+// Repair indexes after adding and removing instructions.
+void SlotIndexes::repairIndexesInRange(MachineBasicBlock *MBB,
+ MachineBasicBlock::iterator Begin,
+ MachineBasicBlock::iterator End) {
+ // FIXME: Is this really necessary? The only caller repairIntervalsForRange()
+ // does the same thing.
+ // Find anchor points, which are at the beginning/end of blocks or at
+ // instructions that already have indexes.
+ while (Begin != MBB->begin() && !hasIndex(Begin))
+ --Begin;
+ while (End != MBB->end() && !hasIndex(End))
+ ++End;
+
+ bool includeStart = (Begin == MBB->begin());
+ SlotIndex startIdx;
+ if (includeStart)
+ startIdx = getMBBStartIdx(MBB);
+ else
+ startIdx = getInstructionIndex(Begin);
+
+ SlotIndex endIdx;
+ if (End == MBB->end())
+ endIdx = getMBBEndIdx(MBB);
+ else
+ endIdx = getInstructionIndex(End);
+
+ // FIXME: Conceptually, this code is implementing an iterator on MBB that
+ // optionally includes an additional position prior to MBB->begin(), indicated
+ // by the includeStart flag. This is done so that we can iterate MIs in a MBB
+ // in parallel with SlotIndexes, but there should be a better way to do this.
+ IndexList::iterator ListB = startIdx.listEntry()->getIterator();
+ IndexList::iterator ListI = endIdx.listEntry()->getIterator();
+ MachineBasicBlock::iterator MBBI = End;
+ bool pastStart = false;
+ while (ListI != ListB || MBBI != Begin || (includeStart && !pastStart)) {
+ assert(ListI->getIndex() >= startIdx.getIndex() &&
+ (includeStart || !pastStart) &&
+ "Decremented past the beginning of region to repair.");
+
+ MachineInstr *SlotMI = ListI->getInstr();
+ MachineInstr *MI = (MBBI != MBB->end() && !pastStart) ? MBBI : nullptr;
+ bool MBBIAtBegin = MBBI == Begin && (!includeStart || pastStart);
+
+ if (SlotMI == MI && !MBBIAtBegin) {
+ --ListI;
+ if (MBBI != Begin)
+ --MBBI;
+ else
+ pastStart = true;
+ } else if (MI && mi2iMap.find(MI) == mi2iMap.end()) {
+ if (MBBI != Begin)
+ --MBBI;
+ else
+ pastStart = true;
+ } else {
+ --ListI;
+ if (SlotMI)
+ removeMachineInstrFromMaps(SlotMI);