diff --git a/llvm/include/llvm/CodeGen/MIRYamlMapping.h b/llvm/include/llvm/CodeGen/MIRYamlMapping.h
--- a/llvm/include/llvm/CodeGen/MIRYamlMapping.h
+++ b/llvm/include/llvm/CodeGen/MIRYamlMapping.h
@@ -704,6 +704,7 @@
   bool HasEHCatchret = false;
   bool HasEHScopes = false;
   bool HasEHFunclets = false;
+  bool IsOutlined = false;
 
   bool FailsVerification = false;
   bool TracksDebugUserValues = false;
@@ -742,6 +743,7 @@
     YamlIO.mapOptional("hasEHCatchret", MF.HasEHCatchret, false);
     YamlIO.mapOptional("hasEHScopes", MF.HasEHScopes, false);
     YamlIO.mapOptional("hasEHFunclets", MF.HasEHFunclets, false);
+    YamlIO.mapOptional("isOutlined", MF.IsOutlined, false);
     YamlIO.mapOptional("debugInstrRef", MF.UseDebugInstrRef, false);
 
     YamlIO.mapOptional("failsVerification", MF.FailsVerification, false);
diff --git a/llvm/include/llvm/CodeGen/MachineFunction.h b/llvm/include/llvm/CodeGen/MachineFunction.h
--- a/llvm/include/llvm/CodeGen/MachineFunction.h
+++ b/llvm/include/llvm/CodeGen/MachineFunction.h
@@ -374,6 +374,7 @@
   bool HasEHCatchret = false;
   bool HasEHScopes = false;
   bool HasEHFunclets = false;
+  bool IsOutlined = false;
 
   /// BBID to assign to the next basic block of this function.
   unsigned NextBBID = 0;
@@ -1116,6 +1117,9 @@
   bool hasEHFunclets() const { return HasEHFunclets; }
   void setHasEHFunclets(bool V) { HasEHFunclets = V; }
 
+  bool isOutlined() const { return IsOutlined; }
+  void setIsOutlined(bool V) { IsOutlined = V; }
+
   /// Find or create an LandingPadInfo for the specified MachineBasicBlock.
   LandingPadInfo &getOrCreateLandingPadInfo(MachineBasicBlock *LandingPad);
 
diff --git a/llvm/lib/CodeGen/MIRParser/MIRParser.cpp b/llvm/lib/CodeGen/MIRParser/MIRParser.cpp
--- a/llvm/lib/CodeGen/MIRParser/MIRParser.cpp
+++ b/llvm/lib/CodeGen/MIRParser/MIRParser.cpp
@@ -468,6 +468,7 @@
   MF.setHasEHCatchret(YamlMF.HasEHCatchret);
   MF.setHasEHScopes(YamlMF.HasEHScopes);
   MF.setHasEHFunclets(YamlMF.HasEHFunclets);
+  MF.setIsOutlined(YamlMF.IsOutlined);
 
   if (YamlMF.Legalized)
     MF.getProperties().set(MachineFunctionProperties::Property::Legalized);
diff --git a/llvm/lib/CodeGen/MIRPrinter.cpp b/llvm/lib/CodeGen/MIRPrinter.cpp
--- a/llvm/lib/CodeGen/MIRPrinter.cpp
+++ b/llvm/lib/CodeGen/MIRPrinter.cpp
@@ -200,6 +200,7 @@
   YamlMF.HasEHCatchret = MF.hasEHCatchret();
   YamlMF.HasEHScopes = MF.hasEHScopes();
   YamlMF.HasEHFunclets = MF.hasEHFunclets();
+  YamlMF.IsOutlined = MF.isOutlined();
   YamlMF.UseDebugInstrRef = MF.useDebugInstrRef();
 
