mirror of https://github.com/rust-lang/rust.git
Auto merge of #123850 - tspiteri:f16_f128_consts, r=Amanieu
Add constants for f16 and f128 - Commit 1 adds associated constants for `f16`, excluding NaN and infinities as these are implemented using arithmetic for `f32` and `f64`. - Commit 2 adds associated constants for `f128`, excluding NaN and infinities. - Commit 3 adds constants in `std::f16::consts`. - Commit 4 adds constants in `std::f128::consts`.
This commit is contained in:
bors
commit
fc47cf38e5
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@ -15,13 +15,204 @@ use crate::mem;
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/// Basic mathematical constants.
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#[unstable(feature = "f128", issue = "116909")]
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pub mod consts {}
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pub mod consts {
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// FIXME: replace with mathematical constants from cmath.
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/// Archimedes' constant (π)
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#[unstable(feature = "f128", issue = "116909")]
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pub const PI: f128 = 3.14159265358979323846264338327950288419716939937510582097494_f128;
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/// The full circle constant (τ)
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///
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/// Equal to 2π.
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#[unstable(feature = "f128", issue = "116909")]
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pub const TAU: f128 = 6.28318530717958647692528676655900576839433879875021164194989_f128;
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/// The golden ratio (φ)
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#[unstable(feature = "f128", issue = "116909")]
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// Also, #[unstable(feature = "more_float_constants", issue = "103883")]
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pub const PHI: f128 = 1.61803398874989484820458683436563811772030917980576286213545_f128;
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/// The Euler-Mascheroni constant (γ)
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#[unstable(feature = "f128", issue = "116909")]
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// Also, #[unstable(feature = "more_float_constants", issue = "103883")]
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pub const EGAMMA: f128 = 0.577215664901532860606512090082402431042159335939923598805767_f128;
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/// π/2
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#[unstable(feature = "f128", issue = "116909")]
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pub const FRAC_PI_2: f128 = 1.57079632679489661923132169163975144209858469968755291048747_f128;
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/// π/3
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#[unstable(feature = "f128", issue = "116909")]
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pub const FRAC_PI_3: f128 = 1.04719755119659774615421446109316762806572313312503527365831_f128;
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/// π/4
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#[unstable(feature = "f128", issue = "116909")]
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pub const FRAC_PI_4: f128 = 0.785398163397448309615660845819875721049292349843776455243736_f128;
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/// π/6
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#[unstable(feature = "f128", issue = "116909")]
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pub const FRAC_PI_6: f128 = 0.523598775598298873077107230546583814032861566562517636829157_f128;
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/// π/8
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#[unstable(feature = "f128", issue = "116909")]
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pub const FRAC_PI_8: f128 = 0.392699081698724154807830422909937860524646174921888227621868_f128;
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/// 1/π
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#[unstable(feature = "f128", issue = "116909")]
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pub const FRAC_1_PI: f128 = 0.318309886183790671537767526745028724068919291480912897495335_f128;
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/// 1/sqrt(π)
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#[unstable(feature = "f128", issue = "116909")]
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// Also, #[unstable(feature = "more_float_constants", issue = "103883")]
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pub const FRAC_1_SQRT_PI: f128 =
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0.564189583547756286948079451560772585844050629328998856844086_f128;
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/// 2/π
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#[unstable(feature = "f128", issue = "116909")]
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pub const FRAC_2_PI: f128 = 0.636619772367581343075535053490057448137838582961825794990669_f128;
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/// 2/sqrt(π)
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#[unstable(feature = "f128", issue = "116909")]
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pub const FRAC_2_SQRT_PI: f128 =
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1.12837916709551257389615890312154517168810125865799771368817_f128;
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/// sqrt(2)
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#[unstable(feature = "f128", issue = "116909")]
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pub const SQRT_2: f128 = 1.41421356237309504880168872420969807856967187537694807317668_f128;
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/// 1/sqrt(2)
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#[unstable(feature = "f128", issue = "116909")]
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pub const FRAC_1_SQRT_2: f128 =
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0.707106781186547524400844362104849039284835937688474036588340_f128;
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/// sqrt(3)
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#[unstable(feature = "f128", issue = "116909")]
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// Also, #[unstable(feature = "more_float_constants", issue = "103883")]
