- // Check for last interference.
- for (unsigned i = 0, e = Iters.size(); i != e; ++i) {
- Iter &I = Iters[i];
+ // Also check for register mask interference.
+ RegMaskSlots = LIS->getRegMaskSlotsInBlock(MBBNum);
+ RegMaskBits = LIS->getRegMaskBitsInBlock(MBBNum);
+ SlotIndex Limit = BI->First.isValid() ? BI->First : Stop;
+ for (unsigned i = 0, e = RegMaskSlots.size();
+ i != e && RegMaskSlots[i] < Limit; ++i)
+ if (MachineOperand::clobbersPhysReg(RegMaskBits[i], PhysReg)) {
+ // Register mask i clobbers PhysReg before the LIU interference.
+ BI->First = RegMaskSlots[i];
+ break;
+ }
+
+ PrevPos = Stop;
+ if (BI->First.isValid())
+ break;
+
+ // No interference in this block? Go ahead and precompute the next block.
+ if (++MFI == MF->end())
+ return;
+ MBBNum = MFI->getNumber();
+ BI = &Blocks[MBBNum];
+ if (BI->Tag == Tag)
+ return;
+ tie(Start, Stop) = Indexes->getMBBRange(MBBNum);
+ }
+
+ // Check for last interference in block.
+ for (unsigned i = 0, e = RegUnits.size(); i != e; ++i) {
+ LiveIntervalUnion::SegmentIter &I = RegUnits[i].VirtI;