Clear ChunkedBitSet without reallocating

Zalathar · Zalathar · commit 279a5b3917bf · 2025-10-13T12:56:34.000+11:00
diff --git a/compiler/rustc_index/src/bit_set.rs b/compiler/rustc_index/src/bit_set.rs
@@ -585,8 +585,7 @@ impl<T: Idx> ChunkedBitSet<T> {
     }
 
     pub fn clear(&mut self) {
-        let domain_size = self.domain_size();
-        *self = ChunkedBitSet::new_empty(domain_size);
+        self.chunks.fill_with(|| Chunk::Zeros);
     }
 
     #[cfg(test)]

Original file line number	Diff line number	Diff line change
`@@ -585,8 +585,7 @@ impl<T: Idx> ChunkedBitSet<T> {`
`585`	`585`	`}`
`586`	`586`
`587`	`587`	`pub fn clear(&mut self) {`
`588`		`- let domain_size = self.domain_size();`
`589`		`- *self = ChunkedBitSet::new_empty(domain_size);`
	`588`	`+ self.chunks.fill_with(\|\| Chunk::Zeros);`
`590`	`589`	`}`
`591`	`590`
`592`	`591`	`#[cfg(test)]`