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Remove BitRelations impls for SparseBitSet, add optimizations

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This commit is contained in:
Will Crichton 2021-08-25 15:03:09 -07:00
parent 6cf3786ba4
commit 415d5e860f
1 changed files with 29 additions and 63 deletions
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92
compiler/rustc_index/src/bit_set.rs
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@ -262,79 +262,42 @@ fn sparse_intersect<T: Idx>(
set: &mut SparseBitSet<T>,
other_contains: impl Fn(&T) -> bool,
) -> bool {
let mut changed = false;
for i in (0..set.len()).rev() {
if !other_contains(&set.elems[i]) {
set.elems.remove(i);
changed = true;
}
}
changed
let size = set.elems.len();
set.elems.retain(|elem| other_contains(elem));
set.elems.len() != size
}
impl<T: Idx> BitRelations<SparseBitSet<T>> for BitSet<T> {
fn union(&mut self, other: &SparseBitSet<T>) -> bool {
sequential_update(|elem| self.insert(elem), other.iter().cloned())
}
fn subtract(&mut self, other: &SparseBitSet<T>) -> bool {
sequential_update(|elem| self.remove(elem), other.iter().cloned())
}
fn intersect(&mut self, other: &SparseBitSet<T>) -> bool {
self.intersect(&other.to_dense())
}
}
impl<T: Idx> BitRelations<BitSet<T>> for SparseBitSet<T> {
fn union(&mut self, other: &BitSet<T>) -> bool {
sequential_update(|elem| self.insert(elem), other.iter())
}
fn subtract(&mut self, other: &BitSet<T>) -> bool {
sequential_update(|elem| self.remove(elem), other.iter())
}
fn intersect(&mut self, other: &BitSet<T>) -> bool {
sparse_intersect(self, |el| other.contains(*el))
}
}
impl<T: Idx> BitRelations<SparseBitSet<T>> for SparseBitSet<T> {
fn union(&mut self, other: &SparseBitSet<T>) -> bool {
sequential_update(|elem| self.insert(elem), other.iter().cloned())
}
fn subtract(&mut self, other: &SparseBitSet<T>) -> bool {
sequential_update(|elem| self.insert(elem), other.iter().cloned())
}
fn intersect(&mut self, other: &SparseBitSet<T>) -> bool {
sparse_intersect(self, |el| other.contains(*el))
}
}
impl<T: Idx, S> BitRelations<HybridBitSet<T>> for S
where
S: BitRelations<BitSet<T>> + BitRelations<SparseBitSet<T>>,
{
impl<T: Idx> BitRelations<HybridBitSet<T>> for BitSet<T> {
fn union(&mut self, other: &HybridBitSet<T>) -> bool {
assert_eq!(self.domain_size, other.domain_size());
match other {
HybridBitSet::Sparse(sparse) => self.union(sparse),
HybridBitSet::Sparse(sparse) => {
sequential_update(|elem| self.insert(elem), sparse.iter().cloned())
}
HybridBitSet::Dense(dense) => self.union(dense),
}
}
fn subtract(&mut self, other: &HybridBitSet<T>) -> bool {
assert_eq!(self.domain_size, other.domain_size());
match other {
HybridBitSet::Sparse(sparse) => self.subtract(sparse),
HybridBitSet::Sparse(sparse) => {
sequential_update(|elem| self.remove(elem), sparse.iter().cloned())
}
HybridBitSet::Dense(dense) => self.subtract(dense),
}
}
fn intersect(&mut self, other: &HybridBitSet<T>) -> bool {
assert_eq!(self.domain_size, other.domain_size());
match other {
HybridBitSet::Sparse(sparse) => self.intersect(sparse),
HybridBitSet::Sparse(sparse) => {
let n = self.count();
let mut sparse_copy = sparse.clone();
sparse_intersect(&mut sparse_copy, |el| !self.contains(*el));
*self = sparse_copy.to_dense();
self.count() != n
}
HybridBitSet::Dense(dense) => self.intersect(dense),
}
}
@ -342,6 +305,7 @@ where
impl<T: Idx> BitRelations<HybridBitSet<T>> for HybridBitSet<T> {
fn union(&mut self, other: &HybridBitSet<T>) -> bool {
assert_eq!(self.domain_size(), other.domain_size());
match self {
HybridBitSet::Sparse(self_sparse) => {
match other {
@ -385,20 +349,22 @@ impl<T: Idx> BitRelations<HybridBitSet<T>> for HybridBitSet<T> {
}
fn subtract(&mut self, other: &HybridBitSet<T>) -> bool {
// FIXME(willcrichton): should there be an optimized sparse / dense version?
assert_eq!(self.domain_size(), other.domain_size());
match self {
HybridBitSet::Sparse(self_sparse) => self_sparse.subtract(other),
HybridBitSet::Sparse(self_sparse) => {
sequential_update(|elem| self_sparse.remove(elem), other.iter())
}
HybridBitSet::Dense(self_dense) => self_dense.subtract(other),
}
}
fn intersect(&mut self, other: &HybridBitSet<T>) -> bool {
// FIXME(willcrichton): should there be an optimized sparse / dense version?
assert_eq!(self.domain_size(), other.domain_size());
match self {
HybridBitSet::Sparse(self_sparse) => self_sparse.intersect(other),
HybridBitSet::Dense(self_dense) => {
<BitSet<T> as BitRelations<HybridBitSet<T>>>::intersect(self_dense, other)
HybridBitSet::Sparse(self_sparse) => {
sparse_intersect(self_sparse, |elem| other.contains(*elem))
}
HybridBitSet::Dense(self_dense) => self_dense.intersect(other),
}
}
}