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#![allow(unused_imports)]
use super::MaskElement;
use crate::simd::intrinsics;
use crate::simd::{LaneCount, Simd, SupportedLaneCount, ToBitMask};
use core::marker::PhantomData;
/// A mask where each lane is represented by a single bit.
#[repr(transparent)]
pub struct Mask<T, const LANES: usize>(
<LaneCount<LANES> as SupportedLaneCount>::BitMask,
PhantomData<T>,
)
where
T: MaskElement,
LaneCount<LANES>: SupportedLaneCount;
impl<T, const LANES: usize> Copy for Mask<T, LANES>
where
T: MaskElement,
LaneCount<LANES>: SupportedLaneCount,
{
}
impl<T, const LANES: usize> Clone for Mask<T, LANES>
where
T: MaskElement,
LaneCount<LANES>: SupportedLaneCount,
{
fn clone(&self) -> Self {
*self
}
}
impl<T, const LANES: usize> PartialEq for Mask<T, LANES>
where
T: MaskElement,
LaneCount<LANES>: SupportedLaneCount,
{
fn eq(&self, other: &Self) -> bool {
self.0.as_ref() == other.0.as_ref()
}
}
impl<T, const LANES: usize> PartialOrd for Mask<T, LANES>
where
T: MaskElement,
LaneCount<LANES>: SupportedLaneCount,
{
fn partial_cmp(&self, other: &Self) -> Option<core::cmp::Ordering> {
self.0.as_ref().partial_cmp(other.0.as_ref())
}
}
impl<T, const LANES: usize> Eq for Mask<T, LANES>
where
T: MaskElement,
LaneCount<LANES>: SupportedLaneCount,
{
}
impl<T, const LANES: usize> Ord for Mask<T, LANES>
where
T: MaskElement,
LaneCount<LANES>: SupportedLaneCount,
{
fn cmp(&self, other: &Self) -> core::cmp::Ordering {
self.0.as_ref().cmp(other.0.as_ref())
}
}
impl<T, const LANES: usize> Mask<T, LANES>
where
T: MaskElement,
LaneCount<LANES>: SupportedLaneCount,
{
#[inline]
#[must_use = "method returns a new mask and does not mutate the original value"]
pub fn splat(value: bool) -> Self {
let mut mask = <LaneCount<LANES> as SupportedLaneCount>::BitMask::default();
if value {
mask.as_mut().fill(u8::MAX)
} else {
mask.as_mut().fill(u8::MIN)
}
if LANES % 8 > 0 {
*mask.as_mut().last_mut().unwrap() &= u8::MAX >> (8 - LANES % 8);
}
Self(mask, PhantomData)
}
#[inline]
#[must_use = "method returns a new bool and does not mutate the original value"]
pub unsafe fn test_unchecked(&self, lane: usize) -> bool {
(self.0.as_ref()[lane / 8] >> (lane % 8)) & 0x1 > 0
}
#[inline]
pub unsafe fn set_unchecked(&mut self, lane: usize, value: bool) {
unsafe {
self.0.as_mut()[lane / 8] ^= ((value ^ self.test_unchecked(lane)) as u8) << (lane % 8)
}
}
#[inline]
#[must_use = "method returns a new vector and does not mutate the original value"]
pub fn to_int(self) -> Simd<T, LANES> {
unsafe {
intrinsics::simd_select_bitmask(self.0, Simd::splat(T::TRUE), Simd::splat(T::FALSE))
}
}
#[inline]
#[must_use = "method returns a new mask and does not mutate the original value"]
pub unsafe fn from_int_unchecked(value: Simd<T, LANES>) -> Self {
unsafe { Self(intrinsics::simd_bitmask(value), PhantomData) }
}
#[cfg(feature = "generic_const_exprs")]
#[inline]
#[must_use = "method returns a new array and does not mutate the original value"]
pub fn to_bitmask_array<const N: usize>(self) -> [u8; N] {
assert!(core::mem::size_of::<Self>() == N);
// Safety: converting an integer to an array of bytes of the same size is safe
