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| author | Camille GILLOT <gillot.camille@gmail.com> | 2019-12-30 23:09:35 +0100 |
|---|---|---|
| committer | Camille GILLOT <gillot.camille@gmail.com> | 2019-12-30 23:09:35 +0100 |
| commit | be6cb63fcc13fc52457b5fa2199711740ea08716 (patch) | |
| tree | 71dc8bf3091f8901a40729413aed9bc3ada07d12 | |
| parent | 8f05d12c6778b524e9209a6a32cbfe617f92428c (diff) | |
| download | rust-be6cb63fcc13fc52457b5fa2199711740ea08716.tar.gz rust-be6cb63fcc13fc52457b5fa2199711740ea08716.zip | |
Reduce allocations.
| -rw-r--r-- | src/librustc/hir/lowering.rs | 14 | ||||
| -rw-r--r-- | src/librustc/hir/lowering/item.rs | 2 | ||||
| -rw-r--r-- | src/librustc/lib.rs | 1 |
3 files changed, 8 insertions, 9 deletions
diff --git a/src/librustc/hir/lowering.rs b/src/librustc/hir/lowering.rs index 8f9de3f4277..1aade029585 100644 --- a/src/librustc/hir/lowering.rs +++ b/src/librustc/hir/lowering.rs @@ -73,12 +73,10 @@ use syntax_pos::Span; use rustc_error_codes::*; macro_rules! arena_vec { - () => ( - &[] - ); - ($this:expr; $($x:expr),*) => ( - $this.arena.alloc_from_iter(vec![$($x),*]) - ); + ($this:expr; $($x:expr),*) => ({ + let a = [$($x),*]; + $this.arena.alloc_from_iter(std::array::IntoIter::new(a)) + }); } mod expr; @@ -2018,7 +2016,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> { FunctionRetTy::Ty(ty) => this.lower_ty(&ty, ImplTraitContext::disallowed()), FunctionRetTy::Default(_) => this.arena.alloc(this.ty_tup(span, &[])), }; - let args = vec![GenericArg::Type(this.ty_tup(span, inputs))]; + let args = smallvec![GenericArg::Type(this.ty_tup(span, inputs))]; let binding = hir::TypeBinding { hir_id: this.next_id(), ident: Ident::with_dummy_span(FN_OUTPUT_NAME), @@ -3300,7 +3298,7 @@ fn body_ids(bodies: &BTreeMap<hir::BodyId, hir::Body<'hir>>) -> Vec<hir::BodyId> /// Helper struct for delayed construction of GenericArgs. struct GenericArgsCtor<'hir> { - args: Vec<hir::GenericArg<'hir>>, + args: SmallVec<[hir::GenericArg<'hir>; 1]>, bindings: &'hir [hir::TypeBinding<'hir>], parenthesized: bool, } diff --git a/src/librustc/hir/lowering/item.rs b/src/librustc/hir/lowering/item.rs index 37450b25d85..8c34aed5d5f 100644 --- a/src/librustc/hir/lowering/item.rs +++ b/src/librustc/hir/lowering/item.rs @@ -1424,7 +1424,7 @@ impl<'hir> LoweringContext<'_, 'hir> { /// Helper struct for delayed construction of Generics. pub(super) struct GenericsCtor<'hir> { - pub(super) params: Vec<hir::GenericParam<'hir>>, + pub(super) params: SmallVec<[hir::GenericParam<'hir>; 1]>, where_clause: hir::WhereClause<'hir>, span: Span, } diff --git a/src/librustc/lib.rs b/src/librustc/lib.rs index 76588dfa5e2..4e7913b8dfc 100644 --- a/src/librustc/lib.rs +++ b/src/librustc/lib.rs @@ -28,6 +28,7 @@ #![doc(html_root_url = "https://doc.rust-lang.org/nightly/")] #![feature(arbitrary_self_types)] +#![feature(array_value_iter)] #![feature(bool_to_option)] #![feature(box_patterns)] #![feature(box_syntax)] |