/* Conversion of SESE regions to Polyhedra.
- Copyright (C) 2009-2015 Free Software Foundation, Inc.
+ Copyright (C) 2009-2017 Free Software Foundation, Inc.
Contributed by Sebastian Pop <sebastian.pop@amd.com>.
This file is part of GCC.
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
+#define USES_ISL
+
#include "config.h"
#ifdef HAVE_isl
-/* Workaround for GMP 5.1.3 bug, see PR56019. */
-#include <stddef.h>
-
-#include <isl/constraint.h>
-#include <isl/set.h>
-#include <isl/map.h>
-#include <isl/union_map.h>
-#include <isl/constraint.h>
-#include <isl/aff.h>
-#include <isl/val.h>
-
-/* Since ISL-0.13, the extern is in val_gmp.h. */
-#if !defined(HAVE_ISL_SCHED_CONSTRAINTS_COMPUTE_SCHEDULE) && defined(__cplusplus)
-extern "C" {
-#endif
-#include <isl/val_gmp.h>
-#if !defined(HAVE_ISL_SCHED_CONSTRAINTS_COMPUTE_SCHEDULE) && defined(__cplusplus)
-}
-#endif
#include "system.h"
#include "coretypes.h"
#include "tree-data-ref.h"
#include "tree-scalar-evolution.h"
#include "domwalk.h"
-#include "graphite-poly.h"
#include "tree-ssa-propagate.h"
-#include "graphite-sese-to-poly.h"
+#include <isl/constraint.h>
+#include <isl/set.h>
+#include <isl/map.h>
+#include <isl/union_map.h>
+#include <isl/constraint.h>
+#include <isl/aff.h>
+#include <isl/val.h>
+#include <isl/val_gmp.h>
-static const unsigned ssa_name_version_typesize = sizeof(unsigned);
+#include "graphite.h"
/* Assigns to RES the value of the INTEGER_CST T. */
wi::to_mpz (t, res, TYPE_SIGN (TREE_TYPE (t)));
}
-/* Returns the index of the PHI argument defined in the outermost
- loop. */
-
-static size_t
-phi_arg_in_outermost_loop (gphi *phi)
-{
- loop_p loop = gimple_bb (phi)->loop_father;
- size_t i, res = 0;
-
- for (i = 0; i < gimple_phi_num_args (phi); i++)
- if (!flow_bb_inside_loop_p (loop, gimple_phi_arg_edge (phi, i)->src))
- {
- loop = gimple_phi_arg_edge (phi, i)->src->loop_father;
- res = i;
- }
-
- return res;
-}
-
-/* Removes a simple copy phi node "RES = phi (INIT, RES)" at position
- PSI by inserting on the loop ENTRY edge assignment "RES = INIT". */
-
-static void
-remove_simple_copy_phi (gphi_iterator *psi)
-{
- gphi *phi = psi->phi ();
- tree res = gimple_phi_result (phi);
- size_t entry = phi_arg_in_outermost_loop (phi);
- tree init = gimple_phi_arg_def (phi, entry);
- gassign *stmt = gimple_build_assign (res, init);
- edge e = gimple_phi_arg_edge (phi, entry);
-
- remove_phi_node (psi, false);
- gsi_insert_on_edge_immediate (e, stmt);
-}
-
-/* Removes an invariant phi node at position PSI by inserting on the
- loop ENTRY edge the assignment RES = INIT. */
-
-static void
-remove_invariant_phi (sese region, gphi_iterator *psi)
-{
- gphi *phi = psi->phi ();
- loop_p loop = loop_containing_stmt (phi);
- tree res = gimple_phi_result (phi);
- tree scev = scalar_evolution_in_region (region, loop, res);
- size_t entry = phi_arg_in_outermost_loop (phi);
- edge e = gimple_phi_arg_edge (phi, entry);
- tree var;
- gassign *stmt;
- gimple_seq stmts = NULL;
-
- if (tree_contains_chrecs (scev, NULL))
- scev = gimple_phi_arg_def (phi, entry);
-
- var = force_gimple_operand (scev, &stmts, true, NULL_TREE);
- stmt = gimple_build_assign (res, var);
- remove_phi_node (psi, false);
-
- gimple_seq_add_stmt (&stmts, stmt);
- gsi_insert_seq_on_edge (e, stmts);
- gsi_commit_edge_inserts ();
- SSA_NAME_DEF_STMT (res) = stmt;
-}
-
-/* Returns true when the phi node at PSI is of the form "a = phi (a, x)". */
-
-static inline bool
-simple_copy_phi_p (gphi *phi)
-{
- if (gimple_phi_num_args (phi) != 2)
- return false;
-
- tree res = gimple_phi_result (phi);
- return (res == gimple_phi_arg_def (phi, 0)
- || res == gimple_phi_arg_def (phi, 1));
-}
-
-/* Returns true when the phi node at position PSI is a reduction phi
- node in REGION. Otherwise moves the pointer PSI to the next phi to
- be considered. */
-
-static bool
-reduction_phi_p (sese region, gphi_iterator *psi)
-{
- loop_p loop;
- gphi *phi = psi->phi ();
- tree res = gimple_phi_result (phi);
-
- loop = loop_containing_stmt (phi);
-
- if (simple_copy_phi_p (phi))
- {
- /* PRE introduces phi nodes like these, for an example,
- see id-5.f in the fortran graphite testsuite:
-
- # prephitmp.85_265 = PHI <prephitmp.85_258(33), prephitmp.85_265(18)>
- */
- remove_simple_copy_phi (psi);
- return false;
- }
-
- if (scev_analyzable_p (res, region))
- {
- tree scev = scalar_evolution_in_region (region, loop, res);
-
- if (evolution_function_is_invariant_p (scev, loop->num))
- remove_invariant_phi (region, psi);
- else
- gsi_next (psi);
-
- return false;
- }
-
- /* All the other cases are considered reductions. */
- return true;
-}
-
-/* Return an ISL identifier for the polyhedral basic block PBB. */
+/* Return an isl identifier for the polyhedral basic block PBB. */
static isl_id *
isl_id_for_pbb (scop_p s, poly_bb_p pbb)
{
- char name[ssa_name_version_typesize];
+ char name[14];
snprintf (name, sizeof (name), "S_%d", pbb_index (pbb));
return isl_id_alloc (s->isl_context, name, pbb);
}
-/* Converts the STATIC_SCHEDULE of PBB into a scattering polyhedron.
- We generate SCATTERING_DIMENSIONS scattering dimensions.
-
- The scattering polyhedron consists of these dimensions: scattering,
- loop_iterators, parameters.
-
- Example:
-
- | scattering_dimensions = 5
- | nb_iterators = 1
- | scop_nb_params = 2
- |
- | Schedule:
- | i
- | 4 5
- |
- | Scattering polyhedron:
- |
- | scattering: {s1, s2, s3, s4, s5}
- | loop_iterators: {i}
- | parameters: {p1, p2}
- |
- | s1 s2 s3 s4 s5 i p1 p2 1
- | 1 0 0 0 0 0 0 0 -4 = 0
- | 0 1 0 0 0 -1 0 0 0 = 0
- | 0 0 1 0 0 0 0 0 -5 = 0 */
-
-static void
-build_pbb_scattering_polyhedrons (isl_aff *static_sched,
- poly_bb_p pbb)
-{
- isl_val *val;
-
- int scattering_dimensions = isl_set_dim (pbb->domain, isl_dim_set) * 2 + 1;
-
- 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);
- pbb->schedule = isl_map_universe (dm);
-
- for (int i = 0; i < scattering_dimensions; i++)
- {
- /* Textual order inside this loop. */
- if ((i % 2) == 0)
- {
- 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,
- isl_dim_out, i);
- }
- }
-
- 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
-
- The following example informally defines the static schedule:
-
- A
- for (i: ...)
- {
- for (j: ...)
- {
- B
- C
- }
-
- for (k: ...)
