-
Notifications
You must be signed in to change notification settings - Fork 214
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Eliminate the use of
public_test_dep!
Replace `public_test_dep!` by placing optionally public items into new modules, then controlling what is exported with the `public-test-deps` feature. This is nicer for automatic formatting and diagnostics.
- Loading branch information
Showing
8 changed files
with
752 additions
and
759 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,184 @@ | ||
| use core::ops; | ||
|
|
||
| use crate::int::{DInt, Int, MinInt}; | ||
|
|
||
| /// Wrapper to extract the integer type half of the float's size | ||
| pub type HalfRep<F> = <<F as Float>::Int as DInt>::H; | ||
|
|
||
| /// Trait for some basic operations on floats | ||
| #[allow(dead_code)] | ||
| pub trait Float: | ||
| Copy | ||
| + core::fmt::Debug | ||
| + PartialEq | ||
| + PartialOrd | ||
| + ops::AddAssign | ||
| + ops::MulAssign | ||
| + ops::Add<Output = Self> | ||
| + ops::Sub<Output = Self> | ||
| + ops::Div<Output = Self> | ||
| + ops::Rem<Output = Self> | ||
| { | ||
| /// A uint of the same width as the float | ||
| type Int: Int; | ||
|
|
||
| /// A int of the same width as the float | ||
| type SignedInt: Int; | ||
|
|
||
| /// An int capable of containing the exponent bits plus a sign bit. This is signed. | ||
| type ExpInt: Int; | ||
|
|
||
| const ZERO: Self; | ||
| const ONE: Self; | ||
|
|
||
| /// The bitwidth of the float type | ||
| const BITS: u32; | ||
|
|
||
| /// The bitwidth of the significand | ||
| const SIGNIFICAND_BITS: u32; | ||
|
|
||
| /// The bitwidth of the exponent | ||
| const EXPONENT_BITS: u32 = Self::BITS - Self::SIGNIFICAND_BITS - 1; | ||
|
|
||
| /// The maximum value of the exponent | ||
| const EXPONENT_MAX: u32 = (1 << Self::EXPONENT_BITS) - 1; | ||
|
|
||
| /// The exponent bias value | ||
| const EXPONENT_BIAS: u32 = Self::EXPONENT_MAX >> 1; | ||
|
|
||
| /// A mask for the sign bit | ||
| const SIGN_MASK: Self::Int; | ||
|
|
||
| /// A mask for the significand | ||
| const SIGNIFICAND_MASK: Self::Int; | ||
|
|
||
| /// The implicit bit of the float format | ||
| const IMPLICIT_BIT: Self::Int; | ||
|
|
||
| /// A mask for the exponent | ||
| const EXPONENT_MASK: Self::Int; | ||
|
|
||
| /// Returns `self` transmuted to `Self::Int` | ||
| fn repr(self) -> Self::Int; | ||
|
|
||
| /// Returns `self` transmuted to `Self::SignedInt` | ||
| fn signed_repr(self) -> Self::SignedInt; | ||
|
|
||
| /// Checks if two floats have the same bit representation. *Except* for NaNs! NaN can be | ||
| /// represented in multiple different ways. This method returns `true` if two NaNs are | ||
| /// compared. | ||
| fn eq_repr(self, rhs: Self) -> bool; | ||
|
|
||
| /// Returns true if the sign is negative | ||
| fn is_sign_negative(self) -> bool; | ||
|
|
||
| /// Returns the exponent with bias | ||
| fn exp(self) -> Self::ExpInt; | ||
|
|
||
| /// Returns the significand with no implicit bit (or the "fractional" part) | ||
| fn frac(self) -> Self::Int; | ||
|
|
||
| /// Returns the significand with implicit bit | ||
| fn imp_frac(self) -> Self::Int; | ||
|
|
||
| /// Returns a `Self::Int` transmuted back to `Self` | ||
| fn from_repr(a: Self::Int) -> Self; | ||
|
|
||
| /// Constructs a `Self` from its parts. Inputs are treated as bits and shifted into position. | ||
| fn from_parts(sign: bool, exponent: Self::Int, significand: Self::Int) -> Self; | ||
