pr 33870

	pr 33870
	* tree.h (strcut tree_memory_tag): add field unpartitionable.
	remove field in_nested_struct.
	(struct tree_struct_field_tag): add field nesting_level.
	(sft_in_nested_struct): remove.
	(sft_nesting_level): define.
	(sft_unpartitionable_p): define.
	* tree-ssa-alias.c (mem_sym_score): if mp->var is not
	partitionable, return long_max.
	(compute_memory_partitions): do not partition sfts marked
	unpartitionable.
	(create_sft): add argument nesting_level.  set
	sft_nesting_level with it.  update all users.
	(create_overlap_variables_for): show nesting level.
	* tree-dfa.c (dump_subvars_for): likewise.
	(dump_variable): likewise.
	show whether the sft is partitionable or not.
	* tree-flow.h (struct fieldoff): remove field
	in_nested_struct.
	add field nesting_level.
	* tree-ssa-structalias.c (struct variable_info): remove
	field in_nested_struct.
	(push_fields_onto_fieldstack): add argument
	nesting_level.  update all users.
	update documentation.
	update pair->nesting_level with nesting_level.
	make recursive calls with nesting_level + 1.
	(set_uids_in_ptset): if an sft is added to the points-to
	set, mark it as unpartitionable.
	* tree-ssa-operands.c (ref_nesting_level): new.
	(add_vars_for_offset): call it.
	add argument full_ref.  update
	callers.
	if var is inside a nested structure and the nesting level
	of full_ref is lower than the nesting level of var,
	adjust offset by the offset of var.

testsuite/ChangeLog
	
	PR 33870
	* gcc.c-torture/execute/pr33870-1.c: New test.
	* gcc.dg/tree-ssa/alias-16.c: New test.

From-SVN: r130141

1 files changed, 12 insertions, 1 deletions

diff --git a/gcc/tree-dfa.c b/gcc/tree-dfa.c
index 4880e83..65a32d9 100644
--- a/gcc/tree-dfa.c
+++ b/gcc/tree-dfa.c
@@ -287,7 +287,9 @@ dump_subvars_for (FILE *file, tree var)
   for (i = 0; VEC_iterate (tree, sv, i, subvar); ++i)
     {
       print_generic_expr (file, subvar, dump_flags);
-      fprintf (file, "@" HOST_WIDE_INT_PRINT_UNSIGNED " ", SFT_OFFSET (subvar));
+      fprintf (file, "@" HOST_WIDE_INT_PRINT_UNSIGNED, SFT_OFFSET (subvar));
+      fprintf (file, "[%u]", SFT_NESTING_LEVEL (subvar));
+      fprintf (file, " ");
     }
 
   fprintf (file, "}");
@@ -417,6 +419,15 @@ dump_variable (FILE *file, tree var)
 	  fprintf (file, ", partition symbols: ");
 	  dump_decl_set (file, MPT_SYMBOLS (var));
 	}
+
+      if (TREE_CODE (var) == STRUCT_FIELD_TAG)
+	{
+	  fprintf (file, ", offset: " HOST_WIDE_INT_PRINT_UNSIGNED,
+		   SFT_OFFSET (var));
+	  fprintf (file, ", nesting: %u", SFT_NESTING_LEVEL (var));
+	  fprintf (file, ", partitionable: %s",
+		   SFT_UNPARTITIONABLE_P (var) ? "NO" : "YES");
+	}
     }
 
   fprintf (file, "\n");