Index: llvm/lib/Transforms/IPO/IROutliner.cpp
===================================================================
--- llvm/lib/Transforms/IPO/IROutliner.cpp
+++ llvm/lib/Transforms/IPO/IROutliner.cpp
@@ -691,8 +691,6 @@
     for (Instruction *I : DebugInsts)
       I->eraseFromParent();
   }
-
-  assert(NewEnds.size() > 0 && "No return instruction for new function?");
 }
 
 /// Find the the constants that will need to be lifted into arguments
Index: llvm/test/Transforms/IROutliner/outlining-no-return-functions.ll
===================================================================
--- /dev/null
+++ llvm/test/Transforms/IROutliner/outlining-no-return-functions.ll
@@ -0,0 +1,55 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --include-generated-funcs
+; RUN: opt -S -verify -iroutliner -ir-outlining-no-cost < %s | FileCheck %s
+
+; Make sure that we outline safely from functions with no return instructions.
+
+; The code extractor will insert return instructions in the outer function
+; due to assumptions about the contents of the outlined region.
+
+define void @f1() {
+bb:
+  br label %bb1
+bb1:
+  br label %bb1
+}
+
+define void @f2() {
+bb:
+  br label %bb1
+bb1:
+  br label %bb1
+}
+
+define void @f3() {
+bb:
+  br label %bb1
+bb1:
+  br label %bb1
+}
+; CHECK-LABEL: @f1(
+; CHECK-NEXT:  bb:
+; CHECK-NEXT:    br label [[BB1:%.*]]
+; CHECK:       bb1:
+; CHECK-NEXT:    br label [[BB1]]
+;
+;
+; CHECK-LABEL: @f2(
+; CHECK-NEXT:  bb:
+; CHECK-NEXT:    call void @outlined_ir_func_0()
+; CHECK-NEXT:    ret void
+;
+;
+; CHECK-LABEL: @f3(
+; CHECK-NEXT:  bb:
+; CHECK-NEXT:    call void @outlined_ir_func_0()
+; CHECK-NEXT:    ret void
+;
+;
+; CHECK-LABEL: define internal void @outlined_ir_func_0(
+; CHECK-NEXT:  newFuncRoot:
+; CHECK-NEXT:    br label [[BB_TO_OUTLINE:%.*]]
+; CHECK:       bb_to_outline:
+; CHECK-NEXT:    br label [[BB1:%.*]]
+; CHECK:       bb1:
+; CHECK-NEXT:    br label [[BB1]]
+;