diff options
Diffstat (limited to 'lib/CodeGen/TailDuplication.cpp')
| -rw-r--r-- | lib/CodeGen/TailDuplication.cpp | 33 |
1 files changed, 26 insertions, 7 deletions
diff --git a/lib/CodeGen/TailDuplication.cpp b/lib/CodeGen/TailDuplication.cpp index 9ab4058..3223e53 100644 --- a/lib/CodeGen/TailDuplication.cpp +++ b/lib/CodeGen/TailDuplication.cpp @@ -403,26 +403,45 @@ TailDuplicatePass::UpdateSuccessorsPHIs(MachineBasicBlock *FromBB, bool isDead, II->RemoveOperand(i); } } - II->RemoveOperand(Idx+1); - II->RemoveOperand(Idx); - } + } else + Idx = 0; + + // If Idx is set, the operands at Idx and Idx+1 must be removed. + // We reuse the location to avoid expensive RemoveOperand calls. + DenseMap<unsigned,AvailableValsTy>::iterator LI=SSAUpdateVals.find(Reg); if (LI != SSAUpdateVals.end()) { // This register is defined in the tail block. for (unsigned j = 0, ee = LI->second.size(); j != ee; ++j) { MachineBasicBlock *SrcBB = LI->second[j].first; unsigned SrcReg = LI->second[j].second; - II->addOperand(MachineOperand::CreateReg(SrcReg, false)); - II->addOperand(MachineOperand::CreateMBB(SrcBB)); + if (Idx != 0) { + II->getOperand(Idx).setReg(SrcReg); + II->getOperand(Idx+1).setMBB(SrcBB); + Idx = 0; + } else { + II->addOperand(MachineOperand::CreateReg(SrcReg, false)); + II->addOperand(MachineOperand::CreateMBB(SrcBB)); + } } } else { // Live in tail block, must also be live in predecessors. for (unsigned j = 0, ee = TDBBs.size(); j != ee; ++j) { MachineBasicBlock *SrcBB = TDBBs[j]; - II->addOperand(MachineOperand::CreateReg(Reg, false)); - II->addOperand(MachineOperand::CreateMBB(SrcBB)); + if (Idx != 0) { + II->getOperand(Idx).setReg(Reg); + II->getOperand(Idx+1).setMBB(SrcBB); + Idx = 0; + } else { + II->addOperand(MachineOperand::CreateReg(Reg, false)); + II->addOperand(MachineOperand::CreateMBB(SrcBB)); + } } } + if (Idx != 0) { + II->RemoveOperand(Idx+1); + II->RemoveOperand(Idx); + } } } } |