use auto_sbitmap in various places

gcc/ChangeLog:

2016-07-26  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* bt-load.c (compute_out): Use auto_sbitmap class.
	(link_btr_uses): Likewise.
	* cfganal.c (mark_dfs_back_edges): Likewise.
	(post_order_compute): Likewise.
	(inverted_post_order_compute): Likewise.
	(pre_and_rev_post_order_compute_fn): Likewise.
	(single_pred_before_succ_order): Likewise.
	* cfgexpand.c (pass_expand::execute): Likewise.
	* cfgloop.c (verify_loop_structure): Likewise.
	* cfgloopmanip.c (fix_bb_placements): Likewise.
	(remove_path): Likewise.
	(update_dominators_in_loop): Likewise.
	* cfgrtl.c (break_superblocks): Likewise.
	* ddg.c (check_sccs): Likewise.
	(create_ddg_all_sccs): Likewise.
	* df-core.c (df_worklist_dataflow): Likewise.
	* dse.c (dse_step3): Likewise.
	* except.c (eh_region_outermost): Likewise.
	* function.c (thread_prologue_and_epilogue_insns): Likewise.
	* gcse.c (prune_expressions): Likewise.
	(prune_insertions_deletions): Likewise.
	* gimple-ssa-backprop.c (backprop::~backprop): Likewise.
	* graph.c (draw_cfg_nodes_no_loops): Likewise.
	* ira-lives.c (remove_some_program_points_and_update_live_ranges): Likewise.
	* lcm.c (compute_earliest): Likewise.
	(compute_farthest): Likewise.
	* loop-unroll.c (unroll_loop_constant_iterations): Likewise.
	(unroll_loop_runtime_iterations): Likewise.
	(unroll_loop_stupid): Likewise.
	* lower-subreg.c (decompose_multiword_subregs): Likewise.
	* lra-lives.c: Likewise.
	* lra.c (lra): Likewise.
	* modulo-sched.c (schedule_reg_moves): Likewise.
	(optimize_sc): Likewise.
	(get_sched_window): Likewise.
	(sms_schedule_by_order): Likewise.
	(check_nodes_order): Likewise.
	(order_nodes_of_sccs): Likewise.
	(order_nodes_in_scc): Likewise.
	* recog.c (split_all_insns): Likewise.
	* regcprop.c (pass_cprop_hardreg::execute): Likewise.
	* reload1.c (reload): Likewise.
	* sched-rgn.c (haifa_find_rgns): Likewise.
	(split_edges): Likewise.
	(compute_trg_info): Likewise.
	* sel-sched.c (init_seqno): Likewise.
	* store-motion.c (remove_reachable_equiv_notes): Likewise.
	* tree-into-ssa.c (update_ssa): Likewise.
	* tree-ssa-live.c (live_worklist): Likewise.
	* tree-ssa-loop-im.c (fill_always_executed_in): Likewise.
	* tree-ssa-loop-ivcanon.c (try_unroll_loop_completely):
	* Likewise.
	(try_peel_loop): Likewise.
	* tree-ssa-loop-manip.c (tree_transform_and_unroll_loop):
	* Likewise.
	* tree-ssa-pre.c (compute_antic): Likewise.
	* tree-ssa-reassoc.c (undistribute_ops_list): Likewise.
	* tree-stdarg.c (reachable_at_most_once): Likewise.
	* tree-vect-slp.c (vect_attempt_slp_rearrange_stmts): Likewise.
	* var-tracking.c (vt_find_locations): Likewise.

From-SVN: r238748

1 files changed, 2 insertions, 8 deletions

diff --git a/gcc/tree-ssa-loop-ivcanon.c b/gcc/tree-ssa-loop-ivcanon.c
index 76ecba4..beb65b0 100644
--- a/gcc/tree-ssa-loop-ivcanon.c
+++ b/gcc/tree-ssa-loop-ivcanon.c
@@ -743,7 +743,6 @@ try_unroll_loop_completely (struct loop *loop,
 
   if (n_unroll)
     {
-      sbitmap wont_exit;
       bool large;
       if (ul == UL_SINGLE_ITER)
 	return false;
@@ -860,7 +859,7 @@ try_unroll_loop_completely (struct loop *loop,
                        "loop turned into non-loop; it never loops.\n");
 
       initialize_original_copy_tables ();
-      wont_exit = sbitmap_alloc (n_unroll + 1);
+      auto_sbitmap wont_exit (n_unroll + 1);
       if (exit && niter
 	  && TREE_CODE (niter) == INTEGER_CST
 	  && wi::leu_p (n_unroll, wi::to_widest (niter)))
@@ -883,13 +882,11 @@ try_unroll_loop_completely (struct loop *loop,
 						 | DLTHE_FLAG_COMPLETTE_PEEL))
 	{
           free_original_copy_tables ();
-	  free (wont_exit);
 	  if (dump_file && (dump_flags & TDF_DETAILS))
 	    fprintf (dump_file, "Failed to duplicate the loop\n");
 	  return false;
 	}
 
-      free (wont_exit);
       free_original_copy_tables ();
     }
 
@@ -967,7 +964,6 @@ try_peel_loop (struct loop *loop,
   HOST_WIDE_INT npeel;
   struct loop_size size;
   int peeled_size;
-  sbitmap wont_exit;
 
   if (!flag_peel_loops || PARAM_VALUE (PARAM_MAX_PEEL_TIMES) <= 0
       || !peeled_loops)
@@ -1042,7 +1038,7 @@ try_peel_loop (struct loop *loop,
 
   /* Duplicate possibly eliminating the exits.  */
   initialize_original_copy_tables ();
-  wont_exit = sbitmap_alloc (npeel + 1);
+  auto_sbitmap wont_exit (npeel + 1);
   if (exit && niter
       && TREE_CODE (niter) == INTEGER_CST
       && wi::leu_p (npeel, wi::to_widest (niter)))
@@ -1061,10 +1057,8 @@ try_peel_loop (struct loop *loop,
 					     DLTHE_FLAG_UPDATE_FREQ))
     {
       free_original_copy_tables ();
-      free (wont_exit);
       return false;
     }
-  free (wont_exit);
   free_original_copy_tables ();
   if (dump_file && (dump_flags & TDF_DETAILS))
     {