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 #include "midgard_ops.h"
  31
  32 #include "util/hash_table.h"
  33 #include "util/u_dynarray.h"
  34 #include "util/set.h"
  35 #include "util/list.h"
  36
  37 #include "main/mtypes.h"
  38 #include "compiler/nir_types.h"
  39 #include "compiler/nir/nir.h"
  40 #include "panfrost/util/pan_ir.h"
  41 #include "panfrost/util/lcra.h"
  42
  43 /* Forward declare */
  44 struct midgard_block;
  45
  46 /* Target types. Defaults to TARGET_GOTO (the type corresponding directly to
  47  * the hardware), hence why that must be zero. TARGET_DISCARD signals this
  48  * instruction is actually a discard op. */
  49
  50 #define TARGET_GOTO 0
  51 #define TARGET_BREAK 1
  52 #define TARGET_CONTINUE 2
  53 #define TARGET_DISCARD 3
  54
  55 typedef struct midgard_branch {
  56         /* If conditional, the condition is specified in r31.w */
  57         bool conditional;
  58
  59         /* For conditionals, if this is true, we branch on FALSE. If false, we  branch on TRUE. */
  60         bool invert_conditional;
  61
  62         /* Branch targets: the start of a block, the start of a loop (continue), the end of a loop (break). Value is one of TARGET_ */
  63         unsigned target_type;
  64
  65         /* The actual target */
  66         union {
  67                 int target_block;
  68                 int target_break;
  69                 int target_continue;
  70         };
  71 } midgard_branch;
  72
  73 /* Generic in-memory data type repesenting a single logical instruction, rather
  74  * than a single instruction group. This is the preferred form for code gen.
  75  * Multiple midgard_insturctions will later be combined during scheduling,
  76  * though this is not represented in this structure.  Its format bridges
  77  * the low-level binary representation with the higher level semantic meaning.
  78  *
  79  * Notably, it allows registers to be specified as block local SSA, for code
  80  * emitted before the register allocation pass.
  81  */
  82
  83 #define MIR_SRC_COUNT 4
  84 #define MIR_VEC_COMPONENTS 16
  85
  86 typedef struct midgard_instruction {
  87         /* Must be first for casting */
  88         struct list_head link;
  89
  90         unsigned type; /* ALU, load/store, texture */
  91
  92         /* Instruction arguments represented as block-local SSA
  93          * indices, rather than registers. ~0 means unused. */
  94         unsigned src[MIR_SRC_COUNT];
  95         unsigned dest;
  96
  97         /* vec16 swizzle, unpacked, per source */
  98         unsigned swizzle[MIR_SRC_COUNT][MIR_VEC_COMPONENTS];
  99
 100         /* Types! */
 101         nir_alu_type src_types[MIR_SRC_COUNT];
 102         nir_alu_type dest_type;
 103
 104         /* Special fields for an ALU instruction */
 105         midgard_reg_info registers;
 106
 107         /* For textures: should helpers execute this instruction (instead of
 108          * just helping with derivatives)? Should helpers terminate after? */
 109         bool helper_terminate;
 110         bool helper_execute;
 111
 112         /* I.e. (1 << alu_bit) */
 113         int unit;
 114
 115         bool has_constants;
 116         midgard_constants constants;
 117         uint16_t inline_constant;
 118         bool has_blend_constant;
 119         bool has_inline_constant;
 120
 121         bool compact_branch;
 122         bool writeout;
 123         bool writeout_depth;
 124         bool writeout_stencil;
 125         bool last_writeout;
 126
 127         /* Masks in a saneish format. One bit per channel, not packed fancy.
 128          * Use this instead of the op specific ones, and switch over at emit
 129          * time */
 130
 131         uint16_t mask;
 132
 133         /* For ALU ops only: set to true to invert (bitwise NOT) the
 134          * destination of an integer-out op. Not implemented in hardware but
 135          * allows more optimizations */
 136
 137         bool invert;
 138
 139         /* Hint for the register allocator not to spill the destination written
 140          * from this instruction (because it is a spill/unspill node itself).
