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// Copyright © 2018–2024 Trevor Spiteri
// This library is free software: you can redistribute it and/or modify it under
// the terms of either
//
// * the Apache License, Version 2.0 or
// * the MIT License
//
// at your option.
//
// You should have recieved copies of the Apache License and the MIT License
// along with the library. If not, see
// <https://www.apache.org/licenses/LICENSE-2.0> and
// <https://opensource.org/licenses/MIT>.
#![allow(deprecated)]
use crate::{
float_helper,
helpers::{FloatKind, FromFloatHelper, Private},
int_helper::IntFixed,
traits::{Fixed, FixedEquiv, FromFixed, ToFixed},
types::extra::U0,
F128Bits, FixedI128, FixedI16, FixedI32, FixedI64, FixedI8, FixedU128, FixedU16, FixedU32,
FixedU64, FixedU8, F128,
};
use bytemuck::TransparentWrapper;
use half::{bf16, f16};
impl ToFixed for bool {
/// Converts a [`bool`] to a fixed-point number.
///
/// # Panics
///
/// When debug assertions are enabled, panics if the value does
/// not fit. When debug assertions are not enabled, the wrapped
/// value can be returned, but it is not considered a breaking
/// change if in the future it panics; if wrapping is required use
/// [`wrapping_to_fixed`] instead.
///
/// [`wrapping_to_fixed`]: ToFixed::wrapping_to_fixed
#[inline]
#[track_caller]
fn to_fixed<F: Fixed>(self) -> F {
ToFixed::to_fixed(u8::from(self))
}
/// Converts a [`bool`] to a fixed-point number if it fits, otherwise returns [`None`].
#[inline]
fn checked_to_fixed<F: Fixed>(self) -> Option<F> {
ToFixed::checked_to_fixed(u8::from(self))
}
/// Convert a [`bool`] to a fixed-point number, saturating if it does not fit.
#[inline]
fn saturating_to_fixed<F: Fixed>(self) -> F {
ToFixed::saturating_to_fixed(u8::from(self))
}
/// Converts a [`bool`] to a fixed-point number, wrapping if it does not fit.
#[inline]
fn wrapping_to_fixed<F: Fixed>(self) -> F {
ToFixed::wrapping_to_fixed(u8::from(self))
}
/// Converts a [`bool`] to a fixed-point number.
///
/// Returns a [tuple] of the fixed-point number and a [`bool`]
/// indicating whether an overflow has occurred. On overflow, the
/// wrapped value is returned.
#[inline]
fn overflowing_to_fixed<F: Fixed>(self) -> (F, bool) {
ToFixed::overflowing_to_fixed(u8::from(self))
}
/// Converts a [`bool`] to a fixed-point number, panicking if it
/// does not fit.
///
/// # Panics
///
/// Panics if the value does not fit, even when debug assertions
/// are not enabled.
#[inline]
#[track_caller]
fn unwrapped_to_fixed<F: Fixed>(self) -> F {
ToFixed::unwrapped_to_fixed(u8::from(self))
}
}
macro_rules! impl_int {
($Int:ident $(, $Equiv:ident)?) => {
impl FromFixed for $Int {
/// Converts a fixed-point number to an integer.
///
/// Any fractional bits are discarded, which rounds towards −∞.
///
/// # Panics
///
/// When debug assertions are enabled, panics if the value
/// does not fit. When debug assertions are not enabled,
/// the wrapped value can be returned, but it is not
/// considered a breaking change if in the future it
/// panics; if wrapping is required use
/// [`wrapping_from_fixed`] instead.
///
/// [`wrapping_from_fixed`]: FromFixed::wrapping_from_fixed
#[inline]
#[track_caller]
fn from_fixed<F: Fixed>(src: F) -> Self {
IntFixed::<$Int>::int(FromFixed::from_fixed(src))
}
/// Converts a fixed-point number to an integer if it fits, otherwise returns [`None`].
///
/// Any fractional bits are discarded, which rounds towards −∞.
