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, 5 insertions, 5 deletions

diff --git a/gcc/tree-flow.h b/gcc/tree-flow.h
index 02e9543..8376195 100644
--- a/gcc/tree-flow.h
+++ b/gcc/tree-flow.h
@@ -1159,9 +1159,9 @@ struct fieldoff
   /* Field.  */
   tree decl;
 
-  /* True if this field is inside a structure nested inside the base
-     containing object.  */
-  unsigned int in_nested_struct : 1;
+  /* Nesting level.  This number represents how many structures are
+     wrapping this field.  */
+  unsigned nesting_level;
 
   /* Offset from the base of the base containing object to this field.  */
   HOST_WIDE_INT offset;  
@@ -1173,8 +1173,8 @@ typedef struct fieldoff fieldoff_s;
 
 DEF_VEC_O(fieldoff_s);
 DEF_VEC_ALLOC_O(fieldoff_s,heap);
-int push_fields_onto_fieldstack (tree, VEC(fieldoff_s,heap) **,
-				 HOST_WIDE_INT, bool *, tree);
+int push_fields_onto_fieldstack (tree, VEC(fieldoff_s,heap) **, HOST_WIDE_INT,
+				 bool *, tree, unsigned);
 void sort_fieldstack (VEC(fieldoff_s,heap) *);
 
 void init_alias_heapvars (void);