ARGBExtractAlpha 16 pixels at a time for ARM

libyuv.gyp

 # Copyright 2011 The LibYuv 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.
 
 {
   'includes': [
@@ skipping 43 matching lines @@
          ],
         }],
         ['build_neon != 0', {
           'defines': [
             'LIBYUV_NEON',
           ],
           'cflags!': [
             '-mfpu=vfp',
             '-mfpu=vfpv3',
             '-mfpu=vfpv3-d16',
+            # '-mthumb',  # arm32 not thumb
           ],
           'conditions': [
             # Disable LTO in libyuv_neon target due to gcc 4.9 compiler bug.
             ['clang == 0 and use_lto == 1', {
               'cflags!': [
                 '-flto',
                 '-ffat-lto-objects',
               ],
             }],
             # arm64 does not need -mfpu=neon option as neon is not optional
             ['target_arch != "arm64"', {
               'cflags': [
                 '-mfpu=neon',
+                # '-marm',  # arm32 not thumb
               ],
             }],
           ],
         }],
         ['OS != "ios" and libyuv_disable_jpeg != 1', {
           'defines': [
             'HAVE_JPEG'
           ],
           'conditions': [
             # Caveat system jpeg support may not support motion jpeg
@@ skipping 52 matching lines @@
       ],
     },
   ], # targets.
 }
 
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