#[inline]
fn checked_from_fixed<F: Fixed>(src: F) -> Option<Self> {
FromFixed::checked_from_fixed(src).map(IntFixed::<$Int>::int)
}
/// Converts a fixed-point number to an integer, saturating if it does not fit.
///
/// Any fractional bits are discarded, which rounds towards −∞.
#[inline]
fn saturating_from_fixed<F: Fixed>(src: F) -> Self {
IntFixed::<$Int>::int(FromFixed::saturating_from_fixed(src))
}
/// Converts a fixed-point number to an integer, wrapping if it does not fit.
///
/// Any fractional bits are discarded, which rounds towards −∞.
#[inline]
fn wrapping_from_fixed<F: Fixed>(src: F) -> Self {
IntFixed::<$Int>::int(FromFixed::wrapping_from_fixed(src))
}
/// Converts a fixed-point number to an integer.
///
/// Returns a [tuple] of the value and a [`bool`] indicating whether
/// an overflow has occurred. On overflow, the wrapped value is
/// returned.
///
/// Any fractional bits are discarded, which rounds towards −∞.
#[inline]
fn overflowing_from_fixed<F: Fixed>(src: F) -> (Self, bool) {
let (fixed, overflow) = FromFixed::overflowing_from_fixed(src);
(IntFixed::<$Int>::int(fixed), overflow)
}
/// Converts a fixed-point number to an integer, panicking if it does not fit.
///
/// Any fractional bits are discarded, which rounds towards −∞.
///
/// # Panics
///
/// Panics if the value
/// does not fit, even when debug assertions are not enabled.
#[inline]
#[track_caller]
fn unwrapped_from_fixed<F: Fixed>(src: F) -> Self {
IntFixed::<$Int>::int(FromFixed::unwrapped_from_fixed(src))
}
}
impl ToFixed for $Int {
/// Converts an integer to a fixed-point number.
///
/// # Panics
///
/// When debug assertions are enabled, panics if the value
/// does not fit. When debug assertions are not enabled,
/// the wrapped value can be returned, but it is not
/// considered a breaking change if in the future it
/// panics; if wrapping is required use
/// [`wrapping_to_fixed`] instead.
///
/// [`wrapping_to_fixed`]: ToFixed::wrapping_to_fixed
#[inline]
#[track_caller]
fn to_fixed<F: Fixed>(self) -> F {
ToFixed::to_fixed(IntFixed(self).fixed())
}
/// Converts an integer to a fixed-point number if it fits, otherwise returns [`None`].
#[inline]
fn checked_to_fixed<F: Fixed>(self) -> Option<F> {
ToFixed::checked_to_fixed(IntFixed(self).fixed())
}
/// Converts an integer to a fixed-point number, saturating if it does not fit.
#[inline]
fn saturating_to_fixed<F: Fixed>(self) -> F {
ToFixed::saturating_to_fixed(IntFixed(self).fixed())
}
/// Converts an integer to a fixed-point number, wrapping if it does not fit.
#[inline]
fn wrapping_to_fixed<F: Fixed>(self) -> F {
ToFixed::wrapping_to_fixed(IntFixed(self).fixed())
}
/// Converts an integer to a fixed-point number.
///
/// Returns a [tuple] of the fixed-point number and a [`bool`]
/// indicating whether an overflow has occurred. On overflow, the
/// wrapped value is returned.
#[inline]
fn overflowing_to_fixed<F: Fixed>(self) -> (F, bool) {
ToFixed::overflowing_to_fixed(IntFixed(self).fixed())
}
/// Converts an integer to a fixed-point number, panicking if it does not fit.
///
/// # Panics
///
/// Panics if the value does not fit, even when debug
/// assertions are not enabled.
