aom_dsp/arm/aom_convolve8_neon.c - aom - Git at Google

 /*
  * Copyright (c) 2014 The WebM project authors. All rights reserved.
  * Copyright (c) 2023, Alliance for Open Media. All rights reserved.
  *
  * This source code is subject to the terms of the BSD 2 Clause License and
  * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
  * was not distributed with this source code in the LICENSE file, you can
  * obtain it at www.aomedia.org/license/software. If the Alliance for Open
  * Media Patent License 1.0 was not distributed with this source code in the
  * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
  */

 #include <arm_neon.h>
 #include <assert.h>
 #include <string.h>

 #include "config/aom_config.h"
 #include "config/aom_dsp_rtcd.h"

 #include "aom/aom_integer.h"
 #include "aom_dsp/aom_dsp_common.h"
 #include "aom_dsp/aom_filter.h"
 #include "aom_dsp/arm/aom_convolve8_neon.h"
 #include "aom_dsp/arm/aom_filter.h"
 #include "aom_dsp/arm/mem_neon.h"
 #include "aom_dsp/arm/transpose_neon.h"
 #include "aom_ports/mem.h"

 static INLINE int16x4_t convolve8_4(const int16x4_t s0, const int16x4_t s1,
                                     const int16x4_t s2, const int16x4_t s3,
                                     const int16x4_t s4, const int16x4_t s5,
                                     const int16x4_t s6, const int16x4_t s7,
                                     const int16x8_t filter) {
   const int16x4_t filter_lo = vget_low_s16(filter);
   const int16x4_t filter_hi = vget_high_s16(filter);

   int16x4_t sum = vmul_lane_s16(s0, filter_lo, 0);
   sum = vmla_lane_s16(sum, s1, filter_lo, 1);
   sum = vmla_lane_s16(sum, s2, filter_lo, 2);
   sum = vmla_lane_s16(sum, s5, filter_hi, 1);
   sum = vmla_lane_s16(sum, s6, filter_hi, 2);
   sum = vmla_lane_s16(sum, s7, filter_hi, 3);

   sum = vqadd_s16(sum, vmul_lane_s16(s3, filter_lo, 3));
   sum = vqadd_s16(sum, vmul_lane_s16(s4, filter_hi, 0));
   return sum;
 }

 static INLINE uint8x8_t convolve8_8(const int16x8_t s0, const int16x8_t s1,
                                     const int16x8_t s2, const int16x8_t s3,
                                     const int16x8_t s4, const int16x8_t s5,
                                     const int16x8_t s6, const int16x8_t s7,
                                     const int16x8_t filter) {
   const int16x4_t filter_lo = vget_low_s16(filter);
   const int16x4_t filter_hi = vget_high_s16(filter);

   int16x8_t sum = vmulq_lane_s16(s0, filter_lo, 0);
   sum = vmlaq_lane_s16(sum, s1, filter_lo, 1);
   sum = vmlaq_lane_s16(sum, s2, filter_lo, 2);
   sum = vmlaq_lane_s16(sum, s5, filter_hi, 1);
   sum = vmlaq_lane_s16(sum, s6, filter_hi, 2);
   sum = vmlaq_lane_s16(sum, s7, filter_hi, 3);

   sum = vqaddq_s16(sum, vmulq_lane_s16(s3, filter_lo, 3));
   sum = vqaddq_s16(sum, vmulq_lane_s16(s4, filter_hi, 0));
   return vqrshrun_n_s16(sum, FILTER_BITS);
 }

 static INLINE void convolve8_horiz_8tap_neon(const uint8_t *src,
                                              ptrdiff_t src_stride, uint8_t *dst,
                                              ptrdiff_t dst_stride,
                                              const int16_t *filter_x, int w,
                                              int h) {
   const int16x8_t filter = vld1q_s16(filter_x);

   if (h == 4) {
     uint8x8_t t0, t1, t2, t3;
     load_u8_8x4(src, src_stride, &t0, &t1, &t2, &t3);
     transpose_elems_inplace_u8_8x4(&t0, &t1, &t2, &t3);

     int16x4_t s0 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t0)));
     int16x4_t s1 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t1)));
     int16x4_t s2 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t2)));
     int16x4_t s3 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t3)));
     int16x4_t s4 = vget_high_s16(vreinterpretq_s16_u16(vmovl_u8(t0)));
     int16x4_t s5 = vget_high_s16(vreinterpretq_s16_u16(vmovl_u8(t1)));
     int16x4_t s6 = vget_high_s16(vreinterpretq_s16_u16(vmovl_u8(t2)));

     src += 7;

     do {
       load_u8_8x4(src, src_stride, &t0, &t1, &t2, &t3);
       transpose_elems_inplace_u8_8x4(&t0, &t1, &t2, &t3);

       int16x4_t s7 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t0)));
       int16x4_t s8 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t1)));
       int16x4_t s9 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t2)));
       int16x4_t s10 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t3)));

       int16x4_t d0 = convolve8_4(s0, s1, s2, s3, s4, s5, s6, s7, filter);
       int16x4_t d1 = convolve8_4(s1, s2, s3, s4, s5, s6, s7, s8, filter);
       int16x4_t d2 = convolve8_4(s2, s3, s4, s5, s6, s7, s8, s9, filter);
       int16x4_t d3 = convolve8_4(s3, s4, s5, s6, s7, s8, s9, s10, filter);
       uint8x8_t d01 = vqrshrun_n_s16(vcombine_s16(d0, d1), FILTER_BITS);
       uint8x8_t d23 = vqrshrun_n_s16(vcombine_s16(d2, d3), FILTER_BITS);

       transpose_elems_inplace_u8_4x4(&d01, &d23);

       store_u8x4_strided_x2(dst + 0 * dst_stride, 2 * dst_stride, d01);
       store_u8x4_strided_x2(dst + 1 * dst_stride, 2 * dst_stride, d23);

       s0 = s4;
       s1 = s5;
       s2 = s6;
       s3 = s7;
       s4 = s8;
       s5 = s9;
       s6 = s10;

       src += 4;
       dst += 4;
       w -= 4;
     } while (w != 0);
   } else {
     if (w == 4) {
       do {
         uint8x8_t t0, t1, t2, t3, t4, t5, t6, t7;
         load_u8_8x8(src, src_stride, &t0, &t1, &t2, &t3, &t4, &t5, &t6, &t7);
         transpose_elems_inplace_u8_8x8(&t0, &t1, &t2, &t3, &t4, &t5, &t6, &t7);

         int16x8_t s0 = vreinterpretq_s16_u16(vmovl_u8(t0));
         int16x8_t s1 = vreinterpretq_s16_u16(vmovl_u8(t1));
         int16x8_t s2 = vreinterpretq_s16_u16(vmovl_u8(t2));
         int16x8_t s3 = vreinterpretq_s16_u16(vmovl_u8(t3));
         int16x8_t s4 = vreinterpretq_s16_u16(vmovl_u8(t4));
         int16x8_t s5 = vreinterpretq_s16_u16(vmovl_u8(t5));
         int16x8_t s6 = vreinterpretq_s16_u16(vmovl_u8(t6));

         load_u8_8x8(src + 7, src_stride, &t0, &t1, &t2, &t3, &t4, &t5, &t6,
                     &t7);
         transpose_elems_u8_4x8(t0, t1, t2, t3, t4, t5, t6, t7, &t0, &t1, &t2,
                                &t3);

         int16x8_t s7 = vreinterpretq_s16_u16(vmovl_u8(t0));
         int16x8_t s8 = vreinterpretq_s16_u16(vmovl_u8(t1));
         int16x8_t s9 = vreinterpretq_s16_u16(vmovl_u8(t2));
         int16x8_t s10 = vreinterpretq_s16_u16(vmovl_u8(t3));

         uint8x8_t d0 = convolve8_8(s0, s1, s2, s3, s4, s5, s6, s7, filter);
         uint8x8_t d1 = convolve8_8(s1, s2, s3, s4, s5, s6, s7, s8, filter);
         uint8x8_t d2 = convolve8_8(s2, s3, s4, s5, s6, s7, s8, s9, filter);
         uint8x8_t d3 = convolve8_8(s3, s4, s5, s6, s7, s8, s9, s10, filter);

         transpose_elems_inplace_u8_8x4(&d0, &d1, &d2, &d3);

         store_u8x4_strided_x2(dst + 0 * dst_stride, 4 * dst_stride, d0);
         store_u8x4_strided_x2(dst + 1 * dst_stride, 4 * dst_stride, d1);
         store_u8x4_strided_x2(dst + 2 * dst_stride, 4 * dst_stride, d2);
         store_u8x4_strided_x2(dst + 3 * dst_stride, 4 * dst_stride, d3);

         src += 8 * src_stride;
         dst += 8 * dst_stride;
         h -= 8;
       } while (h > 0);
     } else {
       do {
         int width = w;
         const uint8_t *s = src;
         uint8_t *d = dst;

         uint8x8_t t0, t1, t2, t3, t4, t5, t6, t7;
         load_u8_8x8(s, src_stride, &t0, &t1, &t2, &t3, &t4, &t5, &t6, &t7);
         transpose_elems_inplace_u8_8x8(&t0, &t1, &t2, &t3, &t4, &t5, &t6, &t7);

         int16x8_t s0 = vreinterpretq_s16_u16(vmovl_u8(t0));
         int16x8_t s1 = vreinterpretq_s16_u16(vmovl_u8(t1));
         int16x8_t s2 = vreinterpretq_s16_u16(vmovl_u8(t2));
         int16x8_t s3 = vreinterpretq_s16_u16(vmovl_u8(t3));
         int16x8_t s4 = vreinterpretq_s16_u16(vmovl_u8(t4));
         int16x8_t s5 = vreinterpretq_s16_u16(vmovl_u8(t5));
         int16x8_t s6 = vreinterpretq_s16_u16(vmovl_u8(t6));

         s += 7;

         do {
           load_u8_8x8(s, src_stride, &t0, &t1, &t2, &t3, &t4, &t5, &t6, &t7);
           transpose_elems_inplace_u8_8x8(&t0, &t1, &t2, &t3, &t4, &t5, &t6,
                                          &t7);

           int16x8_t s7 = vreinterpretq_s16_u16(vmovl_u8(t0));
           int16x8_t s8 = vreinterpretq_s16_u16(vmovl_u8(t1));
           int16x8_t s9 = vreinterpretq_s16_u16(vmovl_u8(t2));
           int16x8_t s10 = vreinterpretq_s16_u16(vmovl_u8(t3));
           int16x8_t s11 = vreinterpretq_s16_u16(vmovl_u8(t4));
           int16x8_t s12 = vreinterpretq_s16_u16(vmovl_u8(t5));
           int16x8_t s13 = vreinterpretq_s16_u16(vmovl_u8(t6));
           int16x8_t s14 = vreinterpretq_s16_u16(vmovl_u8(t7));

