// Copyright 2021 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 "src/objects/objects-inl.h"
#include "test/unittests/compiler/backend/instruction-selector-unittest.h"

namespace v8 {
namespace internal {
namespace compiler {

namespace {
template <typename T>
struct MachInst {
  T constructor;
  const char* constructor_name;
  ArchOpcode arch_opcode;
  MachineType machine_type;
};

template <typename T>
std::ostream& operator<<(std::ostream& os, const MachInst<T>& mi) {
  return os << mi.constructor_name;
}

using MachInst1 = MachInst<Node* (RawMachineAssembler::*)(Node*)>;
using MachInst2 = MachInst<Node* (RawMachineAssembler::*)(Node*, Node*)>;

// To avoid duplicated code IntCmp helper structure
// is created. It contains MachInst2 with two nodes and expected_size
// because different cmp instructions have different size.
struct IntCmp {
  MachInst2 mi;
  uint32_t expected_size;
};

struct FPCmp {
  MachInst2 mi;
  FlagsCondition cond;
};

const FPCmp kFPCmpInstructions[] = {
    {{&RawMachineAssembler::Float64Equal, "Float64Equal", kLoong64Float64Cmp,
      MachineType::Float64()},
     kEqual},
    {{&RawMachineAssembler::Float64LessThan, "Float64LessThan",
      kLoong64Float64Cmp, MachineType::Float64()},
     kUnsignedLessThan},
    {{&RawMachineAssembler::Float64LessThanOrEqual, "Float64LessThanOrEqual",
      kLoong64Float64Cmp, MachineType::Float64()},
     kUnsignedLessThanOrEqual},
    {{&RawMachineAssembler::Float64GreaterThan, "Float64GreaterThan",
      kLoong64Float64Cmp, MachineType::Float64()},
     kUnsignedLessThan},
    {{&RawMachineAssembler::Float64GreaterThanOrEqual,
      "Float64GreaterThanOrEqual", kLoong64Float64Cmp, MachineType::Float64()},
     kUnsignedLessThanOrEqual}};

struct Conversion {
  // The machine_type field in MachInst1 represents the destination type.
  MachInst1 mi;
  MachineType src_machine_type;
};

// ----------------------------------------------------------------------------
// Logical instructions.
// ----------------------------------------------------------------------------

const MachInst2 kLogicalInstructions[] = {
    {&RawMachineAssembler::Word32And, "Word32And", kLoong64And32,
     MachineType::Int32()},
    {&RawMachineAssembler::Word64And, "Word64And", kLoong64And,
     MachineType::Int64()},
    {&RawMachineAssembler::Word32Or, "Word32Or", kLoong64Or32,
     MachineType::Int32()},
    {&RawMachineAssembler::Word64Or, "Word64Or", kLoong64Or,
     MachineType::Int64()},
    {&RawMachineAssembler::Word32Xor, "Word32Xor", kLoong64Xor32,
     MachineType::Int32()},
    {&RawMachineAssembler::Word64Xor, "Word64Xor", kLoong64Xor,
     MachineType::Int64()}};

// ----------------------------------------------------------------------------
// Shift instructions.
// ----------------------------------------------------------------------------

const MachInst2 kShiftInstructions[] = {
    {&RawMachineAssembler::Word32Shl, "Word32Shl", kLoong64Sll_w,
     MachineType::Int32()},
    {&RawMachineAssembler::Word64Shl, "Word64Shl", kLoong64Sll_d,
     MachineType::Int64()},
    {&RawMachineAssembler::Word32Shr, "Word32Shr", kLoong64Srl_w,
     MachineType::Int32()},
    {&RawMachineAssembler::Word64Shr, "Word64Shr", kLoong64Srl_d,
     MachineType::Int64()},
    {&RawMachineAssembler::Word32Sar, "Word32Sar", kLoong64Sra_w,
     MachineType::Int32()},
    {&RawMachineAssembler::Word64Sar, "Word64Sar", kLoong64Sra_d,
     MachineType::Int64()},
    {&RawMachineAssembler::Word32Ror, "Word32Ror", kLoong64Rotr_w,
     MachineType::Int32()},
    {&RawMachineAssembler::Word64Ror, "Word64Ror", kLoong64Rotr_d,
     MachineType::Int64()}};

// ----------------------------------------------------------------------------
// MUL/DIV instructions.
// ----------------------------------------------------------------------------

const MachInst2 kMulDivInstructions[] = {
    {&RawMachineAssembler::Int32Mul, "Int32Mul", kLoong64Mul_w,
     MachineType::Int32()},
    {&RawMachineAssembler::Int32Div, "Int32Div", kLoong64Div_w,
     MachineType::Int32()},
    {&RawMachineAssembler::Uint32Div, "Uint32Div", kLoong64Div_wu,
     MachineType::Uint32()},
    {&RawMachineAssembler::Int64Mul, "Int64Mul", kLoong64Mul_d,
     MachineType::Int64()},
    {&RawMachineAssembler::Int64Div, "Int64Div", kLoong64Div_d,
     MachineType::Int64()},
    {&RawMachineAssembler::Uint64Div, "Uint64Div", kLoong64Div_du,
     MachineType::Uint64()},
    {&RawMachineAssembler::Float64Mul, "Float64Mul", kLoong64Float64Mul,
     MachineType::Float64()},
    {&RawMachineAssembler::Float64Div, "Float64Div", kLoong64Float64Div,
     MachineType::Float64()}};

// ----------------------------------------------------------------------------
// MOD instructions.
// ----------------------------------------------------------------------------

const MachInst2 kModInstructions[] = {
    {&RawMachineAssembler::Int32Mod, "Int32Mod", kLoong64Mod_w,
     MachineType::Int32()},
    {&RawMachineAssembler::Uint32Mod, "Uint32Mod", kLoong64Mod_wu,
     MachineType::Int32()},
    {&RawMachineAssembler::Float64Mod, "Float64Mod", kLoong64Float64Mod,
     MachineType::Float64()}};

// ----------------------------------------------------------------------------
// Arithmetic FPU instructions.
// ----------------------------------------------------------------------------

const MachInst2 kFPArithInstructions[] = {
    {&RawMachineAssembler::Float64Add, "Float64Add", kLoong64Float64Add,
     MachineType::Float64()},
    {&RawMachineAssembler::Float64Sub, "Float64Sub", kLoong64Float64Sub,
     MachineType::Float64()}};

// ----------------------------------------------------------------------------
// IntArithTest instructions, two nodes.
// ----------------------------------------------------------------------------

const MachInst2 kAddSubInstructions[] = {
    {&RawMachineAssembler::Int32Add, "Int32Add", kLoong64Add_w,
     MachineType::Int32()},
    {&RawMachineAssembler::Int64Add, "Int64Add", kLoong64Add_d,
     MachineType::Int64()},
    {&RawMachineAssembler::Int32Sub, "Int32Sub", kLoong64Sub_w,
     MachineType::Int32()},
    {&RawMachineAssembler::Int64Sub, "Int64Sub", kLoong64Sub_d,
     MachineType::Int64()}};

// ----------------------------------------------------------------------------
// IntArithTest instructions, one node.
// ----------------------------------------------------------------------------

const MachInst1 kAddSubOneInstructions[] = {
    {&RawMachineAssembler::Int32Neg, "Int32Neg", kLoong64Sub_w,
     MachineType::Int32()},
    {&RawMachineAssembler::Int64Neg, "Int64Neg", kLoong64Sub_d,
     MachineType::Int64()}};

// ----------------------------------------------------------------------------
// Arithmetic compare instructions.
// ----------------------------------------------------------------------------

const IntCmp kCmpInstructions[] = {
    {{&RawMachineAssembler::WordEqual, "WordEqual", kLoong64Cmp64,
      MachineType::Int64()},
     1U},
    {{&RawMachineAssembler::WordNotEqual, "WordNotEqual", kLoong64Cmp64,
      MachineType::Int64()},
     1U},
    {{&RawMachineAssembler::Word32Equal, "Word32Equal", kLoong64Cmp32,
      MachineType::Int32()},
     1U},
    {{&RawMachineAssembler::Word32NotEqual, "Word32NotEqual", kLoong64Cmp32,
      MachineType::Int32()},
     1U},
    {{&RawMachineAssembler::Int32LessThan, "Int32LessThan", kLoong64Cmp32,
      MachineType::Int32()},
     1U},
    {{&RawMachineAssembler::Int32LessThanOrEqual, "Int32LessThanOrEqual",
      kLoong64Cmp32, MachineType::Int32()},
     1U},
    {{&RawMachineAssembler::Int32GreaterThan, "Int32GreaterThan", kLoong64Cmp32,
      MachineType::Int32()},
     1U},
    {{&RawMachineAssembler::Int32GreaterThanOrEqual, "Int32GreaterThanOrEqual",
      kLoong64Cmp32, MachineType::Int32()},
     1U},
    {{&RawMachineAssembler::Uint32LessThan, "Uint32LessThan", kLoong64Cmp32,
      MachineType::Uint32()},
     1U},
    {{&RawMachineAssembler::Uint32LessThanOrEqual, "Uint32LessThanOrEqual",
      kLoong64Cmp32, MachineType::Uint32()},
     1U}};

