Exemple #1
0
/// This function adds registers Filler defines to MBB's live-in register list.
static void addLiveInRegs(Iter Filler, MachineBasicBlock &MBB) {
  for (unsigned I = 0, E = Filler->getNumOperands(); I != E; ++I) {
    const MachineOperand &MO = Filler->getOperand(I);
    unsigned R;

    if (!MO.isReg() || !MO.isDef() || !(R = MO.getReg()))
      continue;

#ifndef NDEBUG
    const MachineFunction &MF = *MBB.getParent();
    assert(MF.getSubtarget().getRegisterInfo()->getAllocatableSet(MF).test(R) &&
           "Shouldn't move an instruction with unallocatable registers across "
           "basic block boundaries.");
#endif

    if (!MBB.isLiveIn(R))
      MBB.addLiveIn(R);
  }
}