Function TEST

be/src/runtime/multi-precision-test.cc:33–77

namespace impala {

TEST(MultiPrecisionIntTest, Conversion) {
  int128_t x = 0;
  int256_t y = 0;
  EXPECT_TRUE(ConvertToInt256(x) == 0);

  x = -1;
  EXPECT_TRUE(ConvertToInt256(x) == -1);

  x = 1;
  EXPECT_TRUE(ConvertToInt256(x) == 1);

  x = numeric_limits<int32_t>::max();
  EXPECT_TRUE(ConvertToInt256(x) == numeric_limits<int32_t>::max());

  x = numeric_limits<int32_t>::min();
  EXPECT_TRUE(ConvertToInt256(x) == numeric_limits<int32_t>::min());

  x = numeric_limits<int64_t>::max();
  EXPECT_TRUE(ConvertToInt256(x) == numeric_limits<int64_t>::max());

  x = numeric_limits<int64_t>::min();
  EXPECT_TRUE(ConvertToInt256(x) == numeric_limits<int64_t>::min());

  x = numeric_limits<int64_t>::max();
  x *= 1000;
  y = numeric_limits<int64_t>::max();
  y *= 1000;
  EXPECT_TRUE(ConvertToInt256(x) == y);

  x = -numeric_limits<int64_t>::max();
  x *= 1000;
  y = -numeric_limits<int64_t>::max();
  y *= 1000;
  EXPECT_TRUE(ConvertToInt256(x) == y);

  // Note: numer_limits<> doesn't work for int128_t.
  static int128_t MAX_VALUE;
  memset(&MAX_VALUE, 255, sizeof(MAX_VALUE));
  uint8_t* buf = reinterpret_cast<uint8_t*>(&MAX_VALUE);
  buf[15] = 127;

  bool overflow = false;
  EXPECT_TRUE(ConvertToInt128(ConvertToInt256(x), MAX_VALUE, &overflow) == x);
  EXPECT_FALSE(overflow);
}

TEST(MultiPrecisionIntTest, HighLowBits) {
  // x = 0x0f0e0d0c0b0a09080706050403020100