arm/usr/lib/rustlib/src/rust/library/portable-simd/crates/core_simd/src/masks.rs - manifest_repos/toolchain - Git at Google

 //! Types and traits associated with masking lanes of vectors.
 //! Types representing
 #![allow(non_camel_case_types)]

 #[cfg_attr(
     not(all(target_arch = "x86_64", target_feature = "avx512f")),
     path = "masks/full_masks.rs"
 )]
 #[cfg_attr(
     all(target_arch = "x86_64", target_feature = "avx512f"),
     path = "masks/bitmask.rs"
 )]
 mod mask_impl;

 mod to_bitmask;
 pub use to_bitmask::ToBitMask;

 #[cfg(feature = "generic_const_exprs")]
 pub use to_bitmask::{bitmask_len, ToBitMaskArray};

 use crate::simd::{intrinsics, LaneCount, Simd, SimdElement, SimdPartialEq, SupportedLaneCount};
 use core::cmp::Ordering;
 use core::{fmt, mem};

 mod sealed {
     use super::*;

     /// Not only does this seal the `MaskElement` trait, but these functions prevent other traits
     /// from bleeding into the parent bounds.
     ///
     /// For example, `eq` could be provided by requiring `MaskElement: PartialEq`, but that would
     /// prevent us from ever removing that bound, or from implementing `MaskElement` on
     /// non-`PartialEq` types in the future.
     pub trait Sealed {
         fn valid<const LANES: usize>(values: Simd<Self, LANES>) -> bool
         where
             LaneCount<LANES>: SupportedLaneCount,
             Self: SimdElement;

         fn eq(self, other: Self) -> bool;

         const TRUE: Self;

         const FALSE: Self;
     }
 }
 use sealed::Sealed;

 /// Marker trait for types that may be used as SIMD mask elements.
 ///
 /// # Safety
 /// Type must be a signed integer.
 pub unsafe trait MaskElement: SimdElement + Sealed {}

 macro_rules! impl_element {
     { $ty:ty } => {
         impl Sealed for $ty {
             fn valid<const LANES: usize>(value: Simd<Self, LANES>) -> bool
             where
                 LaneCount<LANES>: SupportedLaneCount,
             {
                 (value.simd_eq(Simd::splat(0 as _)) | value.simd_eq(Simd::splat(-1 as _))).all()
             }

             fn eq(self, other: Self) -> bool { self == other }

             const TRUE: Self = -1;
             const FALSE: Self = 0;
         }

         // Safety: this is a valid mask element type
         unsafe impl MaskElement for $ty {}
     }
 }

 impl_element! { i8 }
 impl_element! { i16 }
 impl_element! { i32 }
 impl_element! { i64 }
 impl_element! { isize }

 /// A SIMD vector mask for `LANES` elements of width specified by `Element`.
 ///
 /// Masks represent boolean inclusion/exclusion on a per-lane basis.
 ///
 /// The layout of this type is unspecified.
 #[repr(transparent)]
 pub struct Mask<T, const LANES: usize>(mask_impl::Mask<T, LANES>)
 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> Mask<T, LANES>
 where
     T: MaskElement,
     LaneCount<LANES>: SupportedLaneCount,
 {
     /// Construct a mask by setting all lanes to the given value.
     pub fn splat(value: bool) -> Self {
         Self(mask_impl::Mask::splat(value))
     }

     /// Converts an array of bools to a SIMD mask.
     pub fn from_array(array: [bool; LANES]) -> Self {
         // SAFETY: Rust's bool has a layout of 1 byte (u8) with a value of
         //     true:    0b_0000_0001
         //     false:   0b_0000_0000
         // Thus, an array of bools is also a valid array of bytes: [u8; N]
         // This would be hypothetically valid as an "in-place" transmute,
         // but these are "dependently-sized" types, so copy elision it is!
         unsafe {
             let bytes: [u8; LANES] = mem::transmute_copy(&array);
             let bools: Simd<i8, LANES> =
                 intrinsics::simd_ne(Simd::from_array(bytes), Simd::splat(0u8));
             Mask::from_int_unchecked(intrinsics::simd_cast(bools))
         }
     }

