LLVM  10.0.0svn
MergedLoadStoreMotion.h
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1 //===- MergedLoadStoreMotion.h - merge and hoist/sink load/stores ---------===//
2 //
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
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 //! \file
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.
12 //
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.
20 //
21 //===----------------------------------------------------------------------===//
22 
23 #ifndef LLVM_TRANSFORMS_SCALAR_MERGEDLOADSTOREMOTION_H
24 #define LLVM_TRANSFORMS_SCALAR_MERGEDLOADSTOREMOTION_H
25 
26 #include "llvm/IR/Module.h"
27 #include "llvm/IR/PassManager.h"
28 
29 namespace llvm {
31  : public PassInfoMixin<MergedLoadStoreMotionPass> {
32 public:
34 };
35 
36 }
37 
38 #endif // LLVM_TRANSFORMS_SCALAR_MERGEDLOADSTOREMOTION_H
PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM)
This class represents lattice values for constants.
Definition: AllocatorList.h:23
F(f)
A CRTP mix-in to automatically provide informational APIs needed for passes.
Definition: PassManager.h:372
A set of analyses that are preserved following a run of a transformation pass.
Definition: PassManager.h:153
Module.h This file contains the declarations for the Module class.
This header defines various interfaces for pass management in LLVM.