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https://github.com/RPCS3/llvm-mirror.git
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[DebugInfo] Re-apply two patches to MachineSink
These were: * D58386 / f5e1b718a67 / reverted in d382a8a768b * D58238 / ee50590e168 / reverted in a8db456b53a Of which the latter has a performance regression tracked in PR43855, fixed by D70672 / D70676, which will be committed atomically with this reapplication. Contains a minor difference to account for a change in the IsCopyInstr signature.
This commit is contained in:
Jeremy Morse
Jeremy Morse
parent
902881f779
commit
4ecf048a1c
@ -106,6 +106,9 @@ namespace {
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using AllSuccsCache =
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std::map<MachineBasicBlock *, SmallVector<MachineBasicBlock *, 4>>;
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// Remember debug uses of vregs seen, so we know what to sink out of blocks.
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DenseMap<unsigned, TinyPtrVector<MachineInstr *>> SeenDbgUsers;
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public:
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static char ID; // Pass identification
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@ -133,6 +136,7 @@ namespace {
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private:
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bool ProcessBlock(MachineBasicBlock &MBB);
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void ProcessDbgInst(MachineInstr &MI);
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bool isWorthBreakingCriticalEdge(MachineInstr &MI,
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MachineBasicBlock *From,
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MachineBasicBlock *To);
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@ -154,8 +158,14 @@ namespace {
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MachineBasicBlock *To,
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bool BreakPHIEdge);
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bool SinkInstruction(MachineInstr &MI, bool &SawStore,
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AllSuccsCache &AllSuccessors);
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/// If we sink a COPY inst, some debug users of it's destination may no
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/// longer be dominated by the COPY, and will eventually be dropped.
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/// This is easily rectified by forwarding the non-dominated debug uses
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/// to the copy source.
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void SalvageUnsunkDebugUsersOfCopy(MachineInstr &,
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MachineBasicBlock *TargetBlock);
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bool AllUsesDominatedByBlock(unsigned Reg, MachineBasicBlock *MBB,
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MachineBasicBlock *DefMBB,
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bool &BreakPHIEdge, bool &LocalUse) const;
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@ -368,8 +378,11 @@ bool MachineSinking::ProcessBlock(MachineBasicBlock &MBB) {
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if (!ProcessedBegin)
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--I;
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if (MI.isDebugInstr())
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if (MI.isDebugInstr()) {
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if (MI.isDebugValue())
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ProcessDbgInst(MI);
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continue;
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}
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bool Joined = PerformTrivialForwardCoalescing(MI, &MBB);
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if (Joined) {
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@ -385,9 +398,23 @@ bool MachineSinking::ProcessBlock(MachineBasicBlock &MBB) {
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// If we just processed the first instruction in the block, we're done.
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} while (!ProcessedBegin);
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SeenDbgUsers.clear();
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return MadeChange;
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}
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void MachineSinking::ProcessDbgInst(MachineInstr &MI) {
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// When we see DBG_VALUEs for registers, record any vreg it reads, so that
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// we know what to sink if the vreg def sinks.
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assert(MI.isDebugValue() && "Expected DBG_VALUE for processing");
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MachineOperand &MO = MI.getOperand(0);
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if (!MO.isReg() || !MO.getReg().isVirtual())
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return;
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SeenDbgUsers[MO.getReg()].push_back(&MI);
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}
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bool MachineSinking::isWorthBreakingCriticalEdge(MachineInstr &MI,
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MachineBasicBlock *From,
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MachineBasicBlock *To) {
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@ -732,18 +759,12 @@ static bool SinkingPreventsImplicitNullCheck(MachineInstr &MI,
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MBP.LHS.getReg() == BaseOp->getReg();
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}
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/// Sink an instruction and its associated debug instructions. If the debug
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/// instructions to be sunk are already known, they can be provided in DbgVals.
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/// Sink an instruction and its associated debug instructions.
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static void performSink(MachineInstr &MI, MachineBasicBlock &SuccToSinkTo,
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MachineBasicBlock::iterator InsertPos,
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SmallVectorImpl<MachineInstr *> *DbgVals = nullptr) {
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// If debug values are provided use those, otherwise call collectDebugValues.