     /// Converts a SIMD mask to an array of bools.
     pub fn to_array(self) -> [bool; LANES] {
         // This follows mostly the same logic as from_array.
         // SAFETY: Rust's bool has a layout of 1 byte (u8) with a value of
         //     true:    0b_0000_0001
         //     false:   0b_0000_0000
         // Thus, an array of bools is also a valid array of bytes: [u8; N]
         // Since our masks are equal to integers where all bits are set,
         // we can simply convert them to i8s, and then bitand them by the
         // bitpattern for Rust's "true" bool.
         // This would be hypothetically valid as an "in-place" transmute,
         // but these are "dependently-sized" types, so copy elision it is!
         unsafe {
             let mut bytes: Simd<i8, LANES> = intrinsics::simd_cast(self.to_int());
             bytes &= Simd::splat(1i8);
             mem::transmute_copy(&bytes)
         }
     }

     /// Converts a vector of integers to a mask, where 0 represents `false` and -1
     /// represents `true`.
     ///
     /// # Safety
     /// All lanes must be either 0 or -1.
     #[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 {
         // Safety: the caller must confirm this invariant
         unsafe { Self(mask_impl::Mask::from_int_unchecked(value)) }
     }

     /// Converts a vector of integers to a mask, where 0 represents `false` and -1
     /// represents `true`.
     ///
     /// # Panics
     /// Panics if any lane is not 0 or -1.
     #[inline]
     #[must_use = "method returns a new mask and does not mutate the original value"]
     pub fn from_int(value: Simd<T, LANES>) -> Self {
         assert!(T::valid(value), "all values must be either 0 or -1",);
         // Safety: the validity has been checked
         unsafe { Self::from_int_unchecked(value) }
     }

     /// Converts the mask to a vector of integers, where 0 represents `false` and -1
     /// represents `true`.
     #[inline]
     #[must_use = "method returns a new vector and does not mutate the original value"]
     pub fn to_int(self) -> Simd<T, LANES> {
         self.0.to_int()
     }

     /// Converts the mask to a mask of any other lane size.
     #[inline]
     #[must_use = "method returns a new mask and does not mutate the original value"]
     pub fn cast<U: MaskElement>(self) -> Mask<U, LANES> {
         Mask(self.0.convert())
     }

     /// Tests the value of the specified lane.
     ///
     /// # Safety
     /// `lane` must be less than `LANES`.
     #[inline]
     #[must_use = "method returns a new bool and does not mutate the original value"]
     pub unsafe fn test_unchecked(&self, lane: usize) -> bool {
         // Safety: the caller must confirm this invariant
         unsafe { self.0.test_unchecked(lane) }
     }

     /// Tests the value of the specified lane.
     ///
     /// # Panics
     /// Panics if `lane` is greater than or equal to the number of lanes in the vector.
     #[inline]
     #[must_use = "method returns a new bool and does not mutate the original value"]
     pub fn test(&self, lane: usize) -> bool {
         assert!(lane < LANES, "lane index out of range");
         // Safety: the lane index has been checked
         unsafe { self.test_unchecked(lane) }
     }

     /// Sets the value of the specified lane.
     ///
     /// # Safety
     /// `lane` must be less than `LANES`.
     #[inline]
     pub unsafe fn set_unchecked(&mut self, lane: usize, value: bool) {
         // Safety: the caller must confirm this invariant
         unsafe {
             self.0.set_unchecked(lane, value);
         }
     }

     /// Sets the value of the specified lane.
     ///
     /// # Panics
     /// Panics if `lane` is greater than or equal to the number of lanes in the vector.
     #[inline]
     pub fn set(&mut self, lane: usize, value: bool) {
         assert!(lane < LANES, "lane index out of range");
         // Safety: the lane index has been checked
         unsafe {
             self.set_unchecked(lane, value);
         }
     }

     /// Returns true if any lane is set, or false otherwise.
     #[inline]
     #[must_use = "method returns a new bool and does not mutate the original value"]
     pub fn any(self) -> bool {
         self.0.any()
     }

     /// Returns true if all lanes are set, or false otherwise.
     #[inline]
     #[must_use = "method returns a new bool and does not mutate the original value"]
     pub fn all(self) -> bool {
         self.0.all()
     }
 }