 141          * Bitmask of spilled classes */
 142
 143         unsigned no_spill;
 144
 145         /* Generic hint for intra-pass use */
 146         bool hint;
 147
 148         /* During scheduling, the backwards dependency graph
 149          * (DAG). nr_dependencies is the number of unscheduled
 150          * instructions that must still be scheduled after
 151          * (before) this instruction. dependents are which
 152          * instructions need to be scheduled before (after) this
 153          * instruction. */
 154
 155         unsigned nr_dependencies;
 156         BITSET_WORD *dependents;
 157
 158         /* For load/store ops.. force 64-bit destination */
 159         bool load_64;
 160
 161         union {
 162                 midgard_load_store_word load_store;
 163                 midgard_vector_alu alu;
 164                 midgard_texture_word texture;
 165                 midgard_branch_extended branch_extended;
 166                 uint16_t br_compact;
 167
 168                 /* General branch, rather than packed br_compact. Higher level
 169                  * than the other components */
 170                 midgard_branch branch;
 171         };
 172 } midgard_instruction;
 173
 174 typedef struct midgard_block {
 175         pan_block base;
 176
 177         bool scheduled;
 178
 179         /* List of midgard_bundles emitted (after the scheduler has run) */
 180         struct util_dynarray bundles;
 181
 182         /* Number of quadwords _actually_ emitted, as determined after scheduling */
 183         unsigned quadword_count;
 184
 185         /* Indicates this is a fixed-function fragment epilogue block */
 186         bool epilogue;
 187
 188         /* Are helper invocations required by this block? */
 189         bool helpers_in;
 190 } midgard_block;
 191
 192 typedef struct midgard_bundle {
 193         /* Tag for the overall bundle */
 194         int tag;
 195
 196         /* Instructions contained by the bundle. instruction_count <= 6 (vmul,
 197          * sadd, vadd, smul, vlut, branch) */
 198         int instruction_count;
 199         midgard_instruction *instructions[6];
 200
 201         /* Bundle-wide ALU configuration */
 202         int padding;
 203         int control;
 204         bool has_embedded_constants;
 205         midgard_constants constants;
 206         bool has_blend_constant;
 207         bool last_writeout;
 208 } midgard_bundle;
 209
 210 enum midgard_rt_id {
 211         MIDGARD_COLOR_RT0,
 212         MIDGARD_COLOR_RT1,
 213         MIDGARD_COLOR_RT2,
 214         MIDGARD_COLOR_RT3,
 215         MIDGARD_ZS_RT,
 216         MIDGARD_NUM_RTS,
 217 };
 218
 219 typedef struct compiler_context {
 220         nir_shader *nir;
 221         gl_shader_stage stage;
 222
 223         /* Is internally a blend shader? Depends on stage == FRAGMENT */
 224         bool is_blend;
 225
 226         /* Render target number for a keyed blend shader. Depends on is_blend */
 227         unsigned blend_rt;
 228
 229         /* Tracking for blend constant patching */
 230         int blend_constant_offset;
 231
 232         /* Number of bytes used for Thread Local Storage */
 233         unsigned tls_size;
 234
 235         /* Count of spills and fills for shaderdb */
 236         unsigned spills;
 237         unsigned fills;
 238
 239         /* Current NIR function */
 240         nir_function *func;
 241
 242         /* Allocated compiler temporary counter */
 243         unsigned temp_alloc;
 244
 245         /* Unordered list of midgard_blocks */
 246         int block_count;
 247         struct list_head blocks;
 248
 249         /* TODO merge with block_count? */
 250         unsigned block_source_count;
 251
 252         /* List of midgard_instructions emitted for the current block */
 253         midgard_block *current_block;
 254
 255         /* If there is a preset after block, use this, otherwise emit_block will create one if NULL */
 256         midgard_block *after_block;
 257
 258         /* The current "depth" of the loop, for disambiguating breaks/continues
 259          * when using nested loops */
 260         int current_loop_depth;
 261
 262         /* Total number of loops for shader-db */
 263         unsigned loop_count;
 264
 265         /* Constants which have been loaded, for later inlining */
 266         struct hash_table_u64 *ssa_constants;
 267
 268         /* Mapping of hashes computed from NIR indices to the sequential temp indices ultimately used in MIR */
 269         struct hash_table_u64 *hash_to_temp;
 270         int temp_count;
 271         int max_hash;
 272
 273         /* Set of NIR indices that were already emitted as outmods */
 274         BITSET_WORD *already_emitted;
 275
 276         /* Just the count of the max register used. Higher count => higher
 277          * register pressure */
 278         int work_registers;
 279
 280         /* The number of uniforms allowable for the fast path */
 281         int uniform_cutoff;
 282
 283         /* Count of instructions emitted from NIR overall, across all blocks */
 284         int instruction_count;
 285
 286         /* Alpha ref value passed in */
 287         float alpha_ref;
