/* Data dependence analysis for Graphite.
- Copyright (C) 2009-2013 Free Software Foundation, Inc.
+ Copyright (C) 2009-2016 Free Software Foundation, Inc.
Contributed by Sebastian Pop <sebastian.pop@amd.com> and
Konrad Trifunovic <konrad.trifunovic@inria.fr>.
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
+#define USES_ISL
+
#include "config.h"
-#ifdef HAVE_cloog
-#include <isl/set.h>
-#include <isl/map.h>
-#include <isl/union_map.h>
-#include <isl/flow.h>
-#include <isl/constraint.h>
-#include <cloog/cloog.h>
-#include <cloog/isl/domain.h>
-#endif
+#ifdef HAVE_isl
#include "system.h"
#include "coretypes.h"
+#include "backend.h"
+#include "cfghooks.h"
#include "tree.h"
#include "gimple.h"
+#include "fold-const.h"
+#include "gimple-iterator.h"
#include "tree-ssa-loop.h"
#include "tree-pass.h"
#include "cfgloop.h"
-#include "tree-chrec.h"
#include "tree-data-ref.h"
-#include "tree-scalar-evolution.h"
-#include "sese.h"
-
-#ifdef HAVE_cloog
-#include "graphite-poly.h"
-#include "graphite-htab.h"
+#include "graphite.h"
/* Add the constraints from the set S to the domain of MAP. */
return isl_map_intersect_domain (map, s);
}
-/* Constrain pdr->accesses with pdr->extent and pbb->domain. */
+/* Constrain pdr->accesses with pdr->subscript_sizes and pbb->domain. */
static isl_map *
add_pdr_constraints (poly_dr_p pdr, poly_bb_p pbb)
{
isl_map *x = isl_map_intersect_range (isl_map_copy (pdr->accesses),
- isl_set_copy (pdr->extent));
+ isl_set_copy (pdr->subscript_sizes));
x = constrain_domain (x, isl_set_copy (pbb->domain));
return x;
}
int i, j;
poly_bb_p pbb;
poly_dr_p pdr;
- isl_space *space = isl_set_get_space (scop->context);
+ isl_space *space = isl_set_get_space (scop->param_context);
isl_union_map *res = isl_union_map_empty (space);
FOR_EACH_VEC_ELT (pbbs, i, pbb)
{
FOR_EACH_VEC_ELT (PBB_DRS (pbb), j, pdr)
if (pdr_read_p (pdr))
- res = isl_union_map_add_map (res, add_pdr_constraints (pdr, pbb));
+ {
+ if (dump_file)
+ {
+ fprintf (dump_file, "Adding read to depedence graph: ");
+ print_pdr (dump_file, pdr);
+ }
+ res = isl_union_map_add_map (res, add_pdr_constraints (pdr, pbb));
+ if (dump_file)
+ {
+ fprintf (dump_file, "Reads depedence graph: ");
+ print_isl_union_map (dump_file, res);
+ }
+ }
}
return res;
int i, j;
poly_bb_p pbb;
poly_dr_p pdr;
- isl_space *space = isl_set_get_space (scop->context);
+ isl_space *space = isl_set_get_space (scop->param_context);
isl_union_map *res = isl_union_map_empty (space);
FOR_EACH_VEC_ELT (pbbs, i, pbb)
{
FOR_EACH_VEC_ELT (PBB_DRS (pbb), j, pdr)
if (pdr_write_p (pdr))
- res = isl_union_map_add_map (res, add_pdr_constraints (pdr, pbb));
+ {
+ if (dump_file)
+ {
+ fprintf (dump_file, "Adding must write to depedence graph: ");
+ print_pdr (dump_file, pdr);
+ }
+ res = isl_union_map_add_map (res, add_pdr_constraints (pdr, pbb));
+ if (dump_file)
+ {
+ fprintf (dump_file, "Must writes depedence graph: ");
+ print_isl_union_map (dump_file, res);
+ }
+ }
}
return res;
int i, j;
poly_bb_p pbb;
poly_dr_p pdr;
- isl_space *space = isl_set_get_space (scop->context);
+ isl_space *space = isl_set_get_space (scop->param_context);
