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Add f16, f128#333

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usamoi wants to merge3 commits intorust-num:master
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add f16
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@usamoi
usamoi committedMay 31, 2025
commiteac01b9712a0a50648b4bf5728ed1f4d8ae27537
4 changes: 4 additions & 0 deletionsbuild.rs
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Original file line numberDiff line numberDiff line change
Expand Up@@ -4,4 +4,8 @@ fn main() {
ac.emit_expression_cfg("1f64.total_cmp(&2f64)", "has_total_cmp"); // 1.62

autocfg::rerun_path("build.rs");

// FIXME: use autocfg to emit it
println!("cargo:rustc-cfg=has_f16");
println!("cargo:rustc-check-cfg=cfg(has_f16)");
}
6 changes: 5 additions & 1 deletionsrc/bounds.rs
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Original file line numberDiff line numberDiff line change
@@ -1,3 +1,5 @@
#[cfg(has_f16)]
use core::f16;
use core::num::Wrapping;
use core::{f32, f64};
use core::{i128, i16, i32, i64, i8, isize};
Expand DownExpand Up@@ -77,7 +79,10 @@ impl<T: Bounded> Bounded for Wrapping<T> {
}
}

#[cfg(has_f16)]
bounded_impl!(f16, f16::MIN, f16::MAX);
bounded_impl!(f32, f32::MIN, f32::MAX);
bounded_impl!(f64, f64::MIN, f64::MAX);

macro_rules! for_each_tuple_ {
( $m:ident !! ) => (
Expand DownExpand Up@@ -110,7 +115,6 @@ macro_rules! bounded_tuple {
}

for_each_tuple!(bounded_tuple);
bounded_impl!(f64, f64::MIN, f64::MAX);

#[test]
fn wrapping_bounded() {
Expand Down
87 changes: 68 additions & 19 deletionssrc/cast.rs
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Original file line numberDiff line numberDiff line change
@@ -1,3 +1,5 @@
#[cfg(has_f16)]
use core::f16;
use core::mem::size_of;
use core::num::Wrapping;
use core::{f32, f64};
Expand DownExpand Up@@ -101,6 +103,15 @@ pub trait ToPrimitive {
self.to_u64().map(From::from)
}

/// Converts the value of `self` to an `f16`. Overflows may map to positive
/// or negative inifinity, otherwise `None` is returned if the value cannot
/// be represented by an `f16`.
#[cfg(has_f16)]
#[inline]
fn to_f16(&self) -> Option<f16> {
self.to_f64().as_ref().and_then(ToPrimitive::to_f16)
}

/// Converts the value of `self` to an `f32`. Overflows may map to positive
/// or negative inifinity, otherwise `None` is returned if the value cannot
/// be represented by an `f32`.
Expand DownExpand Up@@ -177,6 +188,11 @@ macro_rules! impl_to_primitive_int {
fn to_u128 -> u128;
}

#[cfg(has_f16)]
#[inline]
fn to_f16(&self) -> Option<f16> {
Some(*self as f16)
}
#[inline]
fn to_f32(&self) -> Option<f32> {
Some(*self as f32)
Expand DownExpand Up@@ -247,6 +263,11 @@ macro_rules! impl_to_primitive_uint {
fn to_u128 -> u128;
}

#[cfg(has_f16)]
#[inline]
fn to_f16(&self) -> Option<f16> {
Some(*self as f16)
}
#[inline]
fn to_f32(&self) -> Option<f32> {
Some(*self as f32)
Expand All@@ -267,8 +288,9 @@ impl_to_primitive_uint!(u64);
impl_to_primitive_uint!(u128);

macro_rules! impl_to_primitive_float_to_float {
($SrcT:ident : $( fn $method:ident -> $DstT:ident ; )*) => {$(
($SrcT:ident : $($(#[$cfg:meta])*fn $method:ident -> $DstT:ident ; )*) => {$(
#[inline]
$(#[$cfg])*
fn $method(&self) -> Option<$DstT> {
// We can safely cast all values, whether NaN, +-inf, or finite.
// Finite values that are reducing size may saturate to +-inf.
Expand DownExpand Up@@ -364,13 +386,17 @@ macro_rules! impl_to_primitive_float {
}

impl_to_primitive_float_to_float! { $T:
#[cfg(has_f16)]
fn to_f16 -> f16;
fn to_f32 -> f32;
fn to_f64 -> f64;
}
}
};
}

#[cfg(has_f16)]
impl_to_primitive_float!(f16);
impl_to_primitive_float!(f32);
impl_to_primitive_float!(f64);

Expand DownExpand Up@@ -469,6 +495,14 @@ pub trait FromPrimitive: Sized {
n.to_u64().and_then(FromPrimitive::from_u64)
}

/// Converts a `f16` to return an optional value of this type. If the
/// value cannot be represented by this type, then `None` is returned.
#[cfg(has_f16)]
#[inline]
fn from_f16(n: f16) -> Option<Self> {
FromPrimitive::from_f64(n as f64)
}

/// Converts a `f32` to return an optional value of this type. If the
/// value cannot be represented by this type, then `None` is returned.
#[inline]
Expand DownExpand Up@@ -545,6 +579,11 @@ macro_rules! impl_from_primitive {
n.$to_ty()
}