- {
- 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
-*/
-
-static void
-build_scop_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;
-
- 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));
-
- /* We have to start schedules at 0 on the first component and
- because we cannot compare_prefix_loops against a previous loop,
- prefix will be equal to zero, and that index will be
- incremented before copying. */
- static_sched = isl_aff_add_coefficient_si (static_sched, isl_dim_in, 0, -1);
-
- int i;
- poly_bb_p pbb;
- FOR_EACH_VEC_ELT (SCOP_BBS (scop), i, pbb)
- {
- gimple_poly_bb_p gbb = PBB_BLACK_BOX (pbb);
- int prefix = 0;
-
- if (previous_gbb)
- prefix = nb_common_loops (SCOP_REGION (scop), previous_gbb, gbb);
-
- previous_gbb = gbb;
-
- static_sched = isl_aff_add_coefficient_si (static_sched, isl_dim_in,
- prefix, 1);
- build_pbb_scattering_polyhedrons (static_sched, pbb);
- }
-
- isl_aff_free (static_sched);
-}
-
static isl_pw_aff *extract_affine (scop_p, tree, __isl_take isl_space *space);
/* Extract an affine expression from the chain of recurrence E. */
isl_pw_aff *lhs = extract_affine (s, CHREC_LEFT (e), isl_space_copy (space));
isl_pw_aff *rhs = extract_affine (s, CHREC_RIGHT (e), isl_space_copy (space));
isl_local_space *ls = isl_local_space_from_space (space);
- unsigned pos = sese_loop_depth (SCOP_REGION (s), get_chrec_loop (e)) - 1;
+ unsigned pos = sese_loop_depth (s->scop_info->region, get_chrec_loop (e)) - 1;
isl_aff *loop = isl_aff_set_coefficient_si
(isl_aff_zero_on_domain (ls), isl_dim_in, pos, 1);
isl_pw_aff *l = isl_pw_aff_from_aff (loop);
return isl_pw_aff_mul (lhs, rhs);
}
-/* Return an ISL identifier from the name of the ssa_name E. */
+/* Return an isl identifier from the name of the ssa_name E. */
static isl_id *
isl_id_for_ssa_name (scop_p s, tree e)
{
- const char *name = get_name (e);
- isl_id *id;
-
- if (name)
- id = isl_id_alloc (s->isl_context, name, e);
- else
- {
- char name1[ssa_name_version_typesize];
- snprintf (name1, sizeof (name1), "P_%d", SSA_NAME_VERSION (e));
- id = isl_id_alloc (s->isl_context, name1, e);
- }
-
- return id;
+ char name1[14];
+ snprintf (name1, sizeof (name1), "P_%d", SSA_NAME_VERSION (e));
+ return isl_id_alloc (s->isl_context, name1, e);
}
-/* Return an ISL identifier for the data reference DR. */
+/* Return an isl identifier for the data reference DR. Data references and
+ scalar references get the same isl_id. They need to be comparable and are
+ distinguished through the first dimension, which contains the alias set or
+ SSA_NAME_VERSION number. */
static isl_id *
-isl_id_for_dr (scop_p s, data_reference_p dr ATTRIBUTE_UNUSED)
+isl_id_for_dr (scop_p s)
{
- /* Data references all get the same isl_id. They need to be comparable
- and are distinguished through the first dimension, which contains the
- alias set number. */
return isl_id_alloc (s->isl_context, "", 0);
}
Otherwise returns -1. */
static inline int
-parameter_index_in_region_1 (tree name, sese region)
+parameter_index_in_region_1 (tree name, sese_info_p region)
{
int i;
tree p;
gcc_assert (TREE_CODE (name) == SSA_NAME);
- FOR_EACH_VEC_ELT (SESE_PARAMS (region), i, p)
+ FOR_EACH_VEC_ELT (region->params, i, p)
if (p == name)
return i;
break;
case SSA_NAME:
- gcc_assert (-1 != parameter_index_in_region_1 (e, s->region)
- || !invariant_in_sese_p_rec (e, s->region));
+ gcc_assert (-1 != parameter_index_in_region_1 (e, s->scop_info)
+ || defined_in_sese_p (e, s->scop_info->region));
res = extract_affine_name (s, e, space);
break;
return res;
}
-/* Assign dimension for each parameter in SCOP. */
-
-static void
-set_scop_parameter_dim (scop_p scop)
-{
- sese region = SCOP_REGION (scop);
- unsigned nbp = sese_nb_params (region);
- isl_space *space = isl_space_set_alloc (scop->isl_context, nbp, 0);
-
- unsigned i;
- tree e;
- FOR_EACH_VEC_ELT (SESE_PARAMS (region), i, e)
- space = isl_space_set_dim_id (space, isl_dim_param, i,
- isl_id_for_ssa_name (scop, e));
-
- scop->param_context = isl_set_universe (space);
-}
-
-/* Builds the constraint polyhedra for LOOP in SCOP. OUTER_PH gives
- the constraints for the surrounding loops. */
-
-static void
-build_loop_iteration_domains (scop_p scop, struct loop *loop,
- int nb,
- isl_set *outer, isl_set **doms)
-{
-
- tree nb_iters = number_of_latch_executions (loop);
- sese region = SCOP_REGION (scop);
- gcc_assert (loop_in_sese_p (loop, region));
-
- isl_set *inner = isl_set_copy (outer);
- int pos = isl_set_dim (outer, isl_dim_set);
- isl_val *v;
- mpz_t g;
-
- mpz_init (g);
-
- inner = isl_set_add_dims (inner, isl_dim_set, 1);
- isl_space *space = isl_set_get_space (inner);
-
- /* 0 <= loop_i */
- isl_constraint *c = isl_inequality_alloc
- (isl_local_space_from_space (isl_space_copy (space)));
- c = isl_constraint_set_coefficient_si (c, isl_dim_set, pos, 1);
- inner = isl_set_add_constraint (inner, c);
-
- /* loop_i <= cst_nb_iters */
- if (TREE_CODE (nb_iters) == INTEGER_CST)
- {
- c = isl_inequality_alloc
- (isl_local_space_from_space (isl_space_copy (space)));
- c = isl_constraint_set_coefficient_si (c, isl_dim_set, pos, -1);
- tree_int_to_gmp (nb_iters, g);
- v = isl_val_int_from_gmp (scop->isl_context, g);
- c = isl_constraint_set_constant_val (c, v);
- inner = isl_set_add_constraint (inner, c);
- }
-
- /* loop_i <= expr_nb_iters */
- else if (!chrec_contains_undetermined (nb_iters))
- {
- isl_pw_aff *aff;
-
- nb_iters = scalar_evolution_in_region (region, loop, nb_iters);
-
- aff = extract_affine (scop, nb_iters, isl_set_get_space (inner));
- isl_set *valid = isl_pw_aff_nonneg_set (isl_pw_aff_copy (aff));
- valid = isl_set_project_out (valid, isl_dim_set, 0,
- isl_set_dim (valid, isl_dim_set));
- scop->param_context = isl_set_intersect (scop->param_context, valid);
-
- isl_local_space *ls = isl_local_space_from_space (isl_space_copy (space));
- isl_aff *al = isl_aff_set_coefficient_si (isl_aff_zero_on_domain (ls),
- isl_dim_in, pos, 1);
- isl_set *le = isl_pw_aff_le_set (isl_pw_aff_from_aff (al),
- isl_pw_aff_copy (aff));
- inner = isl_set_intersect (inner, le);
-
- widest_int nit;
- if (max_stmt_executions (loop, &nit))
- {
- /* Insert in the context the constraints from the
- estimation of the number of iterations NIT and the
- symbolic number of iterations (involving parameter
- names) NB_ITERS. First, build the affine expression
- "NIT - NB_ITERS" and then say that it is positive,
- i.e., NIT approximates NB_ITERS: "NIT >= NB_ITERS". */
- mpz_t g;
- mpz_init (g);
- wi::to_mpz (nit, g, SIGNED);
- mpz_sub_ui (g, g, 1);
-
- isl_pw_aff *approx
- = extract_affine_gmp (g, isl_set_get_space (inner));
- isl_set *x = isl_pw_aff_ge_set (approx, aff);
- x = isl_set_project_out (x, isl_dim_set, 0,
- isl_set_dim (x, isl_dim_set));
- scop->param_context = isl_set_intersect (scop->param_context, x);
-
- isl_constraint *c = isl_inequality_alloc
- (isl_local_space_from_space (isl_space_copy (space)));
- c = isl_constraint_set_coefficient_si (c, isl_dim_set, pos, -1);
- v = isl_val_int_from_gmp (scop->isl_context, g);
- mpz_clear (g);
- c = isl_constraint_set_constant_val (c, v);
- inner = isl_set_add_constraint (inner, c);
- }
- else
- isl_pw_aff_free (aff);
- }
- else
- gcc_unreachable ();
-
- if (loop->inner)
- build_loop_iteration_domains (scop, loop->inner, nb + 1,
- isl_set_copy (inner), doms);
-
- if (nb != 0
- && loop->next
- && loop_in_sese_p (loop->next, region))
- build_loop_iteration_domains (scop, loop->next, nb,
- isl_set_copy (outer), doms);
-
- doms[loop->num] = inner;
-
- isl_set_free (outer);
- isl_space_free (space);
- mpz_clear (g);
-}
-
/* Returns a linear expression for tree T evaluated in PBB. */
static isl_pw_aff *
-create_pw_aff_from_tree (poly_bb_p pbb, tree t)
+create_pw_aff_from_tree (poly_bb_p pbb, loop_p loop, tree t)
{
scop_p scop = PBB_SCOP (pbb);
- t = scalar_evolution_in_region (SCOP_REGION (scop), pbb_loop (pbb), t);
+ t = scalar_evolution_in_region (scop->scop_info->region, loop, t);
+
+ gcc_assert (!chrec_contains_undetermined (t));
gcc_assert (!automatically_generated_chrec_p (t));
return extract_affine (scop, t, isl_set_get_space (pbb->domain));
static void
add_condition_to_pbb (poly_bb_p pbb, gcond *stmt, enum tree_code code)
{
- isl_pw_aff *lhs = create_pw_aff_from_tree (pbb, gimple_cond_lhs (stmt));
- isl_pw_aff *rhs = create_pw_aff_from_tree (pbb, gimple_cond_rhs (stmt));
- isl_set *cond;
+ loop_p loop = gimple_bb (stmt)->loop_father;
+ isl_pw_aff *lhs = create_pw_aff_from_tree (pbb, loop, gimple_cond_lhs (stmt));
+ isl_pw_aff *rhs = create_pw_aff_from_tree (pbb, loop, gimple_cond_rhs (stmt));
+ isl_set *cond;
switch (code)
{
case LT_EXPR:
break;
default:
- isl_pw_aff_free (lhs);
- isl_pw_aff_free (rhs);
- return;
+ gcc_unreachable ();
}
cond = isl_set_coalesce (cond);
cond = isl_set_set_tuple_id (cond, isl_set_get_tuple_id (pbb->domain));
- pbb->domain = isl_set_intersect (pbb->domain, cond);
+ pbb->domain = isl_set_coalesce (isl_set_intersect (pbb->domain, cond));
}
/* Add conditions to the domain of PBB. */
break;
}
- case GIMPLE_SWITCH:
- /* Switch statements are not supported right now - fall through. */
-
default:
gcc_unreachable ();
break;
}
}
-/* Traverses all the GBBs of the SCOP and add their constraints to the
- iteration domains. */
-
-static void
-add_conditions_to_constraints (scop_p scop)
-{
- int i;
- poly_bb_p pbb;
-
- FOR_EACH_VEC_ELT (SCOP_BBS (scop), i, pbb)
- add_conditions_to_domain (pbb);
-}
-
/* Add constraints on the possible values of parameter P from the type
of P. */
static void
add_param_constraints (scop_p scop, graphite_dim_t p)
{
- tree parameter = SESE_PARAMS (SCOP_REGION (scop))[p];
+ tree parameter = scop->scop_info->params[p];
tree type = TREE_TYPE (parameter);
tree lb = NULL_TREE;
tree ub = NULL_TREE;
c = isl_constraint_set_constant_val (c, v);
c = isl_constraint_set_coefficient_si (c, isl_dim_param, p, 1);
- scop->param_context = isl_set_add_constraint (scop->param_context, c);
+ scop->param_context = isl_set_coalesce
+ (isl_set_add_constraint (scop->param_context, c));
}
if (ub)
c = isl_constraint_set_constant_val (c, v);
c = isl_constraint_set_coefficient_si (c, isl_dim_param, p, -1);
- scop->param_context = isl_set_add_constraint (scop->param_context, c);
+ scop->param_context = isl_set_coalesce
+ (isl_set_add_constraint (scop->param_context, c));
}
}
-/* Build the context of the SCOP. The context usually contains extra
- constraints that are added to the iteration domains that constrain
- some parameters. */
-
-static void
-build_scop_context (scop_p scop)
-{
- graphite_dim_t p, n = scop_nb_params (scop);
-
- for (p = 0; p < n; p++)
- add_param_constraints (scop, p);
-}
-
-/* Build the iteration domains: the loops belonging to the current
- SCOP, and that vary for the execution of the current basic block.
- Returns false if there is no loop in SCOP. */
+/* Add a constrain to the ACCESSES polyhedron for the alias set of
+ data reference DR. ACCESSP_NB_DIMS is the dimension of the
+ ACCESSES polyhedron, DOM_NB_DIMS is the dimension of the iteration
+ domain. */
-static void
-build_scop_iteration_domain (scop_p scop)
+static isl_map *
+pdr_add_alias_set (isl_map *acc, dr_info &dri)
{
- sese region = SCOP_REGION (scop);
- int nb_loops = number_of_loops (cfun);
- isl_set **doms = XCNEWVEC (isl_set *, nb_loops);
-
- int i;
- struct loop *loop;
- FOR_EACH_VEC_ELT (SESE_LOOP_NEST (region), i, loop)
- if (!loop_in_sese_p (loop_outer (loop), region))
- build_loop_iteration_domains (scop, loop, 0,
- isl_set_copy (scop->param_context), doms);
-
- poly_bb_p pbb;
- FOR_EACH_VEC_ELT (SCOP_BBS (scop), i, pbb)
- {
- loop = pbb_loop (pbb);
-
- if (doms[loop->num])
- pbb->domain = isl_set_copy (doms[loop->num]);
- else
- pbb->domain = isl_set_copy (scop->param_context);
-
- pbb->domain = isl_set_set_tuple_id (pbb->domain,
- isl_id_for_pbb (scop, pbb));
- }
-
- for (int i = 0; i < nb_loops; i++)
- if (doms[i])
- isl_set_free (doms[i]);
+ isl_constraint *c = isl_equality_alloc
+ (isl_local_space_from_space (isl_map_get_space (acc)));
+ /* Positive numbers for all alias sets. */
+ c = isl_constraint_set_constant_si (c, -dri.alias_set);
+ c = isl_constraint_set_coefficient_si (c, isl_dim_out, 0, 1);
- free (doms);
+ return isl_map_add_constraint (acc, c);
}
/* Add a constrain to the ACCESSES polyhedron for the alias set of
domain. */
static isl_map *
-pdr_add_alias_set (isl_map *acc, dr_info &dri)
+add_scalar_version_numbers (isl_map *acc, tree var)
{
isl_constraint *c = isl_equality_alloc
(isl_local_space_from_space (isl_map_get_space (acc)));
- c = isl_constraint_set_constant_si (c, -dri.alias_set);
+ int max_arrays = PARAM_VALUE (PARAM_GRAPHITE_MAX_ARRAYS_PER_SCOP);
+ /* Each scalar variables has a unique alias set number starting from
+ max_arrays. */
+ c = isl_constraint_set_constant_si (c, -max_arrays - SSA_NAME_VERSION (var));
c = isl_constraint_set_coefficient_si (c, isl_dim_out, 0, 1);
return isl_map_add_constraint (acc, c);
for (i = 0; i < nb_subscripts; i++)
{
isl_pw_aff *aff;
- tree afn = DR_ACCESS_FN (dr, nb_subscripts - 1 - i);
+ tree afn = DR_ACCESS_FN (dr, i);
aff = extract_affine (scop, afn,
isl_space_domain (isl_map_get_space (acc)));
- acc = set_index (acc, i + 1, aff);
+ acc = set_index (acc, nb_subscripts - i , aff);
}
- return acc;
+ return isl_map_coalesce (acc);
+}
+
+/* Return true when the LOW and HIGH bounds of an array reference REF are valid
+ to extract constraints on accessed elements of the array. Returning false is
+ the conservative answer. */
+
+static bool
+bounds_are_valid (tree ref, tree low, tree high)
+{
+ if (!high)
+ return false;
+
+ if (!tree_fits_shwi_p (low)
+ || !tree_fits_shwi_p (high))
+ return false;
+
+ /* 1-element arrays at end of structures may extend over
+ their declared size. */
+ if (array_at_struct_end_p (ref)
+ && operand_equal_p (low, high, 0))
+ return false;
+
+ /* Fortran has some arrays where high bound is -1 and low is 0. */
+ if (integer_onep (fold_build2 (LT_EXPR, boolean_type_node, high, low)))
+ return false;
+
+ return true;
}
/* Add constrains representing the size of the accessed data to the
tree low = array_ref_low_bound (ref);
tree high = array_ref_up_bound (ref);
- /* XXX The PPL code dealt separately with
- subscript - low >= 0 and high - subscript >= 0 in case one of
- the two bounds isn't known. Do the same here? */
-
- if (tree_fits_shwi_p (low)
- && high
- && tree_fits_shwi_p (high)
- /* 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)))
- {
- isl_id *id;
- isl_aff *aff;
- isl_set *univ, *lbs, *ubs;
- isl_pw_aff *index;
- isl_set *valid;
- isl_space *space = isl_set_get_space (subscript_sizes);
- isl_pw_aff *lb = extract_affine_int (low, isl_space_copy (space));
- isl_pw_aff *ub = extract_affine_int (high, isl_space_copy (space));
-
- /* high >= 0 */
- valid = isl_pw_aff_nonneg_set (isl_pw_aff_copy (ub));
- valid = isl_set_project_out (valid, isl_dim_set, 0,
- isl_set_dim (valid, isl_dim_set));
- scop->param_context = isl_set_intersect (scop->param_context, valid);
-
- aff = isl_aff_zero_on_domain (isl_local_space_from_space (space));
- aff = isl_aff_add_coefficient_si (aff, isl_dim_in, i + 1, 1);
- univ = isl_set_universe (isl_space_domain (isl_aff_get_space (aff)));
- index = isl_pw_aff_alloc (univ, aff);
-
- id = isl_set_get_tuple_id (subscript_sizes);
- lb = isl_pw_aff_set_tuple_id (lb, isl_dim_in, isl_id_copy (id));
- ub = isl_pw_aff_set_tuple_id (ub, isl_dim_in, id);
-
- /* low <= sub_i <= high */
- lbs = isl_pw_aff_ge_set (isl_pw_aff_copy (index), lb);
- ubs = isl_pw_aff_le_set (index, ub);
- subscript_sizes = isl_set_intersect (subscript_sizes, lbs);
- subscript_sizes = isl_set_intersect (subscript_sizes, ubs);
- }
+ if (!bounds_are_valid (ref, low, high))
+ continue;
+
+ isl_space *space = isl_set_get_space (subscript_sizes);
+ isl_pw_aff *lb = extract_affine_int (low, isl_space_copy (space));
+ isl_pw_aff *ub = extract_affine_int (high, isl_space_copy (space));
+
+ /* high >= 0 */
+ isl_set *valid = isl_pw_aff_nonneg_set (isl_pw_aff_copy (ub));
+ valid = isl_set_project_out (valid, isl_dim_set, 0,
+ isl_set_dim (valid, isl_dim_set));
+ scop->param_context = isl_set_coalesce
+ (isl_set_intersect (scop->param_context, valid));
+
+ isl_aff *aff
+ = isl_aff_zero_on_domain (isl_local_space_from_space (space));
+ aff = isl_aff_add_coefficient_si (aff, isl_dim_in, i + 1, 1);
+ isl_set *univ
+ = isl_set_universe (isl_space_domain (isl_aff_get_space (aff)));
+ isl_pw_aff *index = isl_pw_aff_alloc (univ, aff);
+
+ isl_id *id = isl_set_get_tuple_id (subscript_sizes);
+ lb = isl_pw_aff_set_tuple_id (lb, isl_dim_in, isl_id_copy (id));
+ ub = isl_pw_aff_set_tuple_id (ub, isl_dim_in, id);
+
+ /* low <= sub_i <= high */
+ isl_set *lbs = isl_pw_aff_ge_set (isl_pw_aff_copy (index), lb);
+ isl_set *ubs = isl_pw_aff_le_set (index, ub);
+ subscript_sizes = isl_set_intersect (subscript_sizes, lbs);
+ subscript_sizes = isl_set_intersect (subscript_sizes, ubs);
}
- return subscript_sizes;
+ return isl_set_coalesce (subscript_sizes);
}
-/* Build data accesses for DR in PBB. */
+/* Build data accesses for DRI. */
static void
build_poly_dr (dr_info &dri)
poly_bb_p pbb = dri.pbb;
data_reference_p dr = dri.dr;
scop_p scop = PBB_SCOP (pbb);
+ isl_id *id = isl_id_for_dr (scop);
{
isl_space *dc = isl_set_get_space (pbb->domain);
isl_dim_out, nb_out);
acc = isl_map_universe (space);
- acc = isl_map_set_tuple_id (acc, isl_dim_out, isl_id_for_dr (scop, dr));
+ acc = isl_map_set_tuple_id (acc, isl_dim_out, isl_id_copy (id));
}
acc = pdr_add_alias_set (acc, dri);
acc = pdr_add_memory_accesses (acc, dri);
{
- isl_id *id = isl_id_for_dr (scop, dr);
int nb = 1 + DR_NUM_DIMENSIONS (dr);
isl_space *space = isl_space_set_alloc (scop->isl_context, 0, nb);
subscript_sizes = pdr_add_data_dimensions (subscript_sizes, scop, dr);
}
- new_poly_dr (pbb,
- DR_IS_READ (dr) ? PDR_READ : PDR_WRITE,
- dr, DR_NUM_DIMENSIONS (dr), acc, subscript_sizes);
+ new_poly_dr (pbb, DR_STMT (dr), DR_IS_READ (dr) ? PDR_READ : PDR_WRITE,
+ acc, subscript_sizes);
}
-/* Compute alias-sets for all data references in DRS. */
-
static void
-build_alias_set (scop_p scop)
+build_poly_sr_1 (poly_bb_p pbb, gimple *stmt, tree var, enum poly_dr_type kind,
+ isl_map *acc, isl_set *subscript_sizes)
{
- int num_vertices = scop->drs.length ();
- struct graph *g = new_graph (num_vertices);
- dr_info dr1 (0), dr2 (0);
- int i, j;
- int *all_vertices;
-
- FOR_EACH_VEC_ELT (scop->drs, i, dr1)
- for (j = i+1; scop->drs.iterate (j, &dr2); j++)
- if (dr_may_alias_p (dr1.dr, dr2.dr, true))
- {
- add_edge (g, i, j);
- add_edge (g, j, i);
- }
-
- all_vertices = XNEWVEC (int, num_vertices);
- for (i = 0; i < num_vertices; i++)
- all_vertices[i] = i;
-
- graphds_dfs (g, all_vertices, num_vertices, NULL, true, NULL);
- free (all_vertices);
-
- for (i = 0; i < g->n_vertices; i++)
- scop->drs[i].alias_set = g->vertices[i].component + 1;
-
- free_graph (g);
+ int max_arrays = PARAM_VALUE (PARAM_GRAPHITE_MAX_ARRAYS_PER_SCOP);
+ /* Each scalar variables has a unique alias set number starting from
+ max_arrays. */
+ subscript_sizes = isl_set_fix_si (subscript_sizes, isl_dim_set, 0,
+ max_arrays + SSA_NAME_VERSION (var));
+
+ new_poly_dr (pbb, stmt, kind, add_scalar_version_numbers (acc, var),
+ subscript_sizes);
}
-/* Build data references in SCOP. */
+/* Record all cross basic block scalar variables in PBB. */
static void
-build_scop_drs (scop_p scop)
+build_poly_sr (poly_bb_p pbb)
{
- int i, j;
- poly_bb_p pbb;
+ scop_p scop = PBB_SCOP (pbb);
+ gimple_poly_bb_p gbb = PBB_BLACK_BOX (pbb);
+ vec<scalar_use> &reads = gbb->read_scalar_refs;
+ vec<tree> &writes = gbb->write_scalar_refs;
- /* Remove all the PBBs that do not have data references: these basic
- blocks are not handled in the polyhedral representation. */
- for (i = 0; SCOP_BBS (scop).iterate (i, &pbb); i++)
- if (GBB_DATA_REFS (PBB_BLACK_BOX (pbb)).is_empty ())
- {
- free_gimple_poly_bb (PBB_BLACK_BOX (pbb));
- free_poly_bb (pbb);
- SCOP_BBS (scop).ordered_remove (i);
- i--;
- }
+ isl_space *dc = isl_set_get_space (pbb->domain);
+ int nb_out = 1;
+ isl_space *space = isl_space_add_dims (isl_space_from_domain (dc),
+ isl_dim_out, nb_out);
+ isl_id *id = isl_id_for_dr (scop);
+ space = isl_space_set_tuple_id (space, isl_dim_set, isl_id_copy (id));
+ isl_map *acc = isl_map_universe (isl_space_copy (space));
+ acc = isl_map_set_tuple_id (acc, isl_dim_out, id);
+ isl_set *subscript_sizes = isl_set_nat_universe (space);
- data_reference_p dr;
- FOR_EACH_VEC_ELT (SCOP_BBS (scop), i, pbb)
- if (pbb)
- FOR_EACH_VEC_ELT (GBB_DATA_REFS (PBB_BLACK_BOX (pbb)), j, dr)
- scop->drs.safe_push (dr_info (dr, -1, pbb));
+ int i;
+ tree var;
+ FOR_EACH_VEC_ELT (writes, i, var)
+ build_poly_sr_1 (pbb, SSA_NAME_DEF_STMT (var), var, PDR_WRITE,
+ isl_map_copy (acc), isl_set_copy (subscript_sizes));
- build_alias_set (scop);
+ scalar_use *use;
+ FOR_EACH_VEC_ELT (reads, i, use)
+ build_poly_sr_1 (pbb, use->first, use->second, PDR_READ, isl_map_copy (acc),
+ isl_set_copy (subscript_sizes));
- dr_info dri (0);
- FOR_EACH_VEC_ELT (scop->drs, i, dri)
- build_poly_dr (dri);
+ isl_map_free (acc);
+ isl_set_free (subscript_sizes);
}
-/* Analyze all the data references of STMTS and add them to the
- GBB_DATA_REFS vector of BB. */
+/* Build data references in SCOP. */
static void
-analyze_drs_in_stmts (scop_p scop, basic_block bb, vec<gimple *> stmts)
+build_scop_drs (scop_p scop)
{
- sese region = SCOP_REGION (scop);
- if (!bb_in_sese_p (bb, region))
- return;
-
- loop_p nest = outermost_loop_in_sese (region, bb);
- loop_p loop = bb->loop_father;
- if (!loop_in_sese_p (loop, region))
- loop = nest;
-
- gimple_poly_bb_p gbb = gbb_from_bb (bb);
-
- gimple *stmt;
int i;
- FOR_EACH_VEC_ELT (stmts, i, stmt)
- {
- if (is_gimple_debug (stmt))
- continue;
+ dr_info *dri;
+ FOR_EACH_VEC_ELT (scop->drs, i, dri)
+ build_poly_dr (*dri);
- graphite_find_data_references_in_stmt (nest, loop, stmt,
- &GBB_DATA_REFS (gbb));
- }
+ poly_bb_p pbb;
+ FOR_EACH_VEC_ELT (scop->pbbs, i, pbb)
+ build_poly_sr (pbb);
}
-/* Insert STMT at the end of the STMTS sequence and then insert the
- statements from STMTS at INSERT_GSI and call analyze_drs_in_stmts
- on STMTS. */
+/* Add to the iteration DOMAIN one extra dimension for LOOP->num. */
-static void
-insert_stmts (scop_p scop, gimple *stmt, gimple_seq stmts,
- gimple_stmt_iterator insert_gsi)
+static isl_set *
+add_iter_domain_dimension (__isl_take isl_set *domain, loop_p loop, scop_p scop)
{
- gimple_stmt_iterator gsi;
- auto_vec<gimple *, 3> x;
-
- gimple_seq_add_stmt (&stmts, stmt);
- for (gsi = gsi_start (stmts); !gsi_end_p (gsi); gsi_next (&gsi))
- x.safe_push (gsi_stmt (gsi));
-
- gsi_insert_seq_before (&insert_gsi, stmts, GSI_SAME_STMT);
- analyze_drs_in_stmts (scop, gsi_bb (insert_gsi), x);
+ int loop_index = isl_set_dim (domain, isl_dim_set);
+ domain = isl_set_add_dims (domain, isl_dim_set, 1);
+ char name[50];
+ snprintf (name, sizeof(name), "i%d", loop->num);
+ isl_id *label = isl_id_alloc (scop->isl_context, name, NULL);
+ return isl_set_set_dim_id (domain, isl_dim_set, loop_index, label);
}
-/* Insert the assignment "RES := EXPR" just after AFTER_STMT. */
+/* Add constraints to DOMAIN for each loop from LOOP up to CONTEXT. */
-static void
-insert_out_of_ssa_copy (scop_p scop, tree res, tree expr, gimple *after_stmt)
+static isl_set *
+add_loop_constraints (scop_p scop, __isl_take isl_set *domain, loop_p loop,
+ loop_p context)
{
- gimple_stmt_iterator gsi;
- auto_vec<gimple *, 3> x;
- gimple_seq stmts;
- tree var = force_gimple_operand (expr, &stmts, true, NULL_TREE);
- gassign *stmt = gimple_build_assign (unshare_expr (res), var);
+ if (loop == context)
+ return domain;
+ const sese_l ®ion = scop->scop_info->region;
+ if (!loop_in_sese_p (loop, region))
+ return domain;
+
+ /* Recursion all the way up to the context loop. */
+ domain = add_loop_constraints (scop, domain, loop_outer (loop), context);
- gimple_seq_add_stmt (&stmts, stmt);
+ /* Then, build constraints over the loop in post-order: outer to inner. */
- for (gsi = gsi_start (stmts); !gsi_end_p (gsi); gsi_next (&gsi))
- x.safe_push (gsi_stmt (gsi));
+ int loop_index = isl_set_dim (domain, isl_dim_set);
+ if (dump_file)
+ fprintf (dump_file, "[sese-to-poly] adding one extra dimension to the "
+ "domain for loop_%d.\n", loop->num);
+ domain = add_iter_domain_dimension (domain, loop, scop);
+ isl_space *space = isl_set_get_space (domain);
- if (gimple_code (after_stmt) == GIMPLE_PHI)
+ /* 0 <= loop_i */
+ isl_local_space *ls = isl_local_space_from_space (isl_space_copy (space));
+ isl_constraint *c = isl_inequality_alloc (ls);
+ c = isl_constraint_set_coefficient_si (c, isl_dim_set, loop_index, 1);
+ if (dump_file)
{
- gsi = gsi_after_labels (gimple_bb (after_stmt));
- gsi_insert_seq_before (&gsi, stmts, GSI_NEW_STMT);
+ fprintf (dump_file, "[sese-to-poly] adding constraint to the domain: ");
+ print_isl_constraint (dump_file, c);
}
- else
+ domain = isl_set_add_constraint (domain, c);
+
+ tree nb_iters = number_of_latch_executions (loop);
+ if (TREE_CODE (nb_iters) == INTEGER_CST)
+ {
+ /* loop_i <= cst_nb_iters */
+ isl_local_space *ls = isl_local_space_from_space (space);
+ isl_constraint *c = isl_inequality_alloc (ls);
+ c = isl_constraint_set_coefficient_si (c, isl_dim_set, loop_index, -1);
+ mpz_t g;
+ mpz_init (g);
+ tree_int_to_gmp (nb_iters, g);
+ isl_val *v = isl_val_int_from_gmp (scop->isl_context, g);
+ mpz_clear (g);
+ c = isl_constraint_set_constant_val (c, v);
+ return isl_set_add_constraint (domain, c);
+ }
+ /* loop_i <= expr_nb_iters */
+ gcc_assert (!chrec_contains_undetermined (nb_iters));
+ nb_iters = scalar_evolution_in_region (region, loop, nb_iters);
+ gcc_assert (!chrec_contains_undetermined (nb_iters));
+
+ isl_pw_aff *aff_nb_iters = extract_affine (scop, nb_iters,
+ isl_space_copy (space));
+ isl_set *valid = isl_pw_aff_nonneg_set (isl_pw_aff_copy (aff_nb_iters));
+ valid = isl_set_project_out (valid, isl_dim_set, 0,
+ isl_set_dim (valid, isl_dim_set));
+
+ if (valid)
+ scop->param_context = isl_set_intersect (scop->param_context, valid);
+
+ ls = isl_local_space_from_space (isl_space_copy (space));
+ isl_aff *loop_i = isl_aff_set_coefficient_si (isl_aff_zero_on_domain (ls),
+ isl_dim_in, loop_index, 1);
+ isl_set *le = isl_pw_aff_le_set (isl_pw_aff_from_aff (loop_i),
+ isl_pw_aff_copy (aff_nb_iters));
+ if (dump_file)
{
- gsi = gsi_for_stmt (after_stmt);
- gsi_insert_seq_after (&gsi, stmts, GSI_NEW_STMT);
+ fprintf (dump_file, "[sese-to-poly] adding constraint to the domain: ");
+ print_isl_set (dump_file, le);
}
+ domain = isl_set_intersect (domain, le);
- analyze_drs_in_stmts (scop, gimple_bb (after_stmt), x);
-}
-
-/* Creates a poly_bb_p for basic_block BB from the existing PBB. */
-
-static void
-new_pbb_from_pbb (scop_p scop, poly_bb_p pbb, basic_block bb)
-{
- vec<data_reference_p> drs;
- drs.create (3);
- gimple_poly_bb_p gbb = PBB_BLACK_BOX (pbb);
- gimple_poly_bb_p gbb1 = new_gimple_poly_bb (bb, drs);
- poly_bb_p pbb1 = new_poly_bb (scop, gbb1);
- int index, n = SCOP_BBS (scop).length ();
+ widest_int nit;
+ if (!max_stmt_executions (loop, &nit))
+ {
+ isl_pw_aff_free (aff_nb_iters);
+ isl_space_free (space);
+ return domain;
+ }
- /* The INDEX of PBB in SCOP_BBS. */
- for (index = 0; index < n; index++)
- if (SCOP_BBS (scop)[index] == pbb)
- break;
+ /* NIT is an upper bound to NB_ITERS: "NIT >= NB_ITERS", although we
+ do not know whether the loop executes at least once. */
+ mpz_t g;
+ mpz_init (g);
+ wi::to_mpz (nit, g, SIGNED);
+ mpz_sub_ui (g, g, 1);
+
+ isl_pw_aff *approx = extract_affine_gmp (g, isl_space_copy (space));
+ isl_set *x = isl_pw_aff_ge_set (approx, aff_nb_iters);
+ x = isl_set_project_out (x, isl_dim_set, 0,
+ isl_set_dim (x, isl_dim_set));
+ scop->param_context = isl_set_intersect (scop->param_context, x);
+
+ ls = isl_local_space_from_space (space);
+ c = isl_inequality_alloc (ls);
+ c = isl_constraint_set_coefficient_si (c, isl_dim_set, loop_index, -1);
+ isl_val *v = isl_val_int_from_gmp (scop->isl_context, g);
+ mpz_clear (g);
+ c = isl_constraint_set_constant_val (c, v);
- pbb1->domain = isl_set_copy (pbb->domain);
- pbb1->domain = isl_set_set_tuple_id (pbb1->domain,
- isl_id_for_pbb (scop, pbb1));
+ if (dump_file)
+ {
+ fprintf (dump_file, "[sese-to-poly] adding constraint to the domain: ");
+ print_isl_constraint (dump_file, c);
+ }
- GBB_PBB (gbb1) = pbb1;
- GBB_CONDITIONS (gbb1) = GBB_CONDITIONS (gbb).copy ();
- GBB_CONDITION_CASES (gbb1) = GBB_CONDITION_CASES (gbb).copy ();
- SCOP_BBS (scop).safe_insert (index + 1, pbb1);
+ return isl_set_add_constraint (domain, c);
}
-/* Insert on edge E the assignment "RES := EXPR". */
+/* Builds the original iteration domains for each pbb in the SCOP. */
-static void
-insert_out_of_ssa_copy_on_edge (scop_p scop, edge e, tree res, tree expr)
+static int
+build_iteration_domains (scop_p scop, __isl_keep isl_set *context,
+ int index, loop_p context_loop)
