Reduce duplicated hash map lookups.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162362 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 5 deletions

diff --git a/lib/Analysis/LoopInfo.cpp b/lib/Analysis/LoopInfo.cpp
index 20c33a3d9d..49767d69b2 100644
--- a/lib/Analysis/LoopInfo.cpp
+++ b/lib/Analysis/LoopInfo.cpp
@@ -429,8 +429,8 @@ void UnloopUpdater::updateSubloopParents() {
     Unloop->removeChildLoop(llvm::prior(Unloop->end()));
 
     assert(SubloopParents.count(Subloop) && "DFS failed to visit subloop");
-    if (SubloopParents[Subloop])
-      SubloopParents[Subloop]->addChildLoop(Subloop);
+    if (Loop *Parent = SubloopParents[Subloop])
+      Parent->addChildLoop(Subloop);
     else
       LI->addTopLevelLoop(Subloop);
   }
@@ -456,9 +456,8 @@ Loop *UnloopUpdater::getNearestLoop(BasicBlock *BB, Loop *BBLoop) {
       assert(Subloop && "subloop is not an ancestor of the original loop");
     }
     // Get the current nearest parent of the Subloop exits, initially Unloop.
-    if (!SubloopParents.count(Subloop))
-      SubloopParents[Subloop] = Unloop;
-    NearLoop = SubloopParents[Subloop];
+    NearLoop =
+      SubloopParents.insert(std::make_pair(Subloop, Unloop)).first->second;
   }
 
   succ_iterator I = succ_begin(BB), E = succ_end(BB);