(q9s16));
  d19u64 = vreinterpret_u64_s16(vget_high_s16(q9s16));
  d20u64 = vreinterpret_u64_s16(vget_low_s16(q10s16));
  d21u64 = vreinterpret_u64_s16(vget_high_s16(q10s16));
  d22u64 = vreinterpret_u64_s16(vget_low_s16(q11s16));
  d23u64 = vreinterpret_u64_s16(vget_high_s16(q11s16));
  d24u64 = vreinterpret_u64_s16(vget_low_s16(q12s16));
  d25u64 = vreinterpret_u64_s16(vget_high_s16(q12s16));
  d26u64 = vreinterpret_u64_s16(vget_low_s16(q13s16));
  d27u64 = vreinterpret_u64_s16(vget_high_s16(q13s16));
  d28u64 = vreinterpret_u64_s16(vget_low_s16(q14s16));
  d29u64 = vreinterpret_u64_s16(vget_high_s16(q14s16));
  d30u64 = vreinterpret_u64_s16(vget_low_s16(q15s16));
  d31u64 = vreinterpret_u64_s16(vget_high_s16(q15s16));

  // store the data
  output_stride >>= 1;  // output_stride / 2, out is int16_t
  vst1_u64((uint64_t *)out, d16u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d17u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d18u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d19u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d20u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d21u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d22u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d23u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d24u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d25u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d26u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d27u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d28u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d29u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d30u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d31u64);
  return;
}

void vpx_idct16x16_256_add_neon_pass2(int16_t *src, int16_t *out,
                                      int16_t *pass1Output, int16_t skip_adding,
                                      uint8_t *dest, int dest_stride) {
  uint8_t *d;
  uint8x8_t d12u8, d13u8;
  int16x4_t d0s16, d1s16, d2s16, d3s16, d4s16, d5s16, d6s16, d7s16;
  int16x4_t d8s16, d9s16, d10s16, d11s16, d12s16, d13s16, d14s16, d15s16;
  int16x4_t d16s16, d17s16, d18s16, d19s16, d20s16, d21s16, d22s16, d23s16;
  int16x4_t d24s16, d25s16, d26s16, d27s16, d28s16, d29s16, d30s16, d31s16;
  uint64x1_t d24u64, d25u64, d26u64, d27u64;
  int64x1_t d12s64, d13s64;
  uint16x8_t q2u16, q3u16, q4u16, q5u16, q8u16;
  uint16x8_t q9u16, q12u16, q13u16, q14u16, q15u16;
  int16x8_t q0s16, q1s16, q2s16, q3s16, q4s16, q5s16, q6s16, q7s16;
  int16x8_t q8s16, q9s16, q10s16, q11s16, q12s16, q13s16, q14s16, q15s16;
  int32x4_t q0s32, q1s32, q2s32, q3s32, q4s32, q5s32, q6s32, q8s32, q9s32;
  int32x4_t q10s32, q11s32, q12s32, q13s32;
  int16x8x2_t q0x2s16;

  q0x2s16 = vld2q_s16(src);
  q8s16 = q0x2s16.val[0];
  src += 16;
  q0x2s16 = vld2q_s16(src);
  q9s16 = q0x2s16.val[0];
  src += 16;
  q0x2s16 = vld2q_s16(src);
  q10s16 = q0x2s16.val[0];
  src += 16;
  q0x2s16 = vld2q_s16(src);
  q11s16 = q0x2s16.val[0];
  src += 16;
  q0x2s16 = vld2q_s16(src);
  q12s16 = q0x2s16.val[0];
  src += 16;
  q0x2s16 = vld2q_s16(src);
  q13s16 = q0x2s16.val[0];
  src += 16;
  q0x2s16 = vld2q_s16(src);
  q14s16 = q0x2s16.val[0];
  src += 16;
  q0x2s16 = vld2q_s16(src);
  q15s16 = q0x2s16.val[0];

  TRANSPOSE8X8(&q8s16, &q9s16, &q10s16, &q11s16, &q12s16, &q13s16, &q14s16,
               &q15s16);

  d16s16 = vget_low_s16(q8s16);
  d17s16 = vget_high_s16(q8s16);
  d18s16 = vget_low_s16(q9s16);
  d19s16 = vget_high_s16(q9s16);
  d20s16 = vget_low_s16(q10s16);
  d21s16 = vget_high_s16(q10s16);
  d22s16 = vget_low_s16(q11s16);
  d23s16 = vget_high_s16(q11s16);
  d24s16 = vget_low_s16(q12s16);
  d25s16 = vget_high_s16(q12s16);
  d26s16 = vget_low_s16(q13s16);
  d27s16 = vget_high_s16(q13s16);
  d28s16 = vget_low_s16(q14s16);
  d29s16 = vget_high_s16(q14s16);
  d30s16 = vget_low_s16(q15s16);
  d31s16 = vget_high_s16(q15s16);

  // stage 3
  d12s16 = vdup_n_s16(cospi_30_64);
  d13s16 = vdup_n_s16(cospi_2_64);

  q2s32 = vmull_s16(d16s16, d12s16);
  q3s32 = vmull_s16(d17s16, d12s16);
  q1s32 = vmull_s16(d16s16, d13s16);
  q4s32 = vmull_s16(d17s16, d13s16);

  q2s32 = vmlsl_s16(q2s32, d30s16, d13s16);
  q3s32 = vmlsl_s16(q3s32, d31s16, d13s16);
  q1s32 = vmlal_s16(q1s32, d30s16, d12s16);
  q4s32 = vmlal_s16(q4s32, d31s16, d12s16);

  d0s16 = vqrshrn_n_s32(q2s32, 14);
  d1s16 = vqrshrn_n_s32(q3s32, 14);
  d14s16 = vqrshrn_n_s32(q1s32, 14);
  d15s16 = vqrshrn_n_s32(q4s32, 14);
  q0s16 = vcombine_s16(d0s16, d1s16);
  q7s16 = vcombine_s16(d14s16, d15s16);

  d30s16 = vdup_n_s16(cospi_14_64);
  d31s16 = vdup_n_s16(cospi_18_64);

  q2s32 = vmull_s16(d24s16, d30s16);
  q3s32 = vmull_s16(d25s16, d30s16);
  q4s32 = vmull_s16(d24s16, d31s16);
  q5s32 = vmull_s16(d25s16, d31s16);

  q2s32 = vmlsl_s16(q2s32, d22s16, d31s16);
  q3s32 = vmlsl_s16(q3s32, d23s16, d31s16);
  q4s32 = vmlal_s16(q4s32, d22s16, d30s16);
  q5s32 = vmlal_s16(q5s32, d23s16, d30s16);

