Dedupe code for array/object initialization on ARM.

runtime/vm/assembler_arm.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/assembler.h"
 #include "vm/cpu.h"
 #include "vm/longjump.h"
@@ skipping 1717 matching lines @@
   int32_t ignored = 0;
   if (Address::CanHoldStoreOffset(kWord, offset - kHeapObjectTag, &ignored)) {
     StoreIntoObjectNoBarrier(object, FieldAddress(object, offset), value);
   } else {
     AddImmediate(IP, object, offset - kHeapObjectTag);
     StoreIntoObjectNoBarrier(object, Address(IP), value);
   }
 }
 
 
+void Assembler::InitializeFieldsNoBarrier(Register object,
+                                          Register begin,
+                                          Register end,
+                                          Register value_even,
+                                          Register value_odd) {
+  ASSERT(value_odd == value_even + 1);
+  Label init_loop;
+  Bind(&init_loop);
+  AddImmediate(begin, 2 * kWordSize);
+  cmp(begin, Operand(end));
+  strd(value_even, Address(begin, -2 * kWordSize), LS);
+  b(&init_loop, CC);
+  str(value_even, Address(begin, -2 * kWordSize), HI);
+#if defined(DEBUG)
+  Label done;
+  StoreIntoObjectFilter(object, value_even, &done);
+  StoreIntoObjectFilter(object, value_odd, &done);
+  Stop("Store buffer update is required");
+  Bind(&done);
+#endif  // defined(DEBUG)
+  // No store buffer update.
+}
+
+
 void Assembler::LoadClassId(Register result, Register object, Condition cond) {
   ASSERT(RawObject::kClassIdTagPos == 16);
   ASSERT(RawObject::kClassIdTagSize == 16);
   const intptr_t class_id_offset = Object::tags_offset() +
       RawObject::kClassIdTagPos / kBitsPerByte;
   ldrh(result, FieldAddress(object, class_id_offset), cond);
 }
 
 
 void Assembler::LoadClassById(Register result, Register class_id) {
@@ skipping 1674 matching lines @@
 
 
 const char* Assembler::FpuRegisterName(FpuRegister reg) {
   ASSERT((0 <= reg) && (reg < kNumberOfFpuRegisters));
   return fpu_reg_names[reg];
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM