| 0 0 1 0 0 0 0 0 -5 = 0 */
static void
-build_pbb_scattering_polyhedrons (isl_aff *static_sched,
- poly_bb_p pbb)
+build_pbb_minimal_scattering_polyhedrons (isl_aff *static_sched, poly_bb_p pbb,
+ int *sequence_dims,
+ int nb_sequence_dim)
{
- isl_val *val;
+ int local_dim = isl_set_dim (pbb->domain, isl_dim_set);
+
+ /* Remove a sequence dimension if irrelevant to domain of current pbb. */
+ int actual_nb_dim = 0;
+ for (int i = 0; i < nb_sequence_dim; i++)
+ if (sequence_dims[i] <= local_dim)
+ actual_nb_dim++;
+
+ /* Build an array that combines sequence dimensions and loops dimensions info.
+ This is used later to compute the static scattering polyhedrons. */
+ bool *sequence_and_loop_dims = NULL;
+ if (local_dim + actual_nb_dim > 0)
+ {
+ sequence_and_loop_dims = XNEWVEC (bool, local_dim + actual_nb_dim);
- int scattering_dimensions = isl_set_dim (pbb->domain, isl_dim_set) * 2 + 1;
+ int i = 0, j = 0;
+ for (; i < local_dim; i++)
+ {
+ if (sequence_dims && sequence_dims[j] == i)
+ {
+ /* True for sequence dimension. */
+ sequence_and_loop_dims[i + j] = true;
+ j++;
+ }
+ /* False for loop dimension. */
+ sequence_and_loop_dims[i + j] = false;
+ }
+ /* Fake loops make things shifted by one. */
+ if (sequence_dims && sequence_dims[j] == i)
+ sequence_and_loop_dims[i + j] = true;
+ }
+ int scattering_dimensions = local_dim + actual_nb_dim;
isl_space *dc = isl_set_get_space (pbb->domain);
- isl_space *dm = isl_space_add_dims (isl_space_from_domain (dc),
- isl_dim_out, scattering_dimensions);
+ isl_space *dm = isl_space_add_dims (isl_space_from_domain (dc), isl_dim_out,
+ scattering_dimensions);
pbb->schedule = isl_map_universe (dm);
+ int k = 0;
for (int i = 0; i < scattering_dimensions; i++)
{
- /* Textual order inside this loop. */
- if ((i % 2) == 0)
+ if (!sequence_and_loop_dims[i])
{
- isl_constraint *c = isl_equality_alloc
- (isl_local_space_from_space (isl_map_get_space (pbb->schedule)));
-
- val = isl_aff_get_coefficient_val (static_sched, isl_dim_in, i / 2);
- gcc_assert (val && isl_val_is_int (val));
-
- val = isl_val_neg (val);
- c = isl_constraint_set_constant_val (c, val);
- c = isl_constraint_set_coefficient_si (c, isl_dim_out, i, 1);
- pbb->schedule = isl_map_add_constraint (pbb->schedule, c);
- }
-
- /* Iterations of this loop. */
- else /* if ((i % 2) == 1) */
- {
- int loop = (i - 1) / 2;
- pbb->schedule = isl_map_equate (pbb->schedule, isl_dim_in, loop,
+ /* Iterations of this loop - loop dimension. */
+ pbb->schedule = isl_map_equate (pbb->schedule, isl_dim_in, k,
isl_dim_out, i);
+ k++;
+ continue;
}
+
+ /* Textual order inside this loop - sequence dimension. */
+ isl_space *s = isl_map_get_space (pbb->schedule);
+ isl_local_space *ls = isl_local_space_from_space (s);
+ isl_constraint *c = isl_equality_alloc (ls);
+ isl_val *val = isl_aff_get_coefficient_val (static_sched, isl_dim_in, k);
+ gcc_assert (val && isl_val_is_int (val));
+ val = isl_val_neg (val);
+ c = isl_constraint_set_constant_val (c, val);
+ c = isl_constraint_set_coefficient_si (c, isl_dim_out, i, 1);
+ pbb->schedule = isl_map_add_constraint (pbb->schedule, c);
}
+ XDELETEVEC (sequence_and_loop_dims);
pbb->transformed = isl_map_copy (pbb->schedule);
}
-/* Build for BB the static schedule.
-
- The static schedule is a Dewey numbering of the abstract syntax
- tree: http://en.wikipedia.org/wiki/Dewey_Decimal_Classification
+/* Build the static schedule for BB. This function minimizes the number of
+ dimensions used for pbb sequences.