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SmallVector<MachineInstr *, 2> DbgValuesToSink;
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if (DbgVals)
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DbgValuesToSink.insert(DbgValuesToSink.begin(),
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DbgVals->begin(), DbgVals->end());
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else
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MI.collectDebugValues(DbgValuesToSink);
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SmallVectorImpl<MachineInstr *> &DbgValuesToSink) {
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const MachineRegisterInfo &MRI = MI.getMF()->getRegInfo();
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const TargetInstrInfo &TII = *MI.getMF()->getSubtarget().getInstrInfo();
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// If we cannot find a location to use (merge with), then we erase the debug
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// location to prevent debug-info driven tools from potentially reporting
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@ -759,13 +780,60 @@ static void performSink(MachineInstr &MI, MachineBasicBlock &SuccToSinkTo,
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SuccToSinkTo.splice(InsertPos, ParentBlock, MI,
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++MachineBasicBlock::iterator(MI));
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// Move previously adjacent debug value instructions to the insert position.
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// Sink a copy of debug users to the insert position. Mark the original
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// DBG_VALUE location as 'undef', indicating that any earlier variable
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// location should be terminated as we've optimised away the value at this
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// point.
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// If the sunk instruction is a copy, try to forward the copy instead of
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// leaving an 'undef' DBG_VALUE in the original location. Don't do this if
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// there's any subregister weirdness involved.
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for (SmallVectorImpl<MachineInstr *>::iterator DBI = DbgValuesToSink.begin(),
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DBE = DbgValuesToSink.end();
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DBI != DBE; ++DBI) {
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MachineInstr *DbgMI = *DBI;
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SuccToSinkTo.splice(InsertPos, ParentBlock, DbgMI,
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++MachineBasicBlock::iterator(DbgMI));
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MachineInstr *NewDbgMI = DbgMI->getMF()->CloneMachineInstr(*DBI);
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SuccToSinkTo.insert(InsertPos, NewDbgMI);
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// Copy DBG_VALUE operand and set the original to undef. We then check to
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// see whether this is something that can be copy-forwarded. If it isn't,
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// continue around the loop.
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MachineOperand DbgMO = DbgMI->getOperand(0);
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DbgMI->getOperand(0).setReg(0);
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const MachineOperand *SrcMO = nullptr, *DstMO = nullptr;
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auto CopyOperands = TII.isCopyInstr(MI);
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if (!CopyOperands)
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continue;
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SrcMO = CopyOperands->Source;
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DstMO = CopyOperands->Destination;
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// Check validity of forwarding this copy.
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bool PostRA = MRI.getNumVirtRegs() == 0;
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// Trying to forward between physical and virtual registers is too hard.
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if (DbgMO.getReg().isVirtual() != SrcMO->getReg().isVirtual())
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continue;
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// Only try virtual register copy-forwarding before regalloc, and physical
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// register copy-forwarding after regalloc.
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bool arePhysRegs = !DbgMO.getReg().isVirtual();
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if (arePhysRegs != PostRA)
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continue;
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// Pre-regalloc, only forward if all subregisters agree (or there are no
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// subregs at all). More analysis might recover some forwardable copies.
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if (!PostRA && (DbgMO.getSubReg() != SrcMO->getSubReg() ||
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DbgMO.getSubReg() != DstMO->getSubReg()))
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continue;
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// Post-regalloc, we may be sinking a DBG_VALUE of a sub or super-register
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// of this copy. Only forward the copy if the DBG_VALUE operand exactly
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// matches the copy destination.
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if (PostRA && DbgMO.getReg() != DstMO->getReg())
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continue;
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DbgMI->getOperand(0).setReg(SrcMO->getReg());
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DbgMI->getOperand(0).setSubReg(SrcMO->getSubReg());
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}
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}
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@ -883,7 +951,25 @@ bool MachineSinking::SinkInstruction(MachineInstr &MI, bool &SawStore,
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while (InsertPos != SuccToSinkTo->end() && InsertPos->isPHI())
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++InsertPos;
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performSink(MI, *SuccToSinkTo, InsertPos);
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// Collect debug users of any vreg that this inst defines.
