bjoernager/rust
bjoernager/rust
1
Fork 0
Code Activity

Shrink TyKind::FnPtr.

Browse source 
By splitting the `FnSig` within `TyKind::FnPtr` into `FnSigTys` and
`FnHeader`, which can be packed more efficiently. This reduces the size
of the hot `TyKind` type from 32 bytes to 24 bytes on 64-bit platforms.
This reduces peak memory usage by a few percent on some benchmarks. It
also reduces cache misses and page faults similarly, though this doesn't
translate to clear cycles or wall-time improvements on CI.
This commit is contained in:
Nicholas Nethercote 2024-08-08 17:18:20 +10:00
parent 8640998869
commit c4717cc9d1
89 changed files with 298 additions and 201 deletions
Download patch file Download diff file Expand all files Collapse all files

5
compiler/rustc_smir/src/rustc_internal/internal.rs
View file

@ -131,7 +131,10 @@ impl RustcInternal for RigidTy {
RigidTy::FnDef(def, args) => {
rustc_ty::TyKind::FnDef(def.0.internal(tables, tcx), args.internal(tables, tcx))
}
RigidTy::FnPtr(sig) => rustc_ty::TyKind::FnPtr(sig.internal(tables, tcx)),
RigidTy::FnPtr(sig) => {
let (sig_tys, hdr) = sig.internal(tables, tcx).split();
rustc_ty::TyKind::FnPtr(sig_tys, hdr)
}
RigidTy::Closure(def, args) => {
rustc_ty::TyKind::Closure(def.0.internal(tables, tcx), args.internal(tables, tcx))
}

4
compiler/rustc_smir/src/rustc_smir/convert/ty.rs
View file

@ -352,7 +352,9 @@ impl<'tcx> Stable<'tcx> for ty::TyKind<'tcx> {
ty::FnDef(def_id, generic_args) => {
TyKind::RigidTy(RigidTy::FnDef(tables.fn_def(*def_id), generic_args.stable(tables)))
}
ty::FnPtr(poly_fn_sig) => TyKind::RigidTy(RigidTy::FnPtr(poly_fn_sig.stable(tables))),
ty::FnPtr(sig_tys, hdr) => {
TyKind::RigidTy(RigidTy::FnPtr(sig_tys.with(*hdr).stable(tables)))
}
ty::Dynamic(existential_predicates, region, dyn_kind) => {
TyKind::RigidTy(RigidTy::Dynamic(
existential_predicates