MIPS: Faster memcpy.

src/platform.h

Index: src/platform.h
diff --git a/src/platform.h b/src/platform.h
index 6bc94e14d7ed8fd5568606427f36577fdd5040d1..f94a5266fa44c73415bdbcb6d078ea1a834aa293 100644
--- a/src/platform.h
+++ b/src/platform.h
@@ -365,6 +365,26 @@ class OS {
                                  size_t size) {
     (*memcopy_uint16_uint8_function)(dest, src, size);
   }
+#elif defined(V8_HOST_ARCH_MIPS)
+  typedef void (*MemCopyUint8Function)(uint8_t* dest,
+                                       const uint8_t* src,
+                                       size_t size);
+  static MemCopyUint8Function memcopy_uint8_function;
+  static void MemCopyUint8Wrapper(uint8_t* dest,
+                                  const uint8_t* src,
+                                  size_t chars) {
+    memcpy(dest, src, chars);
+  }
+  // For values < 16, the assembler function is slower than the inlined C code.
+  static const int kMinComplexMemCopy = 16;
+  static void MemCopy(void* dest, const void* src, size_t size) {
+    (*memcopy_uint8_function)(reinterpret_cast<uint8_t*>(dest),
+                              reinterpret_cast<const uint8_t*>(src),
+                              size);
+  }
+  static void MemMove(void* dest, const void* src, size_t size) {
+    memmove(dest, src, size);
+  }
 #else
   // Copy memory area to disjoint memory area.
   static void MemCopy(void* dest, const void* src, size_t size) {