  d2s16 = vqrshrn_n_s32(q2s32, 14);
  d3s16 = vqrshrn_n_s32(q3s32, 14);
  d12s16 = vqrshrn_n_s32(q4s32, 14);
  d13s16 = vqrshrn_n_s32(q5s32, 14);
  q1s16 = vcombine_s16(d2s16, d3s16);
  q6s16 = vcombine_s16(d12s16, d13s16);

  d30s16 = vdup_n_s16(cospi_22_64);
  d31s16 = vdup_n_s16(cospi_10_64);

  q11s32 = vmull_s16(d20s16, d30s16);
  q12s32 = vmull_s16(d21s16, d30s16);
  q4s32 = vmull_s16(d20s16, d31s16);
  q5s32 = vmull_s16(d21s16, d31s16);

  q11s32 = vmlsl_s16(q11s32, d26s16, d31s16);
  q12s32 = vmlsl_s16(q12s32, d27s16, d31s16);
  q4s32 = vmlal_s16(q4s32, d26s16, d30s16);
  q5s32 = vmlal_s16(q5s32, d27s16, d30s16);

  d4s16 = vqrshrn_n_s32(q11s32, 14);
  d5s16 = vqrshrn_n_s32(q12s32, 14);
  d11s16 = vqrshrn_n_s32(q5s32, 14);
  d10s16 = vqrshrn_n_s32(q4s32, 14);
  q2s16 = vcombine_s16(d4s16, d5s16);
  q5s16 = vcombine_s16(d10s16, d11s16);

  d30s16 = vdup_n_s16(cospi_6_64);
  d31s16 = vdup_n_s16(cospi_26_64);

  q10s32 = vmull_s16(d28s16, d30s16);
  q11s32 = vmull_s16(d29s16, d30s16);
  q12s32 = vmull_s16(d28s16, d31s16);
  q13s32 = vmull_s16(d29s16, d31s16);

  q10s32 = vmlsl_s16(q10s32, d18s16, d31s16);
  q11s32 = vmlsl_s16(q11s32, d19s16, d31s16);
  q12s32 = vmlal_s16(q12s32, d18s16, d30s16);
  q13s32 = vmlal_s16(q13s32, d19s16, d30s16);

  d6s16 = vqrshrn_n_s32(q10s32, 14);
  d7s16 = vqrshrn_n_s32(q11s32, 14);
  d8s16 = vqrshrn_n_s32(q12s32, 14);
  d9s16 = vqrshrn_n_s32(q13s32, 14);
  q3s16 = vcombine_s16(d6s16, d7s16);
  q4s16 = vcombine_s16(d8s16, d9s16);

  // stage 3
  q9s16 = vsubq_s16(q0s16, q1s16);
  q0s16 = vaddq_s16(q0s16, q1s16);
  q10s16 = vsubq_s16(q3s16, q2s16);
  q11s16 = vaddq_s16(q2s16, q3s16);
  q12s16 = vaddq_s16(q4s16, q5s16);
  q13s16 = vsubq_s16(q4s16, q5s16);
  q14s16 = vsubq_s16(q7s16, q6s16);
  q7s16 = vaddq_s16(q6s16, q7s16);

  // stage 4
  d18s16 = vget_low_s16(q9s16);
  d19s16 = vget_high_s16(q9s16);
  d20s16 = vget_low_s16(q10s16);
  d21s16 = vget_high_s16(q10s16);
  d26s16 = vget_low_s16(q13s16);
  d27s16 = vget_high_s16(q13s16);
  d28s16 = vget_low_s16(q14s16);
  d29s16 = vget_high_s16(q14s16);

  d30s16 = vdup_n_s16(cospi_8_64);
  d31s16 = vdup_n_s16(cospi_24_64);

  q2s32 = vmull_s16(d18s16, d31s16);
  q3s32 = vmull_s16(d19s16, d31s16);
  q4s32 = vmull_s16(d28s16, d31s16);
  q5s32 = vmull_s16(d29s16, d31s16);

  q2s32 = vmlal_s16(q2s32, d28s16, d30s16);
  q3s32 = vmlal_s16(q3s32, d29s16, d30s16);
  q4s32 = vmlsl_s16(q4s32, d18s16, d30s16);
  q5s32 = vmlsl_s16(q5s32, d19s16, d30s16);

  d12s16 = vqrshrn_n_s32(q2s32, 14);
  d13s16 = vqrshrn_n_s32(q3s32, 14);
  d2s16 = vqrshrn_n_s32(q4s32, 14);
  d3s16 = vqrshrn_n_s32(q5s32, 14);
  q1s16 = vcombine_s16(d2s16, d3s16);
  q6s16 = vcombine_s16(d12s16, d13s16);

  q3s16 = q11s16;
  q4s16 = q12s16;

  d30s16 = vdup_n_s16(-cospi_8_64);
  q11s32 = vmull_s16(d26s16, d30s16);
  q12s32 = vmull_s16(d27s16, d30s16);
  q8s32 = vmull_s16(d20s16, d30s16);
  q9s32 = vmull_s16(d21s16, d30s16);

  q11s32 = vmlsl_s16(q11s32, d20s16, d31s16);
  q12s32 = vmlsl_s16(q12s32, d21s16, d31s16);
  q8s32 = vmlal_s16(q8s32, d26s16, d31s16);
  q9s32 = vmlal_s16(q9s32, d27s16, d31s16);

  d4s16 = vqrshrn_n_s32(q11s32, 14);
  d5s16 = vqrshrn_n_s32(q12s32, 14);
  d10s16 = vqrshrn_n_s32(q8s32, 14);
  d11s16 = vqrshrn_n_s32(q9s32, 14);
  q2s16 = vcombine_s16(d4s16, d5s16);
  q5s16 = vcombine_s16(d10s16, d11s16);

  // stage 5
  q8s16 = vaddq_s16(q0s16, q3s16);
  q9s16 = vaddq_s16(q1s16, q2s16);
  q10s16 = vsubq_s16(q1s16, q2s16);
  q11s16 = vsubq_s16(q0s16, q3s16);
  q12s16 = vsubq_s16(q7s16, q4s16);
  q13s16 = vsubq_s16(q6s16, q5s16);
  q14s16 = vaddq_s16(q6s16, q5s16);
  q15s16 = vaddq_s16(q7s16, q4s16);

  // stage 6
  d20s16 = vget_low_s16(q10s16);
  d21s16 = vget_high_s16(q10s16);
  d22s16 = vget_low_s16(q11s16);
  d23s16 = vget_high_s16(q11s16);
  d24s16 = vget_low_s16(q12s16);
  d25s16 = vget_high_s16(q12s16);
  d26s16 = vget_low_s16(q13s16);
  d27s16 = vget_high_s16(q13s16);

  d14s16 = vdup_n_s16(cospi_16_64);

  q3s32 = vmull_s16(d26s16, d14s16);
  q4s32 = vmull_s16(d27s16, d14s16);
  q0s32 = vmull_s16(d20s16, d14s16);
  q1s32 = vmull_s16(d21s16, d14s16);

  q5s32 = vsubq_s32(q3s32, q0s32);
  q6s32 = vsubq_s32(q4s32, q1s32);
  q10s32 = vaddq_s32(q3s32, q0s32);
  q4s32 = vaddq_s32(q4s32, q1s32);

  d4s16 = vqrshrn_n_s32(q5s32, 14);
  d5s16 = vqrshrn_n_s32(q6s32, 14);
  d10s16 = vqrshrn_n_s32(q10s32, 14);
  d11s16 = vqrshrn_n_s32(q4s32, 14);
  q2s16 = vcombine_s16(d4s16, d5s16);
  q5s16 = vcombine_s16(d10s16, d11s16);

  q0s32 = vmull_s16(d22s16, d14s16);
  q1s32 = vmull_s16(d23s16, d14s16);
  q13s32 = vmull_s16(d24s16, d14s16);
  q6s32 = vmull_s16(d25s16, d14s16);

  q10s32 = vsubq_s32(q13s32, q0s32);
  q4s32 = vsubq_s32(q6s32, q1s32);
  q13s32 = vaddq_s32(q13s32, q0s32);
  q6s32 = vaddq_s32(q6s32, q1s32);

  d6s16 = vqrshrn_n_s32(q10s32, 14);
  d7s16 = vqrshrn_n_s32(q4s32, 14);
  d8s16 = vqrshrn_n_s32(q13s32, 14);
  d9s16 = vqrshrn_n_s32(q6s32, 14);
  q3s16 = vcombine_s16(d6s16, d7s16);
  q4s16 = vcombine_s16(d8s16, d9s16);

  // stage 7
  if (skip_adding != 0) {
    d = dest;
    // load the data in pass1
    q0s16 = vld1q_s16(pass1Output);
    pass1Output += 8;
    q1s16 = vld1q_s16(pass1Output);
    pass1Output += 8;
    d12s64 = vld1_s64((int64_t *)dest);
    dest += dest_stride;
    d13s64 = vld1_s64((int64_t *)dest);
    dest += dest_stride;

    q12s16 = vaddq_s16(q0s16, q15s16);
    q13s16 = vaddq_s16(q1s16, q14s16);
    q12s16 = vrshrq_n_s16(q12s16, 6);
    q13s16 = vrshrq_n_s16(q13s16, 6);
    q12u16 =
        vaddw_u8(vreinterpretq_u16_s16(q12s16), vreinterpret_u8_s64(d12s64));
    q13u16 =
        vaddw_u8(vreinterpretq_u16_s16(q13s16), vreinterpret_u8_s64(d13s64));
    d12u8 = vqmovun_s16(vreinterpretq_s16_u16(q12u16));
    d13u8 = vqmovun_s16(vreinterpretq_s16_u16(q13u16));
    vst1_u64((uint64_t *)d, vreinterpret_u64_u8(d12u8));
    d += dest_stride;
    vst1_u64((uint64_t *)d, vreinterpret_u64_u8(d13u8));
    d += dest_stride;
    q14s16 = vsubq_s16(q1s16, q14s16);
    q15s16 = vsubq_s16(q0s16, q15s16);

    q10s16 = vld1q_s16(pass1Output);
    pass1Output += 8;
    q11s16 = vld1q_s16(pass1Output);
    pass1Output += 8;
    d12s64 = vld1_s64((int64_t *)dest);
    dest += dest_stride;
    d13s64 = vld1_s64((int64_t *)dest);
    dest += dest_stride;
    q12s16 = vaddq_s16(q10s16, q5s16);
    q13s16 = vaddq_s16(q11s16, q4s16);
    q12s16 = vrshrq_n_s16(q12s16, 6);
    q13s16 = vrshrq_n_s16(q13s16, 6);
    q12u16 =
        vaddw_u8(vreinterpretq_u16_s16(q12s16), vreinterpret_u8_s64(d12s64));
    q13u16 =
        vaddw_u8(vreinterpretq_u16_s16(q13s16), vreinterpret_u8_s64(d13s64));
    d12u8 = vqmovun_s16(vreinterpretq_s16_u16(q12u16));
    d13u8 = vqmovun_s16(vreinterpretq_s16_u16(q13u16));
    vst1_u64((uint64_t *)d, vreinterpret_u64_u8(d12u8));
    d += dest_stride;
    vst1_u64((uint64_t *)d, vreinterpret_u64_u8(d13u8));
    d += dest_stride;
    q4s16 = vsubq_s16(q11s16, q4s16);
    q5s16 = vsubq_s16(q10s16, q5s16);

    q0s16 = vld1q_s16(pass1Output);
    pass1Output += 8;
    q1s16 = vld1q_s16(pass1Output);
    pass1Output += 8;
    d12s64 = vld1_s64((int64_t *)dest);
    dest += dest_stride;
    d13s64 = vld1_s64((int64_t *)dest);
    dest += dest_stride;
    q12s16 = vaddq_s16(q0s16, q3s16);
    q13s16 = vaddq_s16(q1s16, q2s16);
    q12s16 = vrshrq_n_s16(q12s16, 6);
    q13s16 = vrshrq_n_s16(q13s16, 6);
    q12u16 =
        vaddw_u8(vreinterpretq_u16_s16(q12s16), vreinterpret_u8_s64(d12s64));
    q13u16 =
        vaddw_u8(vreinterpretq_u16_s16(q13s16), vreinterpret_u8_s64(d13s64));
    d12u8 = vqmovun_s16(vreinterpretq_s16_u16(q12u16));
    d13u8 = vqmovun_s16(vreinterpretq_s16_u16(q13u16));
    vst1_u64((uint64_t *)d, vreinterpret_u64_u8(d12u8));
    d += dest_stride;
    vst1_u64((uint64_t *)d, vreinterpret_u64_u8(d13u8));
    d += dest_stride;
    q2s16 = vsubq_s16(q1s16, q2s16);
    q3s16 = vsubq_s16(q0s16, q3s16);