           uint8x8_t d0 = convolve8_8(s0, s1, s2, s3, s4, s5, s6, s7, filter);
           uint8x8_t d1 = convolve8_8(s1, s2, s3, s4, s5, s6, s7, s8, filter);
           uint8x8_t d2 = convolve8_8(s2, s3, s4, s5, s6, s7, s8, s9, filter);
           uint8x8_t d3 = convolve8_8(s3, s4, s5, s6, s7, s8, s9, s10, filter);
           uint8x8_t d4 = convolve8_8(s4, s5, s6, s7, s8, s9, s10, s11, filter);
           uint8x8_t d5 = convolve8_8(s5, s6, s7, s8, s9, s10, s11, s12, filter);
           uint8x8_t d6 =
               convolve8_8(s6, s7, s8, s9, s10, s11, s12, s13, filter);
           uint8x8_t d7 =
               convolve8_8(s7, s8, s9, s10, s11, s12, s13, s14, filter);

           transpose_elems_inplace_u8_8x8(&d0, &d1, &d2, &d3, &d4, &d5, &d6,
                                          &d7);

           store_u8_8x8(d, dst_stride, d0, d1, d2, d3, d4, d5, d6, d7);

           s0 = s8;
           s1 = s9;
           s2 = s10;
           s3 = s11;
           s4 = s12;
           s5 = s13;
           s6 = s14;

           s += 8;
           d += 8;
           width -= 8;
         } while (width != 0);
         src += 8 * src_stride;
         dst += 8 * dst_stride;
         h -= 8;
       } while (h > 0);
     }
   }
 }

 static INLINE void convolve8_horiz_4tap_neon(const uint8_t *src,
                                              ptrdiff_t src_stride, uint8_t *dst,
                                              ptrdiff_t dst_stride,
                                              const int16_t *filter_x, int w,
                                              int h) {
   // All filter values are even, halve to reduce intermediate precision
   // requirements.
   const int16x4_t filter = vshr_n_s16(vld1_s16(filter_x + 2), 1);

   if (w == 4) {
     do {
       uint8x8_t t01[4];

       t01[0] = load_unaligned_u8(src + 0, (int)src_stride);
       t01[1] = load_unaligned_u8(src + 1, (int)src_stride);
       t01[2] = load_unaligned_u8(src + 2, (int)src_stride);
       t01[3] = load_unaligned_u8(src + 3, (int)src_stride);

       int16x8_t s01[4];
       s01[0] = vreinterpretq_s16_u16(vmovl_u8(t01[0]));
       s01[1] = vreinterpretq_s16_u16(vmovl_u8(t01[1]));
       s01[2] = vreinterpretq_s16_u16(vmovl_u8(t01[2]));
       s01[3] = vreinterpretq_s16_u16(vmovl_u8(t01[3]));

       uint8x8_t d01 = convolve4_8(s01[0], s01[1], s01[2], s01[3], filter);

       store_u8x4_strided_x2(dst + 0 * dst_stride, dst_stride, d01);

       src += 2 * src_stride;
       dst += 2 * dst_stride;
       h -= 2;
     } while (h > 0);
   } else {
     do {
       int width = w;
       const uint8_t *s = src;
       uint8_t *d = dst;

       do {
         uint8x8_t t0[4], t1[4];
         load_u8_8x4(s + 0 * src_stride, 1, &t0[0], &t0[1], &t0[2], &t0[3]);
         load_u8_8x4(s + 1 * src_stride, 1, &t1[0], &t1[1], &t1[2], &t1[3]);

         int16x8_t s0[4], s1[4];
         s0[0] = vreinterpretq_s16_u16(vmovl_u8(t0[0]));
         s0[1] = vreinterpretq_s16_u16(vmovl_u8(t0[1]));
         s0[2] = vreinterpretq_s16_u16(vmovl_u8(t0[2]));
         s0[3] = vreinterpretq_s16_u16(vmovl_u8(t0[3]));

         s1[0] = vreinterpretq_s16_u16(vmovl_u8(t1[0]));
         s1[1] = vreinterpretq_s16_u16(vmovl_u8(t1[1]));
         s1[2] = vreinterpretq_s16_u16(vmovl_u8(t1[2]));
         s1[3] = vreinterpretq_s16_u16(vmovl_u8(t1[3]));

         uint8x8_t d0 = convolve4_8(s0[0], s0[1], s0[2], s0[3], filter);
         uint8x8_t d1 = convolve4_8(s1[0], s1[1], s1[2], s1[3], filter);

         store_u8_8x2(d, dst_stride, d0, d1);

         s += 8;
         d += 8;
         width -= 8;
       } while (width != 0);
       src += 2 * src_stride;
       dst += 2 * dst_stride;
       h -= 2;
     } while (h > 0);
   }
 }

 void aom_convolve8_horiz_neon(const uint8_t *src, ptrdiff_t src_stride,
                               uint8_t *dst, ptrdiff_t dst_stride,
                               const int16_t *filter_x, int x_step_q4,
                               const int16_t *filter_y, int y_step_q4, int w,
                               int h) {
   assert((intptr_t)dst % 4 == 0);
   assert(dst_stride % 4 == 0);

