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Remove sharding for VecCache

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This sharding is never used (per the comment in code). If we re-add
sharding at some point in the future this is cheap to restore, but for
now no need for the extra complexity.
This commit is contained in:
Mark Rousskov 2024-04-06 10:49:31 -04:00
parent 01f7f3a1ff
commit 668b3188ab
1 changed files with 6 additions and 13 deletions
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19
compiler/rustc_query_system/src/query/caches.rs
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@ -101,7 +101,7 @@ fn iter(&self, f: &mut dyn FnMut(&Self::Key, &Self::Value, DepNodeIndex)) {
} }
pub struct VecCache<K: Idx, V> { pub struct VecCache<K: Idx, V> {
cache: Sharded<IndexVec<K, Option<(V, DepNodeIndex)>>>, cache: Lock<IndexVec<K, Option<(V, DepNodeIndex)>>>,
} }
impl<K: Idx, V> Default for VecCache<K, V> { impl<K: Idx, V> Default for VecCache<K, V> {
@ -120,24 +120,20 @@ impl<K, V> QueryCache for VecCache<K, V>
#[inline(always)] #[inline(always)]
fn lookup(&self, key: &K) -> Option<(V, DepNodeIndex)> { fn lookup(&self, key: &K) -> Option<(V, DepNodeIndex)> {
// FIXME: lock_shard_by_hash will use high bits which are usually zero in the index() passed let lock = self.cache.lock();
// here. This makes sharding essentially useless, always selecting the zero'th shard.
let lock = self.cache.lock_shard_by_hash(key.index() as u64);
if let Some(Some(value)) = lock.get(*key) { Some(*value) } else { None } if let Some(Some(value)) = lock.get(*key) { Some(*value) } else { None }
} }
#[inline] #[inline]
fn complete(&self, key: K, value: V, index: DepNodeIndex) { fn complete(&self, key: K, value: V, index: DepNodeIndex) {
let mut lock = self.cache.lock_shard_by_hash(key.index() as u64); let mut lock = self.cache.lock();
lock.insert(key, (value, index)); lock.insert(key, (value, index));
} }
fn iter(&self, f: &mut dyn FnMut(&Self::Key, &Self::Value, DepNodeIndex)) { fn iter(&self, f: &mut dyn FnMut(&Self::Key, &Self::Value, DepNodeIndex)) {
for shard in self.cache.lock_shards() { for (k, v) in self.cache.lock().iter_enumerated() {
for (k, v) in shard.iter_enumerated() { if let Some(v) = v {
if let Some(v) = v { f(&k, &v.0, v.1);
f(&k, &v.0, v.1);
}
} }
} }
} }
@ -149,9 +145,6 @@ pub struct DefIdCache<V> {
/// ///
/// The second element of the tuple is the set of keys actually present in the IndexVec, used /// The second element of the tuple is the set of keys actually present in the IndexVec, used
/// for faster iteration in `iter()`. /// for faster iteration in `iter()`.
// FIXME: This may want to be sharded, like VecCache. However *how* to shard an IndexVec isn't
// super clear; VecCache is effectively not sharded today (see FIXME there). For now just omit
// that complexity here.
local: Lock<(IndexVec<DefIndex, Option<(V, DepNodeIndex)>>, Vec<DefIndex>)>, local: Lock<(IndexVec<DefIndex, Option<(V, DepNodeIndex)>>, Vec<DefIndex>)>,
foreign: DefaultCache<DefId, V>, foreign: DefaultCache<DefId, V>,
} }