Re: [PATCH][PR65511] Fix edge probabilities in gimple_duplicate_sese_tail

[Jan Hubicka <hubicka at ucw dot cz>]

Hi,
also this code ignores counts and probabilities:
  /* Rewire the entry and exit blocks.  The successor to the entry
     block turns into the successor of DEST_FN's ENTRY_BLOCK_PTR in
     the child function.  Similarly, the predecessor of DEST_FN's
     EXIT_BLOCK_PTR turns into the predecessor of EXIT_BLOCK_PTR.  We
     need to switch CFUN between DEST_CFUN and SAVED_CFUN so that the
     various CFG manipulation function get to the right CFG.

     FIXME, this is silly.  The CFG ought to become a parameter to
     these helpers.  */
  push_cfun (dest_cfun);
  make_edge (ENTRY_BLOCK_PTR_FOR_FN (cfun), entry_bb, EDGE_FALLTHRU);
  if (exit_bb)
    make_edge (exit_bb,  EXIT_BLOCK_PTR_FOR_FN (cfun), 0);
  pop_cfun ();

  /* Back in the original function, the SESE region has disappeared,
     create a new basic block in its place.  */
  bb = create_empty_bb (entry_pred[0]);
  if (current_loops)
    add_bb_to_loop (bb, loop);
  for (i = 0; i < num_entry_edges; i++)
    {
      e = make_edge (entry_pred[i], bb, entry_flag[i]);
      e->probability = entry_prob[i];
    }

  for (i = 0; i < num_exit_edges; i++)
    {
      e = make_edge (bb, exit_succ[i], exit_flag[i]);
      e->probability = exit_prob[i];
    }

Finally I am somewhat concerned about move_block_to_fn.
The frequencies in one function may have different base from other function,
so they may need rescaling.

Honza