#ifndef LLVM_CODEGEN_LIVEVARIABLES_H
#define LLVM_CODEGEN_LIVEVARIABLES_H
+#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/ADT/BitVector.h"
+#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/SmallVector.h"
-#include <map>
+#include "llvm/ADT/SparseBitVector.h"
namespace llvm {
+class MachineRegisterInfo;
class TargetRegisterInfo;
class LiveVariables : public MachineFunctionPass {
public:
static char ID; // Pass identification, replacement for typeid
- LiveVariables() : MachineFunctionPass((intptr_t)&ID) {}
+ LiveVariables() : MachineFunctionPass(&ID) {}
/// VarInfo - This represents the regions where a virtual register is live in
/// the program. We represent this with three different pieces of
- /// information: the instruction that uniquely defines the value, the set of
- /// blocks the instruction is live into and live out of, and the set of
- /// non-phi instructions that are the last users of the value.
+ /// information: the set of blocks in which the instruction is live
+ /// throughout, the set of blocks in which the instruction is actually used,
+ /// and the set of non-phi instructions that are the last users of the value.
///
/// In the common case where a value is defined and killed in the same block,
- /// DefInst is the defining inst, there is one killing instruction, and
- /// AliveBlocks is empty.
+ /// There is one killing instruction, and AliveBlocks is empty.
///
/// Otherwise, the value is live out of the block. If the value is live
- /// across any blocks, these blocks are listed in AliveBlocks. Blocks where
- /// the liveness range ends are not included in AliveBlocks, instead being
- /// captured by the Kills set. In these blocks, the value is live into the
- /// block (unless the value is defined and killed in the same block) and lives
- /// until the specified instruction. Note that there cannot ever be a value
- /// whose Kills set contains two instructions from the same basic block.
+ /// throughout any blocks, these blocks are listed in AliveBlocks. Blocks
+ /// where the liveness range ends are not included in AliveBlocks, instead
+ /// being captured by the Kills set. In these blocks, the value is live into
+ /// the block (unless the value is defined and killed in the same block) and
+ /// lives until the specified instruction. Note that there cannot ever be a
+ /// value whose Kills set contains two instructions from the same basic block.
///
/// PHI nodes complicate things a bit. If a PHI node is the last user of a
/// value in one of its predecessor blocks, it is not listed in the kills set,
/// but does include the predecessor block in the AliveBlocks set (unless that
/// block also defines the value). This leads to the (perfectly sensical)
/// situation where a value is defined in a block, and the last use is a phi
- /// node in the successor. In this case, DefInst will be the defining
- /// instruction, AliveBlocks is empty (the value is not live across any
- /// blocks) and Kills is empty (phi nodes are not included). This is sensical
- /// because the value must be live to the end of the block, but is not live in
- /// any successor blocks.
+ /// node in the successor. In this case, AliveBlocks is empty (the value is
+ /// not live across any blocks) and Kills is empty (phi nodes are not
+ /// included). This is sensical because the value must be live to the end of
+ /// the block, but is not live in any successor blocks.
struct VarInfo {
- /// DefInst - The machine instruction that defines this register.
- ///
- MachineInstr *DefInst;
-
- /// AliveBlocks - Set of blocks of which this value is alive completely
+ /// AliveBlocks - Set of blocks in which this value is alive completely
/// through. This is a bit set which uses the basic block number as an
/// index.
///
- BitVector AliveBlocks;
-
- /// UsedBlocks - Set of blocks of which this value is actually used. This
- /// is a bit set which uses the basic block number as an index.
- BitVector UsedBlocks;
+ SparseBitVector<> AliveBlocks;
/// NumUses - Number of uses of this register across the entire function.
///
///
std::vector<MachineInstr*> Kills;
- VarInfo() : DefInst(0), NumUses(0) {}
+ VarInfo() : NumUses(0) {}
/// removeKill - Delete a kill corresponding to the specified
/// machine instruction. Returns true if there was a kill
/// corresponding to this instruction, false otherwise.
bool removeKill(MachineInstr *MI) {
- for (std::vector<MachineInstr*>::iterator i = Kills.begin(),
- e = Kills.end(); i != e; ++i)
- if (*i == MI) {
- Kills.erase(i);
- return true;
- }
- return false;
+ std::vector<MachineInstr*>::iterator
+ I = std::find(Kills.begin(), Kills.end(), MI);
+ if (I == Kills.end())
+ return false;
+ Kills.erase(I);
+ return true;
}
-
+
+ /// findKill - Find a kill instruction in MBB. Return NULL if none is found.
+ MachineInstr *findKill(const MachineBasicBlock *MBB) const;
+
+ /// isLiveIn - Is Reg live in to MBB? This means that Reg is live through
+ /// MBB, or it is killed in MBB. If Reg is only used by PHI instructions in
+ /// MBB, it is not considered live in.
