C++ (Cpp) MachineInstr::eraseFromBundle Examples

Example #1

File: VirtRegMap.cpp Project: 2trill2spill/freebsd

void VirtRegRewriter::handleIdentityCopy(MachineInstr &MI) const {
  if (!MI.isIdentityCopy())
    return;
  DEBUG(dbgs() << "Identity copy: " << MI);
  ++NumIdCopies;

  // Copies like:
  //    %R0 = COPY %R0<undef>
  //    %AL = COPY %AL, %EAX<imp-def>
  // give us additional liveness information: The target (super-)register
  // must not be valid before this point. Replace the COPY with a KILL
  // instruction to maintain this information.
  if (MI.getOperand(0).isUndef() || MI.getNumOperands() > 2) {
    MI.setDesc(TII->get(TargetOpcode::KILL));
    DEBUG(dbgs() << "  replace by: " << MI);
    return;
  }

  if (Indexes)
    Indexes->removeSingleMachineInstrFromMaps(MI);
  MI.eraseFromBundle();
  DEBUG(dbgs() << "  deleted.\n");
}