"enable-subreg-liveness", cl::Hidden, cl::init(true),
cl::desc("Enable subregister liveness tracking."));
+namespace llvm {
+cl::opt<bool> UseSegmentSetForPhysRegs(
+ "use-segment-set-for-physregs", cl::Hidden, cl::init(true),
+ cl::desc(
+ "Use segment set for the computation of the live ranges of physregs."));
+}
+
void LiveIntervals::getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesCFG();
AU.addRequired<AliasAnalysis>();
assert(LRCalc && "LRCalc not initialized.");
assert(LI.empty() && "Should only compute empty intervals.");
LRCalc->reset(MF, getSlotIndexes(), DomTree, &getVNInfoAllocator());
- LRCalc->calculate(LI);
+ LRCalc->calculate(LI, MRI->shouldTrackSubRegLiveness(LI.reg));
computeDeadValues(LI, nullptr);
}
RMB.first = RegMaskSlots.size();
for (MachineBasicBlock::iterator MI = MBB->begin(), ME = MBB->end();
MI != ME; ++MI)
- for (MIOperands MO(MI); MO.isValid(); ++MO) {
- if (!MO->isRegMask())
+ for (const MachineOperand &MO : MI->operands()) {
+ if (!MO.isRegMask())
continue;
RegMaskSlots.push_back(Indexes->getInstructionIndex(MI).getRegSlot());
- RegMaskBits.push_back(MO->getRegMask());
+ RegMaskBits.push_back(MO.getRegMask());
}
// Compute the number of register mask instructions in this block.
RMB.second = RegMaskSlots.size() - RMB.first;
LRCalc->extendToUses(LR, Reg);
}
}
+
+ // Flush the segment set to the segment vector.
+ if (UseSegmentSetForPhysRegs)
+ LR.flushSegmentSet();
}
const MachineBasicBlock *MBB = MFI;
// We only care about ABI blocks: Entry + landing pads.
- if ((MFI != MF->begin() && !MBB->isLandingPad()) || MBB->livein_empty())
+ if ((MFI != MF->begin() && !MBB->isEHPad()) || MBB->livein_empty())
continue;
// Create phi-defs at Begin for all live-in registers.
SlotIndex Begin = Indexes->getMBBStartIdx(MBB);
DEBUG(dbgs() << Begin << "\tBB#" << MBB->getNumber());
- for (MachineBasicBlock::livein_iterator LII = MBB->livein_begin(),
- LIE = MBB->livein_end(); LII != LIE; ++LII) {
- for (MCRegUnitIterator Units(*LII, TRI); Units.isValid(); ++Units) {
+ for (unsigned LI : MBB->liveins()) {
+ for (MCRegUnitIterator Units(LI, TRI); Units.isValid(); ++Units) {
unsigned Unit = *Units;
LiveRange *LR = RegUnitRanges[Unit];
if (!LR) {
- LR = RegUnitRanges[Unit] = new LiveRange();
+ // Use segment set to speed-up initial computation of the live range.
+ LR = RegUnitRanges[Unit] = new LiveRange(UseSegmentSetForPhysRegs);
NewRanges.push_back(Unit);
}
VNInfo *VNI = LR->createDeadDef(Begin, getVNInfoAllocator());
}
}
-/// shrinkToUses - After removing some uses of a register, shrink its live
-/// range to just the remaining uses. This method does not compute reaching
-/// defs for new uses, and it doesn't remove dead defs.
bool LiveIntervals::shrinkToUses(LiveInterval *li,
SmallVectorImpl<MachineInstr*> *dead) {
DEBUG(dbgs() << "Shrink: " << *li << '\n');
&& "Can only shrink virtual registers");
// Shrink subregister live ranges.
+ bool NeedsCleanup = false;
for (LiveInterval::SubRange &S : li->subranges()) {
shrinkToUses(S, li->reg);
+ if (S.empty())
+ NeedsCleanup = true;
}
+ if (NeedsCleanup)
+ li->removeEmptySubRanges();
// Find all the values used, including PHI kills.
ShrinkToUsesWorkList WorkList;
for (auto VNI : LI.valnos) {
if (VNI->isUnused())
continue;
- LiveRange::iterator I = LI.FindSegmentContaining(VNI->def);
+ SlotIndex Def = VNI->def;
+ LiveRange::iterator I = LI.FindSegmentContaining(Def);
assert(I != LI.end() && "Missing segment for VNI");
- if (I->end != VNI->def.getDeadSlot())
+
+ // Is the register live before? Otherwise we may have to add a read-undef
+ // flag for subregister defs.
+ if (MRI->shouldTrackSubRegLiveness(LI.reg)) {
+ if ((I == LI.begin() || std::prev(I)->end < Def) && !VNI->isPHIDef()) {
+ MachineInstr *MI = getInstructionFromIndex(Def);
+ MI->addRegisterDefReadUndef(LI.reg);
+ }
+ }
+
+ if (I->end != Def.getDeadSlot())
continue;
if (VNI->isPHIDef()) {
// This is a dead PHI. Remove it.
VNI->markUnused();
LI.removeSegment(I);
- DEBUG(dbgs() << "Dead PHI at " << VNI->def << " may separate interval\n");
+ DEBUG(dbgs() << "Dead PHI at " << Def << " may separate interval\n");
PHIRemoved = true;
} else {
// This is a dead def. Make sure the instruction knows.
- MachineInstr *MI = getInstructionFromIndex(VNI->def);
+ MachineInstr *MI = getInstructionFromIndex(Def);
assert(MI && "No instruction defining live value");
MI->addRegisterDead(LI.reg, TRI);
if (dead && MI->allDefsAreDead()) {
- DEBUG(dbgs() << "All defs dead: " << VNI->def << '\t' << *MI);
+ DEBUG(dbgs() << "All defs dead: " << Def << '\t' << *MI);
dead->push_back(MI);
}
}
RU.push_back(std::make_pair(&RURange, RURange.find(LI.begin()->end)));
}
- if (MRI->tracksSubRegLiveness()) {
+ if (MRI->subRegLivenessEnabled()) {
SRs.clear();
for (const LiveInterval::SubRange &SR : LI.subranges()) {
SRs.push_back(std::make_pair(&SR, SR.find(LI.begin()->end)));
goto CancelKill;
}
- if (MRI->tracksSubRegLiveness()) {
+ if (MRI->subRegLivenessEnabled()) {
// When reading a partial undefined value we must not add a kill flag.
// The regalloc might have used the undef lane for something else.
// Example:
void updateAllRanges(MachineInstr *MI) {
DEBUG(dbgs() << "handleMove " << OldIdx << " -> " << NewIdx << ": " << *MI);
bool hasRegMask = false;
- for (MIOperands MO(MI); MO.isValid(); ++MO) {
- if (MO->isRegMask())
+ for (MachineOperand &MO : MI->operands()) {
+ if (MO.isRegMask())
hasRegMask = true;
- if (!MO->isReg())
+ if (!MO.isReg())
continue;
// Aggressively clear all kill flags.
// They are reinserted by VirtRegRewriter.
- if (MO->isUse())
- MO->setIsKill(false);
+ if (MO.isUse())
+ MO.setIsKill(false);
- unsigned Reg = MO->getReg();
+ unsigned Reg = MO.getReg();
if (!Reg)
continue;
if (TargetRegisterInfo::isVirtualRegister(Reg)) {
LiveInterval &LI = LIS.getInterval(Reg);
if (LI.hasSubRanges()) {
- unsigned SubReg = MO->getSubReg();
+ unsigned SubReg = MO.getSubReg();
unsigned LaneMask = TRI.getSubRegIndexLaneMask(SubReg);
for (LiveInterval::SubRange &S : LI.subranges()) {
if ((S.LaneMask & LaneMask) == 0)
LR->removeValNo(VNI);
}
}
+
+void LiveIntervals::removeVRegDefAt(LiveInterval &LI, SlotIndex Pos) {
+ VNInfo *VNI = LI.getVNInfoAt(Pos);
+ if (VNI == nullptr)
+ return;
+ LI.removeValNo(VNI);
+
+ // Also remove the value in subranges.
+ for (LiveInterval::SubRange &S : LI.subranges()) {
+ if (VNInfo *SVNI = S.getVNInfoAt(Pos))
+ S.removeValNo(SVNI);
+ }
+ LI.removeEmptySubRanges();
+}
projects / oota-llvm.git / blobdiff