Empty the redirect_edge_var_map after each pass

	Alan Lawrence  <alan.lawrence@arm.com>
	Richard Biener  <richard.guenther@gmail.com>

	* cfgexpand.c (pass_expand::execute): Replace call to
	redirect_edge_var_map_destroy with redirect_edge_var_map_empty.
	* tree-ssa.c (delete_tree_ssa): Likewise.
	* function.c (set_cfun): Call redirect_edge_var_map_empty.
	* passes.c (execute_one_ipa_transform_pass, execute_one_pass): Likewise.
	* tree-ssa.h (redirect_edge_var_map_destroy): Remove.
	(redirect_edge_var_map_empty): New.
	* tree-ssa.c (redirect_edge_var_map_destroy): Remove.
	(redirect_edge_var_map_empty): New.

Co-Authored-By: Richard Biener <richard.guenther@gmail.com>

From-SVN: r231232

gcc/ChangeLog

+2015-12-03  Alan Lawrence  <alan.lawrence@arm.com>
+	    Richard Biener  <richard.guenther@gmail.com>
+
+	* cfgexpand.c (pass_expand::execute): Replace call to
+	redirect_edge_var_map_destroy with redirect_edge_var_map_empty.
+	* tree-ssa.c (delete_tree_ssa): Likewise.
+	* function.c (set_cfun): Call redirect_edge_var_map_empty.
+	* passes.c (execute_one_ipa_transform_pass, execute_one_pass): Likewise.
+	* tree-ssa.h (redirect_edge_var_map_destroy): Remove.
+	(redirect_edge_var_map_empty): New.
+	* tree-ssa.c (redirect_edge_var_map_destroy): Remove.
+	(redirect_edge_var_map_empty): New.
+
 2015-12-03  Jeff Law  <law@redhat.com>
 
 	PR tree-optimization/68599

gcc/cfgexpand.c

@@ -6294,7 +6294,7 @@ pass_expand::execute (function *fun)
   expand_phi_nodes (&SA);
 
   /* Release any stale SSA redirection data.  */
-  redirect_edge_var_map_destroy ();
+  redirect_edge_var_map_empty ();
 
   /* Register rtl specific functions for cfg.  */
   rtl_register_cfg_hooks ();

gcc/function.c

@@ -75,6 +75,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "tree-chkp.h"
 #include "rtl-chkp.h"
 #include "tree-dfa.h"
+#include "tree-ssa.h"
 
 /* So we can assign to cfun in this file.  */
 #undef cfun
@@ -4798,6 +4799,7 @@ set_cfun (struct function *new_cfun)
     {
       cfun = new_cfun;
       invoke_set_current_function_hook (new_cfun ? new_cfun->decl : NULL_TREE);
+      redirect_edge_var_map_empty ();
     }
 }
 

gcc/passes.c

@@ -2218,6 +2218,7 @@ execute_one_ipa_transform_pass (struct cgraph_node *node,
   pass_fini_dump_file (pass);
 
   current_pass = NULL;
+  redirect_edge_var_map_empty ();
 
   /* Signal this is a suitable GC collection point.  */
   if (!(todo_after & TODO_do_not_ggc_collect))
@@ -2370,6 +2371,7 @@ execute_one_pass (opt_pass *pass)
 		|| pass->type != RTL_PASS);
 
   current_pass = NULL;
+  redirect_edge_var_map_empty ();
 
   if (todo_after & TODO_discard_function)
     {

gcc/tree-ssa.c

@@ -119,10 +119,10 @@ redirect_edge_var_map_vector (edge e)
 /* Clear the edge variable mappings.  */
 
 void
-redirect_edge_var_map_destroy (void)
+redirect_edge_var_map_empty (void)
 {
-  delete edge_var_maps;
-  edge_var_maps = NULL;
+  if (edge_var_maps)
+    edge_var_maps->empty ();
 }
 
 
@@ -1128,7 +1128,7 @@ delete_tree_ssa (struct function *fn)
   fn->gimple_df = NULL;
 
   /* We no longer need the edge variable maps.  */
-  redirect_edge_var_map_destroy ();
+  redirect_edge_var_map_empty ();
 }
 
 /* Return true if EXPR is a useless type conversion, otherwise return

gcc/tree-ssa.h

@@ -35,7 +35,7 @@ extern void redirect_edge_var_map_add (edge, tree, tree, source_location);
 extern void redirect_edge_var_map_clear (edge);
 extern void redirect_edge_var_map_dup (edge, edge);
 extern vec<edge_var_map> *redirect_edge_var_map_vector (edge);
-extern void redirect_edge_var_map_destroy (void);
+extern void redirect_edge_var_map_empty (void);
 extern edge ssa_redirect_edge (edge, basic_block);
 extern void flush_pending_stmts (edge);
 extern void gimple_replace_ssa_lhs (gimple *, tree);