tree-flow.h (register_new_name_mapping): Remove.

2012-08-20  Richard Guenther  <rguenther@suse.de>

	* tree-flow.h (register_new_name_mapping): Remove.
	* tree-into-ssa.c (register_new_name_mapping): Likewise.
	(add_new_name_mapping): Do not push/pop timevar here.
	(create_new_def_for): Instead do it here.  Initialize
	update-ssa here, handle a NULL def.
	* tree-vrp.c (build_assert_expr_for): Use create_new_def_for.

From-SVN: r190531

gcc/ChangeLog

 2012-08-20  Richard Guenther  <rguenther@suse.de>
 
+	* tree-flow.h (register_new_name_mapping): Remove.
+	* tree-into-ssa.c (register_new_name_mapping): Likewise.
+	(add_new_name_mapping): Do not push/pop timevar here.
+	(create_new_def_for): Instead do it here.  Initialize
+	update-ssa here, handle a NULL def.
+	* tree-vrp.c (build_assert_expr_for): Use create_new_def_for.
+
+2012-08-20  Richard Guenther  <rguenther@suse.de>
+
 	PR tree-optimization/54327
 	* gimple-fold.c (get_maxval_strlen): Do not walk use-def chains
 	if the use is registered for SSA update.

gcc/tree-flow.h

@@ -516,7 +516,6 @@ void release_defs_bitset (bitmap toremove);
 /* In tree-into-ssa.c  */
 void update_ssa (unsigned);
 void delete_update_ssa (void);
-void register_new_name_mapping (tree, tree);
 tree create_new_def_for (tree, gimple, def_operand_p);
 bool need_ssa_update_p (struct function *);
 bool name_registered_for_update_p (tree);

gcc/tree-into-ssa.c

@@ -111,15 +111,15 @@ static VEC(gimple_vec, heap) *phis_to_rewrite;
 static bitmap blocks_with_phis_to_rewrite;
 
 /* Growth factor for NEW_SSA_NAMES and OLD_SSA_NAMES.  These sets need
-   to grow as the callers to register_new_name_mapping will typically
-   create new names on the fly.  FIXME.  Currently set to 1/3 to avoid
-   frequent reallocations but still need to find a reasonable growth
-   strategy.  */
+   to grow as the callers to create_new_def_for will create new names on
+   the fly.
+   FIXME.  Currently set to 1/3 to avoid frequent reallocations but still
+   need to find a reasonable growth strategy.  */
 #define NAME_SETS_GROWTH_FACTOR	(MAX (3, num_ssa_names / 3))
 
 
 /* The function the SSA updating data structures have been initialized for.
-   NULL if they need to be initialized by register_new_name_mapping.  */
+   NULL if they need to be initialized by create_new_def_for.  */
 static struct function *update_ssa_initialized_fn = NULL;
 
 /* Global data to attach to the main dominator walk structure.  */
@@ -587,8 +587,6 @@ add_to_repl_tbl (tree new_tree, tree old)
 static void
 add_new_name_mapping (tree new_tree, tree old)
 {
-  timevar_push (TV_TREE_SSA_INCREMENTAL);
-
   /* OLD and NEW_TREE must be different SSA names for the same symbol.  */
   gcc_assert (new_tree != old && SSA_NAME_VAR (new_tree) == SSA_NAME_VAR (old));
 
@@ -613,8 +611,6 @@ add_new_name_mapping (tree new_tree, tree old)
      respectively.  */
   SET_BIT (new_ssa_names, SSA_NAME_VERSION (new_tree));
   SET_BIT (old_ssa_names, SSA_NAME_VERSION (old));
-
-  timevar_pop (TV_TREE_SSA_INCREMENTAL);
 }
 
 
@@ -2842,16 +2838,28 @@ delete_update_ssa (void)
 
 
 /* Create a new name for OLD_NAME in statement STMT and replace the
-   operand pointed to by DEF_P with the newly created name.  Return
-   the new name and register the replacement mapping <NEW, OLD> in
+   operand pointed to by DEF_P with the newly created name.  If DEF_P
+   is NULL then STMT should be a GIMPLE assignment.
+   Return the new name and register the replacement mapping <NEW, OLD> in
    update_ssa's tables.  */
 
 tree
 create_new_def_for (tree old_name, gimple stmt, def_operand_p def)
 {
-  tree new_name = duplicate_ssa_name (old_name, stmt);
+  tree new_name;
 
