#define DEBUG_TYPE "slotindexes"
#include "llvm/CodeGen/SlotIndexes.h"
+#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
-#include "llvm/Support/ManagedStatic.h"
#include "llvm/Target/TargetInstrInfo.h"
using namespace llvm;
-
-// Yep - these are thread safe. See the header for details.
-namespace {
-
-
- class EmptyIndexListEntry : public IndexListEntry {
- public:
- EmptyIndexListEntry() : IndexListEntry(EMPTY_KEY) {}
- };
-
- class TombstoneIndexListEntry : public IndexListEntry {
- public:
- TombstoneIndexListEntry() : IndexListEntry(TOMBSTONE_KEY) {}
- };
-
- // The following statics are thread safe. They're read only, and you
- // can't step from them to any other list entries.
- ManagedStatic<EmptyIndexListEntry> IndexListEntryEmptyKey;
- ManagedStatic<TombstoneIndexListEntry> IndexListEntryTombstoneKey;
-}
-
char SlotIndexes::ID = 0;
INITIALIZE_PASS(SlotIndexes, "slotindexes",
"Slot index numbering", false, false)
-IndexListEntry* IndexListEntry::getEmptyKeyEntry() {
- return &*IndexListEntryEmptyKey;
-}
-
-IndexListEntry* IndexListEntry::getTombstoneKeyEntry() {
- return &*IndexListEntryTombstoneKey;
-}
-
+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));
MachineBasicBlock *mbb = &*mbbItr;
// Insert an index for the MBB start.
- SlotIndex blockStartIndex(back(), SlotIndex::LOAD);
-
- index += SlotIndex::NUM;
+ SlotIndex blockStartIndex(back(), SlotIndex::Slot_Block);
for (MachineBasicBlock::iterator miItr = mbb->begin(), miEnd = mbb->end();
miItr != miEnd; ++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::Slot_Block)));
++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::Slot_Block);
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");
+ ++NumGlobalRenum;
- functionSize = 0;
unsigned index = 0;
for (IndexListEntry *curEntry = front(); curEntry != getTail();
curEntry = curEntry->getNext()) {
-
curEntry->setIndex(index);
-
- if (curEntry->getInstr() == 0) {
- // MBB start entry. Just step index by 1.
- index += SlotIndex::NUM;
- }
- else {
- ++functionSize;
- unsigned Slots = curEntry->getInstr()->getDesc().getNumDefs();
- if (Slots == 0)
- Slots = 1;
-
- index += (Slots + 1) * 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.
void SlotIndex::print(raw_ostream &os) const {
- os << entry().getIndex() << "LudS"[getSlot()];
+ if (isValid())
+ os << entry().getIndex() << "Berd"[getSlot()];
+ else
+ os << "invalid";
}
// Dump a SlotIndex to stderr.
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