diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/CodeGen/LiveIntervalAnalysis.cpp | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp index aa2f965..9b42012 100644 --- a/lib/CodeGen/LiveIntervalAnalysis.cpp +++ b/lib/CodeGen/LiveIntervalAnalysis.cpp @@ -1136,11 +1136,14 @@ rewriteInstructionForSpills(const LiveInterval &li, const VNInfo *VNI, rewriteImplicitOps(li, MI, NewVReg, vrm); // Reuse NewVReg for other reads. + bool HasEarlyClobber = false; for (unsigned j = 0, e = Ops.size(); j != e; ++j) { MachineOperand &mopj = MI->getOperand(Ops[j]); mopj.setReg(NewVReg); if (mopj.isImplicit()) rewriteImplicitOps(li, MI, NewVReg, vrm); + if (mopj.isEarlyClobber()) + HasEarlyClobber = true; } if (CreatedNewVReg) { @@ -1199,7 +1202,11 @@ rewriteInstructionForSpills(const LiveInterval &li, const VNInfo *VNI, } } if (HasDef) { - LiveRange LR(index.getDefIndex(), index.getStoreIndex(), + // An early clobber starts at the use slot, except for an early clobber + // tied to a use operand (yes, that is a thing). + LiveRange LR(HasEarlyClobber && !HasUse ? + index.getUseIndex() : index.getDefIndex(), + index.getStoreIndex(), nI.getNextValue(SlotIndex(), 0, VNInfoAllocator)); DEBUG(dbgs() << " +" << LR); nI.addRange(LR); |