79   struct RegisterSet : private BitVector {
80     RegisterSet() : BitVector() {}  in RegisterSet()
81     explicit RegisterSet(unsigned s, bool t = false) : BitVector(s, t) {}  in RegisterSet()
82     RegisterSet(const RegisterSet &RS) : BitVector(RS) {}  in RegisterSet()
84     using BitVector::clear;
87       int First = BitVector::find_first();  in find_first()
94       int Next = BitVector::find_next(v2x(Prev));  in find_next()
103       return static_cast<RegisterSet&>(BitVector::set(Idx));  in insert()
109       return static_cast<RegisterSet&>(BitVector::reset(Idx));  in remove()
113       return static_cast<RegisterSet&>(BitVector::operator|=(Rs));  in insert()
116       return static_cast<RegisterSet&>(BitVector::reset(Rs));  in remove()
122       return BitVector::operator[](Idx);  in operator []()
127       return BitVector::operator[](Idx);  in operator []()
133       return BitVector::test(Idx);  in has()
137       return !BitVector::any();  in empty()
141       return !Rs.BitVector::test(*this);  in includes()
144       return BitVector::anyCommon(Rs);  in intersects()