ARM: Implement memcpy using NEON.

src/platform-linux.cc

Index: src/platform-linux.cc
diff --git a/src/platform-linux.cc b/src/platform-linux.cc
index 2c6a36c37e15b0239e93ac3c1e577602d7504078..007b1e7737077a82575169c9b3e96d4c3af5fc5e 100644
--- a/src/platform-linux.cc
+++ b/src/platform-linux.cc
@@ -146,6 +146,9 @@ bool OS::ArmCpuHasFeature(CpuFeature feature) {
     case VFP3:
       search_string = "vfpv3";
       break;
+    case NEON:
+      search_string = "neon";
+      break;
     case ARMv7:
       search_string = "ARMv7";
       break;
@@ -200,6 +203,36 @@ CpuImplementer OS::GetCpuImplementer() {
 }
 
 
+CpuPart OS::GetCpuPart(CpuImplementer implementer) {
+  static bool use_cached_value = false;
+  static CpuPart cached_value = CPU_UNKNOWN;
+  if (use_cached_value) {
+    return cached_value;
+  }
+  if (implementer == ARM_IMPLEMENTER) {
+    if (CPUInfoContainsString("CPU part\t: 0xc0f")) {
+      cached_value = CORTEX_A15;
+    } else if (CPUInfoContainsString("CPU part\t: 0xc0c")) {
+      cached_value = CORTEX_A12;
+    } else if (CPUInfoContainsString("CPU part\t: 0xc09")) {
+      cached_value = CORTEX_A9;
+    } else if (CPUInfoContainsString("CPU part\t: 0xc08")) {
+      cached_value = CORTEX_A8;
+    } else if (CPUInfoContainsString("CPU part\t: 0xc07")) {
+      cached_value = CORTEX_A7;
+    } else if (CPUInfoContainsString("CPU part\t: 0xc05")) {
+      cached_value = CORTEX_A5;
+    } else {
+      cached_value = CPU_UNKNOWN;
+    }
+  } else {
+    cached_value = CPU_UNKNOWN;
+  }
+  use_cached_value = true;
+  return cached_value;
+}
+
+
 bool OS::ArmUsingHardFloat() {
   // GCC versions 4.6 and above define __ARM_PCS or __ARM_PCS_VFP to specify
   // the Floating Point ABI used (PCS stands for Procedure Call Standard).