gpu_print.c

   1 /*
   2  * Copyright 2012      Ecole Normale Superieure
   3  *
   4  * Use of this software is governed by the MIT license
   5  *
   6  * Written by Sven Verdoolaege,
   7  * Ecole Normale Superieure, 45 rue d’Ulm, 75230 Paris, France
   8  */
   9
  10 #include <string.h>
  11
  12 #include <isl/aff.h>
  13
  14 #include "gpu_print.h"
  15 #include "print.h"
  16 #include "schedule.h"
  17
  18 /* Print declarations to "p" for arrays that are local to "prog"
  19  * but that are used on the host and therefore require a declaration.
  20  */
  21 __isl_give isl_printer *gpu_print_local_declarations(__isl_take isl_printer *p,
  22         struct gpu_prog *prog)
  23 {
  24         int i;
  25         isl_ast_build *build;
  26
  27         if (!prog)
  28                 return isl_printer_free(p);
  29
  30         build = isl_ast_build_from_context(isl_set_copy(prog->scop->context));
  31         for (i = 0; i < prog->n_array; ++i) {
  32                 if (!prog->array[i].declare_local)
  33                         continue;
  34                 p = ppcg_print_declaration(p, prog->scop->pet->arrays[i],
  35                                             build);
  36         }
  37         isl_ast_build_free(build);
  38
  39         return p;
  40 }
  41
  42 /* Print an expression for the size of "array" in bytes.
  43  */
  44 __isl_give isl_printer *gpu_array_info_print_size(__isl_take isl_printer *prn,
  45         struct gpu_array_info *array)
  46 {
  47         int i;
  48
  49         for (i = 0; i < array->n_index; ++i) {
  50                 isl_ast_expr *bound;
  51
  52                 prn = isl_printer_print_str(prn, "(");
  53                 bound = isl_ast_expr_get_op_arg(array->bound_expr, 1 + i);
  54                 prn = isl_printer_print_ast_expr(prn, bound);
  55                 isl_ast_expr_free(bound);
  56                 prn = isl_printer_print_str(prn, ") * ");
  57         }
  58         prn = isl_printer_print_str(prn, "sizeof(");
  59         prn = isl_printer_print_str(prn, array->type);
  60         prn = isl_printer_print_str(prn, ")");
  61
  62         return prn;
  63 }
  64
  65 /* Print the declaration of a non-linearized array argument.
  66  */
  67 static __isl_give isl_printer *print_non_linearized_declaration_argument(
  68         __isl_take isl_printer *p, struct gpu_array_info *array)
  69 {
  70         p = isl_printer_print_str(p, array->type);
  71         p = isl_printer_print_str(p, " ");
  72
  73         p = isl_printer_print_ast_expr(p, array->bound_expr);
  74
  75         return p;
  76 }
  77
  78 /* Print the declaration of an array argument.
  79  * "memory_space" allows to specify a memory space prefix.
  80  */
  81 __isl_give isl_printer *gpu_array_info_print_declaration_argument(
  82         __isl_take isl_printer *p, struct gpu_array_info *array,
  83         const char *memory_space)
  84 {
  85         if (gpu_array_is_read_only_scalar(array)) {
  86                 p = isl_printer_print_str(p, array->type);
  87                 p = isl_printer_print_str(p, " ");
  88                 p = isl_printer_print_str(p, array->name);
  89                 return p;
  90         }
  91
  92         if (memory_space) {
  93                 p = isl_printer_print_str(p, memory_space);
  94                 p = isl_printer_print_str(p, " ");
  95         }
  96
  97         if (array->n_index != 0 && !array->linearize)
  98                 return print_non_linearized_declaration_argument(p, array);
  99
 100         p = isl_printer_print_str(p, array->type);
 101         p = isl_printer_print_str(p, " ");
 102         p = isl_printer_print_str(p, "*");
 103         p = isl_printer_print_str(p, array->name);
 104
 105         return p;
 106 }
 107
 108 /* Print the call of an array argument.
 109  */
 110 __isl_give isl_printer *gpu_array_info_print_call_argument(
 111         __isl_take isl_printer *p, struct gpu_array_info *array)
 112 {
 113         if (gpu_array_is_read_only_scalar(array))
 114                 return isl_printer_print_str(p, array->name);
 115
 116         p = isl_printer_print_str(p, "dev_");
 117         p = isl_printer_print_str(p, array->name);
 118
 119         return p;
 120 }
 121
 122 /* Print an access to the element in the private/shared memory copy
 123  * described by "stmt".  The index of the copy is recorded in
 124  * stmt->local_index as an access to the array.