{
- gimple_seq stmts = NULL;
- tree var = force_gimple_operand (expr, &stmts, true, NULL_TREE);
- gimple *stmt = gimple_build_assign (unshare_expr (res), var);
- auto_vec<gimple *, 3> x;
+ loop_p current = pbb_loop (scop->pbbs[index]);
+ isl_set *domain = isl_set_copy (context);
+ domain = add_loop_constraints (scop, domain, current, context_loop);
+ const sese_l ®ion = scop->scop_info->region;
+
+ int i;
+ poly_bb_p pbb;
+ FOR_EACH_VEC_ELT_FROM (scop->pbbs, i, pbb, index)
+ {
+ loop_p loop = pbb_loop (pbb);
+ if (current == loop)
+ {
+ pbb->iterators = isl_set_copy (domain);
+ pbb->domain = isl_set_copy (domain);
+ pbb->domain = isl_set_set_tuple_id (pbb->domain,
+ isl_id_for_pbb (scop, pbb));
+ add_conditions_to_domain (pbb);
- gimple_seq_add_stmt (&stmts, stmt);
- gimple_stmt_iterator gsi;
- for (gsi = gsi_start (stmts); !gsi_end_p (gsi); gsi_next (&gsi))
- x.safe_push (gsi_stmt (gsi));
+ if (dump_file)
+ {
+ fprintf (dump_file, "[sese-to-poly] set pbb_%d->domain: ",
+ pbb_index (pbb));
+ print_isl_set (dump_file, domain);
+ }
+ continue;
+ }
- gsi_insert_seq_on_edge (e, stmts);
- gsi_commit_edge_inserts ();
- basic_block bb = gimple_bb (stmt);
+ while (loop_in_sese_p (loop, region)
+ && current != loop)
+ loop = loop_outer (loop);
- if (!bb_in_sese_p (bb, SCOP_REGION (scop)))
- return;
+ if (current != loop)
+ {
+ /* A statement in a different loop nest than CURRENT loop. */
+ isl_set_free (domain);
+ return i;
+ }
- if (!gbb_from_bb (bb))
- new_pbb_from_pbb (scop, pbb_from_bb (e->src), bb);
+ /* A statement nested in the CURRENT loop. */
+ i = build_iteration_domains (scop, domain, i, current);
+ i--;
+ }
- analyze_drs_in_stmts (scop, bb, x);
+ isl_set_free (domain);
+ return i;
}
-/* Creates a zero dimension array of the same type as VAR. */
+/* Assign dimension for each parameter in SCOP and add constraints for the
+ parameters. */
-static tree
-create_zero_dim_array (tree var, const char *base_name)
+static void
+build_scop_context (scop_p scop)
{
- 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, base_name);
+ sese_info_p region = scop->scop_info;
+ unsigned nbp = sese_nb_params (region);
+ isl_space *space = isl_space_set_alloc (scop->isl_context, nbp, 0);
- return build4 (ARRAY_REF, elt_type, base, integer_zero_node, NULL_TREE,
- NULL_TREE);
+ unsigned i;
+ tree e;
+ FOR_EACH_VEC_ELT (region->params, i, e)
+ space = isl_space_set_dim_id (space, isl_dim_param, i,
+ isl_id_for_ssa_name (scop, e));
+
+ scop->param_context = isl_set_universe (space);
+
+ graphite_dim_t p;
+ for (p = 0; p < nbp; p++)
+ add_param_constraints (scop, p);
}
-/* Returns true when PHI is a loop close phi node. */
+/* Return true when loop A is nested in loop B. */
static bool
-scalar_close_phi_node_p (gimple *phi)
+nested_in (loop_p a, loop_p b)
{
- if (gimple_code (phi) != GIMPLE_PHI
- || virtual_operand_p (gimple_phi_result (phi)))
- return false;
-
- /* Note that loop close phi nodes should have a single argument
- because we translated the representation into a canonical form
- before Graphite: see canonicalize_loop_closed_ssa_form. */
- return (gimple_phi_num_args (phi) == 1);
+ return b == find_common_loop (a, b);
}
-/* For a definition DEF in REGION, propagates the expression EXPR in
- all the uses of DEF outside REGION. */
-
-static void
-propagate_expr_outside_region (tree def, tree expr, sese region)
+/* Return the loop at a specific SCOP->pbbs[*INDEX]. */
+static loop_p
+loop_at (scop_p scop, int *index)
{
- gimple_seq stmts;
- bool replaced_once = false;
-
- gcc_assert (TREE_CODE (def) == SSA_NAME);
+ return pbb_loop (scop->pbbs[*index]);
+}
- expr = force_gimple_operand (unshare_expr (expr), &stmts, true,
- NULL_TREE);
+/* Return the index of any pbb belonging to loop or a subloop of A. */
- imm_use_iterator imm_iter;
- gimple *use_stmt;
- FOR_EACH_IMM_USE_STMT (use_stmt, imm_iter, def)
- if (!is_gimple_debug (use_stmt)
- && !bb_in_sese_p (gimple_bb (use_stmt), region))
+static int
+index_outermost_in_loop (loop_p a, scop_p scop)
+{
+ int i, outermost = -1;
+ int last_depth = -1;
+ poly_bb_p pbb;
+ FOR_EACH_VEC_ELT (scop->pbbs, i, pbb)
+ if (nested_in (pbb_loop (pbb), a)
+ && (last_depth == -1
+ || last_depth > (int) loop_depth (pbb_loop (pbb))))
{
- ssa_op_iter iter;
- use_operand_p use_p;
-
- FOR_EACH_PHI_OR_STMT_USE (use_p, use_stmt, iter, SSA_OP_ALL_USES)
- if (operand_equal_p (def, USE_FROM_PTR (use_p), 0)
- && (replaced_once = true))
- replace_exp (use_p, expr);
-
- update_stmt (use_stmt);
+ outermost = i;
+ last_depth = loop_depth (pbb_loop (pbb));
}
-
- if (replaced_once)
- {
- gsi_insert_seq_on_edge (SESE_ENTRY (region), stmts);
- gsi_commit_edge_inserts ();
- }
+ return outermost;
}
-/* Rewrite out of SSA the reduction phi node at PSI by creating a zero
- dimension array for it. */
+/* Return the index of any pbb belonging to loop or a subloop of A. */
-static void
-rewrite_close_phi_out_of_ssa (scop_p scop, gimple_stmt_iterator *psi)
+static int
+index_pbb_in_loop (loop_p a, scop_p scop)
{
- sese region = SCOP_REGION (scop);
- gimple *phi = gsi_stmt (*psi);
- tree res = gimple_phi_result (phi);
- basic_block bb = gimple_bb (phi);
- gimple_stmt_iterator gsi = gsi_after_labels (bb);
- tree arg = gimple_phi_arg_def (phi, 0);
- gimple *stmt;
-
- /* Note that loop close phi nodes should have a single argument
- because we translated the representation into a canonical form
- before Graphite: see canonicalize_loop_closed_ssa_form. */
- gcc_assert (gimple_phi_num_args (phi) == 1);
-
- /* The phi node can be a non close phi node, when its argument is
- invariant, or a default definition. */
- if (is_gimple_min_invariant (arg)
- || SSA_NAME_IS_DEFAULT_DEF (arg))
- {
- propagate_expr_outside_region (res, arg, region);
- gsi_next (psi);
- return;
- }
-
- else if (gimple_bb (SSA_NAME_DEF_STMT (arg))->loop_father == bb->loop_father)
- {
- propagate_expr_outside_region (res, arg, region);
- stmt = gimple_build_assign (res, arg);
- remove_phi_node (psi, false);
- gsi_insert_before (&gsi, stmt, GSI_NEW_STMT);
- return;
- }
-
- /* If res is scev analyzable and is not a scalar value, it is safe
- to ignore the close phi node: it will be code generated in the
- out of Graphite pass. */
- else if (scev_analyzable_p (res, region))
- {
- loop_p loop = loop_containing_stmt (SSA_NAME_DEF_STMT (res));
- tree scev;
-
- if (!loop_in_sese_p (loop, region))
- {
- loop = loop_containing_stmt (SSA_NAME_DEF_STMT (arg));
- scev = scalar_evolution_in_region (region, loop, arg);
- scev = compute_overall_effect_of_inner_loop (loop, scev);
- }
- else
- scev = scalar_evolution_in_region (region, loop, res);
-
- if (tree_does_not_contain_chrecs (scev))
- propagate_expr_outside_region (res, scev, region);
-
- gsi_next (psi);
- return;
- }
- else
- {
- tree zero_dim_array = create_zero_dim_array (res, "Close_Phi");
-
- stmt = gimple_build_assign (res, unshare_expr (zero_dim_array));
-
- if (TREE_CODE (arg) == SSA_NAME)
- insert_out_of_ssa_copy (scop, zero_dim_array, arg,
- SSA_NAME_DEF_STMT (arg));
- else
- insert_out_of_ssa_copy_on_edge (scop, single_pred_edge (bb),
- zero_dim_array, arg);
- }
-
- remove_phi_node (psi, false);
- SSA_NAME_DEF_STMT (res) = stmt;
-
- insert_stmts (scop, stmt, NULL, gsi_after_labels (bb));