 // vector/array conversion
 impl<T, const LANES: usize> From<[bool; LANES]> for Mask<T, LANES>
 where
     T: MaskElement,
     LaneCount<LANES>: SupportedLaneCount,
 {
     fn from(array: [bool; LANES]) -> Self {
         Self::from_array(array)
     }
 }

 impl<T, const LANES: usize> From<Mask<T, LANES>> for [bool; LANES]
 where
     T: MaskElement,
     LaneCount<LANES>: SupportedLaneCount,
 {
     fn from(vector: Mask<T, LANES>) -> Self {
         vector.to_array()
     }
 }

 impl<T, const LANES: usize> Default for Mask<T, LANES>
 where
     T: MaskElement,
     LaneCount<LANES>: SupportedLaneCount,
 {
     #[inline]
     #[must_use = "method returns a defaulted mask with all lanes set to false (0)"]
     fn default() -> Self {
         Self::splat(false)
     }
 }

 impl<T, const LANES: usize> PartialEq for Mask<T, LANES>
 where
     T: MaskElement + PartialEq,
     LaneCount<LANES>: SupportedLaneCount,
 {
     #[inline]
     #[must_use = "method returns a new bool and does not mutate the original value"]
     fn eq(&self, other: &Self) -> bool {
         self.0 == other.0
     }
 }

 impl<T, const LANES: usize> PartialOrd for Mask<T, LANES>
 where
     T: MaskElement + PartialOrd,
     LaneCount<LANES>: SupportedLaneCount,
 {
     #[inline]
     #[must_use = "method returns a new Ordering and does not mutate the original value"]
     fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
         self.0.partial_cmp(&other.0)
     }
 }

 impl<T, const LANES: usize> fmt::Debug for Mask<T, LANES>
 where
     T: MaskElement + fmt::Debug,
     LaneCount<LANES>: SupportedLaneCount,
 {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         f.debug_list()
             .entries((0..LANES).map(|lane| self.test(lane)))
             .finish()
     }
 }

 impl<T, const LANES: usize> core::ops::BitAnd 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 bitand(self, rhs: Self) -> Self {
         Self(self.0 & rhs.0)
     }
 }

 impl<T, const LANES: usize> core::ops::BitAnd<bool> 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 bitand(self, rhs: bool) -> Self {
         self & Self::splat(rhs)
     }
 }

 impl<T, const LANES: usize> core::ops::BitAnd<Mask<T, LANES>> for bool
 where
     T: MaskElement,
     LaneCount<LANES>: SupportedLaneCount,
 {
     type Output = Mask<T, LANES>;
     #[inline]
     #[must_use = "method returns a new mask and does not mutate the original value"]
     fn bitand(self, rhs: Mask<T, LANES>) -> Mask<T, LANES> {
         Mask::splat(self) & rhs
     }
 }

 impl<T, const LANES: usize> core::ops::BitOr 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 bitor(self, rhs: Self) -> Self {
         Self(self.0 | rhs.0)
     }
 }

 impl<T, const LANES: usize> core::ops::BitOr<bool> 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 bitor(self, rhs: bool) -> Self {
         self | Self::splat(rhs)
     }
 }

 impl<T, const LANES: usize> core::ops::BitOr<Mask<T, LANES>> for bool
 where
     T: MaskElement,
     LaneCount<LANES>: SupportedLaneCount,
 {
     type Output = Mask<T, LANES>;
     #[inline]
     #[must_use = "method returns a new mask and does not mutate the original value"]
     fn bitor(self, rhs: Mask<T, LANES>) -> Mask<T, LANES> {
         Mask::splat(self) | rhs
     }
 }

 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(self, rhs: Self) -> Self::Output {
         Self(self.0 ^ rhs.0)
     }
 }

 impl<T, const LANES: usize> core::ops::BitXor<bool> 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(self, rhs: bool) -> Self::Output {
         self ^ Self::splat(rhs)
     }
 }

 impl<T, const LANES: usize> core::ops::BitXor<Mask<T, LANES>> for bool
 where
     T: MaskElement,
     LaneCount<LANES>: SupportedLaneCount,
 {
     type Output = Mask<T, LANES>;
     #[inline]
     #[must_use = "method returns a new mask and does not mutate the original value"]
     fn bitxor(self, rhs: Mask<T, LANES>) -> Self::Output {
         Mask::splat(self) ^ rhs
     }
 }

 impl<T, const LANES: usize> core::ops::Not for Mask<T, LANES>
 where
     T: MaskElement,
     LaneCount<LANES>: SupportedLaneCount,
 {
     type Output = Mask<T, LANES>;
     #[inline]
     #[must_use = "method returns a new mask and does not mutate the original value"]
     fn not(self) -> Self::Output {
         Self(!self.0)
     }
 }

 impl<T, const LANES: usize> core::ops::BitAndAssign for Mask<T, LANES>
 where
     T: MaskElement,
     LaneCount<LANES>: SupportedLaneCount,
 {
     #[inline]
     fn bitand_assign(&mut self, rhs: Self) {
         self.0 = self.0 & rhs.0;
     }
 }

