LLVM 22.0.0git
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RABasic provides a minimal implementation of the basic register allocation algorithm. More...
#include "CodeGen/RegAllocBasic.h"
Public Member Functions | |
RABasic (const RegAllocFilterFunc F=nullptr) | |
StringRef | getPassName () const override |
Return the pass name. | |
void | getAnalysisUsage (AnalysisUsage &AU) const override |
RABasic analysis usage. | |
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. | |
Spiller & | spiller () override |
void | enqueueImpl (const LiveInterval *LI) override |
enqueue - Add VirtReg to the priority queue of unassigned registers. | |
const LiveInterval * | dequeue () override |
dequeue - Return the next unassigned register, or NULL. | |
MCRegister | selectOrSplit (const LiveInterval &VirtReg, SmallVectorImpl< Register > &SplitVRegs) override |
bool | runOnMachineFunction (MachineFunction &mf) override |
Perform register allocation. | |
MachineFunctionProperties | getRequiredProperties () const override |
MachineFunctionProperties | getClearedProperties () const override |
bool | spillInterferences (const LiveInterval &VirtReg, MCRegister PhysReg, SmallVectorImpl< Register > &SplitVRegs) |
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bool | doInitialization (Module &) override |
doInitialization - Virtual method overridden by subclasses to do any necessary initialization before any pass is run. | |
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FunctionPass (char &pid) | |
Pass * | createPrinterPass (raw_ostream &OS, const std::string &Banner) const override |
createPrinterPass - Get a function printer pass. | |
virtual bool | runOnFunction (Function &F)=0 |
runOnFunction - Virtual method overriden by subclasses to do the per-function processing of the 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. | |
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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. | |
virtual void | print (raw_ostream &OS, const Module *M) const |
print - Print out the internal state of the pass. | |
void | dump () const |
virtual Pass * | createPrinterPass (raw_ostream &OS, const std::string &Banner) const =0 |
createPrinterPass - Get a Pass appropriate to print the IR this pass operates on (Module, Function or MachineFunction). | |
virtual void | assignPassManager (PMStack &, PassManagerType) |
Each pass is responsible for assigning a pass manager to itself. | |
virtual void | preparePassManager (PMStack &) |
Check if available pass managers are suitable for this pass or not. | |
virtual PassManagerType | getPotentialPassManagerType () const |
Return what kind of Pass Manager can manage this pass. | |
void | setResolver (AnalysisResolver *AR) |
AnalysisResolver * | getResolver () const |
virtual void | getAnalysisUsage (AnalysisUsage &) const |
getAnalysisUsage - This function should be overriden by passes that need analysis information to do their job. | |
virtual void | releaseMemory () |
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. | |
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<typename AnalysisType > | |
AnalysisType * | getAnalysisIfAvailable () const |
getAnalysisIfAvailable<AnalysisType>() - 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<typename AnalysisType > | |
AnalysisType & | getAnalysis () const |
getAnalysis<AnalysisType>() - This function is used by subclasses to get to the analysis information that they claim to use by overriding the getAnalysisUsage function. | |
template<typename AnalysisType > | |
AnalysisType & | getAnalysis (Function &F, bool *Changed=nullptr) |
getAnalysis<AnalysisType>() - This function is used by subclasses to get to the analysis information that they claim to use by overriding the getAnalysisUsage function. | |
template<typename AnalysisType > | |
AnalysisType & | getAnalysisID (AnalysisID PI) const |
template<typename AnalysisType > | |
AnalysisType & | getAnalysisID (AnalysisID PI, Function &F, bool *Changed=nullptr) |
Static Public Attributes | |
static char | ID = 0 |
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static bool | VerifyEnabled = false |
VerifyEnabled - True when -verify-regalloc is given. | |
Additional Inherited Members | |
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static const PassInfo * | lookupPassInfo (const void *TI) |
static const PassInfo * | lookupPassInfo (StringRef Arg) |
static Pass * | createPass (AnalysisID ID) |
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MachineFunctionPass (char &ID) | |
virtual bool | runOnMachineFunction (MachineFunction &MF)=0 |
runOnMachineFunction - This method must be overloaded to perform the desired machine code transformation or analysis. | |
void | getAnalysisUsage (AnalysisUsage &AU) const override |
getAnalysisUsage - Subclasses that override getAnalysisUsage must call this. | |
virtual MachineFunctionProperties | getRequiredProperties () const |
virtual MachineFunctionProperties | getSetProperties () const |
virtual MachineFunctionProperties | getClearedProperties () const |
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bool | skipFunction (const Function &F) const |
Optional passes call this function to check whether the pass should be skipped. | |
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RegAllocBase (const RegAllocFilterFunc F=nullptr) | |
virtual | ~RegAllocBase ()=default |
void | init (VirtRegMap &vrm, LiveIntervals &lis, LiveRegMatrix &mat) |
bool | shouldAllocateRegister (Register Reg) |
Get whether a given register should be allocated. | |
void | allocatePhysRegs () |
virtual void | postOptimization () |
void | cleanupFailedVReg (Register FailedVReg, MCRegister PhysReg, SmallVectorImpl< Register > &SplitRegs) |
Perform cleanups on registers that failed to allocate. | |
virtual Spiller & | spiller ()=0 |
virtual void | enqueueImpl (const LiveInterval *LI)=0 |
enqueue - Add VirtReg to the priority queue of unassigned registers. | |
void | enqueue (const LiveInterval *LI) |
enqueue - Add VirtReg to the priority queue of unassigned registers. | |
virtual const LiveInterval * | dequeue ()=0 |
dequeue - Return the next unassigned register, or NULL. | |
virtual MCRegister | selectOrSplit (const LiveInterval &VirtReg, SmallVectorImpl< Register > &splitLVRs)=0 |
MCPhysReg | getErrorAssignment (const TargetRegisterClass &RC, const MachineInstr *CtxMI=nullptr) |
Query a physical register to use as a filler in contexts where the allocation has failed. | |
virtual void | aboutToRemoveInterval (const LiveInterval &LI) |
Method called when the allocator is about to remove a LiveInterval. | |
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const TargetRegisterInfo * | TRI = nullptr |
MachineRegisterInfo * | MRI = nullptr |
VirtRegMap * | VRM = nullptr |
LiveIntervals * | LIS = nullptr |
LiveRegMatrix * | Matrix = nullptr |
RegisterClassInfo | RegClassInfo |
SmallPtrSet< MachineInstr *, 32 > | DeadRemats |
Inst which is a def of an original reg and whose defs are already all dead after remat is saved in DeadRemats. | |
SmallSet< Register, 2 > | FailedVRegs |
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static const char | TimerGroupName [] = "regalloc" |
static const char | TimerGroupDescription [] = "Register Allocation" |
RABasic provides a minimal implementation of the basic register allocation algorithm.
