[Bug tree-optimization/61515] [4.9/5 Regression] Extremely long compile time for generated code

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61515

--- Comment #17 from Richard Biener <rguenth at gcc dot gnu.org> ---
Oops, that's not 100% the same.  But

  /* Now invalidate all equivalencies we have to invalidate.  */
  for (unsigned int i = 1; i < num_ssa_names; ++i)
    {
      tree name = ssa_name (i);
      if (!name)
        continue;

      tree val = SSA_NAME_VALUE (name);
      if (TREE_CODE (val) == SSA_NAME
          && bitmap_bit_p (to_invalidate, SSA_NAME_VERSION (val)))
        record_temporary_equivalence (name, NULL_TREE, stack);
    }
  unsigned i;
  bitmap_iterator bi;
  EXECUTE_IF_SET_IN_BITMAP (to_invalidate, 0, i, bi)
    {
      tree name = ssa_name (i);
      if (SSA_NAME_VALUE (ssa_name (i)))
        record_temporary_equivalence (name, NULL_TREE, stack);
    }

would be.