src/mesa/drivers/dri/i965/brw_cfg.h

   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 #pragma once
  29 #ifndef BRW_CFG_H
  30 #define BRW_CFG_H
  31
  32 #include "brw_shader.h"
  33
  34 struct bblock_t;
  35
  36 struct bblock_link {
  37 #ifdef __cplusplus
  38    DECLARE_RALLOC_CXX_OPERATORS(bblock_link)
  39
  40    bblock_link(bblock_t *block)
  41       : block(block)
  42    {
  43    }
  44 #endif
  45
  46    struct exec_node link;
  47    struct bblock_t *block;
  48 };
  49
  50 struct backend_instruction;
  51
  52 struct bblock_t {
  53 #ifdef __cplusplus
  54    DECLARE_RALLOC_CXX_OPERATORS(bblock_t)
  55
  56    explicit bblock_t(cfg_t *cfg);
  57
  58    void add_successor(void *mem_ctx, bblock_t *successor);
  59    bool is_predecessor_of(const bblock_t *block) const;
  60    bool is_successor_of(const bblock_t *block) const;
  61    bool can_combine_with(const bblock_t *that) const;
  62    void combine_with(bblock_t *that);
  63    void dump(backend_shader *s) const;
  64
  65    backend_instruction *start();
  66    const backend_instruction *start() const;
  67    backend_instruction *end();
  68    const backend_instruction *end() const;
  69
  70    bblock_t *next();
  71    const bblock_t *next() const;
  72    bblock_t *prev();
  73    const bblock_t *prev() const;
  74
  75    bool starts_with_control_flow() const;
  76    bool ends_with_control_flow() const;
  77
  78    backend_instruction *first_non_control_flow_inst();
  79    backend_instruction *last_non_control_flow_inst();
  80 #endif
  81
  82    struct exec_node link;
  83    struct cfg_t *cfg;
  84    struct bblock_t *idom;
  85
  86    int start_ip;
  87    int end_ip;
  88
  89    struct exec_list instructions;
  90    struct exec_list parents;
  91    struct exec_list children;
  92    int num;
  93
  94    unsigned cycle_count;
  95 };
  96
  97 static inline struct backend_instruction *
  98 bblock_start(struct bblock_t *block)
  99 {
 100    return (struct backend_instruction *)exec_list_get_head(&block->instructions);
 101 }
 102
 103 static inline const struct backend_instruction *
 104 bblock_start_const(const struct bblock_t *block)
 105 {
 106    return (const struct backend_instruction *)exec_list_get_head_const(&block->instructions);
 107 }
 108
 109 static inline struct backend_instruction *
 110 bblock_end(struct bblock_t *block)
 111 {
 112    return (struct backend_instruction *)exec_list_get_tail(&block->instructions);
 113 }
 114
 115 static inline const struct backend_instruction *
 116 bblock_end_const(const struct bblock_t *block)
 117 {
 118    return (const struct backend_instruction *)exec_list_get_tail_const(&block->instructions);
 119 }
 120
 121 static inline struct bblock_t *
 122 bblock_next(struct bblock_t *block)
 123 {
 124    return (struct bblock_t *)block->link.next;
 125 }
 126
 127 static inline const struct bblock_t *
 128 bblock_next_const(const struct bblock_t *block)
 129 {
 130    return (const struct bblock_t *)block->link.next;
 131 }
 132
 133 static inline struct bblock_t *
 134 bblock_prev(struct bblock_t *block)
 135 {
 136    return (struct bblock_t *)block->link.prev;
 137 }
 138
 139 static inline const struct bblock_t *
 140 bblock_prev_const(const struct bblock_t *block)
 141 {
 142    return (const struct bblock_t *)block->link.prev;
 143 }
 144
 145 static inline bool
 146 bblock_starts_with_control_flow(const struct bblock_t *block)
 147 {
 148    enum opcode op = bblock_start_const(block)->opcode;
 149    return op == BRW_OPCODE_DO || op == BRW_OPCODE_ENDIF;
 150 }
 151
 152 static inline bool
 153 bblock_ends_with_control_flow(const struct bblock_t *block)
 154 {
 155    enum opcode op = bblock_end_const(block)->opcode;
 156    return op == BRW_OPCODE_IF ||
 157           op == BRW_OPCODE_ELSE ||
 158           op == BRW_OPCODE_WHILE ||
 159           op == BRW_OPCODE_BREAK ||
 160           op == BRW_OPCODE_CONTINUE;
 161 }
 162
 163 static inline struct backend_instruction *
 164 bblock_first_non_control_flow_inst(struct bblock_t *block)
 165 {
 166    struct backend_instruction *inst = bblock_start(block);
 167    if (bblock_starts_with_control_flow(block))
 168 #ifdef __cplusplus
 169       inst = (struct backend_instruction *)inst->next;
 170 #else
 171       inst = (struct backend_instruction *)inst->link.next;
 172 #endif
 173    return inst;
 174 }
 175
 176 static inline struct backend_instruction *
 177 bblock_last_non_control_flow_inst(struct bblock_t *block)
 178 {
 179    struct backend_instruction *inst = bblock_end(block);
 180    if (bblock_ends_with_control_flow(block))
 181 #ifdef __cplusplus
 182       inst = (struct backend_instruction *)inst->prev;
 183 #else
 184       inst = (struct backend_instruction *)inst->link.prev;
 185 #endif
 186    return inst;
 187 }
 188
 189 #ifdef __cplusplus
 190 inline backend_instruction *
