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Subject: [Bug tree-optimization/106315] [13 Regression] 7.8% increased
 codesize on specfp 507.cactuBSSN_r
Date: Fri, 29 Jul 2022 14:48:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106315

--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> ---
Here is the testcase:
---
void
bar(int *indices, int max_iter, int *actual_indices,
    int *iters_per_dim, int N_dims)
{
  int iter =3D 0;
  int sum_indices =3D 0;
  int flag, k;
  while (iter < max_iter) {
    for (k =3D N_dims - 1; k > 0; k--) {
      sum_indices +=3D actual_indices[k];
    }
    if (sum_indices >=3D max_iter) {
      return;
    }
    iter++;
    for (k =3D 0; k < N_dims; k++) {
      if (indices[k] < iters_per_dim[k] - 1) {
        indices[k]++;
        break;
      }=20
    }
  }
}
---

The second loop is unrolled after the commit.=