// ----------------------------------------------------------------------------
// Conversion instructions.
// ----------------------------------------------------------------------------

const Conversion kConversionInstructions[] = {
    // Conversion instructions are related to machine_operator.h:
    // FPU conversions:
    // Convert representation of integers between float64 and int32/uint32.
    // The precise rounding mode and handling of out of range inputs are *not*
    // defined for these operators, since they are intended only for use with
    // integers.
    {{&RawMachineAssembler::ChangeInt32ToFloat64, "ChangeInt32ToFloat64",
      kLoong64Int32ToFloat64, MachineType::Float64()},
     MachineType::Int32()},

    {{&RawMachineAssembler::ChangeUint32ToFloat64, "ChangeUint32ToFloat64",
      kLoong64Uint32ToFloat64, MachineType::Float64()},
     MachineType::Int32()},

    {{&RawMachineAssembler::ChangeFloat64ToInt32, "ChangeFloat64ToInt32",
      kLoong64Float64ToInt32, MachineType::Float64()},
     MachineType::Int32()},

    {{&RawMachineAssembler::ChangeFloat64ToUint32, "ChangeFloat64ToUint32",
      kLoong64Float64ToUint32, MachineType::Float64()},
     MachineType::Int32()}};

// LOONG64 instructions that clear the top 32 bits of the destination.
const MachInst2 kCanElideChangeUint32ToUint64[] = {
    {&RawMachineAssembler::Word32Equal, "Word32Equal", kLoong64Cmp32,
     MachineType::Uint32()},
    {&RawMachineAssembler::Int32LessThan, "Int32LessThan", kLoong64Cmp32,
     MachineType::Uint32()},
    {&RawMachineAssembler::Int32LessThanOrEqual, "Int32LessThanOrEqual",
     kLoong64Cmp32, MachineType::Uint32()},
    {&RawMachineAssembler::Uint32LessThan, "Uint32LessThan", kLoong64Cmp32,
     MachineType::Uint32()},
    {&RawMachineAssembler::Uint32LessThanOrEqual, "Uint32LessThanOrEqual",
     kLoong64Cmp32, MachineType::Uint32()},
};

}  // namespace

using InstructionSelectorFPCmpTest = InstructionSelectorTestWithParam<FPCmp>;

TEST_P(InstructionSelectorFPCmpTest, Parameter) {
  const FPCmp cmp = GetParam();
  StreamBuilder m(this, MachineType::Int32(), cmp.mi.machine_type,
                  cmp.mi.machine_type);
  m.Return((m.*cmp.mi.constructor)(m.Parameter(0), m.Parameter(1)));
  Stream s = m.Build();
  ASSERT_EQ(1U, s.size());
  EXPECT_EQ(cmp.mi.arch_opcode, s[0]->arch_opcode());
  EXPECT_EQ(2U, s[0]->InputCount());
  EXPECT_EQ(1U, s[0]->OutputCount());
  EXPECT_EQ(kFlags_set, s[0]->flags_mode());
  EXPECT_EQ(cmp.cond, s[0]->flags_condition());
}

INSTANTIATE_TEST_SUITE_P(InstructionSelectorTest, InstructionSelectorFPCmpTest,
                         ::testing::ValuesIn(kFPCmpInstructions));

// ----------------------------------------------------------------------------
// Arithmetic compare instructions integers
// ----------------------------------------------------------------------------

using InstructionSelectorCmpTest = InstructionSelectorTestWithParam<IntCmp>;

TEST_P(InstructionSelectorCmpTest, Parameter) {
  const IntCmp cmp = GetParam();
  const MachineType type = cmp.mi.machine_type;
  StreamBuilder m(this, type, type, type);
  m.Return((m.*cmp.mi.constructor)(m.Parameter(0), m.Parameter(1)));
  Stream s = m.Build();

  ASSERT_EQ(cmp.expected_size, s.size());
  EXPECT_EQ(cmp.mi.arch_opcode, s[0]->arch_opcode());
  EXPECT_EQ(2U, s[0]->InputCount());
  EXPECT_EQ(1U, s[0]->OutputCount());
}

INSTANTIATE_TEST_SUITE_P(InstructionSelectorTest, InstructionSelectorCmpTest,
                         ::testing::ValuesIn(kCmpInstructions));

// ----------------------------------------------------------------------------
// Shift instructions.
// ----------------------------------------------------------------------------

using InstructionSelectorShiftTest =
    InstructionSelectorTestWithParam<MachInst2>;

TEST_P(InstructionSelectorShiftTest, Immediate) {
  const MachInst2 dpi = GetParam();
  const MachineType type = dpi.machine_type;
  TRACED_FORRANGE(int32_t, imm, 0,
                  ((1 << ElementSizeLog2Of(type.representation())) * 8) - 1) {
    StreamBuilder m(this, type, type);
    m.Return((m.*dpi.constructor)(m.Parameter(0), m.Int32Constant(imm)));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(dpi.arch_opcode, s[0]->arch_opcode());
    EXPECT_EQ(2U, s[0]->InputCount());
    EXPECT_TRUE(s[0]->InputAt(1)->IsImmediate());
    EXPECT_EQ(imm, s.ToInt32(s[0]->InputAt(1)));
    EXPECT_EQ(1U, s[0]->OutputCount());
  }
}

INSTANTIATE_TEST_SUITE_P(InstructionSelectorTest, InstructionSelectorShiftTest,
                         ::testing::ValuesIn(kShiftInstructions));

TEST_F(InstructionSelectorTest, Word32ShrWithWord32AndWithImmediate) {
  // The available shift operand range is `0 <= imm < 32`, but we also test
  // that immediates outside this range are handled properly (modulo-32).
  TRACED_FORRANGE(int32_t, shift, -32, 63) {
    int32_t lsb = shift & 0x1F;
    TRACED_FORRANGE(int32_t, width, 1, 32 - lsb) {
      uint32_t jnk = rng()->NextInt();
      jnk = (lsb > 0) ? (jnk >> (32 - lsb)) : 0;
      uint32_t msk = ((0xFFFFFFFFu >> (32 - width)) << lsb) | jnk;
      StreamBuilder m(this, MachineType::Int32(), MachineType::Int32());
      m.Return(m.Word32Shr(m.Word32And(m.Parameter(0), m.Int32Constant(msk)),
                           m.Int32Constant(shift)));
      Stream s = m.Build();
      ASSERT_EQ(1U, s.size());
      EXPECT_EQ(kLoong64Bstrpick_w, s[0]->arch_opcode());
      ASSERT_EQ(3U, s[0]->InputCount());
      EXPECT_EQ(lsb, s.ToInt32(s[0]->InputAt(1)));
      EXPECT_EQ(width, s.ToInt32(s[0]->InputAt(2)));
    }
  }
  TRACED_FORRANGE(int32_t, shift, -32, 63) {
    int32_t lsb = shift & 0x1F;
    TRACED_FORRANGE(int32_t, width, 1, 32 - lsb) {
      uint32_t jnk = rng()->NextInt();
      jnk = (lsb > 0) ? (jnk >> (32 - lsb)) : 0;
      uint32_t msk = ((0xFFFFFFFFu >> (32 - width)) << lsb) | jnk;
      StreamBuilder m(this, MachineType::Int32(), MachineType::Int32());
      m.Return(m.Word32Shr(m.Word32And(m.Int32Constant(msk), m.Parameter(0)),
                           m.Int32Constant(shift)));
      Stream s = m.Build();
      ASSERT_EQ(1U, s.size());
      EXPECT_EQ(kLoong64Bstrpick_w, s[0]->arch_opcode());
      ASSERT_EQ(3U, s[0]->InputCount());
      EXPECT_EQ(lsb, s.ToInt32(s[0]->InputAt(1)));
      EXPECT_EQ(width, s.ToInt32(s[0]->InputAt(2)));
    }
  }
}

TEST_F(InstructionSelectorTest, Word64ShrWithWord64AndWithImmediate) {
  // The available shift operand range is `0 <= imm < 64`, but we also test
  // that immediates outside this range are handled properly (modulo-64).
  TRACED_FORRANGE(int32_t, shift, -64, 127) {
    int32_t lsb = shift & 0x3F;
    TRACED_FORRANGE(int32_t, width, 1, 64 - lsb) {
      uint64_t jnk = rng()->NextInt64();
      jnk = (lsb > 0) ? (jnk >> (64 - lsb)) : 0;
      uint64_t msk =
          ((uint64_t{0xFFFFFFFFFFFFFFFF} >> (64 - width)) << lsb) | jnk;
      StreamBuilder m(this, MachineType::Int64(), MachineType::Int64());
      m.Return(m.Word64Shr(m.Word64And(m.Parameter(0), m.Int64Constant(msk)),
                           m.Int64Constant(shift)));
      Stream s = m.Build();
      ASSERT_EQ(1U, s.size());
      EXPECT_EQ(kLoong64Bstrpick_d, s[0]->arch_opcode());
      ASSERT_EQ(3U, s[0]->InputCount());
      EXPECT_EQ(lsb, s.ToInt64(s[0]->InputAt(1)));
      EXPECT_EQ(width, s.ToInt64(s[0]->InputAt(2)));
    }
  }
  TRACED_FORRANGE(int32_t, shift, -64, 127) {
    int32_t lsb = shift & 0x3F;
    TRACED_FORRANGE(int32_t, width, 1, 64 - lsb) {
      uint64_t jnk = rng()->NextInt64();
      jnk = (lsb > 0) ? (jnk >> (64 - lsb)) : 0;
      uint64_t msk =
          ((uint64_t{0xFFFFFFFFFFFFFFFF} >> (64 - width)) << lsb) | jnk;
      StreamBuilder m(this, MachineType::Int64(), MachineType::Int64());
      m.Return(m.Word64Shr(m.Word64And(m.Int64Constant(msk), m.Parameter(0)),
                           m.Int64Constant(shift)));
      Stream s = m.Build();
      ASSERT_EQ(1U, s.size());
      EXPECT_EQ(kLoong64Bstrpick_d, s[0]->arch_opcode());
      ASSERT_EQ(3U, s[0]->InputCount());
      EXPECT_EQ(lsb, s.ToInt64(s[0]->InputAt(1)));
      EXPECT_EQ(width, s.ToInt64(s[0]->InputAt(2)));
    }
  }
}

TEST_F(InstructionSelectorTest, Word32AndToClearBits) {
  TRACED_FORRANGE(int32_t, shift, 1, 31) {
    int32_t mask = ~((1 << shift) - 1);
    StreamBuilder m(this, MachineType::Int32(), MachineType::Int32());
    m.Return(m.Word32And(m.Parameter(0), m.Int32Constant(mask)));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Bstrins_w, s[0]->arch_opcode());
    ASSERT_EQ(3U, s[0]->InputCount());
    EXPECT_EQ(0, s.ToInt32(s[0]->InputAt(1)));
    EXPECT_EQ(shift, s.ToInt32(s[0]->InputAt(2)));
  }
  TRACED_FORRANGE(int32_t, shift, 1, 31) {
    int32_t mask = ~((1 << shift) - 1);
    StreamBuilder m(this, MachineType::Int32(), MachineType::Int32());
    m.Return(m.Word32And(m.Int32Constant(mask), m.Parameter(0)));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Bstrins_w, s[0]->arch_opcode());
    ASSERT_EQ(3U, s[0]->InputCount());
    EXPECT_EQ(0, s.ToInt32(s[0]->InputAt(1)));
    EXPECT_EQ(shift, s.ToInt32(s[0]->InputAt(2)));
  }
}

TEST_F(InstructionSelectorTest, Word64AndToClearBits) {
  TRACED_FORRANGE(int32_t, shift, 1, 31) {
    int64_t mask = ~((1 << shift) - 1);
    StreamBuilder m(this, MachineType::Int64(), MachineType::Int64());
    m.Return(m.Word64And(m.Parameter(0), m.Int64Constant(mask)));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Bstrins_d, s[0]->arch_opcode());
    ASSERT_EQ(3U, s[0]->InputCount());
    EXPECT_EQ(0, s.ToInt32(s[0]->InputAt(1)));
    EXPECT_EQ(shift, s.ToInt32(s[0]->InputAt(2)));
  }
  TRACED_FORRANGE(int32_t, shift, 1, 31) {
    int64_t mask = ~((1 << shift) - 1);
    StreamBuilder m(this, MachineType::Int64(), MachineType::Int64());
    m.Return(m.Word64And(m.Int64Constant(mask), m.Parameter(0)));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Bstrins_d, s[0]->arch_opcode());
    ASSERT_EQ(3U, s[0]->InputCount());
    EXPECT_EQ(0, s.ToInt32(s[0]->InputAt(1)));
    EXPECT_EQ(shift, s.ToInt32(s[0]->InputAt(2)));
  }
}

// ----------------------------------------------------------------------------
// Logical instructions.
// ----------------------------------------------------------------------------

using InstructionSelectorLogicalTest =
    InstructionSelectorTestWithParam<MachInst2>;

TEST_P(InstructionSelectorLogicalTest, Parameter) {
  const MachInst2 dpi = GetParam();
  const MachineType type = dpi.machine_type;
  StreamBuilder m(this, type, type, type);
  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());
  EXPECT_EQ(2U, s[0]->InputCount());
  EXPECT_EQ(1U, s[0]->OutputCount());
}

INSTANTIATE_TEST_SUITE_P(InstructionSelectorTest,
                         InstructionSelectorLogicalTest,
                         ::testing::ValuesIn(kLogicalInstructions));

TEST_F(InstructionSelectorTest, Word64XorMinusOneWithParameter) {
  {
    StreamBuilder m(this, MachineType::Int64(), MachineType::Int64());
    m.Return(m.Word64Xor(m.Parameter(0), m.Int64Constant(-1)));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Nor, s[0]->arch_opcode());
    EXPECT_EQ(2U, s[0]->InputCount());
    EXPECT_EQ(1U, s[0]->OutputCount());
  }
  {
    StreamBuilder m(this, MachineType::Int64(), MachineType::Int64());
    m.Return(m.Word64Xor(m.Int64Constant(-1), m.Parameter(0)));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Nor, s[0]->arch_opcode());
    EXPECT_EQ(2U, s[0]->InputCount());
    EXPECT_EQ(1U, s[0]->OutputCount());
  }
}

TEST_F(InstructionSelectorTest, Word32XorMinusOneWithParameter) {
  {
    StreamBuilder m(this, MachineType::Int32(), MachineType::Int32());
    m.Return(m.Word32Xor(m.Parameter(0), m.Int32Constant(-1)));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Nor32, s[0]->arch_opcode());
    EXPECT_EQ(2U, s[0]->InputCount());
    EXPECT_EQ(1U, s[0]->OutputCount());
  }
  {
    StreamBuilder m(this, MachineType::Int32(), MachineType::Int32());
    m.Return(m.Word32Xor(m.Int32Constant(-1), m.Parameter(0)));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Nor32, s[0]->arch_opcode());
    EXPECT_EQ(2U, s[0]->InputCount());
    EXPECT_EQ(1U, s[0]->OutputCount());
  }
}

TEST_F(InstructionSelectorTest, Word64XorMinusOneWithWord64Or) {
  {
    StreamBuilder m(this, MachineType::Int64(), MachineType::Int64());
    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(kLoong64Nor, s[0]->arch_opcode());
    EXPECT_EQ(2U, s[0]->InputCount());
    EXPECT_EQ(1U, s[0]->OutputCount());
  }
  {
    StreamBuilder m(this, MachineType::Int64(), MachineType::Int64());
    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(kLoong64Nor, s[0]->arch_opcode());
    EXPECT_EQ(2U, s[0]->InputCount());
    EXPECT_EQ(1U, s[0]->OutputCount());
  }
}

TEST_F(InstructionSelectorTest, Word32XorMinusOneWithWord32Or) {
  {
    StreamBuilder m(this, MachineType::Int32(), MachineType::Int32());
    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(kLoong64Nor32, s[0]->arch_opcode());
    EXPECT_EQ(2U, s[0]->InputCount());
    EXPECT_EQ(1U, s[0]->OutputCount());
  }
  {
    StreamBuilder m(this, MachineType::Int32(), MachineType::Int32());
    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(kLoong64Nor32, 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).
  TRACED_FORRANGE(int32_t, shift, -32, 63) {
    int32_t lsb = shift & 0x1F;
    TRACED_FORRANGE(int32_t, width, 1, 31) {
      uint32_t msk = (1 << width) - 1;
      StreamBuilder m(this, MachineType::Int32(), MachineType::Int32());
      m.Return(m.Word32And(m.Word32Shr(m.Parameter(0), m.Int32Constant(shift)),
                           m.Int32Constant(msk)));
      Stream s = m.Build();
      ASSERT_EQ(1U, s.size());
      EXPECT_EQ(kLoong64Bstrpick_w, s[0]->arch_opcode());
      ASSERT_EQ(3U, s[0]->InputCount());
      EXPECT_EQ(lsb, s.ToInt32(s[0]->InputAt(1)));
      int32_t actual_width = (lsb + width > 32) ? (32 - lsb) : width;
      EXPECT_EQ(actual_width, s.ToInt32(s[0]->InputAt(2)));
    }
  }
  TRACED_FORRANGE(int32_t, shift, -32, 63) {
    int32_t lsb = shift & 0x1F;
    TRACED_FORRANGE(int32_t, width, 1, 31) {
      uint32_t msk = (1 << width) - 1;
      StreamBuilder m(this, MachineType::Int32(), MachineType::Int32());
      m.Return(
          m.Word32And(m.Int32Constant(msk),
                      m.Word32Shr(m.Parameter(0), m.Int32Constant(shift))));
      Stream s = m.Build();
      ASSERT_EQ(1U, s.size());
      EXPECT_EQ(kLoong64Bstrpick_w, s[0]->arch_opcode());
      ASSERT_EQ(3U, s[0]->InputCount());
      EXPECT_EQ(lsb, s.ToInt32(s[0]->InputAt(1)));
      int32_t actual_width = (lsb + width > 32) ? (32 - lsb) : width;
      EXPECT_EQ(actual_width, s.ToInt32(s[0]->InputAt(2)));
    }
  }
}

