src/panfrost/midgard/compiler.h

   1 /*
   2  * Copyright (C) 2019 Alyssa Rosenzweig <alyssa@rosenzweig.io>
   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 FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  */
  23
  24 #ifndef _MDG_COMPILER_H
  25 #define _MDG_COMPILER_H
  26
  27 #include "midgard.h"
  28 #include "helpers.h"
  29 #include "midgard_compile.h"
  30
  31 #include "util/hash_table.h"
  32 #include "util/u_dynarray.h"
  33 #include "util/set.h"
  34 #include "util/list.h"
  35
  36 #include "main/mtypes.h"
  37 #include "compiler/nir_types.h"
  38 #include "compiler/nir/nir.h"
  39
  40 /* Forward declare */
  41 struct midgard_block;
  42
  43 /* Target types. Defaults to TARGET_GOTO (the type corresponding directly to
  44  * the hardware), hence why that must be zero. TARGET_DISCARD signals this
  45  * instruction is actually a discard op. */
  46
  47 #define TARGET_GOTO 0
  48 #define TARGET_BREAK 1
  49 #define TARGET_CONTINUE 2
  50 #define TARGET_DISCARD 3
  51
  52 typedef struct midgard_branch {
  53         /* If conditional, the condition is specified in r31.w */
  54         bool conditional;
  55
  56         /* For conditionals, if this is true, we branch on FALSE. If false, we  branch on TRUE. */
  57         bool invert_conditional;
  58
  59         /* Branch targets: the start of a block, the start of a loop (continue), the end of a loop (break). Value is one of TARGET_ */
  60         unsigned target_type;
  61
  62         /* The actual target */
  63         union {
  64                 int target_block;
  65                 int target_break;
  66                 int target_continue;
  67         };
  68 } midgard_branch;
  69
  70 /* Generic in-memory data type repesenting a single logical instruction, rather
  71  * than a single instruction group. This is the preferred form for code gen.
  72  * Multiple midgard_insturctions will later be combined during scheduling,
  73  * though this is not represented in this structure.  Its format bridges
  74  * the low-level binary representation with the higher level semantic meaning.
  75  *
  76  * Notably, it allows registers to be specified as block local SSA, for code
  77  * emitted before the register allocation pass.
  78  */
  79
  80 #define MIR_SRC_COUNT 3
  81 #define MIR_VEC_COMPONENTS 16
  82
  83 typedef struct midgard_instruction {
  84         /* Must be first for casting */
  85         struct list_head link;
  86
  87         unsigned type; /* ALU, load/store, texture */
  88
  89         /* Instruction arguments represented as block-local SSA
  90          * indices, rather than registers. ~0 means unused. */
  91         unsigned src[3];
  92         unsigned dest;
  93
  94         /* vec16 swizzle, unpacked, per source */
  95         unsigned swizzle[MIR_SRC_COUNT][MIR_VEC_COMPONENTS];
  96
  97         /* Special fields for an ALU instruction */
  98         midgard_reg_info registers;
  99
 100         /* I.e. (1 << alu_bit) */
 101         int unit;
 102
 103         bool has_constants;
 104         uint32_t constants[4];
 105         uint16_t inline_constant;
 106         bool has_blend_constant;
 107         bool has_inline_constant;
 108
 109         bool compact_branch;
 110         bool writeout;
 111         bool prepacked_branch;
 112
 113         /* Kind of a hack, but hint against aggressive DCE */
 114         bool dont_eliminate;
 115
 116         /* Masks in a saneish format. One bit per channel, not packed fancy.