 impl<T, const LANES: usize> core::ops::BitAndAssign<bool> for Mask<T, LANES>
 where
     T: MaskElement,
     LaneCount<LANES>: SupportedLaneCount,
 {
     #[inline]
     fn bitand_assign(&mut self, rhs: bool) {
         *self &= Self::splat(rhs);
     }
 }

 impl<T, const LANES: usize> core::ops::BitOrAssign for Mask<T, LANES>
 where
     T: MaskElement,
     LaneCount<LANES>: SupportedLaneCount,
 {
     #[inline]
     fn bitor_assign(&mut self, rhs: Self) {
         self.0 = self.0 | rhs.0;
     }
 }

 impl<T, const LANES: usize> core::ops::BitOrAssign<bool> for Mask<T, LANES>
 where
     T: MaskElement,
     LaneCount<LANES>: SupportedLaneCount,
 {
     #[inline]
     fn bitor_assign(&mut self, rhs: bool) {
         *self |= Self::splat(rhs);
     }
 }

 impl<T, const LANES: usize> core::ops::BitXorAssign for Mask<T, LANES>
 where
     T: MaskElement,
     LaneCount<LANES>: SupportedLaneCount,
 {
     #[inline]
     fn bitxor_assign(&mut self, rhs: Self) {
         self.0 = self.0 ^ rhs.0;
     }
 }

 impl<T, const LANES: usize> core::ops::BitXorAssign<bool> for Mask<T, LANES>
 where
     T: MaskElement,
     LaneCount<LANES>: SupportedLaneCount,
 {
     #[inline]
     fn bitxor_assign(&mut self, rhs: bool) {
         *self ^= Self::splat(rhs);
     }
 }

 /// A mask for SIMD vectors with eight elements of 8 bits.
 pub type mask8x8 = Mask<i8, 8>;

 /// A mask for SIMD vectors with 16 elements of 8 bits.
 pub type mask8x16 = Mask<i8, 16>;

 /// A mask for SIMD vectors with 32 elements of 8 bits.
 pub type mask8x32 = Mask<i8, 32>;

 /// A mask for SIMD vectors with 64 elements of 8 bits.
 pub type mask8x64 = Mask<i8, 64>;

 /// A mask for SIMD vectors with four elements of 16 bits.
 pub type mask16x4 = Mask<i16, 4>;

 /// A mask for SIMD vectors with eight elements of 16 bits.
 pub type mask16x8 = Mask<i16, 8>;

 /// A mask for SIMD vectors with 16 elements of 16 bits.
 pub type mask16x16 = Mask<i16, 16>;

 /// A mask for SIMD vectors with 32 elements of 16 bits.
 pub type mask16x32 = Mask<i16, 32>;

 /// A mask for SIMD vectors with two elements of 32 bits.
 pub type mask32x2 = Mask<i32, 2>;

 /// A mask for SIMD vectors with four elements of 32 bits.
 pub type mask32x4 = Mask<i32, 4>;

 /// A mask for SIMD vectors with eight elements of 32 bits.
 pub type mask32x8 = Mask<i32, 8>;

 /// A mask for SIMD vectors with 16 elements of 32 bits.
 pub type mask32x16 = Mask<i32, 16>;

 /// A mask for SIMD vectors with two elements of 64 bits.
 pub type mask64x2 = Mask<i64, 2>;

 /// A mask for SIMD vectors with four elements of 64 bits.
 pub type mask64x4 = Mask<i64, 4>;

 /// A mask for SIMD vectors with eight elements of 64 bits.
 pub type mask64x8 = Mask<i64, 8>;

 /// A mask for SIMD vectors with two elements of pointer width.
 pub type masksizex2 = Mask<isize, 2>;

 /// A mask for SIMD vectors with four elements of pointer width.
 pub type masksizex4 = Mask<isize, 4>;

 /// A mask for SIMD vectors with eight elements of pointer width.
 pub type masksizex8 = Mask<isize, 8>;

 macro_rules! impl_from {
     { $from:ty  => $($to:ty),* } => {
         $(
         impl<const LANES: usize> From<Mask<$from, LANES>> for Mask<$to, LANES>
         where
             LaneCount<LANES>: SupportedLaneCount,
         {
             fn from(value: Mask<$from, LANES>) -> Self {
                 value.cast()
             }
         }
         )*
     }
 }
 impl_from! { i8 => i16, i32, i64, isize }
 impl_from! { i16 => i32, i64, isize, i8 }
 impl_from! { i32 => i64, isize, i8, i16 }
 impl_from! { i64 => isize, i8, i16, i32 }
 impl_from! { isize => i8, i16, i32, i64 }
	//! Types and traits associated with masking lanes of vectors.
	//! Types representing
	#![allow(non_camel_case_types)]