TEST_F(InstructionSelectorTest, Word32ShlWithWord32And) {
  TRACED_FORRANGE(int32_t, shift, 0, 30) {
    StreamBuilder m(this, MachineType::Int32(), MachineType::Int32());
    Node* const p0 = m.Parameter(0);
    Node* const r =
        m.Word32Shl(m.Word32And(p0, m.Int32Constant((1 << (31 - shift)) - 1)),
                    m.Int32Constant(shift + 1));
    m.Return(r);
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Sll_w, s[0]->arch_opcode());
    ASSERT_EQ(2U, s[0]->InputCount());
    EXPECT_EQ(s.ToVreg(p0), s.ToVreg(s[0]->InputAt(0)));
    ASSERT_EQ(1U, s[0]->OutputCount());
    EXPECT_EQ(s.ToVreg(r), s.ToVreg(s[0]->Output()));
  }
}

TEST_F(InstructionSelectorTest, Word64ShlWithWord64And) {
  TRACED_FORRANGE(int32_t, shift, 0, 62) {
    StreamBuilder m(this, MachineType::Int64(), MachineType::Int64());
    Node* const p0 = m.Parameter(0);
    Node* const r =
        m.Word64Shl(m.Word64And(p0, m.Int64Constant((1L << (63 - shift)) - 1)),
                    m.Int64Constant(shift + 1));
    m.Return(r);
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Sll_d, s[0]->arch_opcode());
    ASSERT_EQ(2U, s[0]->InputCount());
    EXPECT_EQ(s.ToVreg(p0), s.ToVreg(s[0]->InputAt(0)));
    ASSERT_EQ(1U, s[0]->OutputCount());
    EXPECT_EQ(s.ToVreg(r), s.ToVreg(s[0]->Output()));
  }
}

TEST_F(InstructionSelectorTest, Word32SarWithWord32Shl) {
  {
    StreamBuilder m(this, MachineType::Int32(), MachineType::Int32());
    Node* const p0 = m.Parameter(0);
    Node* const r =
        m.Word32Sar(m.Word32Shl(p0, m.Int32Constant(24)), m.Int32Constant(24));
    m.Return(r);
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Ext_w_b, s[0]->arch_opcode());
    ASSERT_EQ(1U, s[0]->InputCount());
    EXPECT_EQ(s.ToVreg(p0), s.ToVreg(s[0]->InputAt(0)));
    ASSERT_EQ(1U, s[0]->OutputCount());
    EXPECT_EQ(s.ToVreg(r), s.ToVreg(s[0]->Output()));
  }
  {
    StreamBuilder m(this, MachineType::Int32(), MachineType::Int32());
    Node* const p0 = m.Parameter(0);
    Node* const r =
        m.Word32Sar(m.Word32Shl(p0, m.Int32Constant(16)), m.Int32Constant(16));
    m.Return(r);
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Ext_w_h, s[0]->arch_opcode());
    ASSERT_EQ(1U, s[0]->InputCount());
    EXPECT_EQ(s.ToVreg(p0), s.ToVreg(s[0]->InputAt(0)));
    ASSERT_EQ(1U, s[0]->OutputCount());
    EXPECT_EQ(s.ToVreg(r), s.ToVreg(s[0]->Output()));
  }
  {
    StreamBuilder m(this, MachineType::Int32(), MachineType::Int32());
    Node* const p0 = m.Parameter(0);
    Node* const r =
        m.Word32Sar(m.Word32Shl(p0, m.Int32Constant(32)), m.Int32Constant(32));
    m.Return(r);
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Sll_w, s[0]->arch_opcode());
    ASSERT_EQ(2U, s[0]->InputCount());
    EXPECT_EQ(s.ToVreg(p0), s.ToVreg(s[0]->InputAt(0)));
    EXPECT_EQ(0, s.ToInt32(s[0]->InputAt(1)));
    ASSERT_EQ(1U, s[0]->OutputCount());
    EXPECT_EQ(s.ToVreg(r), s.ToVreg(s[0]->Output()));
  }
}

// ----------------------------------------------------------------------------
// MUL/DIV instructions.
// ----------------------------------------------------------------------------

using InstructionSelectorMulDivTest =
    InstructionSelectorTestWithParam<MachInst2>;

TEST_P(InstructionSelectorMulDivTest, Parameter) {
  const MachInst2 dpi = GetParam();
  const MachineType type = dpi.machine_type;
  StreamBuilder m(this, type, type, type);
  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());
  EXPECT_EQ(2U, s[0]->InputCount());
  EXPECT_EQ(1U, s[0]->OutputCount());
}

INSTANTIATE_TEST_SUITE_P(InstructionSelectorTest, InstructionSelectorMulDivTest,
                         ::testing::ValuesIn(kMulDivInstructions));

// ----------------------------------------------------------------------------
// MOD instructions.
// ----------------------------------------------------------------------------

using InstructionSelectorModTest = InstructionSelectorTestWithParam<MachInst2>;

TEST_P(InstructionSelectorModTest, Parameter) {
  const MachInst2 dpi = GetParam();
  const MachineType type = dpi.machine_type;
  StreamBuilder m(this, type, type, type);
  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());
  EXPECT_EQ(2U, s[0]->InputCount());
  EXPECT_EQ(1U, s[0]->OutputCount());
}

INSTANTIATE_TEST_SUITE_P(InstructionSelectorTest, InstructionSelectorModTest,
                         ::testing::ValuesIn(kModInstructions));

// ----------------------------------------------------------------------------
// Floating point instructions.
// ----------------------------------------------------------------------------

using InstructionSelectorFPArithTest =
    InstructionSelectorTestWithParam<MachInst2>;

TEST_P(InstructionSelectorFPArithTest, Parameter) {
  const MachInst2 fpa = GetParam();
  StreamBuilder m(this, fpa.machine_type, fpa.machine_type, fpa.machine_type);
  m.Return((m.*fpa.constructor)(m.Parameter(0), m.Parameter(1)));
  Stream s = m.Build();
  ASSERT_EQ(1U, s.size());
  EXPECT_EQ(fpa.arch_opcode, s[0]->arch_opcode());
  EXPECT_EQ(2U, s[0]->InputCount());
  EXPECT_EQ(1U, s[0]->OutputCount());
}

INSTANTIATE_TEST_SUITE_P(InstructionSelectorTest,
                         InstructionSelectorFPArithTest,
                         ::testing::ValuesIn(kFPArithInstructions));

// ----------------------------------------------------------------------------
// Integer arithmetic
// ----------------------------------------------------------------------------
using InstructionSelectorIntArithTwoTest =
    InstructionSelectorTestWithParam<MachInst2>;

TEST_P(InstructionSelectorIntArithTwoTest, Parameter) {
  const MachInst2 intpa = GetParam();
  StreamBuilder m(this, intpa.machine_type, intpa.machine_type,
                  intpa.machine_type);
  m.Return((m.*intpa.constructor)(m.Parameter(0), m.Parameter(1)));
  Stream s = m.Build();
  ASSERT_EQ(1U, s.size());
  EXPECT_EQ(intpa.arch_opcode, s[0]->arch_opcode());
  EXPECT_EQ(2U, s[0]->InputCount());
  EXPECT_EQ(1U, s[0]->OutputCount());
}

INSTANTIATE_TEST_SUITE_P(InstructionSelectorTest,
                         InstructionSelectorIntArithTwoTest,
                         ::testing::ValuesIn(kAddSubInstructions));

// ----------------------------------------------------------------------------
// One node.
// ----------------------------------------------------------------------------

using InstructionSelectorIntArithOneTest =
    InstructionSelectorTestWithParam<MachInst1>;

TEST_P(InstructionSelectorIntArithOneTest, Parameter) {
  const MachInst1 intpa = GetParam();
  StreamBuilder m(this, intpa.machine_type, intpa.machine_type,
                  intpa.machine_type);
  m.Return((m.*intpa.constructor)(m.Parameter(0)));
  Stream s = m.Build();
  ASSERT_EQ(1U, s.size());
  EXPECT_EQ(intpa.arch_opcode, s[0]->arch_opcode());
  EXPECT_EQ(2U, s[0]->InputCount());
  EXPECT_EQ(1U, s[0]->OutputCount());
}

INSTANTIATE_TEST_SUITE_P(InstructionSelectorTest,
                         InstructionSelectorIntArithOneTest,
                         ::testing::ValuesIn(kAddSubOneInstructions));

// ----------------------------------------------------------------------------
// Conversions.
// ----------------------------------------------------------------------------

using InstructionSelectorConversionTest =
    InstructionSelectorTestWithParam<Conversion>;

