Division by ZERO on GIMPLE?

["Bin.Cheng" <amker.cheng@xxxxxxxxx>]

Hi,
I just found some GIMPLE like below is generated during boostrap gcc
for x86, tree-vect-loop.c


  <bb 637>:
  # group_size_1432 = PHI <1(497), group_size_1017(660)>
  # scalar_dest_1287 = PHI <scalar_dest_1228(497), scalar_dest_1012(660)>
  ratio_1497 = group_size_1432 / 0;
  goto <bb 501>;

The compilation ends fine, but what is the division by 0?

Thanks,
bin

-- 
Best Regards.