2 * Copyright 2012 INRIA Paris-Rocquencourt
4 * Use of this software is governed by the GNU LGPLv2.1 license
6 * Written by Tobias Grosser, INRIA Paris-Rocquencourt,
7 * Domaine de Voluceau, Rocquenqourt, B.P. 105,
8 * 78153 Le Chesnay Cedex France
17 #include <isl/ast_build.h>
22 #include "pet_printer.h"
25 /* Representation of a statement inside a generated AST.
27 * "stmt" refers to the original statement.
28 * "n_access" is the number of accesses in the statement.
29 * "access" is the list of accesses transformed to refer to the iterators
30 * in the generated AST.
33 struct pet_stmt
*stmt
;
36 isl_ast_expr_list
**access
;
39 static void ppcg_stmt_free(void *user
)
41 struct ppcg_stmt
*stmt
= user
;
47 for (i
= 0; i
< stmt
->n_access
; ++i
)
48 isl_ast_expr_list_free(stmt
->access
[i
]);
54 /* Derive the output file name from the input file name.
55 * 'input' is the entire path of the input file. The output
56 * is the file name plus the additional extension.
58 * We will basically replace everything after the last point
59 * with '.ppcg.c'. This means file.c becomes file.ppcg.c
61 FILE *get_output_file(const char *input
)
66 const char ppcg_marker
[] = ".ppcg";
69 base
= strrchr(input
, '/');
74 ext
= strrchr(base
, '.');
75 len
= ext
? ext
- base
: strlen(base
);
77 memcpy(name
, base
, len
);
78 strcpy(name
+ len
, ppcg_marker
);
79 strcpy(name
+ len
+ sizeof(ppcg_marker
) - 1, ext
);
81 return fopen(name
, "w");
84 /* Print a memory access 'access' to the printer 'p'.
86 * "expr" refers to the original access.
87 * "access" is the list of index expressions transformed to refer
88 * to the iterators of the generated AST.
90 * In case the original access is unnamed (and presumably single-dimensional),
91 * we assume this is not a memory access, but just an expression.
93 static __isl_give isl_printer
*print_access(__isl_take isl_printer
*p
,
94 struct pet_expr
*expr
, __isl_keep isl_ast_expr_list
*access
)
100 n_index
= isl_ast_expr_list_n_ast_expr(access
);
101 name
= isl_map_get_tuple_name(expr
->acc
.access
, isl_dim_out
);
105 index
= isl_ast_expr_list_get_ast_expr(access
, 0);
106 p
= isl_printer_print_str(p
, "(");
107 p
= isl_printer_print_ast_expr(p
, index
);
108 p
= isl_printer_print_str(p
, ")");
109 isl_ast_expr_free(index
);
113 p
= isl_printer_print_str(p
, name
);
115 for (i
= 0; i
< n_index
; ++i
) {
118 index
= isl_ast_expr_list_get_ast_expr(access
, i
);
120 p
= isl_printer_print_str(p
, "[");
121 p
= isl_printer_print_ast_expr(p
, index
);
122 p
= isl_printer_print_str(p
, "]");
123 isl_ast_expr_free(index
);
129 /* Find the element in scop->stmts that has the given "id".
131 static struct pet_stmt
*find_stmt(struct ppcg_scop
*scop
, __isl_keep isl_id
*id
)
135 for (i
= 0; i
< scop
->n_stmt
; ++i
) {
136 struct pet_stmt
*stmt
= scop
->stmts
[i
];
139 id_i
= isl_set_get_tuple_id(stmt
->domain
);
146 isl_die(isl_id_get_ctx(id
), isl_error_internal
,
147 "statement not found", return NULL
);
150 /* To print the transformed accesses we walk the list of transformed accesses
151 * simultaneously with the pet printer. This means that whenever
152 * the pet printer prints a pet access expression we have
153 * the corresponding transformed access available for printing.
155 static __isl_give isl_printer
*print_access_expr(__isl_take isl_printer
*p
,
156 struct pet_expr
*expr
, void *user
)
158 isl_ast_expr_list
***access
= user
;
160 p
= print_access(p
, expr
, **access
);
166 /* Print a user statement in the generated AST.
167 * The ppcg_stmt has been attached to the node in at_each_domain.
169 static __isl_give isl_printer
*print_user(__isl_take isl_printer
*p
,
170 __isl_keep isl_ast_node
*node
, void *user
)
172 struct ppcg_stmt
*stmt
;
173 isl_ast_expr_list
**access
;
176 id
= isl_ast_node_get_annotation(node
);
177 stmt
= isl_id_get_user(id
);
180 access
= stmt
->access
;
182 p
= isl_printer_start_line(p
);
183 p
= print_pet_expr(p
, stmt
->stmt
->body
, &print_access_expr
, &access
);
184 p
= isl_printer_print_str(p
, ";");
185 p
= isl_printer_end_line(p
);
190 /* Call "fn" on each access expression in "expr".
192 static int foreach_access_expr(struct pet_expr
*expr
,
193 int (*fn
)(struct pet_expr
*expr
, void *user
), void *user
)
200 if (expr
->type
== pet_expr_access
)
201 return fn(expr
, user
);
203 for (i
= 0; i
< expr
->n_arg
; ++i
)
204 if (foreach_access_expr(expr
->args
[i
], fn
, user
) < 0)
210 static int inc_n_access(struct pet_expr
*expr
, void *user
)
212 struct ppcg_stmt
*stmt
= user
;
217 /* Internal data for add_access.