#[cfg(has_f16)]
#[inline]
fn from_f16(n: f16) -> Option<$T> {
n.$to_ty()
}
#[inline]
fn from_f32(n: f32) -> Option<$T> {
n.$to_ty()
Expand All@@ -569,6 +608,8 @@ impl_from_primitive!(u16, to_u16);
impl_from_primitive!(u32, to_u32);
impl_from_primitive!(u64, to_u64);
impl_from_primitive!(u128, to_u128);
#[cfg(has_f16)]
impl_from_primitive!(f16, to_f16);
impl_from_primitive!(f32, to_f32);
impl_from_primitive!(f64, to_f64);

Expand DownExpand Up@@ -598,6 +639,8 @@ impl<T: ToPrimitive> ToPrimitive for Wrapping<T> {
fn to_u64 -> u64;
fn to_u128 -> u128;

#[cfg(has_f16)]
fn to_f16 -> f16;
fn to_f32 -> f32;
fn to_f64 -> f64;
}
Expand DownExpand Up@@ -629,6 +672,8 @@ impl<T: FromPrimitive> FromPrimitive for Wrapping<T> {
fn from_u64(u64);
fn from_u128(u128);

#[cfg(has_f16)]
fn from_f16(f16);
fn from_f32(f32);
fn from_f64(f64);
}
Expand DownExpand Up@@ -692,6 +737,8 @@ impl_num_cast!(i32, to_i32);
impl_num_cast!(i64, to_i64);
impl_num_cast!(i128, to_i128);
impl_num_cast!(isize, to_isize);
#[cfg(has_f16)]
impl_num_cast!(f16, to_f16);
impl_num_cast!(f32, to_f32);
impl_num_cast!(f64, to_f64);

Expand DownExpand Up@@ -742,29 +789,31 @@ macro_rules! impl_as_primitive {
#[inline] fn as_(self) -> $U { self as $U }
}
};
(@ $T: ty => { $( $U: ty ),* } ) => {$(
impl_as_primitive!(@ $T => impl $U);
(@ $T: ty => { $( $(#[$cfg:meta])* $U: ty ),* } ) => {$(
impl_as_primitive!(@ $T =>$(#[$cfg])*impl $U);
)*};
($T: ty => { $( $U: ty ),* } ) => {
impl_as_primitive!(@ $T => { $( $U ),* });
($T: ty => { $( $(#[$cfg:meta])* $U: ty ),* } ) => {
impl_as_primitive!(@ $T => { $( $(#[$cfg])* $U ),* });
impl_as_primitive!(@ $T => { u8, u16, u32, u64, u128, usize });
impl_as_primitive!(@ $T => { i8, i16, i32, i64, i128, isize });
};
}

impl_as_primitive!(u8 => { char, f32, f64 });
impl_as_primitive!(i8 => { f32, f64 });
impl_as_primitive!(u16 => { f32, f64 });
impl_as_primitive!(i16 => { f32, f64 });
impl_as_primitive!(u32 => { f32, f64 });
impl_as_primitive!(i32 => { f32, f64 });
impl_as_primitive!(u64 => { f32, f64 });
impl_as_primitive!(i64 => { f32, f64 });
impl_as_primitive!(u128 => { f32, f64 });
impl_as_primitive!(i128 => { f32, f64 });
impl_as_primitive!(usize => { f32, f64 });
impl_as_primitive!(isize => { f32, f64 });
impl_as_primitive!(f32 => { f32, f64 });
impl_as_primitive!(f64 => { f32, f64 });
impl_as_primitive!(u8 => { char, #[cfg(has_f16)] f16, f32, f64 });
impl_as_primitive!(i8 => { #[cfg(has_f16)] f16, f32, f64 });
impl_as_primitive!(u16 => { #[cfg(has_f16)] f16, f32, f64 });
impl_as_primitive!(i16 => { #[cfg(has_f16)] f16, f32, f64 });
impl_as_primitive!(u32 => { #[cfg(has_f16)] f16, f32, f64 });
impl_as_primitive!(i32 => { #[cfg(has_f16)] f16, f32, f64 });
impl_as_primitive!(u64 => { #[cfg(has_f16)] f16, f32, f64 });
impl_as_primitive!(i64 => { #[cfg(has_f16)] f16, f32, f64 });
impl_as_primitive!(u128 => { #[cfg(has_f16)] f16, f32, f64 });
impl_as_primitive!(i128 => { #[cfg(has_f16)] f16, f32, f64 });
impl_as_primitive!(usize => { #[cfg(has_f16)] f16, f32, f64 });
impl_as_primitive!(isize => { #[cfg(has_f16)] f16, f32, f64 });
#[cfg(has_f16)]
impl_as_primitive!(f16 => { f16, f32, f64 });
impl_as_primitive!(f32 => { #[cfg(has_f16)] f16, f32, f64 });
impl_as_primitive!(f64 => { #[cfg(has_f16)] f16, f32, f64 });
impl_as_primitive!(char => { char });
impl_as_primitive!(bool => {});
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