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

BUG=

Review-Url: https://codereview.chromium.org/2398993003
Cr-Commit-Position: refs/heads/master@{#42358}

src/compiler/raw-machine-assembler.h

@@ -653,6 +653,12 @@ class V8_EXPORT_PRIVATE RawMachineAssembler {
   Node* Float64RoundTiesEven(Node* a) {
     return AddNode(machine()->Float64RoundTiesEven().op(), a);
   }
+  Node* Word32ReverseBytes(Node* a) {
+    return AddNode(machine()->Word32ReverseBytes().op(), a);
+  }
+  Node* Word64ReverseBytes(Node* a) {
+    return AddNode(machine()->Word64ReverseBytes().op(), a);
+  }
 
   // Float64 bit operations.
   Node* Float64ExtractLowWord32(Node* a) {

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

@@ -1454,6 +1454,18 @@ TEST_F(InstructionSelectorTest, Float64Min) {
   EXPECT_EQ(s.ToVreg(n), s.ToVreg(s[0]->Output()));
 }
 
+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(kMipsByteSwap32, s[0]->arch_opcode());
+    EXPECT_EQ(1U, s[0]->InputCount());
+    EXPECT_EQ(1U, s[0]->OutputCount());
+  }
+}
+
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8

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