return auto_vec from get_dominated_by

Signed-off-by: Trevor Saunders <tbsaunde@tbsaunde.org>

gcc/ChangeLog:

	* dominance.c (get_dominated_by): Return auto_vec<basic_block>.
	* dominance.h (get_dominated_by): Likewise.
	* auto-profile.c (afdo_find_equiv_class): Adjust.
	* cfgloopmanip.c (duplicate_loop_to_header_edge): Likewise.
	* loop-unroll.c (unroll_loop_runtime_iterations): Likewise.
	* tree-cfg.c (test_linear_chain): Likewise.
	(test_diamond): Likewise.

6 files changed, 17 insertions, 30 deletions

diff --git a/gcc/auto-profile.c b/gcc/auto-profile.c
index ed788dc..43d6fa0 100644
--- a/gcc/auto-profile.c
+++ b/gcc/auto-profile.c
@@ -1155,13 +1155,10 @@ afdo_find_equiv_class (bb_set *annotated_bb)
 
   FOR_ALL_BB_FN (bb, cfun)
   {
-    vec<basic_block> dom_bbs;
-
     if (bb->aux != NULL)
       continue;
     bb->aux = bb;
-    dom_bbs = get_dominated_by (CDI_DOMINATORS, bb);
-    for (basic_block bb1 : dom_bbs)
+    for (basic_block bb1 : get_dominated_by (CDI_DOMINATORS, bb))
       if (bb1->aux == NULL && dominated_by_p (CDI_POST_DOMINATORS, bb, bb1)
 	  && bb1->loop_father == bb->loop_father)
 	{
@@ -1172,8 +1169,8 @@ afdo_find_equiv_class (bb_set *annotated_bb)
 	      set_bb_annotated (bb, annotated_bb);
 	    }
 	}
-    dom_bbs = get_dominated_by (CDI_POST_DOMINATORS, bb);
-    for (basic_block bb1 : dom_bbs)
+
+    for (basic_block bb1 : get_dominated_by (CDI_POST_DOMINATORS, bb))
       if (bb1->aux == NULL && dominated_by_p (CDI_DOMINATORS, bb, bb1)
 	  && bb1->loop_father == bb->loop_father)
 	{
diff --git a/gcc/cfgloopmanip.c b/gcc/cfgloopmanip.c
index 4a9ab74..e6df280 100644
--- a/gcc/cfgloopmanip.c
+++ b/gcc/cfgloopmanip.c
@@ -1414,13 +1414,12 @@ duplicate_loop_to_header_edge (class loop *loop, edge e,
   for (i = 0; i < n; i++)
     {
       basic_block dominated, dom_bb;
-      vec<basic_block> dom_bbs;
       unsigned j;
 
       bb = bbs[i];
       bb->aux = 0;
 
-      dom_bbs = get_dominated_by (CDI_DOMINATORS, bb);
+      auto_vec<basic_block> dom_bbs = get_dominated_by (CDI_DOMINATORS, bb);
       FOR_EACH_VEC_ELT (dom_bbs, j, dominated)
 	{
 	  if (flow_bb_inside_loop_p (loop, dominated))
@@ -1429,7 +1428,6 @@ duplicate_loop_to_header_edge (class loop *loop, edge e,
 			CDI_DOMINATORS, first_active[i], first_active_latch);
 	  set_immediate_dominator (CDI_DOMINATORS, dominated, dom_bb);
 	}
-      dom_bbs.release ();
     }
   free (first_active);
 
diff --git a/gcc/dominance.c b/gcc/dominance.c
index 5fa172f..0e464cb 100644
--- a/gcc/dominance.c
+++ b/gcc/dominance.c
@@ -883,17 +883,17 @@ set_immediate_dominator (enum cdi_direction dir, basic_block bb,
 
 /* Returns the list of basic blocks immediately dominated by BB, in the
    direction DIR.  */
-vec<basic_block> 
+auto_vec<basic_block> 
 get_dominated_by (enum cdi_direction dir, basic_block bb)
 {
   unsigned int dir_index = dom_convert_dir_to_idx (dir);
   struct et_node *node = bb->dom[dir_index], *son = node->son, *ason;
-  vec<basic_block> bbs = vNULL;
+  auto_vec<basic_block> bbs;
 
   gcc_checking_assert (dom_computed[dir_index]);
 
   if (!son)
-    return vNULL;
+    return bbs;
 
   bbs.safe_push ((basic_block) son->data);
   for (ason = son->right; ason != son; ason = ason->right)
diff --git a/gcc/dominance.h b/gcc/dominance.h
index 4eeac59..515a369 100644
--- a/gcc/dominance.h
+++ b/gcc/dominance.h
@@ -46,7 +46,7 @@ extern void free_dominance_info_for_region (function *,
 extern basic_block get_immediate_dominator (enum cdi_direction, basic_block);
 extern void set_immediate_dominator (enum cdi_direction, basic_block,
 				     basic_block);
-extern vec<basic_block> get_dominated_by (enum cdi_direction, basic_block);
+extern auto_vec<basic_block> get_dominated_by (enum cdi_direction, basic_block);
 extern vec<basic_block> get_dominated_by_region (enum cdi_direction,
 							 basic_block *,
 							 unsigned);
diff --git a/gcc/loop-unroll.c b/gcc/loop-unroll.c
index 8b6fcf5..66d9348 100644
--- a/gcc/loop-unroll.c
+++ b/gcc/loop-unroll.c
@@ -884,7 +884,7 @@ unroll_loop_runtime_iterations (class loop *loop)
 {
   rtx old_niter, niter, tmp;
   rtx_insn *init_code, *branch_code;
-  unsigned i, j;
+  unsigned i;
   profile_probability p;
   basic_block preheader, *body, swtch, ezc_swtch = NULL;
   int may_exit_copy;
@@ -908,15 +908,9 @@ unroll_loop_runtime_iterations (class loop *loop)
   body = get_loop_body (loop);
   for (i = 0; i < loop->num_nodes; i++)
     {
-      vec<basic_block> ldom;
-      basic_block bb;
-
-      ldom = get_dominated_by (CDI_DOMINATORS, body[i]);
-      FOR_EACH_VEC_ELT (ldom, j, bb)
+      for (basic_block bb : get_dominated_by (CDI_DOMINATORS, body[i]))
 	if (!flow_bb_inside_loop_p (loop, bb))
 	  dom_bbs.safe_push (bb);
-
-      ldom.release ();
     }
   free (body);
 
