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

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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@ -2113,7 +2113,7 @@ impl<'tcx> SelectionContext<'_, 'tcx> {
| ty::Bool
| ty::Float(_)
| ty::FnDef(..)
| ty::FnPtr(_)
| ty::FnPtr(..)
| ty::RawPtr(..)
| ty::Char
| ty::Ref(..)
@ -2170,7 +2170,7 @@ impl<'tcx> SelectionContext<'_, 'tcx> {
use self::BuiltinImplConditions::{Ambiguous, None, Where};
match *self_ty.kind() {
ty::FnDef(..) | ty::FnPtr(_) | ty::Error(_) => Where(ty::Binder::dummy(Vec::new())),
ty::FnDef(..) | ty::FnPtr(..) | ty::Error(_) => Where(ty::Binder::dummy(Vec::new())),
ty::Uint(_)
| ty::Int(_)
@ -2332,7 +2332,7 @@ impl<'tcx> SelectionContext<'_, 'tcx> {
| ty::Bool
| ty::Float(_)
| ty::FnDef(..)
| ty::FnPtr(_)
| ty::FnPtr(..)
| ty::Error(_)
| ty::Infer(ty::IntVar(_) | ty::FloatVar(_))
| ty::Never