 117          * Use this instead of the op specific ones, and switch over at emit
 118          * time */
 119
 120         uint16_t mask;
 121
 122         /* For ALU ops only: set to true to invert (bitwise NOT) the
 123          * destination of an integer-out op. Not imeplemented in hardware but
 124          * allows more optimizations */
 125
 126         bool invert;
 127
 128         /* Hint for the register allocator not to spill the destination written
 129          * from this instruction (because it is a spill/unspill node itself) */
 130
 131         bool no_spill;
 132
 133         /* Generic hint for intra-pass use */
 134         bool hint;
 135
 136         /* During scheduling, the backwards dependency graph
 137          * (DAG). nr_dependencies is the number of unscheduled
 138          * instructions that must still be scheduled after
 139          * (before) this instruction. dependents are which
 140          * instructions need to be scheduled before (after) this
 141          * instruction. */
 142
 143         unsigned nr_dependencies;
 144         BITSET_WORD *dependents;
 145
 146         union {
 147                 midgard_load_store_word load_store;
 148                 midgard_vector_alu alu;
 149                 midgard_texture_word texture;
 150                 midgard_branch_extended branch_extended;
 151                 uint16_t br_compact;
 152
 153                 /* General branch, rather than packed br_compact. Higher level
 154                  * than the other components */
 155                 midgard_branch branch;
 156         };
 157 } midgard_instruction;
 158
 159 typedef struct midgard_block {
 160         /* Link to next block. Must be first for mir_get_block */
 161         struct list_head link;
 162
 163         /* List of midgard_instructions emitted for the current block */
 164         struct list_head instructions;
 165
 166         /* Index of the block in source order */
 167         unsigned source_id;
 168
 169         bool is_scheduled;
 170
 171         /* List of midgard_bundles emitted (after the scheduler has run) */
 172         struct util_dynarray bundles;
 173
 174         /* Number of quadwords _actually_ emitted, as determined after scheduling */
 175         unsigned quadword_count;
 176
 177         /* Succeeding blocks. The compiler should not necessarily rely on
 178          * source-order traversal */
 179         struct midgard_block *successors[2];
 180         unsigned nr_successors;
 181
 182         struct set *predecessors;
 183
 184         /* The successors pointer form a graph, and in the case of
 185          * complex control flow, this graph has a cycles. To aid
 186          * traversal during liveness analysis, we have a visited?
 187          * boolean for passes to use as they see fit, provided they
 188          * clean up later */
 189         bool visited;
 190
 191         /* In liveness analysis, these are live masks (per-component) for
 192          * indices for the block. Scalar compilers have the luxury of using
 193          * simple bit fields, but for us, liveness is a vector idea. */
 194         uint16_t *live_in;
 195         uint16_t *live_out;
 196 } midgard_block;
 197
 198 typedef struct midgard_bundle {
 199         /* Tag for the overall bundle */
 200         int tag;
 201
 202         /* Instructions contained by the bundle. instruction_count <= 6 (vmul,
 203          * sadd, vadd, smul, vlut, branch) */
 204         int instruction_count;
 205         midgard_instruction *instructions[6];
 206
 207         /* Bundle-wide ALU configuration */
 208         int padding;
 209         int control;
 210         bool has_embedded_constants;
 211         float constants[4];
 212         bool has_blend_constant;
 213 } midgard_bundle;
 214
 215 typedef struct compiler_context {
 216         nir_shader *nir;
 217         gl_shader_stage stage;
 218
 219         /* The screen we correspond to */
 220         struct midgard_screen *screen;
 221
 222         /* Is internally a blend shader? Depends on stage == FRAGMENT */
 223         bool is_blend;
 224
 225         /* Tracking for blend constant patching */
 226         int blend_constant_offset;
 227
 228         /* Number of bytes used for Thread Local Storage */
 229         unsigned tls_size;
 230
 231         /* Count of spills and fills for shaderdb */
 232         unsigned spills;
 233         unsigned fills;
 234
 235         /* Current NIR function */
 236         nir_function *func;
 237
 238         /* Allocated compiler temporary counter */
 239         unsigned temp_alloc;
 240
 241         /* Unordered list of midgard_blocks */
 242         int block_count;
 243         struct list_head blocks;
 244
 245         /* TODO merge with block_count? */
 246         unsigned block_source_count;
 247
 248         /* List of midgard_instructions emitted for the current block */
 249         midgard_block *current_block;
 250
 251         /* If there is a preset after block, use this, otherwise emit_block will create one if NULL */
 252         midgard_block *after_block;
 253
 254         /* The current "depth" of the loop, for disambiguating breaks/continues
 255          * when using nested loops */
 256         int current_loop_depth;
 257
 258         /* Total number of loops for shader-db */
 259         unsigned loop_count;
 260
 261         /* Constants which have been loaded, for later inlining */
 262         struct hash_table_u64 *ssa_constants;
 263
 264         /* Mapping of hashes computed from NIR indices to the sequential temp indices ultimately used in MIR */
 265         struct hash_table_u64 *hash_to_temp;
 266         int temp_count;
 267         int max_hash;
 268
 269         /* Just the count of the max register used. Higher count => higher
 270          * register pressure */
 271         int work_registers;
 272
 273         /* Used for cont/last hinting. Increase when a tex op is added.
