Add ARM64 SIMD support to libjpeg_turbo

libjpeg.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.
 
 {
   # This file is not used when use_system_libjpeg==1. Settings for building with
   # the system libjpeg is in third_party/libjpeg/libjpeg.gyp.
   'variables': {
     'shared_generated_dir': '<(SHARED_INTERMEDIATE_DIR)/third_party/libjpeg_turbo',
     'conditions': [
@@ skipping 164 matching lines @@
               ],
             }, {
               'sources': [
                 'jsimd_none.c',
               ],
             }]
           ],
         }],
         [ 'target_arch=="arm64"', {
           'sources': [
-            'jsimd_none.c',
+            'simd/jsimd_arm64.c',
+            'simd/jsimd_arm_neon_64.S',
           ],
         }],
         [ 'target_arch=="mipsel"', {
           'sources': [
             'jsimd_none.c',
           ],
         }],
 
         # Build rules for an asm file.
         # On Windows, we use the precompiled yasm binary. On Linux, we build
@@ skipping 42 matching lines @@
                 'yasm_format': '-fmacho64',
                 'yasm_flags': [
                   '-D__x86_64__',
                   '-DMACHO',
                   '-Imac/'
                 ],
               }],
             ],
           },
         }],
         [ 'OS=="linux" or OS=="freebsd" or (OS=="android" and target_arch!="arm")', {

[Noel Gordon, 2014/08/04 06:09:32]

Do we need a target_arch!="arm64" around here?

[rmcilroy, 2014/08/04 16:03:29]

Having looked at this, I'm pretty sure yasm is only used for ia32 and x64 so
rather than adding "arm64" and "mips", I think the condition should instead be
(OS=="android" and (target_arch=='ia32' or target_arch=='x64').  This also
involved a change in the "assemble" rule below.

           'conditions': [
             [ 'use_system_yasm==0', {
               'dependencies': [
                 '../yasm/yasm.gyp:yasm#host',
               ],
             }],
           ],
           'variables': {
             'conditions': [
               [ 'use_system_yasm==1', {
@@ skipping 48 matching lines @@
       ],
     },
   ],
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: