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Simplify Dragonbox implementation

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This commit is contained in:
Junekey Jeon 2022-07-12 16:26:05 -07:00 committed by Victor Zverovich
parent d82e1a108d
commit 8061d9afbe
2 changed files with 4 additions and 21 deletions
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23
include/fmt/format-inl.h
View File

@ -1346,26 +1346,11 @@ template <typename T> decimal_fp<T> to_decimal(T x) noexcept {
goto small_divisor_case_label;
} else {
// r == deltai; compare fractional parts.
const carrier_uint two_fl = two_fc - 1;
const typename cache_accessor<T>::compute_mul_parity_result x_mul =
cache_accessor<T>::compute_mul_parity(two_fc - 1, cache, beta);
if (!include_left_endpoint ||
exponent < float_info<T>::case_fc_pm_half_lower_threshold ||
exponent > float_info<T>::divisibility_check_by_5_threshold) {
// If the left endpoint is not included, the condition for
// success is z^(f) < delta^(f) (odd parity).
// Otherwise, the inequalities on exponent ensure that
// x is not an integer, so if z^(f) >= delta^(f) (even parity), we in fact
// have strict inequality.
if (!cache_accessor<T>::compute_mul_parity(two_fl, cache, beta).parity) {
goto small_divisor_case_label;
}
} else {
const typename cache_accessor<T>::compute_mul_parity_result x_mul =
cache_accessor<T>::compute_mul_parity(two_fl, cache, beta);
if (!x_mul.parity && !x_mul.is_integer) {
goto small_divisor_case_label;
}
}
if (!(x_mul.parity | (x_mul.is_integer & include_left_endpoint)))
goto small_divisor_case_label;
}
ret_value.exponent = minus_k + float_info<T>::kappa + 1;

2
include/fmt/format.h
View File

@ -1276,8 +1276,6 @@ template <> struct float_info<float> {
static const int small_divisor = 10;
static const int min_k = -31;
static const int max_k = 46;
static const int divisibility_check_by_5_threshold = 39;
static const int case_fc_pm_half_lower_threshold = -1;
static const int shorter_interval_tie_lower_threshold = -35;
static const int shorter_interval_tie_upper_threshold = -35;
};