[stubs] Optimize LoadGlobalViaContextStub and StoreGlobalViaContextStub.

src/mips/lithium-codegen-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.7
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2881 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(v0));
 
-  __ li(LoadGlobalViaContextDescriptor::DepthRegister(),
-        Operand(Smi::FromInt(instr->depth())));
-  __ li(LoadGlobalViaContextDescriptor::SlotRegister(),
-        Operand(Smi::FromInt(instr->slot_index())));
-  __ li(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) {
+    __ li(LoadGlobalViaContextDescriptor::SlotRegister(), Operand(slot));
+    __ li(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);
+  }
 }
 
 
 void LCodeGen::DoLoadContextSlot(LLoadContextSlot* instr) {
   Register context = ToRegister(instr->context());
   Register result = ToRegister(instr->result());
 
   __ lw(result, ContextOperand(context, instr->slot_index()));
   if (instr->hydrogen()->RequiresHoleCheck()) {
     __ LoadRoot(at, Heap::kTheHoleValueRootIndex);
@@ skipping 1281 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()));
 
-  __ li(StoreGlobalViaContextDescriptor::DepthRegister(),
-        Operand(Smi::FromInt(instr->depth())));
-  __ li(StoreGlobalViaContextDescriptor::SlotRegister(),
-        Operand(Smi::FromInt(instr->slot_index())));
-  __ li(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) {
+    __ li(StoreGlobalViaContextDescriptor::SlotRegister(), Operand(slot));
+    __ li(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(language_mode())
+                       ? Runtime::kStoreGlobalViaContext_Strict
+                       : Runtime::kStoreGlobalViaContext_Sloppy,
+                   3);
+  }
 }
 
 
 void LCodeGen::DoBoundsCheck(LBoundsCheck* instr) {
   Condition cc = instr->hydrogen()->allow_equality() ? hi : hs;
   Operand operand(0);
   Register reg;
   if (instr->index()->IsConstantOperand()) {
     operand = ToOperand(instr->index());
     reg = ToRegister(instr->length());
@@ skipping 1846 matching lines @@
   __ Push(at, ToRegister(instr->function()));
   CallRuntime(Runtime::kPushBlockContext, 2, instr);
   RecordSafepoint(Safepoint::kNoLazyDeopt);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8