1 /*
2 * Copyright © 2012 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 *
23 * Authors:
24 * Eric Anholt <eric@anholt.net>
25 *
26 */
27
28 #ifndef BRW_CFG_H
29 #define BRW_CFG_H
30
31 #include "brw_shader.h"
32
33 struct bblock_t;
34
35 struct bblock_link {
36 #ifdef __cplusplus
37 DECLARE_RALLOC_CXX_OPERATORS(bblock_link)
38
bblock_linkbblock_link39 bblock_link(bblock_t *block)
40 : block(block)
41 {
42 }
43 #endif
44
45 struct exec_node link;
46 struct bblock_t *block;
47 };
48
49 struct backend_instruction;
50
51 struct bblock_t {
52 #ifdef __cplusplus
53 DECLARE_RALLOC_CXX_OPERATORS(bblock_t)
54
55 explicit bblock_t(cfg_t *cfg);
56
57 void add_successor(void *mem_ctx, bblock_t *successor);
58 bool is_predecessor_of(const bblock_t *block) const;
59 bool is_successor_of(const bblock_t *block) const;
60 bool can_combine_with(const bblock_t *that) const;
61 void combine_with(bblock_t *that);
62 void dump(backend_shader *s) const;
63
64 backend_instruction *start();
65 const backend_instruction *start() const;
66 backend_instruction *end();
67 const backend_instruction *end() const;
68
69 bblock_t *next();
70 const bblock_t *next() const;
71 bblock_t *prev();
72 const bblock_t *prev() const;
73
74 bool starts_with_control_flow() const;
75 bool ends_with_control_flow() const;
76
77 backend_instruction *first_non_control_flow_inst();
78 backend_instruction *last_non_control_flow_inst();
79 #endif
80
81 struct exec_node link;
82 struct cfg_t *cfg;
83 struct bblock_t *idom;
84
85 int start_ip;
86 int end_ip;
87
88 struct exec_list instructions;
89 struct exec_list parents;
90 struct exec_list children;
91 int num;
92
93 unsigned cycle_count;
94 };
95
96 static inline struct backend_instruction *
bblock_start(struct bblock_t * block)97 bblock_start(struct bblock_t *block)
98 {
99 return (struct backend_instruction *)exec_list_get_head(&block->instructions);
100 }
101
102 static inline const struct backend_instruction *
bblock_start_const(const struct bblock_t * block)103 bblock_start_const(const struct bblock_t *block)
104 {
105 return (const struct backend_instruction *)exec_list_get_head_const(&block->instructions);
106 }
107
108 static inline struct backend_instruction *
bblock_end(struct bblock_t * block)109 bblock_end(struct bblock_t *block)
110 {
111 return (struct backend_instruction *)exec_list_get_tail(&block->instructions);
112 }
113
114 static inline const struct backend_instruction *
bblock_end_const(const struct bblock_t * block)115 bblock_end_const(const struct bblock_t *block)
116 {
117 return (const struct backend_instruction *)exec_list_get_tail_const(&block->instructions);
118 }
119
120 static inline struct bblock_t *
bblock_next(struct bblock_t * block)121 bblock_next(struct bblock_t *block)
122 {
123 if (exec_node_is_tail_sentinel(block->link.next))
124 return NULL;
125
126 return (struct bblock_t *)block->link.next;
127 }
128
129 static inline const struct bblock_t *
bblock_next_const(const struct bblock_t * block)130 bblock_next_const(const struct bblock_t *block)
131 {
132 if (exec_node_is_tail_sentinel(block->link.next))
133 return NULL;
134
135 return (const struct bblock_t *)block->link.next;
136 }
137
138 static inline struct bblock_t *
bblock_prev(struct bblock_t * block)139 bblock_prev(struct bblock_t *block)
140 {
141 if (exec_node_is_head_sentinel(block->link.prev))
142 return NULL;
143
144 return (struct bblock_t *)block->link.prev;
145 }
146
147 static inline const struct bblock_t *
bblock_prev_const(const struct bblock_t * block)148 bblock_prev_const(const struct bblock_t *block)
149 {
150 if (exec_node_is_head_sentinel(block->link.prev))
151 return NULL;
152
153 return (const struct bblock_t *)block->link.prev;
154 }
155
156 static inline bool
bblock_starts_with_control_flow(const struct bblock_t * block)157 bblock_starts_with_control_flow(const struct bblock_t *block)
158 {
159 enum opcode op = bblock_start_const(block)->opcode;
160 return op == BRW_OPCODE_DO || op == BRW_OPCODE_ENDIF;
161 }
162
163 static inline bool
bblock_ends_with_control_flow(const struct bblock_t * block)164 bblock_ends_with_control_flow(const struct bblock_t *block)
165 {
166 enum opcode op = bblock_end_const(block)->opcode;
167 return op == BRW_OPCODE_IF ||
168 op == BRW_OPCODE_ELSE ||
169 op == BRW_OPCODE_WHILE ||
170 op == BRW_OPCODE_BREAK ||
171 op == BRW_OPCODE_CONTINUE;
172 }
173
174 static inline struct backend_instruction *
bblock_first_non_control_flow_inst(struct bblock_t * block)175 bblock_first_non_control_flow_inst(struct bblock_t *block)
176 {
177 struct backend_instruction *inst = bblock_start(block);
178 if (bblock_starts_with_control_flow(block))
179 #ifdef __cplusplus
180 inst = (struct backend_instruction *)inst->next;
181 #else
182 inst = (struct backend_instruction *)inst->link.next;
183 #endif
184 return inst;
185 }
186
187 static inline struct backend_instruction *
