diff options
| -rw-r--r-- | src/grid/storage.rs | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/grid/storage.rs b/src/grid/storage.rs index d517fa01..9a56872e 100644 --- a/src/grid/storage.rs +++ b/src/grid/storage.rs @@ -174,6 +174,14 @@ impl<T> Storage<T> { /// Compute actual index in underlying storage given the requested index. fn compute_index(&self, requested: usize) -> usize { + use ::std::hint::unreachable_unchecked; + + // This prevents an extra branch being inserted which checks for the + // divisor to be zero thus making a % b generate equivalent code as in C + if self.inner.len() == 0 { + unsafe { unreachable_unchecked(); } + } + (requested + self.zero) % self.inner.len() } |