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 /* Compute (flow) dependences and store the resulting flow dependences
  98  * in scop->dep_flow and the reads with no corresponding writes in
  99  * scop->live_in.
 100  */
 101 static void compute_dependences(struct ppcg_scop *scop)
 102 {
 103         isl_union_map *empty;
 104
 105         if (!scop)
 106                 return;
 107
 108         empty = isl_union_map_empty(isl_union_set_get_space(scop->domain));
 109         isl_union_map_compute_flow(isl_union_map_copy(scop->reads),
 110                                 isl_union_map_copy(scop->writes), empty,
 111                                 isl_union_map_copy(scop->schedule),
 112                                 &scop->dep_flow, NULL, &scop->live_in, NULL);
 113 }
 114
 115 /* Extract a ppcg_scop from a pet_scop.
 116  *
 117  * The constructed ppcg_scop refers to elements from the pet_scop
 118  * so the pet_scop should not be freed before the ppcg_scop.
 119  */
 120 static struct ppcg_scop *ppcg_scop_from_pet_scop(struct pet_scop *scop)
 121 {
 122         isl_ctx *ctx;
 123         struct ppcg_scop *ps;
 124
 125         if (!scop)
 126                 return NULL;
 127
 128         ctx = isl_set_get_ctx(scop->context);
 129
 130         ps = isl_calloc_type(ctx, struct ppcg_scop);
 131         if (!ps)
 132                 return NULL;
 133
 134         ps->context = isl_set_copy(scop->context);
 135         ps->domain = collect_non_kill_domains(scop);
 136         ps->reads = pet_scop_collect_reads(scop);
 137         ps->writes = pet_scop_collect_writes(scop);
 138         ps->schedule = pet_scop_collect_schedule(scop);
 139         ps->n_array = scop->n_array;
 140         ps->arrays = scop->arrays;
 141         ps->n_stmt = scop->n_stmt;
 142         ps->stmts = scop->stmts;
 143
 144         compute_dependences(ps);
 145
 146         return ps;
 147 }
 148
 149 static void ppcg_scop_free(struct ppcg_scop *ps)
 150 {
 151         if (!ps)
 152                 return;
 153
 154         isl_set_free(ps->context);
 155         isl_union_set_free(ps->domain);
 156         isl_union_map_free(ps->reads);
 157         isl_union_map_free(ps->live_in);
 158         isl_union_map_free(ps->writes);
 159         isl_union_map_free(ps->dep_flow);
 160         isl_union_map_free(ps->schedule);
 161
 162         free(ps);
 163 }
 164
 165 int main(int argc, char **argv)
 166 {
 167         int r;
 168         isl_ctx *ctx;
 169         struct options *options;
 170         struct pet_scop *scop;
 171         struct ppcg_scop *ps;
 172
 173         options = options_new_with_defaults();
 174         assert(options);
 175
 176         ctx = isl_ctx_alloc_with_options(&options_args, options);
 177         isl_options_set_schedule_outer_zero_distance(ctx, 1);
 178         argc = options_parse(options, argc, argv, ISL_ARG_ALL);
 179
 180         scop = pet_scop_extract_from_C_source(ctx, options->input, NULL);
 181         scop = pet_scop_align_params(scop);
 182         ps = ppcg_scop_from_pet_scop(scop);
 183
 184         if (options->ppcg->target == PPCG_TARGET_CUDA)
 185                 r = generate_cuda(ctx, ps, options->ppcg, options->input);
 186         else
 187                 r = generate_cpu(ctx, ps, options->ppcg, options->input);
 188
 189         ppcg_scop_free(ps);
 190         pet_scop_free(scop);
 191
 192         isl_ctx_free(ctx);
 193
 194         return r;
 195 }