win: 'EnableEnhancedInstructionSet': '5' now enables /arch:AVX2.

pylib/gyp/msvs_emulation.py

 # Copyright (c) 2012 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """
 This module helps emulate Visual Studio 2008 behavior on top of other
 build systems, primarily ninja.
 """
 
 import os
@@ skipping 438 matching lines @@
     cl('BasicRuntimeChecks', map={'1': 's', '2': 'u', '3': '1'}, prefix='/RTC')
     cl('RuntimeLibrary',
         map={'0': 'T', '1': 'Td', '2': 'D', '3': 'Dd'}, prefix='/M')
     cl('ExceptionHandling', map={'1': 'sc','2': 'a'}, prefix='/EH')
     cl('DefaultCharIsUnsigned', map={'true': '/J'})
     cl('TreatWChar_tAsBuiltInType',
         map={'false': '-', 'true': ''}, prefix='/Zc:wchar_t')
     cl('EnablePREfast', map={'true': '/analyze'})
     cl('AdditionalOptions', prefix='')
     cl('EnableEnhancedInstructionSet',
-       map={'1': 'SSE', '2': 'SSE2', '3': 'AVX', '4': 'IA32'}, prefix='/arch:')
+        map={'1': 'SSE', '2': 'SSE2', '3': 'AVX', '4': 'IA32', '5': 'AVX2'},
+        prefix='/arch:')
     cflags.extend(['/FI' + f for f in self._Setting(
         ('VCCLCompilerTool', 'ForcedIncludeFiles'), config, default=[])])
     if self.vs_version.short_name in ('2013', '2013e', '2015'):
       # New flag required in 2013 to maintain previous PDB behavior.
       cflags.append('/FS')
     # ninja handles parallelism by itself, don't have the compiler do it too.
     cflags = filter(lambda x: not x.startswith('/MP'), cflags)
     return cflags
 
   def _GetPchFlags(self, config, extension):
@@ skipping 583 matching lines @@
 
   # To determine processor word size on Windows, in addition to checking
   # PROCESSOR_ARCHITECTURE (which reflects the word size of the current
   # process), it is also necessary to check PROCESSOR_ARCHITEW6432 (which
   # contains the actual word size of the system when running thru WOW64).
   if ('64' in os.environ.get('PROCESSOR_ARCHITECTURE', '') or
       '64' in os.environ.get('PROCESSOR_ARCHITEW6432', '')):
     default_variables['MSVS_OS_BITS'] = 64
   else:
     default_variables['MSVS_OS_BITS'] = 32