1 files changed, 11 insertions, 1 deletions

diff --git a/lib/Analysis/BlockFrequencyInfoImpl.cpp b/lib/Analysis/BlockFrequencyInfoImpl.cpp
index 6ceda06aac14a..48e23af2690a7 100644
--- a/lib/Analysis/BlockFrequencyInfoImpl.cpp
+++ b/lib/Analysis/BlockFrequencyInfoImpl.cpp
@@ -530,6 +530,13 @@ BlockFrequencyInfoImplBase::getFloatingBlockFreq(const BlockNode &Node) const {
   return Freqs[Node.Index].Scaled;
 }
 
+void BlockFrequencyInfoImplBase::setBlockFreq(const BlockNode &Node,
+                                              uint64_t Freq) {
+  assert(Node.isValid() && "Expected valid node");
+  assert(Node.Index < Freqs.size() && "Expected legal index");
+  Freqs[Node.Index].Integer = Freq;
+}
+
 std::string
 BlockFrequencyInfoImplBase::getBlockName(const BlockNode &Node) const {
   return std::string();
@@ -743,7 +750,10 @@ void BlockFrequencyInfoImplBase::adjustLoopHeaderMass(LoopData &Loop) {
     auto &BackedgeMass = Loop.BackedgeMass[Loop.getHeaderIndex(HeaderNode)];
     DEBUG(dbgs() << " - Add back edge mass for node "
                  << getBlockName(HeaderNode) << ": " << BackedgeMass << "\n");
-    Dist.addLocal(HeaderNode, BackedgeMass.getMass());
+    if (BackedgeMass.getMass() > 0)
+      Dist.addLocal(HeaderNode, BackedgeMass.getMass());
+    else
+      DEBUG(dbgs() << "   Nothing added. Back edge mass is zero\n");
   }
 
   DitheringDistributer D(Dist, LoopMass);