	#[cfg_attr(
	not(all(target_arch = "x86_64", target_feature = "avx512f")),
	path = "masks/full_masks.rs"
	)]
	#[cfg_attr(
	all(target_arch = "x86_64", target_feature = "avx512f"),
	path = "masks/bitmask.rs"
	)]
	mod mask_impl;

	mod to_bitmask;
	pub use to_bitmask::ToBitMask;

	#[cfg(feature = "generic_const_exprs")]
	pub use to_bitmask::{bitmask_len, ToBitMaskArray};

	use crate::simd::{intrinsics, LaneCount, Simd, SimdElement, SimdPartialEq, SupportedLaneCount};
	use core::cmp::Ordering;
	use core::{fmt, mem};

	mod sealed {
	use super::*;

	/// Not only does this seal the `MaskElement` trait, but these functions prevent other traits
	/// from bleeding into the parent bounds.
	///
	/// For example, `eq` could be provided by requiring `MaskElement: PartialEq`, but that would
	/// prevent us from ever removing that bound, or from implementing `MaskElement` on
	/// non-`PartialEq` types in the future.
	pub trait Sealed {
	fn valid<const LANES: usize>(values: Simd<Self, LANES>) -> bool
	where
	LaneCount<LANES>: SupportedLaneCount,
	Self: SimdElement;

	fn eq(self, other: Self) -> bool;

	const TRUE: Self;

	const FALSE: Self;
	}
	}
	use sealed::Sealed;

	/// Marker trait for types that may be used as SIMD mask elements.
	///
	/// # Safety
	/// Type must be a signed integer.
	pub unsafe trait MaskElement: SimdElement + Sealed {}

	macro_rules! impl_element {
	{ $ty:ty } => {
	impl Sealed for $ty {
	fn valid<const LANES: usize>(value: Simd<Self, LANES>) -> bool
	where
	LaneCount<LANES>: SupportedLaneCount,
	{
	(value.simd_eq(Simd::splat(0 as _)) \| value.simd_eq(Simd::splat(-1 as _))).all()
	}

	fn eq(self, other: Self) -> bool { self == other }

	const TRUE: Self = -1;
	const FALSE: Self = 0;
	}

	// Safety: this is a valid mask element type
	unsafe impl MaskElement for $ty {}
	}
	}

	impl_element! { i8 }
	impl_element! { i16 }
	impl_element! { i32 }
	impl_element! { i64 }
	impl_element! { isize }

	/// A SIMD vector mask for `LANES` elements of width specified by `Element`.
	///
	/// Masks represent boolean inclusion/exclusion on a per-lane basis.
	///
	/// The layout of this type is unspecified.
	#[repr(transparent)]
	pub struct Mask<T, const LANES: usize>(mask_impl::Mask<T, LANES>)
	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> Mask<T, LANES>
	where
	T: MaskElement,
	LaneCount<LANES>: SupportedLaneCount,
	{
	/// Construct a mask by setting all lanes to the given value.
	pub fn splat(value: bool) -> Self {
	Self(mask_impl::Mask::splat(value))
	}

	/// Converts an array of bools to a SIMD mask.
	pub fn from_array(array: [bool; LANES]) -> Self {
	// SAFETY: Rust's bool has a layout of 1 byte (u8) with a value of
	// true: 0b_0000_0001
	// false: 0b_0000_0000
	// Thus, an array of bools is also a valid array of bytes: [u8; N]
	// This would be hypothetically valid as an "in-place" transmute,
	// but these are "dependently-sized" types, so copy elision it is!
	unsafe {
	let bytes: [u8; LANES] = mem::transmute_copy(&array);
	let bools: Simd<i8, LANES> =
	intrinsics::simd_ne(Simd::from_array(bytes), Simd::splat(0u8));
	Mask::from_int_unchecked(intrinsics::simd_cast(bools))
	}
	}

	/// Converts a SIMD mask to an array of bools.
	pub fn to_array(self) -> [bool; LANES] {
	// This follows mostly the same logic as from_array.
	// SAFETY: Rust's bool has a layout of 1 byte (u8) with a value of
	// true: 0b_0000_0001
	// false: 0b_0000_0000
	// Thus, an array of bools is also a valid array of bytes: [u8; N]
	// Since our masks are equal to integers where all bits are set,
	// we can simply convert them to i8s, and then bitand them by the
	// bitpattern for Rust's "true" bool.
	// This would be hypothetically valid as an "in-place" transmute,
	// but these are "dependently-sized" types, so copy elision it is!
	unsafe {
	let mut bytes: Simd<i8, LANES> = intrinsics::simd_cast(self.to_int());
	bytes &= Simd::splat(1i8);
	mem::transmute_copy(&bytes)
	}
	}