TEST_P(InstructionSelectorConversionTest, Parameter) {
  const Conversion conv = GetParam();
  StreamBuilder m(this, conv.mi.machine_type, conv.src_machine_type);
  m.Return((m.*conv.mi.constructor)(m.Parameter(0)));
  Stream s = m.Build();
  ASSERT_EQ(1U, s.size());
  EXPECT_EQ(conv.mi.arch_opcode, s[0]->arch_opcode());
  EXPECT_EQ(1U, s[0]->InputCount());
  EXPECT_EQ(1U, s[0]->OutputCount());
}

INSTANTIATE_TEST_SUITE_P(InstructionSelectorTest,
                         InstructionSelectorConversionTest,
                         ::testing::ValuesIn(kConversionInstructions));

TEST_F(InstructionSelectorTest, ChangesFromToSmi) {
  {
    StreamBuilder m(this, MachineType::Int32(), MachineType::Int32());
    m.Return(m.TruncateInt64ToInt32(
        m.Word64Sar(m.Parameter(0), m.Int32Constant(32))));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Sra_d, s[0]->arch_opcode());
    EXPECT_EQ(kMode_None, s[0]->addressing_mode());
    ASSERT_EQ(2U, s[0]->InputCount());
    EXPECT_EQ(1U, s[0]->OutputCount());
  }
  {
    StreamBuilder m(this, MachineType::Int32(), MachineType::Int32());
    m.Return(
        m.Word64Shl(m.ChangeInt32ToInt64(m.Parameter(0)), m.Int32Constant(32)));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Sll_d, s[0]->arch_opcode());
    ASSERT_EQ(2U, s[0]->InputCount());
    EXPECT_EQ(1U, s[0]->OutputCount());
  }
}

TEST_F(InstructionSelectorTest, ChangeFloat64ToInt32OfChangeFloat32ToFloat64) {
  {
    StreamBuilder m(this, MachineType::Int32(), MachineType::Float32());
    m.Return(m.ChangeFloat64ToInt32(m.ChangeFloat32ToFloat64(m.Parameter(0))));
    Stream s = m.Build();
    ASSERT_EQ(2U, s.size());
    EXPECT_EQ(kLoong64Float32ToFloat64, s[0]->arch_opcode());
    EXPECT_EQ(kLoong64Float64ToInt32, s[1]->arch_opcode());
    EXPECT_EQ(kMode_None, s[0]->addressing_mode());
    ASSERT_EQ(1U, s[0]->InputCount());
    EXPECT_EQ(1U, s[0]->OutputCount());
  }
}

TEST_F(InstructionSelectorTest,
       TruncateFloat64ToFloat32OfChangeInt32ToFloat64) {
  {
    StreamBuilder m(this, MachineType::Float32(), MachineType::Int32());
    m.Return(
        m.TruncateFloat64ToFloat32(m.ChangeInt32ToFloat64(m.Parameter(0))));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Int32ToFloat32, s[0]->arch_opcode());
    EXPECT_EQ(kMode_None, s[0]->addressing_mode());
    ASSERT_EQ(1U, s[0]->InputCount());
    EXPECT_EQ(1U, s[0]->OutputCount());
  }
}

TEST_F(InstructionSelectorTest, CombineShiftsWithMul) {
  {
    StreamBuilder m(this, MachineType::Int32(), MachineType::Int32());
    m.Return(m.Int32Mul(m.Word64Sar(m.Parameter(0), m.Int32Constant(32)),
                        m.Word64Sar(m.Parameter(0), m.Int32Constant(32))));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Mulh_d, s[0]->arch_opcode());
    EXPECT_EQ(kMode_None, s[0]->addressing_mode());
    ASSERT_EQ(2U, s[0]->InputCount());
    EXPECT_EQ(1U, s[0]->OutputCount());
  }
}

TEST_F(InstructionSelectorTest, CombineShiftsWithDivMod) {
  {
    StreamBuilder m(this, MachineType::Int32(), MachineType::Int32());
    m.Return(m.Int32Div(m.Word64Sar(m.Parameter(0), m.Int32Constant(32)),
                        m.Word64Sar(m.Parameter(0), m.Int32Constant(32))));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Div_d, s[0]->arch_opcode());
    EXPECT_EQ(kMode_None, s[0]->addressing_mode());
    ASSERT_EQ(2U, s[0]->InputCount());
    EXPECT_EQ(1U, s[0]->OutputCount());
  }
  {
    StreamBuilder m(this, MachineType::Int32(), MachineType::Int32());
    m.Return(m.Int32Mod(m.Word64Sar(m.Parameter(0), m.Int32Constant(32)),
                        m.Word64Sar(m.Parameter(0), m.Int32Constant(32))));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Mod_d, s[0]->arch_opcode());
    EXPECT_EQ(kMode_None, s[0]->addressing_mode());
    ASSERT_EQ(2U, s[0]->InputCount());
    EXPECT_EQ(1U, s[0]->OutputCount());
  }
}

TEST_F(InstructionSelectorTest, ChangeInt32ToInt64AfterLoad) {
  // For each case, test that the conversion is merged into the load
  // operation.
  // ChangeInt32ToInt64(Load_Uint8) -> Ld_bu
  {
    StreamBuilder m(this, MachineType::Int64(), MachineType::Pointer(),
                    MachineType::Int32());
    m.Return(m.ChangeInt32ToInt64(
        m.Load(MachineType::Uint8(), m.Parameter(0), m.Parameter(1))));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Ld_bu, s[0]->arch_opcode());
    EXPECT_EQ(kMode_MRR, s[0]->addressing_mode());
    EXPECT_EQ(2U, s[0]->InputCount());
    EXPECT_EQ(1U, s[0]->OutputCount());
  }
  // ChangeInt32ToInt64(Load_Int8) -> Ld_b
  {
    StreamBuilder m(this, MachineType::Int64(), MachineType::Pointer(),
                    MachineType::Int32());
    m.Return(m.ChangeInt32ToInt64(
        m.Load(MachineType::Int8(), m.Parameter(0), m.Parameter(1))));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Ld_b, s[0]->arch_opcode());
    EXPECT_EQ(kMode_MRR, s[0]->addressing_mode());
    EXPECT_EQ(2U, s[0]->InputCount());
    EXPECT_EQ(1U, s[0]->OutputCount());
  }
  // ChangeInt32ToInt64(Load_Uint16) -> Ld_hu
  {
    StreamBuilder m(this, MachineType::Int64(), MachineType::Pointer(),
                    MachineType::Int32());
    m.Return(m.ChangeInt32ToInt64(
        m.Load(MachineType::Uint16(), m.Parameter(0), m.Parameter(1))));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Ld_hu, s[0]->arch_opcode());
    EXPECT_EQ(kMode_MRR, s[0]->addressing_mode());
    EXPECT_EQ(2U, s[0]->InputCount());
    EXPECT_EQ(1U, s[0]->OutputCount());
  }
  // ChangeInt32ToInt64(Load_Int16) -> Ld_h
  {
    StreamBuilder m(this, MachineType::Int64(), MachineType::Pointer(),
                    MachineType::Int32());
    m.Return(m.ChangeInt32ToInt64(
        m.Load(MachineType::Int16(), m.Parameter(0), m.Parameter(1))));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Ld_h, s[0]->arch_opcode());
    EXPECT_EQ(kMode_MRR, s[0]->addressing_mode());
    EXPECT_EQ(2U, s[0]->InputCount());
    EXPECT_EQ(1U, s[0]->OutputCount());
  }
  // ChangeInt32ToInt64(Load_Uint32) -> Ld_w
  {
    StreamBuilder m(this, MachineType::Int64(), MachineType::Pointer(),
                    MachineType::Int32());
    m.Return(m.ChangeInt32ToInt64(
        m.Load(MachineType::Uint32(), m.Parameter(0), m.Parameter(1))));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Ld_w, s[0]->arch_opcode());
    EXPECT_EQ(kMode_MRR, s[0]->addressing_mode());
    EXPECT_EQ(2U, s[0]->InputCount());
    EXPECT_EQ(1U, s[0]->OutputCount());
  }
  // ChangeInt32ToInt64(Load_Int32) -> Ld_w
  {
    StreamBuilder m(this, MachineType::Int64(), MachineType::Pointer(),
                    MachineType::Int32());
    m.Return(m.ChangeInt32ToInt64(
        m.Load(MachineType::Int32(), m.Parameter(0), m.Parameter(1))));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Ld_w, s[0]->arch_opcode());
    EXPECT_EQ(kMode_MRR, s[0]->addressing_mode());
    EXPECT_EQ(2U, s[0]->InputCount());
    EXPECT_EQ(1U, s[0]->OutputCount());
  }
}

using InstructionSelectorElidedChangeUint32ToUint64Test =
    InstructionSelectorTestWithParam<MachInst2>;

TEST_P(InstructionSelectorElidedChangeUint32ToUint64Test, Parameter) {
  const MachInst2 binop = GetParam();
  StreamBuilder m(this, MachineType::Uint64(), binop.machine_type,
                  binop.machine_type);
  m.Return(m.ChangeUint32ToUint64(
      (m.*binop.constructor)(m.Parameter(0), m.Parameter(1))));
  Stream s = m.Build();
  // Make sure the `ChangeUint32ToUint64` node turned into a no-op.
  ASSERT_EQ(1U, s.size());
  EXPECT_EQ(binop.arch_opcode, s[0]->arch_opcode());
  EXPECT_EQ(2U, s[0]->InputCount());
  EXPECT_EQ(1U, s[0]->OutputCount());
}

INSTANTIATE_TEST_SUITE_P(InstructionSelectorTest,
                         InstructionSelectorElidedChangeUint32ToUint64Test,
                         ::testing::ValuesIn(kCanElideChangeUint32ToUint64));

TEST_F(InstructionSelectorTest, ChangeUint32ToUint64AfterLoad) {
  // For each case, make sure the `ChangeUint32ToUint64` node turned into a
  // no-op.

