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Use dragon in constexpr

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This commit is contained in:
Victor Zverovich
2023-05-22 17:06:37 -07:00
parent a54cb108d4
commit 858e528abd
4 changed files with 9 additions and 238 deletions
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test/format-impl-test.cc
-43
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@@ -249,49 +249,6 @@ TEST(fp_test, dragonbox_max_k) {
2 * fmt::detail::num_significand_bits<double>() - 1));
}
TEST(fp_test, get_round_direction) {
using fmt::detail::get_round_direction;
using fmt::detail::round_direction;
EXPECT_EQ(get_round_direction(100, 50, 0), round_direction::down);
EXPECT_EQ(get_round_direction(100, 51, 0), round_direction::up);
EXPECT_EQ(get_round_direction(100, 40, 10), round_direction::down);
EXPECT_EQ(get_round_direction(100, 60, 10), round_direction::up);
for (size_t i = 41; i < 60; ++i)
EXPECT_EQ(get_round_direction(100, i, 10), round_direction::unknown);
uint64_t max = max_value<uint64_t>();
EXPECT_THROW(get_round_direction(100, 100, 0), assertion_failure);
EXPECT_THROW(get_round_direction(100, 0, 100), assertion_failure);
EXPECT_THROW(get_round_direction(100, 0, 50), assertion_failure);
// Check that remainder + error doesn't overflow.
EXPECT_EQ(get_round_direction(max, max - 1, 2), round_direction::up);
// Check that 2 * (remainder + error) doesn't overflow.
EXPECT_EQ(get_round_direction(max, max / 2 + 1, max / 2),
round_direction::unknown);
// Check that remainder - error doesn't overflow.
EXPECT_EQ(get_round_direction(100, 40, 41), round_direction::unknown);
// Check that 2 * (remainder - error) doesn't overflow.
EXPECT_EQ(get_round_direction(max, max - 1, 1), round_direction::up);
}
TEST(fp_test, fixed_handler) {
struct handler : fmt::detail::gen_digits_handler {
char buffer[10];
handler(int prec = 0) : fmt::detail::gen_digits_handler() {
buf = buffer;
precision = prec;
}
};
handler().on_digit('0', 100, 99, 0, false);
EXPECT_THROW(handler().on_digit('0', 100, 100, 0, false), assertion_failure);
namespace digits = fmt::detail::digits;
EXPECT_EQ(handler(1).on_digit('0', 100, 10, 10, false), digits::error);
// Check that divisor - error doesn't overflow.
EXPECT_EQ(handler(1).on_digit('0', 100, 10, 101, false), digits::error);
// Check that 2 * error doesn't overflow.
uint64_t max = max_value<uint64_t>();
EXPECT_EQ(handler(1).on_digit('0', max, 10, max - 1, false), digits::error);
}
TEST(fp_test, grisu_format_compiles_with_on_ieee_double) {
auto buf = fmt::memory_buffer();
format_float(0.42, -1, fmt::detail::float_specs(), buf);