Index: llvm/include/llvm/CodeGen/MachineBasicBlock.h
===================================================================
--- llvm/include/llvm/CodeGen/MachineBasicBlock.h
+++ llvm/include/llvm/CodeGen/MachineBasicBlock.h
@@ -246,6 +246,7 @@
       MachineInstrBundleIterator<const MachineInstr, true>;
 
   unsigned size() const { return (unsigned)Insts.size(); }
+  unsigned sizeWithoutDebug() const;
   bool empty() const { return Insts.empty(); }
 
   MachineInstr       &instr_front()       { return Insts.front(); }
Index: llvm/lib/CodeGen/MachineBasicBlock.cpp
===================================================================
--- llvm/lib/CodeGen/MachineBasicBlock.cpp
+++ llvm/lib/CodeGen/MachineBasicBlock.cpp
@@ -1617,6 +1617,11 @@
   return liveout_iterator(*this, ExceptionPointer, ExceptionSelector, false);
 }
 
+unsigned MachineBasicBlock::sizeWithoutDebug() const {
+  auto R = instructionsWithoutDebug(begin(), end());
+  return std::distance(R.begin(), R.end());
+}
+
 const MBBSectionID MBBSectionID::ColdSectionID(MBBSectionID::SectionType::Cold);
 const MBBSectionID
     MBBSectionID::ExceptionSectionID(MBBSectionID::SectionType::Exception);
Index: llvm/lib/CodeGen/MachineSink.cpp
===================================================================
--- llvm/lib/CodeGen/MachineSink.cpp
+++ llvm/lib/CodeGen/MachineSink.cpp
@@ -1175,7 +1175,7 @@
 
       // If this BB is too big or the block number in straight line between From
       // and To is too big, stop searching to save compiling time.
-      if (BB->size() > SinkLoadInstsPerBlockThreshold ||
+      if (BB->sizeWithoutDebug() > SinkLoadInstsPerBlockThreshold ||
           HandledDomBlocks.size() > SinkLoadBlocksThreshold) {
         for (auto *DomBB : HandledDomBlocks) {
           if (DomBB != BB && DT->dominates(DomBB, BB))
@@ -1277,7 +1277,7 @@
         dbgs() << "CycleSink: Not sinking, sink block is the preheader\n");
     return false;
   }
-  if (SinkBlock->size() > SinkLoadInstsPerBlockThreshold) {
+  if (SinkBlock->sizeWithoutDebug() > SinkLoadInstsPerBlockThreshold) {
     LLVM_DEBUG(
         dbgs() << "CycleSink: Not Sinking, block too large to analyse.\n");
     return false;