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Auto merge of #99725 - lcnr:dedup-region_bound_pairs, r=compiler-errors

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use `FxIndexSet` for `region_bound_pairs`

should help with #99217 and might generally be a perf improvement.

r? types
This commit is contained in:
bors 2022-07-27 22:02:14 +00:00
commit ada80a13b9
5 changed files with 37 additions and 35 deletions
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10
compiler/rustc_borrowck/src/type_check/constraint_conversion.rs
View file

@ -22,6 +22,16 @@ pub(crate) struct ConstraintConversion<'a, 'tcx> {
infcx: &'a InferCtxt<'a, 'tcx>,
tcx: TyCtxt<'tcx>,
universal_regions: &'a UniversalRegions<'tcx>,
/// Each RBP `GK: 'a` is assumed to be true. These encode
/// relationships like `T: 'a` that are added via implicit bounds
/// or the `param_env`.
///
/// Each region here is guaranteed to be a key in the `indices`
/// map. We use the "original" regions (i.e., the keys from the
/// map, and not the values) because the code in
/// `process_registered_region_obligations` has some special-cased
/// logic expecting to see (e.g.) `ReStatic`, and if we supplied
/// our special inference variable there, we would mess that up.
region_bound_pairs: &'a RegionBoundPairs<'tcx>,
implicit_region_bound: ty::Region<'tcx>,
param_env: ty::ParamEnv<'tcx>,

21
compiler/rustc_borrowck/src/type_check/free_region_relations.rs
View file

@ -2,6 +2,7 @@ use rustc_data_structures::frozen::Frozen;
use rustc_data_structures::transitive_relation::TransitiveRelation;
use rustc_infer::infer::canonical::QueryRegionConstraints;
use rustc_infer::infer::outlives;
use rustc_infer::infer::outlives::env::RegionBoundPairs;
use rustc_infer::infer::region_constraints::GenericKind;
use rustc_infer::infer::InferCtxt;
use rustc_middle::mir::ConstraintCategory;
@ -34,18 +35,6 @@ pub(crate) struct UniversalRegionRelations<'tcx> {
inverse_outlives: TransitiveRelation<RegionVid>,
}
/// Each RBP `('a, GK)` indicates that `GK: 'a` can be assumed to
/// be true. These encode relationships like `T: 'a` that are
/// added via implicit bounds.
///
/// Each region here is guaranteed to be a key in the `indices`
/// map. We use the "original" regions (i.e., the keys from the
/// map, and not the values) because the code in
/// `process_registered_region_obligations` has some special-cased
/// logic expecting to see (e.g.) `ReStatic`, and if we supplied
/// our special inference variable there, we would mess that up.
type RegionBoundPairs<'tcx> = Vec<(ty::Region<'tcx>, GenericKind<'tcx>)>;
/// As part of computing the free region relations, we also have to
/// normalize the input-output types, which we then need later. So we
/// return those. This vector consists of first the input types and
@ -71,7 +60,7 @@ pub(crate) fn create<'tcx>(
implicit_region_bound,
constraints,
universal_regions: universal_regions.clone(),
region_bound_pairs: Vec::new(),
region_bound_pairs: Default::default(),
relations: UniversalRegionRelations {
universal_regions: universal_regions.clone(),
outlives: Default::default(),
@ -371,11 +360,13 @@ impl<'tcx> UniversalRegionRelationsBuilder<'_, 'tcx> {
}
OutlivesBound::RegionSubParam(r_a, param_b) => {
self.region_bound_pairs.push((r_a, GenericKind::Param(param_b)));
self.region_bound_pairs
.insert(ty::OutlivesPredicate(GenericKind::Param(param_b), r_a));
}
OutlivesBound::RegionSubProjection(r_a, projection_b) => {
self.region_bound_pairs.push((r_a, GenericKind::Projection(projection_b)));
self.region_bound_pairs
.insert(ty::OutlivesPredicate(GenericKind::Projection(projection_b), r_a));
}
}
}