+ bool isLiveIn(const MachineBasicBlock &MBB,
+ unsigned Reg,
+ MachineRegisterInfo &MRI);
+
void dump() const;
};
///
std::vector<VarInfo> VirtRegInfo;
+ /// PHIJoins - list of virtual registers that are PHI joins. These registers
+ /// may have multiple definitions, and they require special handling when
+ /// building live intervals.
+ SparseBitVector<> PHIJoins;
+
/// ReservedRegisters - This vector keeps track of which registers
/// are reserved register which are not allocatable by the target machine.
/// We can not track liveness for values that are in this set.
private: // Intermediate data structures
MachineFunction *MF;
- const TargetRegisterInfo *RegInfo;
+ MachineRegisterInfo* MRI;
+
+ const TargetRegisterInfo *TRI;
- // PhysRegInfo - Keep track of which instruction was the last def/use of a
+ // PhysRegInfo - Keep track of which instruction was the last def of a
// physical register. This is a purely local property, because all physical
// register references are presumed dead across basic blocks.
- MachineInstr **PhysRegInfo;
-
- // PhysRegUsed - Keep track of whether the physical register has been used
- // after its last definition. This is local property.
- bool *PhysRegUsed;
-
- // PhysRegPartUse - Keep track of which instruction was the last partial use
- // of a physical register (e.g. on X86 a def of EAX followed by a use of AX).
- // This is a purely local property.
- MachineInstr **PhysRegPartUse;
+ MachineInstr **PhysRegDef;
- // PhysRegPartDef - Keep track of a list of instructions which "partially"
- // defined the physical register (e.g. on X86 AX partially defines EAX).
- // These are turned into use/mod/write if there is a use of the register
- // later in the same block. This is local property.
- SmallVector<MachineInstr*, 4> *PhysRegPartDef;
+ // PhysRegInfo - Keep track of which instruction was the last use of a
+ // physical register. This is a purely local property, because all physical
+ // register references are presumed dead across basic blocks.
+ MachineInstr **PhysRegUse;
SmallVector<unsigned, 4> *PHIVarInfo;
- void addRegisterKills(unsigned Reg, MachineInstr *MI,
- SmallSet<unsigned, 4> &SubKills);
+ // DistanceMap - Keep track the distance of a MI from the start of the
+ // current basic block.
+ DenseMap<MachineInstr*, unsigned> DistanceMap;
/// HandlePhysRegKill - Add kills of Reg and its sub-registers to the
/// uses. Pay special attention to the sub-register uses which may come below
/// the last use of the whole register.
- bool HandlePhysRegKill(unsigned Reg, const MachineInstr *MI,
- SmallSet<unsigned, 4> &SubKills);
bool HandlePhysRegKill(unsigned Reg, MachineInstr *MI);
+
void HandlePhysRegUse(unsigned Reg, MachineInstr *MI);
- void HandlePhysRegDef(unsigned Reg, MachineInstr *MI);
+ void HandlePhysRegDef(unsigned Reg, MachineInstr *MI,
+ SmallVector<unsigned, 4> &Defs);
+ void UpdatePhysRegDefs(MachineInstr *MI, SmallVector<unsigned, 4> &Defs);
+
+ /// FindLastRefOrPartRef - Return the last reference or partial reference of
+ /// the specified register.
+ MachineInstr *FindLastRefOrPartRef(unsigned Reg);
+
+ /// FindLastPartialDef - Return the last partial def of the specified
+ /// register. Also returns the sub-registers that're defined by the
+ /// instruction.
+ MachineInstr *FindLastPartialDef(unsigned Reg,
+ SmallSet<unsigned,4> &PartDefRegs);
/// analyzePHINodes - Gather information about the PHI nodes in here. In
/// particular, we want to map the variable information of a virtual
virtual bool runOnMachineFunction(MachineFunction &MF);
- /// KillsRegister - Return true if the specified instruction kills the
- /// specified register.
- bool KillsRegister(MachineInstr *MI, unsigned Reg) const;
-
/// RegisterDefIsDead - Return true if the specified instruction defines the
/// specified register, but that definition is dead.
bool RegisterDefIsDead(MachineInstr *MI, unsigned Reg) const;
- /// ModifiesRegister - Return true if the specified instruction modifies the
- /// specified register.
- bool ModifiesRegister(MachineInstr *MI, unsigned Reg) const;
-
//===--------------------------------------------------------------------===//
// API to update live variable information
- /// instructionChanged - When the address of an instruction changes, this
- /// method should be called so that live variables can update its internal
- /// data structures. This removes the records for OldMI, transfering them to
- /// the records for NewMI.
- void instructionChanged(MachineInstr *OldMI, MachineInstr *NewMI);
+ /// replaceKillInstruction - Update register kill info by replacing a kill
+ /// instruction with a new one.