isl_union_map *res = isl_union_map_empty (space);
FOR_EACH_VEC_ELT (pbbs, i, pbb)
{
FOR_EACH_VEC_ELT (PBB_DRS (pbb), j, pdr)
if (pdr_may_write_p (pdr))
- res = isl_union_map_add_map (res, add_pdr_constraints (pdr, pbb));
+ {
+ if (dump_file)
+ {
+ fprintf (dump_file, "Adding may write to depedence graph: ");
+ print_pdr (dump_file, pdr);
+ }
+ res = isl_union_map_add_map (res, add_pdr_constraints (pdr, pbb));
+ if (dump_file)
+ {
+ fprintf (dump_file, "May writes depedence graph: ");
+ print_isl_union_map (dump_file, res);
+ }
+ }
}
return res;
{
int i;
poly_bb_p pbb;
- isl_space *space = isl_set_get_space (scop->context);
+ isl_space *space = isl_set_get_space (scop->param_context);
isl_union_map *res = isl_union_map_empty (space);
FOR_EACH_VEC_ELT (pbbs, i, pbb)
return res;
}
-/* Returns all the transformed schedules in SCOP. */
-
-static isl_union_map *
-scop_get_transformed_schedule (scop_p scop, vec<poly_bb_p> pbbs)
-{
- int i;
- poly_bb_p pbb;
- isl_space *space = isl_set_get_space (scop->context);
- isl_union_map *res = isl_union_map_empty (space);
-
- FOR_EACH_VEC_ELT (pbbs, i, pbb)
- {
- res = isl_union_map_add_map
- (res, constrain_domain (isl_map_copy (pbb->transformed),
- isl_set_copy (pbb->domain)));
- }
-
- return res;
-}
-
/* Helper function used on each MAP of a isl_union_map. Computes the
maximal output dimension. */
-static int
+static isl_stat
max_number_of_out_dimensions (__isl_take isl_map *map, void *user)
{
int global_max = *((int *) user);
isl_map_free (map);
isl_space_free (space);
- return 0;
+ return isl_stat_ok;
}
/* Extends the output dimension of MAP to MAX dimensions. */
/* Helper function for extend_schedule. */
-static int
+static isl_stat
extend_schedule_1 (__isl_take isl_map *map, void *user)
{
struct extend_schedule_str *str = (struct extend_schedule_str *) user;
str->umap = isl_union_map_add_map (str->umap, extend_map (map, str->max));
- return 0;
+ return isl_stat_ok;
}
/* Return a relation that has uniform output dimensions. */
-__isl_give isl_union_map *
+static __isl_give isl_union_map *
extend_schedule (__isl_take isl_union_map *x)
{
int max = 0;
- int res;
struct extend_schedule_str str;
- res = isl_union_map_foreach_map (x, max_number_of_out_dimensions, (void *) &max);
- gcc_assert (res == 0);
-
+ isl_union_map_foreach_map (x, max_number_of_out_dimensions, (void *) &max);
str.max = max;
str.umap = isl_union_map_empty (isl_union_map_get_space (x));
- res = isl_union_map_foreach_map (x, extend_schedule_1, (void *) &str);
- gcc_assert (res == 0);
-
+ isl_union_map_foreach_map (x, extend_schedule_1, (void *) &str);
isl_union_map_free (x);
return str.umap;
}
ux = isl_union_map_copy (deps);
ux = isl_union_map_apply_domain (ux, isl_union_map_copy (trans));
ux = isl_union_map_apply_range (ux, trans);
+ if (isl_union_map_is_empty (ux))
+ {
+ isl_union_map_free (ux);
+ return NULL;
+ }
x = isl_map_from_union_map (ux);
return x;
}
-/* Return true when SCHEDULE does not violate the data DEPS: that is
- when the intersection of LEX with the DEPS transformed by SCHEDULE
- is empty. LEX is the relation in which the outputs occur before
