LLVM  14.0.0git
MergedLoadStoreMotion.h
Go to the documentation of this file.
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 {
34 
36  SplitFooterBB = SFBB;
37  return *this;
38  }
39 };
40 
42  : public PassInfoMixin<MergedLoadStoreMotionPass> {
44 
45 public:
49  : Options(PassOptions) {}
51 };
52 }
53 
54 #endif // LLVM_TRANSFORMS_SCALAR_MERGEDLOADSTOREMOTION_H
llvm::PreservedAnalyses
A set of analyses that are preserved following a run of a transformation pass.
Definition: PassManager.h:155
llvm
---------------------— PointerInfo ------------------------------------—
Definition: AllocatorList.h:23
llvm::PassInfoMixin
A CRTP mix-in to automatically provide informational APIs needed for passes.
Definition: PassManager.h:374
llvm::Function
Definition: Function.h:61
Module.h
F
#define F(x, y, z)
Definition: MD5.cpp:56
llvm::MergedLoadStoreMotionOptions::MergedLoadStoreMotionOptions
MergedLoadStoreMotionOptions(bool SplitFooterBB=false)
Definition: MergedLoadStoreMotion.h:32
llvm::MergedLoadStoreMotionOptions
Definition: MergedLoadStoreMotion.h:30
Options
const char LLVMTargetMachineRef LLVMPassBuilderOptionsRef Options
Definition: PassBuilderBindings.cpp:48
llvm::MergedLoadStoreMotionPass::run
PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM)
Definition: MergedLoadStoreMotion.cpp:412
llvm::MergedLoadStoreMotionPass
Definition: MergedLoadStoreMotion.h:41
llvm::MergedLoadStoreMotionPass::MergedLoadStoreMotionPass
MergedLoadStoreMotionPass(const MergedLoadStoreMotionOptions &PassOptions)
Definition: MergedLoadStoreMotion.h:48
llvm::MergedLoadStoreMotionOptions::SplitFooterBB
bool SplitFooterBB
Definition: MergedLoadStoreMotion.h:31
llvm::MergedLoadStoreMotionOptions::splitFooterBB
MergedLoadStoreMotionOptions & splitFooterBB(bool SFBB)
Definition: MergedLoadStoreMotion.h:35
PassManager.h
llvm::AnalysisManager
A container for analyses that lazily runs them and caches their results.
Definition: InstructionSimplify.h:44
llvm::MergedLoadStoreMotionPass::MergedLoadStoreMotionPass
MergedLoadStoreMotionPass()
Definition: MergedLoadStoreMotion.h:46