reductions. */
if (simple_iv (loop, loop, res, &iv, true))
{
- gsi_next (psi);
+ if (integer_zerop (iv.step))
+ remove_invariant_phi (region, psi);
+ else
+ gsi_next (psi);
+
return false;
}
struct data_reference *dr;
for (i = 0; VEC_iterate (data_reference_p, datarefs, i, dr); i++)
- if (!dr->aux)
+ if (dr->aux)
{
- free (dr->aux);
+ base_alias_pair *bap = (base_alias_pair *)(dr->aux);
+
+ if (bap->alias_set)
+ free (bap->alias_set);
+
+ free (bap);
dr->aux = NULL;
}
}
-
/* Frees GBB. */
static void
information. */
static void
-try_generate_gimple_bb (scop_p scop, basic_block bb)
+try_generate_gimple_bb (scop_p scop, basic_block bb, sbitmap reductions)
{
VEC (data_reference_p, heap) *drs = VEC_alloc (data_reference_p, heap, 5);
loop_p nest = outermost_loop_in_sese (SCOP_REGION (scop), bb);
if (!graphite_stmt_p (SCOP_REGION (scop), bb, drs))
free_data_refs (drs);
else
- new_poly_bb (scop, new_gimple_bb (bb, drs));
+ new_poly_bb (scop, new_gimple_bb (bb, drs), TEST_BIT (reductions,
+ bb->index));
}
/* Returns true if all predecessors of BB, that are not dominated by BB, are
/* Recursive helper function for build_scops_bbs. */
static void
-build_scop_bbs_1 (scop_p scop, sbitmap visited, basic_block bb)
+build_scop_bbs_1 (scop_p scop, sbitmap visited, basic_block bb, sbitmap reductions)
{
sese region = SCOP_REGION (scop);
VEC (basic_block, heap) *dom;
|| !bb_in_sese_p (bb, region))
return;
- try_generate_gimple_bb (scop, bb);
+ try_generate_gimple_bb (scop, bb, reductions);
SET_BIT (visited, bb->index);
dom = get_dominated_by (CDI_DOMINATORS, bb);
for (i = 0; VEC_iterate (basic_block, dom, i, dom_bb); i++)
if (all_non_dominated_preds_marked_p (dom_bb, visited))
{
- build_scop_bbs_1 (scop, visited, dom_bb);
+ build_scop_bbs_1 (scop, visited, dom_bb, reductions);
VEC_unordered_remove (basic_block, dom, i);
break;
}
/* Gather the basic blocks belonging to the SCOP. */
-void
-build_scop_bbs (scop_p scop)
+static void
+build_scop_bbs (scop_p scop, sbitmap reductions)
{
sbitmap visited = sbitmap_alloc (last_basic_block);
sese region = SCOP_REGION (scop);
sbitmap_zero (visited);
- build_scop_bbs_1 (scop, visited, SESE_ENTRY_BB (region));
-
+ build_scop_bbs_1 (scop, visited, SESE_ENTRY_BB (region), reductions);
sbitmap_free (visited);
}
ppl_delete_Coefficient (coef);
}
-/* Saves in NV at index I a new name for variable P. */
-
-static void
-save_var_name (char **nv, int i, tree p)
-{
- const char *name = get_name (SSA_NAME_VAR (p));
-
- if (name)
- {
- int len = strlen (name) + 16;
- nv[i] = XNEWVEC (char, len);
- snprintf (nv[i], len, "%s_%d", name, SSA_NAME_VERSION (p));
- }
- else
- {
- nv[i] = XNEWVEC (char, 16);
- snprintf (nv[i], 2 + 16, "T_%d", SSA_NAME_VERSION (p));
- }
-}
-
/* When parameter NAME is in REGION, returns its index in SESE_PARAMS.
Otherwise returns -1. */
gcc_assert (SESE_ADD_PARAMS (region));
i = VEC_length (tree, SESE_PARAMS (region));
- save_var_name (SESE_PARAMS_NAMES (region), i, name);
- save_clast_name_index (SESE_PARAMS_INDEX (region),
- SESE_PARAMS_NAMES (region)[i], i);
VEC_safe_push (tree, heap, SESE_PARAMS (region), name);
return i;
}
scop_set_nb_params (scop, sese_nb_params (region));
SESE_ADD_PARAMS (region) = false;
+
+ ppl_new_Pointset_Powerset_C_Polyhedron_from_space_dimension
+ (&SCOP_CONTEXT (scop), scop_nb_params (scop), 0);
}
/* Returns a gimple_bb from BB. */
static void
build_loop_iteration_domains (scop_p scop, struct loop *loop,
- ppl_Polyhedron_t outer_ph, int nb)
-
+ ppl_Polyhedron_t outer_ph, int nb,
+ ppl_Pointset_Powerset_C_Polyhedron_t *domains)
{
int i;
ppl_Polyhedron_t ph;
Value one;
ppl_Constraint_t ub;
ppl_Linear_Expression_t ub_expr;
+ double_int nit;
value_init (one);
value_set_si (one, 1);
scan_tree_for_params (SCOP_REGION (scop), nb_iters, ub_expr, one);
value_clear (one);
+ /* N <= estimated_nb_iters
+
+ FIXME: This is a workaround that should go away once we will
+ have the PIP algorithm. */
+ if (estimated_loop_iterations (loop, true, &nit))
+ {
+ Value val;
+ ppl_Linear_Expression_t nb_iters_le;
+ ppl_Polyhedron_t pol;
+ graphite_dim_t n = scop_nb_params (scop);
+ ppl_Coefficient_t coef;
+
+ ppl_new_C_Polyhedron_from_space_dimension (&pol, dim, 0);
+ ppl_new_Linear_Expression_from_Linear_Expression (&nb_iters_le,
+ ub_expr);
+
+ /* Construct the negated number of last iteration in VAL. */
+ value_init (val);
+ mpz_set_double_int (val, nit, false);
+ value_sub_int (val, val, 1);
+ value_oppose (val, val);
+
+ /* NB_ITERS_LE holds number of last iteration in parametrical form.
