-/* Data references and dependences detectors.
- Copyright (C) 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
+/* Data references and dependences detectors.
+ Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
+ Free Software Foundation, Inc.
Contributed by Sebastian Pop <pop@cri.ensmp.fr>
This file is part of GCC.
#define GCC_TREE_DATA_REF_H
#include "graphds.h"
-#include "lambda.h"
#include "omega.h"
#include "tree-chrec.h"
reference in the innermost enclosing loop. The address is expressed as
BASE + STEP * # of iteration, and base is further decomposed as the base
pointer (BASE_ADDRESS), loop invariant offset (OFFSET) and
- constant offset (INIT). Examples, in loop nest
-
+ constant offset (INIT). Examples, in loop nest
+
for (i = 0; i < 100; i++)
for (j = 3; j < 100; j++)
Example 1 Example 2
data-ref a[j].b[i][j] *(p + x + 16B + 4B * j)
-
+
innermost_loop_behavior
base_address &a p
{
/* The object. */
tree base_object;
-
+
/* A list of chrecs. Access functions of the indices. */
VEC(tree,heap) *access_fns;
};
{
/* The alias information that should be used for new pointers to this
location. SYMBOL_TAG is either a DECL or a SYMBOL_MEMORY_TAG. */
- tree symbol_tag;
struct ptr_info_def *ptr_info;
/* The set of virtual operands corresponding to this memory reference,
bitmap vops;
};
+/* An integer vector. A vector formally consists of an element of a vector
+ space. A vector space is a set that is closed under vector addition
+ and scalar multiplication. In this vector space, an element is a list of
+ integers. */
+typedef int *lambda_vector;
+DEF_VEC_P(lambda_vector);
+DEF_VEC_ALLOC_P(lambda_vector,heap);
+DEF_VEC_ALLOC_P(lambda_vector,gc);
+
+/* An integer matrix. A matrix consists of m vectors of length n (IE
+ all vectors are the same length). */
+typedef lambda_vector *lambda_matrix;
+
/* Each vector of the access matrix represents a linear access
function for a subscript. First elements correspond to the
leftmost indices, ie. for a[i][j] the first vector corresponds to
| loop_2
| a[i+3][2*j+n-1]
- if "i" varies in loop_1 and "j" varies in loop_2, the access
+ if "i" varies in loop_1 and "j" varies in loop_2, the access
matrix with respect to the loop nest {loop_1, loop_2} is:
| loop_1 loop_2 param_n cst
*/
struct access_matrix
{
- int loop_nest_num;
+ VEC (loop_p, heap) *loop_nest;
int nb_induction_vars;
VEC (tree, heap) *parameters;
- VEC (lambda_vector, heap) *matrix;
+ VEC (lambda_vector, gc) *matrix;
};
-#define AM_LOOP_NEST_NUM(M) (M)->loop_nest_num
+#define AM_LOOP_NEST(M) (M)->loop_nest
#define AM_NB_INDUCTION_VARS(M) (M)->nb_induction_vars
#define AM_PARAMETERS(M) (M)->parameters
#define AM_MATRIX(M) (M)->matrix
static inline int
am_vector_index_for_loop (struct access_matrix *access_matrix, int loop_num)
{
- gcc_assert (loop_num >= AM_LOOP_NEST_NUM (access_matrix));
- return loop_num - AM_LOOP_NEST_NUM (access_matrix);
+ int i;
+ loop_p l;
+
+ for (i = 0; VEC_iterate (loop_p, AM_LOOP_NEST (access_matrix), i, l); i++)
+ if (l->num == loop_num)
+ return i;
+
+ gcc_unreachable();
}
int access_matrix_get_index_for_parameter (tree, struct access_matrix *);
{
/* A pointer to the statement that contains this DR. */
gimple stmt;
-
+
/* A pointer to the memory reference. */
tree ref;
/* Behavior of the memory reference in the innermost loop. */
struct innermost_loop_behavior innermost;
- /* Decomposition to indices for alias analysis. */
+ /* Subscripts of this data reference. */
struct indices indices;
/* Alias information for the data reference. */
#define DR_BASE_OBJECT(DR) (DR)->indices.base_object
#define DR_ACCESS_FNS(DR) (DR)->indices.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_NUM_DIMENSIONS(DR) VEC_length (tree, DR_ACCESS_FNS (DR))
#define DR_IS_READ(DR) (DR)->is_read
+#define DR_IS_WRITE(DR) (!DR_IS_READ (DR))
#define DR_BASE_ADDRESS(DR) (DR)->innermost.base_address
#define DR_OFFSET(DR) (DR)->innermost.offset
#define DR_INIT(DR) (DR)->innermost.init
#define DR_STEP(DR) (DR)->innermost.step
-#define DR_SYMBOL_TAG(DR) (DR)->alias.symbol_tag
#define DR_PTR_INFO(DR) (DR)->alias.ptr_info
-#define DR_VOPS(DR) (DR)->alias.vops
#define DR_ALIGNED_TO(DR) (DR)->innermost.aligned_to
#define DR_ACCESS_MATRIX(DR) (DR)->access_matrix
DEF_VEC_ALLOC_P (data_reference_p, heap);
enum data_dependence_direction {
- dir_positive,
- dir_negative,
- dir_equal,
+ dir_positive,
+ dir_negative,
+ dir_equal,
dir_positive_or_negative,
dir_positive_or_equal,
dir_negative_or_equal,
accessed twice. */
conflict_function *conflicting_iterations_in_a;
conflict_function *conflicting_iterations_in_b;
-
+
/* This field stores the information about the iteration domain
validity of the dependence relation. */
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, i.e. a constant or a
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;
-
- /* Set to true when the dependence relation is on the same data
- access. */
- bool self_reference_p;
-
/* A "yes/no/maybe" field for the dependence relation:
-
+
- when "ARE_DEPENDENT == NULL_TREE", there exist a dependence
relation between A and B, and the description of this relation
is given in the SUBSCRIPTS array,
-
+
- when "ARE_DEPENDENT == chrec_known", there is no dependence and
SUBSCRIPTS is empty,
-
+
- when "ARE_DEPENDENT == chrec_dont_know", there may be a dependence,
but the analyzer cannot be more specific. */
tree are_dependent;
-
+
/* For each subscript in the dependence test, there is an element in
this array. This is the attribute that labels the edge A->B of
the data_dependence_relation. */
/* The analyzed loop nest. */
VEC (loop_p, heap) *loop_nest;
- /* An index in loop_nest for the innermost loop that varies for
- this data dependence relation. */
- unsigned inner_loop;
-
/* The classic direction vector. */
VEC (lambda_vector, heap) *dir_vects;
/* The classic distance vector. */
VEC (lambda_vector, heap) *dist_vects;
+ /* An index in loop_nest for the innermost loop that varies for
+ this data dependence relation. */
+ unsigned inner_loop;
+
/* Is the dependence reversed with respect to the lexicographic order? */
bool reversed_p;
+
+ /* When the dependence relation is affine, it can be represented by
+ a distance vector. */
+ bool affine_p;
+
+ /* Set to true when the dependence relation is on the same data
+ access. */
+ bool self_reference_p;
};
typedef struct data_dependence_relation *ddr_p;
DEF_VEC_ALLOC_O (data_ref_loc, heap);
bool get_references_in_stmt (gimple, VEC (data_ref_loc, heap) **);
-void dr_analyze_innermost (struct data_reference *);
+bool dr_analyze_innermost (struct data_reference *, struct loop *);
extern bool compute_data_dependences_for_loop (struct loop *, bool,
+ VEC (loop_p, heap) **,
VEC (data_reference_p, heap) **,
VEC (ddr_p, heap) **);
+extern bool compute_data_dependences_for_bb (basic_block, bool,
+ VEC (data_reference_p, heap) **,
+ VEC (ddr_p, heap) **);
extern void print_direction_vector (FILE *, lambda_vector, int);
extern void print_dir_vectors (FILE *, VEC (lambda_vector, heap) *, int);
extern void print_dist_vectors (FILE *, VEC (lambda_vector, heap) *, int);
extern void dump_ddrs (FILE *, VEC (ddr_p, heap) *);
extern void dump_dist_dir_vectors (FILE *, VEC (ddr_p, heap) *);
extern void dump_data_reference (FILE *, struct data_reference *);
+extern void debug_data_reference (struct data_reference *);
extern void dump_data_references (FILE *, VEC (data_reference_p, heap) *);
+extern void debug_data_references (VEC (data_reference_p, heap) *);
extern void debug_data_dependence_relation (struct data_dependence_relation *);
-extern void dump_data_dependence_relation (FILE *,
+extern void dump_data_dependence_relation (FILE *,
struct data_dependence_relation *);
extern void dump_data_dependence_relations (FILE *, VEC (ddr_p, heap) *);
extern void debug_data_dependence_relations (VEC (ddr_p, heap) *);
-extern void dump_data_dependence_direction (FILE *,
+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 (VEC (ddr_p, heap) *);
extern void free_data_ref (data_reference_p);
extern void free_data_refs (VEC (data_reference_p, heap) *);
-struct data_reference *create_data_ref (struct loop *, tree, gimple, bool);
-bool find_loop_nest (struct loop *, VEC (loop_p, heap) **);
-void compute_all_dependences (VEC (data_reference_p, heap) *,
- VEC (ddr_p, heap) **, VEC (loop_p, heap) *, bool);
+extern bool find_data_references_in_stmt (struct loop *, gimple,
+ VEC (data_reference_p, heap) **);
+extern bool graphite_find_data_references_in_stmt (loop_p, loop_p, gimple,
+ VEC (data_reference_p, heap) **);
+struct data_reference *create_data_ref (loop_p, loop_p, tree, gimple, bool);
+extern bool find_loop_nest (struct loop *, VEC (loop_p, heap) **);
+extern struct data_dependence_relation *initialize_data_dependence_relation
+ (struct data_reference *, struct data_reference *, VEC (loop_p, heap) *);
+extern void compute_self_dependence (struct data_dependence_relation *);
+extern bool compute_all_dependences (VEC (data_reference_p, heap) *,
+ VEC (ddr_p, heap) **, VEC (loop_p, heap) *,
+ bool);
+extern tree find_data_references_in_bb (struct loop *, basic_block,
+ VEC (data_reference_p, heap) **);
+
+extern void create_rdg_vertices (struct graph *, VEC (gimple, heap) *);
+extern bool dr_may_alias_p (const struct data_reference *,
+ const struct data_reference *, bool);
+extern bool dr_equal_offsets_p (struct data_reference *,
+ struct data_reference *);
+
+
+/* Return true when the base objects of data references A and B are
+ the same memory object. */
+
+static inline bool
+same_data_refs_base_objects (data_reference_p a, data_reference_p b)
+{
+ return DR_NUM_DIMENSIONS (a) == DR_NUM_DIMENSIONS (b)
+ && operand_equal_p (DR_BASE_OBJECT (a), DR_BASE_OBJECT (b), 0);
+}
+
+/* Return true when the data references A and B are accessing the same
+ memory object with the same access functions. */
+
+static inline bool
+same_data_refs (data_reference_p a, data_reference_p b)
+{
+ unsigned int i;
+
+ /* The references are exactly the same. */
+ if (operand_equal_p (DR_REF (a), DR_REF (b), 0))
+ return true;
+
+ if (!same_data_refs_base_objects (a, b))
+ return false;
+
+ for (i = 0; i < DR_NUM_DIMENSIONS (a); i++)
+ if (!eq_evolutions_p (DR_ACCESS_FN (a, i), DR_ACCESS_FN (b, i)))
+ return false;
+
+ return true;
+}
/* Return true when the DDR contains two data references that have the
same access functions. */
{
return (DDR_ARE_DEPENDENT (ddr) == NULL_TREE
&& DR_IS_READ (DDR_A (ddr))
- && !DR_IS_READ (DDR_B (ddr))
+ && DR_IS_WRITE (DDR_B (ddr))
&& !same_access_functions (ddr));
}
return false;
}
+/* Returns the dependence level for a vector DIST of size LENGTH.
+ LEVEL = 0 means a lexicographic dependence, i.e. a dependence due
+ to the sequence of statements, not carried by any loop. */
+
+static inline unsigned
+dependence_level (lambda_vector dist_vect, int length)
+{
+ int i;
+
+ for (i = 0; i < length; i++)
+ if (dist_vect[i] != 0)
+ return i + 1;
+
+ return 0;
+}
+
/* Return the dependence level for the DDR relation. */
static inline unsigned
void debug_rdg_component (struct graph *, int);
void dump_rdg (FILE *, struct graph *);
void debug_rdg (struct graph *);
-void dot_rdg (struct graph *);
int rdg_vertex_for_stmt (struct graph *, gimple);
/* Data dependence type. */
-enum rdg_dep_type
+enum rdg_dep_type
{
/* Read After Write (RAW). */
flow_dd = 'f',
-
+
/* Write After Read (WAR). */
anti_dd = 'a',
-
+
/* Write After Write (WAW). */
- output_dd = 'o',
-
+ output_dd = 'o',
+
/* Read After Read (RAR). */
- input_dd = 'i'
+ input_dd = 'i'
};
/* Dependence information attached to an edge of the RDG. */
-typedef struct rdg_edge
+typedef struct rdg_edge
{
/* Type of the dependence. */
enum rdg_dep_type type;
- /* Levels of the dependence: the depth of the loops that
