Changed interners to start preallocated with an increased capacity

Author: FractalFir

compiler/rustc_data_structures/src/sharded.rs

@@ -143,6 +143,9 @@ pub fn shards() -> usize {
 pub type ShardedHashMap<K, V> = Sharded<FxHashMap<K, V>>;
 
 impl<K: Eq, V> ShardedHashMap<K, V> {
+    pub fn with_capacity(cap:usize)->Self{
+        Self::new(||{FxHashMap::with_capacity_and_hasher(cap, rustc_hash::FxBuildHasher::default())})
+    }
     pub fn len(&self) -> usize {
         self.lock_shards().map(|shard| shard.len()).sum()
     }

compiler/rustc_middle/src/ty/context.rs

@@ -811,33 +811,34 @@ pub struct CtxtInterners<'tcx> {
 }
 
 impl<'tcx> CtxtInterners<'tcx> {
-    fn new(arena: &'tcx WorkerLocal<Arena<'tcx>>) -> CtxtInterners<'tcx> {
+    fn new(arena: &'tcx WorkerLocal<Arena<'tcx>>) -> CtxtInterners<'tcx> { 
         CtxtInterners {
             arena,
-            type_: Default::default(),
-            const_lists: Default::default(),
-            args: Default::default(),
-            type_lists: Default::default(),
-            region: Default::default(),
-            poly_existential_predicates: Default::default(),
-            canonical_var_infos: Default::default(),
-            predicate: Default::default(),
-            clauses: Default::default(),
-            projs: Default::default(),
-            place_elems: Default::default(),
-            const_: Default::default(),
-            pat: Default::default(),
-            const_allocation: Default::default(),
-            bound_variable_kinds: Default::default(),
-            layout: Default::default(),
-            adt_def: Default::default(),
-            external_constraints: Default::default(),
-            predefined_opaques_in_body: Default::default(),
-            fields: Default::default(),
-            local_def_ids: Default::default(),
-            captures: Default::default(),
-            offset_of: Default::default(),
-            valtree: Default::default(),
+            // There are likely to be a lot of types. This should occupy 0.4 MB.
+            type_: InternedSet::with_capacity(16384),
+            const_lists: InternedSet::with_capacity(4096),
+            args: InternedSet::with_capacity(4096),
+            type_lists: InternedSet::with_capacity(4096),
+            region: InternedSet::with_capacity(4096),
+            poly_existential_predicates: InternedSet::with_capacity(1024),
+            canonical_var_infos: InternedSet::with_capacity(1024),
+            predicate:InternedSet::with_capacity(1024),
+            clauses: InternedSet::with_capacity(1024),
+            projs: InternedSet::with_capacity(4096),
+            place_elems: InternedSet::with_capacity(4096),
+            const_: InternedSet::with_capacity(4096),
+            pat: InternedSet::with_capacity(1024),
+            const_allocation: InternedSet::with_capacity(1024),
+            bound_variable_kinds: InternedSet::with_capacity(1024),
+            layout: InternedSet::with_capacity(1024),
+            adt_def: InternedSet::with_capacity(1024),
+            external_constraints: InternedSet::with_capacity(1024),
+            predefined_opaques_in_body: InternedSet::with_capacity(1024),
+            fields: InternedSet::with_capacity(4096),
+            local_def_ids: InternedSet::with_capacity(1024),
+            captures: InternedSet::with_capacity(1024),
+            offset_of: InternedSet::with_capacity(1024),
+            valtree:  InternedSet::with_capacity(1024),
         }
     }