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Add integer_decode to FloatCore

This commit is contained in:
Josh Stone 2018-02-27 16:32:48 -08:00
parent f365a4205f
commit 83d498d0be
1 changed files with 15 additions and 2 deletions
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17
src/float.rs
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@ -230,6 +230,11 @@ pub trait FloatCore: Num + NumCast + Neg<Output = Self> + PartialOrd + Copy {
/// Converts to radians, assuming the number is in degrees. /// Converts to radians, assuming the number is in degrees.
fn to_radians(self) -> Self; fn to_radians(self) -> Self;
/// Returns the mantissa, base 2 exponent, and sign as integers, respectively.
/// The original number can be recovered by `sign * mantissa * 2 ^ exponent`.
/// The floating point encoding is documented in the [Reference][floating-point].
fn integer_decode(self) -> (u64, i16, i8);
} }
impl FloatCore for f32 { impl FloatCore for f32 {
@ -273,6 +278,11 @@ impl FloatCore for f32 {
::core::f32::MAX ::core::f32::MAX
} }
#[inline]
fn integer_decode(self) -> (u64, i16, i8) {
integer_decode_f32(self)
}
#[inline] #[inline]
#[cfg(not(feature = "std"))] #[cfg(not(feature = "std"))]
fn classify(self) -> FpCategory { fn classify(self) -> FpCategory {
@ -367,6 +377,11 @@ impl FloatCore for f64 {
::core::f64::MAX ::core::f64::MAX
} }
#[inline]
fn integer_decode(self) -> (u64, i16, i8) {
integer_decode_f64(self)
}
#[inline] #[inline]
#[cfg(not(feature = "std"))] #[cfg(not(feature = "std"))]
fn classify(self) -> FpCategory { fn classify(self) -> FpCategory {
@ -1448,7 +1463,6 @@ macro_rules! float_impl {
) )
} }
#[cfg(feature = "std")]
fn integer_decode_f32(f: f32) -> (u64, i16, i8) { fn integer_decode_f32(f: f32) -> (u64, i16, i8) {
let bits: u32 = unsafe { mem::transmute(f) }; let bits: u32 = unsafe { mem::transmute(f) };
let sign: i8 = if bits >> 31 == 0 { let sign: i8 = if bits >> 31 == 0 {
@ -1467,7 +1481,6 @@ fn integer_decode_f32(f: f32) -> (u64, i16, i8) {
(mantissa as u64, exponent, sign) (mantissa as u64, exponent, sign)
} }
#[cfg(feature = "std")]
fn integer_decode_f64(f: f64) -> (u64, i16, i8) { fn integer_decode_f64(f: f64) -> (u64, i16, i8) {
let bits: u64 = unsafe { mem::transmute(f) }; let bits: u64 = unsafe { mem::transmute(f) };
let sign: i8 = if bits >> 63 == 0 { let sign: i8 = if bits >> 63 == 0 {