/// Add pristine registers to the given \p LiveRegs. This function removes
/// actually saved callee save registers when \p InPrologueEpilogue is false.
static void addPristines(LivePhysRegs &LiveRegs, const MachineFunction &MF,
const MachineFrameInfo &MFI,
const TargetRegisterInfo &TRI) {
for (const MCPhysReg *CSR = TRI.getCalleeSavedRegs(&MF); CSR && *CSR; ++CSR)
LiveRegs.addReg(*CSR);
for (const CalleeSavedInfo &Info : MFI.getCalleeSavedInfo())
LiveRegs.removeReg(Info.getReg());
}
static void findTemporariesForLR(const BitVector &GPRsNoLRSP,
const BitVector &PopFriendly,
const LivePhysRegs &UsedRegs, unsigned &PopReg,
unsigned &TmpReg) {
PopReg = TmpReg = 0;
for (auto Reg : GPRsNoLRSP.set_bits()) {
if (!UsedRegs.contains(Reg)) {
// Remember the first pop-friendly register and exit.
if (PopFriendly.test(Reg)) {
PopReg = Reg;
TmpReg = 0;
break;
}
// Otherwise, remember that the register will be available to
// save a pop-friendly register.
TmpReg = Reg;
}
}
}
/// Add live-in registers of basic block \p MBB to \p LiveRegs.
static void addLiveIns(LivePhysRegs &LiveRegs, const MachineBasicBlock &MBB) {
for (const auto &LI : MBB.liveins())
LiveRegs.addReg(LI.PhysReg);
}