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SmallVector<MachineInstr *, 4> DbgUsersToSink;
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for (auto &MO : MI.operands()) {
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if (!MO.isReg() || !MO.isDef() || !MO.getReg().isVirtual())
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continue;
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if (!SeenDbgUsers.count(MO.getReg()))
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continue;
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auto &Users = SeenDbgUsers[MO.getReg()];
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DbgUsersToSink.insert(DbgUsersToSink.end(), Users.begin(), Users.end());
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}
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// After sinking, some debug users may not be dominated any more. If possible,
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// copy-propagate their operands. As it's expensive, don't do this if there's
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// no debuginfo in the program.
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if (MI.getMF()->getFunction().getSubprogram() && MI.isCopy())
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SalvageUnsunkDebugUsersOfCopy(MI, SuccToSinkTo);
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performSink(MI, *SuccToSinkTo, InsertPos, DbgUsersToSink);
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// Conservatively, clear any kill flags, since it's possible that they are no
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// longer correct.
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@ -898,6 +984,41 @@ bool MachineSinking::SinkInstruction(MachineInstr &MI, bool &SawStore,
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return true;
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}
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void MachineSinking::SalvageUnsunkDebugUsersOfCopy(
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MachineInstr &MI, MachineBasicBlock *TargetBlock) {
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assert(MI.isCopy());
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assert(MI.getOperand(1).isReg());
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// Enumerate all users of vreg operands that are def'd. Skip those that will
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// be sunk. For the rest, if they are not dominated by the block we will sink
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// MI into, propagate the copy source to them.
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SmallVector<MachineInstr *, 4> DbgDefUsers;
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const MachineRegisterInfo &MRI = MI.getMF()->getRegInfo();
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for (auto &MO : MI.operands()) {
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if (!MO.isReg() || !MO.isDef() || !MO.getReg().isVirtual())
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continue;
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for (auto &User : MRI.use_instructions(MO.getReg())) {
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if (!User.isDebugValue() || DT->dominates(TargetBlock, User.getParent()))
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continue;
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// If is in same block, will either sink or be use-before-def.
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if (User.getParent() == MI.getParent())
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continue;
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assert(User.getOperand(0).isReg() &&
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"DBG_VALUE user of vreg, but non reg operand?");
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DbgDefUsers.push_back(&User);
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}
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}
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// Point the users of this copy that are no longer dominated, at the source
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// of the copy.
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for (auto *User : DbgDefUsers) {
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User->getOperand(0).setReg(MI.getOperand(1).getReg());
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User->getOperand(0).setSubReg(MI.getOperand(1).getSubReg());
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}
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}
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//===----------------------------------------------------------------------===//
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// This pass is not intended to be a replacement or a complete alternative
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// for the pre-ra machine sink pass. It is only designed to sink COPY
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@ -1207,7 +1328,7 @@ bool PostRAMachineSinking::tryToSinkCopy(MachineBasicBlock &CurBB,
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// block.
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clearKillFlags(MI, CurBB, UsedOpsInCopy, UsedRegUnits, TRI);
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MachineBasicBlock::iterator InsertPos = SuccBB->getFirstNonPHI();
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performSink(*MI, *SuccBB, InsertPos, &DbgValsToSink);
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performSink(*MI, *SuccBB, InsertPos, DbgValsToSink);
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updateLiveIn(MI, SuccBB, UsedOpsInCopy, DefedRegsInCopy);
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Changed = true;
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105
test/DebugInfo/MIR/X86/machinesink.mir
Normal file
105
test/DebugInfo/MIR/X86/machinesink.mir
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@ -0,0 +1,105 @@
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# RUN: llc -mtriple=x86_64-unknown-unknown -run-pass=machine-sink -o - %s | FileCheck %s
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# Check various things when we sink machine instructions:
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# a) DBG_VALUEs should sink with defs
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# b) Undefs should be left behind
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# c) DBG_VALUEs not immediately following the defining inst should sink too
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# d) If we generate debug-use-before-defs through sinking, and can copy
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# propagate to a different value, we should do that.
