void LiveIntervalUnion::unify(LiveInterval &VirtReg) {
if (VirtReg.empty())
return;
+ ++Tag;
// Insert each of the virtual register's live segments into the map.
LiveInterval::iterator RegPos = VirtReg.begin();
LiveInterval::iterator RegEnd = VirtReg.end();
SegmentIter SegPos = Segments.find(RegPos->start);
- for (;;) {
+ while (SegPos.valid()) {
SegPos.insert(RegPos->start, RegPos->end, &VirtReg);
if (++RegPos == RegEnd)
return;
SegPos.advanceTo(RegPos->start);
}
+
+ // We have reached the end of Segments, so it is no longer necessary to search
+ // for the insertion position.
+ // It is faster to insert the end first.
+ --RegEnd;
+ SegPos.insert(RegEnd->start, RegEnd->end, &VirtReg);
+ for (; RegPos != RegEnd; ++RegPos, ++SegPos)
+ SegPos.insert(RegPos->start, RegPos->end, &VirtReg);
}
// Remove a live virtual register's segments from this union.
void LiveIntervalUnion::extract(LiveInterval &VirtReg) {
if (VirtReg.empty())
return;
+ ++Tag;
// Remove each of the virtual register's live segments from the map.
LiveInterval::iterator RegPos = VirtReg.begin();
return FirstInterference;
CheckedFirstInterference = true;
InterferenceResult &IR = FirstInterference;
+ IR.LiveUnionI.setMap(LiveUnion->getMap());
// Quickly skip interference check for empty sets.
if (VirtReg->empty() || LiveUnion->empty()) {
// VirtReg starts first, perform double binary search.
IR.VirtRegI = VirtReg->find(LiveUnion->startIndex());
if (IR.VirtRegI != VirtReg->end())
- IR.LiveUnionI = LiveUnion->find(IR.VirtRegI->start);
+ IR.LiveUnionI.find(IR.VirtRegI->start);
} else {
// LiveUnion starts first, perform double binary search.
- IR.LiveUnionI = LiveUnion->find(VirtReg->beginIndex());
+ IR.LiveUnionI.find(VirtReg->beginIndex());
if (IR.LiveUnionI.valid())
IR.VirtRegI = VirtReg->find(IR.LiveUnionI.start());
else
//
// For comments on how to speed it up, see Query::findIntersection().
unsigned LiveIntervalUnion::Query::
-collectInterferingVRegs(unsigned MaxInterferingRegs) {
+collectInterferingVRegs(unsigned MaxInterferingRegs, float MaxWeight) {
InterferenceResult IR = firstInterference();
LiveInterval::iterator VirtRegEnd = VirtReg->end();
LiveInterval *RecentInterferingVReg = NULL;
// Cache the most recent interfering vreg to bypass isSeenInterference.
RecentInterferingVReg = IR.LiveUnionI.value();
++IR.LiveUnionI;
+
+ // Stop collecting when the max weight is exceeded.
+ if (RecentInterferingVReg->weight >= MaxWeight)
+ return InterferingVRegs.size();
+
continue;
}
// VirtRegI may have advanced far beyond LiveUnionI,