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