ARM: Make use of d16-d31 when available.

src/platform-linux.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 138 matching lines @@
       break;
     case VFP3:
       search_string = "vfpv3";
       break;
     case ARMv7:
       search_string = "ARMv7";
       break;
     case SUDIV:
       search_string = "idiva";
       break;
+    case VFP32DREGS:
+      // This case is handled specially below.
+      break;
     default:
       UNREACHABLE();
   }
 
+  if (feature == VFP32DREGS) {
+    return ArmCpuHasFeature(VFP3) && !CPUInfoContainsString("d16");
+  }
+
   if (CPUInfoContainsString(search_string)) {
     return true;
   }
 
   if (feature == VFP3) {
     // Some old kernels will report vfp not vfpv3. Here we make a last attempt
     // to detect vfpv3 by checking for vfp *and* neon, since neon is only
     // available on architectures with vfpv3.
     // Checking neon on its own is not enough as it is possible to have neon
     // without vfp.
@@ skipping 1140 matching lines @@
 
 
 void Sampler::Stop() {
   ASSERT(IsActive());
   SignalSender::RemoveActiveSampler(this);
   SetActive(false);
 }
 
 
 } }  // namespace v8::internal