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--- |
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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@x = common local_unnamed_addr global i32 0, align 4, !dbg !0
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; Function Attrs: noreturn nounwind uwtable
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define void @Process(i32* nocapture readonly %p) local_unnamed_addr !dbg !9 {
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; Stripped
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entry:
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br label %nou
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nou:
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br label %exit
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exit:
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ret void
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata)
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!llvm.dbg.cu = !{!1}
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!llvm.module.flags = !{!6, !7}
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!llvm.ident = !{!8}
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!0 = !DIGlobalVariableExpression(var: !DIGlobalVariable(name: "x", scope: !1, file: !2, line: 1, type: !5, isLocal: false, isDefinition: true), expr: !DIExpression())
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!1 = distinct !DICompileUnit(language: DW_LANG_C99, file: !2, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !3, globals: !4)
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!2 = !DIFile(filename: "t.c", directory: "")
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!3 = !{}
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!4 = !{!0}
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!5 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!6 = !{i32 2, !"Dwarf Version", i32 4}
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!7 = !{i32 2, !"Debug Info Version", i32 3}
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!8 = !{!"clang version 4.0.0 "}
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!9 = distinct !DISubprogram(name: "Process", scope: !2, file: !2, line: 2, type: !10, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !1, retainedNodes: !15)
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!10 = !DISubroutineType(types: !11)
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!11 = !{null, !12}
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!12 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !13, size: 64)
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!13 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !14)
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!14 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
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!15 = !{!16}
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!16 = !DILocalVariable(name: "p", arg: 1, scope: !9, file: !2, line: 2, type: !12)
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!17 = !DIExpression()
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!18 = !DILocation(line: 2, column: 34, scope: !9)
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!28 = !DILexicalBlockFile(scope: !9, file: !2, discriminator: 1)
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; CHECK: [[VARNUM:![0-9]+]] = !DILocalVariable(name: "p",
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...
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---
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name: Process
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tracksRegLiveness: true
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liveins:
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- { reg: '$rdi', virtual-reg: '%2' }
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- { reg: '$rsi', virtual-reg: '%2' }
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body: |
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bb.0.entry:
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successors: %bb.1.nou(0x80000000), %bb.2.exit
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liveins: $rdi, $esi
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; This block should have the vreg copy sunk from it, the DBG_VALUE with it,
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; and a copy-prop'd DBG_VALUE left over.
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; CHECK-LABEL: bb.0.entry:
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; CHECK: [[ARG0VREG:%[0-9]+]]:gr64 = COPY $rdi
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; CHECK-NEXT: CMP32ri $esi, 0
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; CHECK-NEXT: DBG_VALUE [[ARG0VREG]], $noreg, [[VARNUM]]
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; CHECK-NEXT: JCC_1 %bb.1, 4
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; CHECK-NEXT: JMP_1
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%2:gr64 = COPY $rdi
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%5:gr64 = COPY %2
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CMP32ri $esi, 0, implicit-def $eflags
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DBG_VALUE %5, $noreg, !16, !17, debug-location !18
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JCC_1 %bb.1.nou, 4, implicit $eflags
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JMP_1 %bb.2.exit
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bb.1.nou:
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successors: %bb.2.exit(0x80000000)
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; This block should receive the sunk copy and DBG_VALUE
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; CHECK-LABEL: bb.1.nou:
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; CHECK: [[SUNKVREG:%[0-9]+]]:gr64 = COPY [[ARG0VREG]]
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; CHECK-NEXT: DBG_VALUE [[SUNKVREG]], $noreg, [[VARNUM]]
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; CHECK-NEXT: ADD64ri8
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; CHECK-NEXT: JMP_1
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%1:gr64 = ADD64ri8 %5, 4, implicit-def dead $eflags
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JMP_1 %bb.2.exit
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bb.2.exit:
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; The DBG_VALUE below should have its operand copy-propagated after
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; the copy to %5 is sunk.
