[Interpreter] Removes ToBoolean bytecode.

src/interpreter/bytecode-array-builder.cc

 // Copyright 2015 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/interpreter/bytecode-array-builder.h"
 
 namespace v8 {
 namespace internal {
 namespace interpreter {
 
@@ skipping 575 matching lines @@
   return *this;
 }
 
 
 bool BytecodeArrayBuilder::NeedToBooleanCast() {
   if (!LastBytecodeInSameBlock()) {
     return true;
   }
   PreviousBytecodeHelper previous_bytecode(*this);
   switch (previous_bytecode.GetBytecode()) {
-    case Bytecode::kToBoolean:
-      UNREACHABLE();
     // If the previous bytecode puts a boolean in the accumulator return true.
     case Bytecode::kLdaTrue:
     case Bytecode::kLdaFalse:
     case Bytecode::kLogicalNot:
     case Bytecode::kTestEqual:
     case Bytecode::kTestNotEqual:
     case Bytecode::kTestEqualStrict:
     case Bytecode::kTestNotEqualStrict:
     case Bytecode::kTestLessThan:
     case Bytecode::kTestLessThanOrEqual:
     case Bytecode::kTestGreaterThan:
     case Bytecode::kTestGreaterThanOrEqual:
     case Bytecode::kTestInstanceOf:
     case Bytecode::kTestIn:
     case Bytecode::kForInDone:
       return false;
     default:
       return true;
   }
 }
 
 
-BytecodeArrayBuilder& BytecodeArrayBuilder::CastAccumulatorToBoolean() {
-  if (!LastBytecodeInSameBlock()) {
-    Output(Bytecode::kToBoolean);
-    return *this;
-  }
-  // If the previous bytecode puts a boolean in the accumulator
-  // there is no need to emit an instruction.
-  if (NeedToBooleanCast()) {
-    PreviousBytecodeHelper previous_bytecode(*this);
-    switch (previous_bytecode.GetBytecode()) {
-      // If the previous bytecode is a constant evaluate it and return false.
-      case Bytecode::kLdaZero: {
-        LoadFalse();
-        break;
-      }
-      case Bytecode::kLdaSmi8: {
-        LoadBooleanConstant(previous_bytecode.GetOperand(0) != 0);
-        break;
-      }
-      case Bytecode::kLdaConstant: {
-        Handle<Object> object = previous_bytecode.GetConstantForIndexOperand(0);
-        LoadBooleanConstant(object->BooleanValue());
-        break;
-      }
-      default:
-        Output(Bytecode::kToBoolean);
-    }
-  }
-  return *this;
-}
-
-
 BytecodeArrayBuilder& BytecodeArrayBuilder::CastAccumulatorToJSObject() {
   Output(Bytecode::kToObject);
   return *this;
 }
 
 
 BytecodeArrayBuilder& BytecodeArrayBuilder::CastAccumulatorToName() {
   if (LastBytecodeInSameBlock()) {
     PreviousBytecodeHelper previous_bytecode(*this);
     switch (previous_bytecode.GetBytecode()) {
@@ skipping 778 matching lines @@
   DCHECK_GT(next_consecutive_count_, 0);
   builder_->BorrowConsecutiveTemporaryRegister(next_consecutive_register_);
   allocated_.push_back(next_consecutive_register_);
   next_consecutive_count_--;
   return Register(next_consecutive_register_++);
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8