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Auto merge of #114611 - nnethercote:type-system-chess, r=compiler-errors

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Speed up compilation of `type-system-chess`

[`type-system-chess`](https://github.com/rust-lang/rustc-perf/pull/1680) is an unusual program that implements a compile-time chess position solver in the trait system(!)  This PR is about making it compile faster.

r? `@ghost`
This commit is contained in:
bors 2023-08-18 06:29:38 +00:00
commit a1e1dba9cc
2 changed files with 27 additions and 10 deletions
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13
compiler/rustc_trait_selection/src/traits/project.rs
View file

@ -1214,7 +1214,7 @@ fn opt_normalize_projection_type<'a, 'b, 'tcx>(
let projected_term = selcx.infcx.resolve_vars_if_possible(projected_term);
let mut result = if projected_term.has_projections() {
let result = if projected_term.has_projections() {
let mut normalizer = AssocTypeNormalizer::new(
selcx,
param_env,
@ -1224,19 +1224,14 @@ fn opt_normalize_projection_type<'a, 'b, 'tcx>(
);
let normalized_ty = normalizer.fold(projected_term);
let mut deduped = SsoHashSet::with_capacity(projected_obligations.len());
projected_obligations.retain(|obligation| deduped.insert(obligation.clone()));
Normalized { value: normalized_ty, obligations: projected_obligations }
} else {
Normalized { value: projected_term, obligations: projected_obligations }
};
let mut deduped: SsoHashSet<_> = Default::default();
result.obligations.retain(|projected_obligation| {
if !deduped.insert(projected_obligation.clone()) {
return false;
}
true
});
if use_cache {
infcx.inner.borrow_mut().projection_cache().insert_term(cache_key, result.clone());
}