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; CHECK-LABEL: bb.2.exit:
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; CHECK: DBG_VALUE [[ARG0VREG]], $noreg, [[VARNUM]]
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; CHECK-NEXT: $rax = MOV64rr [[ARG0VREG]]
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; CHECK-NEXT: RET 0
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DBG_VALUE %5, _, !16, !17, debug-location !18
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$rax = MOV64rr %2
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RET 0
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...
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@ -69,7 +69,10 @@ body: |
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; CHECK: successors: %bb.1(0x80000000)
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; CHECK: liveins: $edi
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; CHECK: DBG_VALUE $edi, $noreg, ![[BARVAR]]
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; CHECK-NEXT: DBG_VALUE $edi, $noreg, ![[ARGVAR]]
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; CHECK-NEXT: DBG_VALUE $noreg, $noreg, ![[BAZVAR]]
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; CHECK-NEXT: renamable $cl = MOV8ri 1
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; CHECK-NEXT: DBG_VALUE $noreg, $noreg, ![[FOOVAR]]
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; CHECK-NEXT: JMP_1 %bb.1
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; CHECK: bb.1.return:
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; CHECK: liveins: $cl, $edi
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105
test/DebugInfo/MIR/X86/sink-leaves-undef.mir
Normal file
105
test/DebugInfo/MIR/X86/sink-leaves-undef.mir
Normal file
@ -0,0 +1,105 @@
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# RUN: llc %s -o - -run-pass=machine-sink -mtriple=x86_64-- | FileCheck %s
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# This is a copy of test/CodeGen/X86/MachineSink-DbgValue.ll, where we
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# additionally test that when the MOV32rm defining %0 is sunk, it leaves
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# an 'undef' DBG_VALUE behind to terminate earlier location ranges.
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--- |
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.7.0"
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; Function Attrs: nounwind readonly ssp uwtable
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define i32 @foo(i32 %i, i32* nocapture %c) !dbg !4 {
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call void @llvm.dbg.value(metadata i32 %i, metadata !9, metadata !DIExpression()), !dbg !14
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%ab = load i32, i32* %c, align 1, !dbg !15
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call void @llvm.dbg.value(metadata i32* %c, metadata !10, metadata !DIExpression()), !dbg !16
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call void @llvm.dbg.value(metadata i32 %ab, metadata !12, metadata !DIExpression()), !dbg !15
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%cd = icmp eq i32 %i, 42, !dbg !17
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br i1 %cd, label %bb1, label %bb2, !dbg !17
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bb1: ; preds = %0
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%gh = add nsw i32 %ab, 2, !dbg !18
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br label %bb2, !dbg !18
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bb2: ; preds = %bb1, %0
|
||||
%.0 = phi i32 [ %gh, %bb1 ], [ 0, %0 ]
|
||||
ret i32 %.0, !dbg !19
|
||||
}
|
||||
|
||||
; Function Attrs: nounwind readnone speculatable
|
||||
declare void @llvm.dbg.value(metadata, metadata, metadata)
|
||||
|
||||
; Function Attrs: nounwind
|
||||
declare void @llvm.stackprotector(i8*, i8**)
|
||||
|
||||
!llvm.dbg.cu = !{!0}
|
||||
!llvm.module.flags = !{!3}
|
||||
|
||||
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "Apple clang version 3.0 (tags/Apple/clang-211.10.1) (based on LLVM 3.0svn)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !2)
|
||||
!1 = !DIFile(filename: "a.c", directory: "/private/tmp")
|
||||
!2 = !{}
|
||||
!3 = !{i32 1, !"Debug Info Version", i32 3}
|
||||
!4 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 2, type: !5, virtualIndex: 6, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !8)
|
||||
!5 = !DISubroutineType(types: !6)
|
||||
!6 = !{!7}
|
||||
!7 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
|
||||
!8 = !{!9, !10, !12}
|
||||
!9 = !DILocalVariable(name: "i", arg: 1, scope: !4, file: !1, line: 2, type: !7)
|
||||
!10 = !DILocalVariable(name: "c", arg: 2, scope: !4, file: !1, line: 2, type: !11)
|
||||
!11 = !DIDerivedType(tag: DW_TAG_pointer_type, scope: !0, baseType: !7, size: 64, align: 64)
|
||||
!12 = !DILocalVariable(name: "a", scope: !13, file: !1, line: 3, type: !7)
|
||||
!13 = distinct !DILexicalBlock(scope: !4, file: !1, line: 2, column: 25)
|
||||
!14 = !DILocation(line: 2, column: 13, scope: !4)
|
||||
!15 = !DILocation(line: 3, column: 14, scope: !13)
|
||||
!16 = !DILocation(line: 2, column: 22, scope: !4)
|
||||
!17 = !DILocation(line: 4, column: 3, scope: !13)
|
||||
!18 = !DILocation(line: 5, column: 5, scope: !13)
|
||||
!19 = !DILocation(line: 7, column: 1, scope: !13)
|
||||
; CHECK: ![[VARNUM:[0-9]+]] = !DILocalVariable(name: "a",
|
||||
...
