[Patch PR44576]: Don't do further analysis if we could know prefetching is not benefitial

[Fang, Changpeng]

Am Freitag 09 Juli 2010, 03:15:26 schrieb Fang, Changpeng:
>> +  /* FIXME: the time should be weighted by the probabilities of the blocks in
>> +     the loop body.  */
>> +  time = tree_num_loop_insns (loop, &eni_time_weights);
>> +  ahead = (PREFETCH_LATENCY + time - 1) / time;

>Here I sometimes get a division by zero.

That should not happen (time couldn't be zero). Would you please double check and give a testcase to show the problem
if possible?

Thanks,

Changpeng