ppcg.c

   1 /*
   2  * Copyright 2011      INRIA Saclay
   3  *
   4  * Use of this software is governed by the GNU LGPLv2.1 license
   5  *
   6  * Written by Sven Verdoolaege, INRIA Saclay - Ile-de-France,
   7  * Parc Club Orsay Universite, ZAC des vignes, 4 rue Jacques Monod,
   8  * 91893 Orsay, France
   9  */
  10
  11 #include <assert.h>
  12 #include <stdio.h>
  13 #include <isl/ctx.h>
  14 #include <isl/flow.h>
  15 #include <isl/options.h>
  16 #include <isl/schedule.h>
  17 #include <pet.h>
  18 #include "ppcg.h"
  19 #include "ppcg_options.h"
  20 #include "cuda.h"
  21 #include "cpu.h"
  22
  23 struct options {
  24         struct isl_options *isl;
  25         struct pet_options *pet;
  26         struct ppcg_options *ppcg;
  27         char *input;
  28 };
  29
  30 const char *ppcg_version(void);
  31 static void print_version(void)
  32 {
  33         printf("%s", ppcg_version());
  34 }
  35
  36 ISL_ARGS_START(struct options, options_args)
  37 ISL_ARG_CHILD(struct options, isl, "isl", &isl_options_args, "isl options")
  38 ISL_ARG_CHILD(struct options, pet, "pet", &pet_options_args, "pet options")
  39 ISL_ARG_CHILD(struct options, ppcg, NULL, &ppcg_options_args, "ppcg options")
  40 ISL_ARG_ARG(struct options, input, "input", NULL)
  41 ISL_ARG_VERSION(print_version)
  42 ISL_ARGS_END
  43
  44 ISL_ARG_DEF(options, struct options, options_args)
  45
  46 /* Is "stmt" a kill statement?
  47  */
  48 static int is_kill(struct pet_stmt *stmt)
  49 {
  50         if (stmt->body->type != pet_expr_unary)
  51                 return 0;
  52         return stmt->body->op == pet_op_kill;
  53 }
  54
  55 /* Is "stmt" not a kill statement?
  56  */
  57 static int is_not_kill(struct pet_stmt *stmt)
  58 {
  59         return !is_kill(stmt);
  60 }
  61
  62 /* Collect the iteration domains of the statements in "scop" that
  63  * satisfy "pred".
  64  */
  65 static __isl_give isl_union_set *collect_domains(struct pet_scop *scop,
  66         int (*pred)(struct pet_stmt *stmt))
  67 {
  68         int i;
  69         isl_set *domain_i;
  70         isl_union_set *domain;
  71
  72         if (!scop)
  73                 return NULL;
  74
  75         domain = isl_union_set_empty(isl_set_get_space(scop->context));
  76
  77         for (i = 0; i < scop->n_stmt; ++i) {
  78                 struct pet_stmt *stmt = scop->stmts[i];
  79
  80                 if (!pred(stmt))
  81                         continue;
  82                 domain_i = isl_set_copy(scop->stmts[i]->domain);
  83                 domain = isl_union_set_add_set(domain, domain_i);
  84         }
  85
  86         return domain;
  87 }
  88
  89 /* Collect the iteration domains of the statements in "scop",
  90  * skipping kill statements.
  91  */
  92 static __isl_give isl_union_set *collect_non_kill_domains(struct pet_scop *scop)
  93 {
  94         return collect_domains(scop, &is_not_kill);
  95 }
  96
  97 /* Collect all kill accesses in "scop".
  98  */
  99 static __isl_give isl_union_map *collect_kills(struct pet_scop *scop)
 100 {
 101         int i;
 102         isl_union_map *kills;
 103
 104         if (!scop)
 105                 return NULL;
 106
 107         kills = isl_union_map_empty(isl_set_get_space(scop->context));
 108
 109         for (i = 0; i < scop->n_stmt; ++i) {
 110                 struct pet_stmt *stmt = scop->stmts[i];
 111                 isl_map *kill_i;
 112
 113                 if (!is_kill(stmt))
 114                         continue;
 115                 kill_i = isl_map_copy(stmt->body->args[0]->acc.access);
 116                 kills = isl_union_map_add_map(kills, kill_i);
 117         }
 118
 119         return kills;
 120 }
 121
 122 /* Compute (flow) dependences and store the resulting flow dependences
 123  * in scop->dep_flow and the reads with no corresponding writes in
 124  * scop->live_in.
