/// Look for every register defined by potential LOHs candidates.
/// Map these registers with dense id in @p RegToId and vice-versa in
/// @p IdToReg. @p IdToReg is populated only in DEBUG mode.
static void collectInvolvedReg(const MachineFunction &MF, MapRegToId &RegToId,
MapIdToReg &IdToReg,
const TargetRegisterInfo *TRI) {
unsigned CurRegId = 0;
if (!PreCollectRegister) {
unsigned NbReg = TRI->getNumRegs();
for (; CurRegId < NbReg; ++CurRegId) {
RegToId[CurRegId] = CurRegId;
DEBUG(IdToReg.push_back(CurRegId));
DEBUG(assert(IdToReg[CurRegId] == CurRegId && "Reg index mismatches"));
}
return;
}
DEBUG(dbgs() << "** Collect Involved Register\n");
for (const auto &MBB : MF) {
for (const MachineInstr &MI : MBB) {
if (!canDefBePartOfLOH(&MI) &&
!isCandidateLoad(&MI) && !isCandidateStore(&MI))
continue;
// Process defs
for (MachineInstr::const_mop_iterator IO = MI.operands_begin(),
IOEnd = MI.operands_end();
IO != IOEnd; ++IO) {
if (!IO->isReg() || !IO->isDef())
continue;
unsigned CurReg = IO->getReg();
for (MCRegAliasIterator AI(CurReg, TRI, true); AI.isValid(); ++AI)
if (RegToId.find(*AI) == RegToId.end()) {
DEBUG(IdToReg.push_back(*AI);
assert(IdToReg[CurRegId] == *AI &&
"Reg index mismatches insertion index."));
RegToId[*AI] = CurRegId++;
DEBUG(dbgs() << "Register: " << PrintReg(*AI, TRI) << '\n');
}
}
}
}
void MachineVerifier::verifyLiveIntervals() {
assert(LiveInts && "Don't call verifyLiveIntervals without LiveInts");
for (LiveIntervals::const_iterator LVI = LiveInts->begin(),
LVE = LiveInts->end(); LVI != LVE; ++LVI) {
const LiveInterval &LI = *LVI->second;
// Spilling and splitting may leave unused registers around. Skip them.
if (MRI->use_empty(LI.reg))
continue;
// Physical registers have much weirdness going on, mostly from coalescing.
// We should probably fix it, but for now just ignore them.
if (TargetRegisterInfo::isPhysicalRegister(LI.reg))
continue;
assert(LVI->first == LI.reg && "Invalid reg to interval mapping");
for (LiveInterval::const_vni_iterator I = LI.vni_begin(), E = LI.vni_end();
I!=E; ++I) {
VNInfo *VNI = *I;
const VNInfo *DefVNI = LI.getVNInfoAt(VNI->def);
if (!DefVNI) {
if (!VNI->isUnused()) {
report("Valno not live at def and not marked unused", MF);
*OS << "Valno #" << VNI->id << " in " << LI << '\n';
}
continue;
}
if (VNI->isUnused())
continue;
if (DefVNI != VNI) {
report("Live range at def has different valno", MF);
*OS << "Valno #" << VNI->id << " is defined at " << VNI->def
<< " where valno #" << DefVNI->id << " is live in " << LI << '\n';
continue;
}
const MachineBasicBlock *MBB = LiveInts->getMBBFromIndex(VNI->def);
if (!MBB) {
report("Invalid definition index", MF);
*OS << "Valno #" << VNI->id << " is defined at " << VNI->def
<< " in " << LI << '\n';
continue;
}
if (VNI->isPHIDef()) {
if (VNI->def != LiveInts->getMBBStartIdx(MBB)) {
report("PHIDef value is not defined at MBB start", MF);
*OS << "Valno #" << VNI->id << " is defined at " << VNI->def
<< ", not at the beginning of BB#" << MBB->getNumber()
<< " in " << LI << '\n';
}
} else {
// Non-PHI def.
const MachineInstr *MI = LiveInts->getInstructionFromIndex(VNI->def);
if (!MI) {
report("No instruction at def index", MF);
*OS << "Valno #" << VNI->id << " is defined at " << VNI->def
<< " in " << LI << '\n';
} else if (!MI->modifiesRegister(LI.reg, TRI)) {
report("Defining instruction does not modify register", MI);
*OS << "Valno #" << VNI->id << " in " << LI << '\n';
}
bool isEarlyClobber = false;
if (MI) {
for (MachineInstr::const_mop_iterator MOI = MI->operands_begin(),
MOE = MI->operands_end(); MOI != MOE; ++MOI) {
if (MOI->isReg() && MOI->getReg() == LI.reg && MOI->isDef() &&
MOI->isEarlyClobber()) {
isEarlyClobber = true;
break;
}
}
}
// Early clobber defs begin at USE slots, but other defs must begin at
// DEF slots.