+ int i;
+ poly_bb_p pbb;
+ FOR_EACH_VEC_ELT (scop->pbbs, i, pbb)
+ if (pbb_loop (pbb) == a)
+ return i;
+ return -1;
}
-/* Rewrite out of SSA the reduction phi node at PSI by creating a zero
- dimension array for it. */
-
-static void
-rewrite_phi_out_of_ssa (scop_p scop, gphi_iterator *psi)
+static poly_bb_p
+outermost_pbb_in (loop_p loop, scop_p scop)
{
- gphi *phi = psi->phi ();
- basic_block bb = gimple_bb (phi);
- tree res = gimple_phi_result (phi);
- tree zero_dim_array = create_zero_dim_array (res, "phi_out_of_ssa");
-
- for (size_t i = 0; i < gimple_phi_num_args (phi); i++)
- {
- tree arg = gimple_phi_arg_def (phi, i);
- edge e = gimple_phi_arg_edge (phi, i);
-
- /* Avoid the insertion of code in the loop latch to please the
- pattern matching of the vectorizer. */
- if (TREE_CODE (arg) == SSA_NAME
- && !SSA_NAME_IS_DEFAULT_DEF (arg)
- && e->src == bb->loop_father->latch)
- insert_out_of_ssa_copy (scop, zero_dim_array, arg,
- SSA_NAME_DEF_STMT (arg));
- else
- insert_out_of_ssa_copy_on_edge (scop, e, zero_dim_array, arg);
- }
-
- gimple *stmt = gimple_build_assign (res, unshare_expr (zero_dim_array));
- remove_phi_node (psi, false);
- insert_stmts (scop, stmt, NULL, gsi_after_labels (bb));
+ int x = index_pbb_in_loop (loop, scop);
+ if (x == -1)
+ x = index_outermost_in_loop (loop, scop);
+ return scop->pbbs[x];
}
-/* Rewrite the degenerate phi node at position PSI from the degenerate
- form "x = phi (y, y, ..., y)" to "x = y". */
-
-static void
-rewrite_degenerate_phi (gphi_iterator *psi)
+static isl_schedule *
+add_in_sequence (__isl_take isl_schedule *a, __isl_take isl_schedule *b)
{
- gphi *phi = psi->phi ();
- tree res = gimple_phi_result (phi);
+ gcc_assert (a || b);
- basic_block bb = gimple_bb (phi);
- tree rhs = degenerate_phi_result (phi);
- gcc_assert (rhs);
+ if (!a)
+ return b;
- gimple *stmt = gimple_build_assign (res, rhs);
- remove_phi_node (psi, false);
+ if (!b)
+ return a;
- gimple_stmt_iterator gsi = gsi_after_labels (bb);
- gsi_insert_before (&gsi, stmt, GSI_NEW_STMT);
+ return isl_schedule_sequence (a, b);
}
-/* Rewrite out of SSA all the reduction phi nodes of SCOP. */
+struct map_to_dimension_data {
+ int n;
+ isl_union_pw_multi_aff *res;
+};
-static void
-rewrite_reductions_out_of_ssa (scop_p scop)
+/* Create a function that maps the elements of SET to its N-th dimension and add
+ it to USER->res. */
+
+static isl_stat
+add_outer_projection (__isl_take isl_set *set, void *user)
{
- basic_block bb;
- sese region = SCOP_REGION (scop);
+ struct map_to_dimension_data *data = (struct map_to_dimension_data *) user;
+ int dim = isl_set_dim (set, isl_dim_set);
+ isl_space *space = isl_set_get_space (set);
+
+ gcc_assert (dim >= data->n);
+ isl_pw_multi_aff *pma
+ = isl_pw_multi_aff_project_out_map (space, isl_dim_set, data->n,
+ dim - data->n);
+ data->res = isl_union_pw_multi_aff_add_pw_multi_aff (data->res, pma);
+
+ isl_set_free (set);
+ return isl_stat_ok;
+}
- FOR_EACH_BB_FN (bb, cfun)
- if (bb_in_sese_p (bb, region))
- for (gphi_iterator psi = gsi_start_phis (bb); !gsi_end_p (psi);)
- {
- gphi *phi = psi.phi ();
+/* Return SET in which all inner dimensions above N are removed. */
- if (virtual_operand_p (gimple_phi_result (phi)))
- {
- gsi_next (&psi);
- continue;
- }
+static isl_multi_union_pw_aff *
+outer_projection_mupa (__isl_take isl_union_set *set, int n)
+{
+ gcc_assert (n >= 0);
+ gcc_assert (set);
+ gcc_assert (!isl_union_set_is_empty (set));
- if (gimple_phi_num_args (phi) > 1
- && degenerate_phi_result (phi))
- rewrite_degenerate_phi (&psi);
+ isl_space *space = isl_union_set_get_space (set);
+ isl_union_pw_multi_aff *pwaff = isl_union_pw_multi_aff_empty (space);
- else if (scalar_close_phi_node_p (phi))
- rewrite_close_phi_out_of_ssa (scop, &psi);
+ struct map_to_dimension_data data = {n, pwaff};
- else if (reduction_phi_p (region, &psi))
- rewrite_phi_out_of_ssa (scop, &psi);
- }
+ if (isl_union_set_foreach_set (set, &add_outer_projection, &data) < 0)
+ data.res = isl_union_pw_multi_aff_free (data.res);
- update_ssa (TODO_update_ssa);
-#ifdef ENABLE_CHECKING
- verify_loop_closed_ssa (true);
-#endif
+ isl_union_set_free (set);
+ return isl_multi_union_pw_aff_from_union_pw_multi_aff (data.res);
}
-/* Rewrite the scalar dependence of DEF used in USE_STMT with a memory
- read from ZERO_DIM_ARRAY. */
+/* Embed SCHEDULE in the constraints of the LOOP domain. */
-static void
-rewrite_cross_bb_scalar_dependence (scop_p scop, tree zero_dim_array,
- tree def, gimple *use_stmt)
+static isl_schedule *
+add_loop_schedule (__isl_take isl_schedule *schedule, loop_p loop,
+ scop_p scop)
{
- gcc_assert (gimple_code (use_stmt) != GIMPLE_PHI);
-
- tree name = copy_ssa_name (def);
- gimple *name_stmt = gimple_build_assign (name, zero_dim_array);
+ poly_bb_p pbb = outermost_pbb_in (loop, scop);
+ isl_set *iterators = pbb->iterators;
- gimple_assign_set_lhs (name_stmt, name);
- insert_stmts (scop, name_stmt, NULL, gsi_for_stmt (use_stmt));
-
- ssa_op_iter iter;
- use_operand_p use_p;
- 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);
-}
+ int empty = isl_set_is_empty (iterators);
+ if (empty < 0 || empty)
+ return empty < 0 ? isl_schedule_free (schedule) : schedule;
-/* For every definition DEF in the SCOP that is used outside the scop,
- insert a closing-scop definition in the basic block just after this
- SCOP. */
+ isl_space *space = isl_set_get_space (iterators);
+ int loop_index = isl_space_dim (space, isl_dim_set) - 1;
-static void
-handle_scalar_deps_crossing_scop_limits (scop_p scop, tree def, gimple *stmt)
-{
- tree var = create_tmp_reg (TREE_TYPE (def));
- tree new_name = make_ssa_name (var, stmt);
- bool needs_copy = false;
- sese region = SCOP_REGION (scop);
-
- imm_use_iterator imm_iter;
- gimple *use_stmt;
- FOR_EACH_IMM_USE_STMT (use_stmt, imm_iter, def)
+ loop_p ploop = pbb_loop (pbb);
+ while (loop != ploop)
{
- if (!bb_in_sese_p (gimple_bb (use_stmt), region))
- {
- use_operand_p use_p;
- FOR_EACH_IMM_USE_ON_STMT (use_p, imm_iter)
- {
- SET_USE (use_p, new_name);
- }
- update_stmt (use_stmt);
- needs_copy = true;
- }
+ --loop_index;
+ ploop = loop_outer (ploop);
}
- /* Insert in the empty BB just after the scop a use of DEF such
- that the rewrite of cross_bb_scalar_dependences won't insert
- arrays everywhere else. */
- if (needs_copy)
- {
- gimple *assign = gimple_build_assign (new_name, def);
- gimple_stmt_iterator psi = gsi_after_labels (SESE_EXIT (region)->dest);
-
- update_stmt (assign);
- gsi_insert_before (&psi, assign, GSI_SAME_STMT);
- }
+ isl_local_space *ls = isl_local_space_from_space (space);
+ isl_aff *aff = isl_aff_var_on_domain (ls, isl_dim_set, loop_index);
+ isl_multi_aff *prefix = isl_multi_aff_from_aff (aff);
+ char name[50];
+ snprintf (name, sizeof(name), "L_%d", loop->num);
+ isl_id *label = isl_id_alloc (isl_schedule_get_ctx (schedule),
+ name, NULL);
+ prefix = isl_multi_aff_set_tuple_id (prefix, isl_dim_out, label);
+
+ int n = isl_multi_aff_dim (prefix, isl_dim_in);
+ isl_union_set *domain = isl_schedule_get_domain (schedule);
+ isl_multi_union_pw_aff *mupa = outer_projection_mupa (domain, n);
+ mupa = isl_multi_union_pw_aff_apply_multi_aff (mupa, prefix);