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pub const SQRT_3: f128 = 1.73205080756887729352744634150587236694280525381038062805581_f128;
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/// 1/sqrt(3)
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#[unstable(feature = "f128", issue = "116909")]
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// Also, #[unstable(feature = "more_float_constants", issue = "103883")]
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pub const FRAC_1_SQRT_3: f128 =
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0.577350269189625764509148780501957455647601751270126876018602_f128;
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/// Euler's number (e)
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#[unstable(feature = "f128", issue = "116909")]
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pub const E: f128 = 2.71828182845904523536028747135266249775724709369995957496697_f128;
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/// log<sub>2</sub>(10)
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#[unstable(feature = "f128", issue = "116909")]
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pub const LOG2_10: f128 = 3.32192809488736234787031942948939017586483139302458061205476_f128;
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/// log<sub>2</sub>(e)
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#[unstable(feature = "f128", issue = "116909")]
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pub const LOG2_E: f128 = 1.44269504088896340735992468100189213742664595415298593413545_f128;
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/// log<sub>10</sub>(2)
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#[unstable(feature = "f128", issue = "116909")]
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pub const LOG10_2: f128 = 0.301029995663981195213738894724493026768189881462108541310427_f128;
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/// log<sub>10</sub>(e)
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#[unstable(feature = "f128", issue = "116909")]
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pub const LOG10_E: f128 = 0.434294481903251827651128918916605082294397005803666566114454_f128;
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/// ln(2)
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#[unstable(feature = "f128", issue = "116909")]
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pub const LN_2: f128 = 0.693147180559945309417232121458176568075500134360255254120680_f128;
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/// ln(10)
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#[unstable(feature = "f128", issue = "116909")]
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pub const LN_10: f128 = 2.30258509299404568401799145468436420760110148862877297603333_f128;
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}
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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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@ -15,13 +15,200 @@ use crate::mem;
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/// Basic mathematical constants.
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#[unstable(feature = "f16", issue = "116909")]
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pub mod consts {}
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pub mod consts {
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// FIXME: replace with mathematical constants from cmath.
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/// Archimedes' constant (π)
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#[unstable(feature = "f16", issue = "116909")]
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pub const PI: f16 = 3.14159265358979323846264338327950288_f16;
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/// The full circle constant (τ)
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///
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/// Equal to 2π.
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#[unstable(feature = "f16", issue = "116909")]
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pub const TAU: f16 = 6.28318530717958647692528676655900577_f16;
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/// The golden ratio (φ)
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#[unstable(feature = "f16", issue = "116909")]
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// Also, #[unstable(feature = "more_float_constants", issue = "103883")]
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pub const PHI: f16 = 1.618033988749894848204586834365638118_f16;
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/// The Euler-Mascheroni constant (γ)
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#[unstable(feature = "f16", issue = "116909")]
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// Also, #[unstable(feature = "more_float_constants", issue = "103883")]
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pub const EGAMMA: f16 = 0.577215664901532860606512090082402431_f16;
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/// π/2
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#[unstable(feature = "f16", issue = "116909")]
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pub const FRAC_PI_2: f16 = 1.57079632679489661923132169163975144_f16;
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/// π/3
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#[unstable(feature = "f16", issue = "116909")]
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pub const FRAC_PI_3: f16 = 1.04719755119659774615421446109316763_f16;
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/// π/4
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#[unstable(feature = "f16", issue = "116909")]
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pub const FRAC_PI_4: f16 = 0.785398163397448309615660845819875721_f16;
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/// π/6
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#[unstable(feature = "f16", issue = "116909")]
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pub const FRAC_PI_6: f16 = 0.52359877559829887307710723054658381_f16;
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/// π/8
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#[unstable(feature = "f16", issue = "116909")]
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pub const FRAC_PI_8: f16 = 0.39269908169872415480783042290993786_f16;
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/// 1/π
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#[unstable(feature = "f16", issue = "116909")]