+ Subtract estimated number of last iteration and assert that result
+ is not positive. */
+ ppl_new_Coefficient_from_mpz_t (&coef, val);
+ ppl_Linear_Expression_add_to_inhomogeneous (nb_iters_le, coef);
+ ppl_delete_Coefficient (coef);
+ ppl_new_Constraint (&ub, nb_iters_le,
+ PPL_CONSTRAINT_TYPE_LESS_OR_EQUAL);
+ ppl_Polyhedron_add_constraint (pol, ub);
+
+ /* Remove all but last N dimensions from POL to obtain constraints
+ on parameters. */
+ {
+ ppl_dimension_type *dims = XNEWVEC (ppl_dimension_type, dim - n);
+ graphite_dim_t i;
+ for (i = 0; i < dim - n; i++)
+ dims[i] = i;
+ ppl_Polyhedron_remove_space_dimensions (pol, dims, dim - n);
+ XDELETEVEC (dims);
+ }
+
+ /* Add constraints on parameters to SCoP context. */
+ {
+ ppl_Pointset_Powerset_C_Polyhedron_t constraints_ps;
+ ppl_new_Pointset_Powerset_C_Polyhedron_from_C_Polyhedron
+ (&constraints_ps, pol);
+ ppl_Pointset_Powerset_C_Polyhedron_intersection_assign
+ (SCOP_CONTEXT (scop), constraints_ps);
+ ppl_delete_Pointset_Powerset_C_Polyhedron (constraints_ps);
+ }
+
+ ppl_delete_Polyhedron (pol);
+ ppl_delete_Linear_Expression (nb_iters_le);
+ ppl_delete_Constraint (ub);
+ value_clear (val);
+ }
+
/* loop_i <= expr_nb_iters */
ppl_set_coef (ub_expr, nb, -1);
ppl_new_Constraint (&ub, ub_expr, PPL_CONSTRAINT_TYPE_GREATER_OR_EQUAL);
gcc_unreachable ();
if (loop->inner && loop_in_sese_p (loop->inner, region))
- build_loop_iteration_domains (scop, loop->inner, ph, nb + 1);
+ build_loop_iteration_domains (scop, loop->inner, ph, nb + 1, domains);
if (nb != 0
&& loop->next
&& loop_in_sese_p (loop->next, region))
- build_loop_iteration_domains (scop, loop->next, outer_ph, nb);
+ build_loop_iteration_domains (scop, loop->next, outer_ph, nb, domains);
ppl_new_Pointset_Powerset_C_Polyhedron_from_C_Polyhedron
- ((ppl_Pointset_Powerset_C_Polyhedron_t *) &loop->aux, ph);
+ (&domains[loop->num], ph);
ppl_delete_Polyhedron (ph);
}
build_scop_context (scop_p scop)
{
ppl_Polyhedron_t context;
+ ppl_Pointset_Powerset_C_Polyhedron_t ps;
graphite_dim_t p, n = scop_nb_params (scop);
ppl_new_C_Polyhedron_from_space_dimension (&context, n, 0);
add_param_constraints (scop, context, p);
ppl_new_Pointset_Powerset_C_Polyhedron_from_C_Polyhedron
- (&SCOP_CONTEXT (scop), context);
+ (&ps, context);
+ ppl_Pointset_Powerset_C_Polyhedron_intersection_assign
+ (SCOP_CONTEXT (scop), ps);
+ ppl_delete_Pointset_Powerset_C_Polyhedron (ps);
ppl_delete_Polyhedron (context);
}
int i;
ppl_Polyhedron_t ph;
poly_bb_p pbb;
+ int nb_loops = number_of_loops ();
+ ppl_Pointset_Powerset_C_Polyhedron_t *domains
+ = XNEWVEC (ppl_Pointset_Powerset_C_Polyhedron_t, nb_loops);
+
+ for (i = 0; i < nb_loops; i++)
+ domains[i] = NULL;
ppl_new_C_Polyhedron_from_space_dimension (&ph, scop_nb_params (scop), 0);
for (i = 0; VEC_iterate (loop_p, SESE_LOOP_NEST (region), i, loop); i++)
if (!loop_in_sese_p (loop_outer (loop), region))
- build_loop_iteration_domains (scop, loop, ph, 0);
+ build_loop_iteration_domains (scop, loop, ph, 0, domains);
for (i = 0; VEC_iterate (poly_bb_p, SCOP_BBS (scop), i, pbb); i++)
- if (gbb_loop (PBB_BLACK_BOX (pbb))->aux)
+ if (domains[gbb_loop (PBB_BLACK_BOX (pbb))->num])
ppl_new_Pointset_Powerset_C_Polyhedron_from_Pointset_Powerset_C_Polyhedron
(&PBB_DOMAIN (pbb), (ppl_const_Pointset_Powerset_C_Polyhedron_t)
- gbb_loop (PBB_BLACK_BOX (pbb))->aux);
+ domains[gbb_loop (PBB_BLACK_BOX (pbb))->num]);
else
ppl_new_Pointset_Powerset_C_Polyhedron_from_C_Polyhedron
(&PBB_DOMAIN (pbb), ph);
- for (i = 0; VEC_iterate (loop_p, SESE_LOOP_NEST (region), i, loop); i++)
- if (loop->aux)
- {
- ppl_delete_Pointset_Powerset_C_Polyhedron
- ((ppl_Pointset_Powerset_C_Polyhedron_t) loop->aux);
- loop->aux = NULL;
- }
+ for (i = 0; i < nb_loops; i++)
+ if (domains[i])
+ ppl_delete_Pointset_Powerset_C_Polyhedron (domains[i]);
ppl_delete_Polyhedron (ph);
+ free (domains);
}
/* Add a constrain to the ACCESSES polyhedron for the alias set of
ppl_Linear_Expression_t alias;
ppl_Constraint_t cstr;
int alias_set_num = 0;
+ base_alias_pair *bap = (base_alias_pair *)(dr->aux);
