mirror of
https://github.com/fmtlib/fmt.git
synced 2026-04-29 10:13:37 +02:00
Add 128-bit operations to bigint
This commit is contained in:
Victor Zverovich
+59
-51
@@ -24,9 +24,9 @@ static_assert(!std::is_copy_constructible<bigint>::value, "");
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static_assert(!std::is_copy_assignable<bigint>::value, "");
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TEST(bigint_test, construct) {
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EXPECT_EQ("", fmt::format("{}", bigint()));
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EXPECT_EQ("42", fmt::format("{}", bigint(0x42)));
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EXPECT_EQ("123456789abcedf0", fmt::format("{}", bigint(0x123456789abcedf0)));
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EXPECT_EQ(fmt::to_string(bigint()), "");
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EXPECT_EQ(fmt::to_string(bigint(0x42)), "42");
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EXPECT_EQ(fmt::to_string(bigint(0x123456789abcedf0)), "123456789abcedf0");
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}
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TEST(bigint_test, compare) {
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@@ -72,46 +72,56 @@ TEST(bigint_test, add_compare) {
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TEST(bigint_test, shift_left) {
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bigint n(0x42);
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n <<= 0;
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EXPECT_EQ("42", fmt::format("{}", n));
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EXPECT_EQ(fmt::to_string(n), "42");
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n <<= 1;
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EXPECT_EQ("84", fmt::format("{}", n));
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EXPECT_EQ(fmt::to_string(n), "84");
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n <<= 25;
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EXPECT_EQ("108000000", fmt::format("{}", n));
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EXPECT_EQ(fmt::to_string(n), "108000000");
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}
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TEST(bigint_test, multiply) {
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bigint n(0x42);
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EXPECT_THROW(n *= 0, assertion_failure);
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n *= 1;
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EXPECT_EQ("42", fmt::format("{}", n));
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EXPECT_EQ(fmt::to_string(n), "42");
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n *= 2;
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EXPECT_EQ("84", fmt::format("{}", n));
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EXPECT_EQ(fmt::to_string(n), "84");
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n *= 0x12345678;
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EXPECT_EQ("962fc95e0", fmt::format("{}", n));
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EXPECT_EQ(fmt::to_string(n), "962fc95e0");
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bigint bigmax(max_value<uint32_t>());
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bigmax *= max_value<uint32_t>();
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EXPECT_EQ("fffffffe00000001", fmt::format("{}", bigmax));
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bigmax.assign(max_value<uint64_t>());
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bigmax *= max_value<uint64_t>();
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EXPECT_EQ("fffffffffffffffe0000000000000001", fmt::format("{}", bigmax));
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EXPECT_EQ(fmt::to_string(bigmax), "fffffffe00000001");
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const auto max64 = max_value<uint64_t>();
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bigmax = max64;
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bigmax *= max64;
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EXPECT_EQ(fmt::to_string(bigmax), "fffffffffffffffe0000000000000001");
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const auto max128 = (fmt::detail::uint128_t(max64) << 64) | max64;
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bigmax = max128;
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// bigmax *= max128;
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// EXPECT_EQ(fmt::to_string(bigmax),
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// "fffffffffffffffffffffffffffffffe00000000000000000000000000000001");
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}
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TEST(bigint_test, square) {
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bigint n0(0);
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n0.square();
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EXPECT_EQ("0", fmt::format("{}", n0));
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EXPECT_EQ(fmt::to_string(n0), "0");
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bigint n1(0x100);
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n1.square();
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EXPECT_EQ("10000", fmt::format("{}", n1));
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EXPECT_EQ(fmt::to_string(n1), "10000");
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bigint n2(0xfffffffff);
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n2.square();
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EXPECT_EQ("ffffffffe000000001", fmt::format("{}", n2));
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EXPECT_EQ(fmt::to_string(n2), "ffffffffe000000001");
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bigint n3(max_value<uint64_t>());
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n3.square();
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EXPECT_EQ("fffffffffffffffe0000000000000001", fmt::format("{}", n3));
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EXPECT_EQ(fmt::to_string(n3), "fffffffffffffffe0000000000000001");
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bigint n4;
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n4.assign_pow10(10);
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EXPECT_EQ("2540be400", fmt::format("{}", n4));
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EXPECT_EQ(fmt::to_string(n4), "2540be400");
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}
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TEST(bigint_test, divmod_assign_zero_divisor) {
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@@ -133,8 +143,8 @@ TEST(bigint_test, divmod_assign_unaligned) {
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n2.assign_pow10(100);
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int result = n1.divmod_assign(n2);
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EXPECT_EQ(result, 9406);
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EXPECT_EQ("10f8353019583bfc29ffc8f564e1b9f9d819dbb4cf783e4507eca1539220p96",
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fmt::format("{}", n1));
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EXPECT_EQ(fmt::to_string(n1),
