tree-ssa-loop-ivopts.c (struct ivopts_data): New field iv_obstack.

	* tree-ssa-loop-ivopts.c (struct ivopts_data): New field iv_obstack.
	(tree_ssa_iv_optimize_init): Initialize iv_obstack.
	(alloc_iv): New parameter.  Allocate struct iv using obstack_alloc.
	(set_iv, find_interesting_uses_address, add_candidate_1): New
	argument to alloc_iv.
	(find_interesting_uses_op, find_interesting_uses_cond): Don't
	duplicate struct iv.
	(free_loop_data): Don't free struct iv explicitly.
	(tree_ssa_iv_optimize_finalize): Free iv_obstack.

From-SVN: r225293

gcc/ChangeLog

+2015-07-02  Bin Cheng  <bin.cheng@arm.com>
+
+	* tree-ssa-loop-ivopts.c (struct ivopts_data): New field iv_obstack.
+	(tree_ssa_iv_optimize_init): Initialize iv_obstack.
+	(alloc_iv): New parameter.  Allocate struct iv using obstack_alloc.
+	(set_iv, find_interesting_uses_address, add_candidate_1): New
+	argument to alloc_iv.
+	(find_interesting_uses_op, find_interesting_uses_cond): Don't
+	duplicate struct iv.
+	(free_loop_data): Don't free struct iv explicitly.
+	(tree_ssa_iv_optimize_finalize): Free iv_obstack.
+
 2015-07-01  DJ Delorie  <dj@redhat.com>
 
 	* config/s390/tpf.h (LIBSTDCXX): Change to CPP1.

gcc/tree-ssa-loop-ivopts.c

@@ -348,6 +348,9 @@ struct ivopts_data
   /* The maximum invariant id.  */
   unsigned max_inv_id;
 
+  /* Obstack for iv structure.  */
+  struct obstack iv_obstack;
+
   /* Whether to consider just related and important candidates when replacing a
      use.  */
   bool consider_all_candidates;
@@ -908,6 +911,7 @@ tree_ssa_iv_optimize_init (struct ivopts_data *data)
   data->inv_expr_id = 0;
   data->name_expansion_cache = NULL;
   decl_rtl_to_reset.create (20);
+  gcc_obstack_init (&data->iv_obstack);
 }
 
 /* Returns a memory object to that EXPR points.  In case we are able to
@@ -991,10 +995,12 @@ contain_complex_addr_expr (tree expr)
    for loop LOOP.  NO_OVERFLOW implies the iv doesn't overflow.  */
 
 static struct iv *
-alloc_iv (tree base, tree step, bool no_overflow = false)
+alloc_iv (struct ivopts_data *data, tree base, tree step,
+	  bool no_overflow = false)
 {
   tree expr = base;
-  struct iv *iv = XCNEW (struct iv);
+  struct iv *iv = (struct iv*) obstack_alloc (&data->iv_obstack,
+					      sizeof (struct iv));
   gcc_assert (step != NULL_TREE);
 
   /* Lower address expression in base except ones with DECL_P as operand.
@@ -1035,7 +1041,7 @@ set_iv (struct ivopts_data *data, tree iv, tree base, tree step,
   gcc_assert (!info->iv);
 
   bitmap_set_bit (data->relevant, SSA_NAME_VERSION (iv));
-  info->iv = alloc_iv (base, step, no_overflow);
+  info->iv = alloc_iv (data, base, step, no_overflow);
   info->iv->ssa_name = iv;
 }
 
@@ -1422,7 +1428,6 @@ static struct iv_use *
 find_interesting_uses_op (struct ivopts_data *data, tree op)
 {
   struct iv *iv;
-  struct iv *civ;
   gimple stmt;
   struct iv_use *use;
 
@@ -1448,14 +1453,11 @@ find_interesting_uses_op (struct ivopts_data *data, tree op)
     }
   iv->have_use_for = true;
 
-  civ = XNEW (struct iv);
-  *civ = *iv;
-
   stmt = SSA_NAME_DEF_STMT (op);
   gcc_assert (gimple_code (stmt) == GIMPLE_PHI
 	      || is_gimple_assign (stmt));
 
-  use = record_use (data, NULL, civ, stmt, USE_NONLINEAR_EXPR);
+  use = record_use (data, NULL, iv, stmt, USE_NONLINEAR_EXPR);
   iv->use_id = use->id;
 
   return use;
@@ -1534,7 +1536,7 @@ static void
 find_interesting_uses_cond (struct ivopts_data *data, gimple stmt)
 {
   tree *var_p, *bound_p;
-  struct iv *var_iv, *civ;
+  struct iv *var_iv;
 
   if (!extract_cond_operands (data, stmt, &var_p, &bound_p, &var_iv, NULL))
     {
@@ -1543,9 +1545,7 @@ find_interesting_uses_cond (struct ivopts_data *data, gimple stmt)
       return;
     }
 
-  civ = XNEW (struct iv);
-  *civ = *var_iv;
-  record_use (data, NULL, civ, stmt, USE_COMPARE);
+  record_use (data, NULL, var_iv, stmt, USE_COMPARE);
 }
 
 /* Returns the outermost loop EXPR is obviously invariant in
@@ -2030,7 +2030,7 @@ find_interesting_uses_address (struct ivopts_data *data, gimple stmt, tree *op_p
 	}
     }
 
-  civ = alloc_iv (base, step);
+  civ = alloc_iv (data, base, step);
   record_group_use (data, op_p, civ, stmt, USE_ADDRESS);
   return;
 
@@ -2673,7 +2673,7 @@ add_candidate_1 (struct ivopts_data *data,
       if (!base && !step)
 	cand->iv = NULL;
       else
-	cand->iv = alloc_iv (base, step);
+	cand->iv = alloc_iv (data, base, step);
 
       cand->pos = pos;
       if (pos != IP_ORIGINAL && cand->iv)
@@ -7180,7 +7180,6 @@ free_loop_data (struct ivopts_data *data)
       struct version_info *info;
 
       info = ver_info (data, i);
-      free (info->iv);
       info->iv = NULL;
       info->has_nonlin_use = false;
       info->preserve_biv = false;
@@ -7199,13 +7198,11 @@ free_loop_data (struct ivopts_data *data)
 	  gcc_assert (sub->related_cands == NULL);
 	  gcc_assert (sub->n_map_members == 0 && sub->cost_map == NULL);
 
-	  free (sub->iv);
 	  pre = sub;
 	  sub = sub->next;
 	  free (pre);
 	}
 
-      free (use->iv);
       BITMAP_FREE (use->related_cands);
       for (j = 0; j < use->n_map_members; j++)
 	if (use->cost_map[j].depends_on)
@@ -7219,7 +7216,6 @@ free_loop_data (struct ivopts_data *data)
     {
       struct iv_cand *cand = iv_cand (data, i);
 
-      free (cand->iv);
       if (cand->depends_on)
 	BITMAP_FREE (cand->depends_on);
       free (cand);
@@ -7261,6 +7257,7 @@ tree_ssa_iv_optimize_finalize (struct ivopts_data *data)
   delete data->inv_expr_tab;
   data->inv_expr_tab = NULL;
   free_affine_expand_cache (&data->name_expansion_cache);
+  obstack_free (&data->iv_obstack, NULL);
 }
 
 /* Returns true if the loop body BODY includes any function calls.  */