2007-11-16 Richard Guenther <rguenther@suse.de>

	PR tree-optimization/33870
	* tree.h (struct tree_memory_tag): Add base_for_components flag.
	(struct tree_struct_field_tag): Remove nesting_level field.
	(SFT_NESTING_LEVEL): Remove.
	(SFT_BASE_FOR_COMPONENTS_P): Add.
	* tree-flow.h (struct fieldoff): Remove nesting_level field.  Add
	base_for_components flag.
	(push_fields_onto_fieldstack): Remove nesting_level parameter.
	* tree-ssa-alias.c (create_sft): Likewise.  Add base_for_components
	parameter.
	(create_overlap_variables_for): Deal with it.
	* tree-dfa.c (dump_subvars_for): Likewise.
	(dump_variable): Likewise.
	* tree-ssa-structalias.c (push_fields_onto_fieldstack): Likewise.
	Set base_for_components for first elements of sub-structures.
	(create_variable_info_for): Handle base_for_components.
	(set_uids_in_ptset): Always set SFT_UNPARTITIONABLE_P for
	pointed-to SFTs if SFT_BASE_FOR_COMPONENTS_P is set.
	* tree-ssa-operands.c (ref_nesting_level): Remove.
	(add_vars_for_offset): Remove full_ref parameter, always add
	the offset of the pointed-to SFT.
	(add_virtual_operand): Adjust for changed signature of
	add_vars_for_offset.

	* gcc.dg/torture/pr33870.c: New testcase.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@130231 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 5 insertions, 6 deletions

diff --git a/gcc/tree-flow.h b/gcc/tree-flow.h
index 83761951859..4424922613c 100644
--- a/gcc/tree-flow.h
+++ b/gcc/tree-flow.h
@@ -1159,22 +1159,21 @@ struct fieldoff
   /* Field.  */
   tree decl;
 
-  /* 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;  
 
   /* Alias set for the field.  */
   alias_set_type alias_set;
+
+  /* True, if this offset can be a base for further component accesses.  */
+  unsigned base_for_components : 1;
 };
 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, unsigned);
+int push_fields_onto_fieldstack (tree, VEC(fieldoff_s,heap) **,
+				 HOST_WIDE_INT, bool *, tree);
 void sort_fieldstack (VEC(fieldoff_s,heap) *);
 
 void init_alias_heapvars (void);