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Explain `with_reveal_all_normalized` usage

This commit is contained in:
Oli Scherer 2023-09-18 15:17:52 +00:00
parent de68911f4a
commit ee59531dfc
1 changed files with 3 additions and 0 deletions
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3
compiler/rustc_ty_utils/src/layout.rs
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@ -36,6 +36,9 @@ fn layout_of<'tcx>(
let (param_env, ty) = query.into_parts(); let (param_env, ty) = query.into_parts();
debug!(?ty); debug!(?ty);
// Optimization: We convert to RevealAll and convert opaque types in the where bounds
// to their hidden types. This reduces overall uncached invocations of `layout_of` and
// is thus a small performance improvement.
let param_env = param_env.with_reveal_all_normalized(tcx); let param_env = param_env.with_reveal_all_normalized(tcx);
let unnormalized_ty = ty; let unnormalized_ty = ty;