Add MIPS SIMD Arch (MSA) optimized MirrorRow function

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': [
     'libyuv.gypi',
   ],
   # Make sure that if we are being compiled to an xcodeproj, nothing tries to
   # include a .pch.
   'xcode_settings': {
     'GCC_PREFIX_HEADER': '',
     'GCC_PRECOMPILE_PREFIX_HEADER': 'NO',
   },
   'variables': {
     'use_system_libjpeg%': 0,
     'libyuv_disable_jpeg%': 0,
     # 'chromium_code' treats libyuv as internal and increases warning level.
     'chromium_code': 1,
     # clang compiler default variable usable by other apps that include libyuv.
     'clang%': 0,
     # Link-Time Optimizations.
     'use_lto%': 0,
     'build_neon': 0,
+    'build_msa': 0,
     'conditions': [
        ['(target_arch == "armv7" or target_arch == "armv7s" or \
        (target_arch == "arm" and arm_version >= 7) or target_arch == "arm64")\
        and (arm_neon == 1 or arm_neon_optional == 1)', {
          'build_neon': 1,
        }],
+       ['(target_arch == "mipsel" or target_arch == "mips64el")\
+       and (mips_msa == 1)',
+       {
+         'build_msa': 1,
+       }],
     ],
   },
 
   'targets': [
     {
       'target_name': 'libyuv',
       # Change type to 'shared_library' to build .so or .dll files.
       'type': 'static_library',
       'variables': {
         'optimize': 'max',  # enable O2 and ltcg.
@@ skipping 27 matching lines @@
             }],
             # arm64 does not need -mfpu=neon option as neon is not optional
             ['target_arch != "arm64"', {
               'cflags': [
                 '-mfpu=neon',
                 # '-marm',  # arm32 not thumb
               ],
             }],
           ],
         }],
+        ['build_msa != 0', {
+          'defines': [
+            'LIBYUV_MSA',
+          ],
+        }],
         ['OS != "ios" and libyuv_disable_jpeg != 1', {
           'defines': [
             'HAVE_JPEG'
           ],
           'conditions': [
             # Caveat system jpeg support may not support motion jpeg
             [ 'use_system_libjpeg == 1', {
               'dependencies': [
                  '<(DEPTH)/third_party/libjpeg/libjpeg.gyp:libjpeg',
               ],
@@ skipping 48 matching lines @@
       ],
     },
   ], # targets.
 }
 
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