[Support] Avoid repeated hash lookups (NFC) (#129000)

kazutakahirata · web-flow · commit 3ce387231a3e · 2025-02-27T01:46:37.000-08:00
diff --git a/llvm/lib/Support/DAGDeltaAlgorithm.cpp b/llvm/lib/Support/DAGDeltaAlgorithm.cpp
@@ -201,8 +201,9 @@ DAGDeltaAlgorithmImpl::DAGDeltaAlgorithmImpl(
     std::set<change_ty> &ChangeSuccs = SuccClosure[Change];
     for (pred_iterator_ty it = pred_begin(Change),
            ie = pred_end(Change); it != ie; ++it) {
-      SuccClosure[*it].insert(Change);
-      SuccClosure[*it].insert(ChangeSuccs.begin(), ChangeSuccs.end());
+      auto &SC = SuccClosure[*it];
+      SC.insert(Change);
+      SC.insert(ChangeSuccs.begin(), ChangeSuccs.end());
       Worklist.push_back(*it);
     }
   }

Original file line number	Diff line number	Diff line change
`@@ -201,8 +201,9 @@ DAGDeltaAlgorithmImpl::DAGDeltaAlgorithmImpl(`
`201`	`201`	`std::set<change_ty> &ChangeSuccs = SuccClosure[Change];`
`202`	`202`	`for (pred_iterator_ty it = pred_begin(Change),`
`203`	`203`	`ie = pred_end(Change); it != ie; ++it) {`
`204`		`- SuccClosure[*it].insert(Change);`
`205`		`- SuccClosure[*it].insert(ChangeSuccs.begin(), ChangeSuccs.end());`
	`204`	`+ auto &SC = SuccClosure[*it];`
	`205`	`+ SC.insert(Change);`
	`206`	`+ SC.insert(ChangeSuccs.begin(), ChangeSuccs.end());`
`206`	`207`	`Worklist.push_back(*it);`
`207`	`208`	`}`
`208`	`209`	`}`