unsafe { core::mem::transmute_copy(&self.0) }
}
#[cfg(feature = "generic_const_exprs")]
#[inline]
#[must_use = "method returns a new mask and does not mutate the original value"]
pub fn from_bitmask_array<const N: usize>(bitmask: [u8; N]) -> Self {
assert!(core::mem::size_of::<Self>() == N);
// Safety: converting an array of bytes to an integer of the same size is safe
Self(unsafe { core::mem::transmute_copy(&bitmask) }, PhantomData)
}
#[inline]
pub fn to_bitmask_integer<U>(self) -> U
where
super::Mask<T, LANES>: ToBitMask<BitMask = U>,
{
// Safety: these are the same types
unsafe { core::mem::transmute_copy(&self.0) }
}
#[inline]
pub fn from_bitmask_integer<U>(bitmask: U) -> Self
where
super::Mask<T, LANES>: ToBitMask<BitMask = U>,
{
// Safety: these are the same types
unsafe { Self(core::mem::transmute_copy(&bitmask), PhantomData) }
}
#[inline]
#[must_use = "method returns a new mask and does not mutate the original value"]
pub fn convert<U>(self) -> Mask<U, LANES>
where
U: MaskElement,
{
// Safety: bitmask layout does not depend on the element width
unsafe { core::mem::transmute_copy(&self) }
}
#[inline]
#[must_use = "method returns a new bool and does not mutate the original value"]
pub fn any(self) -> bool {
self != Self::splat(false)
}
#[inline]
#[must_use = "method returns a new bool and does not mutate the original value"]
pub fn all(self) -> bool {
self == Self::splat(true)
}
}
impl<T, const LANES: usize> core::ops::BitAnd for Mask<T, LANES>
where
T: MaskElement,
LaneCount<LANES>: SupportedLaneCount,
<LaneCount<LANES> as SupportedLaneCount>::BitMask: AsRef<[u8]> + AsMut<[u8]>,
{
type Output = Self;
#[inline]
#[must_use = "method returns a new mask and does not mutate the original value"]
fn bitand(mut self, rhs: Self) -> Self {
for (l, r) in self.0.as_mut().iter_mut().zip(rhs.0.as_ref().iter()) {
*l &= r;
}
self
}
}
impl<T, const LANES: usize> core::ops::BitOr for Mask<T, LANES>
where
T: MaskElement,
LaneCount<LANES>: SupportedLaneCount,
<LaneCount<LANES> as SupportedLaneCount>::BitMask: AsRef<[u8]> + AsMut<[u8]>,
{
type Output = Self;
#[inline]
#[must_use = "method returns a new mask and does not mutate the original value"]
fn bitor(mut self, rhs: Self) -> Self {
for (l, r) in self.0.as_mut().iter_mut().zip(rhs.0.as_ref().iter()) {
*l |= r;
}
self
}
}
impl<T, const LANES: usize> core::ops::BitXor for Mask<T, LANES>
where
T: MaskElement,
LaneCount<LANES>: SupportedLaneCount,
{
type Output = Self;
#[inline]
#[must_use = "method returns a new mask and does not mutate the original value"]
fn bitxor(mut self, rhs: Self) -> Self::Output {
for (l, r) in self.0.as_mut().iter_mut().zip(rhs.0.as_ref().iter()) {
*l ^= r;
}
self
}
}
impl<T, const LANES: usize> core::ops::Not for Mask<T, LANES>
where
T: MaskElement,
LaneCount<LANES>: SupportedLaneCount,
{
type Output = Self;
#[inline]
#[must_use = "method returns a new mask and does not mutate the original value"]
fn not(mut self) -> Self::Output {
for x in self.0.as_mut() {
*x = !*x;
}
if LANES % 8 > 0 {
*self.0.as_mut().last_mut().unwrap() &= u8::MAX >> (8 - LANES % 8);
}
self
}
}
|
