perf_reg_name
perf_reg_name(r, e_machine, e_flags),
name = perf_reg_name(reg, EM_HOST, EF_HOST);
name = perf_reg_name(reg, EM_HOST, EF_HOST);
const char *perf_reg_name(int id, uint16_t e_machine, uint32_t e_flags);
perf_reg_name(r, e_machine, e_flags), val);
perf_reg_name(rid, e_machine, e_flags), val);