+ void replaceKillInstruction(unsigned Reg, MachineInstr *OldMI,
+ MachineInstr *NewMI);
/// addVirtualRegisterKilled - Add information about the fact that the
/// specified register is killed after being used by the specified
/// not found.
void addVirtualRegisterKilled(unsigned IncomingReg, MachineInstr *MI,
bool AddIfNotFound = false) {
- if (MI->addRegisterKilled(IncomingReg, RegInfo, AddIfNotFound))
+ if (MI->addRegisterKilled(IncomingReg, TRI, AddIfNotFound))
getVarInfo(IncomingReg).Kills.push_back(MI);
}
- /// removeVirtualRegisterKilled - Remove the specified virtual
+ /// removeVirtualRegisterKilled - Remove the specified kill of the virtual
/// register from the live variable information. Returns true if the
/// variable was marked as killed by the specified instruction,
/// false otherwise.
- bool removeVirtualRegisterKilled(unsigned reg,
- MachineBasicBlock *MBB,
- MachineInstr *MI) {
+ bool removeVirtualRegisterKilled(unsigned reg, MachineInstr *MI) {
if (!getVarInfo(reg).removeKill(MI))
return false;
bool Removed = false;
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
MachineOperand &MO = MI->getOperand(i);
- if (MO.isRegister() && MO.isKill() && MO.getReg() == reg) {
+ if (MO.isReg() && MO.isKill() && MO.getReg() == reg) {
MO.setIsKill(false);
Removed = true;
break;
/// AddIfNotFound is true, add a implicit operand if it's not found.
void addVirtualRegisterDead(unsigned IncomingReg, MachineInstr *MI,
bool AddIfNotFound = false) {
- if (MI->addRegisterDead(IncomingReg, RegInfo, AddIfNotFound))
- getVarInfo(IncomingReg).Kills.push_back(MI);
+ if (MI->addRegisterDead(IncomingReg, TRI, AddIfNotFound))
+ getVarInfo(IncomingReg).Kills.push_back(MI);
}
- /// removeVirtualRegisterDead - Remove the specified virtual
+ /// removeVirtualRegisterDead - Remove the specified kill of the virtual
/// register from the live variable information. Returns true if the
/// variable was marked dead at the specified instruction, false
/// otherwise.
- bool removeVirtualRegisterDead(unsigned reg,
- MachineBasicBlock *MBB,
- MachineInstr *MI) {
+ bool removeVirtualRegisterDead(unsigned reg, MachineInstr *MI) {
if (!getVarInfo(reg).removeKill(MI))
return false;
bool Removed = false;
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
MachineOperand &MO = MI->getOperand(i);
- if (MO.isRegister() && MO.isDef() && MO.getReg() == reg) {
+ if (MO.isReg() && MO.isDef() && MO.getReg() == reg) {
MO.setIsDead(false);
Removed = true;
break;
assert(Removed && "Register is not defined by this instruction!");
return true;
}
-
- /// removeVirtualRegistersDead - Remove all of the dead registers for the
- /// specified instruction from the live variable information.
- void removeVirtualRegistersDead(MachineInstr *MI);
- virtual void getAnalysisUsage(AnalysisUsage &AU) const {
- AU.setPreservesAll();
- }
+ void getAnalysisUsage(AnalysisUsage &AU) const;
virtual void releaseMemory() {
VirtRegInfo.clear();
void MarkVirtRegAliveInBlock(VarInfo& VRInfo, MachineBasicBlock* DefBlock,
MachineBasicBlock *BB,
std::vector<MachineBasicBlock*> &WorkList);
+ void HandleVirtRegDef(unsigned reg, MachineInstr *MI);
void HandleVirtRegUse(unsigned reg, MachineBasicBlock *MBB,
MachineInstr *MI);
+
+ bool isLiveIn(unsigned Reg, const MachineBasicBlock &MBB) {
+ return getVarInfo(Reg).isLiveIn(MBB, Reg, *MRI);
+ }
+
+ /// isLiveOut - Determine if Reg is live out from MBB, when not considering
+ /// PHI nodes. This means that Reg is either killed by a successor block or
+ /// passed through one.
+ bool isLiveOut(unsigned Reg, const MachineBasicBlock &MBB);
+
+ /// addNewBlock - Add a new basic block BB between DomBB and SuccBB. All
+ /// variables that are live out of DomBB and live into SuccBB will be marked
+ /// as passing live through BB. This method assumes that the machine code is
+ /// still in SSA form.
+ void addNewBlock(MachineBasicBlock *BB,
+ MachineBasicBlock *DomBB,
+ MachineBasicBlock *SuccBB);
+
+ /// isPHIJoin - Return true if Reg is a phi join register.
+ bool isPHIJoin(unsigned Reg) { return PHIJoins.test(Reg); }
+
+ /// setPHIJoin - Mark Reg as a phi join register.
+ void setPHIJoin(unsigned Reg) { PHIJoins.set(Reg); }
};
} // End llvm namespace