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Document alternatives to Mask<T, LANES> that guarantee layout. Fixes #332 #333

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Document alternatives to Mask<T, LANES> that guarantee layout. Fixes #332 #333

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Document alternatives to Mask<T, LANES> that guarantee layout.
reinerp Mar 8, 2023
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s/layout/size. Mention BitMaskArray.
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4 changes: 4 additions & 0 deletions crates/core_simd/src/masks.rs
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Expand Up @@ -88,6 +88,10 @@ impl_element! { isize }
/// The layout of this type is unspecified, and may change between platforms
/// and/or Rust versions, and code should not assume that it is equivalent to
/// `[T; LANES]`.
///
/// For a type with layout guaranteed equivalent to `[T; LANES]`, use
/// `Simd<T, LANES>`. For a type with layout guaranteed to use 1 bit per
/// lane (padded up to full bytes), use `LANES::BitMask`.
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The type is actually ToBitMask::BitMask: https://doc.rust-lang.org/std/simd/trait.ToBitMask.html#associatedtype.BitMask. It's not padded up to the next byte, but the next integer.

#[repr(transparent)]
pub struct Mask<T, const LANES: usize>(mask_impl::Mask<T, LANES>)
where
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