diff --git a/llvm/include/llvm-c/Transforms/Scalar.h b/llvm/include/llvm-c/Transforms/Scalar.h
--- a/llvm/include/llvm-c/Transforms/Scalar.h
+++ b/llvm/include/llvm-c/Transforms/Scalar.h
@@ -119,6 +119,9 @@
 void LLVMAddScalarReplAggregatesPassWithThreshold(LLVMPassManagerRef PM,
                                                   int Threshold);
 
+/** See llvm::createSimpleLoopUnswitchPass function. */
+void LLVMAddSimpleLoopUnswitchPass(LLVMPassManagerRef PM);
+
 /** See llvm::createSimplifyLibCallsPass function. */
 void LLVMAddSimplifyLibCallsPass(LLVMPassManagerRef PM);
 
diff --git a/llvm/lib/Transforms/Scalar/Scalar.cpp b/llvm/lib/Transforms/Scalar/Scalar.cpp
--- a/llvm/lib/Transforms/Scalar/Scalar.cpp
+++ b/llvm/lib/Transforms/Scalar/Scalar.cpp
@@ -23,6 +23,7 @@
 #include "llvm/InitializePasses.h"
 #include "llvm/Transforms/Scalar/GVN.h"
 #include "llvm/Transforms/Scalar/Scalarizer.h"
+#include "llvm/Transforms/Scalar/SimpleLoopUnswitch.h"
 #include "llvm/Transforms/Utils/UnifyFunctionExitNodes.h"
 
 using namespace llvm;
@@ -248,6 +249,10 @@
   // NOTE: The simplify-libcalls pass has been removed.
 }
 
+void LLVMAddSimpleLoopUnswitchPass(LLVMPassManagerRef PM) {
+  unwrap(PM)->add(createSimpleLoopUnswitchLegacyPass());
+}
+
 void LLVMAddTailCallEliminationPass(LLVMPassManagerRef PM) {
   unwrap(PM)->add(createTailCallEliminationPass());
 }