[libc-commits] [libc] [libc] Cache the most recently used slot for a chunk size (PR #149751)

[Shilei Tian via libc-commits]

================
@@ -123,6 +112,16 @@ static inline uint32_t get_chunk_size(uint32_t x) {
   return (s3 + MIN_ALIGNMENT) & ~MIN_ALIGNMENT;
 }
 
+// Converts a chunk size into an index suitable for a statically sized array.
+static inline constexpr uint32_t get_chunk_id(uint32_t x) {
+  uint32_t y = x >> 4;
+  if (x <= MIN_SIZE)
+    return 0;
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shiltian wrote:

```suggestion
  if (x <= MIN_SIZE)
    return 0;
  uint32_t y = x >> 4;
```

https://github.com/llvm/llvm-project/pull/149751