/* Data references and dependences detectors.
- Copyright (C) 2003, 2004 Free Software Foundation, Inc.
+ Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
Contributed by Sebastian Pop <s.pop@laposte.net>
This file is part of GCC.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
+Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301, USA. */
#ifndef GCC_TREE_DATA_REF_H
#define GCC_TREE_DATA_REF_H
-struct data_reference GTY(())
+#include "lambda.h"
+
+/** {base_address + offset + init} is the first location accessed by data-ref
+ in the loop, and step is the stride of data-ref in the loop in bytes;
+ e.g.:
+
+ Example 1 Example 2
+ data-ref a[j].b[i][j] a + x + 16B (a is int*)
+
+First location info:
+ base_address &a a
+ offset j_0*D_j + i_0*D_i + C_a x
+ init C_b 16
+ step D_j 4
+ access_fn NULL {16, +, 1}
+
+Base object info:
+ base_object a NULL
+ access_fn <access_fns of indexes of b> NULL
+
+ **/
+struct first_location_in_loop
{
- /* An identifier. */
- unsigned int id;
+ tree base_address;
+ tree offset;
+ tree init;
+ tree step;
+ /* Access function related to first location in the loop. */
+ VEC(tree,heap) *access_fns;
+
+};
+
+struct base_object_info
+{
+ /* The object. */
+ tree base_object;
+ /* A list of chrecs. Access functions related to BASE_OBJECT. */
+ VEC(tree,heap) *access_fns;
+};
+
+enum data_ref_type {
+ ARRAY_REF_TYPE,
+ POINTER_REF_TYPE
+};
+
+struct data_reference
+{
/* A pointer to the statement that contains this DR. */
tree stmt;
/* A pointer to the ARRAY_REF node. */
tree ref;
- /* The name of the array. */
- tree base_name;
-
- /* A list of chrecs. */
- varray_type access_fns;
-
/* Auxiliary info specific to a pass. */
int aux;
/* True when the data reference is in RHS of a stmt. */
bool is_read;
+ /* First location accessed by the data-ref in the loop. */
+ struct first_location_in_loop first_location;
+
+ /* Base object related info. */
+ struct base_object_info object_info;
+
+ /* Aliasing information. This field represents the symbol that
+ should be aliased by a pointer holding the address of this data
+ reference. If the original data reference was a pointer
+ dereference, then this field contains the memory tag that should
+ be used by the new vector-pointer. */
+ tree memtag;
+ struct ptr_info_def *ptr_info;
+ subvar_t subvars;
+
+ /* Alignment information. */
+ /* The offset of the data-reference from its base in bytes. */
+ tree misalignment;
+ /* The maximum data-ref's alignment. */
+ tree aligned_to;
+
+ /* The type of the data-ref. */
+ enum data_ref_type type;
};
-#define DR_ID(DR) DR->id
-#define DR_STMT(DR) DR->stmt
-#define DR_REF(DR) DR->ref
-#define DR_BASE_NAME(DR) DR->base_name
-#define DR_ACCESS_FNS(DR) DR->access_fns
-#define DR_ACCESS_FN(DR, I) VARRAY_TREE (DR_ACCESS_FNS (DR), I)
-#define DR_NUM_DIMENSIONS(DR) VARRAY_ACTIVE_SIZE (DR_ACCESS_FNS (DR))
-#define DR_IS_READ(DR) DR->is_read
+#define DR_STMT(DR) (DR)->stmt
+#define DR_REF(DR) (DR)->ref
+#define DR_BASE_OBJECT(DR) (DR)->object_info.base_object
+#define DR_TYPE(DR) (DR)->type
+#define DR_ACCESS_FNS(DR)\
+ (DR_TYPE(DR) == ARRAY_REF_TYPE ? \
+ (DR)->object_info.access_fns : (DR)->first_location.access_fns)
+#define DR_ACCESS_FN(DR, I) VEC_index (tree, DR_ACCESS_FNS (DR), I)
+#define DR_NUM_DIMENSIONS(DR) VEC_length (tree, DR_ACCESS_FNS (DR))
+#define DR_IS_READ(DR) (DR)->is_read
+#define DR_BASE_ADDRESS(DR) (DR)->first_location.base_address
+#define DR_OFFSET(DR) (DR)->first_location.offset
+#define DR_INIT(DR) (DR)->first_location.init
+#define DR_STEP(DR) (DR)->first_location.step
+#define DR_MEMTAG(DR) (DR)->memtag
+#define DR_ALIGNED_TO(DR) (DR)->aligned_to
+#define DR_OFFSET_MISALIGNMENT(DR) (DR)->misalignment
+#define DR_PTR_INFO(DR) (DR)->ptr_info
+#define DR_SUBVARS(DR) (DR)->subvars
+
+#define DR_ACCESS_FNS_ADDR(DR) \
+ (DR_TYPE(DR) == ARRAY_REF_TYPE ? \
+ &((DR)->object_info.access_fns) : &((DR)->first_location.access_fns))
+#define DR_SET_ACCESS_FNS(DR, ACC_FNS) \
+{ \
+ if (DR_TYPE(DR) == ARRAY_REF_TYPE) \
+ (DR)->object_info.access_fns = ACC_FNS; \
+ else \
+ (DR)->first_location.access_fns = ACC_FNS; \
+}
+#define DR_FREE_ACCESS_FNS(DR) \
+{ \
+ if (DR_TYPE(DR) == ARRAY_REF_TYPE) \
+ VEC_free (tree, heap, (DR)->object_info.access_fns); \
+ else \
+ VEC_free (tree, heap, (DR)->first_location.access_fns); \
+}
enum data_dependence_direction {
dir_positive,
are stored in the data_dependence_relation structure under the form
of an array of subscripts. */
-struct subscript GTY(())
+struct subscript
{
/* A description of the iterations for which the elements are
accessed twice. */
tree conflicting_iterations_in_a;
tree conflicting_iterations_in_b;
- /* These fields store the information about the iteration domain
