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Mark slice::reverse unstably const

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This commit is contained in:
okaneco 2025-01-04 06:47:31 -05:00
parent 49761b073c
commit 03c2ac248f
1 changed files with 5 additions and 3 deletions
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8
library/core/src/slice/mod.rs
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@ -987,8 +987,9 @@ impl<T> [T] {
/// assert!(v == [3, 2, 1]); /// assert!(v == [3, 2, 1]);
/// ``` /// ```
#[stable(feature = "rust1", since = "1.0.0")] #[stable(feature = "rust1", since = "1.0.0")]
#[rustc_const_unstable(feature = "const_slice_reverse", issue = "135120")]
#[inline] #[inline]
pub fn reverse(&mut self) { pub const fn reverse(&mut self) {
let half_len = self.len() / 2; let half_len = self.len() / 2;
let Range { start, end } = self.as_mut_ptr_range(); let Range { start, end } = self.as_mut_ptr_range();
@ -1011,7 +1012,7 @@ impl<T> [T] {
revswap(front_half, back_half, half_len); revswap(front_half, back_half, half_len);
#[inline] #[inline]
fn revswap<T>(a: &mut [T], b: &mut [T], n: usize) { const fn revswap<T>(a: &mut [T], b: &mut [T], n: usize) {
debug_assert!(a.len() == n); debug_assert!(a.len() == n);
debug_assert!(b.len() == n); debug_assert!(b.len() == n);
@ -1019,7 +1020,8 @@ impl<T> [T] {
// this check tells LLVM that the indexing below is // this check tells LLVM that the indexing below is
// in-bounds. Then after inlining -- once the actual // in-bounds. Then after inlining -- once the actual
// lengths of the slices are known -- it's removed. // lengths of the slices are known -- it's removed.
let (a, b) = (&mut a[..n], &mut b[..n]); let (a, _) = a.split_at_mut(n);
let (b, _) = b.split_at_mut(n);
let mut i = 0; let mut i = 0;
while i < n { while i < n {