if (isEarlyClobber) {
if (!VNI->def.isUse()) {
report("Early clobber def must be at a USE slot", MF);
*OS << "Valno #" << VNI->id << " is defined at " << VNI->def
<< " in " << LI << '\n';
}
} else if (!VNI->def.isDef()) {
report("Non-PHI, non-early clobber def must be at a DEF slot", MF);
*OS << "Valno #" << VNI->id << " is defined at " << VNI->def
<< " in " << LI << '\n';
}
}
}
for (LiveInterval::const_iterator I = LI.begin(), E = LI.end(); I!=E; ++I) {
const VNInfo *VNI = I->valno;
assert(VNI && "Live range has no valno");
if (VNI->id >= LI.getNumValNums() || VNI != LI.getValNumInfo(VNI->id)) {
report("Foreign valno in live range", MF);
I->print(*OS);
*OS << " has a valno not in " << LI << '\n';
}
if (VNI->isUnused()) {
report("Live range valno is marked unused", MF);
I->print(*OS);
*OS << " in " << LI << '\n';
}
const MachineBasicBlock *MBB = LiveInts->getMBBFromIndex(I->start);
if (!MBB) {
report("Bad start of live segment, no basic block", MF);
I->print(*OS);
*OS << " in " << LI << '\n';
continue;
}
SlotIndex MBBStartIdx = LiveInts->getMBBStartIdx(MBB);
if (I->start != MBBStartIdx && I->start != VNI->def) {
report("Live segment must begin at MBB entry or valno def", MBB);
I->print(*OS);
*OS << " in " << LI << '\n' << "Basic block starts at "
<< MBBStartIdx << '\n';
}
const MachineBasicBlock *EndMBB =
LiveInts->getMBBFromIndex(I->end.getPrevSlot());
if (!EndMBB) {
report("Bad end of live segment, no basic block", MF);
I->print(*OS);
*OS << " in " << LI << '\n';
continue;
}
if (I->end != LiveInts->getMBBEndIdx(EndMBB)) {
// The live segment is ending inside EndMBB
const MachineInstr *MI =
LiveInts->getInstructionFromIndex(I->end.getPrevSlot());
if (!MI) {
report("Live segment doesn't end at a valid instruction", EndMBB);
I->print(*OS);
*OS << " in " << LI << '\n' << "Basic block starts at "
<< MBBStartIdx << '\n';
} else if (TargetRegisterInfo::isVirtualRegister(LI.reg) &&
!MI->readsVirtualRegister(LI.reg)) {
// A live range can end with either a redefinition, a kill flag on a
// use, or a dead flag on a def.
// FIXME: Should we check for each of these?
bool hasDeadDef = false;
for (MachineInstr::const_mop_iterator MOI = MI->operands_begin(),
MOE = MI->operands_end(); MOI != MOE; ++MOI) {
if (MOI->isReg() && MOI->getReg() == LI.reg && MOI->isDef() && MOI->isDead()) {
hasDeadDef = true;
break;
}
}
if (!hasDeadDef) {
report("Instruction killing live segment neither defines nor reads "
"register", MI);
I->print(*OS);
*OS << " in " << LI << '\n';
}
}
}
// Now check all the basic blocks in this live segment.
MachineFunction::const_iterator MFI = MBB;
// Is this live range the beginning of a non-PHIDef VN?
if (I->start == VNI->def && !VNI->isPHIDef()) {
// Not live-in to any blocks.
if (MBB == EndMBB)
continue;
// Skip this block.
++MFI;
}
for (;;) {
assert(LiveInts->isLiveInToMBB(LI, MFI));
// We don't know how to track physregs into a landing pad.
if (TargetRegisterInfo::isPhysicalRegister(LI.reg) &&
MFI->isLandingPad()) {
if (&*MFI == EndMBB)
break;
++MFI;
continue;
}
// Check that VNI is live-out of all predecessors.
for (MachineBasicBlock::const_pred_iterator PI = MFI->pred_begin(),
PE = MFI->pred_end(); PI != PE; ++PI) {
SlotIndex PEnd = LiveInts->getMBBEndIdx(*PI).getPrevSlot();
const VNInfo *PVNI = LI.getVNInfoAt(PEnd);
if (VNI->isPHIDef() && VNI->def == LiveInts->getMBBStartIdx(MFI))
continue;
if (!PVNI) {
report("Register not marked live out of predecessor", *PI);
*OS << "Valno #" << VNI->id << " live into BB#" << MFI->getNumber()
<< '@' << LiveInts->getMBBStartIdx(MFI) << ", not live at "
<< PEnd << " in " << LI << '\n';
continue;
}
if (PVNI != VNI) {
report("Different value live out of predecessor", *PI);
*OS << "Valno #" << PVNI->id << " live out of BB#"
<< (*PI)->getNumber() << '@' << PEnd
<< "\nValno #" << VNI->id << " live into BB#" << MFI->getNumber()
<< '@' << LiveInts->getMBBStartIdx(MFI) << " in " << LI << '\n';
}
}
if (&*MFI == EndMBB)
break;
++MFI;
}
}
// Check the LI only has one connected component.
if (TargetRegisterInfo::isVirtualRegister(LI.reg)) {
ConnectedVNInfoEqClasses ConEQ(*LiveInts);
unsigned NumComp = ConEQ.Classify(&LI);
if (NumComp > 1) {
report("Multiple connected components in live interval", MF);
*OS << NumComp << " components in " << LI << '\n';
for (unsigned comp = 0; comp != NumComp; ++comp) {
*OS << comp << ": valnos";
for (LiveInterval::const_vni_iterator I = LI.vni_begin(),
E = LI.vni_end(); I!=E; ++I)
if (comp == ConEQ.getEqClass(*I))
*OS << ' ' << (*I)->id;
*OS << '\n';
}
}
}
}
}