vpx/vp9/common/arm/neon/vp9_reconintra_neon.c

/*
 *  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 "./vp9_rtcd.h"
#include "./vpx_config.h"
#include "vpx/vpx_integer.h"

//------------------------------------------------------------------------------
// DC 8x8

// 'do_above' and 'do_left' facilitate branch removal when inlined.
static INLINE void dc_8x8(uint8_t *dst, ptrdiff_t stride,
                          const uint8_t *above, const uint8_t *left,
                          int do_above, int do_left) {
  uint16x8_t sum_top;
  uint16x8_t sum_left;
  uint8x8_t dc0;

  if (do_above) {
    const uint8x8_t A = vld1_u8(above);  // top row
    const uint16x4_t p0 = vpaddl_u8(A);  // cascading summation of the top
    const uint16x4_t p1 = vpadd_u16(p0, p0);
    const uint16x4_t p2 = vpadd_u16(p1, p1);
    sum_top = vcombine_u16(p2, p2);
  }

  if (do_left) {
    const uint8x8_t L = vld1_u8(left);  // left border
    const uint16x4_t p0 = vpaddl_u8(L);  // cascading summation of the left
    const uint16x4_t p1 = vpadd_u16(p0, p0);
    const uint16x4_t p2 = vpadd_u16(p1, p1);
    sum_left = vcombine_u16(p2, p2);
  }

  if (do_above && do_left) {
    const uint16x8_t sum = vaddq_u16(sum_left, sum_top);
    dc0 = vrshrn_n_u16(sum, 4);
  } else if (do_above) {
    dc0 = vrshrn_n_u16(sum_top, 3);
  } else if (do_left) {
    dc0 = vrshrn_n_u16(sum_left, 3);
  } else {
    dc0 = vdup_n_u8(0x80);
  }

  {
    const uint8x8_t dc = vdup_lane_u8(dc0, 0);
    int i;
    for (i = 0; i < 8; ++i) {
      vst1_u32((uint32_t*)(dst + i * stride), vreinterpret_u32_u8(dc));
    }
  }
}

void vp9_dc_predictor_8x8_neon(uint8_t *dst, ptrdiff_t stride,
                               const uint8_t *above, const uint8_t *left) {
  dc_8x8(dst, stride, above, left, 1, 1);
}

void vp9_dc_left_predictor_8x8_neon(uint8_t *dst, ptrdiff_t stride,
                                    const uint8_t *above, const uint8_t *left) {
  (void)above;
  dc_8x8(dst, stride, NULL, left, 0, 1);
}

void vp9_dc_top_predictor_8x8_neon(uint8_t *dst, ptrdiff_t stride,
                                   const uint8_t *above, const uint8_t *left) {
  (void)left;
  dc_8x8(dst, stride, above, NULL, 1, 0);
}

void vp9_dc_128_predictor_8x8_neon(uint8_t *dst, ptrdiff_t stride,
                                   const uint8_t *above, const uint8_t *left) {
  (void)above;
  (void)left;
  dc_8x8(dst, stride, NULL, NULL, 0, 0);
}

#if !HAVE_NEON_ASM

void vp9_v_predictor_4x4_neon(uint8_t *dst, ptrdiff_t y_stride,
                              const uint8_t *above, const uint8_t *left) {
  int i;
  uint32x2_t d0u32 = vdup_n_u32(0);
  (void)left;

  d0u32 = vld1_lane_u32((const uint32_t *)above, d0u32, 0);
  for (i = 0; i < 4; i++, dst += y_stride)
    vst1_lane_u32((uint32_t *)dst, d0u32, 0);
}

void vp9_v_predictor_8x8_neon(uint8_t *dst, ptrdiff_t y_stride,
                              const uint8_t *above, const uint8_t *left) {
  int i;
  uint8x8_t d0u8 = vdup_n_u8(0);
  (void)left;

  d0u8 = vld1_u8(above);
  for (i = 0; i < 8; i++, dst += y_stride)
    vst1_u8(dst, d0u8);
}

void vp9_v_predictor_16x16_neon(uint8_t *dst, ptrdiff_t y_stride,
                                const uint8_t *above, const uint8_t *left) {
  int i;
  uint8x16_t q0u8 = vdupq_n_u8(0);
  (void)left;

