[turbofan] Add FixedArray peephole optimizations to CodeStubAssembler

test/cctest/compiler/test-code-stub-assembler.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/interface-descriptors.h"
 #include "src/isolate.h"
 #include "test/cctest/compiler/function-tester.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 228 matching lines @@
   DCHECK_EQ(temp, var1.value());
   m.Return(temp);
 }
 
 TEST(FixedArrayAccessSmiIndex) {
   Isolate* isolate(CcTest::InitIsolateOnce());
   VoidDescriptor descriptor(isolate);
   CodeStubAssemblerTester m(isolate, descriptor);
   Handle<FixedArray> array = isolate->factory()->NewFixedArray(5);
   array->set(4, Smi::FromInt(733));
-  m.Return(m.LoadFixedArrayElementSmiIndex(m.HeapConstant(array),
-                                           m.SmiTag(m.Int32Constant(4))));
+  m.Return(m.LoadFixedArrayElement(m.HeapConstant(array),
+                                   m.SmiTag(m.Int32Constant(4)), 0,
+                                   CodeStubAssembler::SMI_PARAMETERS));
   Handle<Code> code = m.GenerateCode();
   FunctionTester ft(descriptor, code);
   MaybeHandle<Object> result = ft.Call();
   CHECK_EQ(733, Handle<Smi>::cast(result.ToHandleChecked())->value());
 }
 
 TEST(LoadHeapNumberValue) {
   Isolate* isolate(CcTest::InitIsolateOnce());
   VoidDescriptor descriptor(isolate);
   CodeStubAssemblerTester m(isolate, descriptor);
@@ skipping 93 matching lines @@
   m.Bind(&l3);
   m.Switch(m.Int32Constant(2), &default_label, values, labels, 2);
   m.Bind(&l1);
   m.Goto(&l2);
   m.Bind(&l2);
   m.Goto(&default_label);
   m.Bind(&default_label);
   USE(m.GenerateCode());
 }
 
+TEST(TestToConstant) {
+  Isolate* isolate(CcTest::InitIsolateOnce());
+  VoidDescriptor descriptor(isolate);
+  CodeStubAssemblerTester m(isolate, descriptor);
+  int32_t value32;
+  int64_t value64;
+  Node* a = m.Int32Constant(5);
+  CHECK(m.ToInt32Constant(a, value32));
+  CHECK(m.ToInt64Constant(a, value64));
+
+  a = m.Int64Constant(static_cast<int64_t>(1) << 32);
+  CHECK(!m.ToInt32Constant(a, value32));
+  CHECK(m.ToInt64Constant(a, value64));
+
+  a = m.Int64Constant(13);
+  CHECK(m.ToInt32Constant(a, value32));
+  CHECK(m.ToInt64Constant(a, value64));
+
+  a = m.UndefinedConstant();
+  CHECK(!m.ToInt32Constant(a, value32));
+  CHECK(!m.ToInt64Constant(a, value64));
+
+  a = m.UndefinedConstant();
+  CHECK(!m.ToInt32Constant(a, value32));
+  CHECK(!m.ToInt64Constant(a, value64));
+}
+
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8