- the inputs. */
-
-static bool
-no_violations (__isl_keep isl_union_map *schedule,
- __isl_keep isl_union_map *deps)
-{
- bool res;
- isl_space *space;
- isl_map *lex, *x;
-
- if (isl_union_map_is_empty (deps))
- return true;
-
- x = apply_schedule_on_deps (schedule, deps);
- space = isl_map_get_space (x);
- space = isl_space_range (space);
- lex = isl_map_lex_ge (space);
- x = isl_map_intersect (x, lex);
- res = isl_map_is_empty (x);
-
- isl_map_free (x);
- return res;
-}
-
/* Return true when DEPS is non empty and the intersection of LEX with
the DEPS transformed by SCHEDULE is non empty. LEX is the relation
in which all the inputs before DEPTH occur at the same time as the
output, and the input at DEPTH occurs before output. */
-static bool
+bool
carries_deps (__isl_keep isl_union_map *schedule,
__isl_keep isl_union_map *deps,
int depth)
return false;
x = apply_schedule_on_deps (schedule, deps);
+ if (x == NULL)
+ return false;
space = isl_map_get_space (x);
space = isl_space_range (space);
lex = isl_map_lex_le (space);
return res;
}
-/* Subtract from the RAW, WAR, and WAW dependences those relations
- that have been marked as belonging to an associative commutative
- reduction. */
-
-static void
-subtract_commutative_associative_deps (scop_p scop,
- vec<poly_bb_p> pbbs,
- isl_union_map *original,
- isl_union_map **must_raw,
- isl_union_map **may_raw,
- isl_union_map **must_raw_no_source,
- isl_union_map **may_raw_no_source,
- isl_union_map **must_war,
- isl_union_map **may_war,
- isl_union_map **must_war_no_source,
- isl_union_map **may_war_no_source,
- isl_union_map **must_waw,
- isl_union_map **may_waw,
- isl_union_map **must_waw_no_source,
- isl_union_map **may_waw_no_source)
-{
- int i, j;
- poly_bb_p pbb;
- poly_dr_p pdr;
- isl_space *space = isl_set_get_space (scop->context);
-
- FOR_EACH_VEC_ELT (pbbs, i, pbb)
- if (PBB_IS_REDUCTION (pbb))
- {
- int res;
- isl_union_map *r = isl_union_map_empty (isl_space_copy (space));
- isl_union_map *must_w = isl_union_map_empty (isl_space_copy (space));
- isl_union_map *may_w = isl_union_map_empty (isl_space_copy (space));
- isl_union_map *all_w;
- isl_union_map *empty;
- isl_union_map *x_must_raw;
- isl_union_map *x_may_raw;
- isl_union_map *x_must_raw_no_source;
- isl_union_map *x_may_raw_no_source;
- isl_union_map *x_must_war;
- isl_union_map *x_may_war;
- isl_union_map *x_must_war_no_source;
- isl_union_map *x_may_war_no_source;
- isl_union_map *x_must_waw;
- isl_union_map *x_may_waw;
- isl_union_map *x_must_waw_no_source;
- isl_union_map *x_may_waw_no_source;
-
- FOR_EACH_VEC_ELT (PBB_DRS (pbb), j, pdr)
- if (pdr_read_p (pdr))
- r = isl_union_map_add_map (r, add_pdr_constraints (pdr, pbb));
-
- FOR_EACH_VEC_ELT (PBB_DRS (pbb), j, pdr)
- if (pdr_write_p (pdr))
- must_w = isl_union_map_add_map (must_w,
- add_pdr_constraints (pdr, pbb));
-
- FOR_EACH_VEC_ELT (PBB_DRS (pbb), j, pdr)
- if (pdr_may_write_p (pdr))
- may_w = isl_union_map_add_map (may_w,
- add_pdr_constraints (pdr, pbb));
-
- all_w = isl_union_map_union
- (isl_union_map_copy (must_w), isl_union_map_copy (may_w));
- empty = isl_union_map_empty (isl_union_map_get_space (all_w));
-
- res = isl_union_map_compute_flow (isl_union_map_copy (r),
- isl_union_map_copy (must_w),
- isl_union_map_copy (may_w),
- isl_union_map_copy (original),
- &x_must_raw, &x_may_raw,
- &x_must_raw_no_source,
- &x_may_raw_no_source);
- gcc_assert (res == 0);
- res = isl_union_map_compute_flow (isl_union_map_copy (all_w),
- r, empty,
- isl_union_map_copy (original),
- &x_must_war, &x_may_war,
- &x_must_war_no_source,
- &x_may_war_no_source);
- gcc_assert (res == 0);
- res = isl_union_map_compute_flow (all_w, must_w, may_w,
- isl_union_map_copy (original),
- &x_must_waw, &x_may_waw,
- &x_must_waw_no_source,
- &x_may_waw_no_source);
- gcc_assert (res == 0);
-
- *must_raw = isl_union_map_subtract (*must_raw, x_must_raw);
- *may_raw = isl_union_map_subtract (*may_raw, x_may_raw);
- *must_raw_no_source = isl_union_map_subtract (*must_raw_no_source,
- x_must_raw_no_source);
- *may_raw_no_source = isl_union_map_subtract (*may_raw_no_source,
- x_may_raw_no_source);
- *must_war = isl_union_map_subtract (*must_war, x_must_war);
- *may_war = isl_union_map_subtract (*may_war, x_may_war);
- *must_war_no_source = isl_union_map_subtract (*must_war_no_source,
- x_must_war_no_source);
- *may_war_no_source = isl_union_map_subtract (*may_war_no_source,
- x_may_war_no_source);
- *must_waw = isl_union_map_subtract (*must_waw, x_must_waw);
- *may_waw = isl_union_map_subtract (*may_waw, x_may_waw);
- *must_waw_no_source = isl_union_map_subtract (*must_waw_no_source,
- x_must_waw_no_source);
- *may_waw_no_source = isl_union_map_subtract (*may_waw_no_source,
- x_may_waw_no_source);
- }
-
- isl_union_map_free (original);
- isl_space_free (space);
-}
-
/* Compute the original data dependences in SCOP for all the reads and
writes in PBBS. */
-void
+static void
compute_deps (scop_p scop, vec<poly_bb_p> pbbs,
isl_union_map **must_raw,
isl_union_map **may_raw,
isl_space *space = isl_union_map_get_space (all_writes);
isl_union_map *empty = isl_union_map_empty (space);
isl_union_map *original = scop_get_original_schedule (scop, pbbs);
- int res;
-
- res = isl_union_map_compute_flow (isl_union_map_copy (reads),
- isl_union_map_copy (must_writes),
- isl_union_map_copy (may_writes),
- isl_union_map_copy (original),
- must_raw, may_raw, must_raw_no_source,
- may_raw_no_source);
- gcc_assert (res == 0);
- res = isl_union_map_compute_flow (isl_union_map_copy (all_writes),
- reads, empty,
- isl_union_map_copy (original),
- must_war, may_war, must_war_no_source,
- may_war_no_source);
- gcc_assert (res == 0);
- res = isl_union_map_compute_flow (all_writes, must_writes, may_writes,
- isl_union_map_copy (original),
- must_waw, may_waw, must_waw_no_source,
- may_waw_no_source);
- gcc_assert (res == 0);
-
- subtract_commutative_associative_deps
- (scop, pbbs, original,
- must_raw, may_raw, must_raw_no_source, may_raw_no_source,
- must_war, may_war, must_war_no_source, may_war_no_source,
- must_waw, may_waw, must_waw_no_source, may_waw_no_source);
-}
-
-/* Given a TRANSFORM, check whether it respects the original
- dependences in SCOP. Returns true when TRANSFORM is a safe
- transformation. */
-
-static bool
-transform_is_safe (scop_p scop, isl_union_map *transform)
-{
- bool res;
- if (!scop->must_raw)
- compute_deps (scop, SCOP_BBS (scop),
- &scop->must_raw, &scop->may_raw,
- &scop->must_raw_no_source, &scop->may_raw_no_source,
- &scop->must_war, &scop->may_war,
- &scop->must_war_no_source, &scop->may_war_no_source,
- &scop->must_waw, &scop->may_waw,
- &scop->must_waw_no_source, &scop->may_waw_no_source);
-
- res = (no_violations (transform, scop->must_raw)
- && no_violations (transform, scop->may_raw)
- && no_violations (transform, scop->must_war)
- && no_violations (transform, scop->may_war)
- && no_violations (transform, scop->must_waw)
- && no_violations (transform, scop->may_waw));
-
- isl_union_map_free (transform);
- return res;
-}
-
-/* Return true when the SCOP transformed schedule is correct. */
-
-bool
-graphite_legal_transform (scop_p scop)
-{
- int res;
- isl_union_map *transform;
-
- timevar_push (TV_GRAPHITE_DATA_DEPS);
- transform = scop_get_transformed_schedule (scop, SCOP_BBS (scop));
- res = transform_is_safe (scop, transform);
- timevar_pop (TV_GRAPHITE_DATA_DEPS);
-
- return res;
-}
-
-/* Return true when the loop at DEPTH carries dependences. BODY is
- the body of the loop. */
+ if (dump_file)
+ {
+ fprintf (dump_file, "\n--- Documentation for datarefs dump: ---\n");
+ fprintf (dump_file, "Statements on the iteration domain are mapped to"
+ " array references.\n");
+ fprintf (dump_file, " To read the following data references:\n\n");
+ fprintf (dump_file, " S_5[i0] -> [106] : i0 >= 0 and i0 <= 3\n");
+ fprintf (dump_file, " S_8[i0] -> [1, i0] : i0 >= 0 and i0 <= 3\n\n");
+
+ fprintf (dump_file, " S_5[i0] is the dynamic instance of statement"
+ " bb_5 in a loop that accesses all iterations 0 <= i0 <= 3.\n");
+ fprintf (dump_file, " [1, i0] is a 'memref' with alias set 1"
+ " and first subscript access i0.\n");
+ fprintf (dump_file, " [106] is a 'scalar reference' which is the sum of"
+ " SSA_NAME_VERSION 6"
+ " and --param graphite-max-arrays-per-scop=100\n");
+ fprintf (dump_file, "-----------------------\n\n");
+
+ fprintf (dump_file, "data references (\n");
+ fprintf (dump_file, " reads: ");
+ print_isl_union_map (dump_file, reads);
+ fprintf (dump_file, " must_writes: ");
+ print_isl_union_map (dump_file, must_writes);
+ fprintf (dump_file, " may_writes: ");
+ print_isl_union_map (dump_file, may_writes);
+ fprintf (dump_file, " all_writes: ");
+ print_isl_union_map (dump_file, all_writes);
+ fprintf (dump_file, ")\n");
+ }
-static bool
-loop_level_carries_dependences (scop_p scop, vec<poly_bb_p> body,
- int depth)
-{
- isl_union_map *transform = scop_get_transformed_schedule (scop, body);
- isl_union_map *must_raw, *may_raw;
- isl_union_map *must_war, *may_war;
- isl_union_map *must_waw, *may_waw;
- int res;
-
- compute_deps (scop, body,
- &must_raw, &may_raw, NULL, NULL,
- &must_war, &may_war, NULL, NULL,
- &must_waw, &may_waw, NULL, NULL);
-
- res = (carries_deps (transform, must_raw, depth)
- || carries_deps (transform, may_raw, depth)
- || carries_deps (transform, must_war, depth)
- || carries_deps (transform, may_war, depth)
- || carries_deps (transform, must_waw, depth)
- || carries_deps (transform, may_waw, depth));
-
- isl_union_map_free (transform);
- isl_union_map_free (must_raw);
- isl_union_map_free (may_raw);
- isl_union_map_free (must_war);
- isl_union_map_free (may_war);
- isl_union_map_free (must_waw);
- isl_union_map_free (may_waw);
- return res;
+ isl_union_map_compute_flow (isl_union_map_copy (reads),
+ isl_union_map_copy (must_writes),
+ isl_union_map_copy (may_writes),
+ isl_union_map_copy (original),
+ must_raw, may_raw, must_raw_no_source,
+ may_raw_no_source);
+ isl_union_map_compute_flow (isl_union_map_copy (all_writes),
+ reads, empty,
+ isl_union_map_copy (original),
+ must_war, may_war, must_war_no_source,
+ may_war_no_source);
+ isl_union_map_compute_flow (all_writes, must_writes, may_writes,
+ original,
+ must_waw, may_waw, must_waw_no_source,
+ may_waw_no_source);
}
-/* Returns true when the loop L at level DEPTH is parallel.
- BB_PBB_MAPPING is a map between a basic_block and its related
- poly_bb_p. */
-
-bool
-loop_is_parallel_p (loop_p loop, bb_pbb_htab_type bb_pbb_mapping, int depth)
+isl_union_map *
+scop_get_dependences (scop_p scop)
{
- bool dependences;
- scop_p scop;
+ if (scop->dependence)
+ return scop->dependence;
+
+ /* The original dependence relations:
+ RAW are read after write dependences,
+ WAR are write after read dependences,
+ WAW are write after write dependences. */
+ isl_union_map *must_raw = NULL, *may_raw = NULL, *must_raw_no_source = NULL,
+ *may_raw_no_source = NULL, *must_war = NULL, *may_war = NULL,
+ *must_war_no_source = NULL, *may_war_no_source = NULL, *must_waw = NULL,
+ *may_waw = NULL, *must_waw_no_source = NULL, *may_waw_no_source = NULL;
+
+ compute_deps (scop, scop->pbbs,
+ &must_raw, &may_raw,
+ &must_raw_no_source, &may_raw_no_source,
+ &must_war, &may_war,
+ &must_war_no_source, &may_war_no_source,
+ &must_waw, &may_waw,
+ &must_waw_no_source, &may_waw_no_source);
+
+ isl_union_map *dependences = must_raw;
+ dependences = isl_union_map_union (dependences, must_war);
+ dependences = isl_union_map_union (dependences, must_waw);
+ dependences = isl_union_map_union (dependences, may_raw);
+ dependences = isl_union_map_union (dependences, may_war);
+ dependences = isl_union_map_union (dependences, may_waw);
+
+ if (dump_file)
+ {
+ fprintf (dump_file, "data dependences (\n");
+ print_isl_union_map (dump_file, dependences);
+ fprintf (dump_file, ")\n");
+ }
- timevar_push (TV_GRAPHITE_DATA_DEPS);
- stack_vec<poly_bb_p, 3> body;
- scop = get_loop_body_pbbs (loop, bb_pbb_mapping, &body);
- dependences = loop_level_carries_dependences (scop, body, depth);
- timevar_pop (TV_GRAPHITE_DATA_DEPS);
+ isl_union_map_free (must_raw_no_source);
+ isl_union_map_free (may_raw_no_source);
+ isl_union_map_free (must_war_no_source);
+ isl_union_map_free (may_war_no_source);
+ isl_union_map_free (must_waw_no_source);
+ isl_union_map_free (may_waw_no_source);
- return !dependences;
+ scop->dependence = dependences;
+ return dependences;
}
-#endif
+#endif /* HAVE_isl */
projects / gcc.git / blobdiff