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Optimize away a move #57027

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Dec 23, 2018
Merged

Optimize away a move #57027

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5 changes: 4 additions & 1 deletion src/librustc/ty/query/plumbing.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -136,11 +136,14 @@ impl<'a, 'tcx, Q: QueryDescription<'tcx>> JobOwner<'a, 'tcx, Q> {
Entry::Vacant(entry) => {
// No job entry for this query. Return a new one to be started later
return tls::with_related_context(tcx, |icx| {
// Create the `parent` variable before `info`. This allows LLVM
// to elide the move of `info`
let parent = icx.query.clone();
let info = QueryInfo {
span,
query: Q::query(key.clone()),
};
let job = Lrc::new(QueryJob::new(info, icx.query.clone()));
let job = Lrc::new(QueryJob::new(info, parent));
let owner = JobOwner {
cache,
job: job.clone(),
Expand Down