| 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> {} |
| |
| macro_rules! supported_lane_count { |
| ($($lanes:literal),+) => { |
| $( |
| impl SupportedLaneCount for LaneCount<$lanes> { |
| type BitMask = [u8; ($lanes + 7) / 8]; |
| } |
| )+ |
| }; |
| } |
| |
| supported_lane_count!(1, 2, 4, 8, 16, 32, 64); |
| #[cfg(feature = "all_lane_counts")] |
| supported_lane_count!( |
| 3, 5, 6, 7, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, |
| 31, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, |
| 56, 57, 58, 59, 60, 61, 62, 63 |
| ); |