   (void)x_step_q4;
   (void)filter_y;
   (void)y_step_q4;

   src -= ((SUBPEL_TAPS / 2) - 1);

   int filter_taps = get_filter_taps_convolve8(filter_x);

   if (filter_taps == 2) {
     convolve8_horiz_2tap_neon(src + 3, src_stride, dst, dst_stride, filter_x, w,
                               h);
   } else if (filter_taps == 4) {
     convolve8_horiz_4tap_neon(src + 2, src_stride, dst, dst_stride, filter_x, w,
                               h);
   } else {
     convolve8_horiz_8tap_neon(src, src_stride, dst, dst_stride, filter_x, w, h);
   }
 }

 static INLINE void convolve8_vert_8tap_neon(const uint8_t *src,
                                             ptrdiff_t src_stride, uint8_t *dst,
                                             ptrdiff_t dst_stride,
                                             const int16_t *filter_y, int w,
                                             int h) {
   const int16x8_t filter = vld1q_s16(filter_y);

   if (w == 4) {
     uint8x8_t t0, t1, t2, t3, t4, t5, t6;
     load_u8_8x7(src, src_stride, &t0, &t1, &t2, &t3, &t4, &t5, &t6);

     int16x4_t s0 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t0)));
     int16x4_t s1 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t1)));
     int16x4_t s2 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t2)));
     int16x4_t s3 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t3)));
     int16x4_t s4 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t4)));
     int16x4_t s5 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t5)));
     int16x4_t s6 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t6)));

     src += 7 * src_stride;

     do {
       load_u8_8x4(src, src_stride, &t0, &t1, &t2, &t3);

       int16x4_t s7 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t0)));
       int16x4_t s8 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t1)));
       int16x4_t s9 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t2)));
       int16x4_t s10 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t3)));

       int16x4_t d0 = convolve8_4(s0, s1, s2, s3, s4, s5, s6, s7, filter);
       int16x4_t d1 = convolve8_4(s1, s2, s3, s4, s5, s6, s7, s8, filter);
       int16x4_t d2 = convolve8_4(s2, s3, s4, s5, s6, s7, s8, s9, filter);
       int16x4_t d3 = convolve8_4(s3, s4, s5, s6, s7, s8, s9, s10, filter);
       uint8x8_t d01 = vqrshrun_n_s16(vcombine_s16(d0, d1), FILTER_BITS);
       uint8x8_t d23 = vqrshrun_n_s16(vcombine_s16(d2, d3), FILTER_BITS);

       store_u8x4_strided_x2(dst + 0 * dst_stride, dst_stride, d01);
       store_u8x4_strided_x2(dst + 2 * dst_stride, dst_stride, d23);

       s0 = s4;
       s1 = s5;
       s2 = s6;
       s3 = s7;
       s4 = s8;
       s5 = s9;
       s6 = s10;

       src += 4 * src_stride;
       dst += 4 * dst_stride;
       h -= 4;
     } while (h != 0);
   } else {
     do {
       uint8x8_t t0, t1, t2, t3, t4, t5, t6;
       load_u8_8x7(src, src_stride, &t0, &t1, &t2, &t3, &t4, &t5, &t6);

       int16x8_t s0 = vreinterpretq_s16_u16(vmovl_u8(t0));
       int16x8_t s1 = vreinterpretq_s16_u16(vmovl_u8(t1));
       int16x8_t s2 = vreinterpretq_s16_u16(vmovl_u8(t2));
       int16x8_t s3 = vreinterpretq_s16_u16(vmovl_u8(t3));
       int16x8_t s4 = vreinterpretq_s16_u16(vmovl_u8(t4));
       int16x8_t s5 = vreinterpretq_s16_u16(vmovl_u8(t5));
       int16x8_t s6 = vreinterpretq_s16_u16(vmovl_u8(t6));

       int height = h;
       const uint8_t *s = src + 7 * src_stride;
       uint8_t *d = dst;

       do {
         load_u8_8x4(s, src_stride, &t0, &t1, &t2, &t3);

         int16x8_t s7 = vreinterpretq_s16_u16(vmovl_u8(t0));
         int16x8_t s8 = vreinterpretq_s16_u16(vmovl_u8(t1));
         int16x8_t s9 = vreinterpretq_s16_u16(vmovl_u8(t2));
         int16x8_t s10 = vreinterpretq_s16_u16(vmovl_u8(t3));

         uint8x8_t d0 = convolve8_8(s0, s1, s2, s3, s4, s5, s6, s7, filter);
         uint8x8_t d1 = convolve8_8(s1, s2, s3, s4, s5, s6, s7, s8, filter);
         uint8x8_t d2 = convolve8_8(s2, s3, s4, s5, s6, s7, s8, s9, filter);
         uint8x8_t d3 = convolve8_8(s3, s4, s5, s6, s7, s8, s9, s10, filter);

         store_u8_8x4(d, dst_stride, d0, d1, d2, d3);

         s0 = s4;
         s1 = s5;
         s2 = s6;
         s3 = s7;
         s4 = s8;
         s5 = s9;
         s6 = s10;

         s += 4 * src_stride;
         d += 4 * dst_stride;
         height -= 4;
       } while (height != 0);
       src += 8;
       dst += 8;
       w -= 8;
     } while (w != 0);
   }
 }

 void aom_convolve8_vert_neon(const uint8_t *src, ptrdiff_t src_stride,
                              uint8_t *dst, ptrdiff_t dst_stride,
                              const int16_t *filter_x, int x_step_q4,
                              const int16_t *filter_y, int y_step_q4, int w,
                              int h) {
   assert((intptr_t)dst % 4 == 0);
   assert(dst_stride % 4 == 0);

   (void)filter_x;
   (void)x_step_q4;
   (void)y_step_q4;

   src -= ((SUBPEL_TAPS / 2) - 1) * src_stride;

   int filter_taps = get_filter_taps_convolve8(filter_y);

   if (filter_taps == 2) {
     convolve8_vert_2tap_neon(src + 3 * src_stride, src_stride, dst, dst_stride,
                              filter_y, w, h);
   } else if (filter_taps == 4) {
     convolve8_vert_4tap_neon(src + 2 * src_stride, src_stride, dst, dst_stride,
                              filter_y, w, h);
   } else {
     convolve8_vert_8tap_neon(src, src_stride, dst, dst_stride, filter_y, w, h);
   }
 }
	/*
	* Copyright (c) 2014 The WebM project authors. All rights reserved.
	* Copyright (c) 2023, Alliance for Open Media. All rights reserved.
	*
	* This source code is subject to the terms of the BSD 2 Clause License and
	* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
	* was not distributed with this source code in the LICENSE file, you can
	* obtain it at www.aomedia.org/license/software. If the Alliance for Open
	* Media Patent License 1.0 was not distributed with this source code in the
	* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
	*/