@@ -1013,7 +1007,7 @@ unroll_loop_runtime_iterations (class loop *loop)
       gcc_assert (ok);
 
       /* Create item for switch.  */
-      j = n_peel - i - (extra_zero_check ? 0 : 1);
+      unsigned j = n_peel - i - (extra_zero_check ? 0 : 1);
       p = profile_probability::always ().apply_scale (1, i + 2);
 
       preheader = split_edge (loop_preheader_edge (loop));
diff --git a/gcc/tree-cfg.c b/gcc/tree-cfg.c
index 0225658..6bdd1a5 100644
--- a/gcc/tree-cfg.c
+++ b/gcc/tree-cfg.c
@@ -9917,22 +9917,20 @@ test_linear_chain ()
   calculate_dominance_info (CDI_DOMINATORS);
   ASSERT_EQ (bb_a, get_immediate_dominator (CDI_DOMINATORS, bb_b));
   ASSERT_EQ (bb_b, get_immediate_dominator (CDI_DOMINATORS, bb_c));
-  vec<basic_block> dom_by_b = get_dominated_by (CDI_DOMINATORS, bb_b);
+  auto_vec<basic_block> dom_by_b = get_dominated_by (CDI_DOMINATORS, bb_b);
   ASSERT_EQ (1, dom_by_b.length ());
   ASSERT_EQ (bb_c, dom_by_b[0]);
   free_dominance_info (CDI_DOMINATORS);
-  dom_by_b.release ();
 
   /* Similarly for post-dominance: each BB in our chain is post-dominated
      by the one after it.  */
   calculate_dominance_info (CDI_POST_DOMINATORS);
   ASSERT_EQ (bb_b, get_immediate_dominator (CDI_POST_DOMINATORS, bb_a));
   ASSERT_EQ (bb_c, get_immediate_dominator (CDI_POST_DOMINATORS, bb_b));
-  vec<basic_block> postdom_by_b = get_dominated_by (CDI_POST_DOMINATORS, bb_b);
+  auto_vec<basic_block> postdom_by_b = get_dominated_by (CDI_POST_DOMINATORS, bb_b);
   ASSERT_EQ (1, postdom_by_b.length ());
   ASSERT_EQ (bb_a, postdom_by_b[0]);
   free_dominance_info (CDI_POST_DOMINATORS);
-  postdom_by_b.release ();
 
   pop_cfun ();
 }
@@ -9991,10 +9989,10 @@ test_diamond ()
   ASSERT_EQ (bb_a, get_immediate_dominator (CDI_DOMINATORS, bb_b));
   ASSERT_EQ (bb_a, get_immediate_dominator (CDI_DOMINATORS, bb_c));
   ASSERT_EQ (bb_a, get_immediate_dominator (CDI_DOMINATORS, bb_d));
-  vec<basic_block> dom_by_a = get_dominated_by (CDI_DOMINATORS, bb_a);
+  auto_vec<basic_block> dom_by_a = get_dominated_by (CDI_DOMINATORS, bb_a);
   ASSERT_EQ (3, dom_by_a.length ()); /* B, C, D, in some order.  */
   dom_by_a.release ();
-  vec<basic_block> dom_by_b = get_dominated_by (CDI_DOMINATORS, bb_b);
+  auto_vec<basic_block> dom_by_b = get_dominated_by (CDI_DOMINATORS, bb_b);
   ASSERT_EQ (0, dom_by_b.length ());
   dom_by_b.release ();
   free_dominance_info (CDI_DOMINATORS);
@@ -10004,10 +10002,10 @@ test_diamond ()
   ASSERT_EQ (bb_d, get_immediate_dominator (CDI_POST_DOMINATORS, bb_a));
   ASSERT_EQ (bb_d, get_immediate_dominator (CDI_POST_DOMINATORS, bb_b));
   ASSERT_EQ (bb_d, get_immediate_dominator (CDI_POST_DOMINATORS, bb_c));
-  vec<basic_block> postdom_by_d = get_dominated_by (CDI_POST_DOMINATORS, bb_d);
+  auto_vec<basic_block> postdom_by_d = get_dominated_by (CDI_POST_DOMINATORS, bb_d);
   ASSERT_EQ (3, postdom_by_d.length ()); /* A, B, C in some order.  */
   postdom_by_d.release ();
-  vec<basic_block> postdom_by_b = get_dominated_by (CDI_POST_DOMINATORS, bb_b);
+  auto_vec<basic_block> postdom_by_b = get_dominated_by (CDI_POST_DOMINATORS, bb_b);
   ASSERT_EQ (0, postdom_by_b.length ());
   postdom_by_b.release ();
   free_dominance_info (CDI_POST_DOMINATORS);