[Interpreter] Optimize code of the form 'if (x === undefined)'.

src/interpreter/bytecode-array-builder.h

 // 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.
 
 #ifndef V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_
 #define V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_
 
 #include "src/ast/ast.h"
 #include "src/base/compiler-specific.h"
 #include "src/globals.h"
@@ skipping 296 matching lines @@
   BytecodeArrayBuilder& GetSuperConstructor(Register out);
 
   // Deletes property from an object. This expects that accumulator contains
   // the key to be deleted and the register contains a reference to the object.
   BytecodeArrayBuilder& Delete(Register object, LanguageMode language_mode);
 
   // Tests.
   BytecodeArrayBuilder& CompareOperation(Token::Value op, Register reg,
                                          int feedback_slot);
   BytecodeArrayBuilder& CompareOperation(Token::Value op, Register reg);
+  BytecodeArrayBuilder& CompareUndetectable();
+  BytecodeArrayBuilder& CompareUndefined();
+  BytecodeArrayBuilder& CompareNull();
+  BytecodeArrayBuilder& CompareNil(Token::Value op, NilValue nil);
   BytecodeArrayBuilder& CompareTypeOf(
       TestTypeOfFlags::LiteralFlag literal_flag);
 
   // Converts accumulator and stores result in register |out|.
   BytecodeArrayBuilder& ConvertAccumulatorToObject(Register out);
   BytecodeArrayBuilder& ConvertAccumulatorToName(Register out);
   BytecodeArrayBuilder& ConvertAccumulatorToNumber(Register out);
 
   // Flow Control.
   BytecodeArrayBuilder& Bind(BytecodeLabel* label);
   BytecodeArrayBuilder& Bind(const BytecodeLabel& target, BytecodeLabel* label);
 
   BytecodeArrayBuilder& Jump(BytecodeLabel* label);
   BytecodeArrayBuilder& JumpIfTrue(BytecodeLabel* label);
   BytecodeArrayBuilder& JumpIfFalse(BytecodeLabel* label);
   BytecodeArrayBuilder& JumpIfNotHole(BytecodeLabel* label);
   BytecodeArrayBuilder& JumpIfJSReceiver(BytecodeLabel* label);
   BytecodeArrayBuilder& JumpIfNull(BytecodeLabel* label);
+  BytecodeArrayBuilder& JumpIfNotNull(BytecodeLabel* label);
   BytecodeArrayBuilder& JumpIfUndefined(BytecodeLabel* label);
+  BytecodeArrayBuilder& JumpIfNotUndefined(BytecodeLabel* label);
+  BytecodeArrayBuilder& JumpIfNil(BytecodeLabel* label, Token::Value op,
+                                  NilValue nil);
+  BytecodeArrayBuilder& JumpIfNotNil(BytecodeLabel* label, Token::Value op,
+                                     NilValue nil);
   BytecodeArrayBuilder& JumpLoop(BytecodeLabel* label, int loop_depth);
 
   BytecodeArrayBuilder& StackCheck(int position);
 
   // Sets the pending message to the value in the accumulator, and returns the
   // previous pending message in the accumulator.
   BytecodeArrayBuilder& SetPendingMessage();
 
   BytecodeArrayBuilder& Throw();
   BytecodeArrayBuilder& ReThrow();
@@ skipping 147 matching lines @@
   static int const kNoFeedbackSlot = 0;
 
   DISALLOW_COPY_AND_ASSIGN(BytecodeArrayBuilder);
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_