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Use UnhashMap for a few more maps

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This avoids hashing data that's already hashed.
This commit is contained in:
Mark Rousskov
2024-01-17 17:09:04 -05:00
parent c58a5da7d4
commit 510fcd318b
4 changed files with 28 additions and 6 deletions
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14
compiler/rustc_data_structures/src/stable_hasher.rs
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@@ -314,7 +314,19 @@ impl_stable_traits_for_trivial_type!(char);
impl_stable_traits_for_trivial_type!(());
impl_stable_traits_for_trivial_type!(Hash64);
impl_stable_traits_for_trivial_type!(Hash128);
// We need a custom impl as the default hash function will only hash half the bits. For stable
// hashing we want to hash the full 128-bit hash.
impl<CTX> HashStable<CTX> for Hash128 {
#[inline]
fn hash_stable(&self, _: &mut CTX, hasher: &mut StableHasher) {
self.as_u128().hash(hasher);
}
}
unsafe impl StableOrd for Hash128 {
const CAN_USE_UNSTABLE_SORT: bool = true;
}
impl<CTX> HashStable<CTX> for ! {
fn hash_stable(&self, _ctx: &mut CTX, _hasher: &mut StableHasher) {