	/// Converts a vector of integers to a mask, where 0 represents `false` and -1
	/// represents `true`.
	///
	/// # Safety
	/// All lanes must be either 0 or -1.
	#[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 {
	// Safety: the caller must confirm this invariant
	unsafe { Self(mask_impl::Mask::from_int_unchecked(value)) }
	}

	/// Converts a vector of integers to a mask, where 0 represents `false` and -1
	/// represents `true`.
	///
	/// # Panics
	/// Panics if any lane is not 0 or -1.
	#[inline]
	#[must_use = "method returns a new mask and does not mutate the original value"]
	pub fn from_int(value: Simd<T, LANES>) -> Self {
	assert!(T::valid(value), "all values must be either 0 or -1",);
	// Safety: the validity has been checked
	unsafe { Self::from_int_unchecked(value) }
	}

	/// Converts the mask to a vector of integers, where 0 represents `false` and -1
	/// represents `true`.
	#[inline]
	#[must_use = "method returns a new vector and does not mutate the original value"]
	pub fn to_int(self) -> Simd<T, LANES> {
	self.0.to_int()
	}

	/// Converts the mask to a mask of any other lane size.
	#[inline]
	#[must_use = "method returns a new mask and does not mutate the original value"]
	pub fn cast<U: MaskElement>(self) -> Mask<U, LANES> {
	Mask(self.0.convert())
	}

	/// Tests the value of the specified lane.
	///
	/// # Safety
	/// `lane` must be less than `LANES`.
	#[inline]
	#[must_use = "method returns a new bool and does not mutate the original value"]
	pub unsafe fn test_unchecked(&self, lane: usize) -> bool {
	// Safety: the caller must confirm this invariant
	unsafe { self.0.test_unchecked(lane) }
	}

	/// Tests the value of the specified lane.
	///
	/// # Panics
	/// Panics if `lane` is greater than or equal to the number of lanes in the vector.
	#[inline]
	#[must_use = "method returns a new bool and does not mutate the original value"]
	pub fn test(&self, lane: usize) -> bool {
	assert!(lane < LANES, "lane index out of range");
	// Safety: the lane index has been checked
	unsafe { self.test_unchecked(lane) }
	}

	/// Sets the value of the specified lane.
	///
	/// # Safety
	/// `lane` must be less than `LANES`.
	#[inline]
	pub unsafe fn set_unchecked(&mut self, lane: usize, value: bool) {
	// Safety: the caller must confirm this invariant
	unsafe {
	self.0.set_unchecked(lane, value);
	}
	}

	/// Sets the value of the specified lane.
	///
	/// # Panics
	/// Panics if `lane` is greater than or equal to the number of lanes in the vector.
	#[inline]
	pub fn set(&mut self, lane: usize, value: bool) {
	assert!(lane < LANES, "lane index out of range");
	// Safety: the lane index has been checked
	unsafe {
	self.set_unchecked(lane, value);
	}
	}

	/// Returns true if any lane is set, or false otherwise.
	#[inline]
	#[must_use = "method returns a new bool and does not mutate the original value"]
	pub fn any(self) -> bool {
	self.0.any()
	}

	/// Returns true if all lanes are set, or false otherwise.
	#[inline]
	#[must_use = "method returns a new bool and does not mutate the original value"]
	pub fn all(self) -> bool {
	self.0.all()
	}
	}

	// vector/array conversion
	impl<T, const LANES: usize> From<[bool; LANES]> for Mask<T, LANES>
	where
	T: MaskElement,
	LaneCount<LANES>: SupportedLaneCount,
	{
	fn from(array: [bool; LANES]) -> Self {
	Self::from_array(array)
	}
	}

	impl<T, const LANES: usize> From<Mask<T, LANES>> for [bool; LANES]
	where
	T: MaskElement,
	LaneCount<LANES>: SupportedLaneCount,
	{
	fn from(vector: Mask<T, LANES>) -> Self {
	vector.to_array()
	}
	}