219 * "stmt" is the statement to which an access needs to be added.
220 * "build" is the current AST build.
221 * "map" maps the AST loop iterators to the iteration domain of the statement.
223 struct ppcg_add_access_data
{
224 struct ppcg_stmt
*stmt
;
225 isl_ast_build
*build
;
229 /* Given an access expression, add it to data->stmt after
230 * transforming it to refer to the AST loop iterators.
232 static int add_access(struct pet_expr
*expr
, void *user
)
237 isl_pw_multi_aff
*pma
;
238 struct ppcg_add_access_data
*data
= user
;
239 isl_ast_expr_list
*index
;
241 ctx
= isl_map_get_ctx(expr
->acc
.access
);
242 n
= isl_map_dim(expr
->acc
.access
, isl_dim_out
);
243 access
= isl_map_copy(expr
->acc
.access
);
244 access
= isl_map_apply_range(isl_map_copy(data
->map
), access
);
245 pma
= isl_pw_multi_aff_from_map(access
);
246 pma
= isl_pw_multi_aff_coalesce(pma
);
248 index
= isl_ast_expr_list_alloc(ctx
, n
);
249 for (i
= 0; i
< n
; ++i
) {
253 pa
= isl_pw_multi_aff_get_pw_aff(pma
, i
);
254 expr
= isl_ast_build_expr_from_pw_aff(data
->build
, pa
);
255 index
= isl_ast_expr_list_add(index
, expr
);
257 isl_pw_multi_aff_free(pma
);
259 data
->stmt
->access
[data
->stmt
->n_access
] = index
;
260 data
->stmt
->n_access
++;
264 /* Transform the accesses in the statement associated to the domain
265 * called by "node" to refer to the AST loop iterators,
266 * collect them in a ppcg_stmt and annotate the node with the ppcg_stmt.
268 static __isl_give isl_ast_node
*at_each_domain(__isl_take isl_ast_node
*node
,
269 __isl_keep isl_ast_build
*build
, void *user
)
271 struct ppcg_scop
*scop
= user
;
272 isl_ast_expr
*expr
, *arg
;
276 struct ppcg_stmt
*stmt
;
277 struct ppcg_add_access_data data
;
279 ctx
= isl_ast_node_get_ctx(node
);
280 stmt
= isl_calloc_type(ctx
, struct ppcg_stmt
);
284 expr
= isl_ast_node_user_get_expr(node
);
285 arg
= isl_ast_expr_get_op_arg(expr
, 0);
286 isl_ast_expr_free(expr
);
287 id
= isl_ast_expr_get_id(arg
);
288 isl_ast_expr_free(arg
);
289 stmt
->stmt
= find_stmt(scop
, id
);
295 if (foreach_access_expr(stmt
->stmt
->body
, &inc_n_access
, stmt
) < 0)
298 stmt
->access
= isl_calloc_array(ctx
, isl_ast_expr_list
*,
303 map
= isl_map_from_union_map(isl_ast_build_get_schedule(build
));
304 map
= isl_map_reverse(map
);
310 if (foreach_access_expr(stmt
->stmt
->body
, &add_access
, &data
) < 0)
311 node
= isl_ast_node_free(node
);
315 id
= isl_id_alloc(isl_ast_node_get_ctx(node
), NULL
, stmt
);
316 id
= isl_id_set_free_user(id
, &ppcg_stmt_free
);
317 return isl_ast_node_set_annotation(node
, id
);
319 ppcg_stmt_free(stmt
);
320 return isl_ast_node_free(node
);
323 /* Code generate the scop 'scop' and print the corresponding C code to 'p'.
325 static __isl_give isl_printer
*print_scop(isl_ctx
*ctx
, struct ppcg_scop
*scop
,
326 __isl_take isl_printer
*p
)
329 isl_union_set
*domain_set
;
330 isl_union_map
*schedule_map
;
331 isl_ast_build
*build
;
332 isl_ast_print_options
*print_options
;
335 context
= isl_set_copy(scop
->context
);
336 domain_set
= isl_union_set_copy(scop
->domain
);
337 schedule_map
= isl_union_map_copy(scop
->schedule
);
338 schedule_map
= isl_union_map_intersect_domain(schedule_map
, domain_set
);
340 build
= isl_ast_build_from_context(context
);
341 build
= isl_ast_build_set_at_each_domain(build
, &at_each_domain
, scop
);
342 tree
= isl_ast_build_ast_from_schedule(build
, schedule_map
);
343 isl_ast_build_free(build
);
345 print_options
= isl_ast_print_options_alloc(ctx
);
346 print_options
= isl_ast_print_options_set_print_user(print_options
,
349 p
= isl_ast_node_print_macros(tree
, p
);
350 p
= isl_ast_node_print(tree
, p
, print_options
);
352 isl_ast_print_options_free(print_options
);
354 isl_ast_node_free(tree
);
359 int generate_cpu(isl_ctx
*ctx
, struct ppcg_scop
*ps
,
360 struct ppcg_options
*options
, const char *input
)
369 input_file
= fopen(input
, "r");
370 output_file
= get_output_file(input
);
372 copy_before_scop(input_file
, output_file
);
373 fprintf(output_file
, "/* ppcg generated CPU code */\n\n");
374 p
= isl_printer_to_file(ctx
, output_file
);
375 p
= isl_printer_set_output_format(p
, ISL_FORMAT_C
);
376 p
= print_scop(ctx
, ps
, p
);
378 copy_after_scop(input_file
, output_file
);