1 //===- MergedLoadStoreMotion.h - merge and hoist/sink load/stores ---------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 //! \file 11 //! \brief This pass performs merges of loads and stores on both sides of a 12 // diamond (hammock). It hoists the loads and sinks the stores. 13 // 14 // The algorithm iteratively hoists two loads to the same address out of a 15 // diamond (hammock) and merges them into a single load in the header. Similar 16 // it sinks and merges two stores to the tail block (footer). The algorithm 17 // iterates over the instructions of one side of the diamond and attempts to 18 // find a matching load/store on the other side. It hoists / sinks when it 19 // thinks it safe to do so. This optimization helps with eg. hiding load 20 // latencies, triggering if-conversion, and reducing static code size. 21 // 22 //===----------------------------------------------------------------------===// 23 24 #ifndef LLVM_TRANSFORMS_SCALAR_MERGEDLOADSTOREMOTION_H 25 #define LLVM_TRANSFORMS_SCALAR_MERGEDLOADSTOREMOTION_H 26 27 #include "llvm/IR/Module.h" 28 #include "llvm/IR/PassManager.h" 29 30 namespace llvm { 31 class MergedLoadStoreMotionPass 32 : public PassInfoMixin<MergedLoadStoreMotionPass> { 33 public: 34 PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM); 35 }; 36 37 } 38 39 #endif // LLVM_TRANSFORMS_SCALAR_MERGEDLOADSTOREMOTION_H 40