	#include <arm_neon.h>
	#include <assert.h>
	#include <string.h>

	#include "config/aom_config.h"
	#include "config/aom_dsp_rtcd.h"

	#include "aom/aom_integer.h"
	#include "aom_dsp/aom_dsp_common.h"
	#include "aom_dsp/aom_filter.h"
	#include "aom_dsp/arm/aom_convolve8_neon.h"
	#include "aom_dsp/arm/aom_filter.h"
	#include "aom_dsp/arm/mem_neon.h"
	#include "aom_dsp/arm/transpose_neon.h"
	#include "aom_ports/mem.h"

	static INLINE int16x4_t convolve8_4(const int16x4_t s0, const int16x4_t s1,
	const int16x4_t s2, const int16x4_t s3,
	const int16x4_t s4, const int16x4_t s5,
	const int16x4_t s6, const int16x4_t s7,
	const int16x8_t filter) {
	const int16x4_t filter_lo = vget_low_s16(filter);
	const int16x4_t filter_hi = vget_high_s16(filter);

	int16x4_t sum = vmul_lane_s16(s0, filter_lo, 0);
	sum = vmla_lane_s16(sum, s1, filter_lo, 1);
	sum = vmla_lane_s16(sum, s2, filter_lo, 2);
	sum = vmla_lane_s16(sum, s5, filter_hi, 1);
	sum = vmla_lane_s16(sum, s6, filter_hi, 2);
	sum = vmla_lane_s16(sum, s7, filter_hi, 3);

	sum = vqadd_s16(sum, vmul_lane_s16(s3, filter_lo, 3));
	sum = vqadd_s16(sum, vmul_lane_s16(s4, filter_hi, 0));
	return sum;
	}

	static INLINE uint8x8_t convolve8_8(const int16x8_t s0, const int16x8_t s1,
	const int16x8_t s2, const int16x8_t s3,
	const int16x8_t s4, const int16x8_t s5,
	const int16x8_t s6, const int16x8_t s7,
	const int16x8_t filter) {
	const int16x4_t filter_lo = vget_low_s16(filter);
	const int16x4_t filter_hi = vget_high_s16(filter);

	int16x8_t sum = vmulq_lane_s16(s0, filter_lo, 0);
	sum = vmlaq_lane_s16(sum, s1, filter_lo, 1);
	sum = vmlaq_lane_s16(sum, s2, filter_lo, 2);
	sum = vmlaq_lane_s16(sum, s5, filter_hi, 1);
	sum = vmlaq_lane_s16(sum, s6, filter_hi, 2);
	sum = vmlaq_lane_s16(sum, s7, filter_hi, 3);

	sum = vqaddq_s16(sum, vmulq_lane_s16(s3, filter_lo, 3));
	sum = vqaddq_s16(sum, vmulq_lane_s16(s4, filter_hi, 0));
	return vqrshrun_n_s16(sum, FILTER_BITS);
	}

	static INLINE void convolve8_horiz_8tap_neon(const uint8_t *src,
	ptrdiff_t src_stride, uint8_t *dst,
	ptrdiff_t dst_stride,
	const int16_t *filter_x, int w,
	int h) {
	const int16x8_t filter = vld1q_s16(filter_x);

	if (h == 4) {
	uint8x8_t t0, t1, t2, t3;
	load_u8_8x4(src, src_stride, &t0, &t1, &t2, &t3);
	transpose_elems_inplace_u8_8x4(&t0, &t1, &t2, &t3);

	int16x4_t s0 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t0)));
	int16x4_t s1 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t1)));
	int16x4_t s2 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t2)));
	int16x4_t s3 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t3)));
	int16x4_t s4 = vget_high_s16(vreinterpretq_s16_u16(vmovl_u8(t0)));
	int16x4_t s5 = vget_high_s16(vreinterpretq_s16_u16(vmovl_u8(t1)));
	int16x4_t s6 = vget_high_s16(vreinterpretq_s16_u16(vmovl_u8(t2)));

	src += 7;

	do {
	load_u8_8x4(src, src_stride, &t0, &t1, &t2, &t3);
	transpose_elems_inplace_u8_8x4(&t0, &t1, &t2, &t3);

	int16x4_t s7 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t0)));
	int16x4_t s8 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t1)));
	int16x4_t s9 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t2)));
	int16x4_t s10 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t3)));

	int16x4_t d0 = convolve8_4(s0, s1, s2, s3, s4, s5, s6, s7, filter);
	int16x4_t d1 = convolve8_4(s1, s2, s3, s4, s5, s6, s7, s8, filter);
	int16x4_t d2 = convolve8_4(s2, s3, s4, s5, s6, s7, s8, s9, filter);
	int16x4_t d3 = convolve8_4(s3, s4, s5, s6, s7, s8, s9, s10, filter);
	uint8x8_t d01 = vqrshrun_n_s16(vcombine_s16(d0, d1), FILTER_BITS);
	uint8x8_t d23 = vqrshrun_n_s16(vcombine_s16(d2, d3), FILTER_BITS);

