759 static int iszero(uint32 *x) {  in iszero()  function
1187     } while (iszero(out));             /* rule out zero */  in cases_biased()
1195     } while (iszero(out));             /* rule out zero */  in cases_biased_positive()
1204     } while (iszero(out));             /* rule out zero */  in cases_biased_float()
1247     } while (iszero(out));             /* rule out zero */  in cases_uniform()
1255     } while (iszero(out));             /* rule out zero */  in cases_uniform_float()
1263     } while (iszero(out));             /* rule out zero */  in cases_uniform_positive()
1270     } while (iszero(out));             /* rule out zero */  in cases_uniform_float_positive()
1279     } while (iszero(out));             /* rule out zero */  in log_cases()
1287     } while (iszero(out));             /* rule out zero */  in log_cases_float()
1321     } while (iszero(out));             /* rule out zero */  in minmax_cases()
1333     } while (iszero(out));             /* rule out zero */  in minmax_cases_float()
1342     } while (iszero(out));             /* rule out zero */  in rred_cases()
1351     } while (iszero(out));             /* rule out zero */  in rred_cases_float()
1370     } while (iszero(out) || iszero(out+2));/* rule out zero */  in atan2_cases()
1388     } while (iszero(out) || iszero(out+2));/* rule out zero */  in atan2_cases_float()