Function contains_non_continuation_byte

crates/wtf8/src/core_str_count.rs:98–101

(w: usize)

// true)
#[inline]
fn contains_non_continuation_byte(w: usize) -> usize {
    const LSB: usize = usize_repeat_u8(0x01);
    ((!w >> 7) | (w >> 6)) & LSB
}

// Morally equivalent to `values.to_ne_bytes().into_iter().sum::<usize>()`, but
// more efficient.