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remove function names from comments; NFC
llvm-svn: 244509
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@ -59,7 +59,7 @@ TailDupLimit("tail-dup-limit", cl::init(~0U), cl::Hidden);
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typedef std::vector<std::pair<MachineBasicBlock*,unsigned> > AvailableValsTy;
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typedef std::vector<std::pair<MachineBasicBlock*,unsigned> > AvailableValsTy;
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namespace {
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namespace {
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/// TailDuplicatePass - Perform tail duplication.
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/// Perform tail duplication.
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class TailDuplicatePass : public MachineFunctionPass {
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class TailDuplicatePass : public MachineFunctionPass {
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const TargetInstrInfo *TII;
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const TargetInstrInfo *TII;
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const TargetRegisterInfo *TRI;
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const TargetRegisterInfo *TRI;
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@ -69,11 +69,11 @@ namespace {
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std::unique_ptr<RegScavenger> RS;
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std::unique_ptr<RegScavenger> RS;
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bool PreRegAlloc;
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bool PreRegAlloc;
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// SSAUpdateVRs - A list of virtual registers for which to update SSA form.
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// A list of virtual registers for which to update SSA form.
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SmallVector<unsigned, 16> SSAUpdateVRs;
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SmallVector<unsigned, 16> SSAUpdateVRs;
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// SSAUpdateVals - For each virtual register in SSAUpdateVals keep a list of
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// For each virtual register in SSAUpdateVals keep a list of source virtual
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// source virtual registers.
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// registers.
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DenseMap<unsigned, AvailableValsTy> SSAUpdateVals;
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DenseMap<unsigned, AvailableValsTy> SSAUpdateVals;
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public:
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public:
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@ -207,7 +207,7 @@ static void VerifyPHIs(MachineFunction &MF, bool CheckExtra) {
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}
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}
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}
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}
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/// TailDuplicateAndUpdate - Tail duplicate the block and cleanup.
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/// Tail duplicate the block and cleanup.
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bool
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bool
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TailDuplicatePass::TailDuplicateAndUpdate(MachineBasicBlock *MBB,
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TailDuplicatePass::TailDuplicateAndUpdate(MachineBasicBlock *MBB,
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bool IsSimple,
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bool IsSimple,
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@ -310,9 +310,9 @@ TailDuplicatePass::TailDuplicateAndUpdate(MachineBasicBlock *MBB,
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return true;
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return true;
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}
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}
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/// TailDuplicateBlocks - Look for small blocks that are unconditionally
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/// Look for small blocks that are unconditionally branched to and do not fall
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/// branched to and do not fall through. Tail-duplicate their instructions
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/// through. Tail-duplicate their instructions into their predecessors to
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/// into their predecessors to eliminate (dynamic) branches.
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/// eliminate (dynamic) branches.
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bool TailDuplicatePass::TailDuplicateBlocks(MachineFunction &MF) {
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bool TailDuplicatePass::TailDuplicateBlocks(MachineFunction &MF) {
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bool MadeChange = false;
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bool MadeChange = false;
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@ -375,8 +375,7 @@ static void getRegsUsedByPHIs(const MachineBasicBlock &BB,
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}
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}
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}
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}
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/// AddSSAUpdateEntry - Add a definition and source virtual registers pair for
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/// Add a definition and source virtual registers pair for SSA update.
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/// SSA update.
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void TailDuplicatePass::AddSSAUpdateEntry(unsigned OrigReg, unsigned NewReg,
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void TailDuplicatePass::AddSSAUpdateEntry(unsigned OrigReg, unsigned NewReg,
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MachineBasicBlock *BB) {
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MachineBasicBlock *BB) {
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DenseMap<unsigned, AvailableValsTy>::iterator LI= SSAUpdateVals.find(OrigReg);
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DenseMap<unsigned, AvailableValsTy>::iterator LI= SSAUpdateVals.find(OrigReg);
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@ -390,9 +389,8 @@ void TailDuplicatePass::AddSSAUpdateEntry(unsigned OrigReg, unsigned NewReg,
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}
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}
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}
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}
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/// ProcessPHI - Process PHI node in TailBB by turning it into a copy in PredBB.
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/// Process PHI node in TailBB by turning it into a copy in PredBB. Remember the
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/// Remember the source register that's contributed by PredBB and update SSA
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/// source register that's contributed by PredBB and update SSA update map.
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/// update map.
