[Interpreter] Transform StrictEquality with null/undefined to special bytecodes.

src/interpreter/bytecode-peephole-optimizer.cc

 // Copyright 2016 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-peephole-optimizer.h"
 
 #include "src/objects-inl.h"
 #include "src/objects.h"
 
 namespace v8 {
@@ skipping 120 matching lines @@
                                                 BytecodeNode* const last,
                                                 BytecodeNode* const current) {
   DCHECK_EQ(last->bytecode(), Bytecode::kLdaZero);
   current->set_bytecode(new_bytecode, 0, current->operand(0),
                         current->operand(1));
   if (last->source_info().is_valid()) {
     current->set_source_info(last->source_info());
   }
 }
 
-void TransformEqualityWithNullOrUndefinedToTestUndetectable(
-    BytecodeNode* const last, BytecodeNode* const current) {
+void TransformEqualityWithNullOrUndefined(Bytecode new_bytecode,
+                                          BytecodeNode* const last,
+                                          BytecodeNode* const current) {
   DCHECK((last->bytecode() == Bytecode::kLdaNull) ||
          (last->bytecode() == Bytecode::kLdaUndefined));
-  DCHECK_EQ(current->bytecode(), Bytecode::kTestEqual);
-  current->set_bytecode(Bytecode::kTestUndetectable, current->operand(0));
+  DCHECK((current->bytecode() == Bytecode::kTestEqual) ||
+         (current->bytecode() == Bytecode::kTestEqualStrict));
+  current->set_bytecode(new_bytecode, current->operand(0));
   if (last->source_info().is_valid()) {
     current->set_source_info(last->source_info());
   }
 }
 
 }  // namespace
 
 void BytecodePeepholeOptimizer::DefaultAction(
     BytecodeNode* const node, const PeepholeActionAndData* action_data) {
   DCHECK(LastIsValid());
@@ skipping 98 matching lines @@
   if (!node->source_info().is_valid() || !last()->source_info().is_valid()) {
     // Fused last and current into current.
     TransformLdaZeroBinaryOpToBinaryOpWithZero(action_data->bytecode, last(),
                                                node);
     SetLast(node);
   } else {
     DefaultAction(node);
   }
 }
 
-void BytecodePeepholeOptimizer::
-    TransformEqualityWithNullOrUndefinedToTestUndetectableAction(
-        BytecodeNode* const node, const PeepholeActionAndData* action_data) {
+void BytecodePeepholeOptimizer::TransformEqualityWithNullOrUndefinedAction(
+    BytecodeNode* const node, const PeepholeActionAndData* action_data) {
   DCHECK(LastIsValid());
   DCHECK(!Bytecodes::IsJump(node->bytecode()));
   // Fused last and current into current.
-  TransformEqualityWithNullOrUndefinedToTestUndetectable(last(), node);
+  TransformEqualityWithNullOrUndefined(action_data->bytecode, last(), node);
   SetLast(node);
 }
 
 void BytecodePeepholeOptimizer::DefaultJumpAction(
     BytecodeNode* const node, const PeepholeActionAndData* action_data) {
   DCHECK(LastIsValid());
   DCHECK(Bytecodes::IsJump(node->bytecode()));
 
   next_stage()->Write(last());
   InvalidateLast();
@@ skipping 45 matching lines @@
 #undef CASE
     default:
       UNREACHABLE();
       break;
   }
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8