  q0u8 = vld1q_u8(above);
  for (i = 0; i < 16; i++, dst += y_stride)
    vst1q_u8(dst, q0u8);
}

void vp9_v_predictor_32x32_neon(uint8_t *dst, ptrdiff_t y_stride,
                                const uint8_t *above, const uint8_t *left) {
  int i;
  uint8x16_t q0u8 = vdupq_n_u8(0);
  uint8x16_t q1u8 = vdupq_n_u8(0);
  (void)left;

  q0u8 = vld1q_u8(above);
  q1u8 = vld1q_u8(above + 16);
  for (i = 0; i < 32; i++, dst += y_stride) {
    vst1q_u8(dst, q0u8);
    vst1q_u8(dst + 16, q1u8);
  }
}

void vp9_h_predictor_4x4_neon(uint8_t *dst, ptrdiff_t y_stride,
                              const uint8_t *above, const uint8_t *left) {
  uint8x8_t d0u8 = vdup_n_u8(0);
  uint32x2_t d1u32 = vdup_n_u32(0);
  (void)above;

  d1u32 = vld1_lane_u32((const uint32_t *)left, d1u32, 0);

  d0u8 = vdup_lane_u8(vreinterpret_u8_u32(d1u32), 0);
  vst1_lane_u32((uint32_t *)dst, vreinterpret_u32_u8(d0u8), 0);
  dst += y_stride;
  d0u8 = vdup_lane_u8(vreinterpret_u8_u32(d1u32), 1);
  vst1_lane_u32((uint32_t *)dst, vreinterpret_u32_u8(d0u8), 0);
  dst += y_stride;
  d0u8 = vdup_lane_u8(vreinterpret_u8_u32(d1u32), 2);
  vst1_lane_u32((uint32_t *)dst, vreinterpret_u32_u8(d0u8), 0);
  dst += y_stride;
  d0u8 = vdup_lane_u8(vreinterpret_u8_u32(d1u32), 3);
  vst1_lane_u32((uint32_t *)dst, vreinterpret_u32_u8(d0u8), 0);
}

void vp9_h_predictor_8x8_neon(uint8_t *dst, ptrdiff_t y_stride,
                              const uint8_t *above, const uint8_t *left) {
  uint8x8_t d0u8 = vdup_n_u8(0);
  uint64x1_t d1u64 = vdup_n_u64(0);
  (void)above;

  d1u64 = vld1_u64((const uint64_t *)left);

  d0u8 = vdup_lane_u8(vreinterpret_u8_u64(d1u64), 0);
  vst1_u8(dst, d0u8);
  dst += y_stride;
  d0u8 = vdup_lane_u8(vreinterpret_u8_u64(d1u64), 1);
  vst1_u8(dst, d0u8);
  dst += y_stride;
  d0u8 = vdup_lane_u8(vreinterpret_u8_u64(d1u64), 2);
  vst1_u8(dst, d0u8);
  dst += y_stride;
  d0u8 = vdup_lane_u8(vreinterpret_u8_u64(d1u64), 3);
  vst1_u8(dst, d0u8);
  dst += y_stride;
  d0u8 = vdup_lane_u8(vreinterpret_u8_u64(d1u64), 4);
  vst1_u8(dst, d0u8);
  dst += y_stride;
  d0u8 = vdup_lane_u8(vreinterpret_u8_u64(d1u64), 5);
  vst1_u8(dst, d0u8);
  dst += y_stride;
  d0u8 = vdup_lane_u8(vreinterpret_u8_u64(d1u64), 6);
  vst1_u8(dst, d0u8);
  dst += y_stride;
  d0u8 = vdup_lane_u8(vreinterpret_u8_u64(d1u64), 7);
  vst1_u8(dst, d0u8);
}

void vp9_h_predictor_16x16_neon(uint8_t *dst, ptrdiff_t y_stride,
                                const uint8_t *above, const uint8_t *left) {
  int j;
  uint8x8_t d2u8 = vdup_n_u8(0);
  uint8x16_t q0u8 = vdupq_n_u8(0);
  uint8x16_t q1u8 = vdupq_n_u8(0);
  (void)above;

  q1u8 = vld1q_u8(left);
  d2u8 = vget_low_u8(q1u8);
  for (j = 0; j < 2; j++, d2u8 = vget_high_u8(q1u8)) {
    q0u8 = vdupq_lane_u8(d2u8, 0);
    vst1q_u8(dst, q0u8);
    dst += y_stride;
    q0u8 = vdupq_lane_u8(d2u8, 1);
    vst1q_u8(dst, q0u8);
    dst += y_stride;
    q0u8 = vdupq_lane_u8(d2u8, 2);
    vst1q_u8(dst, q0u8);
    dst += y_stride;
    q0u8 = vdupq_lane_u8(d2u8, 3);
    vst1q_u8(dst, q0u8);
    dst += y_stride;
    q0u8 = vdupq_lane_u8(d2u8, 4);
    vst1q_u8(dst, q0u8);
    dst += y_stride;
    q0u8 = vdupq_lane_u8(d2u8, 5);
    vst1q_u8(dst, q0u8);
    dst += y_stride;
    q0u8 = vdupq_lane_u8(d2u8, 6);
    vst1q_u8(dst, q0u8);
    dst += y_stride;
    q0u8 = vdupq_lane_u8(d2u8, 7);
    vst1q_u8(dst, q0u8);
    dst += y_stride;
  }
}

void vp9_h_predictor_32x32_neon(uint8_t *dst, ptrdiff_t y_stride,
                                const uint8_t *above, const uint8_t *left) {
  int j, k;
  uint8x8_t d2u8 = vdup_n_u8(0);
  uint8x16_t q0u8 = vdupq_n_u8(0);
  uint8x16_t q1u8 = vdupq_n_u8(0);
  (void)above;

  for (k = 0; k < 2; k++, left += 16) {
    q1u8 = vld1q_u8(left);
    d2u8 = vget_low_u8(q1u8);
    for (j = 0; j < 2; j++, d2u8 = vget_high_u8(q1u8)) {
      q0u8 = vdupq_lane_u8(d2u8, 0);
      vst1q_u8(dst, q0u8);
      vst1q_u8(dst + 16, q0u8);
      dst += y_stride;
      q0u8 = vdupq_lane_u8(d2u8, 1);
      vst1q_u8(dst, q0u8);
      vst1q_u8(dst + 16, q0u8);
      dst += y_stride;
      q0u8 = vdupq_lane_u8(d2u8, 2);
      vst1q_u8(dst, q0u8);
      vst1q_u8(dst + 16, q0u8);
      dst += y_stride;
      q0u8 = vdupq_lane_u8(d2u8, 3);
      vst1q_u8(dst, q0u8);
      vst1q_u8(dst + 16, q0u8);
      dst += y_stride;
      q0u8 = vdupq_lane_u8(d2u8, 4);
      vst1q_u8(dst, q0u8);
      vst1q_u8(dst + 16, q0u8);
      dst += y_stride;
      q0u8 = vdupq_lane_u8(d2u8, 5);
      vst1q_u8(dst, q0u8);
      vst1q_u8(dst + 16, q0u8);
      dst += y_stride;
      q0u8 = vdupq_lane_u8(d2u8, 6);
      vst1q_u8(dst, q0u8);
      vst1q_u8(dst + 16, q0u8);
      dst += y_stride;
      q0u8 = vdupq_lane_u8(d2u8, 7);
      vst1q_u8(dst, q0u8);
      vst1q_u8(dst + 16, q0u8);
      dst += y_stride;
    }
  }
}

void vp9_tm_predictor_4x4_neon(uint8_t *dst, ptrdiff_t y_stride,
                               const uint8_t *above, const uint8_t *left) {
  int i;
  uint16x8_t q1u16, q3u16;
  int16x8_t q1s16;
  uint8x8_t d0u8 = vdup_n_u8(0);
  uint32x2_t d2u32 = vdup_n_u32(0);

  d0u8 = vdup_n_u8(above[-1]);
  d2u32 = vld1_lane_u32((const uint32_t *)above, d2u32, 0);
  q3u16 = vsubl_u8(vreinterpret_u8_u32(d2u32), d0u8);
  for (i = 0; i < 4; i++, dst += y_stride) {
    q1u16 = vdupq_n_u16((uint16_t)left[i]);
    q1s16 = vaddq_s16(vreinterpretq_s16_u16(q1u16),
                      vreinterpretq_s16_u16(q3u16));
    d0u8 = vqmovun_s16(q1s16);
    vst1_lane_u32((uint32_t *)dst, vreinterpret_u32_u8(d0u8), 0);
  }
}

