[Bug c/59933] for loop goes wild with assert() enabled

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59933

--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Mark Warner from comment #11)
> I'm confused .. what about..
> for (k = i; k < (int)(sizeof(NSQ_del_dec_struct) / sizeof(opus_int32)); ++k)
> ... is illegal or invalid ?
> Why does it only fail if -DDEBUG is defined ?
> I mean, this code worked fine for months .. and now

The undefined behavior is if i is smaller than 292, you access out of bound
array members (well, in C already the address arithmetics is undefined behavior
when you go further than one past the last element of the array).
The sLPC_Q14 has only 112 entries, so say if i is 0, then when k is 112, you
invoke undefined behavior, because you can't read or write sLPC_Q14[112].