diff options
Diffstat (limited to 'lib/CodeGen/LiveInterval.cpp')
-rw-r--r-- | lib/CodeGen/LiveInterval.cpp | 11 |
1 files changed, 4 insertions, 7 deletions
diff --git a/lib/CodeGen/LiveInterval.cpp b/lib/CodeGen/LiveInterval.cpp index 01077db92f..b6d1e5f643 100644 --- a/lib/CodeGen/LiveInterval.cpp +++ b/lib/CodeGen/LiveInterval.cpp @@ -827,14 +827,11 @@ void ConnectedVNInfoEqClasses::Distribute(LiveInterval *LIV[], MachineOperand &MO = RI.getOperand(); MachineInstr *MI = MO.getParent(); ++RI; - if (MO.isUse() && MO.isUndef()) - continue; // DBG_VALUE instructions should have been eliminated earlier. - SlotIndex Idx = LIS.getInstructionIndex(MI); - Idx = Idx.getRegSlot(MO.isUse()); - const VNInfo *VNI = LI.getVNInfoAt(Idx); - // FIXME: We should be able to assert(VNI) here, but the coalescer leaves - // dangling defs around. + LiveRangeQuery LRQ(LI, LIS.getInstructionIndex(MI)); + const VNInfo *VNI = MO.readsReg() ? LRQ.valueIn() : LRQ.valueDefined(); + // In the case of an <undef> use that isn't tied to any def, VNI will be + // NULL. If the use is tied to a def, VNI will be the defined value. if (!VNI) continue; MO.setReg(LIV[getEqClass(VNI)]->reg); |