Make guard_cid and nullable_cid half words.

runtime/vm/intermediate_language_arm64.cc

 // Copyright (c) 2014, 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_ARM64.
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/dart_entry.h"
@@ skipping 1452 matching lines @@
 
   Label* deopt = compiler->is_optimizing() ?
       compiler->AddDeoptStub(deopt_id(), ICData::kDeoptGuardField) : NULL;
 
   Label* fail = (deopt != NULL) ? deopt : &fail_label;
 
   if (emit_full_guard) {
     __ LoadObject(field_reg, Field::ZoneHandle(field().raw()), PP);
 
     FieldAddress field_cid_operand(
-        field_reg, Field::guarded_cid_offset(), kWord);
+        field_reg, Field::guarded_cid_offset(), kUnsignedHalfword);
     FieldAddress field_nullability_operand(
-        field_reg, Field::is_nullable_offset(), kWord);
+        field_reg, Field::is_nullable_offset(), kUnsignedHalfword);
 
     if (value_cid == kDynamicCid) {
       LoadValueCid(compiler, value_cid_reg, value_reg);
       Label skip_length_check;
-      __ ldr(TMP, field_cid_operand, kWord);
+      __ ldr(TMP, field_cid_operand, kUnsignedHalfword);
       __ CompareRegisters(value_cid_reg, TMP);
       __ b(&ok, EQ);
-      __ ldr(TMP, field_nullability_operand, kWord);
+      __ ldr(TMP, field_nullability_operand, kUnsignedHalfword);
       __ CompareRegisters(value_cid_reg, TMP);
     } else if (value_cid == kNullCid) {
-      __ ldr(value_cid_reg, field_nullability_operand, kWord);
+      __ ldr(value_cid_reg, field_nullability_operand, kUnsignedHalfword);
       __ CompareImmediate(value_cid_reg, value_cid, PP);
     } else {
       Label skip_length_check;
-      __ ldr(value_cid_reg, field_cid_operand, kWord);
+      __ ldr(value_cid_reg, field_cid_operand, kUnsignedHalfword);
       __ CompareImmediate(value_cid_reg, value_cid, PP);
     }
     __ b(&ok, EQ);
 
     // Check if the tracked state of the guarded field can be initialized
     // inline. If the field needs length check we fall through to runtime
     // which is responsible for computing offset of the length field
     // based on the class id.
     // Length guard will be emitted separately when needed via GuardFieldLength
     // instruction after GuardFieldClass.
     if (!field().needs_length_check()) {
       // Uninitialized field can be handled inline. Check if the
       // field is still unitialized.
-      __ ldr(TMP, field_cid_operand, kWord);
+      __ ldr(TMP, field_cid_operand, kUnsignedHalfword);
       __ CompareImmediate(TMP, kIllegalCid, PP);
       __ b(fail, NE);
 
       if (value_cid == kDynamicCid) {
-        __ str(value_cid_reg, field_cid_operand, kWord);
-        __ str(value_cid_reg, field_nullability_operand, kWord);
+        __ str(value_cid_reg, field_cid_operand, kUnsignedHalfword);
+        __ str(value_cid_reg, field_nullability_operand, kUnsignedHalfword);
       } else {
         __ LoadImmediate(TMP, value_cid, PP);
-        __ str(TMP, field_cid_operand, kWord);
-        __ str(TMP, field_nullability_operand, kWord);
+        __ str(TMP, field_cid_operand, kUnsignedHalfword);
+        __ str(TMP, field_nullability_operand, kUnsignedHalfword);
       }
 
       if (deopt == NULL) {
         ASSERT(!compiler->is_optimizing());
         __ b(&ok);
       }
     }
 
     if (deopt == NULL) {
       ASSERT(!compiler->is_optimizing());
       __ Bind(fail);
 
       __ LoadFieldFromOffset(
-          TMP, field_reg, Field::guarded_cid_offset(), PP, kWord);
+          TMP, field_reg, Field::guarded_cid_offset(), PP, kUnsignedHalfword);
       __ CompareImmediate(TMP, kDynamicCid, PP);
       __ b(&ok, EQ);
 
       __ Push(field_reg);
       __ Push(value_reg);
       __ CallRuntime(kUpdateFieldCidRuntimeEntry, 2);
       __ Drop(2);  // Drop the field and the value.
     }
   } else {
     ASSERT(compiler->is_optimizing());
@@ skipping 298 matching lines @@
       locs()->live_registers()->Add(locs()->in(1), kTagged);
     }
 