    q10s16 = vld1q_s16(pass1Output);
    pass1Output += 8;
    q11s16 = vld1q_s16(pass1Output);
    d12s64 = vld1_s64((int64_t *)dest);
    dest += dest_stride;
    d13s64 = vld1_s64((int64_t *)dest);
    dest += dest_stride;
    q12s16 = vaddq_s16(q10s16, q9s16);
    q13s16 = vaddq_s16(q11s16, q8s16);
    q12s16 = vrshrq_n_s16(q12s16, 6);
    q13s16 = vrshrq_n_s16(q13s16, 6);
    q12u16 =
        vaddw_u8(vreinterpretq_u16_s16(q12s16), vreinterpret_u8_s64(d12s64));
    q13u16 =
        vaddw_u8(vreinterpretq_u16_s16(q13s16), vreinterpret_u8_s64(d13s64));
    d12u8 = vqmovun_s16(vreinterpretq_s16_u16(q12u16));
    d13u8 = vqmovun_s16(vreinterpretq_s16_u16(q13u16));
    vst1_u64((uint64_t *)d, vreinterpret_u64_u8(d12u8));
    d += dest_stride;
    vst1_u64((uint64_t *)d, vreinterpret_u64_u8(d13u8));
    d += dest_stride;
    q8s16 = vsubq_s16(q11s16, q8s16);
    q9s16 = vsubq_s16(q10s16, q9s16);

    // store the data  out 8,9,10,11,12,13,14,15
    d12s64 = vld1_s64((int64_t *)dest);
    dest += dest_stride;
    q8s16 = vrshrq_n_s16(q8s16, 6);
    q8u16 = vaddw_u8(vreinterpretq_u16_s16(q8s16), vreinterpret_u8_s64(d12s64));
    d12u8 = vqmovun_s16(vreinterpretq_s16_u16(q8u16));
    vst1_u64((uint64_t *)d, vreinterpret_u64_u8(d12u8));
    d += dest_stride;

    d12s64 = vld1_s64((int64_t *)dest);
    dest += dest_stride;
    q9s16 = vrshrq_n_s16(q9s16, 6);
    q9u16 = vaddw_u8(vreinterpretq_u16_s16(q9s16), vreinterpret_u8_s64(d12s64));
    d12u8 = vqmovun_s16(vreinterpretq_s16_u16(q9u16));
    vst1_u64((uint64_t *)d, vreinterpret_u64_u8(d12u8));
    d += dest_stride;

    d12s64 = vld1_s64((int64_t *)dest);
    dest += dest_stride;
    q2s16 = vrshrq_n_s16(q2s16, 6);
    q2u16 = vaddw_u8(vreinterpretq_u16_s16(q2s16), vreinterpret_u8_s64(d12s64));
    d12u8 = vqmovun_s16(vreinterpretq_s16_u16(q2u16));
    vst1_u64((uint64_t *)d, vreinterpret_u64_u8(d12u8));
    d += dest_stride;

    d12s64 = vld1_s64((int64_t *)dest);
    dest += dest_stride;
    q3s16 = vrshrq_n_s16(q3s16, 6);
    q3u16 = vaddw_u8(vreinterpretq_u16_s16(q3s16), vreinterpret_u8_s64(d12s64));
    d12u8 = vqmovun_s16(vreinterpretq_s16_u16(q3u16));
    vst1_u64((uint64_t *)d, vreinterpret_u64_u8(d12u8));
    d += dest_stride;

    d12s64 = vld1_s64((int64_t *)dest);
    dest += dest_stride;
    q4s16 = vrshrq_n_s16(q4s16, 6);
    q4u16 = vaddw_u8(vreinterpretq_u16_s16(q4s16), vreinterpret_u8_s64(d12s64));
    d12u8 = vqmovun_s16(vreinterpretq_s16_u16(q4u16));
    vst1_u64((uint64_t *)d, vreinterpret_u64_u8(d12u8));
    d += dest_stride;

    d12s64 = vld1_s64((int64_t *)dest);
    dest += dest_stride;
    q5s16 = vrshrq_n_s16(q5s16, 6);
    q5u16 = vaddw_u8(vreinterpretq_u16_s16(q5s16), vreinterpret_u8_s64(d12s64));
    d12u8 = vqmovun_s16(vreinterpretq_s16_u16(q5u16));
    vst1_u64((uint64_t *)d, vreinterpret_u64_u8(d12u8));
    d += dest_stride;

    d12s64 = vld1_s64((int64_t *)dest);
    dest += dest_stride;
    q14s16 = vrshrq_n_s16(q14s16, 6);
    q14u16 =
        vaddw_u8(vreinterpretq_u16_s16(q14s16), vreinterpret_u8_s64(d12s64));
    d12u8 = vqmovun_s16(vreinterpretq_s16_u16(q14u16));
    vst1_u64((uint64_t *)d, vreinterpret_u64_u8(d12u8));
    d += dest_stride;

    d12s64 = vld1_s64((int64_t *)dest);
    q15s16 = vrshrq_n_s16(q15s16, 6);
    q15u16 =
        vaddw_u8(vreinterpretq_u16_s16(q15s16), vreinterpret_u8_s64(d12s64));
    d12u8 = vqmovun_s16(vreinterpretq_s16_u16(q15u16));
    vst1_u64((uint64_t *)d, vreinterpret_u64_u8(d12u8));
  } else {  // skip_adding_dest
    q0s16 = vld1q_s16(pass1Output);
    pass1Output += 8;
    q1s16 = vld1q_s16(pass1Output);
    pass1Output += 8;
    q12s16 = vaddq_s16(q0s16, q15s16);
    q13s16 = vaddq_s16(q1s16, q14s16);
    d24u64 = vreinterpret_u64_s16(vget_low_s16(q12s16));
    d25u64 = vreinterpret_u64_s16(vget_high_s16(q12s16));
    d26u64 = vreinterpret_u64_s16(vget_low_s16(q13s16));
    d27u64 = vreinterpret_u64_s16(vget_high_s16(q13s16));
    vst1_u64((uint64_t *)out, d24u64);
    out += 4;
    vst1_u64((uint64_t *)out, d25u64);
    out += 12;
    vst1_u64((uint64_t *)out, d26u64);
    out += 4;
    vst1_u64((uint64_t *)out, d27u64);
    out += 12;
    q14s16 = vsubq_s16(q1s16, q14s16);
    q15s16 = vsubq_s16(q0s16, q15s16);

    q10s16 = vld1q_s16(pass1Output);
    pass1Output += 8;
    q11s16 = vld1q_s16(pass1Output);
    pass1Output += 8;
    q12s16 = vaddq_s16(q10s16, q5s16);
    q13s16 = vaddq_s16(q11s16, q4s16);
    d24u64 = vreinterpret_u64_s16(vget_low_s16(q12s16));
    d25u64 = vreinterpret_u64_s16(vget_high_s16(q12s16));
    d26u64 = vreinterpret_u64_s16(vget_low_s16(q13s16));
    d27u64 = vreinterpret_u64_s16(vget_high_s16(q13s16));
    vst1_u64((uint64_t *)out, d24u64);
    out += 4;
    vst1_u64((uint64_t *)out, d25u64);
    out += 12;
    vst1_u64((uint64_t *)out, d26u64);
    out += 4;
    vst1_u64((uint64_t *)out, d27u64);
    out += 12;
    q4s16 = vsubq_s16(q11s16, q4s16);
    q5s16 = vsubq_s16(q10s16, q5s16);

    q0s16 = vld1q_s16(pass1Output);
    pass1Output += 8;
    q1s16 = vld1q_s16(pass1Output);
    pass1Output += 8;
    q12s16 = vaddq_s16(q0s16, q3s16);
    q13s16 = vaddq_s16(q1s16, q2s16);
    d24u64 = vreinterpret_u64_s16(vget_low_s16(q12s16));
    d25u64 = vreinterpret_u64_s16(vget_high_s16(q12s16));
    d26u64 = vreinterpret_u64_s16(vget_low_s16(q13s16));
    d27u64 = vreinterpret_u64_s16(vget_high_s16(q13s16));
    vst1_u64((uint64_t *)out, d24u64);
    out += 4;
    vst1_u64((uint64_t *)out, d25u64);
    out += 12;
    vst1_u64((uint64_t *)out, d26u64);
    out += 4;
    vst1_u64((uint64_t *)out, d27u64);
    out += 12;
    q2s16 = vsubq_s16(q1s16, q2s16);
    q3s16 = vsubq_s16(q0s16, q3s16);

    q10s16 = vld1q_s16(pass1Output);
    pass1Output += 8;
    q11s16 = vld1q_s16(pass1Output);
    pass1Output += 8;
    q12s16 = vaddq_s16(q10s16, q9s16);
    q13s16 = vaddq_s16(q11s16, q8s16);
    d24u64 = vreinterpret_u64_s16(vget_low_s16(q12s16));
    d25u64 = vreinterpret_u64_s16(vget_high_s16(q12s16));
    d26u64 = vreinterpret_u64_s16(vget_low_s16(q13s16));
    d27u64 = vreinterpret_u64_s16(vget_high_s16(q13s16));
    vst1_u64((uint64_t *)out, d24u64);
    out += 4;
    vst1_u64((uint64_t *)out, d25u64);
    out += 12;
    vst1_u64((uint64_t *)out, d26u64);
    out += 4;
    vst1_u64((uint64_t *)out, d27u64);
    out += 12;
    q8s16 = vsubq_s16(q11s16, q8s16);
    q9s16 = vsubq_s16(q10s16, q9s16);

    vst1_u64((uint64_t *)out, vreinterpret_u64_s16(vget_low_s16(q8s16)));
    out += 4;
    vst1_u64((uint64_t *)out, vreinterpret_u64_s16(vget_high_s16(q8s16)));
    out += 12;
    vst1_u64((uint64_t *)out, vreinterpret_u64_s16(vget_low_s16(q9s16)));
    out += 4;
    vst1_u64((uint64_t *)out, vreinterpret_u64_s16(vget_high_s16(q9s16)));
    out += 12;
    vst1_u64((uint64_t *)out, vreinterpret_u64_s16(vget_low_s16(q2s16)));
    out += 4;
    vst1_u64((uint64_t *)out, vreinterpret_u64_s16(vget_high_s16(q2s16)));
    out += 12;
    vst1_u64((uint64_t *)out, vreinterpret_u64_s16(vget_low_s16(q3s16)));
    out += 4;
    vst1_u64((uint64_t *)out, vreinterpret_u64_s16(vget_high_s16(q3s16)));
    out += 12;
    vst1_u64((uint64_t *)out, vreinterpret_u64_s16(vget_low_s16(q4s16)));
    out += 4;
    vst1_u64((uint64_t *)out, vreinterpret_u64_s16(vget_high_s16(q4s16)));
    out += 12;
    vst1_u64((uint64_t *)out, vreinterpret_u64_s16(vget_low_s16(q5s16)));
    out += 4;
    vst1_u64((uint64_t *)out, vreinterpret_u64_s16(vget_high_s16(q5s16)));
    out += 12;
    vst1_u64((uint64_t *)out, vreinterpret_u64_s16(vget_low_s16(q14s16)));
    out += 4;
    vst1_u64((uint64_t *)out, vreinterpret_u64_s16(vget_high_s16(q14s16)));
    out += 12;
    vst1_u64((uint64_t *)out, vreinterpret_u64_s16(vget_low_s16(q15s16)));
    out += 4;
    vst1_u64((uint64_t *)out, vreinterpret_u64_s16(vget_high_s16(q15s16)));
  }
  return;
}

void vpx_idct16x16_10_add_neon_pass1(int16_t *in, int16_t *out,
                                     int output_stride) {
  int16x4_t d4s16;
  int16x4_t d8s16, d9s16, d10s16, d11s16, d12s16, d13s16, d14s16, d15s16;
  uint64x1_t d4u64, d5u64, d18u64, d19u64, d20u64, d21u64, d22u64, d23u64;
  uint64x1_t d24u64, d25u64, d26u64, d27u64, d28u64, d29u64, d30u64, d31u64;
  int16x8_t q0s16, q1s16, q2s16, q4s16, q5s16, q6s16, q7s16;
  int16x8_t q8s16, q9s16, q10s16, q11s16, q12s16, q13s16, q14s16, q15s16;
  int32x4_t q6s32, q9s32;
  int32x4_t q10s32, q11s32, q12s32, q15s32;
  int16x8x2_t q0x2s16;

  q0x2s16 = vld2q_s16(in);
  q8s16 = q0x2s16.val[0];
  in += 16;
  q0x2s16 = vld2q_s16(in);
  q9s16 = q0x2s16.val[0];
  in += 16;
  q0x2s16 = vld2q_s16(in);
  q10s16 = q0x2s16.val[0];
  in += 16;
  q0x2s16 = vld2q_s16(in);
  q11s16 = q0x2s16.val[0];
  in += 16;
  q0x2s16 = vld2q_s16(in);
  q12s16 = q0x2s16.val[0];
  in += 16;
  q0x2s16 = vld2q_s16(in);
  q13s16 = q0x2s16.val[0];
  in += 16;
  q0x2s16 = vld2q_s16(in);
  q14s16 = q0x2s16.val[0];
  in += 16;
  q0x2s16 = vld2q_s16(in);
  q15s16 = q0x2s16.val[0];

