MIPS: [turbofan] Add matching rule to use Nor instruction.

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 5a61177b830de88661fa2288e7bd22a869943e2a..3f31422267287048e9abef3123e9cf795f6d92cd 100644
--- a/test/unittests/compiler/mips64/instruction-selector-mips64-unittest.cc
+++ b/test/unittests/compiler/mips64/instruction-selector-mips64-unittest.cc
@@ -400,6 +400,54 @@ INSTANTIATE_TEST_CASE_P(InstructionSelectorTest, InstructionSelectorLogicalTest,
                         ::testing::ValuesIn(kLogicalInstructions));
 
 
+TEST_F(InstructionSelectorTest, Word64XorMinusOneWithWord64Or) {
+  {
+    StreamBuilder m(this, kMachInt64, kMachInt64);
+    m.Return(m.Word64Xor(m.Word64Or(m.Parameter(0), m.Parameter(0)),
+                         m.Int64Constant(-1)));
+    Stream s = m.Build();
+    ASSERT_EQ(1U, s.size());
+    EXPECT_EQ(kMips64Nor, s[0]->arch_opcode());
+    EXPECT_EQ(2U, s[0]->InputCount());
+    EXPECT_EQ(1U, s[0]->OutputCount());
+  }
+  {
+    StreamBuilder m(this, kMachInt64, kMachInt64);
+    m.Return(m.Word64Xor(m.Int64Constant(-1),
+                         m.Word64Or(m.Parameter(0), m.Parameter(0))));
+    Stream s = m.Build();
+    ASSERT_EQ(1U, s.size());
+    EXPECT_EQ(kMips64Nor, s[0]->arch_opcode());
+    EXPECT_EQ(2U, s[0]->InputCount());
+    EXPECT_EQ(1U, s[0]->OutputCount());
+  }
+}
+
+
+TEST_F(InstructionSelectorTest, Word32XorMinusOneWithWord32Or) {
+  {
+    StreamBuilder m(this, kMachInt32, kMachInt32);
+    m.Return(m.Word32Xor(m.Word32Or(m.Parameter(0), m.Parameter(0)),
+                         m.Int32Constant(-1)));
+    Stream s = m.Build();
+    ASSERT_EQ(1U, s.size());
+    EXPECT_EQ(kMips64Nor, s[0]->arch_opcode());
+    EXPECT_EQ(2U, s[0]->InputCount());
+    EXPECT_EQ(1U, s[0]->OutputCount());
+  }
+  {
+    StreamBuilder m(this, kMachInt32, kMachInt32);
+    m.Return(m.Word32Xor(m.Int32Constant(-1),
+                         m.Word32Or(m.Parameter(0), m.Parameter(0))));
+    Stream s = m.Build();
+    ASSERT_EQ(1U, s.size());
+    EXPECT_EQ(kMips64Nor, s[0]->arch_opcode());
+    EXPECT_EQ(2U, s[0]->InputCount());
+    EXPECT_EQ(1U, s[0]->OutputCount());
+  }
+}
+
+
 TEST_F(InstructionSelectorTest, Word32AndWithImmediateWithWord32Shr) {
   // The available shift operand range is `0 <= imm < 32`, but we also test
   // that immediates outside this range are handled properly (modulo-32).