bjoernager/rust
bjoernager/rust
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Shrink hir::def::Res.

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`Res::SelfTy` currently has two `Option`s. When the second one is `Some`
the first one is never consulted. So we can split it into two variants,
`Res::SelfTyParam` and `Res::SelfTyAlias`, reducing the size of `Res`
from 24 bytes to 12. This then shrinks `hir::Path` and
`hir::PathSegment`, which are the HIR types that take up the most space.
This commit is contained in:
Nicholas Nethercote 2022-09-16 11:45:33 +10:00
parent 5f29a13a5b
commit f07d4efc45
28 changed files with 224 additions and 185 deletions
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10
compiler/rustc_hir/src/hir.rs
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@ -2404,8 +2404,9 @@ impl<'hir> Ty<'hir> {
return None;
};
match path.res {
Res::Def(DefKind::TyParam, def_id)
| Res::SelfTy { trait_: Some(def_id), alias_to: None } => Some((def_id, segment.ident)),
Res::Def(DefKind::TyParam, def_id) | Res::SelfTyParam { trait_: def_id } => {
Some((def_id, segment.ident))
}
_ => None,
}
}
@ -3533,9 +3534,10 @@ mod size_asserts {
static_assert_size!(Param<'_>, 32);
static_assert_size!(Pat<'_>, 72);
static_assert_size!(PatKind<'_>, 48);
static_assert_size!(Path<'_>, 48);
static_assert_size!(PathSegment<'_>, 56);
static_assert_size!(Path<'_>, 40);
static_assert_size!(PathSegment<'_>, 48);
static_assert_size!(QPath<'_>, 24);
static_assert_size!(Res, 12);
static_assert_size!(Stmt<'_>, 32);
static_assert_size!(StmtKind<'_>, 16);
static_assert_size!(TraitItem<'_>, 88);