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pub const FRAC_1_PI: f16 = 0.318309886183790671537767526745028724_f16;
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/// 1/sqrt(π)
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#[unstable(feature = "f16", issue = "116909")]
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// Also, #[unstable(feature = "more_float_constants", issue = "103883")]
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pub const FRAC_1_SQRT_PI: f16 = 0.564189583547756286948079451560772586_f16;
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/// 2/π
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#[unstable(feature = "f16", issue = "116909")]
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pub const FRAC_2_PI: f16 = 0.636619772367581343075535053490057448_f16;
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/// 2/sqrt(π)
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#[unstable(feature = "f16", issue = "116909")]
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pub const FRAC_2_SQRT_PI: f16 = 1.12837916709551257389615890312154517_f16;
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/// sqrt(2)
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#[unstable(feature = "f16", issue = "116909")]
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pub const SQRT_2: f16 = 1.41421356237309504880168872420969808_f16;
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/// 1/sqrt(2)
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#[unstable(feature = "f16", issue = "116909")]
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pub const FRAC_1_SQRT_2: f16 = 0.707106781186547524400844362104849039_f16;
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/// sqrt(3)
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#[unstable(feature = "f16", issue = "116909")]
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// Also, #[unstable(feature = "more_float_constants", issue = "103883")]
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pub const SQRT_3: f16 = 1.732050807568877293527446341505872367_f16;
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/// 1/sqrt(3)
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#[unstable(feature = "f16", issue = "116909")]
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// Also, #[unstable(feature = "more_float_constants", issue = "103883")]
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pub const FRAC_1_SQRT_3: f16 = 0.577350269189625764509148780501957456_f16;
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/// Euler's number (e)
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#[unstable(feature = "f16", issue = "116909")]
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pub const E: f16 = 2.71828182845904523536028747135266250_f16;
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/// log<sub>2</sub>(10)
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#[unstable(feature = "f16", issue = "116909")]
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pub const LOG2_10: f16 = 3.32192809488736234787031942948939018_f16;
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/// log<sub>2</sub>(e)
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#[unstable(feature = "f16", issue = "116909")]
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pub const LOG2_E: f16 = 1.44269504088896340735992468100189214_f16;
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/// log<sub>10</sub>(2)
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#[unstable(feature = "f16", issue = "116909")]
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pub const LOG10_2: f16 = 0.301029995663981195213738894724493027_f16;
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/// log<sub>10</sub>(e)
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#[unstable(feature = "f16", issue = "116909")]
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pub const LOG10_E: f16 = 0.434294481903251827651128918916605082_f16;
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/// ln(2)
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#[unstable(feature = "f16", issue = "116909")]
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pub const LN_2: f16 = 0.693147180559945309417232121458176568_f16;
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/// ln(10)
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#[unstable(feature = "f16", issue = "116909")]
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pub const LN_10: f16 = 2.30258509299404568401799145468436421_f16;
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}
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#[cfg(not(test))]
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impl f16 {
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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 `f16`.
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#[unstable(feature = "f16", 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 = "f16", issue = "116909")]
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pub const MANTISSA_DIGITS: u32 = 11;
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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 `f16` 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`]: f16::MANTISSA_DIGITS
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#[unstable(feature = "f16", issue = "116909")]
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pub const DIGITS: u32 = 3;
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/// [Machine epsilon] value for `f16`.
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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`]: f16::MANTISSA_DIGITS
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#[unstable(feature = "f16", issue = "116909")]
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pub const EPSILON: f16 = 9.7656e-4_f16;
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/// Smallest finite `f16` value.
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///
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/// Equal to −[`MAX`].
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///
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/// [`MAX`]: f16::MAX
|
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#[unstable(feature = "f16", issue = "116909")]
|
||||
pub const MIN: f16 = -6.5504e+4_f16;
|
||||
/// Smallest positive normal `f16` value.
|
||||
///
|
||||
/// Equal to 2<sup>[`MIN_EXP`] − 1</sup>.
|
||||
///
|
||||
/// [`MIN_EXP`]: f16::MIN_EXP
|
||||
#[unstable(feature = "f16", issue = "116909")]
|
||||
pub const MIN_POSITIVE: f16 = 6.1035e-5_f16;
|
||||
/// Largest finite `f16` value.
|
||||
///
|
||||
/// Equal to
|
||||
/// (1 − 2<sup>−[`MANTISSA_DIGITS`]</sup>) 2<sup>[`MAX_EXP`]</sup>.
