add f128 associated constants
NaN and infinity are not included as they require arithmetic.
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@ -19,9 +19,91 @@ pub mod consts {}
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#[cfg(not(test))]
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impl f128 {
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// FIXME(f16_f128): almost everything in this `impl` is missing examples and a const
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// FIXME(f16_f128): almost all methods in this `impl` are missing examples and a const
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// implementation. Add these once we can run code on all platforms and have f16/f128 in CTFE.
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/// The radix or base of the internal representation of `f128`.
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#[unstable(feature = "f128", issue = "116909")]
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pub const RADIX: u32 = 2;
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/// Number of significant digits in base 2.
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#[unstable(feature = "f128", issue = "116909")]
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pub const MANTISSA_DIGITS: u32 = 113;
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/// Approximate number of significant digits in base 10.
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///
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/// This is the maximum <i>x</i> such that any decimal number with <i>x</i>
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/// significant digits can be converted to `f128` and back without loss.
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///
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/// Equal to floor(log<sub>10</sub> 2<sup>[`MANTISSA_DIGITS`] − 1</sup>).
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///
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/// [`MANTISSA_DIGITS`]: f128::MANTISSA_DIGITS
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#[unstable(feature = "f128", issue = "116909")]
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pub const DIGITS: u32 = 33;
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/// [Machine epsilon] value for `f128`.
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///
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/// This is the difference between `1.0` and the next larger representable number.
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///
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/// Equal to 2<sup>1 − [`MANTISSA_DIGITS`]</sup>.
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///
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/// [Machine epsilon]: https://en.wikipedia.org/wiki/Machine_epsilon
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/// [`MANTISSA_DIGITS`]: f128::MANTISSA_DIGITS
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#[unstable(feature = "f128", issue = "116909")]
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pub const EPSILON: f128 = 1.92592994438723585305597794258492731e-34_f128;
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/// Smallest finite `f128` value.
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///
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/// Equal to −[`MAX`].
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///
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/// [`MAX`]: f128::MAX
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#[unstable(feature = "f128", issue = "116909")]
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pub const MIN: f128 = -1.18973149535723176508575932662800701e+4932_f128;
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/// Smallest positive normal `f128` value.
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///
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/// Equal to 2<sup>[`MIN_EXP`] − 1</sup>.
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///
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/// [`MIN_EXP`]: f128::MIN_EXP
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#[unstable(feature = "f128", issue = "116909")]
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pub const MIN_POSITIVE: f128 = 3.36210314311209350626267781732175260e-4932_f128;
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/// Largest finite `f128` value.
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///
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/// Equal to
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/// (1 − 2<sup>−[`MANTISSA_DIGITS`]</sup>) 2<sup>[`MAX_EXP`]</sup>.
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///
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/// [`MANTISSA_DIGITS`]: f128::MANTISSA_DIGITS
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/// [`MAX_EXP`]: f128::MAX_EXP
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#[unstable(feature = "f128", issue = "116909")]
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pub const MAX: f128 = 1.18973149535723176508575932662800701e+4932_f128;
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/// One greater than the minimum possible normal power of 2 exponent.
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///
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/// If <i>x</i> = `MIN_EXP`, then normal numbers
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/// ≥ 0.5 × 2<sup><i>x</i></sup>.
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#[unstable(feature = "f128", issue = "116909")]
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pub const MIN_EXP: i32 = -16_381;
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/// Maximum possible power of 2 exponent.
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///
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/// If <i>x</i> = `MAX_EXP`, then normal numbers
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/// < 1 × 2<sup><i>x</i></sup>.
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#[unstable(feature = "f128", issue = "116909")]
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pub const MAX_EXP: i32 = 16_384;
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/// Minimum <i>x</i> for which 10<sup><i>x</i></sup> is normal.
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///
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/// Equal to ceil(log<sub>10</sub> [`MIN_POSITIVE`]).
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///
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/// [`MIN_POSITIVE`]: f128::MIN_POSITIVE
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#[unstable(feature = "f128", issue = "116909")]
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pub const MIN_10_EXP: i32 = -4_931;
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/// Maximum <i>x</i> for which 10<sup><i>x</i></sup> is normal.
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///
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/// Equal to floor(log<sub>10</sub> [`MAX`]).
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///
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/// [`MAX`]: f128::MAX
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#[unstable(feature = "f128", issue = "116909")]
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pub const MAX_10_EXP: i32 = 4_932;
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/// Returns `true` if this value is NaN.
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#[inline]
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#[must_use]
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