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);
}
debug_loop (loop_a, 10);
debug_loop (loop_b, 10);
cancel_loop_tree (loop_a);
}
After doing this I get a segmentation fault , after 3 statements of
loop_a are transferred to loop_b.
Program received signal SIGSEGV, Segmentation fault.
0x08436245 in tsi_next (i=0xbffff5b0) at ../../trunk/gcc/tree-iterator.h:74
74 i->ptr = i->ptr->next;
Thanks,
Sandeep.
On Thu, Apr 10, 2008 at 5:57 PM, Zdenek Dvorak <[EMAIL PROTECTED]> wrote:
> Hi,
>
>
> > I have written this function
> >
> > /* 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_b = bsi_last (loop_b->header);
> > bsi_move_before (&bsi_a, &bsi_b);
> > fprintf (stderr, " transferred one statement from loop %d to loop %d
> > ", loop_a->num, loop_b->num);
> > debug_loop (loop_a, 10);
> > debug_loop (loop_b, 10);
> > cancel_loop_tree (loop_a);
> > }
> >
> > It moved one statement from loop_a to loop_b. In the same way I must
> > tranfer all other statements too. I get a internal compiler error at "
> > cancel_loop_tree(loop_a); "
>
> where exactly (can you send me a backtrace)? It does not seem possible
> for cancel_loop_tree to ICE, if fuse_loops is the only function that you
> call.
>
> Zdenek
>