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void TailDuplicatePass::ProcessPHI(
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void TailDuplicatePass::ProcessPHI(
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MachineInstr *MI, MachineBasicBlock *TailBB, MachineBasicBlock *PredBB,
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MachineInstr *MI, MachineBasicBlock *TailBB, MachineBasicBlock *PredBB,
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DenseMap<unsigned, unsigned> &LocalVRMap,
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DenseMap<unsigned, unsigned> &LocalVRMap,
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@ -422,7 +420,7 @@ void TailDuplicatePass::ProcessPHI(
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MI->eraseFromParent();
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MI->eraseFromParent();
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}
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}
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/// DuplicateInstruction - Duplicate a TailBB instruction to PredBB and update
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/// Duplicate a TailBB instruction to PredBB and update
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/// the source operands due to earlier PHI translation.
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/// the source operands due to earlier PHI translation.
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void TailDuplicatePass::DuplicateInstruction(MachineInstr *MI,
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void TailDuplicatePass::DuplicateInstruction(MachineInstr *MI,
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MachineBasicBlock *TailBB,
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MachineBasicBlock *TailBB,
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@ -459,9 +457,9 @@ void TailDuplicatePass::DuplicateInstruction(MachineInstr *MI,
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PredBB->insert(PredBB->instr_end(), NewMI);
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PredBB->insert(PredBB->instr_end(), NewMI);
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}
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}
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/// UpdateSuccessorsPHIs - After FromBB is tail duplicated into its predecessor
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/// After FromBB is tail duplicated into its predecessor blocks, the successors
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/// blocks, the successors have gained new predecessors. Update the PHI
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/// have gained new predecessors. Update the PHI instructions in them
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/// instructions in them accordingly.
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/// accordingly.
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void
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void
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TailDuplicatePass::UpdateSuccessorsPHIs(MachineBasicBlock *FromBB, bool isDead,
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TailDuplicatePass::UpdateSuccessorsPHIs(MachineBasicBlock *FromBB, bool isDead,
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SmallVectorImpl<MachineBasicBlock *> &TDBBs,
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SmallVectorImpl<MachineBasicBlock *> &TDBBs,
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@ -545,7 +543,7 @@ TailDuplicatePass::UpdateSuccessorsPHIs(MachineBasicBlock *FromBB, bool isDead,
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}
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}
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}
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}
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/// shouldTailDuplicate - Determine if it is profitable to duplicate this block.
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/// Determine if it is profitable to duplicate this block.
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bool
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bool
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TailDuplicatePass::shouldTailDuplicate(const MachineFunction &MF,
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TailDuplicatePass::shouldTailDuplicate(const MachineFunction &MF,
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bool IsSimple,
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bool IsSimple,
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@ -621,7 +619,7 @@ TailDuplicatePass::shouldTailDuplicate(const MachineFunction &MF,
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return canCompletelyDuplicateBB(TailBB);
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return canCompletelyDuplicateBB(TailBB);
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}
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}
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/// isSimpleBB - True if this BB has only one unconditional jump.
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/// True if this BB has only one unconditional jump.
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bool
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bool
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TailDuplicatePass::isSimpleBB(MachineBasicBlock *TailBB) {
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TailDuplicatePass::isSimpleBB(MachineBasicBlock *TailBB) {
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if (TailBB->succ_size() != 1)
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if (TailBB->succ_size() != 1)
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@ -744,7 +742,7 @@ TailDuplicatePass::duplicateSimpleBB(MachineBasicBlock *TailBB,
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return Changed;
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return Changed;
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}
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}
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/// TailDuplicate - If it is profitable, duplicate TailBB's contents in each
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/// If it is profitable, duplicate TailBB's contents in each
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/// of its predecessors.
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/// of its predecessors.
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bool
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bool
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TailDuplicatePass::TailDuplicate(MachineBasicBlock *TailBB,
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TailDuplicatePass::TailDuplicate(MachineBasicBlock *TailBB,
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@ -961,8 +959,8 @@ TailDuplicatePass::TailDuplicate(MachineBasicBlock *TailBB,
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return Changed;
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return Changed;
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}
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}
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/// RemoveDeadBlock - Remove the specified dead machine basic block from the
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/// Remove the specified dead machine basic block from the function, updating
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/// function, updating the CFG.
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/// the CFG.
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void TailDuplicatePass::RemoveDeadBlock(MachineBasicBlock *MBB) {
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void TailDuplicatePass::RemoveDeadBlock(MachineBasicBlock *MBB) {
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assert(MBB->pred_empty() && "MBB must be dead!");
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assert(MBB->pred_empty() && "MBB must be dead!");
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DEBUG(dbgs() << "\nRemoving MBB: " << *MBB);
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DEBUG(dbgs() << "\nRemoving MBB: " << *MBB);
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