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Change several HashMaps to IndexMap to improve incremental hashing performance #90253

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Merged
merged 1 commit into from
Mar 11, 2022
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Change several HashMaps to IndexMap to improve incremental hashing performance #90253

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8 changes: 4 additions & 4 deletions compiler/rustc_middle/src/middle/region.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,7 @@
//! [rustc dev guide]: https://rustc-dev-guide.rust-lang.org/borrow_check.html

use crate::ty::TyCtxt;
use rustc_data_structures::fx::FxHashMap;
use rustc_data_structures::fx::{FxHashMap, FxIndexMap};
use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
use rustc_hir as hir;
use rustc_hir::Node;
Expand Down Expand Up @@ -215,14 +215,14 @@ pub struct ScopeTree {
/// conditional expression or repeating block. (Note that the
/// enclosing scope ID for the block associated with a closure is
/// the closure itself.)
pub parent_map: FxHashMap<Scope, (Scope, ScopeDepth)>,
pub parent_map: FxIndexMap<Scope, (Scope, ScopeDepth)>,

/// Maps from a variable or binding ID to the block in which that
/// variable is declared.
var_map: FxHashMap<hir::ItemLocalId, Scope>,
var_map: FxIndexMap<hir::ItemLocalId, Scope>,

/// Maps from a `NodeId` to the associated destruction scope (if any).
destruction_scopes: FxHashMap<hir::ItemLocalId, Scope>,
destruction_scopes: FxIndexMap<hir::ItemLocalId, Scope>,

/// `rvalue_scopes` includes entries for those expressions whose
/// cleanup scope is larger than the default. The map goes from the
Expand Down