 125  */
 126 static __isl_give isl_printer *stmt_print_local_index(__isl_take isl_printer *p,
 127         struct ppcg_kernel_stmt *stmt)
 128 {
 129         return isl_printer_print_ast_expr(p, stmt->u.c.local_index);
 130 }
 131
 132 /* Print an access to the element in the global memory copy
 133  * described by "stmt".  The index of the copy is recorded in
 134  * stmt->index as an access to the array.
 135  *
 136  * The copy in global memory has been linearized, so we need to take
 137  * the array size into account.
 138  */
 139 static __isl_give isl_printer *stmt_print_global_index(
 140         __isl_take isl_printer *p, struct ppcg_kernel_stmt *stmt)
 141 {
 142         int i;
 143         struct gpu_array_info *array = stmt->u.c.array;
 144         struct gpu_local_array_info *local = stmt->u.c.local_array;
 145         isl_ast_expr *index;
 146
 147         if (gpu_array_is_scalar(array)) {
 148                 if (!gpu_array_is_read_only_scalar(array))
 149                         p = isl_printer_print_str(p, "*");
 150                 p = isl_printer_print_str(p, array->name);
 151                 return p;
 152         }
 153
 154         index = isl_ast_expr_copy(stmt->u.c.index);
 155         if (array->linearize)
 156                 index = gpu_local_array_info_linearize_index(local, index);
 157
 158         p = isl_printer_print_ast_expr(p, index);
 159         isl_ast_expr_free(index);
 160
 161         return p;
 162 }
 163
 164 /* Print a copy statement.
 165  *
 166  * A read copy statement is printed as
 167  *
 168  *      local = global;
 169  *
 170  * while a write copy statement is printed as
 171  *
 172  *      global = local;
 173  */
 174 __isl_give isl_printer *ppcg_kernel_print_copy(__isl_take isl_printer *p,
 175         struct ppcg_kernel_stmt *stmt)
 176 {
 177         p = isl_printer_start_line(p);
 178         if (stmt->u.c.read) {
 179                 p = stmt_print_local_index(p, stmt);
 180                 p = isl_printer_print_str(p, " = ");
 181                 p = stmt_print_global_index(p, stmt);
 182         } else {
 183                 p = stmt_print_global_index(p, stmt);
 184                 p = isl_printer_print_str(p, " = ");
 185                 p = stmt_print_local_index(p, stmt);
 186         }
 187         p = isl_printer_print_str(p, ";");
 188         p = isl_printer_end_line(p);
 189
 190         return p;
 191 }
 192
 193 __isl_give isl_printer *ppcg_kernel_print_domain(__isl_take isl_printer *p,
 194         struct ppcg_kernel_stmt *stmt)
 195 {
 196         return pet_stmt_print_body(stmt->u.d.stmt->stmt, p, stmt->u.d.ref2expr);
 197 }
 198
 199 /* Was the definition of "type" printed before?
 200  * That is, does its name appear in the list of printed types "types"?
 201  */
 202 static int already_printed(struct gpu_types *types,
 203         struct pet_type *type)
 204 {
 205         int i;
 206
 207         for (i = 0; i < types->n; ++i)
 208                 if (!strcmp(types->name[i], type->name))
 209                         return 1;
 210
 211         return 0;
 212 }
 213
 214 /* Print the definitions of all types prog->scop that have not been
 215  * printed before (according to "types") on "p".
 216  * Extend the list of printed types "types" with the newly printed types.
 217  */
 218 __isl_give isl_printer *gpu_print_types(__isl_take isl_printer *p,
 219         struct gpu_types *types, struct gpu_prog *prog)
 220 {
 221         int i, n;
 222         isl_ctx *ctx;
 223         char **name;
 224
 225         n = prog->scop->pet->n_type;
 226
 227         if (n == 0)
 228                 return p;
 229
 230         ctx = isl_printer_get_ctx(p);
 231         name = isl_realloc_array(ctx, types->name, char *, types->n + n);
 232         if (!name)
 233                 return isl_printer_free(p);
 234         types->name = name;
 235
 236         for (i = 0; i < n; ++i) {
 237                 struct pet_type *type = prog->scop->pet->types[i];
 238
 239                 if (already_printed(types, type))
 240                         continue;
 241
 242                 p = isl_printer_start_line(p);
 243                 p = isl_printer_print_str(p, type->definition);
 244                 p = isl_printer_print_str(p, ";");
 245                 p = isl_printer_end_line(p);
 246
 247                 types->name[types->n++] = strdup(type->name);
 248         }
 249
 250         return p;
 251 }