diff options
Diffstat (limited to 'lib/CodeGen/LiveRangeEdit.cpp')
| -rw-r--r-- | lib/CodeGen/LiveRangeEdit.cpp | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/lib/CodeGen/LiveRangeEdit.cpp b/lib/CodeGen/LiveRangeEdit.cpp index 428b252f97..a470877e12 100644 --- a/lib/CodeGen/LiveRangeEdit.cpp +++ b/lib/CodeGen/LiveRangeEdit.cpp @@ -210,7 +210,8 @@ bool LiveRangeEdit::foldAsLoad(LiveInterval *LI, void LiveRangeEdit::eliminateDeadDefs(SmallVectorImpl<MachineInstr*> &Dead, LiveIntervals &LIS, VirtRegMap &VRM, - const TargetInstrInfo &TII) { + const TargetInstrInfo &TII, + ArrayRef<unsigned> RegsBeingSpilled) { SetVector<LiveInterval*, SmallVector<LiveInterval*, 8>, SmallPtrSet<LiveInterval*, 8> > ToShrink; @@ -290,6 +291,21 @@ void LiveRangeEdit::eliminateDeadDefs(SmallVectorImpl<MachineInstr*> &Dead, delegate_->LRE_WillShrinkVirtReg(LI->reg); if (!LIS.shrinkToUses(LI, &Dead)) continue; + + // Don't create new intervals for a register being spilled. + // The new intervals would have to be spilled anyway so its not worth it. + // Also they currently aren't spilled so creating them and not spilling + // them results in incorrect code. + bool BeingSpilled = false; + for (unsigned i = 0, e = RegsBeingSpilled.size(); i != e; ++i) { + if (LI->reg == RegsBeingSpilled[i]) { + BeingSpilled = true; + break; + } + } + + if (BeingSpilled) continue; + // LI may have been separated, create new intervals. LI->RenumberValues(LIS); |