[Bug tree-optimization/112856] [14 regression] ICE when building clustal-omega

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112856

--- Comment #1 from Sam James <sjames at gcc dot gnu.org> ---
reduced C version:
```
double *SVD_A_0;
int SVD_i, SVD_j, SVD_k, SVD_n;
double SVD_f;
void SVD() {
  SVD_i = SVD_n - 1;
  for (; SVD_i; SVD_i--) {
    for (; SVD_j; SVD_j++) {
      SVD_f = SVD_k = SVD_i;
      for (; SVD_k < SVD_n; SVD_k++)
        SVD_A_0[SVD_k] += SVD_f;
    }
    SVD_j = SVD_i;
    for (; SVD_j < SVD_n; SVD_j++)
      ;
  }
}

```
fails with just gcc -O3.