- carry the dependence. */
+ /* Levels of the dependence: the depth of the loops that carry the
+ dependence. */
unsigned level;
+
+ /* Dependence relation between data dependences, NULL when one of
+ the vertices is a scalar. */
+ ddr_p relation;
} *rdg_edge_p;
#define RDGE_TYPE(E) ((struct rdg_edge *) ((E)->data))->type
#define RDGE_LEVEL(E) ((struct rdg_edge *) ((E)->data))->level
+#define RDGE_RELATION(E) ((struct rdg_edge *) ((E)->data))->relation
-struct graph *build_rdg (struct loop *);
+struct graph *build_rdg (struct loop *,
+ VEC (loop_p, heap) **,
+ VEC (ddr_p, heap) **,
+ VEC (data_reference_p, heap) **);
+struct graph *build_empty_rdg (int);
void free_rdg (struct graph *);
/* Return the index of the variable VAR in the LOOP_NEST array. */
}
void stores_from_loop (struct loop *, VEC (gimple, heap) **);
+void stores_zero_from_loop (struct loop *, VEC (gimple, heap) **);
void remove_similar_memory_refs (VEC (gimple, heap) **);
bool rdg_defs_used_in_other_loops_p (struct graph *, int);
bool have_similar_memory_accesses (gimple, gimple);
+bool stmt_with_adjacent_zero_store_dr_p (gimple);
+
+/* Returns true when STRIDE is equal in absolute value to the size of
+ the unit type of TYPE. */
+
+static inline bool
+stride_of_unit_type_p (tree stride, tree type)
+{
+ return tree_int_cst_equal (fold_unary (ABS_EXPR, TREE_TYPE (stride),
+ stride),
+ TYPE_SIZE_UNIT (type));
+}
/* Determines whether RDG vertices V1 and V2 access to similar memory
locations, in which case they have to be in the same partition. */
RDG_STMT (rdg, v2));
}
-/* In lambda-code.c */
-bool lambda_transform_legal_p (lambda_trans_matrix, int,
- VEC (ddr_p, heap) *);
-void lambda_collect_parameters (VEC (data_reference_p, heap) *,
- VEC (tree, heap) **);
-bool lambda_compute_access_matrices (VEC (data_reference_p, heap) *,
- VEC (tree, heap) *, int);
-
-/* In tree-data-refs.c */
+/* In tree-data-ref.c */
void split_constant_offset (tree , tree *, tree *);
+/* Strongly connected components of the reduced data dependence graph. */
+
+typedef struct rdg_component
+{
+ int num;
+ VEC (int, heap) *vertices;
+} *rdgc;
+
+DEF_VEC_P (rdgc);
+DEF_VEC_ALLOC_P (rdgc, heap);
+
+DEF_VEC_P (bitmap);
+DEF_VEC_ALLOC_P (bitmap, heap);
+
+/* Compute the greatest common divisor of a VECTOR of SIZE numbers. */
+
+static inline int
+lambda_vector_gcd (lambda_vector vector, int size)
+{
+ int i;
+ int gcd1 = 0;
+
+ if (size > 0)
+ {
+ gcd1 = vector[0];
+ for (i = 1; i < size; i++)
+ gcd1 = gcd (gcd1, vector[i]);
+ }
+ return gcd1;
+}
+
+/* Allocate a new vector of given SIZE. */
+
+static inline lambda_vector
+lambda_vector_new (int size)
+{
+ return (lambda_vector) ggc_alloc_cleared_atomic (sizeof (int) * size);
+}
+
+/* Clear out vector VEC1 of length SIZE. */
+
+static inline void
+lambda_vector_clear (lambda_vector vec1, int size)
+{
+ memset (vec1, 0, size * sizeof (*vec1));
+}
+
+/* Returns true when the vector V is lexicographically positive, in
+ other words, when the first nonzero element is positive. */
+
+static inline bool
+lambda_vector_lexico_pos (lambda_vector v,
+ unsigned n)
+{
+ unsigned i;
+ for (i = 0; i < n; i++)
+ {
+ if (v[i] == 0)
+ continue;
+ if (v[i] < 0)
+ return false;
+ if (v[i] > 0)
+ return true;
+ }
+ return true;
+}
+
+/* Return true if vector VEC1 of length SIZE is the zero vector. */
+
+static inline bool
+lambda_vector_zerop (lambda_vector vec1, int size)
+{
+ int i;
+ for (i = 0; i < size; i++)
+ if (vec1[i] != 0)
+ return false;
+ return true;
+}
+
+/* Allocate a matrix of M rows x N cols. */
+
+static inline lambda_matrix
+lambda_matrix_new (int m, int n, struct obstack *lambda_obstack)
+{
+ lambda_matrix mat;
+ int i;
+
+ mat = (lambda_matrix) obstack_alloc (lambda_obstack,
+ sizeof (lambda_vector *) * m);
+
+ for (i = 0; i < m; i++)
+ mat[i] = lambda_vector_new (n);
+
+ return mat;
+}
+
#endif /* GCC_TREE_DATA_REF_H */
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