Add the native intrinsic TypedData_setRange to optimize the setRange call when the destination and …

runtime/vm/object.cc

Index: runtime/vm/object.cc
===================================================================
--- runtime/vm/object.cc	(revision 20057)
+++ runtime/vm/object.cc	(working copy)
@@ -12381,6 +12381,28 @@
 };
 
 
+void TypedData::Copy(const TypedData& dst,
+                     intptr_t dst_offset_in_bytes,
+                     const TypedData& src,
+                     intptr_t src_offset_in_bytes,
+                     intptr_t length_in_bytes) {
+  ASSERT(Utils::RangeCheck(src_offset_in_bytes,
+                           length_in_bytes,
+                           src.LengthInBytes()));
+  ASSERT(Utils::RangeCheck(dst_offset_in_bytes,
+                           length_in_bytes,
+                           dst.LengthInBytes()));
+  {
+    NoGCScope no_gc;
+    if (length_in_bytes > 0) {
+      memmove(dst.DataAddr(dst_offset_in_bytes),
+              src.DataAddr(src_offset_in_bytes),
+              length_in_bytes);
+    }
+  }
+}
+
+
 RawTypedData* TypedData::New(intptr_t class_id,
                              intptr_t len,
                              Heap::Space space) {
@@ -12418,6 +12440,28 @@
 }
 
 
+void ExternalTypedData::Copy(const ExternalTypedData& dst,
+                             intptr_t dst_offset_in_bytes,
+                             const ExternalTypedData& src,
+                             intptr_t src_offset_in_bytes,
+                             intptr_t length_in_bytes) {
+  ASSERT(Utils::RangeCheck(src_offset_in_bytes,
+                           length_in_bytes,
+                           src.LengthInBytes()));
+  ASSERT(Utils::RangeCheck(dst_offset_in_bytes,
+                           length_in_bytes,
+                           dst.LengthInBytes()));
+  {
+    NoGCScope no_gc;
+    if (length_in_bytes > 0) {
+      memmove(dst.DataAddr(dst_offset_in_bytes),
+              src.DataAddr(src_offset_in_bytes),
+              length_in_bytes);
+    }
+  }
+}
+
+
 RawExternalTypedData* ExternalTypedData::New(intptr_t class_id,
                                              uint8_t* data,
                                              intptr_t len,