void vp9_tm_predictor_8x8_neon(uint8_t *dst, ptrdiff_t y_stride,
                               const uint8_t *above, const uint8_t *left) {
  int j;
  uint16x8_t q0u16, q3u16, q10u16;
  int16x8_t q0s16;
  uint16x4_t d20u16;
  uint8x8_t d0u8, d2u8, d30u8;

  d0u8 = vdup_n_u8(above[-1]);
  d30u8 = vld1_u8(left);
  d2u8 = vld1_u8(above);
  q10u16 = vmovl_u8(d30u8);
  q3u16 = vsubl_u8(d2u8, d0u8);
  d20u16 = vget_low_u16(q10u16);
  for (j = 0; j < 2; j++, d20u16 = vget_high_u16(q10u16)) {
    q0u16 = vdupq_lane_u16(d20u16, 0);
    q0s16 = vaddq_s16(vreinterpretq_s16_u16(q3u16),
                      vreinterpretq_s16_u16(q0u16));
    d0u8 = vqmovun_s16(q0s16);
    vst1_u64((uint64_t *)dst, vreinterpret_u64_u8(d0u8));
    dst += y_stride;
    q0u16 = vdupq_lane_u16(d20u16, 1);
    q0s16 = vaddq_s16(vreinterpretq_s16_u16(q3u16),
                      vreinterpretq_s16_u16(q0u16));
    d0u8 = vqmovun_s16(q0s16);
    vst1_u64((uint64_t *)dst, vreinterpret_u64_u8(d0u8));
    dst += y_stride;
    q0u16 = vdupq_lane_u16(d20u16, 2);
    q0s16 = vaddq_s16(vreinterpretq_s16_u16(q3u16),
                      vreinterpretq_s16_u16(q0u16));
    d0u8 = vqmovun_s16(q0s16);
    vst1_u64((uint64_t *)dst, vreinterpret_u64_u8(d0u8));
    dst += y_stride;
    q0u16 = vdupq_lane_u16(d20u16, 3);
    q0s16 = vaddq_s16(vreinterpretq_s16_u16(q3u16),
                      vreinterpretq_s16_u16(q0u16));
    d0u8 = vqmovun_s16(q0s16);
    vst1_u64((uint64_t *)dst, vreinterpret_u64_u8(d0u8));
    dst += y_stride;
  }
}

void vp9_tm_predictor_16x16_neon(uint8_t *dst, ptrdiff_t y_stride,
                                 const uint8_t *above, const uint8_t *left) {
  int j, k;
  uint16x8_t q0u16, q2u16, q3u16, q8u16, q10u16;
  uint8x16_t q0u8, q1u8;
  int16x8_t q0s16, q1s16, q8s16, q11s16;
  uint16x4_t d20u16;
  uint8x8_t d2u8, d3u8, d18u8, d22u8, d23u8;

  q0u8 = vdupq_n_u8(above[-1]);
  q1u8 = vld1q_u8(above);
  q2u16 = vsubl_u8(vget_low_u8(q1u8), vget_low_u8(q0u8));
  q3u16 = vsubl_u8(vget_high_u8(q1u8), vget_high_u8(q0u8));
  for (k = 0; k < 2; k++, left += 8) {
    d18u8 = vld1_u8(left);
    q10u16 = vmovl_u8(d18u8);
    d20u16 = vget_low_u16(q10u16);
    for (j = 0; j < 2; j++, d20u16 = vget_high_u16(q10u16)) {
      q0u16 = vdupq_lane_u16(d20u16, 0);
      q8u16 = vdupq_lane_u16(d20u16, 1);
      q1s16 = vaddq_s16(vreinterpretq_s16_u16(q0u16),
                        vreinterpretq_s16_u16(q2u16));
      q0s16 = vaddq_s16(vreinterpretq_s16_u16(q0u16),
                        vreinterpretq_s16_u16(q3u16));
      q11s16 = vaddq_s16(vreinterpretq_s16_u16(q8u16),
                         vreinterpretq_s16_u16(q2u16));
      q8s16 = vaddq_s16(vreinterpretq_s16_u16(q8u16),
                        vreinterpretq_s16_u16(q3u16));
      d2u8 = vqmovun_s16(q1s16);
      d3u8 = vqmovun_s16(q0s16);
      d22u8 = vqmovun_s16(q11s16);
      d23u8 = vqmovun_s16(q8s16);
      vst1_u64((uint64_t *)dst, vreinterpret_u64_u8(d2u8));
      vst1_u64((uint64_t *)(dst + 8), vreinterpret_u64_u8(d3u8));
      dst += y_stride;
      vst1_u64((uint64_t *)dst, vreinterpret_u64_u8(d22u8));
      vst1_u64((uint64_t *)(dst + 8), vreinterpret_u64_u8(d23u8));
      dst += y_stride;

      q0u16 = vdupq_lane_u16(d20u16, 2);
      q8u16 = vdupq_lane_u16(d20u16, 3);
      q1s16 = vaddq_s16(vreinterpretq_s16_u16(q0u16),
                        vreinterpretq_s16_u16(q2u16));
      q0s16 = vaddq_s16(vreinterpretq_s16_u16(q0u16),
                        vreinterpretq_s16_u16(q3u16));
      q11s16 = vaddq_s16(vreinterpretq_s16_u16(q8u16),
                         vreinterpretq_s16_u16(q2u16));
      q8s16 = vaddq_s16(vreinterpretq_s16_u16(q8u16),
                        vreinterpretq_s16_u16(q3u16));
      d2u8 = vqmovun_s16(q1s16);
      d3u8 = vqmovun_s16(q0s16);
      d22u8 = vqmovun_s16(q11s16);
      d23u8 = vqmovun_s16(q8s16);
      vst1_u64((uint64_t *)dst, vreinterpret_u64_u8(d2u8));
      vst1_u64((uint64_t *)(dst + 8), vreinterpret_u64_u8(d3u8));
      dst += y_stride;
      vst1_u64((uint64_t *)dst, vreinterpret_u64_u8(d22u8));
      vst1_u64((uint64_t *)(dst + 8), vreinterpret_u64_u8(d23u8));
      dst += y_stride;
    }
  }
}

void vp9_tm_predictor_32x32_neon(uint8_t *dst, ptrdiff_t y_stride,
                                 const uint8_t *above, const uint8_t *left) {
  int j, k;
  uint16x8_t q0u16, q3u16, q8u16, q9u16, q10u16, q11u16;
  uint8x16_t q0u8, q1u8, q2u8;
  int16x8_t q12s16, q13s16, q14s16, q15s16;
  uint16x4_t d6u16;
  uint8x8_t d0u8, d1u8, d2u8, d3u8, d26u8;

  q0u8 = vdupq_n_u8(above[-1]);
  q1u8 = vld1q_u8(above);
  q2u8 = vld1q_u8(above + 16);
  q8u16 = vsubl_u8(vget_low_u8(q1u8), vget_low_u8(q0u8));
  q9u16 = vsubl_u8(vget_high_u8(q1u8), vget_high_u8(q0u8));
  q10u16 = vsubl_u8(vget_low_u8(q2u8), vget_low_u8(q0u8));
  q11u16 = vsubl_u8(vget_high_u8(q2u8), vget_high_u8(q0u8));
  for (k = 0; k < 4; k++, left += 8) {
    d26u8 = vld1_u8(left);
    q3u16 = vmovl_u8(d26u8);
    d6u16 = vget_low_u16(q3u16);
    for (j = 0; j < 2; j++, d6u16 = vget_high_u16(q3u16)) {
      q0u16 = vdupq_lane_u16(d6u16, 0);
      q12s16 = vaddq_s16(vreinterpretq_s16_u16(q0u16),
                         vreinterpretq_s16_u16(q8u16));
      q13s16 = vaddq_s16(vreinterpretq_s16_u16(q0u16),
                         vreinterpretq_s16_u16(q9u16));
      q14s16 = vaddq_s16(vreinterpretq_s16_u16(q0u16),
                         vreinterpretq_s16_u16(q10u16));
      q15s16 = vaddq_s16(vreinterpretq_s16_u16(q0u16),
                         vreinterpretq_s16_u16(q11u16));
      d0u8 = vqmovun_s16(q12s16);
      d1u8 = vqmovun_s16(q13s16);
      d2u8 = vqmovun_s16(q14s16);
      d3u8 = vqmovun_s16(q15s16);
      q0u8 = vcombine_u8(d0u8, d1u8);
      q1u8 = vcombine_u8(d2u8, d3u8);
      vst1q_u64((uint64_t *)dst, vreinterpretq_u64_u8(q0u8));
      vst1q_u64((uint64_t *)(dst + 16), vreinterpretq_u64_u8(q1u8));
      dst += y_stride;