 274          * Decrease when a tex op is removed. */
 275         int texture_op_count;
 276
 277         /* The number of uniforms allowable for the fast path */
 278         int uniform_cutoff;
 279
 280         /* Count of instructions emitted from NIR overall, across all blocks */
 281         int instruction_count;
 282
 283         /* Alpha ref value passed in */
 284         float alpha_ref;
 285
 286         unsigned quadword_count;
 287
 288         /* The mapping of sysvals to uniforms, the count, and the off-by-one inverse */
 289         unsigned sysvals[MAX_SYSVAL_COUNT];
 290         unsigned sysval_count;
 291         struct hash_table_u64 *sysval_to_id;
 292
 293         /* Bitmask of valid metadata */
 294         unsigned metadata;
 295 } compiler_context;
 296
 297 /* Per-block live_in/live_out */
 298 #define MIDGARD_METADATA_LIVENESS (1 << 0)
 299
 300 /* Helpers for manipulating the above structures (forming the driver IR) */
 301
 302 /* Append instruction to end of current block */
 303
 304 static inline midgard_instruction *
 305 mir_upload_ins(struct compiler_context *ctx, struct midgard_instruction ins)
 306 {
 307         midgard_instruction *heap = ralloc(ctx, struct midgard_instruction);
 308         memcpy(heap, &ins, sizeof(ins));
 309         return heap;
 310 }
 311
 312 static inline midgard_instruction *
 313 emit_mir_instruction(struct compiler_context *ctx, struct midgard_instruction ins)
 314 {
 315         midgard_instruction *u = mir_upload_ins(ctx, ins);
 316         list_addtail(&u->link, &ctx->current_block->instructions);
 317         return u;
 318 }
 319
 320 static inline struct midgard_instruction *
 321 mir_insert_instruction_before(struct compiler_context *ctx,
 322                               struct midgard_instruction *tag,
 323                               struct midgard_instruction ins)
 324 {
 325         struct midgard_instruction *u = mir_upload_ins(ctx, ins);
 326         list_addtail(&u->link, &tag->link);
 327         return u;
 328 }
 329
 330 static inline void
 331 mir_remove_instruction(struct midgard_instruction *ins)
 332 {
 333         list_del(&ins->link);
 334 }
 335
 336 static inline midgard_instruction*
 337 mir_prev_op(struct midgard_instruction *ins)
 338 {
 339         return list_last_entry(&(ins->link), midgard_instruction, link);
 340 }
 341
 342 static inline midgard_instruction*
 343 mir_next_op(struct midgard_instruction *ins)
 344 {
 345         return list_first_entry(&(ins->link), midgard_instruction, link);
 346 }
 347
 348 #define mir_foreach_block(ctx, v) \
 349         list_for_each_entry(struct midgard_block, v, &ctx->blocks, link)
 350
 351 #define mir_foreach_block_from(ctx, from, v) \
 352         list_for_each_entry_from(struct midgard_block, v, from, &ctx->blocks, link)
 353
 354 #define mir_foreach_instr(ctx, v) \
 355         list_for_each_entry(struct midgard_instruction, v, &ctx->current_block->instructions, link)
 356
 357 #define mir_foreach_instr_safe(ctx, v) \
 358         list_for_each_entry_safe(struct midgard_instruction, v, &ctx->current_block->instructions, link)
 359
 360 #define mir_foreach_instr_in_block(block, v) \
 361         list_for_each_entry(struct midgard_instruction, v, &block->instructions, link)
 362 #define mir_foreach_instr_in_block_rev(block, v) \
 363         list_for_each_entry_rev(struct midgard_instruction, v, &block->instructions, link)
 364
 365 #define mir_foreach_instr_in_block_safe(block, v) \
 366         list_for_each_entry_safe(struct midgard_instruction, v, &block->instructions, link)
 367
 368 #define mir_foreach_instr_in_block_safe_rev(block, v) \
 369         list_for_each_entry_safe_rev(struct midgard_instruction, v, &block->instructions, link)