	transpose_elems_inplace_u8_4x4(&d01, &d23);

	store_u8x4_strided_x2(dst + 0 * dst_stride, 2 * dst_stride, d01);
	store_u8x4_strided_x2(dst + 1 * dst_stride, 2 * dst_stride, d23);

	s0 = s4;
	s1 = s5;
	s2 = s6;
	s3 = s7;
	s4 = s8;
	s5 = s9;
	s6 = s10;

	src += 4;
	dst += 4;
	w -= 4;
	} while (w != 0);
	} else {
	if (w == 4) {
	do {
	uint8x8_t t0, t1, t2, t3, t4, t5, t6, t7;
	load_u8_8x8(src, src_stride, &t0, &t1, &t2, &t3, &t4, &t5, &t6, &t7);
	transpose_elems_inplace_u8_8x8(&t0, &t1, &t2, &t3, &t4, &t5, &t6, &t7);

	int16x8_t s0 = vreinterpretq_s16_u16(vmovl_u8(t0));
	int16x8_t s1 = vreinterpretq_s16_u16(vmovl_u8(t1));
	int16x8_t s2 = vreinterpretq_s16_u16(vmovl_u8(t2));
	int16x8_t s3 = vreinterpretq_s16_u16(vmovl_u8(t3));
	int16x8_t s4 = vreinterpretq_s16_u16(vmovl_u8(t4));
	int16x8_t s5 = vreinterpretq_s16_u16(vmovl_u8(t5));
	int16x8_t s6 = vreinterpretq_s16_u16(vmovl_u8(t6));

	load_u8_8x8(src + 7, src_stride, &t0, &t1, &t2, &t3, &t4, &t5, &t6,
	&t7);
	transpose_elems_u8_4x8(t0, t1, t2, t3, t4, t5, t6, t7, &t0, &t1, &t2,
	&t3);

	int16x8_t s7 = vreinterpretq_s16_u16(vmovl_u8(t0));
	int16x8_t s8 = vreinterpretq_s16_u16(vmovl_u8(t1));
	int16x8_t s9 = vreinterpretq_s16_u16(vmovl_u8(t2));
	int16x8_t s10 = vreinterpretq_s16_u16(vmovl_u8(t3));

	uint8x8_t d0 = convolve8_8(s0, s1, s2, s3, s4, s5, s6, s7, filter);
	uint8x8_t d1 = convolve8_8(s1, s2, s3, s4, s5, s6, s7, s8, filter);
	uint8x8_t d2 = convolve8_8(s2, s3, s4, s5, s6, s7, s8, s9, filter);
	uint8x8_t d3 = convolve8_8(s3, s4, s5, s6, s7, s8, s9, s10, filter);

	transpose_elems_inplace_u8_8x4(&d0, &d1, &d2, &d3);

	store_u8x4_strided_x2(dst + 0 * dst_stride, 4 * dst_stride, d0);
	store_u8x4_strided_x2(dst + 1 * dst_stride, 4 * dst_stride, d1);
	store_u8x4_strided_x2(dst + 2 * dst_stride, 4 * dst_stride, d2);
	store_u8x4_strided_x2(dst + 3 * dst_stride, 4 * dst_stride, d3);

	src += 8 * src_stride;
	dst += 8 * dst_stride;
	h -= 8;
	} while (h > 0);
	} else {
	do {
	int width = w;
	const uint8_t *s = src;
	uint8_t *d = dst;

	uint8x8_t t0, t1, t2, t3, t4, t5, t6, t7;
	load_u8_8x8(s, src_stride, &t0, &t1, &t2, &t3, &t4, &t5, &t6, &t7);
	transpose_elems_inplace_u8_8x8(&t0, &t1, &t2, &t3, &t4, &t5, &t6, &t7);

	int16x8_t s0 = vreinterpretq_s16_u16(vmovl_u8(t0));
	int16x8_t s1 = vreinterpretq_s16_u16(vmovl_u8(t1));
	int16x8_t s2 = vreinterpretq_s16_u16(vmovl_u8(t2));
	int16x8_t s3 = vreinterpretq_s16_u16(vmovl_u8(t3));
	int16x8_t s4 = vreinterpretq_s16_u16(vmovl_u8(t4));
	int16x8_t s5 = vreinterpretq_s16_u16(vmovl_u8(t5));
	int16x8_t s6 = vreinterpretq_s16_u16(vmovl_u8(t6));

	s += 7;

	do {
	load_u8_8x8(s, src_stride, &t0, &t1, &t2, &t3, &t4, &t5, &t6, &t7);
	transpose_elems_inplace_u8_8x8(&t0, &t1, &t2, &t3, &t4, &t5, &t6,
	&t7);

	int16x8_t s7 = vreinterpretq_s16_u16(vmovl_u8(t0));
	int16x8_t s8 = vreinterpretq_s16_u16(vmovl_u8(t1));
	int16x8_t s9 = vreinterpretq_s16_u16(vmovl_u8(t2));
	int16x8_t s10 = vreinterpretq_s16_u16(vmovl_u8(t3));
	int16x8_t s11 = vreinterpretq_s16_u16(vmovl_u8(t4));
	int16x8_t s12 = vreinterpretq_s16_u16(vmovl_u8(t5));
	int16x8_t s13 = vreinterpretq_s16_u16(vmovl_u8(t6));
	int16x8_t s14 = vreinterpretq_s16_u16(vmovl_u8(t7));