|
||||
---
|
||||
name: foo
|
||||
alignment: 4
|
||||
tracksRegLiveness: true
|
||||
registers:
|
||||
- { id: 0, class: gr32 }
|
||||
- { id: 1, class: gr32 }
|
||||
- { id: 2, class: gr32 }
|
||||
- { id: 3, class: gr32 }
|
||||
- { id: 4, class: gr64 }
|
||||
- { id: 5, class: gr32 }
|
||||
- { id: 6, class: gr32 }
|
||||
liveins:
|
||||
- { reg: '$edi', virtual-reg: '%3' }
|
||||
- { reg: '$rsi', virtual-reg: '%4' }
|
||||
body: |
|
||||
bb.0 (%ir-block.0):
|
||||
successors: %bb.1, %bb.2
|
||||
liveins: $edi, $rsi
|
||||
; CHECK-LABEL: bb.0 (%ir-block.0):
|
||||
; CHECK: DBG_VALUE $noreg, $noreg, ![[VARNUM]]
|
||||
|
||||
DBG_VALUE $edi, $noreg, !9, !DIExpression(), debug-location !14
|
||||
DBG_VALUE $rsi, $noreg, !10, !DIExpression(), debug-location !16
|
||||
%4:gr64 = COPY $rsi
|
||||
DBG_VALUE %4, $noreg, !10, !DIExpression(), debug-location !16
|
||||
%3:gr32 = COPY $edi
|
||||
DBG_VALUE %3, $noreg, !9, !DIExpression(), debug-location !14
|
||||
%0:gr32 = MOV32rm %4, 1, $noreg, 0, $noreg, debug-location !15 :: (load 4 from %ir.c, align 1)
|
||||
DBG_VALUE %0, $noreg, !12, !DIExpression(), debug-location !15
|
||||
%5:gr32 = MOV32r0 implicit-def dead $eflags
|
||||
%6:gr32 = SUB32ri8 %3, 42, implicit-def $eflags, debug-location !17
|
||||
JCC_1 %bb.2, 5, implicit $eflags, debug-location !17
|
||||
JMP_1 %bb.1, debug-location !17
|
||||
|
||||
bb.1.bb1:
|
||||
; CHECK-LABEL: bb.1.bb1:
|
||||
; CHECK: %[[VREG:[0-9]+]]:gr32 = MOV32rm
|
||||
; CHECK-NEXT: DBG_VALUE %[[VREG]], $noreg, ![[VARNUM]]
|
||||
; CHECK-NEXT: ADD32ri8
|
||||
%1:gr32 = nsw ADD32ri8 %0, 2, implicit-def dead $eflags, debug-location !18
|
||||
|
||||
bb.2.bb2:
|
||||
%2:gr32 = PHI %5, %bb.0, %1, %bb.1
|
||||
$eax = COPY %2, debug-location !19
|
||||
RET 0, $eax, debug-location !19
|
||||
|
||||
...
|
||||
Loading…
Reference in New Issue
Block a user