bjoernager/rust
bjoernager/rust
1
Fork 0
Code Issues Pull requests 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_middle/src/ty/layout.rs
View file

@ -801,7 +801,7 @@ where
| ty::Int(_)
| ty::Uint(_)
| ty::Float(_)
| ty::FnPtr(_)
| ty::FnPtr(..)
| ty::Never
| ty::FnDef(..)
| ty::CoroutineWitness(..)
@ -986,7 +986,8 @@ where
safe: None,
})
}
ty::FnPtr(fn_sig) if offset.bytes() == 0 => {
ty::FnPtr(sig_tys, hdr) if offset.bytes() == 0 => {
let fn_sig = sig_tys.with(hdr);
tcx.layout_of(param_env.and(Ty::new_fn_ptr(tcx, fn_sig))).ok().map(|layout| {
PointeeInfo { size: layout.size, align: layout.align.abi, safe: None }
})