#[inline]
#[track_caller]
fn unwrapped_to_fixed<F: Fixed>(self) -> F {
ToFixed::unwrapped_to_fixed(IntFixed(self).fixed())
}
}
$(
impl FixedEquiv for $Int {
type Equiv = $Equiv<U0>;
#[inline]
fn to_fixed_equiv(self) -> $Equiv<U0> {
$Equiv::from_bits(self)
}
#[inline]
fn as_fixed_equiv(&self) -> &$Equiv<U0> {
$Equiv::wrap_ref(self)
}
#[inline]
fn as_fixed_equiv_mut(&mut self) -> &mut $Equiv<U0> {
$Equiv::wrap_mut(self)
}
#[inline]
fn from_fixed_equiv(f: $Equiv<U0>) -> $Int {
f.to_bits()
}
#[inline]
fn ref_from_fixed_equiv(f: &$Equiv<U0>) -> &$Int {
&f.bits
}
#[inline]
fn mut_from_fixed_equiv(f: &mut $Equiv<U0>) -> &mut $Int {
&mut f.bits
}
}
)*
};
}
impl_int! { i8, FixedI8 }
impl_int! { i16, FixedI16 }
impl_int! { i32, FixedI32 }
impl_int! { i64, FixedI64 }
impl_int! { i128, FixedI128 }
impl_int! { isize }
impl_int! { u8, FixedU8 }
impl_int! { u16, FixedU16 }
impl_int! { u32, FixedU32 }
impl_int! { u64, FixedU64 }
impl_int! { u128, FixedU128 }
impl_int! { usize }
macro_rules! impl_float {
($Float:ident, $link:expr, $overflows_fmt:expr, $overflows_filt:expr) => {
impl FromFixed for $Float {
/// Converts a fixed-point number to a floating-point number.
///
/// Rounding is to the nearest, with ties rounded to even.
///
/// # Panics
///
/// When debug assertions are enabled, panics if the value
/// does not fit. When debug assertions are not enabled,
/// the wrapped value can be returned, but it is not
/// considered a breaking change if in the future it
/// panics; if wrapping is required use
/// [`wrapping_from_fixed`] instead.
///
/// [`wrapping_from_fixed`]: FromFixed::wrapping_from_fixed
#[inline]
#[track_caller]
fn from_fixed<F: Fixed>(src: F) -> Self {
let helper = src.to_float_helper(Private);
float_helper::$Float::from_to_float_helper(helper, F::FRAC_NBITS, F::INT_NBITS)
}
/// Converts a fixed-point number to a floating-point
/// number if it fits, otherwise returns [`None`].
///
/// Rounding is to the nearest, with ties rounded to even.
#[inline]
fn checked_from_fixed<F: Fixed>(src: F) -> Option<Self> {
Some(FromFixed::from_fixed(src))
}
/// Converts a fixed-point number to a floating-point
/// number, saturating if it does not fit.
///
/// Rounding is to the nearest, with ties rounded to even.
#[inline]
fn saturating_from_fixed<F: Fixed>(src: F) -> Self {
FromFixed::from_fixed(src)
}
/// Converts a fixed-point number to a floating-point
/// number, wrapping if it does not fit.
///
/// Rounding is to the nearest, with ties rounded to even.
#[inline]
fn wrapping_from_fixed<F: Fixed>(src: F) -> Self {
FromFixed::from_fixed(src)
}
/// Converts a fixed-point number to a floating-point number.
///
/// Returns a [tuple] of the value and a [`bool`]
/// indicating whether an overflow has occurred. On
/// overflow, the wrapped value is returned.
///
/// Rounding is to the nearest, with ties rounded to even.
#[inline]
fn overflowing_from_fixed<F: Fixed>(src: F) -> (Self, bool) {
(FromFixed::from_fixed(src), false)
}
/// Converts a fixed-point number to a floating-point
/// number, panicking if it does not fit.
///
/// Rounding is to the nearest, with ties rounded to even.
///
/// # Panics
///
/// Panics if the value does not fit, even when debug
/// assertions are not enabled.
#[inline]
#[track_caller]
fn unwrapped_from_fixed<F: Fixed>(src: F) -> Self {
FromFixed::from_fixed(src)
}
}
impl ToFixed for $Float {
comment! {
"Converts a floating-point number to a fixed-point number.
Rounding is to the nearest, with ties rounded to even.
# Panics
Panics if `self` is not [finite].
