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 <isl/aff.h>
  11
  12 #include "gpu_print.h"
  13 #include "schedule.h"
  14
  15 static int print_macro(enum isl_ast_op_type type, void *user)
  16 {
  17         isl_printer **p = user;
  18
  19         if (type == isl_ast_op_fdiv_q)
  20                 return 0;
  21
  22         *p = isl_ast_op_type_print_macro(type, *p);
  23
  24         return 0;
  25 }
  26
  27 /* Print the required macros for "node", including one for floord.
  28  * We always print a macro for floord as it may also appear in the statements.
  29  */
  30 __isl_give isl_printer *gpu_print_macros(__isl_take isl_printer *p,
  31         __isl_keep isl_ast_node *node)
  32 {
  33         p = isl_ast_op_type_print_macro(isl_ast_op_fdiv_q, p);
  34         if (isl_ast_node_foreach_ast_op_type(node, &print_macro, &p) < 0)
  35                 return isl_printer_free(p);
  36         return p;
  37 }
  38
  39 /* Print an expression for the size of "array" in bytes.
  40  */
  41 __isl_give isl_printer *gpu_array_info_print_size(__isl_take isl_printer *prn,
  42         struct gpu_array_info *array)
  43 {
  44         int i;
  45
  46         for (i = 0; i < array->n_index; ++i) {
  47                 prn = isl_printer_print_str(prn, "(");
  48                 prn = isl_printer_print_pw_aff(prn, array->bound[i]);
  49                 prn = isl_printer_print_str(prn, ") * ");
  50         }
  51         prn = isl_printer_print_str(prn, "sizeof(");
  52         prn = isl_printer_print_str(prn, array->type);
  53         prn = isl_printer_print_str(prn, ")");
  54
  55         return prn;
  56 }
  57
  58 /* Print an access to the element in the private/shared memory copy
  59  * described by "stmt".  The index of the copy is recorded in
  60  * stmt->local_index as an access to the array.
  61  */
  62 static __isl_give isl_printer *stmt_print_local_index(__isl_take isl_printer *p,
  63         struct ppcg_kernel_stmt *stmt)
  64 {
  65         return isl_printer_print_ast_expr(p, stmt->u.c.local_index);
  66 }
  67
  68 /* Print an access to the element in the global memory copy
  69  * described by "stmt".  The index of the copy is recorded in
  70  * stmt->index as an access to the array.
  71  *
  72  * The copy in global memory has been linearized, so we need to take
  73  * the array size into account.
  74  */
  75 static __isl_give isl_printer *stmt_print_global_index(
  76         __isl_take isl_printer *p, struct ppcg_kernel_stmt *stmt)
  77 {
  78         int i;
  79         struct gpu_array_info *array = stmt->u.c.array;
  80         struct gpu_local_array_info *local = stmt->u.c.local_array;
  81         isl_ast_expr *index;
  82
  83         if (gpu_array_is_scalar(array)) {
  84                 if (!array->read_only)
  85                         p = isl_printer_print_str(p, "*");
  86                 p = isl_printer_print_str(p, array->name);
  87                 return p;
  88         }
  89
  90         index = isl_ast_expr_copy(stmt->u.c.index);
  91         index = gpu_local_array_info_linearize_index(local, index);
  92         p = isl_printer_print_ast_expr(p, index);
  93         isl_ast_expr_free(index);
  94
  95         return p;
  96 }
  97
  98 /* Print a copy statement.
  99  *
 100  * A read copy statement is printed as
 101  *
 102  *      local = global;
 103  *
 104  * while a write copy statement is printed as
 105  *
 106  *      global = local;
 107  */
 108 __isl_give isl_printer *ppcg_kernel_print_copy(__isl_take isl_printer *p,
 109         struct ppcg_kernel_stmt *stmt)
 110 {
 111         p = isl_printer_start_line(p);
 112         if (stmt->u.c.read) {
 113                 p = stmt_print_local_index(p, stmt);
 114                 p = isl_printer_print_str(p, " = ");
 115                 p = stmt_print_global_index(p, stmt);
 116         } else {
 117                 p = stmt_print_global_index(p, stmt);
 118                 p = isl_printer_print_str(p, " = ");
 119                 p = stmt_print_local_index(p, stmt);
 120         }
 121         p = isl_printer_print_str(p, ";");
 122         p = isl_printer_end_line(p);
 123
 124         return p;
 125 }
 126
 127 __isl_give isl_printer *ppcg_kernel_print_domain(__isl_take isl_printer *p,
 128         struct ppcg_kernel_stmt *stmt)
 129 {
 130         return pet_stmt_print_body(stmt->u.d.stmt->stmt, p, stmt->u.d.ref2expr);
 131 }