 370
 371 #define mir_foreach_instr_in_block_from(block, v, from) \
 372         list_for_each_entry_from(struct midgard_instruction, v, from, &block->instructions, link)
 373
 374 #define mir_foreach_instr_in_block_from_rev(block, v, from) \
 375         list_for_each_entry_from_rev(struct midgard_instruction, v, from, &block->instructions, link)
 376
 377 #define mir_foreach_bundle_in_block(block, v) \
 378         util_dynarray_foreach(&block->bundles, midgard_bundle, v)
 379
 380 #define mir_foreach_bundle_in_block_rev(block, v) \
 381         util_dynarray_foreach_reverse(&block->bundles, midgard_bundle, v)
 382
 383 #define mir_foreach_instr_in_block_scheduled_rev(block, v) \
 384         midgard_instruction* v; \
 385         signed i = 0; \
 386         mir_foreach_bundle_in_block_rev(block, _bundle) \
 387                 for (i = (_bundle->instruction_count - 1), v = _bundle->instructions[i]; \
 388                                 i >= 0; \
 389                                 --i, v = _bundle->instructions[i]) \
 390
 391 #define mir_foreach_instr_global(ctx, v) \
 392         mir_foreach_block(ctx, v_block) \
 393                 mir_foreach_instr_in_block(v_block, v)
 394
 395 #define mir_foreach_instr_global_safe(ctx, v) \
 396         mir_foreach_block(ctx, v_block) \
 397                 mir_foreach_instr_in_block_safe(v_block, v)
 398
 399 #define mir_foreach_successor(blk, v) \
 400         struct midgard_block *v; \
 401         struct midgard_block **_v; \
 402         for (_v = &blk->successors[0], \
 403                 v = *_v; \
 404                 v != NULL && _v < &blk->successors[2]; \
 405                 _v++, v = *_v) \
 406
 407 /* Based on set_foreach, expanded with automatic type casts */
 408
 409 #define mir_foreach_predecessor(blk, v) \
 410         struct set_entry *_entry_##v; \
 411         struct midgard_block *v; \
 412         for (_entry_##v = _mesa_set_next_entry(blk->predecessors, NULL), \
 413                 v = (struct midgard_block *) (_entry_##v ? _entry_##v->key : NULL);  \
 414                 _entry_##v != NULL; \
 415                 _entry_##v = _mesa_set_next_entry(blk->predecessors, _entry_##v), \
 416                 v = (struct midgard_block *) (_entry_##v ? _entry_##v->key : NULL))
 417
 418 #define mir_foreach_src(ins, v) \
 419         for (unsigned v = 0; v < ARRAY_SIZE(ins->src); ++v)
 420
 421 static inline midgard_instruction *
 422 mir_last_in_block(struct midgard_block *block)
 423 {
 424         return list_last_entry(&block->instructions, struct midgard_instruction, link);
 425 }
 426
 427 static inline midgard_block *
 428 mir_get_block(compiler_context *ctx, int idx)
 429 {
 430         struct list_head *lst = &ctx->blocks;
 431
 432         while ((idx--) + 1)
 433                 lst = lst->next;
 434
 435         return (struct midgard_block *) lst;
 436 }
 437
 438 static inline midgard_block *
 439 mir_exit_block(struct compiler_context *ctx)
 440 {
 441         midgard_block *last = list_last_entry(&ctx->blocks,
 442                         struct midgard_block, link);
 443
 444         /* The last block must be empty logically but contains branch writeout
 445          * for fragment shaders */
 446
 447         assert(last->nr_successors == 0);
 448
 449         return last;
 450 }
 451
 452 static inline bool
 453 mir_is_alu_bundle(midgard_bundle *bundle)
 454 {
 455         return IS_ALU(bundle->tag);
 456 }
 457
 458 /* Registers/SSA are distinguish in the backend by the bottom-most bit */
 459
 460 #define IS_REG (1)
 461
 462 static inline unsigned
 463 make_compiler_temp(compiler_context *ctx)
 464 {
 465         return (ctx->func->impl->ssa_alloc + ctx->temp_alloc++) << 1;
 466 }
 467
 468 static inline unsigned