 191 bblock_t::start()
 192 {
 193    return bblock_start(this);
 194 }
 195
 196 inline const backend_instruction *
 197 bblock_t::start() const
 198 {
 199    return bblock_start_const(this);
 200 }
 201
 202 inline backend_instruction *
 203 bblock_t::end()
 204 {
 205    return bblock_end(this);
 206 }
 207
 208 inline const backend_instruction *
 209 bblock_t::end() const
 210 {
 211    return bblock_end_const(this);
 212 }
 213
 214 inline bblock_t *
 215 bblock_t::next()
 216 {
 217    return bblock_next(this);
 218 }
 219
 220 inline const bblock_t *
 221 bblock_t::next() const
 222 {
 223    return bblock_next_const(this);
 224 }
 225
 226 inline bblock_t *
 227 bblock_t::prev()
 228 {
 229    return bblock_prev(this);
 230 }
 231
 232 inline const bblock_t *
 233 bblock_t::prev() const
 234 {
 235    return bblock_prev_const(this);
 236 }
 237
 238 inline bool
 239 bblock_t::starts_with_control_flow() const
 240 {
 241    return bblock_starts_with_control_flow(this);
 242 }
 243
 244 inline bool
 245 bblock_t::ends_with_control_flow() const
 246 {
 247    return bblock_ends_with_control_flow(this);
 248 }
 249
 250 inline backend_instruction *
 251 bblock_t::first_non_control_flow_inst()
 252 {
 253    return bblock_first_non_control_flow_inst(this);
 254 }
 255
 256 inline backend_instruction *
 257 bblock_t::last_non_control_flow_inst()
 258 {
 259    return bblock_last_non_control_flow_inst(this);
 260 }
 261 #endif
 262
 263 struct cfg_t {
 264 #ifdef __cplusplus
 265    DECLARE_RALLOC_CXX_OPERATORS(cfg_t)
 266
 267    cfg_t(exec_list *instructions);
 268    ~cfg_t();
 269
 270    void remove_block(bblock_t *block);
 271
 272    bblock_t *new_block();
 273    void set_next_block(bblock_t **cur, bblock_t *block, int ip);
 274    void make_block_array();
 275    void calculate_idom();
 276    static bblock_t *intersect(bblock_t *b1, bblock_t *b2);
 277
 278    void dump(backend_shader *s);
 279    void dump_cfg();
 280    void dump_domtree();
 281 #endif
 282    void *mem_ctx;
 283
 284    /** Ordered list (by ip) of basic blocks */
 285    struct exec_list block_list;
 286    struct bblock_t **blocks;
 287    int num_blocks;
 288
 289    bool idom_dirty;
 290
 291    unsigned cycle_count;
 292 };
 293
 294 /* Note that this is implemented with a double for loop -- break will
 295  * break from the inner loop only!
 296  */
 297 #define foreach_block_and_inst(__block, __type, __inst, __cfg) \
 298    foreach_block (__block, __cfg)                              \
 299       foreach_inst_in_block (__type, __inst, __block)
 300
 301 /* Note that this is implemented with a double for loop -- break will
 302  * break from the inner loop only!
 303  */
 304 #define foreach_block_and_inst_safe(__block, __type, __inst, __cfg) \
 305    foreach_block_safe (__block, __cfg)                              \
 306       foreach_inst_in_block_safe (__type, __inst, __block)
 307
 308 #define foreach_block(__block, __cfg)                          \
 309    foreach_list_typed (bblock_t, __block, link, &(__cfg)->block_list)
 310
 311 #define foreach_block_reverse(__block, __cfg)                  \
 312    foreach_list_typed_reverse (bblock_t, __block, link, &(__cfg)->block_list)
 313
 314 #define foreach_block_safe(__block, __cfg)                     \
 315    foreach_list_typed_safe (bblock_t, __block, link, &(__cfg)->block_list)
 316
 317 #define foreach_inst_in_block(__type, __inst, __block)         \
 318    foreach_in_list(__type, __inst, &(__block)->instructions)
 319
 320 #define foreach_inst_in_block_safe(__type, __inst, __block)    \
 321    for (__type *__inst = (__type *)__block->instructions.head, \
 322                *__next = (__type *)__inst->next,               \
 323                *__end = (__type *)__block->instructions.tail;  \
 324         __next != __end;                                       \
 325         __inst = __next,                                       \
 326         __next = (__type *)__next->next)
 327
 328 #define foreach_inst_in_block_reverse(__type, __inst, __block) \
 329    foreach_in_list_reverse(__type, __inst, &(__block)->instructions)
 330
 331 #define foreach_inst_in_block_reverse_safe(__type, __inst, __block) \
 332    foreach_in_list_reverse_safe(__type, __inst, &(__block)->instructions)
 333
 334 #define foreach_inst_in_block_starting_from(__type, __scan_inst, __inst) \
 335    for (__type *__scan_inst = (__type *)__inst->next;          \
 336         !__scan_inst->is_tail_sentinel();                      \
 337         __scan_inst = (__type *)__scan_inst->next)
 338
 339 #define foreach_inst_in_block_reverse_starting_from(__type, __scan_inst, __inst) \
 340    for (__type *__scan_inst = (__type *)__inst->prev;          \
 341         !__scan_inst->is_head_sentinel();                      \
 342         __scan_inst = (__type *)__scan_inst->prev)
 343
 344 #endif /* BRW_CFG_H */