- if (dr->aux != NULL)
- alias_set_num = ((int *)(dr->aux))[ALIAS_SET_INDEX];
+ if (bap && bap->alias_set)
+ alias_set_num = *(bap->alias_set);
ppl_new_Linear_Expression_with_dimension (&alias, accessp_nb_dims);
high = array_ref_up_bound (ref);
- /* high - subscript >= 0
- XXX: 1-element arrays at end of structures may extend over their
- declared size. */
- if (high && host_integerp (high, 0))
+ /* high - subscript >= 0 */
+ if (high && host_integerp (high, 0)
+ /* 1-element arrays at end of structures may extend over
+ their declared size. */
+ && !(array_at_struct_end_p (ref)
+ && operand_equal_p (low, high, 0)))
{
ppl_new_Linear_Expression_with_dimension (&expr, accessp_nb_dims);
ppl_set_coef (expr, subscript, -1);
accesses);
ppl_delete_Polyhedron (accesses);
- dr_base_object_set = ((int *)(dr->aux))[BASE_OBJECT_SET_INDEX];
+ if (dr->aux)
+ dr_base_object_set = ((base_alias_pair *)(dr->aux))->base_obj_set;
new_poly_dr (pbb, dr_base_object_set, accesses_ps, DR_IS_READ (dr) ? PDR_READ : PDR_WRITE,
dr, DR_NUM_DIMENSIONS (dr));
}
-/* Write to FILE the alias graph of data references with DIMACS format. */
+/* Write to FILE the alias graph of data references in DIMACS format. */
static inline bool
write_alias_graph_to_ascii_dimacs (FILE *file, char *comment,
return true;
}
-static void
-partition_drs_to_sets (VEC (data_reference_p, heap) *drs, int choice,
- bool (* edge_exist_p) (const struct data_reference *,
- const struct data_reference *))
+/* Write to FILE the alias graph of data references in DOT format. */
+
+static inline bool
+write_alias_graph_to_ascii_dot (FILE *file, char *comment,
+ VEC (data_reference_p, heap) *drs)
{
int num_vertex = VEC_length (data_reference_p, drs);
- struct graph *g = new_graph (num_vertex);
data_reference_p dr1, dr2;
int i, j;
- int num_component;
- int *queue;
+
+ if (num_vertex == 0)
+ return true;
+
+ fprintf (file, "$\n");
+
+ if (comment)
+ fprintf (file, "c %s\n", comment);
+
+ /* First print all the vertices. */
+ for (i = 0; VEC_iterate (data_reference_p, drs, i, dr1); i++)
+ fprintf (file, "n%d;\n", i);
for (i = 0; VEC_iterate (data_reference_p, drs, i, dr1); i++)
for (j = i + 1; VEC_iterate (data_reference_p, drs, j, dr2); j++)
- if ((*edge_exist_p) (dr1, dr2))
- {
- add_edge (g, i, j);
- add_edge (g, j, i);
- }
+ if (dr_may_alias_p (dr1, dr2))
+ fprintf (file, "n%d n%d\n", i, j);
- queue = XNEWVEC (int, num_vertex);
- for (i = 0; i < num_vertex; i++)
- queue[i] = i;
+ return true;
+}
- num_component = graphds_dfs (g, queue, num_vertex, NULL, true, NULL);
+/* Write to FILE the alias graph of data references in ECC format. */
- for (i = 0; i < g->n_vertices; i++)
- {
- data_reference_p dr = VEC_index (data_reference_p, drs, i);
- if (!dr->aux)
- dr->aux = XNEWVEC (int, 2);
- ((int *)(dr->aux))[choice] = g->vertices[i].component + 1;
- }
+static inline bool
+write_alias_graph_to_ascii_ecc (FILE *file, char *comment,
+ VEC (data_reference_p, heap) *drs)
+{
+ int num_vertex = VEC_length (data_reference_p, drs);
+ data_reference_p dr1, dr2;
+ int i, j;
- free (queue);
- free_graph (g);
+ if (num_vertex == 0)
+ return true;
+
+ fprintf (file, "$\n");
+
+ if (comment)
+ fprintf (file, "c %s\n", comment);
+
+ for (i = 0; VEC_iterate (data_reference_p, drs, i, dr1); i++)
+ for (j = i + 1; VEC_iterate (data_reference_p, drs, j, dr2); j++)
+ if (dr_may_alias_p (dr1, dr2))
+ fprintf (file, "%d %d\n", i, j);
+
+ return true;
}
+/* Check if DR1 and DR2 are in the same object set. */
+
static bool
dr_same_base_object_p (const struct data_reference *dr1,
const struct data_reference *dr2)
return operand_equal_p (DR_BASE_OBJECT (dr1), DR_BASE_OBJECT (dr2), 0);
}
-/* Group each data reference in DRS with it's alias set num. */
+/* Uses DFS component number as representative of alias-sets. Also tests for
+ optimality by verifying if every connected component is a clique. Returns
+ true (1) if the above test is true, and false (0) otherwise. */
-static void
-build_alias_set_for_drs (VEC (data_reference_p, heap) *drs)
