| //===- MergedLoadStoreMotion.h - merge and hoist/sink load/stores ---------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| //! \file |
| //! 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, FunctionAnalysisManager &AM); |
| }; |
| |
| } |
| |
| #endif // LLVM_TRANSFORMS_SCALAR_MERGEDLOADSTOREMOTION_H |