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| author | bors <bors@rust-lang.org> | 2024-08-14 00:56:53 +0000 |
|---|---|---|
| committer | bors <bors@rust-lang.org> | 2024-08-14 00:56:53 +0000 |
| commit | e9c965df7b75ab5b1ae8f9a2680839ac1a1a3880 (patch) | |
| tree | 4822d048daddf346eee47d7b2b844c98f0641906 /compiler/rustc_passes | |
| parent | e5b3e68abf170556b9d56c6f9028318e53c9f06b (diff) | |
| parent | bbd1c3ab73a931bf4823eec836de57e837d2161c (diff) | |
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`
Diffstat (limited to 'compiler/rustc_passes')
| -rw-r--r-- | compiler/rustc_passes/src/abi_test.rs | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/compiler/rustc_passes/src/abi_test.rs b/compiler/rustc_passes/src/abi_test.rs index 839b96fb3de..d0cc123c41a 100644 --- a/compiler/rustc_passes/src/abi_test.rs +++ b/compiler/rustc_passes/src/abi_test.rs @@ -127,14 +127,17 @@ fn dump_abi_of_fn_type(tcx: TyCtxt<'_>, item_def_id: LocalDefId, attr: &Attribut for meta_item in meta_items { match meta_item.name_or_empty() { sym::debug => { - let ty::FnPtr(sig) = ty.kind() else { + let ty::FnPtr(sig_tys, hdr) = ty.kind() else { span_bug!( meta_item.span(), "`#[rustc_abi(debug)]` on a type alias requires function pointer type" ); }; let abi = unwrap_fn_abi( - tcx.fn_abi_of_fn_ptr(param_env.and((*sig, /* extra_args */ ty::List::empty()))), + tcx.fn_abi_of_fn_ptr( + param_env + .and((sig_tys.with(*hdr), /* extra_args */ ty::List::empty())), + ), tcx, item_def_id, ); @@ -155,7 +158,7 @@ fn dump_abi_of_fn_type(tcx: TyCtxt<'_>, item_def_id: LocalDefId, attr: &Attribut "`#[rustc_abi(assert_eq)]` on a type alias requires pair type" ); }; - let ty::FnPtr(sig1) = field1.kind() else { + let ty::FnPtr(sig_tys1, hdr1) = field1.kind() else { span_bug!( meta_item.span(), "`#[rustc_abi(assert_eq)]` on a type alias requires pair of function pointer types" @@ -163,12 +166,13 @@ fn dump_abi_of_fn_type(tcx: TyCtxt<'_>, item_def_id: LocalDefId, attr: &Attribut }; let abi1 = unwrap_fn_abi( tcx.fn_abi_of_fn_ptr( - param_env.and((*sig1, /* extra_args */ ty::List::empty())), + param_env + .and((sig_tys1.with(*hdr1), /* extra_args */ ty::List::empty())), ), tcx, item_def_id, ); - let ty::FnPtr(sig2) = field2.kind() else { + let ty::FnPtr(sig_tys2, hdr2) = field2.kind() else { span_bug!( meta_item.span(), "`#[rustc_abi(assert_eq)]` on a type alias requires pair of function pointer types" @@ -176,7 +180,8 @@ fn dump_abi_of_fn_type(tcx: TyCtxt<'_>, item_def_id: LocalDefId, attr: &Attribut }; let abi2 = unwrap_fn_abi( tcx.fn_abi_of_fn_ptr( - param_env.and((*sig2, /* extra_args */ ty::List::empty())), + param_env + .and((sig_tys2.with(*hdr2), /* extra_args */ ty::List::empty())), ), tcx, item_def_id, |