diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 1a0c902..8c0ff29 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -473,7 +473,7 @@
 
   // We split CSR if the target supports it for the given function
   // and the function has only return exits.
-  if (TLI->supportSplitCSR(MF)) {
+  if (OptLevel != CodeGenOpt::None && TLI->supportSplitCSR(MF)) {
     FuncInfo->SplitCSR = true;
 
     // Collect all the return blocks.