arm64 neon optimization building is enabled

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1042 16f28f9a-4ce2-e073-06de-1de4eb20be90

include/libyuv/row.h

@@ -465,7 +465,7 @@ typedef uint8 uvec8[16];
     #opcode " " #offset "(%" #base ",%" #index "," #scale "),%" #arg "\n"
 #endif  // defined(__native_client__) && defined(__x86_64__)
 
-#if defined(__arm__)
+#if defined(__arm__) || defined(__aarch64__)
 #undef MEMACCESS
 #if defined(__native_client__)
 #define MEMACCESS(base) ".p2align   3\nbic %" #base ", #0xc0000000\n"

libyuv.gyp

@@ -15,7 +15,10 @@
     'libyuv_disable_jpeg%': 0,
     'build_neon': 0,
     'conditions': [
-       [ '(target_arch == "armv7" or target_arch == "armv7s" or (target_arch == "arm" and arm_version >= 7)) and target_subarch != 64 and (arm_neon == 1 or arm_neon_optional == 1)', {
+       [ '(target_arch == "armv7" or target_arch == "armv7s" or \
+       (target_arch == "arm" and arm_version >= 7) or target_arch == "arm64")\
+       and target_subarch != 64 and (arm_neon == 1 or arm_neon_optional == 1)',
+       {
          'build_neon': 1,
        }],
     ],
@@ -35,9 +38,13 @@
             '-mfpu=vfpv3',
             '-mfpu=vfpv3-d16',
           ],
+          'conditions': [
+          ['target_arch != "arm64"', {
            'cflags': [
             '-mfpu=neon',
             ],
+           }],
+          ],
           'include_dirs': [
             'include',
             '.',
@@ -101,10 +108,16 @@
           'dependencies': [
             'libyuv_neon',
           ],
+          'conditions': [
+          #TODO LIBYUV_NEON is temporary disabled. When all arm64 port has
+          # been done, enable it.
+          ['target_arch !="arm64"', {
           'defines': [
             'LIBYUV_NEON',
           ]
           }],
+          ],
+        }],
         # MemorySanitizer does not support assembly code yet.
         # http://crbug.com/344505
         [ 'msan == 1', {

source/cpu_id.cc

@@ -256,12 +256,17 @@ int InitCpuFlags(void) {
   if (getenv("LIBYUV_DISABLE_MIPS_DSPR2")) {
     cpu_info_ &= ~kCpuHasMIPS_DSPR2;
   }
-#elif defined(__arm__)
+#elif defined(__arm__) || defined(__aarch64__)
 // gcc -mfpu=neon defines __ARM_NEON__
 // __ARM_NEON__ generates code that requires Neon.  NaCL also requires Neon.
 // For Linux, /proc/cpuinfo can be tested but without that assume Neon.
 #if defined(__ARM_NEON__) || defined(__native_client__) || !defined(__linux__)
   cpu_info_ = kCpuHasNEON;
+// For aarch64(arm64), /proc/cpuinfo's feature is not complete, e.g. no neon
+// flag in it.
+// So for aarch64, neon enabling is hard coded here.
+#elif defined(__aarch64__)
+  cpu_info_ = kCpuHasNEON;
 #else
   // Linux arm parse text file for neon detect.
   cpu_info_ = ArmCpuCaps("/proc/cpuinfo");