+ return isl_schedule_insert_partial_schedule (schedule, mupa);
}
-/* Rewrite the scalar dependences crossing the boundary of the BB
- containing STMT with an array. Return true when something has been
- changed. */
+/* Build schedule for the pbb at INDEX. */
-static bool
-rewrite_cross_bb_scalar_deps (scop_p scop, gimple_stmt_iterator *gsi)
+static isl_schedule *
+build_schedule_pbb (scop_p scop, int *index)
{
- sese region = SCOP_REGION (scop);
- gimple *stmt = gsi_stmt (*gsi);
- imm_use_iterator imm_iter;
- tree def;
- tree zero_dim_array = NULL_TREE;
- gimple *use_stmt;
- bool res = false;
-
- switch (gimple_code (stmt))
- {
- case GIMPLE_ASSIGN:
- def = gimple_assign_lhs (stmt);
- break;
+ poly_bb_p pbb = scop->pbbs[*index];
+ ++*index;
+ isl_set *domain = isl_set_copy (pbb->domain);
+ isl_union_set *ud = isl_union_set_from_set (domain);
+ return isl_schedule_from_domain (ud);
+}
- case GIMPLE_CALL:
- def = gimple_call_lhs (stmt);
- break;
+static isl_schedule *build_schedule_loop_nest (scop_p, int *, loop_p);
- default:
- return false;
- }
+/* Build the schedule of the loop containing the SCOP pbb at INDEX. */
- if (!def
- || !is_gimple_reg (def))
- return false;
+static isl_schedule *
+build_schedule_loop (scop_p scop, int *index)
+{
+ int max = scop->pbbs.length ();
+ gcc_assert (*index < max);
+ loop_p loop = loop_at (scop, index);
- if (scev_analyzable_p (def, region))
+ isl_schedule *s = NULL;
+ while (nested_in (loop_at (scop, index), loop))
{
- loop_p loop = loop_containing_stmt (SSA_NAME_DEF_STMT (def));
- tree scev = scalar_evolution_in_region (region, loop, def);
-
- if (tree_contains_chrecs (scev, NULL))
- return false;
+ if (loop == loop_at (scop, index))
+ s = add_in_sequence (s, build_schedule_pbb (scop, index));
+ else
+ s = add_in_sequence (s, build_schedule_loop_nest (scop, index, loop));
- propagate_expr_outside_region (def, scev, region);
- return true;
+ if (*index == max)
+ break;
}
- basic_block def_bb = gimple_bb (stmt);
+ return add_loop_schedule (s, loop, scop);
+}
- handle_scalar_deps_crossing_scop_limits (scop, def, stmt);
+/* S is the schedule of the loop LOOP. Embed the schedule S in all outer loops.
+ When CONTEXT_LOOP is null, embed the schedule in all loops contained in the
+ SCOP surrounding LOOP. When CONTEXT_LOOP is non null, only embed S in the
+ maximal loop nest contained within CONTEXT_LOOP. */
- FOR_EACH_IMM_USE_STMT (use_stmt, imm_iter, def)
- if (gphi *phi = dyn_cast <gphi *> (use_stmt))
- {
- res = true;
- gphi_iterator psi = gsi_for_phi (phi);
+static isl_schedule *
+embed_in_surrounding_loops (__isl_take isl_schedule *s, scop_p scop,
+ loop_p loop, int *index, loop_p context_loop)
+{
+ loop_p outer = loop_outer (loop);
+ sese_l region = scop->scop_info->region;
+ if (context_loop == outer
+ || !loop_in_sese_p (outer, region))
+ return s;
+
+ int max = scop->pbbs.length ();
+ if (*index == max
+ || (context_loop && !nested_in (loop_at (scop, index), context_loop))
+ || (!context_loop
+ && !loop_in_sese_p (find_common_loop (outer, loop_at (scop, index)),
+ region)))
+ return embed_in_surrounding_loops (add_loop_schedule (s, outer, scop),
+ scop, outer, index, context_loop);
+
+ bool a_pbb;
+ while ((a_pbb = (outer == loop_at (scop, index)))
+ || nested_in (loop_at (scop, index), outer))
+ {
+ if (a_pbb)
+ s = add_in_sequence (s, build_schedule_pbb (scop, index));
+ else
+ s = add_in_sequence (s, build_schedule_loop (scop, index));
- if (scalar_close_phi_node_p (gsi_stmt (psi)))
- rewrite_close_phi_out_of_ssa (scop, &psi);
- else
- rewrite_phi_out_of_ssa (scop, &psi);
- }
+ if (*index == max)
+ break;
+ }
- FOR_EACH_IMM_USE_STMT (use_stmt, imm_iter, def)
- if (gimple_code (use_stmt) != GIMPLE_PHI
- && def_bb != gimple_bb (use_stmt)
- && !is_gimple_debug (use_stmt)
- && (res = true))
- {
- if (!zero_dim_array)
- {
- zero_dim_array = create_zero_dim_array
- (def, "Cross_BB_scalar_dependence");
- insert_out_of_ssa_copy (scop, zero_dim_array, def,
- SSA_NAME_DEF_STMT (def));
- gsi_next (gsi);
- }
+ /* We reached the end of the OUTER loop: embed S in OUTER. */
+ return embed_in_surrounding_loops (add_loop_schedule (s, outer, scop), scop,
+ outer, index, context_loop);
+}
- rewrite_cross_bb_scalar_dependence (scop, unshare_expr (zero_dim_array),
- def, use_stmt);
- }
+/* Build schedule for the full loop nest containing the pbb at INDEX. When
+ CONTEXT_LOOP is null, build the schedule of all loops contained in the SCOP
+ surrounding the pbb. When CONTEXT_LOOP is non null, only build the maximal loop
+ nest contained within CONTEXT_LOOP. */
- update_ssa (TODO_update_ssa);
+static isl_schedule *
+build_schedule_loop_nest (scop_p scop, int *index, loop_p context_loop)
+{
+ gcc_assert (*index != (int) scop->pbbs.length ());
- return res;
+ loop_p loop = loop_at (scop, index);
+ isl_schedule *s = build_schedule_loop (scop, index);
+ return embed_in_surrounding_loops (s, scop, loop, index, context_loop);
}
-/* Rewrite out of SSA all the reduction phi nodes of SCOP. */
+/* Build the schedule of the SCOP. */
-static void
-rewrite_cross_bb_scalar_deps_out_of_ssa (scop_p scop)
+static bool
+build_original_schedule (scop_p scop)
{
- basic_block bb;
- gimple_stmt_iterator psi;
- sese region = SCOP_REGION (scop);
- bool changed = false;
-
- /* Create an extra empty BB after the scop. */
- split_edge (SESE_EXIT (region));
+ int i = 0;
+ int n = scop->pbbs.length ();
+ while (i < n)
+ {
+ poly_bb_p pbb = scop->pbbs[i];
+ isl_schedule *s = NULL;
+ if (!loop_in_sese_p (pbb_loop (pbb), scop->scop_info->region))
+ s = build_schedule_pbb (scop, &i);
+ else
+ s = build_schedule_loop_nest (scop, &i, NULL);
- FOR_EACH_BB_FN (bb, cfun)
- if (bb_in_sese_p (bb, region))
- for (psi = gsi_start_bb (bb); !gsi_end_p (psi); gsi_next (&psi))
- changed |= rewrite_cross_bb_scalar_deps (scop, &psi);
+ scop->original_schedule = add_in_sequence (scop->original_schedule, s);
+ }
- if (changed)
+ if (dump_file)
{
- scev_reset_htab ();
- update_ssa (TODO_update_ssa);
-#ifdef ENABLE_CHECKING
- verify_loop_closed_ssa (true);
-#endif
+ fprintf (dump_file, "[sese-to-poly] original schedule:\n");
+ print_isl_schedule (dump_file, scop->original_schedule);
}
+ if (!scop->original_schedule)
+ return false;
+ return true;
}
/* Builds the polyhedral representation for a SESE region. */
-void
+bool
build_poly_scop (scop_p scop)
{
- set_scop_parameter_dim (scop);
- build_scop_iteration_domain (scop);
build_scop_context (scop);
- add_conditions_to_constraints (scop);
- /* Rewrite out of SSA only after having translated the
- representation to the polyhedral representation to avoid scev
- analysis failures. That means that these functions will insert
- new data references that they create in the right place. */
- rewrite_reductions_out_of_ssa (scop);
- rewrite_cross_bb_scalar_deps_out_of_ssa (scop);
+ unsigned i = 0;
+ unsigned n = scop->pbbs.length ();
+ while (i < n)
+ i = build_iteration_domains (scop, scop->param_context, i, NULL);
build_scop_drs (scop);
- build_scop_scattering (scop);
-
- /* This SCoP has been translated to the polyhedral
- representation. */
- POLY_SCOP_P (scop) = true;
+ build_original_schedule (scop);
+ return true;
}
#endif /* HAVE_isl */
projects / thirdparty / gcc.git / blobdiff