716 static int iszero(uint32 *x) {  in iszero()  function
1144     } while (iszero(out));             /* rule out zero */  in cases_biased()
1152     } while (iszero(out));             /* rule out zero */  in cases_biased_positive()
1161     } while (iszero(out));             /* rule out zero */  in cases_biased_float()
1204     } while (iszero(out));             /* rule out zero */  in cases_uniform()
1212     } while (iszero(out));             /* rule out zero */  in cases_uniform_float()
1220     } while (iszero(out));             /* rule out zero */  in cases_uniform_positive()
1227     } while (iszero(out));             /* rule out zero */  in cases_uniform_float_positive()
1236     } while (iszero(out));             /* rule out zero */  in log_cases()
1244     } while (iszero(out));             /* rule out zero */  in log_cases_float()
1278     } while (iszero(out));             /* rule out zero */  in minmax_cases()
1290     } while (iszero(out));             /* rule out zero */  in minmax_cases_float()
1299     } while (iszero(out));             /* rule out zero */  in rred_cases()
1308     } while (iszero(out));             /* rule out zero */  in rred_cases_float()
1327     } while (iszero(out) || iszero(out+2));/* rule out zero */  in atan2_cases()
1345     } while (iszero(out) || iszero(out+2));/* rule out zero */  in atan2_cases_float()