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"10f8353019583bfc29ffc8f564e1b9f9d819dbb4cf783e4507eca1539220p96");
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}
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TEST(bigint_test, divmod_assign) {
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@@ -142,19 +152,19 @@ TEST(bigint_test, divmod_assign) {
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bigint n1(100);
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int result = n1.divmod_assign(bigint(10));
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EXPECT_EQ(result, 10);
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EXPECT_EQ("0", fmt::format("{}", n1));
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EXPECT_EQ(fmt::to_string(n1), "0");
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// pow(10, 100) / (42 << 320):
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n1.assign_pow10(100);
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result = n1.divmod_assign(bigint(42) <<= 320);
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EXPECT_EQ(result, 111);
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EXPECT_EQ("13ad2594c37ceb0b2784c4ce0bf38ace408e211a7caab24308a82e8f10p96",
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fmt::format("{}", n1));
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EXPECT_EQ(fmt::to_string(n1),
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"13ad2594c37ceb0b2784c4ce0bf38ace408e211a7caab24308a82e8f10p96");
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// 42 / 100:
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bigint n2(42);
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n1.assign_pow10(2);
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result = n2.divmod_assign(n1);
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EXPECT_EQ(result, 0);
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EXPECT_EQ("2a", fmt::format("{}", n2));
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EXPECT_EQ(fmt::to_string(n2), "2a");
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}
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template <bool is_iec559> void run_double_tests() {
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@@ -173,8 +183,8 @@ TEST(fp_test, double_tests) {
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TEST(fp_test, normalize) {
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const auto v = fp(0xbeef, 42);
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auto normalized = normalize(v);
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EXPECT_EQ(0xbeef000000000000, normalized.f);
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EXPECT_EQ(-6, normalized.e);
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EXPECT_EQ(normalized.f, 0xbeef000000000000);
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EXPECT_EQ(normalized.e, -6);
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}
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TEST(fp_test, multiply) {
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@@ -200,8 +210,8 @@ TEST(fp_test, get_cached_power) {
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cache <<= power.e;
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exact.align(cache);
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cache.align(exact);
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auto exact_str = fmt::format("{}", exact);
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auto cache_str = fmt::format("{}", cache);
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auto exact_str = fmt::to_string(exact);
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auto cache_str = fmt::to_string(cache);
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EXPECT_EQ(exact_str.size(), cache_str.size());
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EXPECT_EQ(exact_str.substr(0, 15), cache_str.substr(0, 15));
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int diff = cache_str[15] - exact_str[15];
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@@ -212,11 +222,11 @@ TEST(fp_test, get_cached_power) {
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} else {
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cache.assign_pow10(-dec_exp);
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cache *= power.f + 1; // Inexact check.
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exact.assign(1);
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exact = 1;
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exact <<= -power.e;
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exact.align(cache);
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auto exact_str = fmt::format("{}", exact);
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auto cache_str = fmt::format("{}", cache);
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auto exact_str = fmt::to_string(exact);
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auto cache_str = fmt::to_string(cache);
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EXPECT_EQ(exact_str.size(), cache_str.size());
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EXPECT_EQ(exact_str.substr(0, 16), cache_str.substr(0, 16));
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}
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@@ -242,25 +252,25 @@ TEST(fp_test, dragonbox_max_k) {
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TEST(fp_test, get_round_direction) {
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using fmt::detail::get_round_direction;
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using fmt::detail::round_direction;
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EXPECT_EQ(round_direction::down, get_round_direction(100, 50, 0));
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EXPECT_EQ(round_direction::up, get_round_direction(100, 51, 0));
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EXPECT_EQ(round_direction::down, get_round_direction(100, 40, 10));
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EXPECT_EQ(round_direction::up, get_round_direction(100, 60, 10));
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EXPECT_EQ(get_round_direction(100, 50, 0), round_direction::down);
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EXPECT_EQ(get_round_direction(100, 51, 0), round_direction::up);
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EXPECT_EQ(get_round_direction(100, 40, 10), round_direction::down);
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EXPECT_EQ(get_round_direction(100, 60, 10), round_direction::up);
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for (size_t i = 41; i < 60; ++i)
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EXPECT_EQ(round_direction::unknown, get_round_direction(100, i, 10));
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EXPECT_EQ(get_round_direction(100, i, 10), round_direction::unknown);
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uint64_t max = max_value<uint64_t>();
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EXPECT_THROW(get_round_direction(100, 100, 0), assertion_failure);
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EXPECT_THROW(get_round_direction(100, 0, 100), assertion_failure);
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EXPECT_THROW(get_round_direction(100, 0, 50), assertion_failure);
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// Check that remainder + error doesn't overflow.
