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Add link to closed PR for future optimizers of ChunkedBitSet relations #94709

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Mar 8, 2022
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Add link to closed PR for future optimizers of ChunkedBitSet relations #94709

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12 changes: 8 additions & 4 deletions compiler/rustc_index/src/bit_set.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -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
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tiny typo here and below

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// If a a faster implementation of this operation is required, consider
// If a faster implementation of this operation is required, consider

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Ah, that's stupid, thanks for catching it! Fixes in #94956

// 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())
}
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