+ /* This field stores the information about the iteration domain
validity of the dependence relation. */
- tree last_conflict_in_a;
- tree last_conflict_in_b;
+ tree last_conflict;
/* Distance from the iteration that access a conflicting element in
A to the iteration that access this same conflicting element in
- B. The distance is a tree scalar expression, ie. a constant or a
+ B. The distance is a tree scalar expression, i.e. a constant or a
symbolic expression, but certainly not a chrec function. */
tree distance;
-
- /* Direction (or sign) of the distance. This more abstract (less
- precise) information is extracted from the distance field, for
- the convenience of some analyzers. */
- enum data_dependence_direction direction;
};
#define SUB_CONFLICTS_IN_A(SUB) SUB->conflicting_iterations_in_a
#define SUB_CONFLICTS_IN_B(SUB) SUB->conflicting_iterations_in_b
-#define SUB_LAST_CONFLICT_IN_A(SUB) SUB->last_conflict_in_a
-#define SUB_LAST_CONFLICT_IN_B(SUB) SUB->last_conflict_in_b
+#define SUB_LAST_CONFLICT(SUB) SUB->last_conflict
#define SUB_DISTANCE(SUB) SUB->distance
-#define SUB_DIRECTION(SUB) SUB->direction
/* A data_dependence_relation represents a relation between two
data_references A and B. */
-struct data_dependence_relation GTY(())
+struct data_dependence_relation
{
struct data_reference *a;
struct data_reference *b;
+ /* When the dependence relation is affine, it can be represented by
+ a distance vector. */
+ bool affine_p;
+
/* A "yes/no/maybe" field for the dependence relation:
- when "ARE_DEPENDENT == NULL_TREE", there exist a dependence
this array. This is the attribute that labels the edge A->B of
the data_dependence_relation. */
varray_type subscripts;
+
+ /* The size of the direction/distance vectors. */
+ int size_vect;
+
+ /* The classic direction vector. */
+ lambda_vector dir_vect;
+
+ /* The classic distance vector. */
+ lambda_vector dist_vect;
};
#define DDR_A(DDR) DDR->a
#define DDR_B(DDR) DDR->b
+#define DDR_AFFINE_P(DDR) DDR->affine_p
#define DDR_ARE_DEPENDENT(DDR) DDR->are_dependent
#define DDR_SUBSCRIPTS(DDR) DDR->subscripts
#define DDR_SUBSCRIPTS_VECTOR_INIT(DDR, N) \
VARRAY_GENERIC_PTR_INIT (DDR_SUBSCRIPTS (DDR), N, "subscripts_vector");
#define DDR_SUBSCRIPT(DDR, I) VARRAY_GENERIC_PTR (DDR_SUBSCRIPTS (DDR), I)
#define DDR_NUM_SUBSCRIPTS(DDR) VARRAY_ACTIVE_SIZE (DDR_SUBSCRIPTS (DDR))
+#define DDR_SIZE_VECT(DDR) DDR->size_vect
+#define DDR_DIR_VECT(DDR) DDR->dir_vect
+#define DDR_DIST_VECT(DDR) DDR->dist_vect
\f
-struct data_dependence_relation *initialize_data_dependence_relation
+extern tree find_data_references_in_loop (struct loop *, varray_type *);
+extern struct data_dependence_relation *initialize_data_dependence_relation
(struct data_reference *, struct data_reference *);
-void compute_affine_dependence (struct data_dependence_relation *);
+extern void compute_affine_dependence (struct data_dependence_relation *);
extern void analyze_all_data_dependences (struct loops *);
-extern void compute_data_dependences_for_loop (unsigned, struct loop *,
- varray_type *, varray_type *,
+extern void compute_data_dependences_for_loop (struct loop *, bool,
varray_type *, varray_type *);
-extern struct data_reference * init_data_ref (tree, tree, tree, tree);
-extern struct data_reference *analyze_array (tree, tree, bool);
+extern void dump_subscript (FILE *, struct subscript *);
+extern void dump_ddrs (FILE *, varray_type);
+extern void dump_dist_dir_vectors (FILE *, varray_type);
extern void dump_data_reference (FILE *, struct data_reference *);
extern void dump_data_references (FILE *, varray_type);
extern void dump_data_dependence_relation (FILE *,
extern void dump_data_dependence_relations (FILE *, varray_type);
extern void dump_data_dependence_direction (FILE *,
enum data_dependence_direction);
+extern void free_dependence_relation (struct data_dependence_relation *);
+extern void free_dependence_relations (varray_type);
+extern void free_data_refs (varray_type);
+extern void compute_subscript_distance (struct data_dependence_relation *);
-\f
-
-/* Inline functions. */
-/* This is the simplest data dependence test: determines whether the
- data references A and B access the same array. */
-
-static inline bool
-array_base_name_differ_p (struct data_reference *a,
- struct data_reference *b)
-{
- if (DR_BASE_NAME (a) == DR_BASE_NAME (b))
- return false;
-
- if (TREE_CODE (DR_BASE_NAME (a)) == INDIRECT_REF
- && TREE_CODE (DR_BASE_NAME (b)) == INDIRECT_REF
- && TREE_OPERAND (DR_BASE_NAME (a), 0)
- == TREE_OPERAND (DR_BASE_NAME (b), 0))
- return false;
-
- return true;
-}
+\f
#endif /* GCC_TREE_DATA_REF_H */
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