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EXPECT_EQ(round_direction::up, get_round_direction(max, max - 1, 2));
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EXPECT_EQ(get_round_direction(max, max - 1, 2), round_direction::up);
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// Check that 2 * (remainder + error) doesn't overflow.
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EXPECT_EQ(round_direction::unknown,
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get_round_direction(max, max / 2 + 1, max / 2));
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EXPECT_EQ(get_round_direction(max, max / 2 + 1, max / 2),
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round_direction::unknown);
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// Check that remainder - error doesn't overflow.
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EXPECT_EQ(round_direction::unknown, get_round_direction(100, 40, 41));
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EXPECT_EQ(get_round_direction(100, 40, 41), round_direction::unknown);
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// Check that 2 * (remainder - error) doesn't overflow.
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EXPECT_EQ(round_direction::up, get_round_direction(max, max - 1, 1));
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EXPECT_EQ(get_round_direction(max, max - 1, 1), round_direction::up);
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}
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TEST(fp_test, fixed_handler) {
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@@ -283,20 +293,20 @@ TEST(fp_test, fixed_handler) {
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}
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TEST(fp_test, grisu_format_compiles_with_on_ieee_double) {
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fmt::memory_buffer buf;
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auto buf = fmt::memory_buffer();
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format_float(0.42, -1, fmt::detail::float_specs(), buf);
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}
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TEST(format_impl_test, format_error_code) {
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std::string msg = "error 42", sep = ": ";
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{
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fmt::memory_buffer buffer;
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auto buffer = fmt::memory_buffer();
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format_to(fmt::appender(buffer), "garbage");
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fmt::detail::format_error_code(buffer, 42, "test");
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EXPECT_EQ("test: " + msg, to_string(buffer));
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EXPECT_EQ(to_string(buffer), "test: " + msg);
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}
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{
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fmt::memory_buffer buffer;
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auto buffer = fmt::memory_buffer();
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auto prefix =
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std::string(fmt::inline_buffer_size - msg.size() - sep.size() + 1, 'x');
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fmt::detail::format_error_code(buffer, 42, prefix);
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@@ -317,7 +327,7 @@ TEST(format_impl_test, format_error_code) {
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// Test with a message that doesn't fit into the buffer.
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prefix += 'x';
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fmt::detail::format_error_code(buffer, codes[i], prefix);
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EXPECT_EQ(msg, to_string(buffer));
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EXPECT_EQ(to_string(buffer), msg);
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}
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}
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@@ -333,8 +343,8 @@ template <typename Int> void test_count_digits() {
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for (Int i = 0; i < 10; ++i) EXPECT_EQ(1u, fmt::detail::count_digits(i));
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for (Int i = 1, n = 1, end = max_value<Int>() / 10; n <= end; ++i) {
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n *= 10;
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EXPECT_EQ(i, fmt::detail::count_digits(n - 1));
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EXPECT_EQ(i + 1, fmt::detail::count_digits(n));
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EXPECT_EQ(fmt::detail::count_digits(n - 1), i);
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EXPECT_EQ(fmt::detail::count_digits(n), i + 1);
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}
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}
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@@ -345,11 +355,9 @@ TEST(format_impl_test, count_digits) {
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#ifdef _WIN32
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# include <windows.h>
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#endif
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#ifdef _WIN32
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TEST(format_impl_test, write_console_signature) {
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decltype(WriteConsoleW)* p = fmt::detail::WriteConsoleW;
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decltype(::WriteConsoleW)* p = fmt::detail::WriteConsoleW;
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(void)p;
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}
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#endif
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