[turbofan] Recognize fast path for Number.parseInt.

test/unittests/compiler/js-builtin-reducer-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-builtin-reducer.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/node-properties.h"
 #include "src/compiler/simplified-operator.h"
 #include "src/compiler/typer.h"
 #include "src/isolate-inl.h"
@@ skipping 31 matching lines @@
         JSObject::GetProperty(isolate()->global_object(),
                               isolate()->factory()->NewStringFromAsciiChecked(
                                   "Math")).ToHandleChecked();
     Handle<JSFunction> f = Handle<JSFunction>::cast(
         Object::GetProperty(
             m, isolate()->factory()->NewStringFromAsciiChecked(name))
             .ToHandleChecked());
     return HeapConstant(f);
   }
 
+  Node* NumberFunction(const char* name) {
+    Handle<Object> m =
+        JSObject::GetProperty(
+            isolate()->global_object(),
+            isolate()->factory()->NewStringFromAsciiChecked("Number"))
+            .ToHandleChecked();
+    Handle<JSFunction> f = Handle<JSFunction>::cast(
+        Object::GetProperty(
+            m, isolate()->factory()->NewStringFromAsciiChecked(name))
+            .ToHandleChecked());
+    return HeapConstant(f);
+  }
+
   Node* StringFunction(const char* name) {
     Handle<Object> m =
         JSObject::GetProperty(
             isolate()->global_object(),
             isolate()->factory()->NewStringFromAsciiChecked("String"))
             .ToHandleChecked();
     Handle<JSFunction> f = Handle<JSFunction>::cast(
         Object::GetProperty(
             m, isolate()->factory()->NewStringFromAsciiChecked(name))
             .ToHandleChecked());
@@ skipping 1274 matching lines @@
   Node* call = graph()->NewNode(javascript()->CallFunction(3), function,
                                 UndefinedConstant(), p0, context, frame_state,
                                 effect, control);
   Reduction r = Reduce(call);
 
   ASSERT_TRUE(r.Changed());
   EXPECT_THAT(r.replacement(), IsNumberTrunc(IsPlainPrimitiveToNumber(p0)));
 }
 
 // -----------------------------------------------------------------------------
+// Number.parseInt
+
+TEST_F(JSBuiltinReducerTest, NumberParseIntWithIntegral32) {
+  Node* function = NumberFunction("parseInt");
+
+  Node* effect = graph()->start();
+  Node* control = graph()->start();
+  Node* context = UndefinedConstant();
+  Node* frame_state = graph()->start();
+  TRACED_FOREACH(Type*, t0, kIntegral32Types) {
+    Node* p0 = Parameter(t0, 0);
+    Node* call = graph()->NewNode(javascript()->CallFunction(3), function,
+                                  UndefinedConstant(), p0, context, frame_state,
+                                  effect, control);
+    Reduction r = Reduce(call);
+
+    ASSERT_TRUE(r.Changed());
+    EXPECT_THAT(r.replacement(), IsNumberToInt32(p0));
+  }
+}
+
+TEST_F(JSBuiltinReducerTest, NumberParseIntWithIntegral32AndUndefined) {
+  Node* function = NumberFunction("parseInt");
+
+  Node* effect = graph()->start();
+  Node* control = graph()->start();
+  Node* context = UndefinedConstant();
+  Node* frame_state = graph()->start();
+  TRACED_FOREACH(Type*, t0, kIntegral32Types) {
+    Node* p0 = Parameter(t0, 0);
+    Node* p1 = Parameter(Type::Undefined(), 1);
+    Node* call = graph()->NewNode(javascript()->CallFunction(4), function,
+                                  UndefinedConstant(), p0, p1, context,
+                                  frame_state, effect, control);
+    Reduction r = Reduce(call);
+
+    ASSERT_TRUE(r.Changed());
+    EXPECT_THAT(r.replacement(), IsNumberToInt32(p0));
+  }
+}
+
+// -----------------------------------------------------------------------------
 // String.fromCharCode
 
 TEST_F(JSBuiltinReducerTest, StringFromCharCodeWithNumber) {
   Node* function = StringFunction("fromCharCode");
 
   Node* effect = graph()->start();
   Node* control = graph()->start();
   Node* context = UndefinedConstant();
   Node* frame_state = graph()->start();
   TRACED_FOREACH(Type*, t0, kNumberTypes) {
@@ skipping 22 matching lines @@
   Reduction r = Reduce(call);
 
   ASSERT_TRUE(r.Changed());
   EXPECT_THAT(r.replacement(),
               IsStringFromCharCode(IsPlainPrimitiveToNumber(p0)));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8