MIPS[64]: Implement Word[32|64]ReverseByte instruction selector unit tests

test/unittests/compiler/mips64/instruction-selector-mips64-unittest.cc

Index: test/unittests/compiler/mips64/instruction-selector-mips64-unittest.cc
diff --git a/test/unittests/compiler/mips64/instruction-selector-mips64-unittest.cc b/test/unittests/compiler/mips64/instruction-selector-mips64-unittest.cc
index e9b84b1238379ce2d4113382f4d65b3083ce1580..97fd7bfc37a9b20c49be1da58bcb81b1c549f1ba 100644
--- a/test/unittests/compiler/mips64/instruction-selector-mips64-unittest.cc
+++ b/test/unittests/compiler/mips64/instruction-selector-mips64-unittest.cc
@@ -1964,6 +1964,30 @@ TEST_F(InstructionSelectorTest, LoadAndShiftRight) {
   }
 }
 
+TEST_F(InstructionSelectorTest, Word32ReverseBytes) {
+  {
+    StreamBuilder m(this, MachineType::Int32(), MachineType::Int32());
+    m.Return(m.Word32ReverseBytes(m.Parameter(0)));
+    Stream s = m.Build();
+    ASSERT_EQ(1U, s.size());
+    EXPECT_EQ(kMips64ByteSwap32, s[0]->arch_opcode());
+    EXPECT_EQ(1U, s[0]->InputCount());
+    EXPECT_EQ(1U, s[0]->OutputCount());
+  }
+}
+
+TEST_F(InstructionSelectorTest, Word64ReverseBytes) {
+  {
+    StreamBuilder m(this, MachineType::Int64(), MachineType::Int64());
+    m.Return(m.Word64ReverseBytes(m.Parameter(0)));
+    Stream s = m.Build();
+    ASSERT_EQ(1U, s.size());
+    EXPECT_EQ(kMips64ByteSwap64, s[0]->arch_opcode());
+    EXPECT_EQ(1U, s[0]->InputCount());
+    EXPECT_EQ(1U, s[0]->OutputCount());
+  }
+}
+
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8