[libc-commits] [libc] [libc] Add aligned_alloc (PR #96586)

[Nick Desaulniers via libc-commits]

================
@@ -357,6 +392,58 @@ void Block<OffsetType, kAlign>::free(Block *&block) {
   merge_next(block);
 }
 
+template <typename OffsetType, size_t kAlign>
+bool Block<OffsetType, kAlign>::can_allocate(size_t alignment,
+                                             size_t size) const {
+  if (usable_space_is_aligned(alignment) && inner_size() >= size)
+    return true; // Size and alignment constraints met.
+
+  // Either the alignment isn't met or we don't have enough size.
+  // If we don't meet alignment, we can always adjust such that we do meet the
+  // alignment. If we meet the alignment but just don't have enough size. This
+  // check will fail anyway.
+  size_t adjustment = extra_space_for_adjustment(alignment);
+  if (inner_size() >= size + adjustment)
+    return true;
+
+  return false;
----------------
nickdesaulniers wrote:

```suggestion
  return inner_size() >= size + extra_space_for_adjustment(alignment);
```

https://github.com/llvm/llvm-project/pull/96586