LLVM: llvm::LazyBranchProbabilityInfoPass Class Reference (original) (raw)
This is an alternative analysis pass to BranchProbabilityInfoWrapperPass. More...
#include "[llvm/Analysis/LazyBranchProbabilityInfo.h](LazyBranchProbabilityInfo%5F8h%5Fsource.html)"
| Public Member Functions | |
|---|---|
| LazyBranchProbabilityInfoPass () | |
| BranchProbabilityInfo & | getBPI () |
| Compute and return the branch probabilities. | |
| const BranchProbabilityInfo & | getBPI () const |
| Compute and return the branch probabilities. | |
| void | getAnalysisUsage (AnalysisUsage &AU) const override |
| getAnalysisUsage - This function should be overriden by passes that need analysis information to do their job. | |
| bool | runOnFunction (Function &F) override |
| runOnFunction - Virtual method overriden by subclasses to do the per-function processing of the pass. | |
| void | releaseMemory () override |
| releaseMemory() - This member can be implemented by a pass if it wants to be able to release its memory when it is no longer needed. | |
| void | print (raw_ostream &OS, const Module *M) const override |
| print - Print out the internal state of the pass. | |
| Public Member Functions inherited from llvm::FunctionPass | |
| FunctionPass (char &pid) | |
| Pass * | createPrinterPass (raw_ostream &OS, const std::string &Banner) const override |
| createPrinterPass - Get a function printer pass. | |
| void | assignPassManager (PMStack &PMS, PassManagerType T) override |
| Find appropriate Function Pass Manager or Call Graph Pass Manager in the PM Stack and add self into that manager. | |
| PassManagerType | getPotentialPassManagerType () const override |
| Return what kind of Pass Manager can manage this pass. | |
| Public Member Functions inherited from llvm::Pass | |
| Pass (PassKind K, char &pid) | |
| Pass (const Pass &)=delete | |
| Pass & | operator= (const Pass &)=delete |
| virtual | ~Pass () |
| PassKind | getPassKind () const |
| virtual StringRef | getPassName () const |
| getPassName - Return a nice clean name for a pass. | |
| StringRef | getPassArgument () const |
| Return a nice clean name for a pass corresponding to that used to enable the pass in opt. | |
| AnalysisID | getPassID () const |
| getPassID - Return the PassID number that corresponds to this pass. | |
| virtual bool | doInitialization (Module &) |
| doInitialization - Virtual method overridden by subclasses to do any necessary initialization before any pass is run. | |
| virtual bool | doFinalization (Module &) |
| doFinalization - Virtual method overriden by subclasses to do any necessary clean up after all passes have run. | |
| void | dump () const |
| virtual void | preparePassManager (PMStack &) |
| Check if available pass managers are suitable for this pass or not. | |
| void | setResolver (AnalysisResolver *AR) |
| AnalysisResolver * | getResolver () const |
| virtual ImmutablePass * | getAsImmutablePass () |
| virtual PMDataManager * | getAsPMDataManager () |
| virtual void | verifyAnalysis () const |
| verifyAnalysis() - This member can be implemented by a analysis pass to check state of analysis information. | |
| virtual void | dumpPassStructure (unsigned Offset=0) |
| template | |
| AnalysisType * | getAnalysisIfAvailable () const |
| getAnalysisIfAvailable() - Subclasses use this function to get analysis information that might be around, for example to update it. | |
| bool | mustPreserveAnalysisID (char &AID) const |
| mustPreserveAnalysisID - This method serves the same function as getAnalysisIfAvailable, but works if you just have an AnalysisID. | |
| template | |
| AnalysisType & | getAnalysis () const |
| getAnalysis() - This function is used by subclasses to get to the analysis information that they claim to use by overriding the getAnalysisUsage function. | |
| template | |
| AnalysisType & | getAnalysis (Function &F, bool *Changed=nullptr) |
| getAnalysis() - This function is used by subclasses to get to the analysis information that they claim to use by overriding the getAnalysisUsage function. | |
| template | |
| AnalysisType & | getAnalysisID (AnalysisID PI) const |
| template | |
| AnalysisType & | getAnalysisID (AnalysisID PI, Function &F, bool *Changed=nullptr) |
| Static Public Member Functions | |
|---|---|
| static void | getLazyBPIAnalysisUsage (AnalysisUsage &AU) |
| Helper for client passes to set up the analysis usage on behalf of this pass. | |
| Static Public Member Functions inherited from llvm::Pass | |
| static const PassInfo * | lookupPassInfo (const void *TI) |
| static const PassInfo * | lookupPassInfo (StringRef Arg) |
| static Pass * | createPass (AnalysisID ID) |
| Static Public Attributes | |
|---|---|
| static char | ID = 0 |
This is an alternative analysis pass to BranchProbabilityInfoWrapperPass.
The difference is that with this pass the branch probabilities are not computed when the analysis pass is executed but rather when the BPI results is explicitly requested by the analysis client.
There are some additional requirements for any client pass that wants to use the analysis:
- The pass needs to initialize dependent passes with:
INITIALIZE_PASS_DEPENDENCY(LazyBPIPass) - Similarly, getAnalysisUsage should call:
LazyBranchProbabilityInfoPass::getLazyBPIAnalysisUsage(AU) - The computed BPI should be requested with getAnalysis().getBPI() before LoopInfo could be invalidated for example by changing the CFG.
Note that it is expected that we wouldn't need this functionality for the new PM since with the new PM, analyses are executed on demand.
Definition at line 49 of file LazyBranchProbabilityInfo.h.
| LazyBranchProbabilityInfoPass::LazyBranchProbabilityInfoPass | ( | ) |
|---|
◆ getAnalysisUsage()
| void LazyBranchProbabilityInfoPass::getAnalysisUsage ( AnalysisUsage & ) const | overridevirtual |
|---|
◆ getBPI() [1/2]
◆ getBPI() [2/2]
◆ getLazyBPIAnalysisUsage()
| void LazyBranchProbabilityInfoPass::getLazyBPIAnalysisUsage ( AnalysisUsage & AU) | static |
|---|
◆ print()
print - Print out the internal state of the pass.
This is called by Analyze to print out the contents of an analysis. Otherwise it is not necessary to implement this method. Beware that the module pointer MAY be null. This automatically forwards to a virtual function that does not provide the Module* in case the analysis doesn't need it it can just be ignored.
Reimplemented from llvm::Pass.
Definition at line 40 of file LazyBranchProbabilityInfo.cpp.
◆ releaseMemory()
| void LazyBranchProbabilityInfoPass::releaseMemory ( ) | overridevirtual |
|---|
releaseMemory() - This member can be implemented by a pass if it wants to be able to release its memory when it is no longer needed.
The default behavior of passes is to hold onto memory for the entire duration of their lifetime (which is the entire compile time). For pipelined passes, this is not a big deal because that memory gets recycled every time the pass is invoked on another program unit. For IP passes, it is more important to free memory when it is unused.
Optionally implement this function to release pass memory when it is no longer used.
Reimplemented from llvm::Pass.
Definition at line 55 of file LazyBranchProbabilityInfo.cpp.
◆ runOnFunction()
| bool LazyBranchProbabilityInfoPass::runOnFunction ( Function & F) | overridevirtual |
|---|
◆ ID
| Lazy Branch Probability true char LazyBranchProbabilityInfoPass::ID = 0 | static |
|---|
The documentation for this class was generated from the following files:
- include/llvm/Analysis/LazyBranchProbabilityInfo.h
- lib/Analysis/LazyBranchProbabilityInfo.cpp