 125  */
 126 static void compute_dependences(struct ppcg_scop *scop)
 127 {
 128         isl_union_map *empty;
 129
 130         if (!scop)
 131                 return;
 132
 133         empty = isl_union_map_empty(isl_union_set_get_space(scop->domain));
 134         isl_union_map_compute_flow(isl_union_map_copy(scop->reads),
 135                                 isl_union_map_copy(scop->writes), empty,
 136                                 isl_union_map_copy(scop->schedule),
 137                                 &scop->dep_flow, NULL, &scop->live_in, NULL);
 138 }
 139
 140 /* Extract a ppcg_scop from a pet_scop.
 141  *
 142  * The constructed ppcg_scop refers to elements from the pet_scop
 143  * so the pet_scop should not be freed before the ppcg_scop.
 144  */
 145 static struct ppcg_scop *ppcg_scop_from_pet_scop(struct pet_scop *scop)
 146 {
 147         isl_ctx *ctx;
 148         struct ppcg_scop *ps;
 149
 150         if (!scop)
 151                 return NULL;
 152
 153         ctx = isl_set_get_ctx(scop->context);
 154
 155         ps = isl_calloc_type(ctx, struct ppcg_scop);
 156         if (!ps)
 157                 return NULL;
 158
 159         ps->context = isl_set_copy(scop->context);
 160         ps->domain = collect_non_kill_domains(scop);
 161         ps->reads = pet_scop_collect_reads(scop);
 162         ps->writes = pet_scop_collect_writes(scop);
 163         ps->kills = collect_kills(scop);
 164         ps->schedule = pet_scop_collect_schedule(scop);
 165         ps->n_array = scop->n_array;
 166         ps->arrays = scop->arrays;
 167         ps->n_stmt = scop->n_stmt;
 168         ps->stmts = scop->stmts;
 169
 170         compute_dependences(ps);
 171
 172         return ps;
 173 }
 174
 175 static void ppcg_scop_free(struct ppcg_scop *ps)
 176 {
 177         if (!ps)
 178                 return;
 179
 180         isl_set_free(ps->context);
 181         isl_union_set_free(ps->domain);
 182         isl_union_map_free(ps->reads);
 183         isl_union_map_free(ps->live_in);
 184         isl_union_map_free(ps->writes);
 185         isl_union_map_free(ps->kills);
 186         isl_union_map_free(ps->dep_flow);
 187         isl_union_map_free(ps->schedule);
 188
 189         free(ps);
 190 }
 191
 192 int main(int argc, char **argv)
 193 {
 194         int r;
 195         isl_ctx *ctx;
 196         struct options *options;
 197         struct pet_scop *scop;
 198         struct ppcg_scop *ps;
 199
 200         options = options_new_with_defaults();
 201         assert(options);
 202
 203         ctx = isl_ctx_alloc_with_options(&options_args, options);
 204         isl_options_set_schedule_outer_zero_distance(ctx, 1);
 205         argc = options_parse(options, argc, argv, ISL_ARG_ALL);
 206
 207         scop = pet_scop_extract_from_C_source(ctx, options->input, NULL);
 208         scop = pet_scop_align_params(scop);
 209         ps = ppcg_scop_from_pet_scop(scop);
 210
 211         if (options->ppcg->target == PPCG_TARGET_CUDA)
 212                 r = generate_cuda(ctx, ps, options->ppcg, options->input);
 213         else
 214                 r = generate_cpu(ctx, ps, options->ppcg, options->input);
 215
 216         ppcg_scop_free(ps);
 217         pet_scop_free(scop);
 218
 219         isl_ctx_free(ctx);
 220
 221         return r;
 222 }