From c2f73b7fae270fab9e13edf8e24c82ada272558a Mon Sep 17 00:00:00 2001
From: Davide Italiano <davide@freebsd.org>
Date: Wed, 2 Aug 2017 04:05:49 +0000
Subject: [PATCH] [NewGVN] Fold single-use variables. NFCI.

llvm-svn: 309790
---
 llvm/lib/Transforms/Scalar/NewGVN.cpp | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/llvm/lib/Transforms/Scalar/NewGVN.cpp b/llvm/lib/Transforms/Scalar/NewGVN.cpp
index 192ce6bc9673..99b29cd46e81 100644
--- a/llvm/lib/Transforms/Scalar/NewGVN.cpp
+++ b/llvm/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