GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 2, or (at your option) any later
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
for more details.
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, 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
#ifndef GCC_TREE_DATA_REF_H
#define GCC_TREE_DATA_REF_H
+#include "graphds.h"
#include "lambda.h"
#include "omega.h"
+#include "tree-chrec.h"
/*
innermost_loop_behavior describes the evolution of the address of the memory
Example 1 Example 2
data-ref a[j].b[i][j] *(p + x + 16B + 4B * j)
+
innermost_loop_behavior
base_address &a p
offset i * D_i x
/* 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;
- subvar_t subvars;
struct ptr_info_def *ptr_info;
/* The set of virtual operands corresponding to this memory reference,
tree ref;
/* Auxiliary info specific to a pass. */
- int aux;
+ void *aux;
/* True when the data reference is in RHS of a stmt. */
bool is_read;
#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_SUBVARS(DR) (DR)->alias.subvars
#define DR_VOPS(DR) (DR)->alias.vops
#define DR_ALIGNED_TO(DR) (DR)->innermost.aligned_to
/* The classic distance vector. */
VEC (lambda_vector, heap) *dist_vects;
+
+ /* Is the dependence reversed with respect to the lexicographic order? */
+ bool reversed_p;
};
typedef struct data_dependence_relation *ddr_p;
VEC_index (lambda_vector, DDR_DIR_VECTS (DDR), I)
#define DDR_DIST_VECT(DDR, I) \
VEC_index (lambda_vector, DDR_DIST_VECTS (DDR), I)
+#define DDR_REVERSED_P(DDR) DDR->reversed_p
\f
DEF_VEC_ALLOC_O (data_ref_loc, heap);
bool get_references_in_stmt (tree, VEC (data_ref_loc, heap) **);
+void dr_analyze_innermost (struct data_reference *);
extern void compute_data_dependences_for_loop (struct loop *, bool,
VEC (data_reference_p, heap) **,
VEC (ddr_p, heap) **);
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 *,
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, tree, 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);
+
+/* Return true when the DDR contains two data references that have the
+ same access functions. */
+
+static inline bool
+same_access_functions (const struct data_dependence_relation *ddr)
+{
+ unsigned i;
+
+ for (i = 0; i < DDR_NUM_SUBSCRIPTS (ddr); i++)
+ if (!eq_evolutions_p (DR_ACCESS_FN (DDR_A (ddr), i),
+ DR_ACCESS_FN (DDR_B (ddr), i)))
+ return false;
+
+ return true;
+}
+
+/* Return true when DDR is an anti-dependence relation. */
+
+static inline bool
+ddr_is_anti_dependent (ddr_p ddr)
+{
+ return (DDR_ARE_DEPENDENT (ddr) == NULL_TREE
+ && DR_IS_READ (DDR_A (ddr))
+ && !DR_IS_READ (DDR_B (ddr))
+ && !same_access_functions (ddr));
+}
+
+/* Return true when DEPENDENCE_RELATIONS contains an anti-dependence. */
+static inline bool
+ddrs_have_anti_deps (VEC (ddr_p, heap) *dependence_relations)
+{
+ unsigned i;
+ ddr_p ddr;
+
+ for (i = 0; VEC_iterate (ddr_p, dependence_relations, i, ddr); i++)
+ if (ddr_is_anti_dependent (ddr))
+ return true;
+
+ return false;
+}
+
+/* Return the dependence level for the DDR relation. */
+
+static inline unsigned
+ddr_dependence_level (ddr_p ddr)
+{
+ unsigned vector;
+ unsigned level = 0;
+
+ if (DDR_DIST_VECTS (ddr))
+ level = dependence_level (DDR_DIST_VECT (ddr, 0), DDR_NB_LOOPS (ddr));
+
+ for (vector = 1; vector < DDR_NUM_DIST_VECTS (ddr); vector++)
+ level = MIN (level, dependence_level (DDR_DIST_VECT (ddr, vector),
+ DDR_NB_LOOPS (ddr)));
+ return level;
+}
+
+\f
+
+/* A Reduced Dependence Graph (RDG) vertex representing a statement. */
+typedef struct rdg_vertex
+{
+ /* The statement represented by this vertex. */
+ tree stmt;
+
+ /* True when the statement contains a write to memory. */
+ bool has_mem_write;
+
+ /* True when the statement contains a read from memory. */
+ bool has_mem_reads;
+} *rdg_vertex_p;
+
+#define RDGV_STMT(V) ((struct rdg_vertex *) ((V)->data))->stmt
+#define RDGV_HAS_MEM_WRITE(V) ((struct rdg_vertex *) ((V)->data))->has_mem_write
+#define RDGV_HAS_MEM_READS(V) ((struct rdg_vertex *) ((V)->data))->has_mem_reads
+#define RDG_STMT(RDG, I) RDGV_STMT (&(RDG->vertices[I]))
+#define RDG_MEM_WRITE_STMT(RDG, I) RDGV_HAS_MEM_WRITE (&(RDG->vertices[I]))
+#define RDG_MEM_READS_STMT(RDG, I) RDGV_HAS_MEM_READS (&(RDG->vertices[I]))
+
+void dump_rdg_vertex (FILE *, struct graph *, int);
+void debug_rdg_vertex (struct graph *, int);
+void dump_rdg_component (FILE *, struct graph *, int, bitmap);
+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 *, tree);
+
+/* Data dependence 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',
+
+ /* Read After Read (RAR). */
+ input_dd = 'i'
+};
+
+/* Dependence information attached to an edge of the RDG. */
+
+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. */
+ unsigned level;
+} *rdg_edge_p;
+
+#define RDGE_TYPE(E) ((struct rdg_edge *) ((E)->data))->type
+#define RDGE_LEVEL(E) ((struct rdg_edge *) ((E)->data))->level
+
+struct graph *build_rdg (struct loop *);
+void free_rdg (struct graph *);
/* Return the index of the variable VAR in the LOOP_NEST array. */
return var_index;
}
+void stores_from_loop (struct loop *, VEC (tree, heap) **);
+void remove_similar_memory_refs (VEC (tree, heap) **);
+bool rdg_defs_used_in_other_loops_p (struct graph *, int);
+bool have_similar_memory_accesses (tree, tree);
+
+/* Determines whether RDG vertices V1 and V2 access to similar memory
+ locations, in which case they have to be in the same partition. */
+
+static inline bool
+rdg_has_similar_memory_accesses (struct graph *rdg, int v1, int v2)
+{
+ return have_similar_memory_accesses (RDG_STMT (rdg, v1),
+ RDG_STMT (rdg, v2));
+}
+
/* In lambda-code.c */
bool lambda_transform_legal_p (lambda_trans_matrix, int, VEC (ddr_p, heap) *);
+/* In tree-data-refs.c */
+void split_constant_offset (tree , tree *, tree *);
+
#endif /* GCC_TREE_DATA_REF_H */
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