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diff --git a/include/llvm/Transforms/Scalar/MergedLoadStoreMotion.h b/include/llvm/Transforms/Scalar/MergedLoadStoreMotion.h
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+++ b/include/llvm/Transforms/Scalar/MergedLoadStoreMotion.h
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+//===- MergedLoadStoreMotion.h - merge and hoist/sink load/stores ---------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//! \file
+//! \brief This pass performs merges of loads and stores on both sides of a
+//  diamond (hammock). It hoists the loads and sinks the stores.
+//
+// The algorithm iteratively hoists two loads to the same address out of a
+// diamond (hammock) and merges them into a single load in the header. Similar
+// it sinks and merges two stores to the tail block (footer). The algorithm
+// iterates over the instructions of one side of the diamond and attempts to
+// find a matching load/store on the other side. It hoists / sinks when it
+// thinks it safe to do so.  This optimization helps with eg. hiding load
+// latencies, triggering if-conversion, and reducing static code size.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TRANSFORMS_SCALAR_MERGEDLOADSTOREMOTION_H
+#define LLVM_TRANSFORMS_SCALAR_MERGEDLOADSTOREMOTION_H
+
+#include "llvm/IR/Module.h"
+#include "llvm/IR/PassManager.h"
+
+namespace llvm {
+class MergedLoadStoreMotionPass
+    : public PassInfoMixin<MergedLoadStoreMotionPass> {
+public:
+  PreservedAnalyses run(Function &F, AnalysisManager<Function> &AM);
+};
+
+}
+
+#endif // LLVM_TRANSFORMS_SCALAR_MERGEDLOADSTOREMOTION_H