Esempio n. 1
0
unsigned BitLevelInfo::getBitWidth(unsigned R) const {
  unsigned Size = 0;
  for (MachineRegisterInfo::def_iterator I = MRI->def_begin(R),
       E = MRI->def_end(); I != E; ++I) {
    unsigned S = VInstrInfo::getBitWidthOrZero(I.getOperand());
    if (S == 0) { // Get the bit width from source operand.
      assert(I->isCopy() && "Can not get register bit width!");
      S = getBitWidth(I->getOperand(1).getReg());
    }

    Size = std::max(Size, S);
  }

  return Size;
}
Esempio n. 2
0
void LiveRangeCalc::createDeadDefs(LiveInterval *LI, unsigned Reg) {
    assert(MRI && Indexes && "call reset() first");

    // Visit all def operands. If the same instruction has multiple defs of Reg,
    // LI->createDeadDef() will deduplicate.
    for (MachineRegisterInfo::def_iterator
            I = MRI->def_begin(Reg), E = MRI->def_end(); I != E; ++I) {
        const MachineInstr *MI = &*I;
        // Find the corresponding slot index.
        SlotIndex Idx;
        if (MI->isPHI())
            // PHI defs begin at the basic block start index.
            Idx = Indexes->getMBBStartIdx(MI->getParent());
        else
            // Instructions are either normal 'r', or early clobber 'e'.
            Idx = Indexes->getInstructionIndex(MI)
                  .getRegSlot(I.getOperand().isEarlyClobber());

        // Create the def in LI. This may find an existing def.
        LI->createDeadDef(Idx, *Alloc);
    }
}