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Clarify _mm256_shuffle_epi8 documentation #990

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Jan 30, 2021
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Clarify _mm256_shuffle_epi8 documentation #990

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7 changes: 3 additions & 4 deletions crates/core_arch/src/x86/avx2.rs
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Expand Up @@ -2587,14 +2587,13 @@ pub unsafe fn _mm256_sad_epu8(a: __m256i, b: __m256i) -> __m256i {

/// Shuffles bytes from `a` according to the content of `b`.
///
/// The last 4 bits of each byte of `b` are used as addresses into the 32 bytes
/// of `a`.
/// For each of the 128-bit low and high halves of the vectors, the last
/// 4 bits of each byte of `b` are used as addresses into the respective
/// low or high 16 bytes of `a`. That is, the halves are shuffled separately.
///
/// In addition, if the highest significant bit of a byte of `b` is set, the
/// respective destination byte is set to 0.
///
/// The low and high halves of the vectors are shuffled separately.
///
/// Picturing `a` and `b` as `[u8; 32]`, `_mm256_shuffle_epi8` is logically
/// equivalent to:
///
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