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rustc_span: note the perf loss seen from IndexSet in symbol::Interner

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This commit is contained in:
Josh Stone 2020-08-09 12:41:09 -07:00
parent 1d03ffe0bc
commit ca0b89aa04
1 changed files with 4 additions and 0 deletions
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4
src/librustc_span/symbol.rs
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@ -1481,6 +1481,10 @@ impl<CTX> ToStableHashKey<CTX> for Symbol {
}
// The `&'static str`s in this type actually point into the arena.
//
// The `FxHashMap`+`Vec` pair could be replaced by `FxIndexSet`, but #75278
// found that to regress performance up to 2% in some cases. This might be
// revisited after further improvements to `indexmap`.
#[derive(Default)]
pub struct Interner {
arena: DroplessArena,