bblock_last_non_control_flow_inst(struct bblock_t * block)188 bblock_last_non_control_flow_inst(struct bblock_t *block)
189 {
190 struct backend_instruction *inst = bblock_end(block);
191 if (bblock_ends_with_control_flow(block))
192 #ifdef __cplusplus
193 inst = (struct backend_instruction *)inst->prev;
194 #else
195 inst = (struct backend_instruction *)inst->link.prev;
196 #endif
197 return inst;
198 }
199
200 #ifdef __cplusplus
201 inline backend_instruction *
start()202 bblock_t::start()
203 {
204 return bblock_start(this);
205 }
206
207 inline const backend_instruction *
start()208 bblock_t::start() const
209 {
210 return bblock_start_const(this);
211 }
212
213 inline backend_instruction *
end()214 bblock_t::end()
215 {
216 return bblock_end(this);
217 }
218
219 inline const backend_instruction *
end()220 bblock_t::end() const
221 {
222 return bblock_end_const(this);
223 }
224
225 inline bblock_t *
next()226 bblock_t::next()
227 {
228 return bblock_next(this);
229 }
230
231 inline const bblock_t *
next()232 bblock_t::next() const
233 {
234 return bblock_next_const(this);
235 }
236
237 inline bblock_t *
prev()238 bblock_t::prev()
239 {
240 return bblock_prev(this);
241 }
242
243 inline const bblock_t *
prev()244 bblock_t::prev() const
245 {
246 return bblock_prev_const(this);
247 }
248
249 inline bool
starts_with_control_flow()250 bblock_t::starts_with_control_flow() const
251 {
252 return bblock_starts_with_control_flow(this);
253 }
254
255 inline bool
ends_with_control_flow()256 bblock_t::ends_with_control_flow() const
257 {
258 return bblock_ends_with_control_flow(this);
259 }
260
261 inline backend_instruction *
first_non_control_flow_inst()262 bblock_t::first_non_control_flow_inst()
263 {
264 return bblock_first_non_control_flow_inst(this);
265 }
266
267 inline backend_instruction *
last_non_control_flow_inst()268 bblock_t::last_non_control_flow_inst()
269 {
270 return bblock_last_non_control_flow_inst(this);
271 }
272 #endif
273
274 struct cfg_t {
275 #ifdef __cplusplus
276 DECLARE_RALLOC_CXX_OPERATORS(cfg_t)
277
278 cfg_t(exec_list *instructions);
279 ~cfg_t();
280
281 void remove_block(bblock_t *block);
282
283 bblock_t *new_block();
284 void set_next_block(bblock_t **cur, bblock_t *block, int ip);
285 void make_block_array();
286 void calculate_idom();
287 static bblock_t *intersect(bblock_t *b1, bblock_t *b2);
288
289 void dump(backend_shader *s);
290 void dump_cfg();
291 void dump_domtree();
292 #endif
293 void *mem_ctx;
294
295 /** Ordered list (by ip) of basic blocks */
296 struct exec_list block_list;
297 struct bblock_t **blocks;
298 int num_blocks;
299
300 bool idom_dirty;
301
302 unsigned cycle_count;
303 };
304
305 /* Note that this is implemented with a double for loop -- break will
306 * break from the inner loop only!
307 */
308 #define foreach_block_and_inst(__block, __type, __inst, __cfg) \
309 foreach_block (__block, __cfg) \
310 foreach_inst_in_block (__type, __inst, __block)
311
312 /* Note that this is implemented with a double for loop -- break will
313 * break from the inner loop only!
314 */
315 #define foreach_block_and_inst_safe(__block, __type, __inst, __cfg) \
316 foreach_block_safe (__block, __cfg) \
317 foreach_inst_in_block_safe (__type, __inst, __block)
318
319 #define foreach_block(__block, __cfg) \
320 foreach_list_typed (bblock_t, __block, link, &(__cfg)->block_list)
321
322 #define foreach_block_reverse(__block, __cfg) \
323 foreach_list_typed_reverse (bblock_t, __block, link, &(__cfg)->block_list)
324
325 #define foreach_block_safe(__block, __cfg) \
326 foreach_list_typed_safe (bblock_t, __block, link, &(__cfg)->block_list)
327
328 #define foreach_block_reverse_safe(__block, __cfg) \
329 foreach_list_typed_reverse_safe (bblock_t, __block, link, &(__cfg)->block_list)
330
331 #define foreach_inst_in_block(__type, __inst, __block) \
332 foreach_in_list(__type, __inst, &(__block)->instructions)
333
334 #define foreach_inst_in_block_safe(__type, __inst, __block) \
335 for (__type *__inst = (__type *)__block->instructions.head_sentinel.next, \
336 *__next = (__type *)__inst->next; \
337 __next != NULL; \
338 __inst = __next, \
339 __next = (__type *)__next->next)
340
341 #define foreach_inst_in_block_reverse(__type, __inst, __block) \
342 foreach_in_list_reverse(__type, __inst, &(__block)->instructions)
343
344 #define foreach_inst_in_block_reverse_safe(__type, __inst, __block) \
345 foreach_in_list_reverse_safe(__type, __inst, &(__block)->instructions)
346
347 #define foreach_inst_in_block_starting_from(__type, __scan_inst, __inst) \
348 for (__type *__scan_inst = (__type *)__inst->next; \
349 !__scan_inst->is_tail_sentinel(); \
350 __scan_inst = (__type *)__scan_inst->next)
351
352 #define foreach_inst_in_block_reverse_starting_from(__type, __scan_inst, __inst) \
353 for (__type *__scan_inst = (__type *)__inst->prev; \
354 !__scan_inst->is_head_sentinel(); \
355 __scan_inst = (__type *)__scan_inst->prev)
356
357 #endif /* BRW_CFG_H */
358