	impl<T, const LANES: usize> Default for Mask<T, LANES>
	where
	T: MaskElement,
	LaneCount<LANES>: SupportedLaneCount,
	{
	#[inline]
	#[must_use = "method returns a defaulted mask with all lanes set to false (0)"]
	fn default() -> Self {
	Self::splat(false)
	}
	}

	impl<T, const LANES: usize> PartialEq for Mask<T, LANES>
	where
	T: MaskElement + PartialEq,
	LaneCount<LANES>: SupportedLaneCount,
	{
	#[inline]
	#[must_use = "method returns a new bool and does not mutate the original value"]
	fn eq(&self, other: &Self) -> bool {
	self.0 == other.0
	}
	}

	impl<T, const LANES: usize> PartialOrd for Mask<T, LANES>
	where
	T: MaskElement + PartialOrd,
	LaneCount<LANES>: SupportedLaneCount,
	{
	#[inline]
	#[must_use = "method returns a new Ordering and does not mutate the original value"]
	fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
	self.0.partial_cmp(&other.0)
	}
	}

	impl<T, const LANES: usize> fmt::Debug for Mask<T, LANES>
	where
	T: MaskElement + fmt::Debug,
	LaneCount<LANES>: SupportedLaneCount,
	{
	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
	f.debug_list()
	.entries((0..LANES).map(\|lane\| self.test(lane)))
	.finish()
	}
	}

	impl<T, const LANES: usize> core::ops::BitAnd 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 bitand(self, rhs: Self) -> Self {
	Self(self.0 & rhs.0)
	}
	}

	impl<T, const LANES: usize> core::ops::BitAnd<bool> 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 bitand(self, rhs: bool) -> Self {
	self & Self::splat(rhs)
	}
	}

	impl<T, const LANES: usize> core::ops::BitAnd<Mask<T, LANES>> for bool
	where
	T: MaskElement,
	LaneCount<LANES>: SupportedLaneCount,
	{
	type Output = Mask<T, LANES>;
	#[inline]
	#[must_use = "method returns a new mask and does not mutate the original value"]
	fn bitand(self, rhs: Mask<T, LANES>) -> Mask<T, LANES> {
	Mask::splat(self) & rhs
	}
	}

	impl<T, const LANES: usize> core::ops::BitOr 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 bitor(self, rhs: Self) -> Self {
	Self(self.0 \| rhs.0)
	}
	}

	impl<T, const LANES: usize> core::ops::BitOr<bool> 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 bitor(self, rhs: bool) -> Self {
	self \| Self::splat(rhs)
	}
	}

	impl<T, const LANES: usize> core::ops::BitOr<Mask<T, LANES>> for bool
	where
	T: MaskElement,
	LaneCount<LANES>: SupportedLaneCount,
	{
	type Output = Mask<T, LANES>;
	#[inline]
	#[must_use = "method returns a new mask and does not mutate the original value"]
	fn bitor(self, rhs: Mask<T, LANES>) -> Mask<T, LANES> {
	Mask::splat(self) \| rhs
	}
	}

	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(self, rhs: Self) -> Self::Output {
	Self(self.0 ^ rhs.0)
	}
	}

	impl<T, const LANES: usize> core::ops::BitXor<bool> 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(self, rhs: bool) -> Self::Output {
	self ^ Self::splat(rhs)
	}
	}

	impl<T, const LANES: usize> core::ops::BitXor<Mask<T, LANES>> for bool
	where
	T: MaskElement,
	LaneCount<LANES>: SupportedLaneCount,
	{
	type Output = Mask<T, LANES>;
	#[inline]
	#[must_use = "method returns a new mask and does not mutate the original value"]
	fn bitxor(self, rhs: Mask<T, LANES>) -> Self::Output {
	Mask::splat(self) ^ rhs
	}
	}

	impl<T, const LANES: usize> core::ops::Not for Mask<T, LANES>
	where
	T: MaskElement,
	LaneCount<LANES>: SupportedLaneCount,
	{
	type Output = Mask<T, LANES>;
	#[inline]
	#[must_use = "method returns a new mask and does not mutate the original value"]
	fn not(self) -> Self::Output {
	Self(!self.0)
	}
	}

	impl<T, const LANES: usize> core::ops::BitAndAssign for Mask<T, LANES>
	where
	T: MaskElement,
	LaneCount<LANES>: SupportedLaneCount,
	{
	#[inline]
	fn bitand_assign(&mut self, rhs: Self) {
	self.0 = self.0 & rhs.0;
	}
	}

