tree.h (SSA_NAME_VAR): Return NULL_TREE if an IDENTIFIER_NODE is recorded as var.

2012-08-10  Richard Guenther  <rguenther@suse.de>

	* tree.h (SSA_NAME_VAR): Return NULL_TREE if an IDENTIFIER_NODE
	is recorded as var.
	(SSA_NAME_IDENTIFIER): Return the IDENTIFIER_NODE of the SSA_NAME
	or its SSA_NAME_VAR.
	(SET_SSA_NAME_VAR_OR_IDENTIFIER): New setter.
	* tree-ssanames.c (make_ssa_name_fn): Handle creating anonymous
	SSA names by passing a type instead of a variable decl.
	(release_ssa_name): Use SET_SSA_NAME_VAR_OR_IDENTIFIER.
	(copy_ssa_name_fn): Handle anonymous SSA names.
	(replace_ssa_name_symbol): Use SET_SSA_NAME_VAR_OR_IDENTIFIER.
	* tree-flow-inline.h (make_temp_ssa_name): New inline function.
	* tree-pretty-print.c (dump_generic_node): Use SSA_NAME_IDENTIFIER,
	dump SSA names without a name as <anon>.
	* cfgexpand.c (expand_used_vars): Assing anonymous SSA names we are
	going to expand a decl.
	(gimple_expand_cfg): Assign all SSA names of a partition the
	decl we created for its leader.
	* tree-ssa.c (target_for_debug_bind): Handle SSA_NAMEs.
	(verify_ssa_name): Handle anonymous SSA names.
	(verify_def): Likewise.
	* tree-predcom.c (eliminate_temp_copies): Likewise.
	* tree-ssa-copyrename.c (copy_rename_partition_coalesce): Likewise.
	* tree-ssa-live.c (var_map_base_init): Compute conflicts for
	anonymous SSA names with the same type.
	(mark_all_vars_used_1): Handle anonymous SSA names.
	(verify_live_on_entry): Likewise.
	* tree-ssa-coalesce.c (abnormal_corrupt): Remove.
	(create_outofssa_var_map): Adjust with respect to conflicts we
	compute for anonymous SSA names.  Do not restrict abnormal
	coalescing.
	(coalesce_partitions): Do not restrict abnormal coalescing.
	Assert we only ever coalesce variables we computed conflicts for.
	* tree-ssa-ter.c (process_replaceable): Do not restrict TER
	of anonymous names.
	* expr.c (expand_expr_real_1): Handle anonymous SSA names
	expanded from IVOPTs by creating a raw REG here.
	* tree-cfg.c (replace_ssa_name): Handle anonymous SSA names.
	(dump_function_to_file): Dump anonymous SSA names alongside
	with their types in the variable list.
	(verify_gimple_return): Guard use of SSA_NAME_VAR.
	* tree-into-ssa.c (mark_for_renaming): Handle a NULL symbol.
	(rewrite_into_ssa): Make SSA names anonymous.
	* tree-ssa-structalias.c (alias_get_name): Rewrite.
	* tree-ssa-uninit.c (ssa_undefined_value_p): Handle anonymous
	SSA names.
	(warn_uninitialized_phi): Likewise.
	* tree-ssa-loop-ivopts.c (prepare_decl_rtl): Defer expanding
	anonymous SSA names to the expander.
	(determine_iv_cost): Anonymous SSA names are artificial.
	* tree-ssa-loop-manip.c (tree_transform_and_unroll_loop):
	Handle anonymous SSA names.
	* lto-streamer-out.c (output_ssa_names): Stream SSA_NAME_VAR
	or if NULL, the type of the SSA name.
	* tree-inline.c (remap_ssa_name): Handle anonymous SSA names,
	remap names as anonymous where appropriate.
	(insert_init_stmt): Pass SSA names down to insert_init_debug_bind.
	* tree-ssa-uncprop.c (uncprop_into_successor_phis): Adjust
	according to what we create conflicts for in out-of-SSA
	coalescing.
	* tree-parloops.c (separate_decls_in_region_name): Handle
	anonymous SSA names.
	(add_field_for_name): Likewise.
	* tree.c (get_name): Handle SSA names.
	* tree-ssa-loop-im.c (gen_lsm_tmp_name): Defer to get_name for
	SSA_NAMEs.
	* tree-vect-loop-manip.c (adjust_debug_stmts): Use
	virtual_operand_p.
	* tree-sra.c (create_access_replacement): Give up generating
	a DECL_DEBUG_EXPR for SSA names in the memory reference.
	(replace_removed_params_ssa_names): Guard use of SSA_NAME_VAR.
	* tree-complex.c (get_component_ssa_name): Handle anonymous
	SSA names.
	(set_component_ssa_name): Likewise.
	* tree-ssa-sccvn.c (visit_reference_op_load): Likewise.
	* tree-object-size.c (collect_object_sizes_for): Handle
	uninitialized SSA names properly.
	* ipa-inline-analysis.c (eliminated_by_inlining_prob): Guard use of
	SSA_NAME_VAR.
	* ipa-split.c (test_nonssa_use): Likewise.
	(consider_split): Likewise.
	(mark_nonssa_use): Likewise.

	c-family/
	* c-pretty-print.c (pp_c_expression): Handle anonymous SSA names.

	cp/
	* error.c (dump_expr): Likewise.

