core/portable-simd/crates/core_simd/src/masks/
full_masks.rsuse crate::simd::{LaneCount, MaskElement, Simd, SupportedLaneCount};
#[repr(transparent)]
pub struct Mask<T, const N: usize>(Simd<T, N>)
where
    T: MaskElement,
    LaneCount<N>: SupportedLaneCount;
impl<T, const N: usize> Copy for Mask<T, N>
where
    T: MaskElement,
    LaneCount<N>: SupportedLaneCount,
{
}
impl<T, const N: usize> Clone for Mask<T, N>
where
    T: MaskElement,
    LaneCount<N>: SupportedLaneCount,
{
    #[inline]
    #[must_use = "method returns a new mask and does not mutate the original value"]
    fn clone(&self) -> Self {
        *self
    }
}
impl<T, const N: usize> PartialEq for Mask<T, N>
where
    T: MaskElement + PartialEq,
    LaneCount<N>: SupportedLaneCount,
{
    #[inline]
    fn eq(&self, other: &Self) -> bool {
        self.0.eq(&other.0)
    }
}
impl<T, const N: usize> PartialOrd for Mask<T, N>
where
    T: MaskElement + PartialOrd,
    LaneCount<N>: SupportedLaneCount,
{
    #[inline]
    fn partial_cmp(&self, other: &Self) -> Option<core::cmp::Ordering> {
        self.0.partial_cmp(&other.0)
    }
}
impl<T, const N: usize> Eq for Mask<T, N>
where
    T: MaskElement + Eq,
    LaneCount<N>: SupportedLaneCount,
{
}
impl<T, const N: usize> Ord for Mask<T, N>
where
    T: MaskElement + Ord,
    LaneCount<N>: SupportedLaneCount,
{
    #[inline]
    fn cmp(&self, other: &Self) -> core::cmp::Ordering {
        self.0.cmp(&other.0)
    }
}
pub(crate) trait ReverseBits {
    fn reverse_bits(self, n: usize) -> Self;
}
macro_rules! impl_reverse_bits {
    { $($int:ty),* } => {
        $(
        impl ReverseBits for $int {
            #[inline(always)]
            fn reverse_bits(self, n: usize) -> Self {
                let rev = <$int>::reverse_bits(self);
                let bitsize = core::mem::size_of::<$int>() * 8;
                if n < bitsize {
                    rev >> (bitsize - n)
                } else {
                    rev
                }
            }
        }
        )*
    }
}
impl_reverse_bits! { u8, u16, u32, u64 }
impl<T, const N: usize> Mask<T, N>
where
    T: MaskElement,
    LaneCount<N>: SupportedLaneCount,
{
    #[inline]
    #[must_use = "method returns a new mask and does not mutate the original value"]
    pub fn splat(value: bool) -> Self {
        Self(Simd::splat(if value { T::TRUE } else { T::FALSE }))
    }
    #[inline]
    #[must_use = "method returns a new bool and does not mutate the original value"]
    pub unsafe fn test_unchecked(&self, lane: usize) -> bool {
        T::eq(self.0[lane], T::TRUE)
    }
    #[inline]
    pub unsafe fn set_unchecked(&mut self, lane: usize, value: bool) {
        self.0[lane] = if value { T::TRUE } else { T::FALSE }
    }
    #[inline]
    #[must_use = "method returns a new vector and does not mutate the original value"]
    pub fn to_int(self) -> Simd<T, N> {
        self.0
    }
    #[inline]
    #[must_use = "method returns a new mask and does not mutate the original value"]
    pub unsafe fn from_int_unchecked(value: Simd<T, N>) -> Self {
        Self(value)
    }
    #[inline]
    #[must_use = "method returns a new mask and does not mutate the original value"]
    pub fn convert<U>(self) -> Mask<U, N>
    where
        U: MaskElement,
    {
        unsafe { Mask(core::intrinsics::simd::simd_cast(self.0)) }
    }
    #[inline]
    #[must_use = "method returns a new vector and does not mutate the original value"]
    pub fn to_bitmask_vector(self) -> Simd<u8, N> {
        let mut bitmask = Simd::splat(0);
        unsafe {
            let mut bytes: <LaneCount<N> as SupportedLaneCount>::BitMask =
                core::intrinsics::simd::simd_bitmask(self.0);
            if cfg!(target_endian = "big") {
                for x in bytes.as_mut() {
                    *x = x.reverse_bits()
                }
                if N % 8 > 0 {
                    bytes.as_mut()[N / 8] >>= 8 - N % 8;
                }
            }
            bitmask.as_mut_array()[..bytes.as_ref().len()].copy_from_slice(bytes.as_ref());
        }
        bitmask
    }
    #[inline]
    #[must_use = "method returns a new mask and does not mutate the original value"]
    pub fn from_bitmask_vector(bitmask: Simd<u8, N>) -> Self {
        let mut bytes = <LaneCount<N> as SupportedLaneCount>::BitMask::default();
        unsafe {
            let len = bytes.as_ref().len();
            bytes.as_mut().copy_from_slice(&bitmask.as_array()[..len]);
