[turbofan] Add proper conversion operators for int32<->int64.

test/compiler-unittests/arm64/instruction-selector-arm64-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 <list>
 
 #include "test/compiler-unittests/instruction-selector-unittest.h"
 
-#include "test/cctest/compiler/instruction-selector-tester.h"
-
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 namespace {
 
 typedef Node* (RawMachineAssembler::*Constructor)(Node*, Node*);
 
 struct DPI {
   Constructor constructor;
@@ skipping 100 matching lines @@
 TEST_F(InstructionSelectorTest, MulDivWithParameter) {
   TRACED_FOREACH(DPI, dpi, kMulDivInstructions) {
     StreamBuilder m(this, kMachInt32, kMachInt32, kMachInt32);
     m.Return((m.*dpi.constructor)(m.Parameter(0), m.Parameter(1)));
     Stream s = m.Build();
     ASSERT_EQ(1U, s.size());
     EXPECT_EQ(dpi.arch_opcode, s[0]->arch_opcode());
   }
 }
 
+
+// -----------------------------------------------------------------------------
+// Conversions.
+
+
+TEST_F(InstructionSelectorTest, ChangeInt32ToInt64WithParameter) {
+  StreamBuilder m(this, kMachInt64, kMachInt32);
+  m.Return(m.ChangeInt32ToInt64(m.Parameter(0)));
+  Stream s = m.Build();
+  ASSERT_EQ(1U, s.size());
+  EXPECT_EQ(kArm64Sxtw, s[0]->arch_opcode());
+}
+
+
+TEST_F(InstructionSelectorTest, ChangeUint32ToUint64WithParameter) {
+  StreamBuilder m(this, kMachUint64, kMachUint32);
+  m.Return(m.ChangeUint32ToUint64(m.Parameter(0)));
+  Stream s = m.Build();
+  ASSERT_EQ(1U, s.size());
+  EXPECT_EQ(kArm64Mov32, s[0]->arch_opcode());
+}
+
+
+TEST_F(InstructionSelectorTest, TruncateInt64ToInt32WithParameter) {
+  StreamBuilder m(this, kMachInt32, kMachInt64);
+  m.Return(m.TruncateInt64ToInt32(m.Parameter(0)));
+  Stream s = m.Build();
+  ASSERT_EQ(1U, s.size());
+  EXPECT_EQ(kArm64Mov32, s[0]->arch_opcode());
+}
+
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8