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Cleanup FP formatting

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This commit is contained in:
Victor Zverovich
2025-06-01 09:15:17 -07:00
parent cc88914904
commit 46be88bc1e
1 changed files with 6 additions and 5 deletions
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11
include/fmt/format.h
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@ -730,6 +730,9 @@ struct is_fast_float : bool_constant<std::numeric_limits<T>::is_iec559 &&
sizeof(T) <= sizeof(double)> {};
template <typename T> struct is_fast_float<T, false> : std::false_type {};
template <typename T>
using fast_float_t = conditional_t<sizeof(T) == sizeof(double), double, float>;
template <typename T>
using is_double_double = bool_constant<std::numeric_limits<T>::digits == 106>;
@ -3355,8 +3358,7 @@ FMT_CONSTEXPR20 auto write(OutputIt out, T value, format_specs specs,
precision = 6;
} else if (is_fast_float<T>::value && !is_constant_evaluated()) {
// Use Dragonbox for the shortest format.
using floaty = conditional_t<sizeof(T) >= sizeof(double), double, float>;
auto dec = dragonbox::to_decimal(static_cast<floaty>(value));
auto dec = dragonbox::to_decimal(static_cast<fast_float_t<T>>(value));
return write_float<Char>(out, dec, specs, s, exp_upper, loc);
}
}
@ -3394,12 +3396,11 @@ FMT_CONSTEXPR20 auto write(OutputIt out, T value) -> OutputIt {
if (is_constant_evaluated()) return write<Char>(out, value, format_specs());
auto s = detail::signbit(value) ? sign::minus : sign::none;
using float_type = conditional_t<sizeof(T) == sizeof(double), double, float>;
auto mask = exponent_mask<float_type>();
auto mask = exponent_mask<fast_float_t<T>>();
if ((bit_cast<decltype(mask)>(value) & mask) == mask)
return write_nonfinite<Char>(out, std::isnan(value), {}, s);
auto dec = dragonbox::to_decimal<float_type>(value);
auto dec = dragonbox::to_decimal(static_cast<fast_float_t<T>>(value));
int significand_size = count_digits(dec.significand);
int exp = dec.exponent + significand_size - 1;
if (use_fixed(exp, detail::exp_upper<T>())) {