From 04be4cf73e94ac42b7babc17bef2c166a5e6bdad Mon Sep 17 00:00:00 2001
From: janis <janis@nirgendwo.xyz>
Date: Tue, 11 Aug 2026 13:01:31 +0200
Subject: [PATCH] foundation: is_aligned

---
 crates/foundation/src/alloc/slab.rs | 2 +-
 crates/foundation/src/lib.rs        | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/crates/foundation/src/alloc/slab.rs b/crates/foundation/src/alloc/slab.rs
index 556962e..7ea28e1 100644
--- a/crates/foundation/src/alloc/slab.rs
+++ b/crates/foundation/src/alloc/slab.rs
@@ -251,12 +251,12 @@ impl<A: Allocator + Clone> Slab<A> {
 
         let addr =
             unsafe { NonZero::new_unchecked(mem::align_down(slot.addr().get(), layout.align())) };
+        let chunk_ptr: NonNull<SlabChunk<A>> = slot.with_addr(addr).cast();
 
         // grab provenance exposed in alloc_chunk, since `slot` may be noalias restricted to its layout.
 
         // let chunk_ptr: NonNull<SlabChunk<A>> = NonNull::with_exposed_provenance(addr);
 
-        let chunk_ptr: NonNull<SlabChunk<A>> = slot.with_addr(addr).cast();
 
         #[cfg(test)]
         std::eprintln!("Slab::free_slot(chunk: {chunk_ptr:#?})");
diff --git a/crates/foundation/src/lib.rs b/crates/foundation/src/lib.rs
index cb26317..0c83b70 100644
--- a/crates/foundation/src/lib.rs
+++ b/crates/foundation/src/lib.rs
@@ -43,6 +43,10 @@ pub mod mem {
         value & !(alignment - T::one())
     }
 
+    pub fn is_aligned<T: PrimInt>(value: T, alignment: T) -> bool {
+        value & (alignment - T::one()) == T::zero()
+    }
+
     /// # Safety
     pub unsafe fn volatile_copy<T: Sized>(src: *const T, dst: *mut T, count: usize) {
         unsafe {