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Return a SmallVec from place_elements.

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These vectors are always small, so this avoids lots of allocations.
This commit is contained in:
Nicholas Nethercote 2018-06-18 16:32:28 +10:00
parent 8c7433a3cc
commit ba0bb02f6f
1 changed files with 3 additions and 2 deletions
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5
src/librustc_mir/borrow_check/path_utils.rs
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@ -21,6 +21,7 @@ use rustc::mir::{BasicBlock, Location, Mir, Place};
use rustc::mir::{Projection, ProjectionElem, BorrowKind};
use rustc::ty::{self, TyCtxt};
use rustc_data_structures::control_flow_graph::dominators::Dominators;
use rustc_data_structures::small_vec::SmallVec;
use std::iter;
pub(super) fn allow_two_phase_borrow<'a, 'tcx, 'gcx: 'tcx>(
@ -259,8 +260,8 @@ pub(super) fn places_conflict<'a, 'gcx: 'tcx, 'tcx>(
/// Return all the prefixes of `place` in reverse order, including
/// downcasts.
fn place_elements<'a, 'tcx>(place: &'a Place<'tcx>) -> Vec<&'a Place<'tcx>> {
let mut result = vec![];
fn place_elements<'a, 'tcx>(place: &'a Place<'tcx>) -> SmallVec<[&'a Place<'tcx>; 8]> {
let mut result = SmallVec::new();
let mut place = place;
loop {
result.push(place);