|
||||
///
|
||||
/// [`MANTISSA_DIGITS`]: f16::MANTISSA_DIGITS
|
||||
/// [`MAX_EXP`]: f16::MAX_EXP
|
||||
#[unstable(feature = "f16", issue = "116909")]
|
||||
pub const MAX: f16 = 6.5504e+4_f16;
|
||||
|
||||
/// One greater than the minimum possible normal power of 2 exponent.
|
||||
///
|
||||
/// If <i>x</i> = `MIN_EXP`, then normal numbers
|
||||
/// ≥ 0.5 × 2<sup><i>x</i></sup>.
|
||||
#[unstable(feature = "f16", issue = "116909")]
|
||||
pub const MIN_EXP: i32 = -13;
|
||||
/// Maximum possible power of 2 exponent.
|
||||
///
|
||||
/// If <i>x</i> = `MAX_EXP`, then normal numbers
|
||||
/// < 1 × 2<sup><i>x</i></sup>.
|
||||
#[unstable(feature = "f16", issue = "116909")]
|
||||
pub const MAX_EXP: i32 = 16;
|
||||
|
||||
/// Minimum <i>x</i> for which 10<sup><i>x</i></sup> is normal.
|
||||
///
|
||||
/// Equal to ceil(log<sub>10</sub> [`MIN_POSITIVE`]).
|
||||
///
|
||||
/// [`MIN_POSITIVE`]: f16::MIN_POSITIVE
|
||||
#[unstable(feature = "f16", issue = "116909")]
|
||||
pub const MIN_10_EXP: i32 = -4;
|
||||
/// Maximum <i>x</i> for which 10<sup><i>x</i></sup> is normal.
|
||||
///
|
||||
/// Equal to floor(log<sub>10</sub> [`MAX`]).
|
||||
///
|
||||
/// [`MAX`]: f16::MAX
|
||||
#[unstable(feature = "f16", issue = "116909")]
|
||||
pub const MAX_10_EXP: i32 = 4;
|
||||
|
||||
/// Returns `true` if this value is NaN.
|
||||
#[inline]
|
||||
#[must_use]
|
||||
|
|
|
|||
|
|
@ -6,6 +6,10 @@ LL | const M: usize = (f64::from(N) * std::f64::LOG10_2) as usize;
|
|||
|
|
||||
help: consider importing one of these items
|
||||
|
|
||||
LL + use std::f128::consts::LOG10_2;
|
||||
|
|
||||
LL + use std::f16::consts::LOG10_2;
|
||||
|
|
||||
LL + use std::f32::consts::LOG10_2;
|
||||
|
|
||||
LL + use std::f64::consts::LOG10_2;
|
||||
|
|
|
|||
|
|
@ -107,6 +107,10 @@ LL | (E::TupleWithFields(/* fields */)).foo();
|
|||
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
help: consider importing one of these items instead
|
||||
|
|
||||
LL + use std::f128::consts::E;
|
||||
|
|
||||
LL + use std::f16::consts::E;
|
||||
|
|
||||
LL + use std::f32::consts::E;
|
||||
|
|
||||
LL + use std::f64::consts::E;
|
||||
|
|
|
|||
|
|
@ -84,6 +84,10 @@ LL | let _: E = m::f;
|
|||
| ~
|
||||
help: consider importing one of these items instead
|
||||
|
|
||||
LL + use std::f128::consts::E;
|
||||
|
|
||||
LL + use std::f16::consts::E;
|
||||
|
|
||||
LL + use std::f32::consts::E;
|
||||
|
|
||||
LL + use std::f64::consts::E;
|
||||
|
|
@ -121,6 +125,10 @@ LL | let _: E = (E::Fn(/* fields */));
|
|||
| ~~~~~~~~~~~~~~~~~~~~~
|
||||
help: consider importing one of these items instead
|
||||
|
|
||||
LL + use std::f128::consts::E;
|
||||
|
|
||||
LL + use std::f16::consts::E;
|
||||
|
|
||||
LL + use std::f32::consts::E;
|
||||
|
|
||||
LL + use std::f64::consts::E;
|
||||
|
|
|
|||
Loading…
Reference in New Issue