[stubs] Further optimize Load/StoreGlobalViaContext stubs.

src/ia32/code-stubs-ia32.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"
 
 #if V8_TARGET_ARCH_IA32
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 5101 matching lines @@
   GenerateCase(masm, FAST_HOLEY_ELEMENTS);
 
   __ bind(&fast_elements_case);
   GenerateCase(masm, FAST_ELEMENTS);
 }
 
 
 void LoadGlobalViaContextStub::Generate(MacroAssembler* masm) {
   Register context_reg = esi;
   Register slot_reg = ebx;
-  Register name_reg = ecx;
   Register result_reg = eax;
   Label slow_case;
 
   // Go up context chain to the script context.
   for (int i = 0; i < depth(); ++i) {
     __ mov(result_reg, ContextOperand(context_reg, Context::PREVIOUS_INDEX));
     context_reg = result_reg;
   }
 
   // Load the PropertyCell value at the specified slot.
   __ mov(result_reg, ContextOperand(context_reg, slot_reg));
   __ mov(result_reg, FieldOperand(result_reg, PropertyCell::kValueOffset));
 
   // Check that value is not the_hole.
   __ CompareRoot(result_reg, Heap::kTheHoleValueRootIndex);
   __ j(equal, &slow_case, Label::kNear);
   __ Ret();
 
   // Fallback to the runtime.
   __ bind(&slow_case);
   __ SmiTag(slot_reg);
   __ Pop(result_reg);  // Pop return address.
   __ Push(slot_reg);
-  __ Push(name_reg);
   __ Push(result_reg);  // Push return address.
-  __ TailCallRuntime(Runtime::kLoadGlobalViaContext, 2, 1);
+  __ TailCallRuntime(Runtime::kLoadGlobalViaContext, 1, 1);
 }
 
 
 void StoreGlobalViaContextStub::Generate(MacroAssembler* masm) {
   Register context_reg = esi;
   Register slot_reg = ebx;
-  Register name_reg = ecx;
   Register value_reg = eax;
   Register cell_reg = edi;
   Register cell_details_reg = edx;
+  Register cell_value_reg = ecx;
   Label fast_heapobject_case, fast_smi_case, slow_case;
 
   if (FLAG_debug_code) {
     __ CompareRoot(value_reg, Heap::kTheHoleValueRootIndex);
     __ Check(not_equal, kUnexpectedValue);
-    __ AssertName(name_reg);
   }
 
   // Go up context chain to the script context.
   for (int i = 0; i < depth(); ++i) {
     __ mov(cell_reg, ContextOperand(context_reg, Context::PREVIOUS_INDEX));
     context_reg = cell_reg;
   }
 
   // Load the PropertyCell at the specified slot.
   __ mov(cell_reg, ContextOperand(context_reg, slot_reg));
@@ skipping 58 matching lines @@
   // Check if PropertyCell contains data with constant type.
   __ cmp(cell_details_reg,
          Immediate(PropertyDetails::PropertyCellTypeField::encode(
                        PropertyCellType::kConstantType) |
                    PropertyDetails::KindField::encode(kData)));
   __ j(not_equal, &slow_case, Label::kNear);
 
   // Now either both old and new values must be SMIs or both must be heap
   // objects with same map.
   Label value_is_heap_object;
-  Register cell_value_reg = cell_details_reg;
   __ mov(cell_value_reg, FieldOperand(cell_reg, PropertyCell::kValueOffset));
   __ JumpIfNotSmi(value_reg, &value_is_heap_object, Label::kNear);
   __ JumpIfNotSmi(cell_value_reg, &slow_case, Label::kNear);
   // Old and new values are SMIs, no need for a write barrier here.
   __ bind(&fast_smi_case);
   __ mov(FieldOperand(cell_reg, PropertyCell::kValueOffset), value_reg);
   __ Ret();
   __ bind(&value_is_heap_object);
   __ JumpIfSmi(cell_value_reg, &slow_case, Label::kNear);
   Register cell_value_map_reg = cell_value_reg;
   __ mov(cell_value_map_reg,
          FieldOperand(cell_value_reg, HeapObject::kMapOffset));
   __ cmp(cell_value_map_reg, FieldOperand(value_reg, HeapObject::kMapOffset));
   __ j(equal, &fast_heapobject_case);
 
   // Fallback to the runtime.
   __ bind(&slow_case);
   __ SmiTag(slot_reg);
   __ Pop(cell_reg);  // Pop return address.
   __ Push(slot_reg);
-  __ Push(name_reg);
   __ Push(value_reg);
   __ Push(cell_reg);  // Push return address.
   __ TailCallRuntime(is_strict(language_mode())
                          ? Runtime::kStoreGlobalViaContext_Strict
                          : Runtime::kStoreGlobalViaContext_Sloppy,
-                     3, 1);
+                     2, 1);
 }
 
 
 // Generates an Operand for saving parameters after PrepareCallApiFunction.
 static Operand ApiParameterOperand(int index) {
   return Operand(esp, index * kPointerSize);
 }
 
 
 // Prepares stack to put arguments (aligns and so on). Reserves
@@ skipping 373 matching lines @@
                            Operand(ebp, 7 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_IA32