You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
+Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301, USA. */
#include "config.h"
#include "system.h"
of the loop. This is beneficial since it increases efficiency of
code motion optimizations. It also saves one jump on entry to the loop. */
-static void
+static unsigned int
copy_loop_headers (void)
{
struct loops *loops;
basic_block *bbs, *copied_bbs;
unsigned n_bbs;
unsigned bbs_size;
- gcov_type entry_count, body_count, total_count;
- loops = loop_optimizer_init (dump_file);
+ loops = loop_optimizer_init (LOOPS_HAVE_PREHEADERS
+ | LOOPS_HAVE_SIMPLE_LATCHES);
if (!loops)
- return;
- rewrite_into_loop_closed_ssa (NULL, TODO_update_ssa);
-
- /* We do not try to keep the information about irreducible regions
- up-to-date. */
- loops->state &= ~LOOPS_HAVE_MARKED_IRREDUCIBLE_REGIONS;
+ return 0;
#ifdef ENABLE_CHECKING
verify_loop_structure (loops);
#endif
- bbs = xmalloc (sizeof (basic_block) * n_basic_blocks);
- copied_bbs = xmalloc (sizeof (basic_block) * n_basic_blocks);
+ bbs = XNEWVEC (basic_block, n_basic_blocks);
+ copied_bbs = XNEWVEC (basic_block, n_basic_blocks);
bbs_size = n_basic_blocks;
for (i = 1; i < loops->num; i++)
/* Ensure that the header will have just the latch as a predecessor
inside the loop. */
if (!single_pred_p (exit->dest))
- exit = single_succ_edge (loop_split_edge_with (exit, NULL));
+ exit = single_pred_edge (loop_split_edge_with (exit, NULL));
entry = loop_preheader_edge (loop);
- entry_count = entry->src->count;
- body_count = exit->dest->count;
if (!tree_duplicate_sese_region (entry, exit, bbs, n_bbs, copied_bbs))
{
continue;
}
- /* Fix profiling info. Scaling is done in gcov_type arithmetic to
- avoid losing information; this is slow, but is done at most
- once per loop. We special case 0 to avoid division by 0;
- probably other special cases exist. */
- total_count = body_count + entry_count;
- if (total_count == 0LL)
- {
- scale_bbs_frequencies_int (bbs, n_bbs, 0, 1);
- scale_bbs_frequencies_int (copied_bbs, n_bbs, 0, 1);
- }
- else
- {
- scale_bbs_frequencies_gcov_type (bbs, n_bbs, body_count, total_count);
- scale_bbs_frequencies_gcov_type (copied_bbs, n_bbs, entry_count,
- total_count);
- }
-
/* Ensure that the latch and the preheader is simple (we know that they
are not now, since there was the loop exit condition. */
loop_split_edge_with (loop_preheader_edge (loop), NULL);
free (bbs);
free (copied_bbs);
- loop_optimizer_finalize (loops, NULL);
+ loop_optimizer_finalize (loops);
+ return 0;
}
static bool