Re: Fusing two loops

[Zdenek Dvorak]

Hi,

> The error is rectified. The bug is in the function that calls fuse_loops().
> Now I am trying to transfer all the statements, using code -
> 
> /* The following function fuses two loops.  */
> 
> void
> fuse_loops (struct loop *loop_a, struct loop *loop_b)
> {
>   debug_loop (loop_a, 10);
>   debug_loop (loop_b, 10);
>   block_stmt_iterator bsi_a = bsi_start (loop_a->header);
>   block_stmt_iterator bsi_a_last = bsi_last (loop_a->header);
>   block_stmt_iterator bsi_b = bsi_last (loop_b->header);
>   while (&bsi_a != &bsi_a_last)
>     {
>       bsi_move_before (&bsi_a, &bsi_b);
>       fprintf (stderr, " transferred one statement from loop %d to
> loop %d ", loop_a->num, loop_b->num);
>       bsi_next (&bsi_a);
>     }

try

bsi_b = bsi_last (loop_b->header);

for (bsi_a = bsi_start (loop_a->header); !bsi_end_p (bsi_a); )
  {
    if (some condition)  /* you probably want to skip labels and cond_exprs */
      bsi_move_before (&bsi_a, &bsi_b);
    else
      bsi_next (&bsi_a);
  }

Zdenek