INITIALIZE_PASS(SlotIndexes, "slotindexes",
"Slot index numbering", false, false)
-STATISTIC(NumRenumPasses, "Number of slot index renumber passes");
+STATISTIC(NumLocalRenum, "Number of local renumberings");
+STATISTIC(NumGlobalRenum, "Number of global renumberings");
void SlotIndexes::getAnalysisUsage(AnalysisUsage &au) const {
au.setPreservesAll();
void SlotIndexes::releaseMemory() {
mi2iMap.clear();
- mbb2IdxMap.clear();
+ MBBRanges.clear();
idx2MBBMap.clear();
clearList();
}
"Index list non-empty at initial numbering?");
assert(idx2MBBMap.empty() &&
"Index -> MBB mapping non-empty at initial numbering?");
- assert(mbb2IdxMap.empty() &&
+ assert(MBBRanges.empty() &&
"MBB -> Index mapping non-empty at initial numbering?");
assert(mi2iMap.empty() &&
"MachineInstr -> Index mapping non-empty at initial numbering?");
functionSize = 0;
unsigned index = 0;
+ MBBRanges.resize(mf->getNumBlockIDs());
+ idx2MBBMap.reserve(mf->size());
push_back(createEntry(0, index));
// Insert an index for the MBB start.
SlotIndex blockStartIndex(back(), SlotIndex::LOAD);
- index += SlotIndex::NUM;
-
for (MachineBasicBlock::iterator miItr = mbb->begin(), miEnd = mbb->end();
miItr != miEnd; ++miItr) {
MachineInstr *mi = miItr;
continue;
// Insert a store index for the instr.
- push_back(createEntry(mi, index));
+ push_back(createEntry(mi, index += SlotIndex::InstrDist));
// Save this base index in the maps.
- mi2iMap.insert(
- std::make_pair(mi, SlotIndex(back(), SlotIndex::LOAD)));
+ mi2iMap.insert(std::make_pair(mi, SlotIndex(back(), SlotIndex::LOAD)));
++functionSize;
-
- unsigned Slots = mi->getDesc().getNumDefs();
- if (Slots == 0)
- Slots = 1;
-
- index += (Slots + 1) * SlotIndex::NUM;
}
- // We insert two blank instructions between basic blocks.
- // One to represent live-out registers and one to represent live-ins.
- push_back(createEntry(0, index));
- index += SlotIndex::NUM;
-
- push_back(createEntry(0, index));
-
- SlotIndex blockEndIndex(back(), SlotIndex::LOAD);
- mbb2IdxMap.insert(
- std::make_pair(mbb, std::make_pair(blockStartIndex, blockEndIndex)));
+ // We insert one blank instructions between basic blocks.
+ push_back(createEntry(0, index += SlotIndex::InstrDist));
+ MBBRanges[mbb->getNumber()].first = blockStartIndex;
+ MBBRanges[mbb->getNumber()].second = SlotIndex(back(), SlotIndex::LOAD);
idx2MBBMap.push_back(IdxMBBPair(blockStartIndex, mbb));
}
}
void SlotIndexes::renumberIndexes() {
-
// Renumber updates the index of every element of the index list.
- // If all instrs in the function have been allocated an index (which has been
- // placed in the index list in the order of instruction iteration) then the
- // resulting numbering will match what would have been generated by the
- // pass during the initial numbering of the function if the new instructions
- // had been present.
DEBUG(dbgs() << "\n*** Renumbering SlotIndexes ***\n");
- ++NumRenumPasses;
+ ++NumGlobalRenum;
unsigned index = 0;
for (IndexListEntry *curEntry = front(); curEntry != getTail();
curEntry = curEntry->getNext()) {
curEntry->setIndex(index);
- index += 4*SlotIndex::NUM;
+ index += SlotIndex::InstrDist;
}
}
+// Renumber indexes locally after curEntry was inserted, but failed to get a new
+// index.
+void SlotIndexes::renumberIndexes(IndexListEntry *curEntry) {
+ // Number indexes with half the default spacing so we can catch up quickly.
+ const unsigned Space = SlotIndex::InstrDist/2;
+ assert((Space & 3) == 0 && "InstrDist must be a multiple of 2*NUM");
+
+ IndexListEntry *start = curEntry->getPrev();
+ unsigned index = start->getIndex();
+ IndexListEntry *tail = getTail();
+ do {
+ curEntry->setIndex(index += Space);
+ curEntry = curEntry->getNext();
+ // If the next index is bigger, we have caught up.
+ } while (curEntry != tail && curEntry->getIndex() <= index);
+
+ DEBUG(dbgs() << "\n*** Renumbered SlotIndexes " << start->getIndex() << '-'
+ << index << " ***\n");
+ ++NumLocalRenum;
+}
+
+
void SlotIndexes::dump() const {
for (const IndexListEntry *itr = front(); itr != getTail();
itr = itr->getNext()) {
}
}
- for (MBB2IdxMap::const_iterator itr = mbb2IdxMap.begin();
- itr != mbb2IdxMap.end(); ++itr) {
- dbgs() << "MBB " << itr->first->getNumber() << " (" << itr->first << ") - ["
- << itr->second.first << ", " << itr->second.second << "]\n";
- }
+ for (unsigned i = 0, e = MBBRanges.size(); i != e; ++i)
+ dbgs() << "BB#" << i << "\t[" << MBBRanges[i].first << ';'
+ << MBBRanges[i].second << ")\n";
}
// Print a SlotIndex to a raw_ostream.