DBC: Support large offsets in optimized field access.

runtime/vm/intermediate_language_dbc.cc

 // Copyright (c) 2016, 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"  // Needed here to get TARGET_ARCH_DBC.
 #if defined(TARGET_ARCH_DBC)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/cpu.h"
@@ skipping 1010 matching lines @@
   }
 }
 
 
 EMIT_NATIVE_CODE(StoreInstanceField, 2) {
   ASSERT(!HasTemp());
   ASSERT(offset_in_bytes() % kWordSize == 0);
   if (compiler->is_optimizing()) {
     const Register value = locs()->in(1).reg();
     const Register instance = locs()->in(0).reg();
-    __ StoreField(instance, offset_in_bytes() / kWordSize, value);
+    if (Utils::IsInt(8, offset_in_bytes() / kWordSize)) {
+      __ StoreField(instance, offset_in_bytes() / kWordSize, value);
+    } else {
+      __ StoreFieldExt(instance, value);
+      __ Nop(offset_in_bytes() / kWordSize);
+    }
   } else {
     __ StoreFieldTOS(offset_in_bytes() / kWordSize);
   }
 }
 
 
 EMIT_NATIVE_CODE(LoadField, 1, Location::RequiresRegister()) {
   ASSERT(offset_in_bytes() % kWordSize == 0);
   if (compiler->is_optimizing()) {
     const Register result = locs()->out(0).reg();
     const Register instance = locs()->in(0).reg();
-    __ LoadField(result, instance, offset_in_bytes() / kWordSize);
+    if (Utils::IsInt(8, offset_in_bytes() / kWordSize)) {
+      __ LoadField(result, instance, offset_in_bytes() / kWordSize);
+    } else {
+      __ LoadFieldExt(result, instance);
+      __ Nop(offset_in_bytes() / kWordSize);
+    }
   } else {
     __ LoadFieldTOS(offset_in_bytes() / kWordSize);
   }
 }
 
 
 EMIT_NATIVE_CODE(LoadUntagged, 1, Location::RequiresRegister()) {
   const Register obj = locs()->in(0).reg();
   const Register result = locs()->out(0).reg();
   if (object()->definition()->representation() == kUntagged) {
@@ skipping 829 matching lines @@
   __ IfULe(length, index);
   compiler->EmitDeopt(deopt_id(),
                       ICData::kDeoptCheckArrayBound,
                       (generalized_ ? ICData::kGeneralized : 0) |
                       (licm_hoisted_ ? ICData::kHoisted : 0));
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_DBC