[stubs] Optimize LoadGlobalViaContextStub and StoreGlobalViaContextStub.

src/arm64/lithium-codegen-arm64.cc

 // Copyright 2013 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/arm64/lithium-codegen-arm64.h"
 #include "src/arm64/lithium-gap-resolver-arm64.h"
 #include "src/base/bits.h"
 #include "src/code-factory.h"
@@ skipping 3366 matching lines @@
       CodeFactory::LoadICInOptimizedCode(isolate(), instr->typeof_mode(),
                                          SLOPPY, PREMONOMORPHIC).code();
   CallCode(ic, RelocInfo::CODE_TARGET, instr);
 }
 
 
 void LCodeGen::DoLoadGlobalViaContext(LLoadGlobalViaContext* instr) {
   DCHECK(ToRegister(instr->context()).is(cp));
   DCHECK(ToRegister(instr->result()).is(x0));
 
-  __ Mov(LoadGlobalViaContextDescriptor::DepthRegister(),
-         Operand(Smi::FromInt(instr->depth())));
-  __ Mov(LoadGlobalViaContextDescriptor::SlotRegister(),
-         Operand(Smi::FromInt(instr->slot_index())));
-  __ Mov(LoadGlobalViaContextDescriptor::NameRegister(),
-         Operand(instr->name()));
-
-  Handle<Code> stub =
-      CodeFactory::LoadGlobalViaContext(isolate(), instr->depth()).code();
-  CallCode(stub, RelocInfo::CODE_TARGET, instr);
+  int const slot = instr->slot_index();
+  int const depth = instr->depth();
+  if (depth <= LoadGlobalViaContextStub::kMaximumDepth) {
+    __ Mov(LoadGlobalViaContextDescriptor::SlotRegister(), Operand(slot));
+    __ Mov(LoadGlobalViaContextDescriptor::NameRegister(),
+           Operand(instr->name()));
+    Handle<Code> stub =
+        CodeFactory::LoadGlobalViaContext(isolate(), depth).code();
+    CallCode(stub, RelocInfo::CODE_TARGET, instr);
+  } else {
+    __ Push(Smi::FromInt(slot));
+    __ Push(instr->name());
+    __ CallRuntime(Runtime::kLoadGlobalViaContext, 2);
+  }
 }
 
 
 MemOperand LCodeGen::PrepareKeyedExternalArrayOperand(
     Register key,
     Register base,
     Register scratch,
     bool key_is_smi,
     bool key_is_constant,
     int constant_key,
@@ skipping 2126 matching lines @@
                         instr->hydrogen()->initialization_state()).code();
   CallCode(ic, RelocInfo::CODE_TARGET, instr);
 }
 
 
 void LCodeGen::DoStoreGlobalViaContext(LStoreGlobalViaContext* instr) {
   DCHECK(ToRegister(instr->context()).is(cp));
   DCHECK(ToRegister(instr->value())
              .is(StoreGlobalViaContextDescriptor::ValueRegister()));
 
-  __ Mov(StoreGlobalViaContextDescriptor::DepthRegister(),
-         Operand(Smi::FromInt(instr->depth())));
-  __ Mov(StoreGlobalViaContextDescriptor::SlotRegister(),
-         Operand(Smi::FromInt(instr->slot_index())));
-  __ Mov(StoreGlobalViaContextDescriptor::NameRegister(),
-         Operand(instr->name()));
-
-  Handle<Code> stub =
-      CodeFactory::StoreGlobalViaContext(isolate(), instr->depth(),
-                                         instr->language_mode()).code();
-  CallCode(stub, RelocInfo::CODE_TARGET, instr);
+  int const slot = instr->slot_index();
+  int const depth = instr->depth();
+  if (depth <= StoreGlobalViaContextStub::kMaximumDepth) {
+    __ Mov(StoreGlobalViaContextDescriptor::SlotRegister(), Operand(slot));
+    __ Mov(StoreGlobalViaContextDescriptor::NameRegister(),
+           Operand(instr->name()));
+    Handle<Code> stub = CodeFactory::StoreGlobalViaContext(
+                            isolate(), depth, instr->language_mode())
+                            .code();
+    CallCode(stub, RelocInfo::CODE_TARGET, instr);
+  } else {
+    __ Push(Smi::FromInt(slot));
+    __ Push(instr->name());
+    __ Push(StoreGlobalViaContextDescriptor::ValueRegister());
+    __ CallRuntime(is_strict(instr->language_mode())
+                       ? Runtime::kStoreGlobalViaContext_Strict
+                       : Runtime::kStoreGlobalViaContext_Sloppy,
+                   3);
+  }
 }
 
 
 void LCodeGen::DoStringAdd(LStringAdd* instr) {
   DCHECK(ToRegister(instr->context()).is(cp));
   DCHECK(ToRegister(instr->left()).Is(x1));
   DCHECK(ToRegister(instr->right()).Is(x0));
   StringAddStub stub(isolate(),
                      instr->hydrogen()->flags(),
                      instr->hydrogen()->pretenure_flag());
@@ skipping 608 matching lines @@
   Handle<ScopeInfo> scope_info = instr->scope_info();
   __ Push(scope_info);
   __ Push(ToRegister(instr->function()));
   CallRuntime(Runtime::kPushBlockContext, 2, instr);
   RecordSafepoint(Safepoint::kNoLazyDeopt);
 }
 
 
 }  // namespace internal
 }  // namespace v8