using namespace llvm;
MachineRegisterInfo::MachineRegisterInfo(const TargetRegisterInfo &TRI)
- : TRI(&TRI), IsSSA(true) {
+ : TRI(&TRI), IsSSA(true), TracksLiveness(true) {
VRegInfo.reserve(256);
RegAllocHints.reserve(256);
UsedPhysRegs.resize(TRI.getNumRegs());
/// form, so there should only be one definition.
MachineInstr *MachineRegisterInfo::getVRegDef(unsigned Reg) const {
// Since we are in SSA form, we can use the first definition.
- if (!def_empty(Reg))
- return &*def_begin(Reg);
- return 0;
+ def_iterator I = def_begin(Reg);
+ return !I.atEnd() ? &*I : 0;
}
bool MachineRegisterInfo::hasOneUse(unsigned RegNo) const {