	uint8x8_t d0 = convolve8_8(s0, s1, s2, s3, s4, s5, s6, s7, filter);
	uint8x8_t d1 = convolve8_8(s1, s2, s3, s4, s5, s6, s7, s8, filter);
	uint8x8_t d2 = convolve8_8(s2, s3, s4, s5, s6, s7, s8, s9, filter);
	uint8x8_t d3 = convolve8_8(s3, s4, s5, s6, s7, s8, s9, s10, filter);
	uint8x8_t d4 = convolve8_8(s4, s5, s6, s7, s8, s9, s10, s11, filter);
	uint8x8_t d5 = convolve8_8(s5, s6, s7, s8, s9, s10, s11, s12, filter);
	uint8x8_t d6 =
	convolve8_8(s6, s7, s8, s9, s10, s11, s12, s13, filter);
	uint8x8_t d7 =
	convolve8_8(s7, s8, s9, s10, s11, s12, s13, s14, filter);

	transpose_elems_inplace_u8_8x8(&d0, &d1, &d2, &d3, &d4, &d5, &d6,
	&d7);

	store_u8_8x8(d, dst_stride, d0, d1, d2, d3, d4, d5, d6, d7);

	s0 = s8;
	s1 = s9;
	s2 = s10;
	s3 = s11;
	s4 = s12;
	s5 = s13;
	s6 = s14;

	s += 8;
	d += 8;
	width -= 8;
	} while (width != 0);
	src += 8 * src_stride;
	dst += 8 * dst_stride;
	h -= 8;
	} while (h > 0);
	}
	}
	}

	static INLINE void convolve8_horiz_4tap_neon(const uint8_t *src,
	ptrdiff_t src_stride, uint8_t *dst,
	ptrdiff_t dst_stride,
	const int16_t *filter_x, int w,
	int h) {
	// All filter values are even, halve to reduce intermediate precision
	// requirements.
	const int16x4_t filter = vshr_n_s16(vld1_s16(filter_x + 2), 1);

	if (w == 4) {
	do {
	uint8x8_t t01[4];

	t01[0] = load_unaligned_u8(src + 0, (int)src_stride);
	t01[1] = load_unaligned_u8(src + 1, (int)src_stride);
	t01[2] = load_unaligned_u8(src + 2, (int)src_stride);
	t01[3] = load_unaligned_u8(src + 3, (int)src_stride);

	int16x8_t s01[4];
	s01[0] = vreinterpretq_s16_u16(vmovl_u8(t01[0]));
	s01[1] = vreinterpretq_s16_u16(vmovl_u8(t01[1]));
	s01[2] = vreinterpretq_s16_u16(vmovl_u8(t01[2]));
	s01[3] = vreinterpretq_s16_u16(vmovl_u8(t01[3]));

	uint8x8_t d01 = convolve4_8(s01[0], s01[1], s01[2], s01[3], filter);

	store_u8x4_strided_x2(dst + 0 * dst_stride, dst_stride, d01);

	src += 2 * src_stride;
	dst += 2 * dst_stride;
	h -= 2;
	} while (h > 0);
	} else {
	do {
	int width = w;
	const uint8_t *s = src;
	uint8_t *d = dst;

	do {
	uint8x8_t t0[4], t1[4];
	load_u8_8x4(s + 0 * src_stride, 1, &t0[0], &t0[1], &t0[2], &t0[3]);
	load_u8_8x4(s + 1 * src_stride, 1, &t1[0], &t1[1], &t1[2], &t1[3]);

	int16x8_t s0[4], s1[4];
	s0[0] = vreinterpretq_s16_u16(vmovl_u8(t0[0]));
	s0[1] = vreinterpretq_s16_u16(vmovl_u8(t0[1]));
	s0[2] = vreinterpretq_s16_u16(vmovl_u8(t0[2]));
	s0[3] = vreinterpretq_s16_u16(vmovl_u8(t0[3]));

	s1[0] = vreinterpretq_s16_u16(vmovl_u8(t1[0]));
	s1[1] = vreinterpretq_s16_u16(vmovl_u8(t1[1]));
	s1[2] = vreinterpretq_s16_u16(vmovl_u8(t1[2]));
	s1[3] = vreinterpretq_s16_u16(vmovl_u8(t1[3]));

	uint8x8_t d0 = convolve4_8(s0[0], s0[1], s0[2], s0[3], filter);
	uint8x8_t d1 = convolve4_8(s1[0], s1[1], s1[2], s1[3], filter);

	store_u8_8x2(d, dst_stride, d0, d1);

	s += 8;
	d += 8;
	width -= 8;
	} while (width != 0);
	src += 2 * src_stride;
	dst += 2 * dst_stride;
	h -= 2;
	} while (h > 0);
	}
	}

	void aom_convolve8_horiz_neon(const uint8_t *src, ptrdiff_t src_stride,
	uint8_t *dst, ptrdiff_t dst_stride,
	const int16_t *filter_x, int x_step_q4,
	const int16_t *filter_y, int y_step_q4, int w,
	int h) {
	assert((intptr_t)dst % 4 == 0);
	assert(dst_stride % 4 == 0);

