diff options
Diffstat (limited to 'lib/CodeGen/MachineCSE.cpp')
-rw-r--r-- | lib/CodeGen/MachineCSE.cpp | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/lib/CodeGen/MachineCSE.cpp b/lib/CodeGen/MachineCSE.cpp index f399c1eba5..833cc00027 100644 --- a/lib/CodeGen/MachineCSE.cpp +++ b/lib/CodeGen/MachineCSE.cpp @@ -126,6 +126,28 @@ bool MachineCSE::PerformTrivialCoalescing(MachineInstr *MI, ++NumCoalesces; Changed = true; } + + if (!DefMI->isCopy()) + continue; + SrcReg = DefMI->getOperand(1).getReg(); + if (!TargetRegisterInfo::isVirtualRegister(SrcReg)) + continue; + if (DefMI->getOperand(0).getSubReg() || DefMI->getOperand(1).getSubReg()) + continue; + const TargetRegisterClass *SRC = MRI->getRegClass(SrcReg); + const TargetRegisterClass *RC = MRI->getRegClass(Reg); + const TargetRegisterClass *NewRC = getCommonSubClass(RC, SRC); + if (!NewRC) + continue; + DEBUG(dbgs() << "Coalescing: " << *DefMI); + DEBUG(dbgs() << "*** to: " << *MI); + MO.setReg(SrcReg); + MRI->clearKillFlags(SrcReg); + if (NewRC != SRC) + MRI->setRegClass(SrcReg, NewRC); + DefMI->eraseFromParent(); + ++NumCoalesces; + Changed = true; } return Changed; |