-  SET_DEF (def, new_name);
+  timevar_push (TV_TREE_SSA_INCREMENTAL);
+
+  if (!update_ssa_initialized_fn)
+    init_update_ssa (cfun);
+
+  gcc_assert (update_ssa_initialized_fn == cfun);
+
+  new_name = duplicate_ssa_name (old_name, stmt);
+  if (def)
+    SET_DEF (def, new_name);
+  else
+    gimple_assign_set_lhs (stmt, new_name);
 
   if (gimple_code (stmt) == GIMPLE_PHI)
     {
@@ -2861,30 +2869,16 @@ create_new_def_for (tree old_name, gimple stmt, def_operand_p def)
       SSA_NAME_OCCURS_IN_ABNORMAL_PHI (new_name) = bb_has_abnormal_pred (bb);
     }
 
-  register_new_name_mapping (new_name, old_name);
+  add_new_name_mapping (new_name, old_name);
 
   /* For the benefit of passes that will be updating the SSA form on
      their own, set the current reaching definition of OLD_NAME to be
      NEW_NAME.  */
   get_ssa_name_ann (old_name)->info.current_def = new_name;
 
-  return new_name;
-}
-
-
-/* Register name NEW to be a replacement for name OLD.  This function
-   must be called for every replacement that should be performed by
-   update_ssa.  */
-
-void
-register_new_name_mapping (tree new_tree, tree old)
-{
-  if (!update_ssa_initialized_fn)
-    init_update_ssa (cfun);
-
-  gcc_assert (update_ssa_initialized_fn == cfun);
+  timevar_pop (TV_TREE_SSA_INCREMENTAL);
 
-  add_new_name_mapping (new_tree, old);
+  return new_name;
 }
 
 
@@ -3056,13 +3050,13 @@ insert_updated_phi_nodes_for (tree var, bitmap_head *dfs, bitmap blocks,
       frontier of the blocks where each of NEW_SSA_NAMES are defined.
 
    The mapping between OLD_SSA_NAMES and NEW_SSA_NAMES is setup by
-   calling register_new_name_mapping for every pair of names that the
+   calling create_new_def_for to create new defs for names that the
    caller wants to replace.
 
-   The caller identifies the new names that have been inserted and the
-   names that need to be replaced by calling register_new_name_mapping
-   for every pair <NEW, OLD>.  Note that the function assumes that the
-   new names have already been inserted in the IL.
+   The caller cretaes the new names to be inserted and the names that need
+   to be replaced by calling create_new_def_for for each old definition
+   to be replaced.  Note that the function assumes that the
+   new defining statement has already been inserted in the IL.
 
    For instance, given the following code:
 

gcc/tree-vrp.c

@@ -4152,33 +4152,20 @@ debug_all_value_ranges (void)
 static gimple
 build_assert_expr_for (tree cond, tree v)
 {
-  tree n;
+  tree a;
   gimple assertion;
 
-  gcc_assert (TREE_CODE (v) == SSA_NAME);
-  n = duplicate_ssa_name (v, NULL);
+  gcc_assert (TREE_CODE (v) == SSA_NAME
+	      && COMPARISON_CLASS_P (cond));
 
-  if (COMPARISON_CLASS_P (cond))
-    {
-      tree a = build2 (ASSERT_EXPR, TREE_TYPE (v), v, cond);
-      assertion = gimple_build_assign (n, a);
-    }
-  else if (TREE_CODE (cond) == SSA_NAME)
-    {
-      /* Given V, build the assignment N = true.  */
-      gcc_assert (v == cond);
-      assertion = gimple_build_assign (n, boolean_true_node);
-    }
-  else
-    gcc_unreachable ();
-
-  SSA_NAME_DEF_STMT (n) = assertion;
+  a = build2 (ASSERT_EXPR, TREE_TYPE (v), v, cond);
+  assertion = gimple_build_assign (NULL_TREE, a);
 
   /* The new ASSERT_EXPR, creates a new SSA name that replaces the
-     operand of the ASSERT_EXPR. Register the new name and the old one
-     in the replacement table so that we can fix the SSA web after
-     adding all the ASSERT_EXPRs.  */
-  register_new_name_mapping (n, v);
+     operand of the ASSERT_EXPR.  Create it so the new name and the old one
+     are registered in the replacement table so that we can fix the SSA web
+     after adding all the ASSERT_EXPRs.  */
+  create_new_def_for (v, assertion, NULL);
 
   return assertion;
 }