	(void)x_step_q4;
	(void)filter_y;
	(void)y_step_q4;

	src -= ((SUBPEL_TAPS / 2) - 1);

	int filter_taps = get_filter_taps_convolve8(filter_x);

	if (filter_taps == 2) {
	convolve8_horiz_2tap_neon(src + 3, src_stride, dst, dst_stride, filter_x, w,
	h);
	} else if (filter_taps == 4) {
	convolve8_horiz_4tap_neon(src + 2, src_stride, dst, dst_stride, filter_x, w,
	h);
	} else {
	convolve8_horiz_8tap_neon(src, src_stride, dst, dst_stride, filter_x, w, h);
	}
	}

	static INLINE void convolve8_vert_8tap_neon(const uint8_t *src,
	ptrdiff_t src_stride, uint8_t *dst,
	ptrdiff_t dst_stride,
	const int16_t *filter_y, int w,
	int h) {
	const int16x8_t filter = vld1q_s16(filter_y);

	if (w == 4) {
	uint8x8_t t0, t1, t2, t3, t4, t5, t6;
	load_u8_8x7(src, src_stride, &t0, &t1, &t2, &t3, &t4, &t5, &t6);

	int16x4_t s0 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t0)));
	int16x4_t s1 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t1)));
	int16x4_t s2 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t2)));
	int16x4_t s3 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t3)));
	int16x4_t s4 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t4)));
	int16x4_t s5 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t5)));
	int16x4_t s6 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t6)));

	src += 7 * src_stride;

	do {
	load_u8_8x4(src, src_stride, &t0, &t1, &t2, &t3);

	int16x4_t s7 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t0)));
	int16x4_t s8 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t1)));
	int16x4_t s9 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t2)));
	int16x4_t s10 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t3)));

	int16x4_t d0 = convolve8_4(s0, s1, s2, s3, s4, s5, s6, s7, filter);
	int16x4_t d1 = convolve8_4(s1, s2, s3, s4, s5, s6, s7, s8, filter);
	int16x4_t d2 = convolve8_4(s2, s3, s4, s5, s6, s7, s8, s9, filter);
	int16x4_t d3 = convolve8_4(s3, s4, s5, s6, s7, s8, s9, s10, filter);
	uint8x8_t d01 = vqrshrun_n_s16(vcombine_s16(d0, d1), FILTER_BITS);
	uint8x8_t d23 = vqrshrun_n_s16(vcombine_s16(d2, d3), FILTER_BITS);

	store_u8x4_strided_x2(dst + 0 * dst_stride, dst_stride, d01);
	store_u8x4_strided_x2(dst + 2 * dst_stride, dst_stride, d23);

	s0 = s4;
	s1 = s5;
	s2 = s6;
	s3 = s7;
	s4 = s8;
	s5 = s9;
	s6 = s10;

	src += 4 * src_stride;
	dst += 4 * dst_stride;
	h -= 4;
	} while (h != 0);
	} else {
	do {
	uint8x8_t t0, t1, t2, t3, t4, t5, t6;
	load_u8_8x7(src, src_stride, &t0, &t1, &t2, &t3, &t4, &t5, &t6);

	int16x8_t s0 = vreinterpretq_s16_u16(vmovl_u8(t0));
	int16x8_t s1 = vreinterpretq_s16_u16(vmovl_u8(t1));
	int16x8_t s2 = vreinterpretq_s16_u16(vmovl_u8(t2));
	int16x8_t s3 = vreinterpretq_s16_u16(vmovl_u8(t3));
	int16x8_t s4 = vreinterpretq_s16_u16(vmovl_u8(t4));
	int16x8_t s5 = vreinterpretq_s16_u16(vmovl_u8(t5));
	int16x8_t s6 = vreinterpretq_s16_u16(vmovl_u8(t6));

	int height = h;
	const uint8_t s = src + 7 src_stride;
	uint8_t *d = dst;

	do {
	load_u8_8x4(s, src_stride, &t0, &t1, &t2, &t3);

	int16x8_t s7 = vreinterpretq_s16_u16(vmovl_u8(t0));
	int16x8_t s8 = vreinterpretq_s16_u16(vmovl_u8(t1));
	int16x8_t s9 = vreinterpretq_s16_u16(vmovl_u8(t2));
	int16x8_t s10 = vreinterpretq_s16_u16(vmovl_u8(t3));

	uint8x8_t d0 = convolve8_8(s0, s1, s2, s3, s4, s5, s6, s7, filter);
	uint8x8_t d1 = convolve8_8(s1, s2, s3, s4, s5, s6, s7, s8, filter);
	uint8x8_t d2 = convolve8_8(s2, s3, s4, s5, s6, s7, s8, s9, filter);
	uint8x8_t d3 = convolve8_8(s3, s4, s5, s6, s7, s8, s9, s10, filter);

	store_u8_8x4(d, dst_stride, d0, d1, d2, d3);

	s0 = s4;
	s1 = s5;
	s2 = s6;
	s3 = s7;
	s4 = s8;
	s5 = s9;
	s6 = s10;

	s += 4 * src_stride;
	d += 4 * dst_stride;
	height -= 4;
	} while (height != 0);
	src += 8;
	dst += 8;
	w -= 8;
	} while (w != 0);
	}
	}

	void aom_convolve8_vert_neon(const uint8_t *src, ptrdiff_t src_stride,
	uint8_t *dst, ptrdiff_t dst_stride,
	const int16_t *filter_x, int x_step_q4,
	const int16_t *filter_y, int y_step_q4, int w,
	int h) {
	assert((intptr_t)dst % 4 == 0);
	assert(dst_stride % 4 == 0);

	(void)filter_x;
	(void)x_step_q4;
	(void)y_step_q4;

	src -= ((SUBPEL_TAPS / 2) - 1) * src_stride;

	int filter_taps = get_filter_taps_convolve8(filter_y);

	if (filter_taps == 2) {
	convolve8_vert_2tap_neon(src + 3 * src_stride, src_stride, dst, dst_stride,
	filter_y, w, h);
	} else if (filter_taps == 4) {
	convolve8_vert_4tap_neon(src + 2 * src_stride, src_stride, dst, dst_stride,
	filter_y, w, h);
	} else {
	convolve8_vert_8tap_neon(src, src_stride, dst, dst_stride, filter_y, w, h);
	}
	}