+static int
+build_alias_set_optimal_p (VEC (data_reference_p, heap) *drs)
{
- partition_drs_to_sets (drs, ALIAS_SET_INDEX, dr_may_alias_p);
+ int num_vertices = VEC_length (data_reference_p, drs);
+ struct graph *g = new_graph (num_vertices);
+ data_reference_p dr1, dr2;
+ int i, j;
+ int num_connected_components;
+ int v_indx1, v_indx2, num_vertices_in_component;
+ int *all_vertices;
+ int *vertices;
+ struct graph_edge *e;
+ int this_component_is_clique;
+ int all_components_are_cliques = 1;
+
+ for (i = 0; VEC_iterate (data_reference_p, drs, i, dr1); i++)
+ for (j = i+1; VEC_iterate (data_reference_p, drs, j, dr2); j++)
+ if (dr_may_alias_p (dr1, dr2))
+ {
+ add_edge (g, i, j);
+ add_edge (g, j, i);
+ }
+
+ all_vertices = XNEWVEC (int, num_vertices);
+ vertices = XNEWVEC (int, num_vertices);
+ for (i = 0; i < num_vertices; i++)
+ all_vertices[i] = i;
+
+ num_connected_components = graphds_dfs (g, all_vertices, num_vertices,
+ NULL, true, NULL);
+ for (i = 0; i < g->n_vertices; i++)
+ {
+ data_reference_p dr = VEC_index (data_reference_p, drs, i);
+ base_alias_pair *bap;
+
+ if (dr->aux)
+ bap = (base_alias_pair *)(dr->aux);
+
+ bap->alias_set = XNEW (int);
+ *(bap->alias_set) = g->vertices[i].component + 1;
+ }
+
+ /* Verify if the DFS numbering results in optimal solution. */
+ for (i = 0; i < num_connected_components; i++)
+ {
+ num_vertices_in_component = 0;
+ /* Get all vertices whose DFS component number is the same as i. */
+ for (j = 0; j < num_vertices; j++)
+ if (g->vertices[j].component == i)
+ vertices[num_vertices_in_component++] = j;
+
+ /* Now test if the vertices in 'vertices' form a clique, by testing
+ for edges among each pair. */
+ this_component_is_clique = 1;
+ for (v_indx1 = 0; v_indx1 < num_vertices_in_component; v_indx1++)
+ {
+ for (v_indx2 = v_indx1+1; v_indx2 < num_vertices_in_component; v_indx2++)
+ {
+ /* Check if the two vertices are connected by iterating
+ through all the edges which have one of these are source. */
+ e = g->vertices[vertices[v_indx2]].pred;
+ while (e)
+ {
+ if (e->src == vertices[v_indx1])
+ break;
+ e = e->pred_next;
+ }
+ if (!e)
+ {
+ this_component_is_clique = 0;
+ break;
+ }
+ }
+ if (!this_component_is_clique)
+ all_components_are_cliques = 0;
+ }
+ }
+
+ free (all_vertices);
+ free (vertices);
+ free_graph (g);
+ return all_components_are_cliques;
}
/* Group each data reference in DRS with it's base object set num. */
static void
build_base_obj_set_for_drs (VEC (data_reference_p, heap) *drs)
{
- partition_drs_to_sets (drs, BASE_OBJECT_SET_INDEX, dr_same_base_object_p);
+ int num_vertex = VEC_length (data_reference_p, drs);
+ struct graph *g = new_graph (num_vertex);
+ data_reference_p dr1, dr2;
+ int i, j;
+ int *queue;
+
+ for (i = 0; VEC_iterate (data_reference_p, drs, i, dr1); i++)
+ for (j = i + 1; VEC_iterate (data_reference_p, drs, j, dr2); j++)
+ if (dr_same_base_object_p (dr1, dr2))
+ {
+ add_edge (g, i, j);
+ add_edge (g, j, i);
+ }
+
+ queue = XNEWVEC (int, num_vertex);
+ for (i = 0; i < num_vertex; i++)
+ queue[i] = i;
+
+ graphds_dfs (g, queue, num_vertex, NULL, true, NULL);
+
+ for (i = 0; i < g->n_vertices; i++)
+ {
+ data_reference_p dr = VEC_index (data_reference_p, drs, i);
+ base_alias_pair *bap;
+
+ if (dr->aux)
+ bap = (base_alias_pair *)(dr->aux);
+
+ bap->base_obj_set = g->vertices[i].component + 1;
+ }
+
+ free (queue);
+ free_graph (g);
}
/* Build the data references for PBB. */
build_poly_dr (dr, pbb);
}
+/* Dump to file the alias graphs for the data references in DRS. */
+
+static void
+dump_alias_graphs (VEC (data_reference_p, heap) *drs)
+{
+ char comment[100];
+ FILE *file_dimacs, *file_ecc, *file_dot;
+
+ file_dimacs = fopen ("/tmp/dr_alias_graph_dimacs", "ab");
+ if (file_dimacs)
+ {
+ snprintf (comment, sizeof (comment), "%s %s", main_input_filename,
+ current_function_name ());
+ write_alias_graph_to_ascii_dimacs (file_dimacs, comment, drs);
+ fclose (file_dimacs);
+ }
+
+ file_ecc = fopen ("/tmp/dr_alias_graph_ecc", "ab");
+ if (file_ecc)
+ {
