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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_hir_analysis/src/check/intrinsicck.rs
View file

@ -68,7 +68,7 @@ impl<'a, 'tcx> InlineAsmCtxt<'a, 'tcx> {
ty::Float(FloatTy::F32) => Some(InlineAsmType::F32),
ty::Float(FloatTy::F64) => Some(InlineAsmType::F64),
ty::Float(FloatTy::F128) => Some(InlineAsmType::F128),
ty::FnPtr(_) => Some(asm_ty_isize),
ty::FnPtr(..) => Some(asm_ty_isize),
ty::RawPtr(ty, _) if self.is_thin_ptr_ty(ty) => Some(asm_ty_isize),
ty::Adt(adt, args) if adt.repr().simd() => {
let fields = &adt.non_enum_variant().fields;

2
compiler/rustc_hir_analysis/src/check/wfcheck.rs
View file

@ -951,7 +951,7 @@ fn check_param_wf(tcx: TyCtxt<'_>, param: &hir::GenericParam<'_>) -> Result<(),
} else {
let mut diag = match ty.kind() {
ty::Bool | ty::Char | ty::Int(_) | ty::Uint(_) | ty::Error(_) => return Ok(()),
ty::FnPtr(_) => tcx.dcx().struct_span_err(
ty::FnPtr(..) => tcx.dcx().struct_span_err(
hir_ty.span,
"using function pointers as const generic parameters is forbidden",
),

2
compiler/rustc_hir_analysis/src/coherence/inherent_impls.rs
View file

@ -172,7 +172,7 @@ impl<'tcx> InherentCollect<'tcx> {
| ty::RawPtr(_, _)
| ty::Ref(..)
| ty::Never
| ty::FnPtr(_)
| ty::FnPtr(..)
| ty::Tuple(..) => self.check_primitive_impl(id, self_ty),
ty::Alias(ty::Projection | ty::Inherent | ty::Opaque, _) | ty::Param(_) => {
Err(self.tcx.dcx().emit_err(errors::InherentNominal { span: item_span }))

4
compiler/rustc_hir_analysis/src/variance/constraints.rs
View file

@ -317,8 +317,8 @@ impl<'a, 'tcx> ConstraintContext<'a, 'tcx> {
self.add_constraint(current, data.index, variance);
}
ty::FnPtr(sig) => {
self.add_constraints_from_sig(current, sig, variance);
ty::FnPtr(sig_tys, hdr) => {
self.add_constraints_from_sig(current, sig_tys.with(hdr), variance);
}
ty::Error(_) => {