     Label store_pointer;
     Label store_double;
     Label store_float32x4;
     Label store_float64x2;
 
     __ LoadObject(temp, Field::ZoneHandle(field().raw()), PP);
 
-    __ LoadFieldFromOffset(temp2, temp, Field::is_nullable_offset(), PP, kWord);
+    __ LoadFieldFromOffset(temp2, temp, Field::is_nullable_offset(), PP,
+                           kUnsignedHalfword);
     __ CompareImmediate(temp2, kNullCid, PP);
     __ b(&store_pointer, EQ);
 
     __ LoadFromOffset(
         temp2, temp, Field::kind_bits_offset() - kHeapObjectTag,
         PP, kUnsignedByte);
     __ tsti(temp2, Immediate(1 << Field::kUnboxingCandidateBit));
     __ b(&store_pointer, EQ);
 
-    __ LoadFieldFromOffset(temp2, temp, Field::guarded_cid_offset(), PP, kWord);
+    __ LoadFieldFromOffset(temp2, temp, Field::guarded_cid_offset(), PP,
+                           kUnsignedHalfword);
     __ CompareImmediate(temp2, kDoubleCid, PP);
     __ b(&store_double, EQ);
 
-    __ LoadFieldFromOffset(temp2, temp, Field::guarded_cid_offset(), PP, kWord);
+    __ LoadFieldFromOffset(temp2, temp, Field::guarded_cid_offset(), PP,
+                           kUnsignedHalfword);
     __ CompareImmediate(temp2, kFloat32x4Cid, PP);
     __ b(&store_float32x4, EQ);
 
-    __ LoadFieldFromOffset(temp2, temp, Field::guarded_cid_offset(), PP, kWord);
+    __ LoadFieldFromOffset(temp2, temp, Field::guarded_cid_offset(), PP,
+                           kUnsignedHalfword);
     __ CompareImmediate(temp2, kFloat64x2Cid, PP);
     __ b(&store_float64x2, EQ);
 
     // Fall through.
     __ b(&store_pointer);
 
     if (!compiler->is_optimizing()) {
         locs()->live_registers()->Add(locs()->in(0));
         locs()->live_registers()->Add(locs()->in(1));
     }
@@ skipping 314 matching lines @@
     const Register temp = locs()->temp(0).reg();
 
     Label load_pointer;
     Label load_double;
     Label load_float32x4;
     Label load_float64x2;
 
     __ LoadObject(result_reg, Field::ZoneHandle(field()->raw()), PP);
 
     FieldAddress field_cid_operand(
-        result_reg, Field::guarded_cid_offset(), kWord);
+        result_reg, Field::guarded_cid_offset(), kUnsignedHalfword);
     FieldAddress field_nullability_operand(
-        result_reg, Field::is_nullable_offset(), kWord);
+        result_reg, Field::is_nullable_offset(), kUnsignedHalfword);
 
-    __ ldr(temp, field_nullability_operand, kWord);
+    __ ldr(temp, field_nullability_operand, kUnsignedHalfword);
     __ CompareImmediate(temp, kNullCid, PP);
     __ b(&load_pointer, EQ);
 
-    __ ldr(temp, field_cid_operand, kWord);
+    __ ldr(temp, field_cid_operand, kUnsignedHalfword);
     __ CompareImmediate(temp, kDoubleCid, PP);
     __ b(&load_double, EQ);
 
-    __ ldr(temp, field_cid_operand, kWord);
+    __ ldr(temp, field_cid_operand, kUnsignedHalfword);
     __ CompareImmediate(temp, kFloat32x4Cid, PP);
     __ b(&load_float32x4, EQ);
 
-    __ ldr(temp, field_cid_operand, kWord);
+    __ ldr(temp, field_cid_operand, kUnsignedHalfword);
     __ CompareImmediate(temp, kFloat64x2Cid, PP);
     __ b(&load_float64x2, EQ);
 
     // Fall through.
     __ b(&load_pointer);
 
     if (!compiler->is_optimizing()) {
       locs()->live_registers()->Add(locs()->in(0));
     }
 
@@ skipping 3426 matching lines @@
                                 1,
                                 locs());
   __ Drop(1);
   __ Pop(result);
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64