+ snprintf (comment, sizeof (comment), "%s %s", main_input_filename,
+ current_function_name ());
+ write_alias_graph_to_ascii_ecc (file_ecc, comment, drs);
+ fclose (file_ecc);
+ }
+
+ file_dot = fopen ("/tmp/dr_alias_graph_dot", "ab");
+ if (file_dot)
+ {
+ snprintf (comment, sizeof (comment), "%s %s", main_input_filename,
+ current_function_name ());
+ write_alias_graph_to_ascii_dot (file_dot, comment, drs);
+ fclose (file_dot);
+ }
+}
+
/* Build data references in SCOP. */
static void
GBB_DATA_REFS (PBB_BLACK_BOX (pbb)), j, dr); j++)
VEC_safe_push (data_reference_p, heap, drs, dr);
- build_alias_set_for_drs (drs);
+ for (i = 0; VEC_iterate (data_reference_p, drs, i, dr); i++)
+ dr->aux = XNEW (base_alias_pair);
+
+ if (!build_alias_set_optimal_p (drs))
+ {
+ /* TODO: Add support when building alias set is not optimal. */
+ ;
+ }
+
build_base_obj_set_for_drs (drs);
/* When debugging, enable the following code. This cannot be used
in production compilers. */
-#if 0
- {
- char comment[100];
- FILE *file;
-
- file = fopen ("/tmp/dr_alias_graph", "ab");
- if (file)
- {
- snprintf (comment, sizeof (comment), "%s %s", main_input_filename,
- current_function_name ());
- write_alias_graph_to_ascii_dimacs (file, comment, drs);
- fclose (file);
- }
- }
-#endif
+ if (0)
+ dump_alias_graphs (drs);
VEC_free (data_reference_p, heap, drs);
build_pbb_drs (pbb);
}
+/* Return a gsi at the position of the phi node STMT. */
+
+static gimple_stmt_iterator
+gsi_for_phi_node (gimple stmt)
+{
+ gimple_stmt_iterator psi;
+ basic_block bb = gimple_bb (stmt);
+
+ for (psi = gsi_start_phis (bb); !gsi_end_p (psi); gsi_next (&psi))
+ if (stmt == gsi_stmt (psi))
+ return psi;
+
+ gcc_unreachable ();
+ return psi;
+}
+
/* Insert the assignment "RES := VAR" just after the definition of VAR. */
static void
/* Creates a zero dimension array of the same type as VAR. */
static tree
-create_zero_dim_array (tree var)
+create_zero_dim_array (tree var, const char *base_name)
{
tree index_type = build_index_type (integer_zero_node);
tree elt_type = TREE_TYPE (var);
tree array_type = build_array_type (elt_type, index_type);
- tree base = create_tmp_var (array_type, "Red");
+ tree base = create_tmp_var (array_type, base_name);
add_referenced_var (base);
static bool
scalar_close_phi_node_p (gimple phi)
{
- gcc_assert (gimple_code (phi) == GIMPLE_PHI);
-
- if (!is_gimple_reg (gimple_phi_result (phi)))
+ if (gimple_code (phi) != GIMPLE_PHI
+ || !is_gimple_reg (gimple_phi_result (phi)))
return false;
return (gimple_phi_num_args (phi) == 1);
gimple phi = gsi_stmt (*psi);
tree res = gimple_phi_result (phi);
tree var = SSA_NAME_VAR (res);
- tree zero_dim_array = create_zero_dim_array (var);
+ tree zero_dim_array = create_zero_dim_array (var, "Close_Phi");
gimple_stmt_iterator gsi = gsi_after_labels (gimple_bb (phi));
gimple stmt = gimple_build_assign (res, zero_dim_array);
tree arg = gimple_phi_arg_def (phi, 0);
basic_block bb = gimple_bb (phi);
tree res = gimple_phi_result (phi);
tree var = SSA_NAME_VAR (res);
- tree zero_dim_array = create_zero_dim_array (var);
+ tree zero_dim_array = create_zero_dim_array (var, "General_Reduction");
gimple_stmt_iterator gsi;
gimple stmt;
gimple_seq stmts;
use_operand_p use_p;
gimple_stmt_iterator gsi;
- gimple_assign_set_lhs (name_stmt, name);
-
- if (gimple_code (use_stmt) == GIMPLE_PHI)
- {
- gimple phi = use_stmt;
- edge entry;
- unsigned i;
+ gcc_assert (gimple_code (use_stmt) != GIMPLE_PHI);
- for (i = 0; i < gimple_phi_num_args (phi); i++)
- if (operand_equal_p (def, gimple_phi_arg_def (phi, i), 0))
- {
- entry = gimple_phi_arg_edge (phi, i);
- break;
- }
+ gimple_assign_set_lhs (name_stmt, name);
- FOR_EACH_PHI_ARG (use_p, phi, iter, SSA_OP_USE)
- if (operand_equal_p (def, USE_FROM_PTR (use_p), 0))
- {
- gsi = gsi_last_bb (entry->src);
- gsi_insert_after (&gsi, name_stmt, GSI_NEW_STMT);
- SET_USE (use_p, name);
- break;
- }
- }
- else
- {
- gsi = gsi_for_stmt (use_stmt);
- gsi_insert_before (&gsi, name_stmt, GSI_NEW_STMT);
+ gsi = gsi_for_stmt (use_stmt);
+ gsi_insert_before (&gsi, name_stmt, GSI_NEW_STMT);