When debug assertions are enabled, also panics if the value does not
fit. When debug assertions are not enabled, the wrapped value can be
returned, but it is not considered a breaking change if in the future
it panics; if wrapping is required use [`wrapping_to_fixed`] instead.
[`wrapping_to_fixed`]: ToFixed::wrapping_to_fixed
[finite]: ", $link, "::is_finite
";
#[inline]
#[track_caller]
fn to_fixed<F: Fixed>(self) -> F {
let (wrapped, overflow) = ToFixed::overflowing_to_fixed(self);
debug_assert!(!overflow, $overflows_fmt, $overflows_filt(self));
let _ = overflow;
wrapped
}
}
/// Converts a floating-point number to a fixed-point
/// number if it fits, otherwise returns [`None`].
///
/// Rounding is to the nearest, with ties rounded to even.
#[inline]
fn checked_to_fixed<F: Fixed>(self) -> Option<F> {
let kind = float_helper::$Float::to_float_kind(self, F::FRAC_NBITS, F::INT_NBITS);
match kind {
FloatKind::Finite { .. } => {
let helper = FromFloatHelper { kind };
match F::overflowing_from_float_helper(Private, helper) {
(_, true) => None,
(wrapped, false) => Some(wrapped),
}
}
_ => None,
}
}
comment! {
"Converts a floating-point number to a fixed-point
number, saturating if it does not fit.
Rounding is to the nearest, with ties rounded to even.
# Panics
Panics if `self` is [NaN].
[NaN]: ", $link, "::is_nan
";
#[inline]
#[track_caller]
fn saturating_to_fixed<F: Fixed>(self) -> F {
let kind =
float_helper::$Float::to_float_kind(self, F::FRAC_NBITS, F::INT_NBITS);
let helper = FromFloatHelper { kind };
F::saturating_from_float_helper(Private, helper)
}
}
comment! {
"Converts a floating-point number to a fixed-point
number, wrapping if it does not fit.
Rounding is to the nearest, with ties rounded to even.
# Panics
Panics if `self` is not [finite].
[finite]: ", $link, "::is_finite
";
#[inline]
#[track_caller]
fn wrapping_to_fixed<F: Fixed>(self) -> F {
let (wrapped, _) = ToFixed::overflowing_to_fixed(self);
wrapped
}
}
comment! {
"Converts a floating-point number to a fixed-point number.
Returns a [tuple] of the fixed-point number and a [`bool`] indicating
whether an overflow has occurred. On overflow, the wrapped value is
returned.
Rounding is to the nearest, with ties rounded to even.
# Panics
Panics if `self` is not [finite].
[finite]: ", $link, "::is_finite
";
#[inline]
#[track_caller]
fn overflowing_to_fixed<F: Fixed>(self) -> (F, bool) {
let kind =
float_helper::$Float::to_float_kind(self, F::FRAC_NBITS, F::INT_NBITS);
let helper = FromFloatHelper { kind };
F::overflowing_from_float_helper(Private, helper)
}
}
comment! {
"Converts a floating-point number to a fixed-point
number, panicking if it does not fit.
Rounding is to the nearest, with ties rounded to even.
# Panics
Panics if `self` is not [finite] or if the value does not fit, even
when debug assertions are not enabled.
[finite]: ", $link, "::is_finite
";
#[inline]
#[track_caller]
fn unwrapped_to_fixed<F: Fixed>(self) -> F {
match ToFixed::overflowing_to_fixed(self) {
(val, false) => val,
(_, true) => panic!("overflow"),
}
}
}
}
};
}
impl_float! { f16, "f16", "{} overflows", |x| x }
impl_float! { bf16, "bf16", "{} overflows", |x| x }
impl_float! { f32, "f32", "{} overflows", |x| x }
impl_float! { f64, "f64", "{} overflows", |x| x }
impl_float! { F128, "F128", "F128::from_bits(0x{:032X}) overflows", |x: F128| x.to_bits() }
impl_float! { F128Bits, "f64", "F128Bits({}) overflows", |x: F128Bits| x.0 }