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Workaround broken std::numeric_limits

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This commit is contained in:
Victor Zverovich
2022-03-20 07:51:46 -07:00
parent 8271e43e5e
commit db745986f2
2 changed files with 27 additions and 32 deletions
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14
include/fmt/format.h
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@@ -1308,6 +1308,11 @@ constexpr auto exponent_mask() ->
return ((uint(1) << dragonbox::float_info<Float>::exponent_bits) - 1)
<< num_significand_bits<Float>();
}
template <typename Float> constexpr auto exponent_bias() -> int {
// std::numeric_limits may not support __float128.
return is_float128<Float>() ? 16383
: std::numeric_limits<Float>::max_exponent - 1;
}
// Writes the exponent exp in the form "[+-]d{2,3}" to buffer.
template <typename Char, typename It>
@@ -2370,13 +2375,8 @@ template <typename Char, typename OutputIt, typename T,
FMT_CONSTEXPR20 auto write(OutputIt out, T value) -> OutputIt {
if (is_constant_evaluated())
return write(out, value, basic_format_specs<Char>());
if (const_check(!is_supported_floating_point(value))) return out;
using floaty = conditional_t<std::is_same<T, long double>::value, double, T>;
using uint = typename dragonbox::float_info<floaty>::carrier_uint;
auto bits = bit_cast<uint>(value);
auto fspecs = float_specs();
if (detail::signbit(value)) {
fspecs.sign = sign::minus;
@@ -2384,8 +2384,10 @@ FMT_CONSTEXPR20 auto write(OutputIt out, T value) -> OutputIt {
}
constexpr auto specs = basic_format_specs<Char>();
using floaty = conditional_t<std::is_same<T, long double>::value, double, T>;
using uint = typename dragonbox::float_info<floaty>::carrier_uint;
uint mask = exponent_mask<floaty>();
if ((bits & mask) == mask)
if ((bit_cast<uint>(value) & mask) == mask)
return write_nonfinite(out, std::isnan(value), specs, fspecs);
auto dec = dragonbox::to_decimal(static_cast<floaty>(value));