Add Smi::Zero and replace all Smi::FromInt(0) calls

src/full-codegen/mips/full-codegen-mips.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.
 
 #if V8_TARGET_ARCH_MIPS
 
 // Note on Mips implementation:
 //
 // The result_register() for mips is the 'v0' register, which is defined
 // by the ABI to contain function return values. However, the first
@@ skipping 344 matching lines @@
   // Always emit a 'return undefined' in case control fell off the end of
   // the body.
   { Comment cmnt(masm_, "[ return <undefined>;");
     __ LoadRoot(v0, Heap::kUndefinedValueRootIndex);
   }
   EmitReturnSequence();
 }
 
 
 void FullCodeGenerator::ClearAccumulator() {
-  DCHECK(Smi::FromInt(0) == 0);
+  DCHECK(Smi::kZero == 0);
   __ mov(v0, zero_reg);
 }
 
 
 void FullCodeGenerator::EmitProfilingCounterDecrement(int delta) {
   __ li(a2, Operand(profiling_counter_));
   __ lw(a3, FieldMemOperand(a2, Cell::kValueOffset));
   __ Subu(a3, a3, Operand(Smi::FromInt(delta)));
   __ sw(a3, FieldMemOperand(a2, Cell::kValueOffset));
 }
@@ skipping 668 matching lines @@
   Label fixed_array;
   __ lw(a2, FieldMemOperand(v0, HeapObject::kMapOffset));
   __ LoadRoot(at, Heap::kMetaMapRootIndex);
   __ Branch(&fixed_array, ne, a2, Operand(at));
 
   // We got a map in register v0. Get the enumeration cache from it.
   Label no_descriptors;
   __ bind(&use_cache);
 
   __ EnumLength(a1, v0);
-  __ Branch(&no_descriptors, eq, a1, Operand(Smi::FromInt(0)));
+  __ Branch(&no_descriptors, eq, a1, Operand(Smi::kZero));
 
   __ LoadInstanceDescriptors(v0, a2);
   __ lw(a2, FieldMemOperand(a2, DescriptorArray::kEnumCacheOffset));
   __ lw(a2, FieldMemOperand(a2, DescriptorArray::kEnumCacheBridgeCacheOffset));
 
   // Set up the four remaining stack slots.
-  __ li(a0, Operand(Smi::FromInt(0)));
+  __ li(a0, Operand(Smi::kZero));
   // Push map, enumeration cache, enumeration cache length (as smi) and zero.
   __ Push(v0, a2, a1, a0);
   __ jmp(&loop);
 
   __ bind(&no_descriptors);
   __ Drop(1);
   __ jmp(&exit);
 
   // We got a fixed array in register v0. Iterate through that.
   __ bind(&fixed_array);
 
   __ li(a1, Operand(Smi::FromInt(1)));  // Smi(1) indicates slow check
   __ Push(a1, v0);  // Smi and array
   __ lw(a1, FieldMemOperand(v0, FixedArray::kLengthOffset));
   __ Push(a1);  // Fixed array length (as smi).
   PrepareForBailoutForId(stmt->PrepareId(), BailoutState::NO_REGISTERS);
-  __ li(a0, Operand(Smi::FromInt(0)));
+  __ li(a0, Operand(Smi::kZero));
   __ Push(a0);  // Initial index.
 
   // Generate code for doing the condition check.
   __ bind(&loop);
   SetExpressionAsStatementPosition(stmt->each());
 
   // Load the current count to a0, load the length to a1.
   __ lw(a0, MemOperand(sp, 0 * kPointerSize));
   __ lw(a1, MemOperand(sp, 1 * kPointerSize));
   __ Branch(loop_statement.break_label(), hs, a0, Operand(a1));
@@ skipping 834 matching lines @@
       __ SubBranchOvf(v0, left, Operand(right), &stub_call);
       break;
     case Token::MUL: {
       __ SmiUntag(scratch1, right);
       __ Mul(scratch2, v0, left, scratch1);
       __ sra(scratch1, v0, 31);
       __ Branch(&stub_call, ne, scratch1, Operand(scratch2));
       __ Branch(&done, ne, v0, Operand(zero_reg));
       __ Addu(scratch2, right, left);
       __ Branch(&stub_call, lt, scratch2, Operand(zero_reg));
-      DCHECK(Smi::FromInt(0) == 0);
+      DCHECK(Smi::kZero == 0);
       __ mov(v0, zero_reg);
       break;
     }
     case Token::BIT_OR:
       __ Or(v0, left, Operand(right));
       break;
     case Token::BIT_AND:
       __ And(v0, left, Operand(right));
       break;
     case Token::BIT_XOR:
@@ skipping 1131 matching lines @@
   LhsKind assign_type = Property::GetAssignType(prop);
 
   // Evaluate expression and get value.
   if (assign_type == VARIABLE) {
     DCHECK(expr->expression()->AsVariableProxy()->var() != NULL);
     AccumulatorValueContext context(this);
     EmitVariableLoad(expr->expression()->AsVariableProxy());
   } else {
     // Reserve space for result of postfix operation.
     if (expr->is_postfix() && !context()->IsEffect()) {
-      __ li(at, Operand(Smi::FromInt(0)));
+      __ li(at, Operand(Smi::kZero));
       PushOperand(at);
     }
     switch (assign_type) {
       case NAMED_PROPERTY: {
         // Put the object both on the stack and in the register.
         VisitForStackValue(prop->obj());
         __ lw(LoadDescriptor::ReceiverRegister(), MemOperand(sp, 0));
         EmitNamedPropertyLoad(prop);
         break;
       }
@@ skipping 576 matching lines @@
          reinterpret_cast<uint32_t>(
              isolate->builtins()->OnStackReplacement()->entry()));
   return ON_STACK_REPLACEMENT;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS