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Improve creation of 3 IndexVecs

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This commit is contained in:
ljedrz 2018-11-07 15:38:06 +01:00
parent ddd4b194a0
commit e3390d89ea
2 changed files with 4 additions and 4 deletions
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3
src/librustc/ty/query/on_disk_cache.rs
View File

@ -450,8 +450,7 @@ impl<'sess> OnDiskCache<'sess> {
.map(|&(cnum, ..)| cnum)
.max()
.unwrap_or(0) + 1;
let mut map = IndexVec::new();
map.resize(map_size as usize, None);
let mut map = IndexVec::from_elem_n(None, map_size as usize);
for &(prev_cnum, ref crate_name, crate_disambiguator) in prev_cnums {
let key = (crate_name.clone(), crate_disambiguator);

5
src/librustc_mir/shim.rs
View File

@ -196,7 +196,7 @@ fn build_drop_shim<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
let source_info = SourceInfo { span, scope: OUTERMOST_SOURCE_SCOPE };
let return_block = BasicBlock::new(1);
let mut blocks = IndexVec::new();
let mut blocks = IndexVec::with_capacity(2);
let block = |blocks: &mut IndexVec<_, _>, kind| {
blocks.push(BasicBlockData {
statements: vec![],
@ -768,7 +768,8 @@ fn build_call_shim<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
}));
}
let mut blocks = IndexVec::new();
let n_blocks = if let Adjustment::RefMut = rcvr_adjustment { 5 } else { 2 };
let mut blocks = IndexVec::with_capacity(n_blocks);
let block = |blocks: &mut IndexVec<_, _>, statements, kind, is_cleanup| {
blocks.push(BasicBlockData {
statements,