   YamlMF.Legalized = MF.getProperties().hasProperty(
diff --git a/llvm/lib/CodeGen/MachineOutliner.cpp b/llvm/lib/CodeGen/MachineOutliner.cpp
--- a/llvm/lib/CodeGen/MachineOutliner.cpp
+++ b/llvm/lib/CodeGen/MachineOutliner.cpp
@@ -725,6 +725,7 @@
 
   MachineModuleInfo &MMI = getAnalysis<MachineModuleInfoWrapperPass>().getMMI();
   MachineFunction &MF = MMI.getOrCreateMachineFunction(*F);
+  MF.setIsOutlined(true);
   MachineBasicBlock &MBB = *MF.CreateMachineBasicBlock();
 
   // Insert the new function into the module.
diff --git a/llvm/test/CodeGen/RISCV/machineoutliner.mir b/llvm/test/CodeGen/RISCV/machineoutliner.mir
--- a/llvm/test/CodeGen/RISCV/machineoutliner.mir
+++ b/llvm/test/CodeGen/RISCV/machineoutliner.mir
@@ -1,7 +1,7 @@
 # RUN: llc -march=riscv32 -x mir -run-pass=machine-outliner -simplify-mir -verify-machineinstrs < %s \
-# RUN: | FileCheck -check-prefix=RV32I-MO %s
+# RUN: | FileCheck -check-prefixes=CHECK,RV32I-MO %s
 # RUN: llc -march=riscv64 -x mir -run-pass=machine-outliner -simplify-mir -verify-machineinstrs < %s \
-# RUN: | FileCheck -check-prefix=RV64I-MO %s
+# RUN: | FileCheck -check-prefixes=CHECK,RV64I-MO %s
 
 --- |
   define i32 @outline_0(i32 %a, i32 %b) { ret i32 0 }
@@ -24,6 +24,7 @@
 ---
 name:            outline_0
 tracksRegLiveness: true
+isOutlined: false
 body:             |
   bb.0:
     liveins: $x10, $x11
@@ -42,6 +43,7 @@
 ---
 name:            outline_1
 tracksRegLiveness: true
+isOutlined: false
 body:             |
   bb.0:
     liveins: $x10, $x11
@@ -60,6 +62,7 @@
 ---
 name:            outline_2
 tracksRegLiveness: true
+isOutlined: false
 body:             |
   bb.0:
     liveins: $x10, $x11
@@ -78,6 +81,7 @@
 ---
 name:            dont_outline_0
 tracksRegLiveness: true
+isOutlined: false
 body:             |
   bb.0:
     liveins: $x10, $x11
@@ -96,6 +100,7 @@
 ---
 name:            dont_outline_1
 tracksRegLiveness: true
+isOutlined: false
 body:             |
   bb.0:
     liveins: $x10, $x11
@@ -114,6 +119,7 @@
 ---
 name:            dont_outline_2
 tracksRegLiveness: true
+isOutlined: false
 body:             |
   bb.0:
     liveins: $x10, $x11, $x5
@@ -130,3 +136,6 @@
     PseudoRET implicit $x10
 
 ...
+
+# CHECK-LABEL: name: OUTLINED_FUNCTION_0
+# CHECK: isOutlined: true
diff --git a/llvm/tools/llvm-reduce/ReducerWorkItem.cpp b/llvm/tools/llvm-reduce/ReducerWorkItem.cpp
--- a/llvm/tools/llvm-reduce/ReducerWorkItem.cpp
+++ b/llvm/tools/llvm-reduce/ReducerWorkItem.cpp
@@ -372,6 +372,7 @@
   DstMF->setHasEHCatchret(SrcMF->hasEHCatchret());
   DstMF->setHasEHScopes(SrcMF->hasEHScopes());
   DstMF->setHasEHFunclets(SrcMF->hasEHFunclets());
+  DstMF->setIsOutlined(SrcMF->isOutlined());
 
   if (!SrcMF->getLandingPads().empty() ||
       !SrcMF->getCodeViewAnnotations().empty() ||