Mercurial > hg > CbC > CbC_gcc
diff gcc/graphite-dependences.c @ 111:04ced10e8804
gcc 7
author | kono |
---|---|
date | Fri, 27 Oct 2017 22:46:09 +0900 |
parents | f6334be47118 |
children | 84e7813d76e9 |
line wrap: on
line diff
--- a/gcc/graphite-dependences.c Sun Aug 21 07:07:55 2011 +0900 +++ b/gcc/graphite-dependences.c Fri Oct 27 22:46:09 2017 +0900 @@ -1,5 +1,5 @@ /* Data dependence analysis for Graphite. - Copyright (C) 2009, 2010 Free Software Foundation, Inc. + Copyright (C) 2009-2017 Free Software Foundation, Inc. Contributed by Sebastian Pop <sebastian.pop@amd.com> and Konrad Trifunovic <konrad.trifunovic@inria.fr>. @@ -19,916 +19,324 @@ along with GCC; see the file COPYING3. If not see <http://www.gnu.org/licenses/>. */ +#define USES_ISL + #include "config.h" + +#ifdef HAVE_isl + #include "system.h" #include "coretypes.h" -#include "tree-flow.h" -#include "tree-dump.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" +#include "graphite.h" -#ifdef HAVE_cloog -#include "ppl_c.h" -#include "graphite-ppl.h" -#include "graphite-poly.h" -#include "graphite-dependences.h" -#include "graphite-cloog-util.h" - -/* Comparison function for poly_ddr hash table. */ +/* Add the constraints from the set S to the domain of MAP. */ -int -eq_poly_ddr_p (const void *pddr1, const void *pddr2) +static isl_map * +constrain_domain (isl_map *map, isl_set *s) { - const struct poly_ddr *p1 = (const struct poly_ddr *) pddr1; - const struct poly_ddr *p2 = (const struct poly_ddr *) pddr2; + isl_space *d = isl_map_get_space (map); + isl_id *id = isl_space_get_tuple_id (d, isl_dim_in); - return (PDDR_SOURCE (p1) == PDDR_SOURCE (p2) - && PDDR_SINK (p1) == PDDR_SINK (p2)); + s = isl_set_set_tuple_id (s, id); + isl_space_free (d); + return isl_map_coalesce (isl_map_intersect_domain (map, s)); } -/* Hash function for poly_ddr hashtable. */ +/* Constrain pdr->accesses with pdr->subscript_sizes and pbb->domain. */ -hashval_t -hash_poly_ddr_p (const void *pddr) +static isl_map * +add_pdr_constraints (poly_dr_p pdr, poly_bb_p pbb) { - const struct poly_ddr *p = (const struct poly_ddr *) pddr; - - return (hashval_t) ((long) PDDR_SOURCE (p) + (long) PDDR_SINK (p)); + isl_map *x = isl_map_intersect_range (isl_map_copy (pdr->accesses), + isl_set_copy (pdr->subscript_sizes)); + x = isl_map_coalesce (x); + return constrain_domain (x, isl_set_copy (pbb->domain)); } -/* Returns true when PDDR has no dependence. */ - -static bool -pddr_is_empty (poly_ddr_p pddr) -{ - if (!pddr) - return true; - - gcc_assert (PDDR_KIND (pddr) != unknown_dependence); - - return PDDR_KIND (pddr) == no_dependence ? true : false; -} - -/* Prints to FILE the layout of the dependence polyhedron of PDDR: - - T1|I1|T2|I2|S1|S2|G - - with - | T1 and T2 the scattering dimensions for PDDR_SOURCE and PDDR_SINK - | I1 and I2 the iteration domains - | S1 and S2 the subscripts - | G the global parameters. */ +/* Returns an isl description of all memory operations in SCOP. The memory + reads are returned in READS and writes in MUST_WRITES and MAY_WRITES. */ static void -print_dependence_polyhedron_layout (FILE *file, poly_ddr_p pddr) +scop_get_reads_and_writes (scop_p scop, isl_union_map *&reads, + isl_union_map *&must_writes, + isl_union_map *&may_writes) { - poly_dr_p pdr1 = PDDR_SOURCE (pddr); - poly_dr_p pdr2 = PDDR_SINK (pddr); - poly_bb_p pbb1 = PDR_PBB (pdr1); - poly_bb_p pbb2 = PDR_PBB (pdr2); - - graphite_dim_t i; - graphite_dim_t tdim1 = PDDR_ORIGINAL_SCATTERING_P (pddr) ? - pbb_nb_scattering_orig (pbb1) : pbb_nb_scattering_transform (pbb1); - graphite_dim_t tdim2 = PDDR_ORIGINAL_SCATTERING_P (pddr) ? - pbb_nb_scattering_orig (pbb2) : pbb_nb_scattering_transform (pbb2); - graphite_dim_t idim1 = pbb_dim_iter_domain (pbb1); - graphite_dim_t idim2 = pbb_dim_iter_domain (pbb2); - graphite_dim_t sdim1 = PDR_NB_SUBSCRIPTS (pdr1) + 1; - graphite_dim_t sdim2 = PDR_NB_SUBSCRIPTS (pdr2) + 1; - graphite_dim_t gdim = scop_nb_params (PBB_SCOP (pbb1)); - - fprintf (file, "# eq"); - - for (i = 0; i < tdim1; i++) - fprintf (file, " t1_%d", (int) i); - for (i = 0; i < idim1; i++) - fprintf (file, " i1_%d", (int) i); - for (i = 0; i < tdim2; i++) - fprintf (file, " t2_%d", (int) i); - for (i = 0; i < idim2; i++) - fprintf (file, " i2_%d", (int) i); - for (i = 0; i < sdim1; i++) - fprintf (file, " s1_%d", (int) i); - for (i = 0; i < sdim2; i++) - fprintf (file, " s2_%d", (int) i); - for (i = 0; i < gdim; i++) - fprintf (file, " g_%d", (int) i); - - fprintf (file, " cst\n"); -} - -/* Prints to FILE the poly_ddr_p PDDR. */ - -void -print_pddr (FILE *file, poly_ddr_p pddr) -{ - fprintf (file, "pddr (kind: "); - - if (PDDR_KIND (pddr) == unknown_dependence) - fprintf (file, "unknown_dependence"); - else if (PDDR_KIND (pddr) == no_dependence) - fprintf (file, "no_dependence"); - else if (PDDR_KIND (pddr) == has_dependence) - fprintf (file, "has_dependence"); + int i, j; + poly_bb_p pbb; + poly_dr_p pdr; - fprintf (file, "\n source "); - print_pdr (file, PDDR_SOURCE (pddr), 2); - - fprintf (file, "\n sink "); - print_pdr (file, PDDR_SINK (pddr), 2); - - if (PDDR_KIND (pddr) == has_dependence) + FOR_EACH_VEC_ELT (scop->pbbs, i, pbb) { - fprintf (file, "\n dependence polyhedron (\n"); - print_dependence_polyhedron_layout (file, pddr); - ppl_print_powerset_matrix (file, PDDR_DDP (pddr)); - ppl_io_fprint_Pointset_Powerset_C_Polyhedron (file, PDDR_DDP (pddr)); - fprintf (file, ")\n"); + FOR_EACH_VEC_ELT (PBB_DRS (pbb), j, pdr) { + if (pdr_read_p (pdr)) + { + if (dump_file) + { + fprintf (dump_file, "Adding read to depedence graph: "); + print_pdr (dump_file, pdr); + } + isl_union_map *um + = isl_union_map_from_map (add_pdr_constraints (pdr, pbb)); + reads = isl_union_map_union (reads, um); + if (dump_file) + { + fprintf (dump_file, "Reads depedence graph: "); + print_isl_union_map (dump_file, reads); + } + } + else if (pdr_write_p (pdr)) + { + if (dump_file) + { + fprintf (dump_file, "Adding must write to depedence graph: "); + print_pdr (dump_file, pdr); + } + isl_union_map *um + = isl_union_map_from_map (add_pdr_constraints (pdr, pbb)); + must_writes = isl_union_map_union (must_writes, um); + if (dump_file) + { + fprintf (dump_file, "Must writes depedence graph: "); + print_isl_union_map (dump_file, must_writes); + } + } + else if (pdr_may_write_p (pdr)) + { + if (dump_file) + { + fprintf (dump_file, "Adding may write to depedence graph: "); + print_pdr (dump_file, pdr); + } + isl_union_map *um + = isl_union_map_from_map (add_pdr_constraints (pdr, pbb)); + may_writes = isl_union_map_union (may_writes, um); + if (dump_file) + { + fprintf (dump_file, "May writes depedence graph: "); + print_isl_union_map (dump_file, may_writes); + } + } + } } - - fprintf (file, ")\n"); -} - -/* Prints to STDERR the poly_ddr_p PDDR. */ - -DEBUG_FUNCTION void -debug_pddr (poly_ddr_p pddr) -{ - print_pddr (stderr, pddr); -} - - -/* Remove all the dimensions except alias information at dimension - ALIAS_DIM. */ - -static void -build_alias_set_powerset (ppl_Pointset_Powerset_C_Polyhedron_t alias_powerset, - ppl_dimension_type alias_dim) -{ - ppl_dimension_type *ds; - ppl_dimension_type access_dim; - unsigned i, pos = 0; - - ppl_Pointset_Powerset_C_Polyhedron_space_dimension (alias_powerset, - &access_dim); - ds = XNEWVEC (ppl_dimension_type, access_dim-1); - for (i = 0; i < access_dim; i++) - { - if (i == alias_dim) - continue; - - ds[pos] = i; - pos++; - } - - ppl_Pointset_Powerset_C_Polyhedron_remove_space_dimensions (alias_powerset, - ds, - access_dim - 1); - free (ds); } -/* Return true when PDR1 and PDR2 may alias. */ - -static bool -poly_drs_may_alias_p (poly_dr_p pdr1, poly_dr_p pdr2) -{ - ppl_Pointset_Powerset_C_Polyhedron_t alias_powerset1, alias_powerset2; - ppl_Pointset_Powerset_C_Polyhedron_t accesses1 = PDR_ACCESSES (pdr1); - ppl_Pointset_Powerset_C_Polyhedron_t accesses2 = PDR_ACCESSES (pdr2); - ppl_dimension_type alias_dim1 = pdr_alias_set_dim (pdr1); - ppl_dimension_type alias_dim2 = pdr_alias_set_dim (pdr2); - int empty_p; +/* Helper function used on each MAP of a isl_union_map. Computes the + maximal output dimension. */ - ppl_new_Pointset_Powerset_C_Polyhedron_from_Pointset_Powerset_C_Polyhedron - (&alias_powerset1, accesses1); - ppl_new_Pointset_Powerset_C_Polyhedron_from_Pointset_Powerset_C_Polyhedron - (&alias_powerset2, accesses2); - - build_alias_set_powerset (alias_powerset1, alias_dim1); - build_alias_set_powerset (alias_powerset2, alias_dim2); +static isl_stat +max_number_of_out_dimensions (__isl_take isl_map *map, void *user) +{ + int global_max = *((int *) user); + isl_space *space = isl_map_get_space (map); + int nb_out = isl_space_dim (space, isl_dim_out); - ppl_Pointset_Powerset_C_Polyhedron_intersection_assign - (alias_powerset1, alias_powerset2); - - empty_p = ppl_Pointset_Powerset_C_Polyhedron_is_empty (alias_powerset1); + if (global_max < nb_out) + *((int *) user) = nb_out; - ppl_delete_Pointset_Powerset_C_Polyhedron (alias_powerset1); - ppl_delete_Pointset_Powerset_C_Polyhedron (alias_powerset2); - - return !empty_p; + isl_map_free (map); + isl_space_free (space); + return isl_stat_ok; } -/* Swap [cut0, ..., cut1] to the end of DR: "a CUT0 b CUT1 c" is - transformed into "a CUT0 c CUT1' b" - - Add NB0 zeros before "a": "00...0 a CUT0 c CUT1' b" - Add NB1 zeros between "a" and "c": "00...0 a 00...0 c CUT1' b" - Add DIM - NB0 - NB1 - PDIM zeros between "c" and "b": - "00...0 a 00...0 c 00...0 b". */ - -static ppl_Pointset_Powerset_C_Polyhedron_t -map_dr_into_dep_poly (graphite_dim_t dim, - ppl_Pointset_Powerset_C_Polyhedron_t dr, - graphite_dim_t cut0, graphite_dim_t cut1, - graphite_dim_t nb0, graphite_dim_t nb1) -{ - ppl_dimension_type pdim; - ppl_dimension_type *map; - ppl_Pointset_Powerset_C_Polyhedron_t res; - ppl_dimension_type i; - - ppl_new_Pointset_Powerset_C_Polyhedron_from_Pointset_Powerset_C_Polyhedron - (&res, dr); - ppl_Pointset_Powerset_C_Polyhedron_space_dimension (res, &pdim); +/* Extends the output dimension of MAP to MAX dimensions. */ - map = (ppl_dimension_type *) XNEWVEC (ppl_dimension_type, pdim); - - /* First mapping: move 'g' vector to right position. */ - for (i = 0; i < cut0; i++) - map[i] = i; - - for (i = cut0; i < cut1; i++) - map[i] = pdim - cut1 + i; - - for (i = cut1; i < pdim; i++) - map[i] = cut0 + i - cut1; +static __isl_give isl_map * +extend_map (__isl_take isl_map *map, int max) +{ + isl_space *space = isl_map_get_space (map); + int n = isl_space_dim (space, isl_dim_out); - ppl_Pointset_Powerset_C_Polyhedron_map_space_dimensions (res, map, pdim); - free (map); - - /* After swapping 's' and 'g' vectors, we have to update a new cut. */ - cut1 = pdim - cut1 + cut0; - - ppl_insert_dimensions_pointset (res, 0, nb0); - ppl_insert_dimensions_pointset (res, nb0 + cut0, nb1); - ppl_insert_dimensions_pointset (res, nb0 + nb1 + cut1, - dim - nb0 - nb1 - pdim); - - return res; + isl_space_free (space); + return isl_map_add_dims (map, isl_dim_out, max - n); } -/* Builds subscript equality constraints. */ +/* Structure used to pass parameters to extend_schedule_1. */ -static ppl_Pointset_Powerset_C_Polyhedron_t -dr_equality_constraints (graphite_dim_t dim, - graphite_dim_t pos, graphite_dim_t nb_subscripts) -{ - ppl_Polyhedron_t eqs; - ppl_Pointset_Powerset_C_Polyhedron_t res; - graphite_dim_t i; - - ppl_new_C_Polyhedron_from_space_dimension (&eqs, dim, 0); +struct extend_schedule_str { + int max; + isl_union_map *umap; +}; - for (i = 0; i < nb_subscripts; i++) - { - ppl_Constraint_t cstr - = ppl_build_relation (dim, pos + i, pos + i + nb_subscripts, - 0, PPL_CONSTRAINT_TYPE_EQUAL); - ppl_Polyhedron_add_constraint (eqs, cstr); - ppl_delete_Constraint (cstr); - } +/* Helper function for extend_schedule. */ - ppl_new_Pointset_Powerset_C_Polyhedron_from_C_Polyhedron (&res, eqs); - ppl_delete_Polyhedron (eqs); - return res; +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 isl_stat_ok; } -/* Builds scheduling inequality constraints: when DIRECTION is - 1 builds a GE constraint, - 0 builds an EQ constraint, - -1 builds a LE constraint. - DIM is the dimension of the scheduling space. - POS and POS + OFFSET are the dimensions that are related. */ +/* Return a relation that has uniform output dimensions. */ + +static __isl_give isl_union_map * +extend_schedule (__isl_take isl_union_map *x) +{ + int max = 0; + struct extend_schedule_str str; -static ppl_Pointset_Powerset_C_Polyhedron_t -build_pairwise_scheduling (graphite_dim_t dim, - graphite_dim_t pos, - graphite_dim_t offset, - int direction) -{ - ppl_Pointset_Powerset_C_Polyhedron_t res; - ppl_Polyhedron_t equalities; - ppl_Constraint_t cstr; - graphite_dim_t a = pos; - graphite_dim_t b = pos + offset; - - ppl_new_C_Polyhedron_from_space_dimension (&equalities, dim, 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)); + isl_union_map_foreach_map (x, extend_schedule_1, (void *) &str); + isl_union_map_free (x); + return isl_union_map_coalesce (str.umap); +} - switch (direction) - { - case 1: - /* Builds "a + 1 <= b. */ - cstr = ppl_build_relation (dim, a, b, 1, - PPL_CONSTRAINT_TYPE_LESS_OR_EQUAL); - break; - - case 0: - /* Builds "a = b. */ - cstr = ppl_build_relation (dim, a, b, 0, - PPL_CONSTRAINT_TYPE_EQUAL); - break; +/* Applies SCHEDULE to the in and out dimensions of the dependences + DEPS and return the resulting relation. */ - case -1: - /* Builds "a >= b + 1. */ - cstr = ppl_build_relation (dim, a, b, -1, - PPL_CONSTRAINT_TYPE_GREATER_OR_EQUAL); - break; +static isl_map * +apply_schedule_on_deps (__isl_keep isl_union_map *schedule, + __isl_keep isl_union_map *deps) +{ + isl_union_map *trans = extend_schedule (isl_union_map_copy (schedule)); + isl_union_map *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); + ux = isl_union_map_coalesce (ux); - default: - gcc_unreachable (); - } + if (!isl_union_map_is_empty (ux)) + return isl_map_from_union_map (ux); - ppl_Polyhedron_add_constraint (equalities, cstr); - ppl_delete_Constraint (cstr); - - ppl_new_Pointset_Powerset_C_Polyhedron_from_C_Polyhedron (&res, equalities); - ppl_delete_Polyhedron (equalities); - return res; + isl_union_map_free (ux); + return NULL; } -/* Add to a non empty polyhedron BAG the precedence constraints for - the lexicographical comparison of time vectors in BAG following the - lexicographical order. DIM is the dimension of the polyhedron BAG. - TDIM is the number of loops common to the two statements that are - compared lexicographically, i.e. the number of loops containing - both statements. OFFSET is the number of dimensions needed to - represent the first statement, i.e. dimT1 + dimI1 in the layout of - the BAG polyhedron: T1|I1|T2|I2|S1|S2|G. When DIRECTION is set to - 1, compute the direct dependence from PDR1 to PDR2, and when - DIRECTION is -1, compute the reversed dependence relation, from - PDR2 to PDR1. */ +/* 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 ppl_Pointset_Powerset_C_Polyhedron_t -build_lexicographical_constraint (ppl_Pointset_Powerset_C_Polyhedron_t bag, - graphite_dim_t dim, - graphite_dim_t tdim, - graphite_dim_t offset, - int direction) +bool +carries_deps (__isl_keep isl_union_map *schedule, + __isl_keep isl_union_map *deps, + int depth) { - graphite_dim_t i; - ppl_Pointset_Powerset_C_Polyhedron_t res, lex; + if (isl_union_map_is_empty (deps)) + return false; - ppl_new_Pointset_Powerset_C_Polyhedron_from_space_dimension (&res, dim, 1); + isl_map *x = apply_schedule_on_deps (schedule, deps); + if (x == NULL) + return false; - lex = build_pairwise_scheduling (dim, 0, offset, direction); - ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (lex, bag); - - if (!ppl_powerset_is_empty (lex)) - ppl_Pointset_Powerset_C_Polyhedron_upper_bound_assign (res, lex); + isl_space *space = isl_map_get_space (x); + isl_map *lex = isl_map_lex_le (isl_space_range (space)); + isl_constraint *ineq = isl_inequality_alloc + (isl_local_space_from_space (isl_map_get_space (x))); - ppl_delete_Pointset_Powerset_C_Polyhedron (lex); - - for (i = 0; i < tdim - 1; i++) - { - ppl_Pointset_Powerset_C_Polyhedron_t sceq; + for (int i = 0; i < depth - 1; i++) + lex = isl_map_equate (lex, isl_dim_in, i, isl_dim_out, i); - sceq = build_pairwise_scheduling (dim, i, offset, 0); - ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (bag, sceq); - ppl_delete_Pointset_Powerset_C_Polyhedron (sceq); - - if (ppl_powerset_is_empty (bag)) - break; + /* in + 1 <= out */ + ineq = isl_constraint_set_coefficient_si (ineq, isl_dim_out, depth - 1, 1); + ineq = isl_constraint_set_coefficient_si (ineq, isl_dim_in, depth - 1, -1); + ineq = isl_constraint_set_constant_si (ineq, -1); + lex = isl_map_add_constraint (lex, ineq); + lex = isl_map_coalesce (lex); + x = isl_map_intersect (x, lex); + bool res = !isl_map_is_empty (x); - lex = build_pairwise_scheduling (dim, i + 1, offset, direction); - ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (lex, bag); - - if (!ppl_powerset_is_empty (lex)) - ppl_Pointset_Powerset_C_Polyhedron_upper_bound_assign (res, lex); - - ppl_delete_Pointset_Powerset_C_Polyhedron (lex); - } - + isl_map_free (x); return res; } -/* Build the dependence polyhedron for data references