+ }
+ 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;
+ }
+ }