      q0u16 = vdupq_lane_u16(d6u16, 1);
      q12s16 = vaddq_s16(vreinterpretq_s16_u16(q0u16),
                         vreinterpretq_s16_u16(q8u16));
      q13s16 = vaddq_s16(vreinterpretq_s16_u16(q0u16),
                         vreinterpretq_s16_u16(q9u16));
      q14s16 = vaddq_s16(vreinterpretq_s16_u16(q0u16),
                         vreinterpretq_s16_u16(q10u16));
      q15s16 = vaddq_s16(vreinterpretq_s16_u16(q0u16),
                         vreinterpretq_s16_u16(q11u16));
      d0u8 = vqmovun_s16(q12s16);
      d1u8 = vqmovun_s16(q13s16);
      d2u8 = vqmovun_s16(q14s16);
      d3u8 = vqmovun_s16(q15s16);
      q0u8 = vcombine_u8(d0u8, d1u8);
      q1u8 = vcombine_u8(d2u8, d3u8);
      vst1q_u64((uint64_t *)dst, vreinterpretq_u64_u8(q0u8));
      vst1q_u64((uint64_t *)(dst + 16), vreinterpretq_u64_u8(q1u8));
      dst += y_stride;

      q0u16 = vdupq_lane_u16(d6u16, 2);
      q12s16 = vaddq_s16(vreinterpretq_s16_u16(q0u16),
                         vreinterpretq_s16_u16(q8u16));
      q13s16 = vaddq_s16(vreinterpretq_s16_u16(q0u16),
                         vreinterpretq_s16_u16(q9u16));
      q14s16 = vaddq_s16(vreinterpretq_s16_u16(q0u16),
                         vreinterpretq_s16_u16(q10u16));
      q15s16 = vaddq_s16(vreinterpretq_s16_u16(q0u16),
                         vreinterpretq_s16_u16(q11u16));
      d0u8 = vqmovun_s16(q12s16);
      d1u8 = vqmovun_s16(q13s16);
      d2u8 = vqmovun_s16(q14s16);
      d3u8 = vqmovun_s16(q15s16);
      q0u8 = vcombine_u8(d0u8, d1u8);
      q1u8 = vcombine_u8(d2u8, d3u8);
      vst1q_u64((uint64_t *)dst, vreinterpretq_u64_u8(q0u8));
      vst1q_u64((uint64_t *)(dst + 16), vreinterpretq_u64_u8(q1u8));
      dst += y_stride;

      q0u16 = vdupq_lane_u16(d6u16, 3);
      q12s16 = vaddq_s16(vreinterpretq_s16_u16(q0u16),
                         vreinterpretq_s16_u16(q8u16));
      q13s16 = vaddq_s16(vreinterpretq_s16_u16(q0u16),
                         vreinterpretq_s16_u16(q9u16));
      q14s16 = vaddq_s16(vreinterpretq_s16_u16(q0u16),
                         vreinterpretq_s16_u16(q10u16));
      q15s16 = vaddq_s16(vreinterpretq_s16_u16(q0u16),
                         vreinterpretq_s16_u16(q11u16));
      d0u8 = vqmovun_s16(q12s16);
      d1u8 = vqmovun_s16(q13s16);
      d2u8 = vqmovun_s16(q14s16);
      d3u8 = vqmovun_s16(q15s16);
      q0u8 = vcombine_u8(d0u8, d1u8);
      q1u8 = vcombine_u8(d2u8, d3u8);
      vst1q_u64((uint64_t *)dst, vreinterpretq_u64_u8(q0u8));
      vst1q_u64((uint64_t *)(dst + 16), vreinterpretq_u64_u8(q1u8));
      dst += y_stride;
    }
  }
}
#endif  // !HAVE_NEON_ASM