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Convert liveness tracking to work on a sub-register level instead of just register units.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197253 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2013-12-13 18:36:56 +00:00
parent 513a00db78
commit edf1070ca7
7 changed files with 241 additions and 234 deletions
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include/llvm/CodeGen/LivePhysRegs.h
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//===- llvm/CodeGen/LivePhysRegs.h - Live Physical Register Set -*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements a set of live physical registers. This can be used for
// ad hoc liveness tracking after register allocation. You can start with the
// live-ins/live-outs at the beginning/end of a block and update the information
// while walking the instructions inside the block.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_LIVE_PHYS_REGS_H
#define LLVM_CODEGEN_LIVE_PHYS_REGS_H
#include "llvm/ADT/SparseSet.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/Target/TargetRegisterInfo.h"
#include <cassert>
namespace llvm {
class MachineInstr;
/// \brief A set of live physical registers with functions to track liveness
/// when walking backward/forward through a basic block.
class LivePhysRegs {
const TargetRegisterInfo *TRI;
SparseSet<unsigned> LiveRegs;
LivePhysRegs(const LivePhysRegs&) LLVM_DELETED_FUNCTION;
LivePhysRegs &operator=(const LivePhysRegs&) LLVM_DELETED_FUNCTION;
public:
/// \brief Constructs a new empty LivePhysRegs set.
LivePhysRegs() : TRI(0), LiveRegs() {}
/// \brief Constructs and initialize an empty LivePhysRegs set.
LivePhysRegs(const TargetRegisterInfo *TRI) : TRI(TRI) {
LiveRegs.setUniverse(TRI->getNumRegs());
}
/// \brief Clear and initialize the LivePhysRegs set.
void init(const TargetRegisterInfo *_TRI) {
TRI = _TRI;
LiveRegs.clear();
LiveRegs.setUniverse(TRI->getNumRegs());
}
/// \brief Clears the LivePhysRegs set.
void clear() { LiveRegs.clear(); }
/// \brief Returns true if the set is empty.
bool empty() const { return LiveRegs.empty(); }
/// \brief Adds a physical register and all its sub-registers to the set.
void addReg(unsigned Reg) {
assert(TRI && "LivePhysRegs is not initialized.");
for (MCSubRegIterator SubRegs(Reg, TRI, /*IncludeSelf=*/true);
SubRegs.isValid(); ++SubRegs)
LiveRegs.insert(*SubRegs);
}
/// \brief Removes a physical register, all its sub-registers, and all its
/// super-registers from the set.
void removeReg(unsigned Reg) {
assert(TRI && "LivePhysRegs is not initialized.");
for (MCSubRegIterator SubRegs(Reg, TRI, /*IncludeSelf=*/true);
SubRegs.isValid(); ++SubRegs)
LiveRegs.erase(*SubRegs);
for (MCSuperRegIterator SuperRegs(Reg, TRI, /*IncludeSelf=*/false);
SuperRegs.isValid(); ++SuperRegs)
LiveRegs.erase(*SuperRegs);
}
/// \brief Removes physical registers clobbered by the regmask operand @p MO.
void removeRegsInMask(const MachineOperand &MO);
/// \brief Returns true if register @p Reg is contained in the set. This also
/// works if only the super register of @p Reg has been defined, because we
/// always add also all sub-registers to the set.
bool contains(unsigned Reg) const { return LiveRegs.count(Reg); }
/// \brief Simulates liveness when stepping backwards over an
/// instruction(bundle): Remove Defs, add uses. This is the recommended way of
/// calculating liveness.
void stepBackward(const MachineInstr &MI);
/// \brief 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.
void stepForward(const MachineInstr &MI);
/// \brief Adds all live-in registers of basic block @p MBB.
void addLiveIns(const MachineBasicBlock *MBB) {
for (MachineBasicBlock::livein_iterator LI = MBB->livein_begin(),
LE = MBB->livein_end(); LI != LE; ++LI)
addReg(*LI);
}
/// \brief Adds all live-out registers of basic block @p MBB.
void addLiveOuts(const MachineBasicBlock *MBB) {
for (MachineBasicBlock::const_succ_iterator SI = MBB->succ_begin(),
SE = MBB->succ_end(); SI != SE; ++SI)
addLiveIns(*SI);
}
typedef SparseSet<unsigned>::const_iterator const_iterator;
const_iterator begin() const { return LiveRegs.begin(); }
const_iterator end() const { return LiveRegs.end(); }
};
} // namespace llvm
#endif
include/llvm/CodeGen/LiveRegUnits.h
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//===-- llvm/CodeGen/LiveRegUnits.h - Live register unit set ----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements a Set of live register units. This can be used for ad
// hoc liveness tracking after register allocation. You can start with the
// live-ins/live-outs at the beginning/end of a block and update the information
// while walking the instructions inside the block.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_LIVEREGUNITS_H
#define LLVM_CODEGEN_LIVEREGUNITS_H
#include "llvm/ADT/SparseSet.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/Target/TargetRegisterInfo.h"
#include <cassert>
namespace llvm {
class MachineInstr;
/// A set of live register units with functions to track liveness when walking
/// backward/forward through a basic block.
class LiveRegUnits {
SparseSet<unsigned> LiveUnits;
LiveRegUnits(const LiveRegUnits&) LLVM_DELETED_FUNCTION;
LiveRegUnits &operator=(const LiveRegUnits&) LLVM_DELETED_FUNCTION;
public:
/// \brief Constructs a new empty LiveRegUnits set.
LiveRegUnits() {}
void init(const TargetRegisterInfo *TRI) {
LiveUnits.clear();
LiveUnits.setUniverse(TRI->getNumRegs());
}
void clear() { LiveUnits.clear(); }
bool empty() const { return LiveUnits.empty(); }
/// \brief Adds a register to the set.
void addReg(unsigned Reg, const MCRegisterInfo &MCRI) {
for (MCRegUnitIterator RUnits(Reg, &MCRI); RUnits.isValid(); ++RUnits)
LiveUnits.insert(*RUnits);
}
/// \brief Removes a register from the set.
void removeReg(unsigned Reg, const MCRegisterInfo &MCRI) {
for (MCRegUnitIterator RUnits(Reg, &MCRI); RUnits.isValid(); ++RUnits)
LiveUnits.erase(*RUnits);
}
/// \brief Removes registers clobbered by the regmask operand @p Op.
void removeRegsInMask(const MachineOperand &Op, const MCRegisterInfo &MCRI);
/// \brief Returns true if register @p Reg (or one of its super register) is
/// contained in the set.
bool contains(unsigned Reg, const MCRegisterInfo &MCRI) const {
for (MCRegUnitIterator RUnits(Reg, &MCRI); RUnits.isValid(); ++RUnits) {
if (LiveUnits.count(*RUnits))
return true;
}
return false;
}
/// \brief Simulates liveness when stepping backwards over an
/// instruction(bundle): Remove Defs, add uses.
void stepBackward(const MachineInstr &MI, const MCRegisterInfo &MCRI);
/// \brief Simulates liveness when stepping forward over an
/// instruction(bundle): Remove killed-uses, add defs.
void stepForward(const MachineInstr &MI, const MCRegisterInfo &MCRI);
/// \brief Adds all registers in the live-in list of block @p BB.
void addLiveIns(const MachineBasicBlock *MBB, const MCRegisterInfo &MCRI);
};
} // namespace llvm
#endif