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miri being difficult on purpose to ensure we dont take shortcuts

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Robin Appelman 2021-07-27 17:07:04 +02:00
commit 9d04fbe7cf
1 changed files with 5 additions and 15 deletions
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20
src/num_traits.rs
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@ -293,23 +293,13 @@ macro_rules! impl_into_bytes {
#[inline(always)]
fn into_u16(self) -> Self::U16Iter {
use std::convert::TryInto;
use std::mem::align_of;
let bytes = self.to_le_bytes();
if align_of::<Self>() >= align_of::<u16>() {
let (head, aligned, tail) = unsafe { bytes[..].align_to::<u16>() };
debug_assert_eq!(0, head.len());
debug_assert_eq!(0, tail.len());
Self::U16Iter::new(aligned.try_into().unwrap())
} else {
let mut shorts = [0; $shorts];
let mut chunks = bytes.chunks(2).zip(shorts.iter_mut());
while let Some((&[a, b], short)) = chunks.next() {
*short = (b as u16) << 8 | a as u16;
}
Self::U16Iter::new(shorts)
let mut shorts = [0; $shorts];
let mut chunks = bytes.chunks(2).zip(shorts.iter_mut());
while let Some((&[a, b], short)) = chunks.next() {
*short = (b as u16) << 8 | a as u16;
}
Self::U16Iter::new(shorts)
}
}
};