ARM/ARM64: Optimise HLoadNamedField and HStoreNamedField.

src/arm/lithium-codegen-arm.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/arm/lithium-codegen-arm.h"
 #include "src/arm/lithium-gap-resolver-arm.h"
 #include "src/code-stubs.h"
 #include "src/stub-cache.h"
@@ skipping 3036 matching lines @@
     return;
   }
 
   if (instr->hydrogen()->representation().IsDouble()) {
     DwVfpRegister result = ToDoubleRegister(instr->result());
     __ vldr(result, FieldMemOperand(object, offset));
     return;
   }
 
   Register result = ToRegister(instr->result());
+  Register source = object;
   if (!access.IsInobject()) {
-    __ ldr(result, FieldMemOperand(object, JSObject::kPropertiesOffset));
-    object = result;
+    if (instr->object_properties()) {
+      source = ToRegister(instr->object_properties());
+    } else {
+      __ ldr(result, FieldMemOperand(object, JSObject::kPropertiesOffset));
+      source = result;
+    }
   }
-  MemOperand operand = FieldMemOperand(object, offset);
+  MemOperand operand = FieldMemOperand(source, offset);
   __ Load(result, operand, access.representation());
 }
 
 
 void LCodeGen::DoLoadNamedGeneric(LLoadNamedGeneric* instr) {
   ASSERT(ToRegister(instr->context()).is(cp));
   ASSERT(ToRegister(instr->object()).is(r0));
   ASSERT(ToRegister(instr->result()).is(r0));
 
   // Name is always in r2.
@@ skipping 1031 matching lines @@
                           offset,
                           value,
                           scratch,
                           GetLinkRegisterState(),
                           kSaveFPRegs,
                           EMIT_REMEMBERED_SET,
                           instr->hydrogen()->SmiCheckForWriteBarrier(),
                           instr->hydrogen()->PointersToHereCheckForValue());
     }
   } else {
-    __ ldr(scratch, FieldMemOperand(object, JSObject::kPropertiesOffset));
+    Register destination;
+    if (instr->object_properties()) {
+      destination = ToRegister(instr->object_properties());
+    } else {
+      __ ldr(scratch, FieldMemOperand(object, JSObject::kPropertiesOffset));
+      destination = scratch;
+    }
     MemOperand operand = FieldMemOperand(scratch, offset);
     __ Store(value, operand, representation);
     if (instr->hydrogen()->NeedsWriteBarrier()) {
       // Update the write barrier for the properties array.
       // object is used as a scratch register.
       __ RecordWriteField(scratch,
                           offset,
                           value,
                           object,
                           GetLinkRegisterState(),
@@ skipping 1705 matching lines @@
   __ Push(scope_info);
   __ push(ToRegister(instr->function()));
   CallRuntime(Runtime::kHiddenPushBlockContext, 2, instr);
   RecordSafepoint(Safepoint::kNoLazyDeopt);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal