// 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 "test/cctest/wasm/wasm-simd-utils.h"

#include <cmath>

#include "src/base/logging.h"
#include "src/base/memory.h"
#include "src/common/globals.h"
#include "src/wasm/compilation-environment.h"
#include "src/wasm/value-type.h"
#include "src/wasm/wasm-opcodes.h"
#include "test/cctest/compiler/c-signature.h"
#include "test/cctest/compiler/value-helper.h"
#include "test/cctest/wasm/wasm-run-utils.h"
#include "test/common/wasm/wasm-macro-gen.h"

namespace v8 {
namespace internal {
namespace wasm {
void RunI8x16UnOpTest(TestExecutionTier execution_tier, WasmOpcode opcode,
                      Int8UnOp expected_op) {
  WasmRunner<int32_t, int32_t> r(execution_tier);
  // Global to hold output.
  int8_t* g = r.builder().AddGlobal<int8_t>(kWasmS128);
  // Build fn to splat test value, perform unop, and write the result.
  byte value = 0;
  byte temp1 = r.AllocateLocal(kWasmS128);
  BUILD(r, WASM_LOCAL_SET(temp1, WASM_SIMD_I8x16_SPLAT(WASM_LOCAL_GET(value))),
        WASM_GLOBAL_SET(0, WASM_SIMD_UNOP(opcode, WASM_LOCAL_GET(temp1))),
        WASM_ONE);

  FOR_INT8_INPUTS(x) {
    r.Call(x);
    int8_t expected = expected_op(x);
    for (int i = 0; i < 16; i++) {
      CHECK_EQ(expected, ReadLittleEndianValue<int8_t>(&g[i]));
    }
  }
}

template <typename T, typename OpType>
void RunI8x16BinOpTest(TestExecutionTier execution_tier, WasmOpcode opcode,
                       OpType expected_op) {
  WasmRunner<int32_t, T, T> r(execution_tier);
  // Global to hold output.
  T* g = r.builder().template AddGlobal<T>(kWasmS128);
  // Build fn to splat test values, perform binop, and write the result.
  byte value1 = 0, value2 = 1;
  byte temp1 = r.AllocateLocal(kWasmS128);
  byte temp2 = r.AllocateLocal(kWasmS128);
  BUILD(r, WASM_LOCAL_SET(temp1, WASM_SIMD_I8x16_SPLAT(WASM_LOCAL_GET(value1))),
        WASM_LOCAL_SET(temp2, WASM_SIMD_I8x16_SPLAT(WASM_LOCAL_GET(value2))),
        WASM_GLOBAL_SET(0, WASM_SIMD_BINOP(opcode, WASM_LOCAL_GET(temp1),
                                           WASM_LOCAL_GET(temp2))),
        WASM_ONE);

  for (T x : compiler::ValueHelper::GetVector<T>()) {
    for (T y : compiler::ValueHelper::GetVector<T>()) {
      r.Call(x, y);
      T expected = expected_op(x, y);
      for (int i = 0; i < 16; i++) {
        CHECK_EQ(expected, ReadLittleEndianValue<T>(&g[i]));
      }
    }
  }
}

// Explicit instantiations of uses.
template void RunI8x16BinOpTest<int8_t>(TestExecutionTier, WasmOpcode,
                                        Int8BinOp);

template void RunI8x16BinOpTest<uint8_t>(TestExecutionTier, WasmOpcode,
                                         Uint8BinOp);

void RunI8x16ShiftOpTest(TestExecutionTier execution_tier, WasmOpcode opcode,
                         Int8ShiftOp expected_op) {
  // Intentionally shift by 8, should be no-op.
  for (int shift = 1; shift <= 8; shift++) {
    WasmRunner<int32_t, int32_t> r(execution_tier);
    int32_t* memory = r.builder().AddMemoryElems<int32_t>(1);
    int8_t* g_imm = r.builder().AddGlobal<int8_t>(kWasmS128);
    int8_t* g_mem = r.builder().AddGlobal<int8_t>(kWasmS128);
    byte value = 0;
    byte simd = r.AllocateLocal(kWasmS128);
    // Shift using an immediate, and shift using a value loaded from memory.
    BUILD(
        r, WASM_LOCAL_SET(simd, WASM_SIMD_I8x16_SPLAT(WASM_LOCAL_GET(value))),
        WASM_GLOBAL_SET(0, WASM_SIMD_SHIFT_OP(opcode, WASM_LOCAL_GET(simd),
                                              WASM_I32V(shift))),
        WASM_GLOBAL_SET(1, WASM_SIMD_SHIFT_OP(
                               opcode, WASM_LOCAL_GET(simd),
                               WASM_LOAD_MEM(MachineType::Int32(), WASM_ZERO))),
        WASM_ONE);

    r.builder().WriteMemory(&memory[0], shift);
    FOR_INT8_INPUTS(x) {
      r.Call(x);
      int8_t expected = expected_op(x, shift);
      for (int i = 0; i < 16; i++) {
        CHECK_EQ(expected, ReadLittleEndianValue<int8_t>(&g_imm[i]));
        CHECK_EQ(expected, ReadLittleEndianValue<int8_t>(&g_mem[i]));
      }
    }
  }
}

void RunI8x16MixedRelationalOpTest(TestExecutionTier execution_tier,
                                   WasmOpcode opcode, Int8BinOp expected_op) {
  WasmRunner<int32_t, int32_t, int32_t> r(execution_tier);
  byte value1 = 0, value2 = 1;
  byte temp1 = r.AllocateLocal(kWasmS128);
  byte temp2 = r.AllocateLocal(kWasmS128);
  byte temp3 = r.AllocateLocal(kWasmS128);
  BUILD(r, WASM_LOCAL_SET(temp1, WASM_SIMD_I8x16_SPLAT(WASM_LOCAL_GET(value1))),
        WASM_LOCAL_SET(temp2, WASM_SIMD_I16x8_SPLAT(WASM_LOCAL_GET(value2))),
        WASM_LOCAL_SET(temp3, WASM_SIMD_BINOP(opcode, WASM_LOCAL_GET(temp1),
                                              WASM_LOCAL_GET(temp2))),
        WASM_SIMD_I8x16_EXTRACT_LANE(0, WASM_LOCAL_GET(temp3)));

  CHECK_EQ(expected_op(0xff, static_cast<uint8_t>(0x7fff)),
           r.Call(0xff, 0x7fff));
  CHECK_EQ(expected_op(0xfe, static_cast<uint8_t>(0x7fff)),
           r.Call(0xfe, 0x7fff));
  CHECK_EQ(expected_op(0xff, static_cast<uint8_t>(0x7ffe)),
           r.Call(0xff, 0x7ffe));
}

void RunI16x8UnOpTest(TestExecutionTier execution_tier, WasmOpcode opcode,
                      Int16UnOp expected_op) {
  WasmRunner<int32_t, int32_t> r(execution_tier);
  // Global to hold output.
  int16_t* g = r.builder().AddGlobal<int16_t>(kWasmS128);
  // Build fn to splat test value, perform unop, and write the result.
  byte value = 0;
  byte temp1 = r.AllocateLocal(kWasmS128);
  BUILD(r, WASM_LOCAL_SET(temp1, WASM_SIMD_I16x8_SPLAT(WASM_LOCAL_GET(value))),
        WASM_GLOBAL_SET(0, WASM_SIMD_UNOP(opcode, WASM_LOCAL_GET(temp1))),
        WASM_ONE);

  FOR_INT16_INPUTS(x) {
    r.Call(x);
    int16_t expected = expected_op(x);
    for (int i = 0; i < 8; i++) {
      CHECK_EQ(expected, ReadLittleEndianValue<int16_t>(&g[i]));
    }
  }
}

template <typename T, typename OpType>
void RunI16x8BinOpTest(TestExecutionTier execution_tier, WasmOpcode opcode,
                       OpType expected_op) {
  WasmRunner<int32_t, T, T> r(execution_tier);
  // Global to hold output.
  T* g = r.builder().template AddGlobal<T>(kWasmS128);
  // Build fn to splat test values, perform binop, and write the result.
  byte value1 = 0, value2 = 1;
  byte temp1 = r.AllocateLocal(kWasmS128);
  byte temp2 = r.AllocateLocal(kWasmS128);
  BUILD(r, WASM_LOCAL_SET(temp1, WASM_SIMD_I16x8_SPLAT(WASM_LOCAL_GET(value1))),
        WASM_LOCAL_SET(temp2, WASM_SIMD_I16x8_SPLAT(WASM_LOCAL_GET(value2))),
        WASM_GLOBAL_SET(0, WASM_SIMD_BINOP(opcode, WASM_LOCAL_GET(temp1),
                                           WASM_LOCAL_GET(temp2))),
        WASM_ONE);

  for (T x : compiler::ValueHelper::GetVector<T>()) {
    for (T y : compiler::ValueHelper::GetVector<T>()) {
      r.Call(x, y);
      T expected = expected_op(x, y);
      for (int i = 0; i < 8; i++) {
        CHECK_EQ(expected, ReadLittleEndianValue<T>(&g[i]));
      }
    }
  }
}

// Explicit instantiations of uses.
template void RunI16x8BinOpTest<int16_t>(TestExecutionTier, WasmOpcode,
                                         Int16BinOp);
template void RunI16x8BinOpTest<uint16_t>(TestExecutionTier, WasmOpcode,
                                          Uint16BinOp);

void RunI16x8ShiftOpTest(TestExecutionTier execution_tier, WasmOpcode opcode,
                         Int16ShiftOp expected_op) {
  // Intentionally shift by 16, should be no-op.
  for (int shift = 1; shift <= 16; shift++) {
    WasmRunner<int32_t, int32_t> r(execution_tier);
    int32_t* memory = r.builder().AddMemoryElems<int32_t>(1);
    int16_t* g_imm = r.builder().AddGlobal<int16_t>(kWasmS128);
    int16_t* g_mem = r.builder().AddGlobal<int16_t>(kWasmS128);
    byte value = 0;
    byte simd = r.AllocateLocal(kWasmS128);
    // Shift using an immediate, and shift using a value loaded from memory.
    BUILD(
        r, WASM_LOCAL_SET(simd, WASM_SIMD_I16x8_SPLAT(WASM_LOCAL_GET(value))),
        WASM_GLOBAL_SET(0, WASM_SIMD_SHIFT_OP(opcode, WASM_LOCAL_GET(simd),
                                              WASM_I32V(shift))),
        WASM_GLOBAL_SET(1, WASM_SIMD_SHIFT_OP(
                               opcode, WASM_LOCAL_GET(simd),
                               WASM_LOAD_MEM(MachineType::Int32(), WASM_ZERO))),
        WASM_ONE);

    r.builder().WriteMemory(&memory[0], shift);
    FOR_INT16_INPUTS(x) {
      r.Call(x);
      int16_t expected = expected_op(x, shift);
      for (int i = 0; i < 8; i++) {
        CHECK_EQ(expected, ReadLittleEndianValue<int16_t>(&g_imm[i]));
        CHECK_EQ(expected, ReadLittleEndianValue<int16_t>(&g_mem[i]));
      }
    }
  }
}

void RunI16x8MixedRelationalOpTest(TestExecutionTier execution_tier,
                                   WasmOpcode opcode, Int16BinOp expected_op) {
  WasmRunner<int32_t, int32_t, int32_t> r(execution_tier);
  byte value1 = 0, value2 = 1;
  byte temp1 = r.AllocateLocal(kWasmS128);
  byte temp2 = r.AllocateLocal(kWasmS128);
  byte temp3 = r.AllocateLocal(kWasmS128);
  BUILD(r, WASM_LOCAL_SET(temp1, WASM_SIMD_I16x8_SPLAT(WASM_LOCAL_GET(value1))),
        WASM_LOCAL_SET(temp2, WASM_SIMD_I32x4_SPLAT(WASM_LOCAL_GET(value2))),
        WASM_LOCAL_SET(temp3, WASM_SIMD_BINOP(opcode, WASM_LOCAL_GET(temp1),
                                              WASM_LOCAL_GET(temp2))),
        WASM_SIMD_I16x8_EXTRACT_LANE(0, WASM_LOCAL_GET(temp3)));

  CHECK_EQ(expected_op(0xffff, static_cast<uint16_t>(0x7fffffff)),
           r.Call(0xffff, 0x7fffffff));
  CHECK_EQ(expected_op(0xfeff, static_cast<uint16_t>(0x7fffffff)),
           r.Call(0xfeff, 0x7fffffff));
  CHECK_EQ(expected_op(0xffff, static_cast<uint16_t>(0x7ffffeff)),
           r.Call(0xffff, 0x7ffffeff));
}

void RunI32x4UnOpTest(TestExecutionTier execution_tier, WasmOpcode opcode,
                      Int32UnOp expected_op) {
  WasmRunner<int32_t, int32_t> r(execution_tier);
  // Global to hold output.
  int32_t* g = r.builder().AddGlobal<int32_t>(kWasmS128);
  // Build fn to splat test value, perform unop, and write the result.
  byte value = 0;
  byte temp1 = r.AllocateLocal(kWasmS128);
  BUILD(r, WASM_LOCAL_SET(temp1, WASM_SIMD_I32x4_SPLAT(WASM_LOCAL_GET(value))),
        WASM_GLOBAL_SET(0, WASM_SIMD_UNOP(opcode, WASM_LOCAL_GET(temp1))),
        WASM_ONE);

  FOR_INT32_INPUTS(x) {
    r.Call(x);
    int32_t expected = expected_op(x);
    for (int i = 0; i < 4; i++) {
      CHECK_EQ(expected, ReadLittleEndianValue<int32_t>(&g[i]));
    }
  }
}

void RunI32x4BinOpTest(TestExecutionTier execution_tier, WasmOpcode opcode,
                       Int32BinOp expected_op) {
  WasmRunner<int32_t, int32_t, int32_t> r(execution_tier);
  // Global to hold output.
  int32_t* g = r.builder().AddGlobal<int32_t>(kWasmS128);
  // Build fn to splat test values, perform binop, and write the result.
  byte value1 = 0, value2 = 1;
  byte temp1 = r.AllocateLocal(kWasmS128);
  byte temp2 = r.AllocateLocal(kWasmS128);
  BUILD(r, WASM_LOCAL_SET(temp1, WASM_SIMD_I32x4_SPLAT(WASM_LOCAL_GET(value1))),
        WASM_LOCAL_SET(temp2, WASM_SIMD_I32x4_SPLAT(WASM_LOCAL_GET(value2))),
        WASM_GLOBAL_SET(0, WASM_SIMD_BINOP(opcode, WASM_LOCAL_GET(temp1),
                                           WASM_LOCAL_GET(temp2))),
        WASM_ONE);

  FOR_INT32_INPUTS(x) {
    FOR_INT32_INPUTS(y) {
      r.Call(x, y);
      int32_t expected = expected_op(x, y);
      for (int i = 0; i < 4; i++) {
        CHECK_EQ(expected, ReadLittleEndianValue<int32_t>(&g[i]));
      }
    }
  }
}

void RunI32x4ShiftOpTest(TestExecutionTier execution_tier, WasmOpcode opcode,
                         Int32ShiftOp expected_op) {
  // Intentionally shift by 32, should be no-op.
  for (int shift = 1; shift <= 32; shift++) {
    WasmRunner<int32_t, int32_t> r(execution_tier);
    int32_t* memory = r.builder().AddMemoryElems<int32_t>(1);
    int32_t* g_imm = r.builder().AddGlobal<int32_t>(kWasmS128);
    int32_t* g_mem = r.builder().AddGlobal<int32_t>(kWasmS128);
    byte value = 0;
    byte simd = r.AllocateLocal(kWasmS128);
    // Shift using an immediate, and shift using a value loaded from memory.
    BUILD(
        r, WASM_LOCAL_SET(simd, WASM_SIMD_I32x4_SPLAT(WASM_LOCAL_GET(value))),
        WASM_GLOBAL_SET(0, WASM_SIMD_SHIFT_OP(opcode, WASM_LOCAL_GET(simd),
                                              WASM_I32V(shift))),
        WASM_GLOBAL_SET(1, WASM_SIMD_SHIFT_OP(
                               opcode, WASM_LOCAL_GET(simd),
                               WASM_LOAD_MEM(MachineType::Int32(), WASM_ZERO))),
        WASM_ONE);

    r.builder().WriteMemory(&memory[0], shift);
    FOR_INT32_INPUTS(x) {
      r.Call(x);
      int32_t expected = expected_op(x, shift);
      for (int i = 0; i < 4; i++) {
        CHECK_EQ(expected, ReadLittleEndianValue<int32_t>(&g_imm[i]));
        CHECK_EQ(expected, ReadLittleEndianValue<int32_t>(&g_mem[i]));
      }
    }
  }
}

void RunI64x2UnOpTest(TestExecutionTier execution_tier, WasmOpcode opcode,
                      Int64UnOp expected_op) {
  WasmRunner<int32_t, int64_t> r(execution_tier);
  // Global to hold output.
  int64_t* g = r.builder().AddGlobal<int64_t>(kWasmS128);
  // Build fn to splat test value, perform unop, and write the result.
  byte value = 0;
  byte temp1 = r.AllocateLocal(kWasmS128);
  BUILD(r, WASM_LOCAL_SET(temp1, WASM_SIMD_I64x2_SPLAT(WASM_LOCAL_GET(value))),
        WASM_GLOBAL_SET(0, WASM_SIMD_UNOP(opcode, WASM_LOCAL_GET(temp1))),
        WASM_ONE);

  FOR_INT64_INPUTS(x) {
    r.Call(x);
    int64_t expected = expected_op(x);
    for (int i = 0; i < 2; i++) {
      CHECK_EQ(expected, ReadLittleEndianValue<int64_t>(&g[i]));
    }
  }
}

void RunI64x2BinOpTest(TestExecutionTier execution_tier, WasmOpcode opcode,
                       Int64BinOp expected_op) {
  WasmRunner<int32_t, int64_t, int64_t> r(execution_tier);
  // Global to hold output.
  int64_t* g = r.builder().AddGlobal<int64_t>(kWasmS128);
  // Build fn to splat test values, perform binop, and write the result.
  byte value1 = 0, value2 = 1;
  byte temp1 = r.AllocateLocal(kWasmS128);
  byte temp2 = r.AllocateLocal(kWasmS128);
  BUILD(r, WASM_LOCAL_SET(temp1, WASM_SIMD_I64x2_SPLAT(WASM_LOCAL_GET(value1))),
        WASM_LOCAL_SET(temp2, WASM_SIMD_I64x2_SPLAT(WASM_LOCAL_GET(value2))),
        WASM_GLOBAL_SET(0, WASM_SIMD_BINOP(opcode, WASM_LOCAL_GET(temp1),
                                           WASM_LOCAL_GET(temp2))),
        WASM_ONE);

  FOR_INT64_INPUTS(x) {
    FOR_INT64_INPUTS(y) {
      r.Call(x, y);
      int64_t expected = expected_op(x, y);
      for (int i = 0; i < 2; i++) {
        CHECK_EQ(expected, ReadLittleEndianValue<int64_t>(&g[i]));
      }
    }
  }
}

void RunI64x2ShiftOpTest(TestExecutionTier execution_tier, WasmOpcode opcode,
                         Int64ShiftOp expected_op) {
  // Intentionally shift by 64, should be no-op.
  for (int shift = 1; shift <= 64; shift++) {
    WasmRunner<int32_t, int64_t> r(execution_tier);
    int32_t* memory = r.builder().AddMemoryElems<int32_t>(1);
    int64_t* g_imm = r.builder().AddGlobal<int64_t>(kWasmS128);
    int64_t* g_mem = r.builder().AddGlobal<int64_t>(kWasmS128);
    byte value = 0;
    byte simd = r.AllocateLocal(kWasmS128);
    // Shift using an immediate, and shift using a value loaded from memory.
    BUILD(
        r, WASM_LOCAL_SET(simd, WASM_SIMD_I64x2_SPLAT(WASM_LOCAL_GET(value))),
        WASM_GLOBAL_SET(0, WASM_SIMD_SHIFT_OP(opcode, WASM_LOCAL_GET(simd),
                                              WASM_I32V(shift))),
        WASM_GLOBAL_SET(1, WASM_SIMD_SHIFT_OP(
                               opcode, WASM_LOCAL_GET(simd),
                               WASM_LOAD_MEM(MachineType::Int32(), WASM_ZERO))),
        WASM_ONE);

    r.builder().WriteMemory(&memory[0], shift);
    FOR_INT64_INPUTS(x) {
      r.Call(x);
      int64_t expected = expected_op(x, shift);
      for (int i = 0; i < 2; i++) {
        CHECK_EQ(expected, ReadLittleEndianValue<int64_t>(&g_imm[i]));
        CHECK_EQ(expected, ReadLittleEndianValue<int64_t>(&g_mem[i]));
      }
    }
  }
}

bool IsExtreme(float x) {
  float abs_x = std::fabs(x);
  const float kSmallFloatThreshold = 1.0e-32f;
  const float kLargeFloatThreshold = 1.0e32f;
  return abs_x != 0.0f &&  // 0 or -0 are fine.
         (abs_x < kSmallFloatThreshold || abs_x > kLargeFloatThreshold);
}

bool IsSameNan(float expected, float actual) {
  // Sign is non-deterministic.
  uint32_t expected_bits = bit_cast<uint32_t>(expected) & ~0x80000000;
  uint32_t actual_bits = bit_cast<uint32_t>(actual) & ~0x80000000;
  // Some implementations convert signaling NaNs to quiet NaNs.
  return (expected_bits == actual_bits) ||
         ((expected_bits | 0x00400000) == actual_bits);
}

bool IsCanonical(float actual) {
  uint32_t actual_bits = bit_cast<uint32_t>(actual);
  // Canonical NaN has quiet bit and no payload.
  return (actual_bits & 0xFFC00000) == actual_bits;
}

void CheckFloatResult(float x, float y, float expected, float actual,
                      bool exact) {
  if (std::isnan(expected)) {
    CHECK(std::isnan(actual));
    if (std::isnan(x) && IsSameNan(x, actual)) return;
    if (std::isnan(y) && IsSameNan(y, actual)) return;
    if (IsSameNan(expected, actual)) return;
    if (IsCanonical(actual)) return;
    // This is expected to assert; it's useful for debugging.
    CHECK_EQ(bit_cast<uint32_t>(expected), bit_cast<uint32_t>(actual));
  } else {
    if (exact) {
      CHECK_EQ(expected, actual);
      // The sign of 0's must match.
      CHECK_EQ(std::signbit(expected), std::signbit(actual));
      return;
    }
    // Otherwise, perform an approximate equality test. First check for
    // equality to handle +/-Infinity where approximate equality doesn't work.
    if (expected == actual) return;

    // 1% error allows all platforms to pass easily.
    constexpr float kApproximationError = 0.01f;
    float abs_error = std::abs(expected) * kApproximationError,
          min = expected - abs_error, max = expected + abs_error;
    CHECK_LE(min, actual);
    CHECK_GE(max, actual);
  }
}

void RunF32x4UnOpTest(TestExecutionTier execution_tier, WasmOpcode opcode,
                      FloatUnOp expected_op, bool exact) {
  WasmRunner<int32_t, float> r(execution_tier);
  // Global to hold output.
  float* g = r.builder().AddGlobal<float>(kWasmS128);
  // Build fn to splat test value, perform unop, and write the result.
  byte value = 0;
  byte temp1 = r.AllocateLocal(kWasmS128);
  BUILD(r, WASM_LOCAL_SET(temp1, WASM_SIMD_F32x4_SPLAT(WASM_LOCAL_GET(value))),
        WASM_GLOBAL_SET(0, WASM_SIMD_UNOP(opcode, WASM_LOCAL_GET(temp1))),
        WASM_ONE);

  FOR_FLOAT32_INPUTS(x) {
    if (!PlatformCanRepresent(x)) continue;
    // Extreme values have larger errors so skip them for approximation tests.
    if (!exact && IsExtreme(x)) continue;
    float expected = expected_op(x);
#if V8_OS_AIX
    if (!MightReverseSign<FloatUnOp>(expected_op))
      expected = FpOpWorkaround<float>(x, expected);
#endif
    if (!PlatformCanRepresent(expected)) continue;
    r.Call(x);
    for (int i = 0; i < 4; i++) {
      float actual = ReadLittleEndianValue<float>(&g[i]);
      CheckFloatResult(x, x, expected, actual, exact);
    }
  }

  FOR_FLOAT32_NAN_INPUTS(i) {
    float x = bit_cast<float>(nan_test_array[i]);
    if (!PlatformCanRepresent(x)) continue;
    // Extreme values have larger errors so skip them for approximation tests.
    if (!exact && IsExtreme(x)) continue;
    float expected = expected_op(x);
    if (!PlatformCanRepresent(expected)) continue;
    r.Call(x);
    for (int i = 0; i < 4; i++) {
      float actual = ReadLittleEndianValue<float>(&g[i]);
      CheckFloatResult(x, x, expected, actual, exact);
    }
  }
}

void RunF32x4BinOpTest(TestExecutionTier execution_tier, WasmOpcode opcode,
                       FloatBinOp expected_op) {
  WasmRunner<int32_t, float, float> r(execution_tier);
  // Global to hold output.
  float* g = r.builder().AddGlobal<float>(kWasmS128);
  // Build fn to splat test values, perform binop, and write the result.
  byte value1 = 0, value2 = 1;
  byte temp1 = r.AllocateLocal(kWasmS128);
  byte temp2 = r.AllocateLocal(kWasmS128);
  BUILD(r, WASM_LOCAL_SET(temp1, WASM_SIMD_F32x4_SPLAT(WASM_LOCAL_GET(value1))),
        WASM_LOCAL_SET(temp2, WASM_SIMD_F32x4_SPLAT(WASM_LOCAL_GET(value2))),
        WASM_GLOBAL_SET(0, WASM_SIMD_BINOP(opcode, WASM_LOCAL_GET(temp1),
                                           WASM_LOCAL_GET(temp2))),
        WASM_ONE);

  FOR_FLOAT32_INPUTS(x) {
    if (!PlatformCanRepresent(x)) continue;
    FOR_FLOAT32_INPUTS(y) {
      if (!PlatformCanRepresent(y)) continue;
      float expected = expected_op(x, y);
      if (!PlatformCanRepresent(expected)) continue;
      r.Call(x, y);
      for (int i = 0; i < 4; i++) {
        float actual = ReadLittleEndianValue<float>(&g[i]);
        CheckFloatResult(x, y, expected, actual, true /* exact */);
      }
    }
  }

  FOR_FLOAT32_NAN_INPUTS(i) {
    float x = bit_cast<float>(nan_test_array[i]);
    if (!PlatformCanRepresent(x)) continue;
    FOR_FLOAT32_NAN_INPUTS(j) {
      float y = bit_cast<float>(nan_test_array[j]);
      if (!PlatformCanRepresent(y)) continue;
      float expected = expected_op(x, y);
      if (!PlatformCanRepresent(expected)) continue;
      r.Call(x, y);
      for (int i = 0; i < 4; i++) {
        float actual = ReadLittleEndianValue<float>(&g[i]);
        CheckFloatResult(x, y, expected, actual, true /* exact */);
      }
    }
  }
}

void RunF32x4CompareOpTest(TestExecutionTier execution_tier, WasmOpcode opcode,
                           FloatCompareOp expected_op) {
  WasmRunner<int32_t, float, float> r(execution_tier);
  // Set up global to hold mask output.
  int32_t* g = r.builder().AddGlobal<int32_t>(kWasmS128);
  // Build fn to splat test values, perform compare op, and write the result.
  byte value1 = 0, value2 = 1;
  byte temp1 = r.AllocateLocal(kWasmS128);
  byte temp2 = r.AllocateLocal(kWasmS128);
  BUILD(r, WASM_LOCAL_SET(temp1, WASM_SIMD_F32x4_SPLAT(WASM_LOCAL_GET(value1))),
        WASM_LOCAL_SET(temp2, WASM_SIMD_F32x4_SPLAT(WASM_LOCAL_GET(value2))),
        WASM_GLOBAL_SET(0, WASM_SIMD_BINOP(opcode, WASM_LOCAL_GET(temp1),
                                           WASM_LOCAL_GET(temp2))),
        WASM_ONE);

  FOR_FLOAT32_INPUTS(x) {
    if (!PlatformCanRepresent(x)) continue;
    FOR_FLOAT32_INPUTS(y) {
      if (!PlatformCanRepresent(y)) continue;
      float diff = x - y;  // Model comparison as subtraction.
      if (!PlatformCanRepresent(diff)) continue;
      r.Call(x, y);
      int32_t expected = expected_op(x, y);
      for (int i = 0; i < 4; i++) {
        CHECK_EQ(expected, ReadLittleEndianValue<int32_t>(&g[i]));
      }
    }
  }
}

bool IsExtreme(double x) {
  double abs_x = std::fabs(x);
  const double kSmallFloatThreshold = 1.0e-298;
  const double kLargeFloatThreshold = 1.0e298;
  return abs_x != 0.0f &&  // 0 or -0 are fine.
         (abs_x < kSmallFloatThreshold || abs_x > kLargeFloatThreshold);
}

bool IsSameNan(double expected, double actual) {
  // Sign is non-deterministic.
  uint64_t expected_bits = bit_cast<uint64_t>(expected) & ~0x8000000000000000;
  uint64_t actual_bits = bit_cast<uint64_t>(actual) & ~0x8000000000000000;
  // Some implementations convert signaling NaNs to quiet NaNs.
  return (expected_bits == actual_bits) ||
         ((expected_bits | 0x0008000000000000) == actual_bits);
}

bool IsCanonical(double actual) {
  uint64_t actual_bits = bit_cast<uint64_t>(actual);
  // Canonical NaN has quiet bit and no payload.
  return (actual_bits & 0xFFF8000000000000) == actual_bits;
}

void CheckDoubleResult(double x, double y, double expected, double actual,
                       bool exact) {
  if (std::isnan(expected)) {
    CHECK(std::isnan(actual));
    if (std::isnan(x) && IsSameNan(x, actual)) return;
    if (std::isnan(y) && IsSameNan(y, actual)) return;
    if (IsSameNan(expected, actual)) return;
    if (IsCanonical(actual)) return;
    // This is expected to assert; it's useful for debugging.
    CHECK_EQ(bit_cast<uint64_t>(expected), bit_cast<uint64_t>(actual));
  } else {
    if (exact) {
      CHECK_EQ(expected, actual);
      // The sign of 0's must match.
      CHECK_EQ(std::signbit(expected), std::signbit(actual));
      return;
    }
    // Otherwise, perform an approximate equality test. First check for
    // equality to handle +/-Infinity where approximate equality doesn't work.
    if (expected == actual) return;

    // 1% error allows all platforms to pass easily.
    constexpr double kApproximationError = 0.01f;
    double abs_error = std::abs(expected) * kApproximationError,
           min = expected - abs_error, max = expected + abs_error;
    CHECK_LE(min, actual);
    CHECK_GE(max, actual);
  }
}

void RunF64x2UnOpTest(TestExecutionTier execution_tier, WasmOpcode opcode,
                      DoubleUnOp expected_op, bool exact) {
  WasmRunner<int32_t, double> r(execution_tier);
  // Global to hold output.
  double* g = r.builder().AddGlobal<double>(kWasmS128);
  // Build fn to splat test value, perform unop, and write the result.
  byte value = 0;
  byte temp1 = r.AllocateLocal(kWasmS128);
  BUILD(r, WASM_LOCAL_SET(temp1, WASM_SIMD_F64x2_SPLAT(WASM_LOCAL_GET(value))),
        WASM_GLOBAL_SET(0, WASM_SIMD_UNOP(opcode, WASM_LOCAL_GET(temp1))),
        WASM_ONE);

  FOR_FLOAT64_INPUTS(x) {
    if (!PlatformCanRepresent(x)) continue;
    // Extreme values have larger errors so skip them for approximation tests.
    if (!exact && IsExtreme(x)) continue;
    double expected = expected_op(x);
#if V8_OS_AIX
    if (!MightReverseSign<DoubleUnOp>(expected_op))
      expected = FpOpWorkaround<double>(x, expected);
#endif
    if (!PlatformCanRepresent(expected)) continue;
    r.Call(x);
    for (int i = 0; i < 2; i++) {
      double actual = ReadLittleEndianValue<double>(&g[i]);
      CheckDoubleResult(x, x, expected, actual, exact);
    }
  }

  FOR_FLOAT64_NAN_INPUTS(i) {
    double x = bit_cast<double>(double_nan_test_array[i]);
    if (!PlatformCanRepresent(x)) continue;
    // Extreme values have larger errors so skip them for approximation tests.
    if (!exact && IsExtreme(x)) continue;
    double expected = expected_op(x);
    if (!PlatformCanRepresent(expected)) continue;
    r.Call(x);
    for (int i = 0; i < 2; i++) {
      double actual = ReadLittleEndianValue<double>(&g[i]);
      CheckDoubleResult(x, x, expected, actual, exact);
    }
  }
}

void RunF64x2BinOpTest(TestExecutionTier execution_tier, WasmOpcode opcode,
                       DoubleBinOp expected_op) {
  WasmRunner<int32_t, double, double> r(execution_tier);
  // Global to hold output.
  double* g = r.builder().AddGlobal<double>(kWasmS128);
  // Build fn to splat test value, perform binop, and write the result.
  byte value1 = 0, value2 = 1;
  byte temp1 = r.AllocateLocal(kWasmS128);
  byte temp2 = r.AllocateLocal(kWasmS128);
  BUILD(r, WASM_LOCAL_SET(temp1, WASM_SIMD_F64x2_SPLAT(WASM_LOCAL_GET(value1))),
        WASM_LOCAL_SET(temp2, WASM_SIMD_F64x2_SPLAT(WASM_LOCAL_GET(value2))),
        WASM_GLOBAL_SET(0, WASM_SIMD_BINOP(opcode, WASM_LOCAL_GET(temp1),
                                           WASM_LOCAL_GET(temp2))),
        WASM_ONE);

  FOR_FLOAT64_INPUTS(x) {
    if (!PlatformCanRepresent(x)) continue;
    FOR_FLOAT64_INPUTS(y) {
      if (!PlatformCanRepresent(x)) continue;
      double expected = expected_op(x, y);
      if (!PlatformCanRepresent(expected)) continue;
      r.Call(x, y);
      for (int i = 0; i < 2; i++) {
        double actual = ReadLittleEndianValue<double>(&g[i]);
        CheckDoubleResult(x, y, expected, actual, true /* exact */);
      }
    }
  }

  FOR_FLOAT64_NAN_INPUTS(i) {
    double x = bit_cast<double>(double_nan_test_array[i]);
    if (!PlatformCanRepresent(x)) continue;
    FOR_FLOAT64_NAN_INPUTS(j) {
      double y = bit_cast<double>(double_nan_test_array[j]);
      double expected = expected_op(x, y);
      if (!PlatformCanRepresent(expected)) continue;
      r.Call(x, y);
      for (int i = 0; i < 2; i++) {
        double actual = ReadLittleEndianValue<double>(&g[i]);
        CheckDoubleResult(x, y, expected, actual, true /* exact */);
      }
    }
  }
}

void RunF64x2CompareOpTest(TestExecutionTier execution_tier, WasmOpcode opcode,
                           DoubleCompareOp expected_op) {
  WasmRunner<int32_t, double, double> r(execution_tier);
  // Set up global to hold mask output.
  int64_t* g = r.builder().AddGlobal<int64_t>(kWasmS128);
  // Build fn to splat test values, perform compare op, and write the result.
  byte value1 = 0, value2 = 1;
  byte temp1 = r.AllocateLocal(kWasmS128);
  byte temp2 = r.AllocateLocal(kWasmS128);
  // Make the lanes of each temp compare differently:
  // temp1 = y, x and temp2 = y, y.
  BUILD(r, WASM_LOCAL_SET(temp1, WASM_SIMD_F64x2_SPLAT(WASM_LOCAL_GET(value1))),
        WASM_LOCAL_SET(temp1,
                       WASM_SIMD_F64x2_REPLACE_LANE(1, WASM_LOCAL_GET(temp1),
                                                    WASM_LOCAL_GET(value2))),
        WASM_LOCAL_SET(temp2, WASM_SIMD_F64x2_SPLAT(WASM_LOCAL_GET(value2))),
        WASM_GLOBAL_SET(0, WASM_SIMD_BINOP(opcode, WASM_LOCAL_GET(temp1),
                                           WASM_LOCAL_GET(temp2))),
        WASM_ONE);

  FOR_FLOAT64_INPUTS(x) {
    if (!PlatformCanRepresent(x)) continue;
    FOR_FLOAT64_INPUTS(y) {
      if (!PlatformCanRepresent(y)) continue;
      double diff = x - y;  // Model comparison as subtraction.
      if (!PlatformCanRepresent(diff)) continue;
      r.Call(x, y);
      int64_t expected0 = expected_op(x, y);
      int64_t expected1 = expected_op(y, y);
      CHECK_EQ(expected0, ReadLittleEndianValue<int64_t>(&g[0]));
      CHECK_EQ(expected1, ReadLittleEndianValue<int64_t>(&g[1]));
    }
  }
}

}  // namespace wasm
}  // namespace internal
}  // namespace v8
