Fix performance-unnecessary-copy-initialization

Summary: As title. Reviewed By: thezhangwei Differential Revision: D50897103 fbshipit-source-id: 143a76659b9e337d72d973102f292d423a965733
facebook · Nov 2, 2023 · 3f51958 · 3f51958
1 parent 5dd0e99
commit 3f51958
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/service/regalloc-fast/LiveInterval.cpp b/service/regalloc-fast/LiveInterval.cpp
@@ -164,7 +164,7 @@ VRegAliveRangeInBlock get_check_cast_throw_targets_live_range(
     const std::unordered_set<vreg_t>& vregs) {
   VRegAliveRangeInBlock vreg_block_range;
   const LivenessDomain& live_in = fixpoint_iter.get_live_in_vars_at(block);
-  auto elements = live_in.elements();
+  const auto& elements = live_in.elements();
   for (auto vreg : vregs) {
     if (!elements.contains(vreg)) {
       LiveIntervalPoint first = LiveIntervalPoint::get_block_begin(block);