|
|
||
| /// Returns (normalized exponent, normalized significand) | ||
| fn normalize(significand: Self::Int) -> (i32, Self::Int); | ||
|
|
||
| /// Returns if `self` is subnormal | ||
| fn is_subnormal(self) -> bool; | ||
| } | ||
|
|
||
| macro_rules! float_impl { | ||
| ($ty:ident, $ity:ident, $sity:ident, $expty:ident, $bits:expr, $significand_bits:expr) => { | ||
| impl Float for $ty { | ||
| type Int = $ity; | ||
| type SignedInt = $sity; | ||
| type ExpInt = $expty; | ||
|
|
||
| const ZERO: Self = 0.0; | ||
| const ONE: Self = 1.0; | ||
|
|
||
| const BITS: u32 = $bits; | ||
| const SIGNIFICAND_BITS: u32 = $significand_bits; | ||
|
|
||
| const SIGN_MASK: Self::Int = 1 << (Self::BITS - 1); | ||
| const SIGNIFICAND_MASK: Self::Int = (1 << Self::SIGNIFICAND_BITS) - 1; | ||
| const IMPLICIT_BIT: Self::Int = 1 << Self::SIGNIFICAND_BITS; | ||
| const EXPONENT_MASK: Self::Int = !(Self::SIGN_MASK | Self::SIGNIFICAND_MASK); | ||
|
|
||
| fn repr(self) -> Self::Int { | ||
| self.to_bits() | ||
| } | ||
| fn signed_repr(self) -> Self::SignedInt { | ||
| self.to_bits() as Self::SignedInt | ||
| } | ||
| fn eq_repr(self, rhs: Self) -> bool { | ||
| #[cfg(feature = "mangled-names")] | ||
| fn is_nan(x: $ty) -> bool { | ||
| // When using mangled-names, the "real" compiler-builtins might not have the | ||
| // necessary builtin (__unordtf2) to test whether `f128` is NaN. | ||
| // FIXME(f16_f128): Remove once the nightly toolchain has the __unordtf2 builtin | ||
| // x is NaN if all the bits of the exponent are set and the significand is non-0 | ||
| x.repr() & $ty::EXPONENT_MASK == $ty::EXPONENT_MASK | ||
| && x.repr() & $ty::SIGNIFICAND_MASK != 0 | ||
| } | ||
| #[cfg(not(feature = "mangled-names"))] | ||
| fn is_nan(x: $ty) -> bool { | ||
| x.is_nan() | ||
| } | ||
| if is_nan(self) && is_nan(rhs) { | ||
| true | ||
| } else { | ||
| self.repr() == rhs.repr() | ||
| } | ||
| } | ||
| fn is_sign_negative(self) -> bool { | ||
| self.is_sign_negative() | ||
| } | ||
| fn exp(self) -> Self::ExpInt { | ||
| ((self.to_bits() & Self::EXPONENT_MASK) >> Self::SIGNIFICAND_BITS) as Self::ExpInt | ||
| } | ||
| fn frac(self) -> Self::Int { | ||
| self.to_bits() & Self::SIGNIFICAND_MASK | ||
| } | ||
| fn imp_frac(self) -> Self::Int { | ||
| self.frac() | Self::IMPLICIT_BIT | ||
| } | ||
| fn from_repr(a: Self::Int) -> Self { | ||
| Self::from_bits(a) | ||
| } | ||
| fn from_parts(sign: bool, exponent: Self::Int, significand: Self::Int) -> Self { | ||
| Self::from_repr( | ||
| ((sign as Self::Int) << (Self::BITS - 1)) | ||
| | ((exponent << Self::SIGNIFICAND_BITS) & Self::EXPONENT_MASK) | ||
| | (significand & Self::SIGNIFICAND_MASK), | ||
| ) | ||
| } | ||
| fn normalize(significand: Self::Int) -> (i32, Self::Int) { | ||
| let shift = significand | ||
| .leading_zeros() | ||
| .wrapping_sub((Self::Int::ONE << Self::SIGNIFICAND_BITS).leading_zeros()); | ||
| ( | ||
| 1i32.wrapping_sub(shift as i32), | ||
| significand << shift as Self::Int, | ||
| ) | ||
| } | ||
| fn is_subnormal(self) -> bool { | ||
| (self.repr() & Self::EXPONENT_MASK) == Self::Int::ZERO | ||
| } | ||
| } | ||
| }; | ||
| } | ||
|
|
||
| #[cfg(not(feature = "no-f16-f128"))] | ||
| float_impl!(f16, u16, i16, i8, 16, 10); | ||
| float_impl!(f32, u32, i32, i16, 32, 23); | ||
| float_impl!(f64, u64, i64, i16, 64, 52); | ||
| #[cfg(not(feature = "no-f16-f128"))] | ||
| float_impl!(f128, u128, i128, i16, 128, 112); |
Oops, something went wrong.