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Add initial support for 128-bit floats

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This commit is contained in:
Victor Zverovich 2022-03-14 14:00:15 -07:00
parent 72f487562d
commit f2543b0a98
2 changed files with 5 additions and 7 deletions
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6
include/fmt/format-inl.h
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@ -233,17 +233,15 @@ template <typename F> struct basic_fp {
template <typename Float>
using is_supported = bool_constant<std::numeric_limits<Float>::is_iec559 &&
std::numeric_limits<Float>::digits <= 64>;
std::numeric_limits<Float>::digits <= 113>;
// Assigns d to this and return true iff predecessor is closer than successor.
template <typename Float, FMT_ENABLE_IF(is_supported<Float>::value)>
FMT_CONSTEXPR bool assign(Float n) {
// Assume float is in the format [sign][exponent][significand].
const int num_float_significand_bits =
detail::num_significand_bits<Float>();
using carrier_uint = typename dragonbox::float_info<Float>::carrier_uint;
const carrier_uint implicit_bit = carrier_uint(1)
<< num_float_significand_bits;
<< detail::num_significand_bits<Float>();
const carrier_uint significand_mask = implicit_bit - 1;
auto u = bit_cast<carrier_uint>(n);
f = static_cast<uint64_t>(u & significand_mask);

6
include/fmt/format.h
View File

@ -1252,10 +1252,10 @@ template <> struct float_info<double> {
static const int shorter_interval_tie_upper_threshold = -77;
};
// 80-bit extended precision long double.
// An 80- or 128-bit floating point number.
template <typename T>
struct float_info<T, enable_if_t<std::is_same<T, long double>::value &&
std::numeric_limits<T>::digits == 64>> {
struct float_info<T, enable_if_t<std::numeric_limits<T>::digits == 64 ||
std::numeric_limits<T>::digits == 113>> {
using carrier_uint = detail::uint128_t;
static const int exponent_bits = 15;
};