// Find the next real instruction from the current position in current basic
// block.
static Iter getNextMachineInstrInBB(Iter Position) {
Iter I = Position, E = Position->getParent()->end();
I = std::find_if_not(I, E,
[](const Iter &Insn) { return Insn->isTransient(); });
return I;
}
/// This function inserts clones of Filler into predecessor blocks.
static void insertDelayFiller(Iter Filler, const BB2BrMap &BrMap) {
MachineFunction *MF = Filler->getParent()->getParent();
for (BB2BrMap::const_iterator I = BrMap.begin(); I != BrMap.end(); ++I) {
if (I->second) {
MIBundleBuilder(I->second).append(MF->CloneMachineInstr(&*Filler));
++UsefulSlots;
} else {
I->first->insert(I->first->end(), MF->CloneMachineInstr(&*Filler));
}
}
}
// Find the next real instruction from the current position, looking through
// basic block boundaries.
static Iter getNextMachineInstr(Iter Position) {
if (std::next(Position) == Position->getParent()->end()) {
const MachineBasicBlock * MBB = (&*Position)->getParent();
for (auto *Succ : MBB->successors()) {
if (MBB->isLayoutSuccessor(Succ)) {
Iter I = Succ->begin();
Iter Next = getNextMachineInstrInBB(I);
if (Next == Succ->end()) {
return getNextMachineInstr(I);
} else {
return I;
}
}
}
llvm_unreachable("Should have identified the end of the function earlier!");
}
return getNextMachineInstrInBB(Position);
}
