[turbofan] Optimize ToName conversion.

test/unittests/compiler/js-typed-lowering-unittest.cc

 // Copyright 2014 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/compiler/js-typed-lowering.h"
 #include "src/code-factory.h"
 #include "src/compilation-dependencies.h"
 #include "src/compiler/access-builder.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/js-operator.h"
@@ skipping 108 matching lines @@
 TEST_F(JSTypedLoweringTest, JSToBooleanWithAny) {
   Node* input = Parameter(Type::Any(), 0);
   Node* context = Parameter(Type::Any(), 1);
   Reduction r = Reduce(graph()->NewNode(
       javascript()->ToBoolean(ToBooleanHint::kAny), input, context));
   ASSERT_FALSE(r.Changed());
 }
 
 
 // -----------------------------------------------------------------------------
+// JSToName
+
+TEST_F(JSTypedLoweringTest, JSToNameWithString) {
+  Node* const input = Parameter(Type::String(), 0);
+  Node* const context = Parameter(Type::Any(), 1);
+  Node* const effect = graph()->start();
+  Node* const control = graph()->start();
+  Reduction r = Reduce(graph()->NewNode(javascript()->ToName(), input, context,
+                                        EmptyFrameState(), effect, control));
+  ASSERT_TRUE(r.Changed());
+  EXPECT_EQ(input, r.replacement());
+}
+
+TEST_F(JSTypedLoweringTest, JSToNameWithSymbol) {
+  Node* const input = Parameter(Type::Symbol(), 0);
+  Node* const context = Parameter(Type::Any(), 1);
+  Node* const effect = graph()->start();
+  Node* const control = graph()->start();
+  Reduction r = Reduce(graph()->NewNode(javascript()->ToName(), input, context,
+                                        EmptyFrameState(), effect, control));
+  ASSERT_TRUE(r.Changed());
+  EXPECT_EQ(input, r.replacement());
+}
+
+TEST_F(JSTypedLoweringTest, JSToNameWithAny) {
+  Node* const input = Parameter(Type::Any(), 0);
+  Node* const context = Parameter(Type::Any(), 1);
+  Node* const effect = graph()->start();
+  Node* const control = graph()->start();
+  Reduction r = Reduce(graph()->NewNode(javascript()->ToName(), input, context,
+                                        EmptyFrameState(), effect, control));
+  ASSERT_FALSE(r.Changed());
+}
+
+// -----------------------------------------------------------------------------
 // JSToNumber
 
-
 TEST_F(JSTypedLoweringTest, JSToNumberWithPlainPrimitive) {
   Node* const input = Parameter(Type::PlainPrimitive(), 0);
   Node* const context = Parameter(Type::Any(), 1);
   Node* const effect = graph()->start();
   Node* const control = graph()->start();
   Reduction r =
       Reduce(graph()->NewNode(javascript()->ToNumber(), input, context,
                               EmptyFrameState(), effect, control));
   ASSERT_TRUE(r.Changed());
   EXPECT_THAT(r.replacement(), IsPlainPrimitiveToNumber(input));
@@ skipping 865 matching lines @@
                                         EmptyFrameState(), effect, control));
   ASSERT_TRUE(r.Changed());
   EXPECT_THAT(r.replacement(), IsSpeculativeNumberBitwiseXor(
                                    NumberOperationHint::kNumberOrOddball, lhs,
                                    rhs, effect, control));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8