libvpx: Pull from upstream

source/libvpx/vpx_dsp/arm/vpx_convolve_neon.c

 /*
  *  Copyright (c) 2013 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 <assert.h>
+
 #include "./vpx_dsp_rtcd.h"
 #include "vpx_dsp/vpx_dsp_common.h"
 #include "vpx_ports/mem.h"
 
 void vpx_convolve8_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) {
   /* Given our constraints: w <= 64, h <= 64, taps == 8 we can reduce the
    * maximum buffer size to 64 * 64 + 7 (+ 1 to make it divisible by 4).
    */
   DECLARE_ALIGNED(8, uint8_t, temp[64 * 72]);
 
   // Account for the vertical phase needing 3 lines prior and 4 lines post
   int intermediate_height = h + 7;
 
-  if (x_step_q4 != 16 || y_step_q4 != 16) {
-    vpx_convolve8_c(src, src_stride,
-                    dst, dst_stride,
-                    filter_x, x_step_q4,
-                    filter_y, y_step_q4,
-                    w, h);
-    return;
-  }
+  assert(y_step_q4 == 16);
+  assert(x_step_q4 == 16);
 
   /* Filter starting 3 lines back. The neon implementation will ignore the
    * given height and filter a multiple of 4 lines. Since this goes in to
    * the temp buffer which has lots of extra room and is subsequently discarded
    * this is safe if somewhat less than ideal.
    */
   vpx_convolve8_horiz_neon(src - src_stride * 3, src_stride,
                            temp, 64,
                            filter_x, x_step_q4, filter_y, y_step_q4,
                            w, intermediate_height);
 
   /* Step into the temp buffer 3 lines to get the actual frame data */
   vpx_convolve8_vert_neon(temp + 64 * 3, 64,
                           dst, dst_stride,
                           filter_x, x_step_q4, filter_y, y_step_q4,
                           w, h);
 }
 
 void vpx_convolve8_avg_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) {
   DECLARE_ALIGNED(8, uint8_t, temp[64 * 72]);
   int intermediate_height = h + 7;
 
-  if (x_step_q4 != 16 || y_step_q4 != 16) {
-    vpx_convolve8_avg_c(src, src_stride,
-                        dst, dst_stride,
-                        filter_x, x_step_q4,
-                        filter_y, y_step_q4,
-                        w, h);
-    return;
-  }
+  assert(y_step_q4 == 16);
+  assert(x_step_q4 == 16);
 
   /* This implementation has the same issues as above. In addition, we only want
    * to average the values after both passes.
    */
   vpx_convolve8_horiz_neon(src - src_stride * 3, src_stride,
                            temp, 64,
                            filter_x, x_step_q4, filter_y, y_step_q4,
                            w, intermediate_height);
   vpx_convolve8_avg_vert_neon(temp + 64 * 3,
                               64, dst, dst_stride,
                               filter_x, x_step_q4, filter_y, y_step_q4,
                               w, h);
 }