 469 make_compiler_temp_reg(compiler_context *ctx)
 470 {
 471         return ((ctx->func->impl->reg_alloc + ctx->temp_alloc++) << 1) | IS_REG;
 472 }
 473
 474 static inline unsigned
 475 nir_src_index(compiler_context *ctx, nir_src *src)
 476 {
 477         if (src->is_ssa)
 478                 return (src->ssa->index << 1) | 0;
 479         else {
 480                 assert(!src->reg.indirect);
 481                 return (src->reg.reg->index << 1) | IS_REG;
 482         }
 483 }
 484
 485 static inline unsigned
 486 nir_alu_src_index(compiler_context *ctx, nir_alu_src *src)
 487 {
 488         return nir_src_index(ctx, &src->src);
 489 }
 490
 491 static inline unsigned
 492 nir_dest_index(compiler_context *ctx, nir_dest *dst)
 493 {
 494         if (dst->is_ssa)
 495                 return (dst->ssa.index << 1) | 0;
 496         else {
 497                 assert(!dst->reg.indirect);
 498                 return (dst->reg.reg->index << 1) | IS_REG;
 499         }
 500 }
 501
 502
 503
 504 /* MIR manipulation */
 505
 506 void mir_rewrite_index(compiler_context *ctx, unsigned old, unsigned new);
 507 void mir_rewrite_index_src(compiler_context *ctx, unsigned old, unsigned new);
 508 void mir_rewrite_index_dst(compiler_context *ctx, unsigned old, unsigned new);
 509 void mir_rewrite_index_dst_single(midgard_instruction *ins, unsigned old, unsigned new);
 510 void mir_rewrite_index_src_single(midgard_instruction *ins, unsigned old, unsigned new);
 511 void mir_rewrite_index_src_swizzle(compiler_context *ctx, unsigned old, unsigned new, unsigned *swizzle);
 512 bool mir_single_use(compiler_context *ctx, unsigned value);
 513 bool mir_special_index(compiler_context *ctx, unsigned idx);
 514 unsigned mir_use_count(compiler_context *ctx, unsigned value);
 515 bool mir_is_written_before(compiler_context *ctx, midgard_instruction *ins, unsigned node);
 516 uint16_t mir_bytemask_of_read_components(midgard_instruction *ins, unsigned node);
 517 unsigned mir_ubo_shift(midgard_load_store_op op);
 518 midgard_reg_mode mir_typesize(midgard_instruction *ins);
 519 midgard_reg_mode mir_srcsize(midgard_instruction *ins, unsigned i);
 520 unsigned mir_bytes_for_mode(midgard_reg_mode mode);
 521 uint16_t mir_from_bytemask(uint16_t bytemask, midgard_reg_mode mode);
 522 uint16_t mir_bytemask(midgard_instruction *ins);
 523 uint16_t mir_round_bytemask_down(uint16_t mask, midgard_reg_mode mode);
 524 void mir_set_bytemask(midgard_instruction *ins, uint16_t bytemask);
 525
 526 /* MIR printing */
 527
 528 void mir_print_instruction(midgard_instruction *ins);
 529 void mir_print_bundle(midgard_bundle *ctx);
 530 void mir_print_block(midgard_block *block);
 531 void mir_print_shader(compiler_context *ctx);
 532 bool mir_nontrivial_source2_mod(midgard_instruction *ins);
 533 bool mir_nontrivial_source2_mod_simple(midgard_instruction *ins);
 534 bool mir_nontrivial_outmod(midgard_instruction *ins);
 535
 536 void mir_insert_instruction_before_scheduled(compiler_context *ctx, midgard_block *block, midgard_instruction *tag, midgard_instruction ins);
 537 void mir_insert_instruction_after_scheduled(compiler_context *ctx, midgard_block *block, midgard_instruction *tag, midgard_instruction ins);
 538 void mir_flip(midgard_instruction *ins);
 539 void mir_compute_temp_count(compiler_context *ctx);
 540
 541 /* 'Intrinsic' move for aliasing */
 542
 543 static inline midgard_instruction
 544 v_mov(unsigned src, unsigned dest)
 545 {
 546         midgard_instruction ins = {
 547                 .type = TAG_ALU_4,
 548                 .mask = 0xF,
 549                 .src = { SSA_UNUSED, src, SSA_UNUSED },
 550                 .swizzle = SWIZZLE_IDENTITY,
 551                 .dest = dest,
 552                 .alu = {