  TRANSPOSE8X8(&q8s16, &q9s16, &q10s16, &q11s16, &q12s16, &q13s16, &q14s16,
               &q15s16);

  // stage 3
  q0s16 = vdupq_n_s16(cospi_28_64 * 2);
  q1s16 = vdupq_n_s16(cospi_4_64 * 2);

  q4s16 = vqrdmulhq_s16(q9s16, q0s16);
  q7s16 = vqrdmulhq_s16(q9s16, q1s16);

  // stage 4
  q1s16 = vdupq_n_s16(cospi_16_64 * 2);
  d4s16 = vdup_n_s16(cospi_16_64);

  q8s16 = vqrdmulhq_s16(q8s16, q1s16);

  d8s16 = vget_low_s16(q4s16);
  d9s16 = vget_high_s16(q4s16);
  d14s16 = vget_low_s16(q7s16);
  d15s16 = vget_high_s16(q7s16);
  q9s32 = vmull_s16(d14s16, d4s16);
  q10s32 = vmull_s16(d15s16, d4s16);
  q12s32 = vmull_s16(d9s16, d4s16);
  q11s32 = vmull_s16(d8s16, d4s16);

  q15s32 = vsubq_s32(q10s32, q12s32);
  q6s32 = vsubq_s32(q9s32, q11s32);
  q9s32 = vaddq_s32(q9s32, q11s32);
  q10s32 = vaddq_s32(q10s32, q12s32);

  d11s16 = vqrshrn_n_s32(q15s32, 14);
  d10s16 = vqrshrn_n_s32(q6s32, 14);
  d12s16 = vqrshrn_n_s32(q9s32, 14);
  d13s16 = vqrshrn_n_s32(q10s32, 14);
  q5s16 = vcombine_s16(d10s16, d11s16);
  q6s16 = vcombine_s16(d12s16, d13s16);

  // stage 6
  q2s16 = vaddq_s16(q8s16, q7s16);
  q9s16 = vaddq_s16(q8s16, q6s16);
  q10s16 = vaddq_s16(q8s16, q5s16);
  q11s16 = vaddq_s16(q8s16, q4s16);
  q12s16 = vsubq_s16(q8s16, q4s16);
  q13s16 = vsubq_s16(q8s16, q5s16);
  q14s16 = vsubq_s16(q8s16, q6s16);
  q15s16 = vsubq_s16(q8s16, q7s16);

  d4u64 = vreinterpret_u64_s16(vget_low_s16(q2s16));
  d5u64 = vreinterpret_u64_s16(vget_high_s16(q2s16));
  d18u64 = vreinterpret_u64_s16(vget_low_s16(q9s16));
  d19u64 = vreinterpret_u64_s16(vget_high_s16(q9s16));
  d20u64 = vreinterpret_u64_s16(vget_low_s16(q10s16));
  d21u64 = vreinterpret_u64_s16(vget_high_s16(q10s16));
  d22u64 = vreinterpret_u64_s16(vget_low_s16(q11s16));
  d23u64 = vreinterpret_u64_s16(vget_high_s16(q11s16));
  d24u64 = vreinterpret_u64_s16(vget_low_s16(q12s16));
  d25u64 = vreinterpret_u64_s16(vget_high_s16(q12s16));
  d26u64 = vreinterpret_u64_s16(vget_low_s16(q13s16));
  d27u64 = vreinterpret_u64_s16(vget_high_s16(q13s16));
  d28u64 = vreinterpret_u64_s16(vget_low_s16(q14s16));
  d29u64 = vreinterpret_u64_s16(vget_high_s16(q14s16));
  d30u64 = vreinterpret_u64_s16(vget_low_s16(q15s16));
  d31u64 = vreinterpret_u64_s16(vget_high_s16(q15s16));

  // store the data
  output_stride >>= 1;  // output_stride / 2, out is int16_t
  vst1_u64((uint64_t *)out, d4u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d5u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d18u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d19u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d20u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d21u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d22u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d23u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d24u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d25u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d26u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d27u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d28u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d29u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d30u64);
  out += output_stride;
  vst1_u64((uint64_t *)out, d31u64);
  return;
}

void vpx_idct16x16_10_add_neon_pass2(int16_t *src, int16_t *out,
                                     int16_t *pass1Output, int16_t skip_adding,
                                     uint8_t *dest, int dest_stride) {
  int16x4_t d0s16, d1s16, d2s16, d3s16, d4s16, d5s16, d6s16, d7s16;
  int16x4_t d8s16, d9s16, d10s16, d11s16, d12s16, d13s16, d14s16, d15s16;
  int16x4_t d20s16, d21s16, d22s16, d23s16;
  int16x4_t d24s16, d25s16, d26s16, d27s16, d30s16, d31s16;
  uint64x1_t d4u64, d5u64, d6u64, d7u64, d8u64, d9u64, d10u64, d11u64;
  uint64x1_t d16u64, d17u64, d18u64, d19u64;
  uint64x1_t d24u64, d25u64, d26u64, d27u64, d28u64, d29u64, d30u64, d31u64;
  int16x8_t q0s16, q1s16, q2s16, q3s16, q4s16, q5s16, q6s16, q7s16;
  int16x8_t q8s16, q9s16, q10s16, q11s16, q12s16, q13s16, q14s16, q15s16;
  int32x4_t q0s32, q1s32, q2s32, q3s32, q4s32, q5s32, q6s32, q8s32, q9s32;
  int32x4_t q10s32, q11s32, q12s32, q13s32;
  int16x8x2_t q0x2s16;
  (void)skip_adding;
  (void)dest;
  (void)dest_stride;

  q0x2s16 = vld2q_s16(src);
  q8s16 = q0x2s16.val[0];
  src += 16;
  q0x2s16 = vld2q_s16(src);
  q9s16 = q0x2s16.val[0];
  src += 16;
  q0x2s16 = vld2q_s16(src);
  q10s16 = q0x2s16.val[0];
  src += 16;
  q0x2s16 = vld2q_s16(src);
  q11s16 = q0x2s16.val[0];
  src += 16;
  q0x2s16 = vld2q_s16(src);
  q12s16 = q0x2s16.val[0];
  src += 16;
  q0x2s16 = vld2q_s16(src);
  q13s16 = q0x2s16.val[0];
  src += 16;
  q0x2s16 = vld2q_s16(src);
  q14s16 = q0x2s16.val[0];
  src += 16;
  q0x2s16 = vld2q_s16(src);
  q15s16 = q0x2s16.val[0];

