nordic-dev.net/rust
nordic-dev.net/rust
2
0
Fork 0
mirror of https://github.com/rust-lang/rust.git synced 2024-11-21 22:34:05 +00:00
Code Issues Packages Projects Releases Wiki Activity

Add comment linking to closed PR for future optimizers

Browse Source 
While optimizing these operations proved unfruitful w.r.t. improving
compiler performance right now, faster versions might be needed at a
later time.
This commit is contained in:
Martin Gammelsæter 2022-03-07 19:06:42 +01:00
parent 297273c45b
commit 4d38f15ede
1 changed files with 8 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
compiler/rustc_index/src/bit_set.rs
View File

@ -654,15 +654,19 @@ impl<T: Idx> BitRelations<ChunkedBitSet<T>> for ChunkedBitSet<T> {
impl<T: Idx> BitRelations<HybridBitSet<T>> for ChunkedBitSet<T> {
fn union(&mut self, other: &HybridBitSet<T>) -> bool {
// FIXME: this is slow if `other` is dense, and could easily be
// improved, but it hasn't been a problem in practice so far.
// FIXME: This is slow if `other` is dense, but it hasn't been a problem
// in practice so far.
// If a a faster implementation of this operation is required, consider
// reopening https://github.com/rust-lang/rust/pull/94625
assert_eq!(self.domain_size, other.domain_size());
sequential_update(|elem| self.insert(elem), other.iter())
}
fn subtract(&mut self, other: &HybridBitSet<T>) -> bool {
// FIXME: this is slow if `other` is dense, and could easily be
// improved, but it hasn't been a problem in practice so far.
// FIXME: This is slow if `other` is dense, but it hasn't been a problem
// in practice so far.
// If a a faster implementation of this operation is required, consider
// reopening https://github.com/rust-lang/rust/pull/94625
assert_eq!(self.domain_size, other.domain_size());
sequential_update(|elem| self.remove(elem), other.iter())
}