diff options
| -rw-r--r-- | src/libcore/slice/mod.rs | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/src/libcore/slice/mod.rs b/src/libcore/slice/mod.rs index 244bf476caf..aacbbd5058e 100644 --- a/src/libcore/slice/mod.rs +++ b/src/libcore/slice/mod.rs @@ -1245,7 +1245,8 @@ macro_rules! iterator { P: FnMut(Self::Item) -> bool, { // The addition might panic on overflow - let n = self.len(); + // Use the len of the slice to hint optimizer to remove result index bounds check. + let n = make_slice!(self.ptr, self.end).len(); self.try_fold(0, move |i, x| { if predicate(x) { Err(i) } else { Ok(i + 1) } @@ -1263,7 +1264,8 @@ macro_rules! iterator { { // No need for an overflow check here, because `ExactSizeIterator` // implies that the number of elements fits into a `usize`. - let n = self.len(); + // Use the len of the slice to hint optimizer to remove result index bounds check. + let n = make_slice!(self.ptr, self.end).len(); self.try_rfold(n, move |i, x| { let i = i - 1; if predicate(x) { Err(i) } |