  TRANSPOSE8X8(&q8s16, &q9s16, &q10s16, &q11s16, &q12s16, &q13s16, &q14s16,
               &q15s16);

  // stage 3
  q6s16 = vdupq_n_s16(cospi_30_64 * 2);
  q0s16 = vqrdmulhq_s16(q8s16, q6s16);
  q6s16 = vdupq_n_s16(cospi_2_64 * 2);
  q7s16 = vqrdmulhq_s16(q8s16, q6s16);

  q15s16 = vdupq_n_s16(-cospi_26_64 * 2);
  q14s16 = vdupq_n_s16(cospi_6_64 * 2);
  q3s16 = vqrdmulhq_s16(q9s16, q15s16);
  q4s16 = vqrdmulhq_s16(q9s16, q14s16);

  // stage 4
  d0s16 = vget_low_s16(q0s16);
  d1s16 = vget_high_s16(q0s16);
  d6s16 = vget_low_s16(q3s16);
  d7s16 = vget_high_s16(q3s16);
  d8s16 = vget_low_s16(q4s16);
  d9s16 = vget_high_s16(q4s16);
  d14s16 = vget_low_s16(q7s16);
  d15s16 = vget_high_s16(q7s16);

  d30s16 = vdup_n_s16(cospi_8_64);
  d31s16 = vdup_n_s16(cospi_24_64);

  q12s32 = vmull_s16(d14s16, d31s16);
  q5s32 = vmull_s16(d15s16, d31s16);
  q2s32 = vmull_s16(d0s16, d31s16);
  q11s32 = vmull_s16(d1s16, d31s16);

  q12s32 = vmlsl_s16(q12s32, d0s16, d30s16);
  q5s32 = vmlsl_s16(q5s32, d1s16, d30s16);
  q2s32 = vmlal_s16(q2s32, d14s16, d30s16);
  q11s32 = vmlal_s16(q11s32, d15s16, d30s16);

  d2s16 = vqrshrn_n_s32(q12s32, 14);
  d3s16 = vqrshrn_n_s32(q5s32, 14);
  d12s16 = vqrshrn_n_s32(q2s32, 14);
  d13s16 = vqrshrn_n_s32(q11s32, 14);
  q1s16 = vcombine_s16(d2s16, d3s16);
  q6s16 = vcombine_s16(d12s16, d13s16);

  d30s16 = vdup_n_s16(-cospi_8_64);
  q10s32 = vmull_s16(d8s16, d30s16);
  q13s32 = vmull_s16(d9s16, d30s16);
  q8s32 = vmull_s16(d6s16, d30s16);
  q9s32 = vmull_s16(d7s16, d30s16);

  q10s32 = vmlsl_s16(q10s32, d6s16, d31s16);
  q13s32 = vmlsl_s16(q13s32, d7s16, d31s16);
  q8s32 = vmlal_s16(q8s32, d8s16, d31s16);
  q9s32 = vmlal_s16(q9s32, d9s16, d31s16);

  d4s16 = vqrshrn_n_s32(q10s32, 14);
  d5s16 = vqrshrn_n_s32(q13s32, 14);
  d10s16 = vqrshrn_n_s32(q8s32, 14);
  d11s16 = vqrshrn_n_s32(q9s32, 14);
  q2s16 = vcombine_s16(d4s16, d5s16);
  q5s16 = vcombine_s16(d10s16, d11s16);

  // stage 5
  q8s16 = vaddq_s16(q0s16, q3s16);
  q9s16 = vaddq_s16(q1s16, q2s16);
  q10s16 = vsubq_s16(q1s16, q2s16);
  q11s16 = vsubq_s16(q0s16, q3s16);
  q12s16 = vsubq_s16(q7s16, q4s16);
  q13s16 = vsubq_s16(q6s16, q5s16);
  q14s16 = vaddq_s16(q6s16, q5s16);
  q15s16 = vaddq_s16(q7s16, q4s16);

  // stage 6
  d20s16 = vget_low_s16(q10s16);
  d21s16 = vget_high_s16(q10s16);
  d22s16 = vget_low_s16(q11s16);
  d23s16 = vget_high_s16(q11s16);
  d24s16 = vget_low_s16(q12s16);
  d25s16 = vget_high_s16(q12s16);
  d26s16 = vget_low_s16(q13s16);
  d27s16 = vget_high_s16(q13s16);

  d14s16 = vdup_n_s16(cospi_16_64);
  q3s32 = vmull_s16(d26s16, d14s16);
  q4s32 = vmull_s16(d27s16, d14s16);
  q0s32 = vmull_s16(d20s16, d14s16);
  q1s32 = vmull_s16(d21s16, d14s16);

  q5s32 = vsubq_s32(q3s32, q0s32);
  q6s32 = vsubq_s32(q4s32, q1s32);
  q0s32 = vaddq_s32(q3s32, q0s32);
  q4s32 = vaddq_s32(q4s32, q1s32);

  d4s16 = vqrshrn_n_s32(q5s32, 14);
  d5s16 = vqrshrn_n_s32(q6s32, 14);
  d10s16 = vqrshrn_n_s32(q0s32, 14);
  d11s16 = vqrshrn_n_s32(q4s32, 14);
  q2s16 = vcombine_s16(d4s16, d5s16);
  q5s16 = vcombine_s16(d10s16, d11s16);

  q0s32 = vmull_s16(d22s16, d14s16);
  q1s32 = vmull_s16(d23s16, d14s16);
  q13s32 = vmull_s16(d24s16, d14s16);
  q6s32 = vmull_s16(d25s16, d14s16);

  q10s32 = vsubq_s32(q13s32, q0s32);
  q4s32 = vsubq_s32(q6s32, q1s32);
  q13s32 = vaddq_s32(q13s32, q0s32);
  q6s32 = vaddq_s32(q6s32, q1s32);

  d6s16 = vqrshrn_n_s32(q10s32, 14);
  d7s16 = vqrshrn_n_s32(q4s32, 14);
  d8s16 = vqrshrn_n_s32(q13s32, 14);
  d9s16 = vqrshrn_n_s32(q6s32, 14);
  q3s16 = vcombine_s16(d6s16, d7s16);
  q4s16 = vcombine_s16(d8s16, d9s16);