The following example informally defines the static schedule:
for (i: ...)
{
for (j: ...)
- {
- B
- C
- }
-
+ {
+ B
+ C
+ }
+ }
+ for (i: ...)
+ {
for (k: ...)
- {
- D
- E
- }
+ {
+ D
+ E
+ }
}
F
Static schedules for A to F:
- DEPTH
- 0 1 2
- A 0
- B 1 0 0
- C 1 0 1
- D 1 1 0
- E 1 1 1
- F 2
+ A (0)
+ B (1 i0 i1 0)
+ C (1 i0 i1 1)
+ D (2 i0 i1 2)
+ E (2 i0 i1 3)
+ F (3)
*/
static void
-build_scop_scattering (scop_p scop)
+build_scop_minimal_scattering (scop_p scop)
{
gimple_poly_bb_p previous_gbb = NULL;
- isl_space *dc = isl_set_get_space (scop->param_context);
- isl_aff *static_sched;
+ int *temp_for_sequence_dims = NULL;
+ int i;
+ poly_bb_p pbb;
+
+ /* Go through the pbbs to determine the minimum number of dimensions needed to
+ build the static schedule. */
+ int nb_dims = 0;
+ FOR_EACH_VEC_ELT (scop->pbbs, i, pbb)
+ {
+ int dim = isl_set_dim (pbb->domain, isl_dim_set);
+ if (dim > nb_dims)
+ nb_dims = dim;
+ }
+
+ /* One extra dimension for the outer fake loop. */
+ nb_dims++;
+ temp_for_sequence_dims = XCNEWVEC (int, nb_dims);
+ /* Record the number of common loops for each dimension. */
+ FOR_EACH_VEC_ELT (scop->pbbs, i, pbb)
+ {
+ gimple_poly_bb_p gbb = PBB_BLACK_BOX (pbb);
+ int prefix = 0;
+
+ if (previous_gbb)
+ {
+ prefix = nb_common_loops (scop->scop_info->region, previous_gbb, gbb);
+ temp_for_sequence_dims[prefix] += 1;
+ }
+ previous_gbb = gbb;
+ }
+
+ /* Analyze the info in temp_for_sequence_dim and determine the minimal number
+ of sequence dimensions. A dimension that did not appear as common
+ dimension should not be considered as a sequence dimension. */
+ int nb_sequence_params = 0;
+ for (i = 0; i < nb_dims; i++)
+ if (temp_for_sequence_dims[i] > 0)
+ nb_sequence_params++;
+
+ int *sequence_dims = NULL;
+ if (nb_sequence_params > 0)
+ {
+ int j = 0;
+ sequence_dims = XNEWVEC (int, nb_sequence_params);
+ for (i = 0; i < nb_dims; i++)
+ if (temp_for_sequence_dims[i] > 0)
+ {
+ sequence_dims[j] = i;
+ j++;
+ }
+ }
+
+ XDELETEVEC (temp_for_sequence_dims);
+
+ isl_space *dc = isl_set_get_space (scop->param_context);
dc = isl_space_add_dims (dc, isl_dim_set, number_of_loops (cfun));
- static_sched = isl_aff_zero_on_domain (isl_local_space_from_space (dc));
+ isl_local_space *local_space = isl_local_space_from_space (dc);
+ isl_aff *static_sched = isl_aff_zero_on_domain (local_space);
/* We have to start schedules at 0 on the first component and
because we cannot compare_prefix_loops against a previous loop,
incremented before copying. */
static_sched = isl_aff_add_coefficient_si (static_sched, isl_dim_in, 0, -1);
- int i;
- poly_bb_p pbb;
+ previous_gbb = NULL;
FOR_EACH_VEC_ELT (scop->pbbs, i, pbb)
{
gimple_poly_bb_p gbb = PBB_BLACK_BOX (pbb);
static_sched = isl_aff_add_coefficient_si (static_sched, isl_dim_in,
prefix, 1);
- build_pbb_scattering_polyhedrons (static_sched, pbb);
+ build_pbb_minimal_scattering_polyhedrons (static_sched, pbb,
+ sequence_dims, nb_sequence_params);
}
+ XDELETEVEC (sequence_dims);
isl_aff_free (static_sched);
}
rewrite_cross_bb_scalar_deps_out_of_ssa (scop);
build_scop_drs (scop);
- build_scop_scattering (scop);
+ build_scop_minimal_scattering (scop);
/* This SCoP has been translated to the polyhedral
representation. */
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