PDR1 and PDR2. - The layout of the dependence polyhedron is: - - T1|I1|T2|I2|S1|S2|G - - with - | T1 and T2 the scattering dimensions for PDR1 and PDR2 - | I1 and I2 the iteration domains - | S1 and S2 the subscripts - | G the global parameters. - - When DIRECTION is set to 1, compute the direct dependence from PDR1 - to PDR2, and when DIRECTION is -1, compute the reversed dependence - relation, from PDR2 to PDR1. */ - -static ppl_Pointset_Powerset_C_Polyhedron_t -dependence_polyhedron (poly_dr_p pdr1, poly_dr_p pdr2, - int direction, bool original_scattering_p) -{ - poly_bb_p pbb1 = PDR_PBB (pdr1); - poly_bb_p pbb2 = PDR_PBB (pdr2); - scop_p scop = PBB_SCOP (pbb1); - graphite_dim_t tdim1 = original_scattering_p ? - pbb_nb_scattering_orig (pbb1) : pbb_nb_scattering_transform (pbb1); - graphite_dim_t tdim2 = original_scattering_p ? - pbb_nb_scattering_orig (pbb2) : pbb_nb_scattering_transform (pbb2); - graphite_dim_t ddim1 = pbb_dim_iter_domain (pbb1); - graphite_dim_t ddim2 = pbb_dim_iter_domain (pbb2); - graphite_dim_t sdim1 = PDR_NB_SUBSCRIPTS (pdr1) + 1; - graphite_dim_t sdim2 = PDR_NB_SUBSCRIPTS (pdr2) + 1; - graphite_dim_t gdim = scop_nb_params (scop); - graphite_dim_t dim1 = pdr_dim (pdr1); - graphite_dim_t dim2 = pdr_dim (pdr2); - graphite_dim_t dim = tdim1 + tdim2 + dim1 + dim2 - gdim; - ppl_Pointset_Powerset_C_Polyhedron_t res; - ppl_Pointset_Powerset_C_Polyhedron_t idr1, idr2; - ppl_Pointset_Powerset_C_Polyhedron_t sc1, sc2, dreq; - ppl_Pointset_Powerset_C_Polyhedron_t lex; - - gcc_assert (PBB_SCOP (pbb1) == PBB_SCOP (pbb2)); - - combine_context_id_scat (&sc1, pbb1, original_scattering_p); - combine_context_id_scat (&sc2, pbb2, original_scattering_p); - - ppl_insert_dimensions_pointset (sc1, tdim1 + ddim1, - tdim2 + ddim2 + sdim1 + sdim2); - - ppl_insert_dimensions_pointset (sc2, 0, tdim1 + ddim1); - ppl_insert_dimensions_pointset (sc2, tdim1 + ddim1 + tdim2 + ddim2, - sdim1 + sdim2); - - idr1 = map_dr_into_dep_poly (dim, PDR_ACCESSES (pdr1), ddim1, ddim1 + gdim, - tdim1, tdim2 + ddim2); - idr2 = map_dr_into_dep_poly (dim, PDR_ACCESSES (pdr2), ddim2, ddim2 + gdim, - tdim1 + ddim1 + tdim2, sdim1); - - /* Now add the subscript equalities. */ - dreq = dr_equality_constraints (dim, tdim1 + ddim1 + tdim2 + ddim2, sdim1); - - ppl_new_Pointset_Powerset_C_Polyhedron_from_space_dimension (&res, dim, 0); - ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (res, sc1); - ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (res, sc2); - ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (res, idr1); - ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (res, idr2); - ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (res, dreq); - ppl_delete_Pointset_Powerset_C_Polyhedron (sc1); - ppl_delete_Pointset_Powerset_C_Polyhedron (sc2); - ppl_delete_Pointset_Powerset_C_Polyhedron (idr1); - ppl_delete_Pointset_Powerset_C_Polyhedron (idr2); - ppl_delete_Pointset_Powerset_C_Polyhedron (dreq); - - if (ppl_powerset_is_empty (res)) - return NULL; - - lex = build_lexicographical_constraint (res, dim, MIN (tdim1, tdim2), - tdim1 + ddim1, direction); - ppl_delete_Pointset_Powerset_C_Polyhedron (res); - - return lex; -} - -/* Build the dependence polyhedron for data references PDR1 and PDR2. - If possible use already cached information. - - When DIRECTION is set to 1, compute the direct dependence from PDR1 - to PDR2, and when DIRECTION is -1, compute the reversed dependence - relation, from PDR2 to PDR1. */ - -static poly_ddr_p -new_poly_ddr (poly_dr_p pdr1, poly_dr_p pdr2, - int direction, bool original_scattering_p) -{ - PTR *x = NULL; - poly_ddr_p res; - bool may_alias; - - /* Return the PDDR from the cache if it already has been computed. */ - if (original_scattering_p) - { - struct poly_ddr tmp; - scop_p scop = PBB_SCOP (PDR_PBB (pdr1)); - - tmp.source = pdr1; - tmp.sink = pdr2; - x = htab_find_slot (SCOP_ORIGINAL_PDDRS (scop), - &tmp, INSERT); - - if (x && *x) - return (poly_ddr_p) *x; - } - - res = XNEW (struct poly_ddr); - PDDR_SOURCE (res) = pdr1; - PDDR_SINK (res) = pdr2; - PDDR_DDP (res) = NULL; - PDDR_ORIGINAL_SCATTERING_P (res) = original_scattering_p; - PDDR_KIND (res) = unknown_dependence; - - may_alias = poly_drs_may_alias_p (pdr1, pdr2); - - if (!