  // Ld_bu
  {
    StreamBuilder m(this, MachineType::Uint64(), MachineType::Pointer(),
                    MachineType::Int32());
    m.Return(m.ChangeUint32ToUint64(
        m.Load(MachineType::Uint8(), m.Parameter(0), m.Parameter(1))));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Ld_bu, s[0]->arch_opcode());
    EXPECT_EQ(kMode_MRR, s[0]->addressing_mode());
    EXPECT_EQ(2U, s[0]->InputCount());
    EXPECT_EQ(1U, s[0]->OutputCount());
  }
  // Ld_hu
  {
    StreamBuilder m(this, MachineType::Uint64(), MachineType::Pointer(),
                    MachineType::Int32());
    m.Return(m.ChangeUint32ToUint64(
        m.Load(MachineType::Uint16(), m.Parameter(0), m.Parameter(1))));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Ld_hu, s[0]->arch_opcode());
    EXPECT_EQ(kMode_MRR, s[0]->addressing_mode());
    EXPECT_EQ(2U, s[0]->InputCount());
    EXPECT_EQ(1U, s[0]->OutputCount());
  }
  // Ld_wu
  {
    StreamBuilder m(this, MachineType::Uint64(), MachineType::Pointer(),
                    MachineType::Int32());
    m.Return(m.ChangeUint32ToUint64(
        m.Load(MachineType::Uint32(), m.Parameter(0), m.Parameter(1))));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Ld_wu, s[0]->arch_opcode());
    EXPECT_EQ(kMode_MRR, s[0]->addressing_mode());
    EXPECT_EQ(2U, s[0]->InputCount());
    EXPECT_EQ(1U, s[0]->OutputCount());
  }
}

// ----------------------------------------------------------------------------
// Loads and stores.
// ----------------------------------------------------------------------------

namespace {

struct MemoryAccess {
  MachineType type;
  ArchOpcode load_opcode;
  ArchOpcode store_opcode;
};

static const MemoryAccess kMemoryAccesses[] = {
    {MachineType::Int8(), kLoong64Ld_b, kLoong64St_b},
    {MachineType::Uint8(), kLoong64Ld_bu, kLoong64St_b},
    {MachineType::Int16(), kLoong64Ld_h, kLoong64St_h},
    {MachineType::Uint16(), kLoong64Ld_hu, kLoong64St_h},
    {MachineType::Int32(), kLoong64Ld_w, kLoong64St_w},
    {MachineType::Float32(), kLoong64Fld_s, kLoong64Fst_s},
    {MachineType::Float64(), kLoong64Fld_d, kLoong64Fst_d},
    {MachineType::Int64(), kLoong64Ld_d, kLoong64St_d}};

struct MemoryAccessImm {
  MachineType type;
  ArchOpcode load_opcode;
  ArchOpcode store_opcode;
  bool (InstructionSelectorTest::Stream::*val_predicate)(
      const InstructionOperand*) const;
  const int32_t immediates[40];
};

std::ostream& operator<<(std::ostream& os, const MemoryAccessImm& acc) {
  return os << acc.type;
}

struct MemoryAccessImm1 {
  MachineType type;
  ArchOpcode load_opcode;
  ArchOpcode store_opcode;
  bool (InstructionSelectorTest::Stream::*val_predicate)(
      const InstructionOperand*) const;
  const int32_t immediates[5];
};

std::ostream& operator<<(std::ostream& os, const MemoryAccessImm1& acc) {
  return os << acc.type;
}

struct MemoryAccessImm2 {
  MachineType type;
  ArchOpcode store_opcode;
  ArchOpcode store_opcode_unaligned;
  bool (InstructionSelectorTest::Stream::*val_predicate)(
      const InstructionOperand*) const;
  const int32_t immediates[40];
};

// ----------------------------------------------------------------------------
// Loads and stores immediate values
// ----------------------------------------------------------------------------

const MemoryAccessImm kMemoryAccessesImm[] = {
    {MachineType::Int8(),
     kLoong64Ld_b,
     kLoong64St_b,
     &InstructionSelectorTest::Stream::IsInteger,
     {-4095, -3340, -3231, -3224, -3088, -1758, -1203, -123, -117, -91,
      -89,   -87,   -86,   -82,   -44,   -23,   -3,    0,    7,    10,
      39,    52,    69,    71,    91,    92,    107,   109,  115,  124,
      286,   655,   1362,  1569,  2587,  3067,  3096,  3462, 3510, 4095}},
    {MachineType::Uint8(),
     kLoong64Ld_bu,
     kLoong64St_b,
     &InstructionSelectorTest::Stream::IsInteger,
     {-4095, -3340, -3231, -3224, -3088, -1758, -1203, -123, -117, -91,
      -89,   -87,   -86,   -82,   -44,   -23,   -3,    0,    7,    10,
      39,    52,    69,    71,    91,    92,    107,   109,  115,  124,
      286,   655,   1362,  1569,  2587,  3067,  3096,  3462, 3510, 4095}},
    {MachineType::Int16(),
     kLoong64Ld_h,
     kLoong64St_h,
     &InstructionSelectorTest::Stream::IsInteger,
     {-4095, -3340, -3231, -3224, -3088, -1758, -1203, -123, -117, -91,
      -89,   -87,   -86,   -82,   -44,   -23,   -3,    0,    7,    10,
      39,    52,    69,    71,    91,    92,    107,   109,  115,  124,
      286,   655,   1362,  1569,  2587,  3067,  3096,  3462, 3510, 4095}},
    {MachineType::Uint16(),
     kLoong64Ld_hu,
     kLoong64St_h,
     &InstructionSelectorTest::Stream::IsInteger,
     {-4095, -3340, -3231, -3224, -3088, -1758, -1203, -123, -117, -91,
      -89,   -87,   -86,   -82,   -44,   -23,   -3,    0,    7,    10,
      39,    52,    69,    71,    91,    92,    107,   109,  115,  124,
      286,   655,   1362,  1569,  2587,  3067,  3096,  3462, 3510, 4095}},
    {MachineType::Int32(),
     kLoong64Ld_w,
     kLoong64St_w,
     &InstructionSelectorTest::Stream::IsInteger,
     {-4095, -3340, -3231, -3224, -3088, -1758, -1203, -123, -117, -91,
      -89,   -87,   -86,   -82,   -44,   -23,   -3,    0,    7,    10,
      39,    52,    69,    71,    91,    92,    107,   109,  115,  124,
      286,   655,   1362,  1569,  2587,  3067,  3096,  3462, 3510, 4095}},
    {MachineType::Float32(),
     kLoong64Fld_s,
     kLoong64Fst_s,
     &InstructionSelectorTest::Stream::IsDouble,
     {-4095, -3340, -3231, -3224, -3088, -1758, -1203, -123, -117, -91,
      -89,   -87,   -86,   -82,   -44,   -23,   -3,    0,    7,    10,
      39,    52,    69,    71,    91,    92,    107,   109,  115,  124,
      286,   655,   1362,  1569,  2587,  3067,  3096,  3462, 3510, 4095}},
    {MachineType::Float64(),
     kLoong64Fld_d,
     kLoong64Fst_d,
     &InstructionSelectorTest::Stream::IsDouble,
     {-4095, -3340, -3231, -3224, -3088, -1758, -1203, -123, -117, -91,
      -89,   -87,   -86,   -82,   -44,   -23,   -3,    0,    7,    10,
      39,    52,    69,    71,    91,    92,    107,   109,  115,  124,
      286,   655,   1362,  1569,  2587,  3067,  3096,  3462, 3510, 4095}},
    {MachineType::Int64(),
     kLoong64Ld_d,
     kLoong64St_d,
     &InstructionSelectorTest::Stream::IsInteger,
     {-4095, -3340, -3231, -3224, -3088, -1758, -1203, -123, -117, -91,
      -89,   -87,   -86,   -82,   -44,   -23,   -3,    0,    7,    10,
      39,    52,    69,    71,    91,    92,    107,   109,  115,  124,
      286,   655,   1362,  1569,  2587,  3067,  3096,  3462, 3510, 4095}}};

const MemoryAccessImm1 kMemoryAccessImmMoreThan16bit[] = {
    {MachineType::Int8(),
     kLoong64Ld_b,
     kLoong64St_b,
     &InstructionSelectorTest::Stream::IsInteger,
     {-65000, -55000, 32777, 55000, 65000}},
    {MachineType::Uint8(),
     kLoong64Ld_bu,
     kLoong64St_b,
     &InstructionSelectorTest::Stream::IsInteger,
     {-65000, -55000, 32777, 55000, 65000}},
    {MachineType::Int16(),
     kLoong64Ld_h,
     kLoong64St_h,
     &InstructionSelectorTest::Stream::IsInteger,
     {-65000, -55000, 32777, 55000, 65000}},
    {MachineType::Uint16(),
     kLoong64Ld_hu,
     kLoong64St_h,
     &InstructionSelectorTest::Stream::IsInteger,
     {-65000, -55000, 32777, 55000, 65000}},
    {MachineType::Int32(),
     kLoong64Ld_w,
     kLoong64St_w,
     &InstructionSelectorTest::Stream::IsInteger,
     {-65000, -55000, 32777, 55000, 65000}},
    {MachineType::Float32(),
     kLoong64Fld_s,
     kLoong64Fst_s,
     &InstructionSelectorTest::Stream::IsDouble,
     {-65000, -55000, 32777, 55000, 65000}},
    {MachineType::Float64(),
     kLoong64Fld_d,
     kLoong64Fst_d,
     &InstructionSelectorTest::Stream::IsDouble,
     {-65000, -55000, 32777, 55000, 65000}},
    {MachineType::Int64(),
     kLoong64Ld_d,
     kLoong64St_d,
     &InstructionSelectorTest::Stream::IsInteger,
     {-65000, -55000, 32777, 55000, 65000}}};

}  // namespace

using InstructionSelectorMemoryAccessTest =
    InstructionSelectorTestWithParam<MemoryAccess>;

TEST_P(InstructionSelectorMemoryAccessTest, LoadWithParameters) {
  const MemoryAccess memacc = GetParam();
  StreamBuilder m(this, memacc.type, MachineType::Pointer(),
                  MachineType::Int32());
  m.Return(m.Load(memacc.type, m.Parameter(0)));
  Stream s = m.Build();
  ASSERT_EQ(1U, s.size());
  EXPECT_EQ(memacc.load_opcode, s[0]->arch_opcode());
  EXPECT_EQ(kMode_MRI, s[0]->addressing_mode());
}

TEST_P(InstructionSelectorMemoryAccessTest, StoreWithParameters) {
  const MemoryAccess memacc = GetParam();
  StreamBuilder m(this, MachineType::Int32(), MachineType::Pointer(),
                  MachineType::Int32(), memacc.type);
  m.Store(memacc.type.representation(), m.Parameter(0), m.Parameter(1),
          kNoWriteBarrier);
  m.Return(m.Int32Constant(0));
  Stream s = m.Build();
  ASSERT_EQ(1U, s.size());
  EXPECT_EQ(memacc.store_opcode, s[0]->arch_opcode());
  EXPECT_EQ(kMode_MRI, s[0]->addressing_mode());
}

INSTANTIATE_TEST_SUITE_P(InstructionSelectorTest,
                         InstructionSelectorMemoryAccessTest,
                         ::testing::ValuesIn(kMemoryAccesses));

// ----------------------------------------------------------------------------
// Load immediate.
// ----------------------------------------------------------------------------

using InstructionSelectorMemoryAccessImmTest =
    InstructionSelectorTestWithParam<MemoryAccessImm>;

TEST_P(InstructionSelectorMemoryAccessImmTest, LoadWithImmediateIndex) {
  const MemoryAccessImm memacc = GetParam();
  TRACED_FOREACH(int32_t, index, memacc.immediates) {
    StreamBuilder m(this, memacc.type, MachineType::Pointer());
    m.Return(m.Load(memacc.type, m.Parameter(0), m.Int32Constant(index)));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(memacc.load_opcode, s[0]->arch_opcode());
    EXPECT_EQ(kMode_MRI, s[0]->addressing_mode());
    ASSERT_EQ(2U, s[0]->InputCount());
    ASSERT_EQ(InstructionOperand::IMMEDIATE, s[0]->InputAt(1)->kind());
    EXPECT_EQ(index, s.ToInt32(s[0]->InputAt(1)));
    ASSERT_EQ(1U, s[0]->OutputCount());
    EXPECT_TRUE((s.*memacc.val_predicate)(s[0]->Output()));
  }
}

// ----------------------------------------------------------------------------
// Store immediate.
// ----------------------------------------------------------------------------

TEST_P(InstructionSelectorMemoryAccessImmTest, StoreWithImmediateIndex) {
  const MemoryAccessImm memacc = GetParam();
  TRACED_FOREACH(int32_t, index, memacc.immediates) {
    StreamBuilder m(this, MachineType::Int32(), MachineType::Pointer(),
                    memacc.type);
    m.Store(memacc.type.representation(), m.Parameter(0),
            m.Int32Constant(index), m.Parameter(1), kNoWriteBarrier);
    m.Return(m.Int32Constant(0));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(memacc.store_opcode, s[0]->arch_opcode());
    EXPECT_EQ(kMode_MRI, s[0]->addressing_mode());
    ASSERT_EQ(3U, s[0]->InputCount());
    ASSERT_EQ(InstructionOperand::IMMEDIATE, s[0]->InputAt(1)->kind());
    EXPECT_EQ(index, s.ToInt32(s[0]->InputAt(1)));
    EXPECT_EQ(0U, s[0]->OutputCount());
  }
}

TEST_P(InstructionSelectorMemoryAccessImmTest, StoreZero) {
  const MemoryAccessImm memacc = GetParam();
  TRACED_FOREACH(int32_t, index, memacc.immediates) {
    StreamBuilder m(this, MachineType::Int32(), MachineType::Pointer());
    m.Store(memacc.type.representation(), m.Parameter(0),
            m.Int32Constant(index), m.Int32Constant(0), kNoWriteBarrier);
    m.Return(m.Int32Constant(0));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(memacc.store_opcode, s[0]->arch_opcode());
    EXPECT_EQ(kMode_MRI, s[0]->addressing_mode());
    ASSERT_EQ(3U, s[0]->InputCount());
    ASSERT_EQ(InstructionOperand::IMMEDIATE, s[0]->InputAt(1)->kind());
    EXPECT_EQ(index, s.ToInt32(s[0]->InputAt(1)));
    ASSERT_EQ(InstructionOperand::IMMEDIATE, s[0]->InputAt(2)->kind());
    EXPECT_EQ(0, s.ToInt64(s[0]->InputAt(2)));
    EXPECT_EQ(0U, s[0]->OutputCount());
  }
}

INSTANTIATE_TEST_SUITE_P(InstructionSelectorTest,
                         InstructionSelectorMemoryAccessImmTest,
                         ::testing::ValuesIn(kMemoryAccessesImm));

// ----------------------------------------------------------------------------
// Load/store offsets more than 16 bits.
// ----------------------------------------------------------------------------

using InstructionSelectorMemoryAccessImmMoreThan16bitTest =
    InstructionSelectorTestWithParam<MemoryAccessImm1>;

TEST_P(InstructionSelectorMemoryAccessImmMoreThan16bitTest,
       LoadWithImmediateIndex) {
  const MemoryAccessImm1 memacc = GetParam();
  TRACED_FOREACH(int32_t, index, memacc.immediates) {
    StreamBuilder m(this, memacc.type, MachineType::Pointer());
    m.Return(m.Load(memacc.type, m.Parameter(0), m.Int32Constant(index)));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(memacc.load_opcode, s[0]->arch_opcode());
    EXPECT_EQ(kMode_MRR, s[0]->addressing_mode());
    EXPECT_EQ(2U, s[0]->InputCount());
    EXPECT_EQ(1U, s[0]->OutputCount());
  }
}

TEST_P(InstructionSelectorMemoryAccessImmMoreThan16bitTest,
       StoreWithImmediateIndex) {
  const MemoryAccessImm1 memacc = GetParam();
  TRACED_FOREACH(int32_t, index, memacc.immediates) {
    StreamBuilder m(this, MachineType::Int32(), MachineType::Pointer(),
                    memacc.type);
    m.Store(memacc.type.representation(), m.Parameter(0),
            m.Int32Constant(index), m.Parameter(1), kNoWriteBarrier);
    m.Return(m.Int32Constant(0));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(memacc.store_opcode, s[0]->arch_opcode());
    EXPECT_EQ(kMode_MRR, s[0]->addressing_mode());
    EXPECT_EQ(3U, s[0]->InputCount());
    EXPECT_EQ(0U, s[0]->OutputCount());
  }
}

INSTANTIATE_TEST_SUITE_P(InstructionSelectorTest,
                         InstructionSelectorMemoryAccessImmMoreThan16bitTest,
                         ::testing::ValuesIn(kMemoryAccessImmMoreThan16bit));

// ----------------------------------------------------------------------------
// kLoong64Cmp with zero testing.
// ----------------------------------------------------------------------------

TEST_F(InstructionSelectorTest, Word32EqualWithZero) {
  {
    StreamBuilder m(this, MachineType::Int32(), MachineType::Int32());
    m.Return(m.Word32Equal(m.Parameter(0), m.Int32Constant(0)));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Cmp32, s[0]->arch_opcode());
    EXPECT_EQ(kMode_None, s[0]->addressing_mode());
    ASSERT_EQ(2U, s[0]->InputCount());
    EXPECT_EQ(1U, s[0]->OutputCount());
    EXPECT_EQ(kFlags_set, s[0]->flags_mode());
    EXPECT_EQ(kEqual, s[0]->flags_condition());
  }
  {
    StreamBuilder m(this, MachineType::Int32(), MachineType::Int32());
    m.Return(m.Word32Equal(m.Int32Constant(0), m.Parameter(0)));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Cmp32, s[0]->arch_opcode());
    EXPECT_EQ(kMode_None, s[0]->addressing_mode());
    ASSERT_EQ(2U, s[0]->InputCount());
    EXPECT_EQ(1U, s[0]->OutputCount());
    EXPECT_EQ(kFlags_set, s[0]->flags_mode());
    EXPECT_EQ(kEqual, s[0]->flags_condition());
  }
}

TEST_F(InstructionSelectorTest, Word64EqualWithZero) {
  {
    StreamBuilder m(this, MachineType::Int64(), MachineType::Int64());
    m.Return(m.Word64Equal(m.Parameter(0), m.Int64Constant(0)));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Cmp64, s[0]->arch_opcode());
    EXPECT_EQ(kMode_None, s[0]->addressing_mode());
    ASSERT_EQ(2U, s[0]->InputCount());
    EXPECT_EQ(1U, s[0]->OutputCount());
    EXPECT_EQ(kFlags_set, s[0]->flags_mode());
    EXPECT_EQ(kEqual, s[0]->flags_condition());
  }
  {
    StreamBuilder m(this, MachineType::Int64(), MachineType::Int64());
    m.Return(m.Word64Equal(m.Int32Constant(0), m.Parameter(0)));
    Stream s = m.Build();
    ASSERT_EQ(1U, s.size());
    EXPECT_EQ(kLoong64Cmp64, s[0]->arch_opcode());
    EXPECT_EQ(kMode_None, s[0]->addressing_mode());
    ASSERT_EQ(2U, s[0]->InputCount());
    EXPECT_EQ(1U, s[0]->OutputCount());
    EXPECT_EQ(kFlags_set, s[0]->flags_mode());
    EXPECT_EQ(kEqual, s[0]->flags_condition());
  }
}

TEST_F(InstructionSelectorTest, Word32Clz) {
  StreamBuilder m(this, MachineType::Uint32(), MachineType::Uint32());
  Node* const p0 = m.Parameter(0);
  Node* const n = m.Word32Clz(p0);
  m.Return(n);
  Stream s = m.Build();
  ASSERT_EQ(1U, s.size());
  EXPECT_EQ(kLoong64Clz_w, s[0]->arch_opcode());
  ASSERT_EQ(1U, s[0]->InputCount());
  EXPECT_EQ(s.ToVreg(p0), s.ToVreg(s[0]->InputAt(0)));
  ASSERT_EQ(1U, s[0]->OutputCount());
  EXPECT_EQ(s.ToVreg(n), s.ToVreg(s[0]->Output()));
}

TEST_F(InstructionSelectorTest, Word64Clz) {
  StreamBuilder m(this, MachineType::Uint64(), MachineType::Uint64());
  Node* const p0 = m.Parameter(0);
  Node* const n = m.Word64Clz(p0);
  m.Return(n);
  Stream s = m.Build();
  ASSERT_EQ(1U, s.size());
  EXPECT_EQ(kLoong64Clz_d, s[0]->arch_opcode());
  ASSERT_EQ(1U, s[0]->InputCount());
  EXPECT_EQ(s.ToVreg(p0), s.ToVreg(s[0]->InputAt(0)));
  ASSERT_EQ(1U, s[0]->OutputCount());
  EXPECT_EQ(s.ToVreg(n), s.ToVreg(s[0]->Output()));
}

TEST_F(InstructionSelectorTest, Float32Abs) {
  StreamBuilder m(this, MachineType::Float32(), MachineType::Float32());
  Node* const p0 = m.Parameter(0);
  Node* const n = m.Float32Abs(p0);
  m.Return(n);
  Stream s = m.Build();
  ASSERT_EQ(1U, s.size());
  EXPECT_EQ(kLoong64Float32Abs, s[0]->arch_opcode());
  ASSERT_EQ(1U, s[0]->InputCount());
  EXPECT_EQ(s.ToVreg(p0), s.ToVreg(s[0]->InputAt(0)));
  ASSERT_EQ(1U, s[0]->OutputCount());
  EXPECT_EQ(s.ToVreg(n), s.ToVreg(s[0]->Output()));
}

TEST_F(InstructionSelectorTest, Float64Abs) {
  StreamBuilder m(this, MachineType::Float64(), MachineType::Float64());
  Node* const p0 = m.Parameter(0);
  Node* const n = m.Float64Abs(p0);
  m.Return(n);
  Stream s = m.Build();
  ASSERT_EQ(1U, s.size());
  EXPECT_EQ(kLoong64Float64Abs, s[0]->arch_opcode());
  ASSERT_EQ(1U, s[0]->InputCount());
  EXPECT_EQ(s.ToVreg(p0), s.ToVreg(s[0]->InputAt(0)));
  ASSERT_EQ(1U, s[0]->OutputCount());
  EXPECT_EQ(s.ToVreg(n), s.ToVreg(s[0]->Output()));
}

TEST_F(InstructionSelectorTest, Float64Max) {
  StreamBuilder m(this, MachineType::Float64(), MachineType::Float64(),
                  MachineType::Float64());
  Node* const p0 = m.Parameter(0);
  Node* const p1 = m.Parameter(1);
  Node* const n = m.Float64Max(p0, p1);
  m.Return(n);
  Stream s = m.Build();
  ASSERT_EQ(1U, s.size());
  EXPECT_EQ(kLoong64Float64Max, s[0]->arch_opcode());
  ASSERT_EQ(2U, s[0]->InputCount());
  ASSERT_EQ(1U, s[0]->OutputCount());
  EXPECT_EQ(s.ToVreg(n), s.ToVreg(s[0]->Output()));
}

TEST_F(InstructionSelectorTest, Float64Min) {
  StreamBuilder m(this, MachineType::Float64(), MachineType::Float64(),
                  MachineType::Float64());
  Node* const p0 = m.Parameter(0);
  Node* const p1 = m.Parameter(1);
  Node* const n = m.Float64Min(p0, p1);
  m.Return(n);
  Stream s = m.Build();
  ASSERT_EQ(1U, s.size());
  EXPECT_EQ(kLoong64Float64Min, s[0]->arch_opcode());
  ASSERT_EQ(2U, s[0]->InputCount());
  ASSERT_EQ(1U, s[0]->OutputCount());
  EXPECT_EQ(s.ToVreg(n), s.ToVreg(s[0]->Output()));
}

TEST_F(InstructionSelectorTest, LoadAndShiftRight) {
  {
    int32_t immediates[] = {-256, -255, -3,   -2,   -1,    0,    1,
                            2,    3,    255,  256,  260,   4096, 4100,
                            8192, 8196, 3276, 3280, 16376, 16380};
    TRACED_FOREACH(int32_t, index, immediates) {
      StreamBuilder m(this, MachineType::Uint64(), MachineType::Pointer());
      Node* const load =
          m.Load(MachineType::Uint64(), m.Parameter(0), m.Int32Constant(index));
      Node* const sar = m.Word64Sar(load, m.Int32Constant(32));
      // Make sure we don't fold the shift into the following add:
      m.Return(m.Int64Add(sar, m.Parameter(0)));
      Stream s = m.Build();
      ASSERT_EQ(2U, s.size());
      EXPECT_EQ(kLoong64Ld_w, s[0]->arch_opcode());
      EXPECT_EQ(kMode_MRI, s[0]->addressing_mode());
      EXPECT_EQ(2U, s[0]->InputCount());
      EXPECT_EQ(s.ToVreg(m.Parameter(0)), s.ToVreg(s[0]->InputAt(0)));
      ASSERT_EQ(InstructionOperand::IMMEDIATE, s[0]->InputAt(1)->kind());
      EXPECT_EQ(index + 4, s.ToInt32(s[0]->InputAt(1)));
      ASSERT_EQ(1U, s[0]->OutputCount());
    }
  }
}

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(kLoong64ByteSwap32, 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(kLoong64ByteSwap64, s[0]->arch_opcode());
    EXPECT_EQ(1U, s[0]->InputCount());
    EXPECT_EQ(1U, s[0]->OutputCount());
  }
}

}  // namespace compiler
}  // namespace internal
}  // namespace v8