[Bug tree-optimization/101280] [12 Regression] TSVC s231 slower with -Ofast -march=znver1 since r12-1836-g0ad9d88a3d7170b3

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101280

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Seems to be this one:

real_t s231(struct args_t * func_args)
{
//    loop interchange
//    loop with data dependency

    initialise_arrays(__func__);
    gettimeofday(&func_args->t1, NULL);

    for (int nl = 0; nl < 100*(iterations/LEN_2D); nl++) {
        for (int i = 0; i < LEN_2D; ++i) {
            for (int j = 1; j < LEN_2D; j++) {
                aa[j][i] = aa[j - 1][i] + bb[j][i];
            }
        }
        dummy(a, b, c, d, e, aa, bb, cc, 0.);
    }

    gettimeofday(&func_args->t2, NULL);
    return calc_checksum(__func__);
}