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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 {
34 
36  SplitFooterBB = SFBB;
37  return *this;
38  }
39 };
40 
42  : public PassInfoMixin<MergedLoadStoreMotionPass> {
44 
45 public:
49  : Options(PassOptions) {}
51  void printPipeline(raw_ostream &OS,
52  function_ref<StringRef(StringRef)> MapClassName2PassName);
53 };
54 }
55 
56 #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
This file implements support for optimizing divisions by a constant.
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:62
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::raw_ostream
This class implements an extremely fast bulk output stream that can only output to a stream.
Definition: raw_ostream.h:53
llvm::MergedLoadStoreMotionPass::run
PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM)
Definition: MergedLoadStoreMotion.cpp:412
llvm::MergedLoadStoreMotionPass
Definition: MergedLoadStoreMotion.h:41
llvm::function_ref
An efficient, type-erasing, non-owning reference to a callable.
Definition: STLExtras.h:168
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
llvm::StringRef
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:58
llvm::MergedLoadStoreMotionPass::printPipeline
void printPipeline(raw_ostream &OS, function_ref< StringRef(StringRef)> MapClassName2PassName)
Definition: MergedLoadStoreMotion.cpp:424
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