diff options
Diffstat (limited to 'library/core/src/alloc/layout.rs')
| -rw-r--r-- | library/core/src/alloc/layout.rs | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/library/core/src/alloc/layout.rs b/library/core/src/alloc/layout.rs index 65946e09ff9..9ef0a7d7608 100644 --- a/library/core/src/alloc/layout.rs +++ b/library/core/src/alloc/layout.rs @@ -450,7 +450,11 @@ impl Layout { return Err(LayoutError); } - let array_size = element_size * n; + // SAFETY: We just checked that we won't overflow `usize` when we multiply. + // This is a useless hint inside this function, but after inlining this helps + // deduplicate checks for whether the overall capacity is zero (e.g., in RawVec's + // allocation path) before/after this multiplication. + let array_size = unsafe { element_size.unchecked_mul(n) }; // SAFETY: We just checked above that the `array_size` will not // exceed `isize::MAX` even when rounded up to the alignment. |