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