  // stage 7
  q0s16 = vld1q_s16(pass1Output);
  pass1Output += 8;
  q1s16 = vld1q_s16(pass1Output);
  pass1Output += 8;
  q12s16 = vaddq_s16(q0s16, q15s16);
  q13s16 = vaddq_s16(q1s16, q14s16);
  d24u64 = vreinterpret_u64_s16(vget_low_s16(q12s16));
  d25u64 = vreinterpret_u64_s16(vget_high_s16(q12s16));
  d26u64 = vreinterpret_u64_s16(vget_low_s16(q13s16));
  d27u64 = vreinterpret_u64_s16(vget_high_s16(q13s16));
  vst1_u64((uint64_t *)out, d24u64);
  out += 4;
  vst1_u64((uint64_t *)out, d25u64);
  out += 12;
  vst1_u64((uint64_t *)out, d26u64);
  out += 4;
  vst1_u64((uint64_t *)out, d27u64);
  out += 12;
  q14s16 = vsubq_s16(q1s16, q14s16);
  q15s16 = vsubq_s16(q0s16, q15s16);

  q10s16 = vld1q_s16(pass1Output);
  pass1Output += 8;
  q11s16 = vld1q_s16(pass1Output);
  pass1Output += 8;
  q12s16 = vaddq_s16(q10s16, q5s16);
  q13s16 = vaddq_s16(q11s16, q4s16);
  d24u64 = vreinterpret_u64_s16(vget_low_s16(q12s16));
  d25u64 = vreinterpret_u64_s16(vget_high_s16(q12s16));
  d26u64 = vreinterpret_u64_s16(vget_low_s16(q13s16));
  d27u64 = vreinterpret_u64_s16(vget_high_s16(q13s16));
  vst1_u64((uint64_t *)out, d24u64);
  out += 4;
  vst1_u64((uint64_t *)out, d25u64);
  out += 12;
  vst1_u64((uint64_t *)out, d26u64);
  out += 4;
  vst1_u64((uint64_t *)out, d27u64);
  out += 12;
  q4s16 = vsubq_s16(q11s16, q4s16);
  q5s16 = vsubq_s16(q10s16, q5s16);

  q0s16 = vld1q_s16(pass1Output);
  pass1Output += 8;
  q1s16 = vld1q_s16(pass1Output);
  pass1Output += 8;
  q12s16 = vaddq_s16(q0s16, q3s16);
  q13s16 = vaddq_s16(q1s16, q2s16);
  d24u64 = vreinterpret_u64_s16(vget_low_s16(q12s16));
  d25u64 = vreinterpret_u64_s16(vget_high_s16(q12s16));
  d26u64 = vreinterpret_u64_s16(vget_low_s16(q13s16));
  d27u64 = vreinterpret_u64_s16(vget_high_s16(q13s16));
  vst1_u64((uint64_t *)out, d24u64);
  out += 4;
  vst1_u64((uint64_t *)out, d25u64);
  out += 12;
  vst1_u64((uint64_t *)out, d26u64);
  out += 4;
  vst1_u64((uint64_t *)out, d27u64);
  out += 12;
  q2s16 = vsubq_s16(q1s16, q2s16);
  q3s16 = vsubq_s16(q0s16, q3s16);

  q10s16 = vld1q_s16(pass1Output);
  pass1Output += 8;
  q11s16 = vld1q_s16(pass1Output);
  q12s16 = vaddq_s16(q10s16, q9s16);
  q13s16 = vaddq_s16(q11s16, q8s16);
  d24u64 = vreinterpret_u64_s16(vget_low_s16(q12s16));
  d25u64 = vreinterpret_u64_s16(vget_high_s16(q12s16));
  d26u64 = vreinterpret_u64_s16(vget_low_s16(q13s16));
  d27u64 = vreinterpret_u64_s16(vget_high_s16(q13s16));
  vst1_u64((uint64_t *)out, d24u64);
  out += 4;
  vst1_u64((uint64_t *)out, d25u64);
  out += 12;
  vst1_u64((uint64_t *)out, d26u64);
  out += 4;
  vst1_u64((uint64_t *)out, d27u64);
  out += 12;
  q8s16 = vsubq_s16(q11s16, q8s16);
  q9s16 = vsubq_s16(q10s16, q9s16);

  d4u64 = vreinterpret_u64_s16(vget_low_s16(q2s16));
  d5u64 = vreinterpret_u64_s16(vget_high_s16(q2s16));
  d6u64 = vreinterpret_u64_s16(vget_low_s16(q3s16));
  d7u64 = vreinterpret_u64_s16(vget_high_s16(q3s16));
  d8u64 = vreinterpret_u64_s16(vget_low_s16(q4s16));
  d9u64 = vreinterpret_u64_s16(vget_high_s16(q4s16));
  d10u64 = vreinterpret_u64_s16(vget_low_s16(q5s16));
  d11u64 = vreinterpret_u64_s16(vget_high_s16(q5s16));
  d16u64 = vreinterpret_u64_s16(vget_low_s16(q8s16));
  d17u64 = vreinterpret_u64_s16(vget_high_s16(q8s16));
  d18u64 = vreinterpret_u64_s16(vget_low_s16(q9s16));
  d19u64 = vreinterpret_u64_s16(vget_high_s16(q9s16));
  d28u64 = vreinterpret_u64_s16(vget_low_s16(q14s16));
  d29u64 = vreinterpret_u64_s16(vget_high_s16(q14s16));
  d30u64 = vreinterpret_u64_s16(vget_low_s16(q15s16));
  d31u64 = vreinterpret_u64_s16(vget_high_s16(q15s16));

  vst1_u64((uint64_t *)out, d16u64);
  out += 4;
  vst1_u64((uint64_t *)out, d17u64);
  out += 12;
  vst1_u64((uint64_t *)out, d18u64);
  out += 4;
  vst1_u64((uint64_t *)out, d19u64);
  out += 12;
  vst1_u64((uint64_t *)out, d4u64);
  out += 4;
  vst1_u64((uint64_t *)out, d5u64);
  out += 12;
  vst1_u64((uint64_t *)out, d6u64);
  out += 4;
  vst1_u64((uint64_t *)out, d7u64);
  out += 12;
  vst1_u64((uint64_t *)out, d8u64);
  out += 4;
  vst1_u64((uint64_t *)out, d9u64);
  out += 12;
  vst1_u64((uint64_t *)out, d10u64);
  out += 4;
  vst1_u64((uint64_t *)out, d11u64);
  out += 12;
  vst1_u64((uint64_t *)out, d28u64);
  out += 4;
  vst1_u64((uint64_t *)out, d29u64);
  out += 12;
  vst1_u64((uint64_t *)out, d30u64);
  out += 4;
  vst1_u64((uint64_t *)out, d31u64);
  return;
}