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mod sealed {
pub trait Sealed {}
}
use sealed::Sealed;
/// Specifies the number of lanes in a SIMD vector as a type.
pub struct LaneCount<const LANES: usize>;
impl<const LANES: usize> LaneCount<LANES> {
/// The number of bytes in a bitmask with this many lanes.
pub const BITMASK_LEN: usize = (LANES + 7) / 8;
}
/// Statically guarantees that a lane count is marked as supported.
///
/// This trait is *sealed*: the list of implementors below is total.
/// Users do not have the ability to mark additional `LaneCount<N>` values as supported.
/// Only SIMD vectors with supported lane counts are constructable.
pub trait SupportedLaneCount: Sealed {
#[doc(hidden)]
type BitMask: Copy + Default + AsRef<[u8]> + AsMut<[u8]>;
}
impl<const LANES: usize> Sealed for LaneCount<LANES> {}
impl SupportedLaneCount for LaneCount<1> {
type BitMask = [u8; 1];
}
impl SupportedLaneCount for LaneCount<2> {
type BitMask = [u8; 1];
}
impl SupportedLaneCount for LaneCount<4> {
type BitMask = [u8; 1];
}
impl SupportedLaneCount for LaneCount<8> {
type BitMask = [u8; 1];
}
impl SupportedLaneCount for LaneCount<16> {
type BitMask = [u8; 2];
}
impl SupportedLaneCount for LaneCount<32> {
type BitMask = [u8; 4];
}
impl SupportedLaneCount for LaneCount<64> {
type BitMask = [u8; 8];
}
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