[NewGVN] Fold single-use variables. NFCI.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@309790 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/Scalar/NewGVN.cpp b/lib/Transforms/Scalar/NewGVN.cpp
index 192ce6b..99b29cd 100644 (file)
--- a/lib/Transforms/Scalar/NewGVN.cpp
+++ b/lib/Transforms/Scalar/NewGVN.cpp
@@ -781,11 +781,9 @@ bool StoreExpression::equals(const Expression &Other) const {
 
 // Determine if the edge From->To is a backedge
 bool NewGVN::isBackedge(BasicBlock *From, BasicBlock *To) const {
-  if (From == To)
-    return true;
-  auto *FromDTN = DT->getNode(From);
-  auto *ToDTN = DT->getNode(To);
-  return RPOOrdering.lookup(FromDTN) >= RPOOrdering.lookup(ToDTN);
+  return From == To ||
+         RPOOrdering.lookup(DT->getNode(From)) >=
+             RPOOrdering.lookup(DT->getNode(To));
 }
 
 #ifndef NDEBUG