1 //===- MergedLoadStoreMotion.h - merge and hoist/sink load/stores ---------===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
10 //! This pass performs merges of loads and stores on both sides of a
11 // diamond (hammock). It hoists the loads and sinks the stores.
13 // The algorithm iteratively hoists two loads to the same address out of a
14 // diamond (hammock) and merges them into a single load in the header. Similar
15 // it sinks and merges two stores to the tail block (footer). The algorithm
16 // iterates over the instructions of one side of the diamond and attempts to
17 // find a matching load/store on the other side. It hoists / sinks when it
18 // thinks it safe to do so. This optimization helps with eg. hiding load
19 // latencies, triggering if-conversion, and reducing static code size.
21 //===----------------------------------------------------------------------===//
23 #ifndef LLVM_TRANSFORMS_SCALAR_MERGEDLOADSTOREMOTION_H
24 #define LLVM_TRANSFORMS_SCALAR_MERGEDLOADSTOREMOTION_H
26 #include "llvm/IR/Module.h"
27 #include "llvm/IR/PassManager.h"
30 class MergedLoadStoreMotionPass
31 : public PassInfoMixin<MergedLoadStoreMotionPass> {
33 PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
38 #endif // LLVM_TRANSFORMS_SCALAR_MERGEDLOADSTOREMOTION_H