#include "llvm/CodeGen/LivePhysRegs.h"
#include "llvm/CodeGen/MachineInstrBundle.h"
#include "llvm/Support/Debug.h"
using namespace llvm;
void LivePhysRegs::removeRegsInMask(const MachineOperand &MO) {
SparseSet<unsigned>::iterator LRI = LiveRegs.begin();
while (LRI != LiveRegs.end()) {
if (MO.clobbersPhysReg(*LRI))
LRI = LiveRegs.erase(LRI);
else
++LRI;
}
}
void LivePhysRegs::stepBackward(const MachineInstr &MI) {
for (ConstMIBundleOperands O(&MI); O.isValid(); ++O) {
if (O->isReg()) {
if (!O->isDef())
continue;
unsigned Reg = O->getReg();
if (Reg == 0)
continue;
removeReg(Reg);
} else if (O->isRegMask())
removeRegsInMask(*O);
}
for (ConstMIBundleOperands O(&MI); O.isValid(); ++O) {
if (!O->isReg() || !O->readsReg() || O->isUndef())
continue;
unsigned Reg = O->getReg();
if (Reg == 0)
continue;
addReg(Reg);
}
}
void LivePhysRegs::stepForward(const MachineInstr &MI) {
SmallVector<unsigned, 4> Defs;
for (ConstMIBundleOperands O(&MI); O.isValid(); ++O) {
if (O->isReg()) {
unsigned Reg = O->getReg();
if (Reg == 0)
continue;
if (O->isDef()) {
if (!O->isDead())
Defs.push_back(Reg);
} else {
if (!O->isKill())
continue;
assert(O->isUse());
removeReg(Reg);
}
} else if (O->isRegMask())
removeRegsInMask(*O);
}
for (unsigned i = 0, e = Defs.size(); i != e; ++i)
addReg(Defs[i]);
}
void LivePhysRegs::print(raw_ostream &OS) const {
OS << "Live Registers:";
if (!TRI) {
OS << " (uninitialized)\n";
return;
}
if (empty()) {
OS << " (empty)\n";
return;
}
for (const_iterator I = begin(), E = end(); I != E; ++I)
OS << " " << PrintReg(*I, TRI);
OS << "\n";
}
void LivePhysRegs::dump() const {
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
dbgs() << " " << *this;
#endif
}