 553                         .op = midgard_alu_op_imov,
 554                         .reg_mode = midgard_reg_mode_32,
 555                         .dest_override = midgard_dest_override_none,
 556                         .outmod = midgard_outmod_int_wrap
 557                 },
 558         };
 559
 560         return ins;
 561 }
 562
 563 static inline bool
 564 mir_has_arg(midgard_instruction *ins, unsigned arg)
 565 {
 566         if (!ins)
 567                 return false;
 568
 569         for (unsigned i = 0; i < ARRAY_SIZE(ins->src); ++i) {
 570                 if (ins->src[i] == arg)
 571                         return true;
 572         }
 573
 574         return false;
 575 }
 576
 577 /* Scheduling */
 578
 579 void schedule_program(compiler_context *ctx);
 580
 581 /* Register allocation */
 582
 583 struct ra_graph;
 584
 585 /* Broad types of register classes so we can handle special
 586  * registers */
 587
 588 #define NR_REG_CLASSES 6
 589
 590 #define REG_CLASS_WORK          0
 591 #define REG_CLASS_LDST          1
 592 #define REG_CLASS_LDST27        2
 593 #define REG_CLASS_TEXR          3
 594 #define REG_CLASS_TEXW          4
 595 #define REG_CLASS_FRAGC         5
 596
 597 void mir_lower_special_reads(compiler_context *ctx);
 598 struct ra_graph* allocate_registers(compiler_context *ctx, bool *spilled);
 599 void install_registers(compiler_context *ctx, struct ra_graph *g);
 600 void mir_liveness_ins_update(uint16_t *live, midgard_instruction *ins, unsigned max);
 601 void mir_compute_liveness(compiler_context *ctx);
 602 void mir_invalidate_liveness(compiler_context *ctx);
 603 bool mir_is_live_after(compiler_context *ctx, midgard_block *block, midgard_instruction *start, int src);
 604
 605 void mir_create_pipeline_registers(compiler_context *ctx);
 606
 607 void
 608 midgard_promote_uniforms(compiler_context *ctx, unsigned promoted_count);
 609
 610 midgard_instruction *
 611 emit_ubo_read(
 612         compiler_context *ctx,
 613         nir_instr *instr,
 614         unsigned dest,
 615         unsigned offset,
 616         nir_src *indirect_offset,
 617         unsigned index);
 618
 619 void
 620 emit_sysval_read(compiler_context *ctx, nir_instr *instr, signed dest_override, unsigned nr_components);
 621
 622 void
 623 midgard_emit_derivatives(compiler_context *ctx, nir_alu_instr *instr);
 624
 625 void
 626 midgard_lower_derivatives(compiler_context *ctx, midgard_block *block);
 627
 628 bool mir_op_computes_derivatives(unsigned op);
 629
 630 /* Final emission */
 631
 632 void emit_binary_bundle(
 633         compiler_context *ctx,
 634         midgard_bundle *bundle,
 635         struct util_dynarray *emission,
 636         int next_tag);
 637
 638 bool
 639 nir_undef_to_zero(nir_shader *shader);
 640
 641 /* Optimizations */
 642
 643 bool midgard_opt_copy_prop(compiler_context *ctx, midgard_block *block);
 644 bool midgard_opt_combine_projection(compiler_context *ctx, midgard_block *block);
 645 bool midgard_opt_varying_projection(compiler_context *ctx, midgard_block *block);
 646 bool midgard_opt_dead_code_eliminate(compiler_context *ctx, midgard_block *block);
 647 bool midgard_opt_dead_move_eliminate(compiler_context *ctx, midgard_block *block);
 648
 649 void midgard_lower_invert(compiler_context *ctx, midgard_block *block);
 650 bool midgard_opt_not_propagate(compiler_context *ctx, midgard_block *block);
 651 bool midgard_opt_fuse_src_invert(compiler_context *ctx, midgard_block *block);
 652 bool midgard_opt_fuse_dest_invert(compiler_context *ctx, midgard_block *block);
 653 bool midgard_opt_csel_invert(compiler_context *ctx, midgard_block *block);
 654 bool midgard_opt_promote_fmov(compiler_context *ctx, midgard_block *block);
 655
 656 #endif