https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80359
--- Comment #1 from David Binderman <dcb314 at hotmail dot com> ---
Reduced file is this:
FFT(_Complex *X, int length) {
unsigned i, j;
for (; i < length; i++) {
X[i] = 0;
for (j = 0; j < length; j++)
X[i] = X[i] / length;
}
}
Interestingly, it seems to go wrong with -O2, not just -O3.