	* g++.dg/plugin/selfassign.c: Adjust.
	* gcc.dg/plugin/selfassign.c: Likewise.
	* gcc.dg/strlenopt-11.c: Likewise.
	* gcc.dg/strlenopt-13.c: Likewise.
	* gcc.dg/no-strict-overflow-4.c: Likewise.
	* gcc.dg/strict-overflow-4.c: Likewise.
	* gcc.dg/tree-ssa/alias-11.c: Likewise.
	* gcc.dg/tree-ssa/alias-6.c: Likewise.
	* gcc.dg/tree-ssa/asm-3.c: Likewise.
	* gcc.dg/tree-ssa/pr18908.c: Likewise.
	* gcc.dg/tree-ssa/pr19431.c: Likewise.
	* gcc.dg/tree-ssa/ssa-pre-21.c: Likewise.
	* gcc.dg/tree-ssa/phi-opt-10.c: Likewise.
	* gcc.dg/tree-ssa/phi-opt-7.c: Likewise.
	* gcc.dg/tree-ssa/slsr-27.c: Likewise.
	* gcc.dg/tree-ssa/slsr-28.c: Likewise.
	* gcc.dg/tree-ssa/slsr-29.c: Likewise.
	* gcc.dg/pr46309.c: Likewise.
	* gcc.dg/tree-ssa/loop-5.c: Likewise.

From-SVN: r190284

1 files changed, 26 insertions, 1 deletions

diff --git a/gcc/cfgexpand.c b/gcc/cfgexpand.c
index 9bf6af64224..c6cd4e29089 100644
--- a/gcc/cfgexpand.c
+++ b/gcc/cfgexpand.c
@@ -1453,6 +1453,7 @@ expand_used_vars (void)
 {
   tree var, outer_block = DECL_INITIAL (current_function_decl);
   VEC(tree,heap) *maybe_local_decls = NULL;
+  struct pointer_map_t *ssa_name_decls;
   unsigned i;
   unsigned len;
 
@@ -1465,11 +1466,23 @@ expand_used_vars (void)
 
   init_vars_expansion ();
 
+  ssa_name_decls = pointer_map_create ();
   for (i = 0; i < SA.map->num_partitions; i++)
     {
       tree var = partition_to_var (SA.map, i);
 
       gcc_assert (is_gimple_reg (var));
+
+      /* Assign decls to each SSA name partition, share decls for partitions
+         we could have coalesced (those with the same type).  */
+      if (SSA_NAME_VAR (var) == NULL_TREE)
+	{
+	  void **slot = pointer_map_insert (ssa_name_decls, TREE_TYPE (var));
+	  if (!*slot)
+	    *slot = (void *) create_tmp_reg (TREE_TYPE (var), NULL);
+	  replace_ssa_name_symbol (var, (tree) *slot);
+	}
+
       if (TREE_CODE (SSA_NAME_VAR (var)) == VAR_DECL)
 	expand_one_var (var, true, true);
       else
@@ -1486,6 +1499,7 @@ expand_used_vars (void)
 	    }
 	}
     }
+  pointer_map_destroy (ssa_name_decls);
 
   /* At this point all variables on the local_decls with TREE_USED
      set are not associated with any block scope.  Lay them out.  */
@@ -4450,7 +4464,6 @@ gimple_expand_cfg (void)
       rtx r;
 
       if (!name
-	  || !POINTER_TYPE_P (TREE_TYPE (name))
 	  /* We might have generated new SSA names in
 	     update_alias_info_with_stack_vars.  They will have a NULL
 	     defining statements, and won't be part of the partitioning,
@@ -4460,6 +4473,18 @@ gimple_expand_cfg (void)
       part = var_to_partition (SA.map, name);
       if (part == NO_PARTITION)
 	continue;
+
+      /* Adjust all partition members to get the underlying decl of
+	 the representative which we might have created in expand_one_var.  */
+      if (SSA_NAME_VAR (name) == NULL_TREE)
+	{
+	  tree leader = partition_to_var (SA.map, part);
+	  gcc_assert (SSA_NAME_VAR (leader) != NULL_TREE);
+	  replace_ssa_name_symbol (name, SSA_NAME_VAR (leader));
+	}
+      if (!POINTER_TYPE_P (TREE_TYPE (name)))
+	continue;
+
       r = SA.partition_to_pseudo[part];
       if (REG_P (r))
 	mark_reg_pointer (r, get_pointer_alignment (name));