(pdr_read_p (pdr1) && pdr_read_p (pdr2)) - && PDR_BASE_OBJECT_SET (pdr1) != PDR_BASE_OBJECT_SET (pdr2) - && may_alias) - PDDR_KIND (res) = unknown_dependence; - - else if (!(pdr_read_p (pdr1) && pdr_read_p (pdr2)) - && same_pdr_p (pdr1, pdr2) - && may_alias) - { - PDDR_DDP (res) = dependence_polyhedron (pdr1, pdr2, direction, - original_scattering_p); - if (PDDR_DDP (res)) - PDDR_KIND (res) = has_dependence; - else - PDDR_KIND (res) = no_dependence; - } - else - PDDR_KIND (res) = no_dependence; - - if (original_scattering_p) - *x = res; - - return res; -} - -/* Free the data dependence relation poly_ddr_p P. */ +/* Compute the dependence relations for the SCOP: + RAW are read after write dependences, + WAR are write after read dependences, + WAW are write after write dependences. */ void -free_poly_ddr (void *p) +scop_get_dependences (scop_p scop) { - poly_ddr_p pddr = (poly_ddr_p) p; - ppl_delete_Pointset_Powerset_C_Polyhedron (PDDR_DDP (pddr)); - free (pddr); -} - -/* Return true when the data dependence relation between the data - references PDR1 belonging to PBB1 and PDR2 is part of a - reduction. */ - -static inline bool -reduction_dr_1 (poly_bb_p pbb1, poly_dr_p pdr1, poly_dr_p pdr2) -{ - int i; - poly_dr_p pdr; - - FOR_EACH_VEC_ELT (poly_dr_p, PBB_DRS (pbb1), i, pdr) - if (PDR_TYPE (pdr) == PDR_WRITE - && same_pdr_p (pdr, pdr1) && same_pdr_p (pdr, pdr2)) - return true; + if (scop->dependence) + return; - return false; -} - -/* Return true when the data dependence relation between the data - references PDR1 belonging to PBB1 and PDR2 belonging to PBB2 is - part of a reduction. */ - -static inline bool -reduction_dr_p (poly_dr_p pdr1, poly_dr_p pdr2) -{ - poly_bb_p pbb1 = PDR_PBB (pdr1); - poly_bb_p pbb2 = PDR_PBB (pdr2); - - if (PBB_IS_REDUCTION (pbb1)) - return reduction_dr_1 (pbb1, pdr1, pdr2); - - if (PBB_IS_REDUCTION (pbb2)) - return reduction_dr_1 (pbb2, pdr2, pdr1); - - return false; -} + isl_space *space = isl_set_get_space (scop->param_context); + isl_union_map *reads = isl_union_map_empty (isl_space_copy (space)); + isl_union_map *must_writes = isl_union_map_empty (isl_space_copy (space)); + isl_union_map *may_writes = isl_union_map_empty (space); + scop_get_reads_and_writes (scop, reads, must_writes, may_writes); -/* Returns true when the PBB_TRANSFORMED_SCATTERING functions of PBB1 - and PBB2 respect the data dependences of PBB_ORIGINAL_SCATTERING - functions. */ - -static bool -graphite_legal_transform_dr (poly_dr_p pdr1, poly_dr_p pdr2) -{ - ppl_Pointset_Powerset_C_Polyhedron_t po, pt; - graphite_dim_t ddim1, otdim1, otdim2, ttdim1, ttdim2; - ppl_Pointset_Powerset_C_Polyhedron_t po_temp; - ppl_dimension_type pdim; - bool is_empty_p; - poly_ddr_p opddr, tpddr; - poly_bb_p pbb1, pbb2; - - if (reduction_dr_p (pdr1, pdr2)) - return true; + 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"); - /* We build the reverse dependence relation for the transformed - scattering, such that when we intersect it with the original PO, - we get an empty intersection when the transform is legal: - i.e. the transform should reverse no dependences, and so PT, the - reversed transformed PDDR, should have no constraint from PO. */ - opddr = new_poly_ddr (pdr1, pdr2, 1, true); - - if (PDDR_KIND (opddr) == unknown_dependence) - return false; + 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"); - /* There are no dependences between PDR1 and PDR2 in the original - version of the program, or after the transform, so the - transform is legal. */ - if (pddr_is_empty (opddr)) - return true; - - tpddr = new_poly_ddr (pdr1, pdr2, -1, false); - - if (PDDR_KIND (tpddr) == unknown_dependence) - { - free_poly_ddr (tpddr); - return false; - } - - if (pddr_is_empty (tpddr)) - { - free_poly_ddr (tpddr); - return true; + 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, ")\n"); } - po = PDDR_DDP (opddr); - pt = PDDR_DDP (tpddr); - - /* Copy PO into PO_TEMP, such that PO is not destroyed. PO is - stored in a cache and should not be modified or freed. */ - ppl_Pointset_Powerset_C_Polyhedron_space_dimension (po, &pdim); - ppl_new_Pointset_Powerset_C_Polyhedron_from_space_dimension (&po_temp, - pdim, 0); - ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (po_temp, po); - - /* Extend PO and PT to have the same dimensions. */ - pbb1 = PDR_PBB (pdr1); - pbb2 = PDR_PBB (pdr2); - ddim1 = pbb_dim_iter_domain (pbb1); - otdim1 = pbb_nb_scattering_orig (pbb1); - otdim2 = pbb_nb_scattering_orig (pbb2); - ttdim1 = pbb_nb_scattering_transform (pbb1); - ttdim2 = pbb_nb_scattering_transform (pbb2); - ppl_insert_dimensions_pointset (po_temp, otdim1, ttdim1); - ppl_insert_dimensions_pointset (po_temp, otdim1 + ttdim1 + ddim1 + otdim2, - ttdim2); - ppl_insert_dimensions_pointset (pt, 0, otdim1); - ppl_insert_dimensions_pointset (pt, otdim1 + ttdim1 + ddim1, otdim2); - - ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (po_temp, pt); - is_empty_p = ppl_powerset_is_empty (po_temp); + gcc_assert (scop->original_schedule); - ppl_delete_Pointset_Powerset_C_Polyhedron (po_temp); - free_poly_ddr (tpddr); - - if (dump_file && (dump_flags & TDF_DETAILS)) - fprintf (dump_file, "\nloop carries dependency.\n"); - - return is_empty_p; -} - -/* Return true when the data dependence relation for PBB1 and PBB2 is - part of a reduction. */ + isl_union_access_info *ai; + ai = isl_union_access_info_from_sink (isl_union_map_copy (reads)); + ai = isl_union_access_info_set_must_source (ai, isl_union_map_copy (must_writes)); + ai = isl_union_access_info_set_may_source (ai, may_writes); + ai = isl_union_access_info_set_schedule + (ai, isl_schedule_copy (scop->original_schedule)); + isl_union_flow *flow = isl_union_access_info_compute_flow (ai); + isl_union_map *raw = isl_union_flow_get_must_dependence (flow); + isl_union_flow_free (flow); -static inline bool -reduction_ddr_p (poly_bb_p pbb1, poly_bb_p pbb2) -{ - return pbb1 == pbb2 && PBB_IS_REDUCTION (pbb1); -} - -/* Iterates over the data references of PBB1 and PBB2 and detect - whether the transformed schedule is correct. */ - -static bool -graphite_legal_transform_bb (poly_bb_p pbb1, poly_bb_p pbb2) -{ - int i, j; - poly_dr_p pdr1, pdr2; - - if (!PBB_PDR_DUPLICATES_REMOVED (pbb1)) - pbb_remove_duplicate_pdrs (pbb1); + ai = isl_union_access_info_from_sink (isl_union_map_copy (must_writes)); + ai = isl_union_access_info_set_must_source (ai, must_writes); + ai = isl_union_access_info_set_may_source (ai, reads); + ai = isl_union_access_info_set_schedule + (ai, isl_schedule_copy (scop->original_schedule)); + flow = isl_union_access_info_compute_flow (ai); - if (!PBB_PDR_DUPLICATES_REMOVED (pbb2)) - pbb_remove_duplicate_pdrs (pbb2); - - if (reduction_ddr_p (pbb1, pbb2)) - return true; - - FOR_EACH_VEC_ELT (poly_dr_p, PBB_DRS (pbb1), i, pdr1) - FOR_EACH_VEC_ELT (poly_dr_p, PBB_DRS (pbb2), j, pdr2) - if (!graphite_legal_transform_dr (pdr1, pdr2)) - return false; + isl_union_map *waw = isl_union_flow_get_must_dependence (flow); + isl_union_map *war = isl_union_flow_get_may_dependence (flow); + war = isl_union_map_subtract (war, isl_union_map_copy (waw)); + isl_union_flow_free (flow); - return true; -} - -/* Iterates over the SCOP and detect whether the transformed schedule - is correct. */ - -bool -graphite_legal_transform (scop_p scop) -{ - int i, j; - poly_bb_p pbb1, pbb2; - - timevar_push (TV_GRAPHITE_DATA_DEPS); + raw = isl_union_map_coalesce (raw); + waw = isl_union_map_coalesce (waw); + war = isl_union_map_coalesce (war); - FOR_EACH_VEC_ELT (poly_bb_p, SCOP_BBS (scop), i, pbb1) - FOR_EACH_VEC_ELT (poly_bb_p, SCOP_BBS (scop), j, pbb2) - if (!graphite_legal_transform_bb (pbb1, pbb2)) - { - timevar_pop (TV_GRAPHITE_DATA_DEPS); - return false; - } - - timevar_pop (TV_GRAPHITE_DATA_DEPS); - return true; -} - -/* Returns TRUE when the dependence polyhedron between PDR1 and - PDR2 represents a loop carried dependence at level LEVEL. */ + isl_union_map *dependences = raw; + dependences = isl_union_map_union (dependences, war); + dependences = isl_union_map_union (dependences, waw); + dependences = isl_union_map_coalesce (dependences); -static bool -graphite_carried_dependence_level_k (poly_dr_p pdr1, poly_dr_p pdr2, - int level) -{ - ppl_Pointset_Powerset_C_Polyhedron_t po; - ppl_Pointset_Powerset_C_Polyhedron_t eqpp; - graphite_dim_t tdim1 = pbb_nb_scattering_transform (PDR_PBB (pdr1)); - graphite_dim_t ddim1 = pbb_dim_iter_domain (PDR_PBB (pdr1)); - ppl_dimension_type dim; - bool empty_p; - poly_ddr_p pddr = new_poly_ddr (pdr1, pdr2, 1, false); - - if (PDDR_KIND (pddr) == unknown_dependence) + if (dump_file) { - free_poly_ddr (pddr); - return true; + fprintf (dump_file, "data dependences (\n"); + print_isl_union_map (dump_file, dependences); + fprintf (dump_file, ")\n"); } - if (pddr_is_empty (pddr)) - { - free_poly_ddr (pddr); - return false; - } - - po = PDDR_DDP (pddr); - ppl_Pointset_Powerset_C_Polyhedron_space_dimension (po, &dim); - eqpp = build_pairwise_scheduling (dim, level, tdim1 + ddim1, 1); - - ppl_Pointset_Powerset_C_Polyhedron_intersection_assign (eqpp, po); - empty_p = ppl_powerset_is_empty (eqpp); - - ppl_delete_Pointset_Powerset_C_Polyhedron (eqpp); - free_poly_ddr (pddr); - - return !empty_p; + scop->dependence = dependences; } -/* Check data dependency between PBB1 and PBB2 at level LEVEL. */ - -bool -dependency_between_pbbs_p (poly_bb_p pbb1, poly_bb_p pbb2, int level) -{ - int i, j; - poly_dr_p pdr1, pdr2; - - timevar_push (TV_GRAPHITE_DATA_DEPS); - - FOR_EACH_VEC_ELT (poly_dr_p, PBB_DRS (pbb1), i, pdr1) - FOR_EACH_VEC_ELT (poly_dr_p, PBB_DRS (pbb2), j, pdr2) - if (graphite_carried_dependence_level_k (pdr1, pdr2, level)) - { - timevar_pop (TV_GRAPHITE_DATA_DEPS); - return true; - } - - timevar_pop (TV_GRAPHITE_DATA_DEPS); - return false; -} - -/* When ORIG is true, pretty print to FILE all the original data - dependences of SCoP in DOT format, otherwise print the transformed - data deps. */ - -static void -dot_deps_stmt_2 (FILE *file, scop_p scop, bool orig) -{ - int i, j, k, l; - poly_bb_p pbb1, pbb2; - poly_dr_p pdr1, pdr2; - - FOR_EACH_VEC_ELT (poly_bb_p, SCOP_BBS (scop), i, pbb1) - FOR_EACH_VEC_ELT (poly_bb_p, SCOP_BBS (scop), j, pbb2) - { - FOR_EACH_VEC_ELT (poly_dr_p, PBB_DRS (pbb1), k, pdr1) - FOR_EACH_VEC_ELT (poly_dr_p, PBB_DRS (pbb2), l, pdr2) - { - poly_ddr_p pddr = new_poly_ddr (pdr1, pdr2, 1, orig); - - if (!pddr_is_empty (pddr)) - { - fprintf (file, orig ? "OS%d -> OS%d\n" : "TS%d -> TS%d\n", - pbb_index (pbb1), pbb_index (pbb2)); - - free_poly_ddr (pddr); - goto done; - } - - free_poly_ddr (pddr); - } - done:; - } -} - -/* Pretty print to FILE all the data dependences of SCoP in DOT - format. */ - -static void -dot_deps_stmt_1 (FILE *file, scop_p scop) -{ - fputs ("digraph all {\n", file); - - dot_deps_stmt_2 (file, scop, true); - dot_deps_stmt_2 (file, scop, false); - - fputs ("}\n\n", file); -} - -/* When ORIG is true, pretty print to FILE all the original data - dependences of SCoP in DOT format, otherwise print the transformed - data deps. */ - -static void -dot_deps_2 (FILE *file, scop_p scop, bool orig) -{ - int i, j, k, l; - poly_bb_p pbb1, pbb2; - poly_dr_p pdr1, pdr2; - - FOR_EACH_VEC_ELT (poly_bb_p, SCOP_BBS (scop), i, pbb1) - FOR_EACH_VEC_ELT (poly_bb_p, SCOP_BBS (scop), j, pbb2) - FOR_EACH_VEC_ELT (poly_dr_p, PBB_DRS (pbb1), k, pdr1) - FOR_EACH_VEC_ELT (poly_dr_p, PBB_DRS (pbb2), l, pdr2) - { - poly_ddr_p pddr = new_poly_ddr (pdr1, pdr2, 1, orig); - - if (!pddr_is_empty (pddr)) - fprintf (file, orig - ? "OS%d_D%d -> OS%d_D%d\n" : "TS%d_D%d -> TS%d_D%d\n", - pbb_index (pbb1), PDR_ID (pdr1), - pbb_index (pbb2), PDR_ID (pdr2)); - - free_poly_ddr (pddr); - } -} - -/* Pretty print to FILE all the data dependences of SCoP in DOT - format. */ - -static void -dot_deps_1 (FILE *file, scop_p scop) -{ - fputs ("digraph all {\n", file); - - dot_deps_2 (file, scop, true); - dot_deps_2 (file, scop, false); - - fputs ("}\n\n", file); -} - -/* Display all the data dependences in SCoP using dotty. */ - -DEBUG_FUNCTION void -dot_deps (scop_p scop) -{ - /* When debugging, enable the following code. This cannot be used - in production compilers because it calls "system". */ -#if 0 - FILE *stream = fopen ("/tmp/scopdeps.dot", "w"); - gcc_assert (stream); - - dot_deps_1 (stream, scop); - fclose (stream); - - system ("dotty /tmp/scopdeps.dot &"); -#else - dot_deps_1 (stderr, scop); -#endif -} - -/* Display all the statement dependences in SCoP using dotty. */ - -DEBUG_FUNCTION void -dot_deps_stmt (scop_p scop) -{ - /* When debugging, enable the following code. This cannot be used - in production compilers because it calls "system". */ -#if 0 - FILE *stream = fopen ("/tmp/scopdeps.dot", "w"); - gcc_assert (stream); - - dot_deps_stmt_1 (stream, scop); - fclose (stream); - - system ("dotty /tmp/scopdeps.dot &"); -#else - dot_deps_stmt_1 (stderr, scop); -#endif -} - -#endif +#endif /* HAVE_isl */