LLVM  4.0.0
LazyBlockFrequencyInfo.cpp
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1 //===- LazyBlockFrequencyInfo.cpp - Lazy Block Frequency Analysis ---------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This is an alternative analysis pass to BlockFrequencyInfoWrapperPass. The
11 // difference is that with this pass the block frequencies are not computed when
12 // the analysis pass is executed but rather when the BFI results is explicitly
13 // requested by the analysis client.
14 //
15 //===----------------------------------------------------------------------===//
16 
19 #include "llvm/Analysis/LoopInfo.h"
20 
21 using namespace llvm;
22 
23 #define DEBUG_TYPE "lazy-block-freq"
24 
26  "Lazy Block Frequency Analysis", true, true)
27 INITIALIZE_PASS_DEPENDENCY(LazyBPIPass)
30  "Lazy Block Frequency Analysis", true, true)
31 
32 char LazyBlockFrequencyInfoPass::ID = 0;
33 
34 LazyBlockFrequencyInfoPass::LazyBlockFrequencyInfoPass() : FunctionPass(ID) {
36 }
37 
39  LBFI.getCalculated().print(OS);
40 }
41 
45  AU.setPreservesAll();
46 }
47 
48 void LazyBlockFrequencyInfoPass::releaseMemory() { LBFI.releaseMemory(); }
49 
51  auto &BPIPass = getAnalysis<LazyBranchProbabilityInfoPass>();
52  LoopInfo &LI = getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
53  LBFI.setAnalysis(&F, &BPIPass, &LI);
54  return false;
55 }
56 
61 }
62 
64  initializeLazyBPIPassPass(Registry);
67 }
static PassRegistry * getPassRegistry()
getPassRegistry - Access the global registry object, which is automatically initialized at applicatio...
This is an alternative analysis pass to BlockFrequencyInfoWrapperPass.
A Module instance is used to store all the information related to an LLVM module. ...
Definition: Module.h:52
A global registry used in conjunction with static constructors to make pluggable components (like tar...
Definition: Registry.h:45
Lazy Block Frequency true
void initializeLazyBFIPassPass(PassRegistry &Registry)
Helper for client passes to initialize dependent passes for LBFI.
static void getLazyBPIAnalysisUsage(AnalysisUsage &AU)
Helper for client passes to set up the analysis usage on behalf of this pass.
AnalysisUsage & addRequired()
#define INITIALIZE_PASS_DEPENDENCY(depName)
Definition: PassSupport.h:53
#define F(x, y, z)
Definition: MD5.cpp:51
void initializeLazyBPIPassPass(PassRegistry &Registry)
Helper for client passes to initialize dependent passes for LBPI.
void initializeLazyBlockFrequencyInfoPassPass(PassRegistry &)
#define DEBUG_TYPE
Represent the analysis usage information of a pass.
INITIALIZE_PASS_END(RegBankSelect, DEBUG_TYPE,"Assign register bank of generic virtual registers", false, false) RegBankSelect
FunctionPass class - This class is used to implement most global optimizations.
Definition: Pass.h:298
void releaseMemory() override
releaseMemory() - This member can be implemented by a pass if it wants to be able to release its memo...
bool runOnFunction(Function &F) override
runOnFunction - Virtual method overriden by subclasses to do the per-function processing of the pass...
void print(raw_ostream &OS, const Module *M) const override
print - Print out the internal state of the pass.
void setPreservesAll()
Set by analyses that do not transform their input at all.
static void getLazyBFIAnalysisUsage(AnalysisUsage &AU)
Helper for client passes to set up the analysis usage on behalf of this pass.
INITIALIZE_PASS_BEGIN(LazyBlockFrequencyInfoPass, DEBUG_TYPE,"Lazy Block Frequency Analysis", true, true) INITIALIZE_PASS_END(LazyBlockFrequencyInfoPass
Lazy Block Frequency Analysis
This class implements an extremely fast bulk output stream that can only output to a stream...
Definition: raw_ostream.h:44
The legacy pass manager's analysis pass to compute loop information.
Definition: LoopInfo.h:831
PassRegistry - This class manages the registration and intitialization of the pass subsystem as appli...
Definition: PassRegistry.h:40
void getAnalysisUsage(AnalysisUsage &AU) const override
getAnalysisUsage - This function should be overriden by passes that need analysis information to do t...