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Auto merge of #128812 - nnethercote:shrink-TyKind-FnPtr, r=compiler-errors

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Shrink `TyKind::FnPtr`.

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.

r? `@compiler-errors`
This commit is contained in:
bors 2024-08-14 00:56:53 +00:00
commit e9c965df7b
89 changed files with 315 additions and 231 deletions
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2
compiler/rustc_codegen_cranelift/src/common.rs
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@ -69,7 +69,7 @@ fn clif_type_from_ty<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> Option<types::Typ
FloatTy::F64 => types::F64,
FloatTy::F128 => unimplemented!("f16_f128"),
},
ty::FnPtr(_) => pointer_ty(tcx),
ty::FnPtr(..) => pointer_ty(tcx),
ty::RawPtr(pointee_ty, _) | ty::Ref(_, pointee_ty, _) => {
if has_ptr_meta(tcx, *pointee_ty) {
return None;