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rustc_span: avoid hashing ExpnId tag when using cached hash #78415

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Oct 28, 2020
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rustc_span: avoid hashing ExpnId tag when using cached hash #78415

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3 changes: 1 addition & 2 deletions compiler/rustc_span/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1925,9 +1925,7 @@ impl<CTX: HashStableContext> HashStable<CTX> for ExpnId {
return;
}

TAG_NOT_ROOT.hash_stable(ctx, hasher);
let index = self.as_u32() as usize;

let res = CACHE.with(|cache| cache.borrow().get(index).copied().flatten());

if let Some(res) = res {
Expand All @@ -1936,6 +1934,7 @@ impl<CTX: HashStableContext> HashStable<CTX> for ExpnId {
let new_len = index + 1;

let mut sub_hasher = StableHasher::new();
TAG_NOT_ROOT.hash_stable(ctx, &mut sub_hasher);
self.expn_data().hash_stable(ctx, &mut sub_hasher);
let sub_hash: Fingerprint = sub_hasher.finish();

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