gcc/graphite-isl-ast-to-gimple.c

   1 /* Translation of ISL AST to Gimple.
   2    Copyright (C) 2014 Free Software Foundation, Inc.
   3    Contributed by Roman Gareev <gareevroman@gmail.com>.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #include "config.h"
  22
  23 #include <isl/set.h>
  24 #include <isl/map.h>
  25 #include <isl/union_map.h>
  26 #include <isl/ast_build.h>
  27
  28 #include "system.h"
  29 #include "coretypes.h"
  30 #include "tree.h"
  31 #include "basic-block.h"
  32 #include "tree-ssa-alias.h"
  33 #include "internal-fn.h"
  34 #include "gimple-expr.h"
  35 #include "is-a.h"
  36 #include "gimple.h"
  37 #include "gimple-iterator.h"
  38 #include "tree-ssa-loop.h"
  39 #include "tree-pass.h"
  40 #include "cfgloop.h"
  41 #include "tree-data-ref.h"
  42 #include "sese.h"
  43
  44 #include "graphite-poly.h"
  45 #include "graphite-isl-ast-to-gimple.h"
  46
  47 /* This flag is set when an error occurred during the translation of
  48    ISL AST to Gimple.  */
  49
  50 static bool graphite_regenerate_error;
  51
  52 /* Prints NODE to FILE.  */
  53
  54 void
  55 print_isl_ast_node (FILE *file, __isl_keep isl_ast_node *node,
  56                     __isl_keep isl_ctx *ctx)
  57 {
  58   isl_printer *prn = isl_printer_to_file (ctx, file);
  59   prn = isl_printer_set_output_format (prn, ISL_FORMAT_C);
  60   prn = isl_printer_print_ast_node (prn, node);
  61   prn = isl_printer_print_str (prn, "\n");
  62   isl_printer_free (prn);
  63 }
  64
  65 /* Generates a build, which specifies the constraints on the parameters.  */
  66
  67 static isl_ast_build *
  68 generate_isl_context (scop_p scop)
  69 {
  70   isl_set *context_isl = isl_set_params (isl_set_copy (scop->context));
  71   return isl_ast_build_from_context (context_isl);
  72 }
  73
  74 /* Generates a schedule, which specifies an order used to
  75    visit elements in a domain.  */
  76
  77 static isl_union_map *
  78 generate_isl_schedule (scop_p scop)
  79 {
  80   int i;
  81   poly_bb_p pbb;
  82   isl_union_map *schedule_isl =
  83     isl_union_map_empty (isl_set_get_space (scop->context));
  84
  85   FOR_EACH_VEC_ELT (SCOP_BBS (scop), i, pbb)
  86     {
  87       /* Dead code elimination: when the domain of a PBB is empty,
  88          don't generate code for the PBB.  */
  89       if (isl_set_is_empty (pbb->domain))
  90         continue;
  91
  92       isl_map *bb_schedule = isl_map_copy (pbb->transformed);
  93       bb_schedule = isl_map_intersect_domain (bb_schedule,
  94                                               isl_set_copy (pbb->domain));
  95       schedule_isl =
  96         isl_union_map_union (schedule_isl,
  97                              isl_union_map_from_map (bb_schedule));
  98     }
  99   return schedule_isl;
 100 }
 101
 102 static isl_ast_node *
 103 scop_to_isl_ast (scop_p scop)
 104 {
 105   isl_union_map *schedule_isl = generate_isl_schedule (scop);
 106   isl_ast_build *context_isl = generate_isl_context (scop);
 107   isl_ast_node *ast_isl = isl_ast_build_ast_from_schedule (context_isl,
 108                                                            schedule_isl);
 109   isl_ast_build_free (context_isl);
 110   return ast_isl;
 111 }
 112
 113 /* GIMPLE Loop Generator: generates loops from STMT in GIMPLE form for
 114    the given SCOP.  Return true if code generation succeeded.
 115
 116    FIXME: This is not yet a full implementation of the code generator
 117           with ISL ASTs. Generation of GIMPLE code is have to be added.  */
 118
 119 bool
 120 graphite_regenerate_ast_isl (scop_p scop)
 121 {
 122   timevar_push (TV_GRAPHITE_CODE_GEN);
 123   graphite_regenerate_error = false;
 124   isl_ast_node *root_node = scop_to_isl_ast (scop);
 125   if (dump_file && (dump_flags & TDF_DETAILS))
 126     {
 127       fprintf (dump_file, "\nISL AST generated by ISL: \n");
 128       print_isl_ast_node (dump_file, root_node, scop->ctx);
 129     }
 130   isl_ast_node_free (root_node);
 131   timevar_pop (TV_GRAPHITE_CODE_GEN);
 132   return !graphite_regenerate_error;
 133 }