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LLVM
3.7.0
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A set of live physical registers with functions to track liveness when walking backward/forward through a basic block. More...
#include <LivePhysRegs.h>
Public Types | |
| typedef SparseSet< unsigned > ::const_iterator | const_iterator |
Public Member Functions | |
| LivePhysRegs () | |
| Constructs a new empty LivePhysRegs set. More... | |
| LivePhysRegs (const TargetRegisterInfo *TRI) | |
| Constructs and initialize an empty LivePhysRegs set. More... | |
| void | init (const TargetRegisterInfo *TRI) |
| Clear and initialize the LivePhysRegs set. More... | |
| void | clear () |
| Clears the LivePhysRegs set. More... | |
| bool | empty () const |
| Returns true if the set is empty. More... | |
| void | addReg (unsigned Reg) |
| Adds a physical register and all its sub-registers to the set. More... | |
| void | removeReg (unsigned Reg) |
| Removes a physical register, all its sub-registers, and all its super-registers from the set. More... | |
| void | removeRegsInMask (const MachineOperand &MO, SmallVectorImpl< std::pair< unsigned, const MachineOperand * >> *Clobbers) |
Removes physical registers clobbered by the regmask operand MO. More... | |
| bool | contains (unsigned Reg) const |
Returns true if register Reg is contained in the set. More... | |
| void | stepBackward (const MachineInstr &MI) |
| Simulates liveness when stepping backwards over an instruction(bundle): Remove Defs, add uses. More... | |
| void | stepForward (const MachineInstr &MI, SmallVectorImpl< std::pair< unsigned, const MachineOperand * >> &Clobbers) |
| Simulates liveness when stepping forward over an instruction(bundle): Remove killed-uses, add defs. More... | |
| void | addLiveIns (const MachineBasicBlock *MBB, bool AddPristines=false) |
Adds all live-in registers of basic block MBB; After prologue/ epilogue insertion AddPristines should be set to true to insert the pristine registers. More... | |
| void | addLiveOuts (const MachineBasicBlock *MBB, bool AddPristines=false) |
Adds all live-out registers of basic block MBB; After prologue/ epilogue insertion AddPristines should be set to true to insert the pristine registers. More... | |
| const_iterator | begin () const |
| const_iterator | end () const |
| void | print (raw_ostream &OS) const |
Prints the currently live registers to OS. More... | |
| void | dump () const |
| Dumps the currently live registers to the debug output. More... | |
A set of live physical registers with functions to track liveness when walking backward/forward through a basic block.
Definition at line 43 of file LivePhysRegs.h.
Definition at line 129 of file LivePhysRegs.h.
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Constructs a new empty LivePhysRegs set.
Definition at line 51 of file LivePhysRegs.h.
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Constructs and initialize an empty LivePhysRegs set.
Definition at line 54 of file LivePhysRegs.h.
References llvm::MCRegisterInfo::getNumRegs(), and llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::setUniverse().
| void LivePhysRegs::addLiveIns | ( | const MachineBasicBlock * | MBB, |
| bool | AddPristines = false |
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Adds all live-in registers of basic block MBB; After prologue/ epilogue insertion AddPristines should be set to true to insert the pristine registers.
Definition at line 159 of file LivePhysRegs.cpp.
References addPristines(), and llvm::MachineBasicBlock::getParent().
Referenced by addLiveOuts().
| void LivePhysRegs::addLiveOuts | ( | const MachineBasicBlock * | MBB, |
| bool | AddPristines = false |
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Adds all live-out registers of basic block MBB; After prologue/ epilogue insertion AddPristines should be set to true to insert the pristine registers.
Definition at line 149 of file LivePhysRegs.cpp.
References addLiveIns(), addPristines(), llvm::MachineBasicBlock::getParent(), and llvm::MachineBasicBlock::successors().
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Adds a physical register and all its sub-registers to the set.
Definition at line 74 of file LivePhysRegs.h.
References llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::insert(), and llvm::MCRegisterInfo::DiffListIterator::isValid().
Referenced by addLiveIns(), addPristines(), stepBackward(), and stepForward().
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Definition at line 130 of file LivePhysRegs.h.
References llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::begin().
Referenced by print().
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Clears the LivePhysRegs set.
Definition at line 68 of file LivePhysRegs.h.
References llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::clear().
Returns true if register Reg is contained in the set.
This also works if only the super register of Reg has been defined, because we always add also all sub-registers to the set.
Definition at line 102 of file LivePhysRegs.h.
References llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::count().
Referenced by RemoveKills(), and UpdatePredRedefs().
| void LivePhysRegs::dump | ( | ) | const |
Dumps the currently live registers to the debug output.
Definition at line 123 of file LivePhysRegs.cpp.
References llvm::dbgs().
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Returns true if the set is empty.
Definition at line 71 of file LivePhysRegs.h.
References llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::empty().
Referenced by print().
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Definition at line 131 of file LivePhysRegs.h.
References llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::end().
Referenced by print().
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Clear and initialize the LivePhysRegs set.
Definition at line 60 of file LivePhysRegs.h.
References llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::clear(), llvm::MCRegisterInfo::getNumRegs(), and llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::setUniverse().
| void LivePhysRegs::print | ( | raw_ostream & | OS | ) | const |
Prints the currently live registers to OS.
Prin the currently live registers to OS.
Definition at line 105 of file LivePhysRegs.cpp.
References begin(), empty(), end(), and I.
Referenced by llvm::operator<<().
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Removes a physical register, all its sub-registers, and all its super-registers from the set.
Definition at line 84 of file LivePhysRegs.h.
References llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::erase(), and llvm::MCRegisterInfo::DiffListIterator::isValid().
Referenced by addPristines(), stepBackward(), and stepForward().
| void LivePhysRegs::removeRegsInMask | ( | const MachineOperand & | MO, |
| SmallVectorImpl< std::pair< unsigned, const MachineOperand * >> * | Clobbers | ||
| ) |
Removes physical registers clobbered by the regmask operand MO.
Remove all registers from the set that get clobbered by the register mask.
The clobbers set will be the list of live registers clobbered by the regmask.
Definition at line 29 of file LivePhysRegs.cpp.
References llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::begin(), llvm::MachineOperand::clobbersPhysReg(), llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::end(), and llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::erase().
Referenced by stepBackward(), and stepForward().
| void LivePhysRegs::stepBackward | ( | const MachineInstr & | MI | ) |
Simulates liveness when stepping backwards over an instruction(bundle): Remove Defs, add uses.
This is the recommended way of calculating liveness.
Definition at line 44 of file LivePhysRegs.cpp.
References addReg(), llvm::MachineOperandIteratorBase::isValid(), removeReg(), and removeRegsInMask().
| void LivePhysRegs::stepForward | ( | const MachineInstr & | MI, |
| SmallVectorImpl< std::pair< unsigned, const MachineOperand * >> & | Clobbers | ||
| ) |
Simulates liveness when stepping forward over an instruction(bundle): Remove killed-uses, add defs.
This is the not recommended way, because it depends on accurate kill flags. If possible use stepBackwards() instead of this function. The clobbers set will be the list of registers either defined or clobbered by a regmask. The operand will identify whether this is a regmask or register operand.
This is the not recommended way, because it depends on accurate kill flags. If possible use stepBackwards() instead of this function.
Definition at line 73 of file LivePhysRegs.cpp.
References addReg(), llvm::MachineOperandIteratorBase::isValid(), removeReg(), and removeRegsInMask().
Referenced by UpdatePredRedefs().
1.8.6