	impl<T, const LANES: usize> core::ops::BitAndAssign<bool> for Mask<T, LANES>
	where
	T: MaskElement,
	LaneCount<LANES>: SupportedLaneCount,
	{
	#[inline]
	fn bitand_assign(&mut self, rhs: bool) {
	*self &= Self::splat(rhs);
	}
	}

	impl<T, const LANES: usize> core::ops::BitOrAssign for Mask<T, LANES>
	where
	T: MaskElement,
	LaneCount<LANES>: SupportedLaneCount,
	{
	#[inline]
	fn bitor_assign(&mut self, rhs: Self) {
	self.0 = self.0 \| rhs.0;
	}
	}

	impl<T, const LANES: usize> core::ops::BitOrAssign<bool> for Mask<T, LANES>
	where
	T: MaskElement,
	LaneCount<LANES>: SupportedLaneCount,
	{
	#[inline]
	fn bitor_assign(&mut self, rhs: bool) {
	*self \|= Self::splat(rhs);
	}
	}

	impl<T, const LANES: usize> core::ops::BitXorAssign for Mask<T, LANES>
	where
	T: MaskElement,
	LaneCount<LANES>: SupportedLaneCount,
	{
	#[inline]
	fn bitxor_assign(&mut self, rhs: Self) {
	self.0 = self.0 ^ rhs.0;
	}
	}

	impl<T, const LANES: usize> core::ops::BitXorAssign<bool> for Mask<T, LANES>
	where
	T: MaskElement,
	LaneCount<LANES>: SupportedLaneCount,
	{
	#[inline]
	fn bitxor_assign(&mut self, rhs: bool) {
	*self ^= Self::splat(rhs);
	}
	}

	/// A mask for SIMD vectors with eight elements of 8 bits.
	pub type mask8x8 = Mask<i8, 8>;

	/// A mask for SIMD vectors with 16 elements of 8 bits.
	pub type mask8x16 = Mask<i8, 16>;

	/// A mask for SIMD vectors with 32 elements of 8 bits.
	pub type mask8x32 = Mask<i8, 32>;

	/// A mask for SIMD vectors with 64 elements of 8 bits.
	pub type mask8x64 = Mask<i8, 64>;

	/// A mask for SIMD vectors with four elements of 16 bits.
	pub type mask16x4 = Mask<i16, 4>;

	/// A mask for SIMD vectors with eight elements of 16 bits.
	pub type mask16x8 = Mask<i16, 8>;

	/// A mask for SIMD vectors with 16 elements of 16 bits.
	pub type mask16x16 = Mask<i16, 16>;

	/// A mask for SIMD vectors with 32 elements of 16 bits.
	pub type mask16x32 = Mask<i16, 32>;

	/// A mask for SIMD vectors with two elements of 32 bits.
	pub type mask32x2 = Mask<i32, 2>;

	/// A mask for SIMD vectors with four elements of 32 bits.
	pub type mask32x4 = Mask<i32, 4>;

	/// A mask for SIMD vectors with eight elements of 32 bits.
	pub type mask32x8 = Mask<i32, 8>;

	/// A mask for SIMD vectors with 16 elements of 32 bits.
	pub type mask32x16 = Mask<i32, 16>;

	/// A mask for SIMD vectors with two elements of 64 bits.
	pub type mask64x2 = Mask<i64, 2>;

	/// A mask for SIMD vectors with four elements of 64 bits.
	pub type mask64x4 = Mask<i64, 4>;

	/// A mask for SIMD vectors with eight elements of 64 bits.
	pub type mask64x8 = Mask<i64, 8>;

	/// A mask for SIMD vectors with two elements of pointer width.
	pub type masksizex2 = Mask<isize, 2>;

	/// A mask for SIMD vectors with four elements of pointer width.
	pub type masksizex4 = Mask<isize, 4>;

	/// A mask for SIMD vectors with eight elements of pointer width.
	pub type masksizex8 = Mask<isize, 8>;

	macro_rules! impl_from {
	{ $from:ty => $($to:ty),* } => {
	$(
	impl<const LANES: usize> From<Mask<$from, LANES>> for Mask<$to, LANES>
	where
	LaneCount<LANES>: SupportedLaneCount,
	{
	fn from(value: Mask<$from, LANES>) -> Self {
	value.cast()
	}
	}
	)*
	}
	}
	impl_from! { i8 => i16, i32, i64, isize }
	impl_from! { i16 => i32, i64, isize, i8 }
	impl_from! { i32 => i64, isize, i8, i16 }
	impl_from! { i64 => isize, i8, i16, i32 }
	impl_from! { isize => i8, i16, i32, i64 }