- FOR_EACH_SSA_USE_OPERAND (use_p, use_stmt, iter, SSA_OP_ALL_USES)
- if (operand_equal_p (def, USE_FROM_PTR (use_p), 0))
- replace_exp (use_p, name);
- }
+ FOR_EACH_SSA_USE_OPERAND (use_p, use_stmt, iter, SSA_OP_ALL_USES)
+ if (operand_equal_p (def, USE_FROM_PTR (use_p), 0))
+ replace_exp (use_p, name);
update_stmt (use_stmt);
}
def_bb = gimple_bb (stmt);
FOR_EACH_IMM_USE_STMT (use_stmt, imm_iter, def)
- if (def_bb != gimple_bb (use_stmt))
+ if (def_bb != gimple_bb (use_stmt)
+ && gimple_code (use_stmt) != GIMPLE_PHI)
{
if (!zero_dim_array)
{
- zero_dim_array = create_zero_dim_array (SSA_NAME_VAR (def));
+ zero_dim_array = create_zero_dim_array
+ (SSA_NAME_VAR (def), "Cross_BB_scalar_dependence");
insert_out_of_ssa_copy (zero_dim_array, def);
gsi_next (gsi);
}
return res;
}
+/* Return the number of data references in BB that write in
+ memory. */
+
+static int
+nb_data_writes_in_bb (basic_block bb)
+{
+ int res = 0;
+ gimple_stmt_iterator gsi;
+
+ for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
+ if (gimple_vdef (gsi_stmt (gsi)))
+ res++;
+
+ return res;
+}
+
+/* Splits STMT out of its current BB. */
+
+static basic_block
+split_reduction_stmt (gimple stmt)
+{
+ gimple_stmt_iterator gsi;
+ basic_block bb = gimple_bb (stmt);
+ edge e;
+
+ /* Do not split basic blocks with no writes to memory: the reduction
+ will be the only write to memory. */
+ if (nb_data_writes_in_bb (bb) == 0)
+ return bb;
+
+ split_block (bb, stmt);
+
+ gsi = gsi_last_bb (bb);
+ gsi_prev (&gsi);
+ e = split_block (bb, gsi_stmt (gsi));
+
+ return e->dest;
+}
+
+/* Return true when stmt is a reduction operation. */
+
+static inline bool
+is_reduction_operation_p (gimple stmt)
+{
+ return flag_associative_math
+ && commutative_tree_code (gimple_assign_rhs_code (stmt))
+ && associative_tree_code (gimple_assign_rhs_code (stmt));
+}
+
+/* Returns true when PHI contains an argument ARG. */
+
+static bool
+phi_contains_arg (gimple phi, tree arg)
+{
+ size_t i;
+
+ for (i = 0; i < gimple_phi_num_args (phi); i++)
+ if (operand_equal_p (arg, gimple_phi_arg_def (phi, i), 0))
+ return true;
+
+ return false;
+}
+
+/* Return a loop phi node that corresponds to a reduction containing LHS. */
+
+static gimple
+follow_ssa_with_commutative_ops (tree arg, tree lhs)
+{
+ gimple stmt;
+
+ if (TREE_CODE (arg) != SSA_NAME)
+ return NULL;
+
+ stmt = SSA_NAME_DEF_STMT (arg);
+
+ if (gimple_code (stmt) == GIMPLE_PHI)
+ {
+ if (phi_contains_arg (stmt, lhs))
+ return stmt;
+ return NULL;
+ }
+
+ if (gimple_num_ops (stmt) == 2)
+ return follow_ssa_with_commutative_ops (gimple_assign_rhs1 (stmt), lhs);
+
+ if (is_reduction_operation_p (stmt))
+ {
+ gimple res = follow_ssa_with_commutative_ops (gimple_assign_rhs1 (stmt), lhs);
+
+ return res ? res :
+ follow_ssa_with_commutative_ops (gimple_assign_rhs2 (stmt), lhs);
+ }
+
+ return NULL;
+}
+
+/* Detect commutative and associative scalar reductions starting at
+ the STMT. */
+
+static gimple
+detect_commutative_reduction_arg (tree lhs, gimple stmt, tree arg,
+ VEC (gimple, heap) **in,
+ VEC (gimple, heap) **out)
+{
+ gimple phi = follow_ssa_with_commutative_ops (arg, lhs);
+
+ if (phi)
+ {
+ VEC_safe_push (gimple, heap, *in, stmt);
+ VEC_safe_push (gimple, heap, *out, stmt);
+ return phi;
+ }
+
+ return NULL;
+}
+
+/* Detect commutative and associative scalar reductions starting at
+ the STMT. */
+
+static gimple
+detect_commutative_reduction_assign (gimple stmt, VEC (gimple, heap) **in,
+ VEC (gimple, heap) **out)
+{
+ tree lhs = gimple_assign_lhs (stmt);
+
+ if (gimple_num_ops (stmt) == 2)
+ return detect_commutative_reduction_arg (lhs, stmt,
+ gimple_assign_rhs1 (stmt),
+ in, out);
+
+ if (is_reduction_operation_p (stmt))
+ {
+ gimple res = detect_commutative_reduction_arg (lhs, stmt,
+ gimple_assign_rhs1 (stmt),
+ in, out);
+ return res ? res
+ : detect_commutative_reduction_arg (lhs, stmt,
+ gimple_assign_rhs2 (stmt),
+ in, out);
+ }
+
+ return NULL;
+}
+
+/* Return a loop phi node that corresponds to a reduction containing LHS. */
+
+static gimple
+follow_inital_value_to_phi (tree arg, tree lhs)
+{
+ gimple stmt;
+
+ if (!arg || TREE_CODE (arg) != SSA_NAME)
+ return NULL;
+
+ stmt = SSA_NAME_DEF_STMT (arg);
+
+ if (gimple_code (stmt) == GIMPLE_PHI
+ && phi_contains_arg (stmt, lhs))
+ return stmt;
+
+ return NULL;
+}
+
+
+/* Return the argument of the loop PHI that is the inital value coming
+ from outside the loop. */
+
+static edge
+edge_initial_value_for_loop_phi (gimple phi)
+{
+ size_t i;
+
+ for (i = 0; i < gimple_phi_num_args (phi); i++)
+ {
+ edge e = gimple_phi_arg_edge (phi, i);
+
+ if (loop_depth (e->src->loop_father)
+ < loop_depth (e->dest->loop_father))
+ return e;
+ }
+
+ return NULL;
+}
+
+/* Return the argument of the loop PHI that is the inital value coming
+ from outside the loop. */
+
+static tree
+initial_value_for_loop_phi (gimple phi)
+{
+ size_t i;
+
+ for (i = 0; i < gimple_phi_num_args (phi); i++)
+ {
+ edge e = gimple_phi_arg_edge (phi, i);
+
+ if (loop_depth (e->src->loop_father)
+ < loop_depth (e->dest->loop_father))
+ return gimple_phi_arg_def (phi, i);
+ }
+
+ return NULL_TREE;
+}
+
+/* Detect commutative and associative scalar reductions starting at
+ the loop closed phi node CLOSE_PHI. */
+
+static gimple
+detect_commutative_reduction (gimple stmt, VEC (gimple, heap) **in,
+ VEC (gimple, heap) **out)
+{
+ if (scalar_close_phi_node_p (stmt))
+ {
+ tree arg = gimple_phi_arg_def (stmt, 0);
+ gimple def = SSA_NAME_DEF_STMT (arg);
+ gimple loop_phi = detect_commutative_reduction (def, in, out);
+
+ if (loop_phi)
+ {
+ tree lhs = gimple_phi_result (stmt);
+ tree init = initial_value_for_loop_phi (loop_phi);
+ gimple phi = follow_inital_value_to_phi (init, lhs);
+
+ VEC_safe_push (gimple, heap, *in, loop_phi);
+ VEC_safe_push (gimple, heap, *out, stmt);
+ return phi;
+ }
+ else
+ return NULL;
+ }
+
+ if (gimple_code (stmt) == GIMPLE_ASSIGN)
+ return detect_commutative_reduction_assign (stmt, in, out);
+
+ return NULL;
+}
+
+/* Translate the scalar reduction statement STMT to an array RED
+ knowing that its recursive phi node is LOOP_PHI. */
+
+static void
+translate_scalar_reduction_to_array_for_stmt (tree red, gimple stmt,
+ gimple loop_phi)
+{
+ basic_block bb = gimple_bb (stmt);
+ gimple_stmt_iterator insert_gsi = gsi_after_labels (bb);
+ tree res = gimple_phi_result (loop_phi);
+ gimple assign = gimple_build_assign (res, red);
+
+ gsi_insert_before (&insert_gsi, assign, GSI_SAME_STMT);
+
+ assign = gimple_build_assign (red, gimple_assign_lhs (stmt));
+ insert_gsi = gsi_for_stmt (stmt);
+ gsi_insert_after (&insert_gsi, assign, GSI_SAME_STMT);
+}
+
+/* Insert the assignment "result (CLOSE_PHI) = RED". */
+
+static void
+insert_copyout (tree red, gimple close_phi)
+{
+ tree res = gimple_phi_result (close_phi);
+ basic_block bb = gimple_bb (close_phi);
+ gimple_stmt_iterator insert_gsi = gsi_after_labels (bb);
+ gimple assign = gimple_build_assign (res, red);
+
+ gsi_insert_before (&insert_gsi, assign, GSI_SAME_STMT);
+}
+
+/* Insert the assignment "RED = initial_value (LOOP_PHI)". */
+
+static void
+insert_copyin (tree red, gimple loop_phi)
+{
+ gimple_seq stmts;
+ tree init = initial_value_for_loop_phi (loop_phi);
+ tree expr = build2 (MODIFY_EXPR, TREE_TYPE (init), red, init);
+
+ force_gimple_operand (expr, &stmts, true, NULL);
+ gsi_insert_seq_on_edge (edge_initial_value_for_loop_phi (loop_phi), stmts);
+}
+
+/* Rewrite out of SSA the reduction described by the loop phi nodes
+ IN, and the close phi nodes OUT. IN and OUT are structured by loop
+ levels like this:
+
+ IN: stmt, loop_n, ..., loop_0
+ OUT: stmt, close_n, ..., close_0
+
+ the first element is the reduction statement, and the next elements
+ are the loop and close phi nodes of each of the outer loops. */
+
+static void
+translate_scalar_reduction_to_array (VEC (gimple, heap) *in,
+ VEC (gimple, heap) *out,
+ sbitmap reductions)
+{
+ unsigned int i;
+ gimple loop_phi;
+ tree red;
+ gimple_stmt_iterator gsi;
+
+ for (i = 0; VEC_iterate (gimple, in, i, loop_phi); i++)
+ {
+ gimple close_phi = VEC_index (gimple, out, i);
+
+ if (i == 0)
+ {
+ gimple stmt = loop_phi;
+ basic_block bb = split_reduction_stmt (stmt);
+
+ SET_BIT (reductions, bb->index);
+ gcc_assert (close_phi == loop_phi);
+
+ red = create_zero_dim_array
+ (gimple_assign_lhs (stmt), "Commutative_Associative_Reduction");
+ translate_scalar_reduction_to_array_for_stmt
+ (red, stmt, VEC_index (gimple, in, 1));
+ continue;
+ }
+
+ if (i == VEC_length (gimple, in) - 1)
+ {
+ insert_copyout (red, close_phi);
+ insert_copyin (red, loop_phi);
+ }
+
+ gsi = gsi_for_phi_node (loop_phi);
+ remove_phi_node (&gsi, false);
+
+ gsi = gsi_for_phi_node (close_phi);
+ remove_phi_node (&gsi, false);
+ }
+}
+
+/* Rewrites out of SSA a commutative reduction at CLOSE_PHI. */
+
+static void
+rewrite_commutative_reductions_out_of_ssa_close_phi (gimple close_phi,
+ sbitmap reductions)
+{
+ VEC (gimple, heap) *in = VEC_alloc (gimple, heap, 10);
+ VEC (gimple, heap) *out = VEC_alloc (gimple, heap, 10);
+
+ detect_commutative_reduction (close_phi, &in, &out);
+ if (VEC_length (gimple, in) > 0)
+ translate_scalar_reduction_to_array (in, out, reductions);
+
+ VEC_free (gimple, heap, in);
+ VEC_free (gimple, heap, out);
+}
+
+/* Rewrites all the commutative reductions from LOOP out of SSA. */
+
+static void
+rewrite_commutative_reductions_out_of_ssa_loop (loop_p loop,
+ sbitmap reductions)
+{
+ gimple_stmt_iterator gsi;
+ edge exit = single_exit (loop);
+
+ if (!exit)
+ return;
+
+ for (gsi = gsi_start_phis (exit->dest); !gsi_end_p (gsi); gsi_next (&gsi))
+ rewrite_commutative_reductions_out_of_ssa_close_phi (gsi_stmt (gsi),
+ reductions);
+}
+
+/* Rewrites all the commutative reductions from SCOP out of SSA. */
+
+static void
+rewrite_commutative_reductions_out_of_ssa (sese region, sbitmap reductions)
+{
+ loop_iterator li;
+ loop_p loop;
+
+ FOR_EACH_LOOP (li, loop, 0)
+ if (loop_in_sese_p (loop, region))
+ rewrite_commutative_reductions_out_of_ssa_loop (loop, reductions);
+
+ gsi_commit_edge_inserts ();
+ update_ssa (TODO_update_ssa);
+#ifdef ENABLE_CHECKING
+ verify_ssa (false);
+ verify_loop_closed_ssa ();
+#endif
+}
+
+/* A LOOP is in normal form for Graphite when it contains only one
+ scalar phi node that defines the main induction variable of the
+ loop, only one increment of the IV, and only one exit condition. */
+
+static void
+graphite_loop_normal_form (loop_p loop)
+{
+ struct tree_niter_desc niter;
+ tree nit;
+ gimple_seq stmts;
+ edge exit = single_dom_exit (loop);
+
+ bool known_niter = number_of_iterations_exit (loop, exit, &niter, false);
+
+ /* At this point we should know the number of iterations, */
+ gcc_assert (known_niter);
+
+ nit = force_gimple_operand (unshare_expr (niter.niter), &stmts, true,
+ NULL_TREE);
+ if (stmts)
+ gsi_insert_seq_on_edge_immediate (loop_preheader_edge (loop), stmts);
+
+ loop->single_iv = canonicalize_loop_ivs (loop, &nit);
+}
+
+/* Rewrite all the loops of SCOP in normal form: one induction
+ variable per loop. */
+
+static void
+scop_canonicalize_loops (scop_p scop)
+{
+ loop_iterator li;
+ loop_p loop;
+
+ FOR_EACH_LOOP (li, loop, 0)
+ if (loop_in_sese_p (loop, SCOP_REGION (scop)))
+ graphite_loop_normal_form (loop);
+}
+
/* Builds the polyhedral representation for a SESE region. */
bool
build_poly_scop (scop_p scop)
{
sese region = SCOP_REGION (scop);
+ sbitmap reductions = sbitmap_alloc (last_basic_block * 2);
+
+ sbitmap_zero (reductions);
+ rewrite_commutative_reductions_out_of_ssa (region, reductions);
rewrite_reductions_out_of_ssa (scop);
- build_scop_bbs (scop);
+ build_scop_bbs (scop, reductions);
+ sbitmap_free (reductions);
/* FIXME: This restriction is needed to avoid a problem in CLooG.
Once CLooG is fixed, remove this guard. Anyways, it makes no
if (nb_pbbs_in_loops (scop) == 0)
return false;
+ scop_canonicalize_loops (scop);
build_sese_loop_nests (region);
build_sese_conditions (region);
find_scop_parameters (scop);
build_scop_context (scop);
add_conditions_to_constraints (scop);
+ scop_to_lst (scop);
build_scop_scattering (scop);
build_scop_drs (scop);