diff --git a/llvm/lib/CodeGen/MachineFunctionSplitter.cpp b/llvm/lib/CodeGen/MachineFunctionSplitter.cpp
--- a/llvm/lib/CodeGen/MachineFunctionSplitter.cpp
+++ b/llvm/lib/CodeGen/MachineFunctionSplitter.cpp
@@ -59,6 +59,12 @@
         "Minimum number of times a block must be executed to be retained."),
     cl::init(1), cl::Hidden);
 
+static cl::opt<unsigned>
+    ColdSizeThreshold("mfs-size-threshold",
+                      cl::desc("Maximum number of instructions a cold block "
+                               "may have and still be retained."),
+                      cl::init(0), cl::Hidden);
+
 static cl::opt<bool> SplitAllEHCode(
     "mfs-split-ehcode",
     cl::desc("Splits all EH code and it's descendants by default."),
@@ -97,6 +103,9 @@
 static bool isColdBlock(const MachineBasicBlock &MBB,
                         const MachineBlockFrequencyInfo *MBFI,
                         ProfileSummaryInfo *PSI) {
+  if (MBB.size() <= ColdSizeThreshold)
+    return false;
+
   std::optional<uint64_t> Count = MBFI->getBlockProfileCount(&MBB);
   if (!Count)
     return true;