diff options
Diffstat (limited to 'absl/numeric/int128_test.cc')
| -rw-r--r-- | absl/numeric/int128_test.cc | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/absl/numeric/int128_test.cc b/absl/numeric/int128_test.cc index dd9425d7..01e3eb5c 100644 --- a/absl/numeric/int128_test.cc +++ b/absl/numeric/int128_test.cc @@ -32,6 +32,8 @@ #pragma warning(disable:4146) #endif +#define MAKE_INT128(HI, LO) absl::MakeInt128(static_cast<int64_t>(HI), LO) + namespace { template <typename T> @@ -283,8 +285,9 @@ TEST(Uint128, ConversionTests) { EXPECT_EQ(from_precise_double, from_precise_ints); EXPECT_DOUBLE_EQ(static_cast<double>(from_precise_ints), precise_double); - double approx_double = 0xffffeeeeddddcccc * std::pow(2.0, 64.0) + - 0xbbbbaaaa99998888; + double approx_double = + static_cast<double>(0xffffeeeeddddcccc) * std::pow(2.0, 64.0) + + static_cast<double>(0xbbbbaaaa99998888); absl::uint128 from_approx_double(approx_double); EXPECT_DOUBLE_EQ(static_cast<double>(from_approx_double), approx_double); @@ -1245,6 +1248,27 @@ TEST(Int128, BitwiseShiftTest) { absl::MakeInt128(uint64_t{1} << j, 0) >>= (j - i)); } } + + // Manually calculated cases with shift count for positive (val1) and negative + // (val2) values + absl::int128 val1 = MAKE_INT128(0x123456789abcdef0, 0x123456789abcdef0); + absl::int128 val2 = MAKE_INT128(0xfedcba0987654321, 0xfedcba0987654321); + + EXPECT_EQ(val1 << 63, MAKE_INT128(0x91a2b3c4d5e6f78, 0x0)); + EXPECT_EQ(val1 << 64, MAKE_INT128(0x123456789abcdef0, 0x0)); + EXPECT_EQ(val2 << 63, MAKE_INT128(0xff6e5d04c3b2a190, 0x8000000000000000)); + EXPECT_EQ(val2 << 64, MAKE_INT128(0xfedcba0987654321, 0x0)); + + EXPECT_EQ(val1 << 126, MAKE_INT128(0x0, 0x0)); + EXPECT_EQ(val2 << 126, MAKE_INT128(0x4000000000000000, 0x0)); + + EXPECT_EQ(val1 >> 63, MAKE_INT128(0x0, 0x2468acf13579bde0)); + EXPECT_EQ(val1 >> 64, MAKE_INT128(0x0, 0x123456789abcdef0)); + EXPECT_EQ(val2 >> 63, MAKE_INT128(0xffffffffffffffff, 0xfdb974130eca8643)); + EXPECT_EQ(val2 >> 64, MAKE_INT128(0xffffffffffffffff, 0xfedcba0987654321)); + + EXPECT_EQ(val1 >> 126, MAKE_INT128(0x0, 0x0)); + EXPECT_EQ(val2 >> 126, MAKE_INT128(0xffffffffffffffff, 0xffffffffffffffff)); } TEST(Int128, NumericLimitsTest) { |