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use crate::simd::intrinsics::{simd_saturating_add, simd_saturating_sub};
use crate::simd::{LaneCount, Simd, SupportedLaneCount};
macro_rules! impl_uint_arith {
($($ty:ty),+) => {
$( impl<const LANES: usize> Simd<$ty, LANES> where LaneCount<LANES>: SupportedLaneCount {
/// Lanewise saturating add.
///
/// # Examples
/// ```
/// # #![feature(portable_simd)]
/// # use core::simd::Simd;
#[doc = concat!("# use core::", stringify!($ty), "::MAX;")]
/// let x = Simd::from_array([2, 1, 0, MAX]);
/// let max = Simd::splat(MAX);
/// let unsat = x + max;
/// let sat = x.saturating_add(max);
/// assert_eq!(unsat, Simd::from_array([1, 0, MAX, MAX - 1]));
/// assert_eq!(sat, max);
/// ```
#[inline]
pub fn saturating_add(self, second: Self) -> Self {
// Safety: `self` is a vector
unsafe { simd_saturating_add(self, second) }
}
/// Lanewise saturating subtract.
///
/// # Examples
/// ```
/// # #![feature(portable_simd)]
/// # use core::simd::Simd;
#[doc = concat!("# use core::", stringify!($ty), "::MAX;")]
/// let x = Simd::from_array([2, 1, 0, MAX]);
/// let max = Simd::splat(MAX);
/// let unsat = x - max;
/// let sat = x.saturating_sub(max);
/// assert_eq!(unsat, Simd::from_array([3, 2, 1, 0]));
/// assert_eq!(sat, Simd::splat(0));
#[inline]
pub fn saturating_sub(self, second: Self) -> Self {
// Safety: `self` is a vector
unsafe { simd_saturating_sub(self, second) }
}
})+
}
}
macro_rules! impl_int_arith {
($($ty:ty),+) => {
$( impl<const LANES: usize> Simd<$ty, LANES> where LaneCount<LANES>: SupportedLaneCount {
/// Lanewise saturating add.
///
/// # Examples
/// ```
/// # #![feature(portable_simd)]
/// # use core::simd::Simd;
#[doc = concat!("# use core::", stringify!($ty), "::{MIN, MAX};")]
/// let x = Simd::from_array([MIN, 0, 1, MAX]);
/// let max = Simd::splat(MAX);
/// let unsat = x + max;
/// let sat = x.saturating_add(max);
/// assert_eq!(unsat, Simd::from_array([-1, MAX, MIN, -2]));
/// assert_eq!(sat, Simd::from_array([-1, MAX, MAX, MAX]));
/// ```
#[inline]
pub fn saturating_add(self, second: Self) -> Self {
// Safety: `self` is a vector
unsafe { simd_saturating_add(self, second) }
}
/// Lanewise saturating subtract.
///
/// # Examples
/// ```
/// # #![feature(portable_simd)]
/// # use core::simd::Simd;
#[doc = concat!("# use core::", stringify!($ty), "::{MIN, MAX};")]
/// let x = Simd::from_array([MIN, -2, -1, MAX]);
/// let max = Simd::splat(MAX);
/// let unsat = x - max;
/// let sat = x.saturating_sub(max);
/// assert_eq!(unsat, Simd::from_array([1, MAX, MIN, 0]));
/// assert_eq!(sat, Simd::from_array([MIN, MIN, MIN, 0]));
#[inline]
pub fn saturating_sub(self, second: Self) -> Self {
// Safety: `self` is a vector
unsafe { simd_saturating_sub(self, second) }
}
/// Lanewise absolute value, implemented in Rust.
/// Every lane becomes its absolute value.
///
/// # Examples
/// ```
/// # #![feature(portable_simd)]
/// # use core::simd::Simd;
#[doc = concat!("# use core::", stringify!($ty), "::{MIN, MAX};")]
/// let xs = Simd::from_array([MIN, MIN +1, -5, 0]);
/// assert_eq!(xs.abs(), Simd::from_array([MIN, MAX, 5, 0]));
/// ```
#[inline]
pub fn abs(self) -> Self {
const SHR: $ty = <$ty>::BITS as $ty - 1;
let m = self >> Simd::splat(SHR);
(self^m) - m
}
/// Lanewise saturating absolute value, implemented in Rust.
/// As abs(), except the MIN value becomes MAX instead of itself.
///
/// # Examples
/// ```
/// # #![feature(portable_simd)]
/// # use core::simd::Simd;
#[doc = concat!("# use core::", stringify!($ty), "::{MIN, MAX};")]
/// let xs = Simd::from_array([MIN, -2, 0, 3]);
/// let unsat = xs.abs();
/// let sat = xs.saturating_abs();
/// assert_eq!(unsat, Simd::from_array([MIN, 2, 0, 3]));
/// assert_eq!(sat, Simd::from_array([MAX, 2, 0, 3]));
/// ```
#[inline]
pub fn saturating_abs(self) -> Self {
// arith shift for -1 or 0 mask based on sign bit, giving 2s complement
const SHR: $ty = <$ty>::BITS as $ty - 1;
let m = self >> Simd::splat(SHR);
(self^m).saturating_sub(m)
}
/// Lanewise saturating negation, implemented in Rust.
/// As neg(), except the MIN value becomes MAX instead of itself.
///
/// # Examples
/// ```
/// # #![feature(portable_simd)]
/// # use core::simd::Simd;
#[doc = concat!("# use core::", stringify!($ty), "::{MIN, MAX};")]
/// let x = Simd::from_array([MIN, -2, 3, MAX]);
/// let unsat = -x;
/// let sat = x.saturating_neg();
/// assert_eq!(unsat, Simd::from_array([MIN, 2, -3, MIN + 1]));
/// assert_eq!(sat, Simd::from_array([MAX, 2, -3, MIN + 1]));
/// ```
#[inline]
pub fn saturating_neg(self) -> Self {
Self::splat(0).saturating_sub(self)
}
})+
}
}
impl_uint_arith! { u8, u16, u32, u64, usize }
impl_int_arith! { i8, i16, i32, i64, isize }