It prioritizes live virtual registers by spill weight and spills whenever a register is unavailable. This is not practical in production but provides a useful baseline both for measuring other allocators and comparing the speed of the basic algorithm against other styles of allocators.
Definition at line 37 of file RegAllocBasic.h.
RABasic::RABasic | ( | const RegAllocFilterFunc | F = nullptr | ) |
Definition at line 87 of file RegAllocBasic.cpp.
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inlineoverridevirtual |
dequeue - Return the next unassigned register, or NULL.
Implements llvm::RegAllocBase.
Definition at line 71 of file RegAllocBasic.h.
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inlineoverridevirtual |
enqueue - Add VirtReg to the priority queue of unassigned registers.
Implements llvm::RegAllocBase.
Definition at line 69 of file RegAllocBasic.h.
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overridevirtual |
RABasic analysis usage.
Reimplemented from llvm::MachineFunctionPass.
Definition at line 90 of file RegAllocBasic.cpp.
References llvm::AnalysisUsage::addPreserved(), llvm::AnalysisUsage::addPreservedID(), llvm::AnalysisUsage::addRequired(), llvm::AnalysisUsage::addRequiredID(), llvm::MachineFunctionPass::getAnalysisUsage(), llvm::MachineDominatorsID, and llvm::AnalysisUsage::setPreservesCFG().
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inlineoverridevirtual |
Reimplemented from llvm::MachineFunctionPass.
Definition at line 90 of file RegAllocBasic.h.
References llvm::MachineFunctionProperties::set().
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inlineoverridevirtual |
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inlineoverridevirtual |
Reimplemented from llvm::MachineFunctionPass.
Definition at line 85 of file RegAllocBasic.h.
References llvm::MachineFunctionProperties::set().
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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 116 of file RegAllocBasic.cpp.
Referenced by runOnMachineFunction().
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overridevirtual |
Perform register allocation.
Implements llvm::MachineFunctionPass.
Definition at line 223 of file RegAllocBasic.cpp.
References llvm::RegAllocBase::allocatePhysRegs(), llvm::VirtRegAuxInfo::calculateSpillWeightsAndHints(), llvm::createInlineSpiller(), llvm::dbgs(), llvm::MachineFunction::getName(), llvm::RegAllocBase::init(), llvm::RegAllocBase::LIS, LLVM_DEBUG, llvm::RegAllocBase::postOptimization(), releaseMemory(), and llvm::RegAllocBase::VRM.
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overridevirtual |
Implements llvm::RegAllocBase.
Definition at line 173 of file RegAllocBasic.cpp.
References assert(), llvm::LiveRegMatrix::checkInterference(), llvm::AllocationOrder::create(), llvm::dbgs(), llvm::RegAllocBase::DeadRemats, llvm::LiveRegMatrix::IK_Free, llvm::LiveRegMatrix::IK_VirtReg, llvm::LiveInterval::isSpillable(), llvm::RegAllocBase::LIS, LLVM_DEBUG, llvm::RegAllocBase::Matrix, llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::LiveInterval::reg(), llvm::RegAllocBase::RegClassInfo, llvm::Spiller::spill(), spiller(), spillInterferences(), and llvm::RegAllocBase::VRM.
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inlineoverridevirtual |
Implements llvm::RegAllocBase.
Definition at line 67 of file RegAllocBasic.h.
Referenced by selectOrSplit(), and spillInterferences().
bool RABasic::spillInterferences | ( | const LiveInterval & | VirtReg, |
MCRegister | PhysReg, | ||
SmallVectorImpl< Register > & | SplitVRegs | ||
) |
Definition at line 124 of file RegAllocBasic.cpp.
References assert(), llvm::dbgs(), llvm::RegAllocBase::DeadRemats, llvm::SmallVectorBase< Size_T >::empty(), llvm::VirtRegMap::hasPhys(), llvm::LiveIntervalUnion::Query::interferingVRegs(), llvm::RegAllocBase::LIS, LLVM_DEBUG, llvm::RegAllocBase::Matrix, llvm::printReg(), llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::LiveRegMatrix::query(), llvm::MCRegisterInfo::regunits(), llvm::reverse(), llvm::Spiller::spill(), spiller(), llvm::RegAllocBase::TRI, llvm::LiveRegMatrix::unassign(), llvm::RegAllocBase::VRM, and llvm::LiveInterval::weight().
Referenced by selectOrSplit().
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static |
Definition at line 101 of file RegAllocBasic.h.