Enable AVX2 optimizations for libvpx

libvpx.gyp

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 {
   'variables': {
     'libvpx_build_vp9%': 1,
     'libvpx_source%': 'source/libvpx',
     'conditions': [
       ['os_posix==1', {
         'asm_obj_extension': 'o',
@@ skipping 112 matching lines @@
               'dependencies': [
                 'libvpx_intrinsics_mmx',
                 'libvpx_intrinsics_sse2',
                 # Currently no sse3 intrinsic functions
                 #'libvpx_intrinsics_sse3',
                 'libvpx_intrinsics_ssse3',
                 # Currently no sse4_1 intrinsic functions
                 #'libvpx_intrinsics_sse4_1',
                 # Currently no avx intrinsic functions
                 #'libvpx_intrinsics_avx',
-                # Add avx2 support when VS2013 lands: crbug.com/328981
-                #'libvpx_intrinsics_avx2',
+                'libvpx_intrinsics_avx2',
               ],
             }],
             ['target_arch=="arm64"', {
               'includes': [ 'libvpx_srcs_generic.gypi', ],
             }],
             ['target_arch=="x64"', {
               'conditions': [
                 ['msan==1', {
                   'includes': [ 'libvpx_srcs_generic.gypi', ],
                 }, {
                   'includes': [
                     'libvpx_srcs_x86_64.gypi',
                     'libvpx_srcs_nacl.gypi',
                   ],
                   'dependencies': [
                     'libvpx_intrinsics_mmx',
                     'libvpx_intrinsics_sse2',
                     # Currently no sse3 intrinsic functions
                     #'libvpx_intrinsics_sse3',
                     'libvpx_intrinsics_ssse3',
                     # Currently no sse4_1 intrinsic functions
                     #'libvpx_intrinsics_sse4_1',
                     # Currently no avx intrinsic functions
                     #'libvpx_intrinsics_avx',
-                    # Add avx2 support when VS2013 lands: crbug.com/328981
-                    #'libvpx_intrinsics_avx2',
+                    'libvpx_intrinsics_avx2',
                   ],
                 }],
               ],
             }],
             ['clang == 1', {
               'xcode_settings': {
                 'WARNING_CFLAGS': [
                   # libvpx heavily relies on implicit enum casting.
                   '-Wno-conversion',
                   # libvpx does `if ((a == b))` in some places.
@@ skipping 411 matching lines @@
          # Need this otherwise gyp won't run the rule on them.
           'sources': [
             '<(INTERMEDIATE_DIR)/vpx_scale_asm_offsets.o',
           ],
         }],
       ],
       'includes': ['obj_int_extract.gypi'],
     },
   ],
 }