            if cfg!(target_endian = "big") {
                for x in bytes.as_mut() {
                    *x = x.reverse_bits();
                }
                if N % 8 > 0 {
                    bytes.as_mut()[N / 8] >>= 8 - N % 8;
                }
            }
            Self::from_int_unchecked(core::intrinsics::simd::simd_select_bitmask(
                bytes,
                Self::splat(true).to_int(),
                Self::splat(false).to_int(),
            ))
        }
    }
    #[inline]
    unsafe fn to_bitmask_impl<U: ReverseBits, const M: usize>(self) -> U
    where
        LaneCount<M>: SupportedLaneCount,
    {
        let resized = self.to_int().resize::<M>(T::FALSE);
        let bitmask: U = unsafe { core::intrinsics::simd::simd_bitmask(resized) };
        if cfg!(target_endian = "big") {
            bitmask.reverse_bits(M)
        } else {
            bitmask
        }
    }
    #[inline]
    unsafe fn from_bitmask_impl<U: ReverseBits, const M: usize>(bitmask: U) -> Self
    where
        LaneCount<M>: SupportedLaneCount,
    {
        let bitmask = if cfg!(target_endian = "big") {
            bitmask.reverse_bits(M)
        } else {
            bitmask
        };
        let mask: Simd<T, M> = unsafe {
            core::intrinsics::simd::simd_select_bitmask(
                bitmask,
                Simd::<T, M>::splat(T::TRUE),
                Simd::<T, M>::splat(T::FALSE),
            )
        };
        unsafe { Self::from_int_unchecked(mask.resize::<N>(T::FALSE)) }
    }
    #[inline]
    pub(crate) fn to_bitmask_integer(self) -> u64 {
        if N <= 8 {
            unsafe { self.to_bitmask_impl::<u8, 8>() as u64 }
        } else if N <= 16 {
            unsafe { self.to_bitmask_impl::<u16, 16>() as u64 }
        } else if N <= 32 {
            unsafe { self.to_bitmask_impl::<u32, 32>() as u64 }
        } else {
            unsafe { self.to_bitmask_impl::<u64, 64>() }
        }
    }
    #[inline]
    pub(crate) fn from_bitmask_integer(bitmask: u64) -> Self {
        if N <= 8 {
            unsafe { Self::from_bitmask_impl::<u8, 8>(bitmask as u8) }
        } else if N <= 16 {
            unsafe { Self::from_bitmask_impl::<u16, 16>(bitmask as u16) }
        } else if N <= 32 {
            unsafe { Self::from_bitmask_impl::<u32, 32>(bitmask as u32) }
        } else {
            unsafe { Self::from_bitmask_impl::<u64, 64>(bitmask) }
        }
    }
    #[inline]
    #[must_use = "method returns a new bool and does not mutate the original value"]
    pub fn any(self) -> bool {
        unsafe { core::intrinsics::simd::simd_reduce_any(self.to_int()) }
    }
    #[inline]
    #[must_use = "method returns a new vector and does not mutate the original value"]
    pub fn all(self) -> bool {
        unsafe { core::intrinsics::simd::simd_reduce_all(self.to_int()) }
    }
}
impl<T, const N: usize> From<Mask<T, N>> for Simd<T, N>
where
    T: MaskElement,
    LaneCount<N>: SupportedLaneCount,
{
    #[inline]
    fn from(value: Mask<T, N>) -> Self {
        value.0
    }
}
impl<T, const N: usize> core::ops::BitAnd for Mask<T, N>
where
    T: MaskElement,
    LaneCount<N>: SupportedLaneCount,
{
    type Output = Self;
    #[inline]
    #[must_use = "method returns a new mask and does not mutate the original value"]
    fn bitand(self, rhs: Self) -> Self {
        unsafe { Self(core::intrinsics::simd::simd_and(self.0, rhs.0)) }
    }
}
impl<T, const N: usize> core::ops::BitOr for Mask<T, N>
where
    T: MaskElement,
    LaneCount<N>: SupportedLaneCount,
{
    type Output = Self;
    #[inline]
    #[must_use = "method returns a new mask and does not mutate the original value"]
    fn bitor(self, rhs: Self) -> Self {
        unsafe { Self(core::intrinsics::simd::simd_or(self.0, rhs.0)) }
    }
}
impl<T, const N: usize> core::ops::BitXor for Mask<T, N>
where
    T: MaskElement,
    LaneCount<N>: SupportedLaneCount,
{
    type Output = Self;
    #[inline]
    #[must_use = "method returns a new mask and does not mutate the original value"]
    fn bitxor(self, rhs: Self) -> Self {
        unsafe { Self(core::intrinsics::simd::simd_xor(self.0, rhs.0)) }
    }
}
impl<T, const N: usize> core::ops::Not for Mask<T, N>
where
    T: MaskElement,
    LaneCount<N>: SupportedLaneCount,
{
    type Output = Self;
    #[inline]
    #[must_use = "method returns a new mask and does not mutate the original value"]
    fn not(self) -> Self::Output {
        Self::splat(true) ^ self
    }
}