[x64] Zero/sign-extend loads to 64-bit registers.

test/unittests/compiler/x64/instruction-selector-x64-unittest.cc

Index: test/unittests/compiler/x64/instruction-selector-x64-unittest.cc
diff --git a/test/unittests/compiler/x64/instruction-selector-x64-unittest.cc b/test/unittests/compiler/x64/instruction-selector-x64-unittest.cc
index d6ed73266cabaf990b956f36a76433c51dc6207e..b16182c592b43785f43f30dc5936a4fdc03fab4d 100644
--- a/test/unittests/compiler/x64/instruction-selector-x64-unittest.cc
+++ b/test/unittests/compiler/x64/instruction-selector-x64-unittest.cc
@@ -33,7 +33,6 @@ TEST_F(InstructionSelectorTest, ChangeInt32ToInt64WithParameter) {
   EXPECT_EQ(kX64Movsxlq, s[0]->arch_opcode());
 }
 
-
 TEST_F(InstructionSelectorTest, ChangeUint32ToFloat64WithParameter) {
   StreamBuilder m(this, MachineType::Float64(), MachineType::Uint32());
   m.Return(m.ChangeUint32ToFloat64(m.Parameter(0)));
@@ -71,6 +70,41 @@ TEST_F(InstructionSelectorTest, TruncateInt64ToInt32WithParameter) {
   EXPECT_EQ(kX64Movl, s[0]->arch_opcode());
 }
 
+namespace {
+struct LoadWithToInt64Extension {
+  MachineType type;
+  ArchOpcode expected_opcode;
+};
+
+std::ostream& operator<<(std::ostream& os,
+                         const LoadWithToInt64Extension& i32toi64) {
+  return os << i32toi64.type;
+}
+
+static const LoadWithToInt64Extension kLoadWithToInt64Extensions[] = {
+    {MachineType::Int8(), kX64Movsxbq},
+    {MachineType::Uint8(), kX64Movzxbq},
+    {MachineType::Int16(), kX64Movsxwq},
+    {MachineType::Uint16(), kX64Movzxwq},
+    {MachineType::Int32(), kX64Movsxlq}};
+
+}  // namespace
+
+typedef InstructionSelectorTestWithParam<LoadWithToInt64Extension>
+    InstructionSelectorChangeInt32ToInt64Test;
+
+TEST_P(InstructionSelectorChangeInt32ToInt64Test, ChangeInt32ToInt64WithLoad) {
+  const LoadWithToInt64Extension extension = GetParam();
+  StreamBuilder m(this, MachineType::Int64(), MachineType::Pointer());
+  m.Return(m.ChangeInt32ToInt64(m.Load(extension.type, m.Parameter(0))));
+  Stream s = m.Build();
+  ASSERT_EQ(1U, s.size());
+  EXPECT_EQ(extension.expected_opcode, s[0]->arch_opcode());
+}
+
+INSTANTIATE_TEST_CASE_P(InstructionSelectorTest,
+                        InstructionSelectorChangeInt32ToInt64Test,
+                        ::testing::ValuesIn(kLoadWithToInt64Extensions));
 
 // -----------------------------------------------------------------------------
 // Loads and stores