Index: lib/CodeGen/MachineTraceMetrics.cpp
===================================================================
--- lib/CodeGen/MachineTraceMetrics.cpp
+++ lib/CodeGen/MachineTraceMetrics.cpp
@@ -331,17 +331,17 @@
   // Don't leave loops, and never follow back-edges.
   if (CurLoop && MBB == CurLoop->getHeader())
     return nullptr;
-  unsigned CurCount = MTM.getResources(MBB)->InstrCount;
   const MachineBasicBlock *Best = nullptr;
   unsigned BestDepth = 0;
   for (const MachineBasicBlock *Pred : MBB->predecessors()) {
+    unsigned PredInstrCount = MTM.getResources(Pred)->InstrCount;
     const MachineTraceMetrics::TraceBlockInfo *PredTBI =
       getDepthResources(Pred);
     // Ignore cycles that aren't natural loops.
     if (!PredTBI)
       continue;
     // Pick the predecessor that would give this block the smallest InstrDepth.
-    unsigned Depth = PredTBI->InstrDepth + CurCount;
+    unsigned Depth = PredTBI->InstrDepth + PredInstrCount;
     if (!Best || Depth < BestDepth) {
       Best = Pred;
       BestDepth = Depth;