 288
 289         unsigned quadword_count;
 290
 291         /* Bitmask of valid metadata */
 292         unsigned metadata;
 293
 294         /* Model-specific quirk set */
 295         uint32_t quirks;
 296
 297         /* Writeout instructions for each render target */
 298         midgard_instruction *writeout_branch[MIDGARD_NUM_RTS];
 299
 300         struct panfrost_sysvals sysvals;
 301 } compiler_context;
 302
 303 /* Per-block live_in/live_out */
 304 #define MIDGARD_METADATA_LIVENESS (1 << 0)
 305
 306 /* Helpers for manipulating the above structures (forming the driver IR) */
 307
 308 /* Append instruction to end of current block */
 309
 310 static inline midgard_instruction *
 311 mir_upload_ins(struct compiler_context *ctx, struct midgard_instruction ins)
 312 {
 313         midgard_instruction *heap = ralloc(ctx, struct midgard_instruction);
 314         memcpy(heap, &ins, sizeof(ins));
 315         return heap;
 316 }
 317
 318 static inline midgard_instruction *
 319 emit_mir_instruction(struct compiler_context *ctx, struct midgard_instruction ins)
 320 {
 321         midgard_instruction *u = mir_upload_ins(ctx, ins);
 322         list_addtail(&u->link, &ctx->current_block->base.instructions);
 323         return u;
 324 }
 325
 326 static inline struct midgard_instruction *
 327 mir_insert_instruction_before(struct compiler_context *ctx,
 328                               struct midgard_instruction *tag,
 329                               struct midgard_instruction ins)
 330 {
 331         struct midgard_instruction *u = mir_upload_ins(ctx, ins);
 332         list_addtail(&u->link, &tag->link);
 333         return u;
 334 }
 335
 336 static inline void
 337 mir_remove_instruction(struct midgard_instruction *ins)
 338 {
 339         list_del(&ins->link);
 340 }
 341
 342 static inline midgard_instruction*
 343 mir_prev_op(struct midgard_instruction *ins)
 344 {
 345         return list_last_entry(&(ins->link), midgard_instruction, link);
 346 }
 347
 348 static inline midgard_instruction*
 349 mir_next_op(struct midgard_instruction *ins)
 350 {
 351         return list_first_entry(&(ins->link), midgard_instruction, link);
 352 }
 353
 354 #define mir_foreach_block(ctx, v) \
 355         list_for_each_entry(pan_block, v, &ctx->blocks, link)
 356
 357 #define mir_foreach_block_from(ctx, from, v) \
 358         list_for_each_entry_from(pan_block, v, &from->base, &ctx->blocks, link)
 359
 360 #define mir_foreach_instr_in_block(block, v) \
 361         list_for_each_entry(struct midgard_instruction, v, &block->base.instructions, link)
 362 #define mir_foreach_instr_in_block_rev(block, v) \
 363         list_for_each_entry_rev(struct midgard_instruction, v, &block->base.instructions, link)
 364
 365 #define mir_foreach_instr_in_block_safe(block, v) \
 366         list_for_each_entry_safe(struct midgard_instruction, v, &block->base.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->base.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->base.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->base.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 = (i >= 0) ? _bundle->instructions[i] : NULL) \
 390
 391 #define mir_foreach_instr_global(ctx, v) \
 392         mir_foreach_block(ctx, v_block) \
 393                 mir_foreach_instr_in_block(((midgard_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(((midgard_block *) v_block), v)
 398
 399 /* Based on set_foreach, expanded with automatic type casts */
 400
 401 #define mir_foreach_predecessor(blk, v) \
 402         struct set_entry *_entry_##v; \
 403         struct midgard_block *v; \
 404         for (_entry_##v = _mesa_set_next_entry(blk->base.predecessors, NULL), \
 405                 v = (struct midgard_block *) (_entry_##v ? _entry_##v->key : NULL);  \
 406                 _entry_##v != NULL; \
 407                 _entry_##v = _mesa_set_next_entry(blk->base.predecessors, _entry_##v), \
 408                 v = (struct midgard_block *) (_entry_##v ? _entry_##v->key : NULL))
 409
 410 #define mir_foreach_src(ins, v) \
 411         for (unsigned v = 0; v < ARRAY_SIZE(ins->src); ++v)
 412
 413 static inline midgard_instruction *
 414 mir_last_in_block(struct midgard_block *block)
 415 {
 416         return list_last_entry(&block->base.instructions, struct midgard_instruction, link);
 417 }
 418
 419 static inline midgard_block *
 420 mir_get_block(compiler_context *ctx, int idx)
 421 {
 422         struct list_head *lst = &ctx->blocks;
 423
 424         while ((idx--) + 1)
 425                 lst = lst->next;
 426
 427         return (struct midgard_block *) lst;
 428 }
 429
 430 static inline bool
 431 mir_is_alu_bundle(midgard_bundle *bundle)
 432 {
 433         return IS_ALU(bundle->tag);
 434 }
 435
 436 static inline unsigned
 437 make_compiler_temp(compiler_context *ctx)
 438 {
 439         return (ctx->func->impl->ssa_alloc + ctx->temp_alloc++) << 1;
 440 }
 441
 442 static inline unsigned
 443 make_compiler_temp_reg(compiler_context *ctx)
 444 {
 445         return ((ctx->func->impl->reg_alloc + ctx->temp_alloc++) << 1) | PAN_IS_REG;
 446 }
 447
 448 static inline unsigned
 449 nir_ssa_index(nir_ssa_def *ssa)
 450 {
 451         return (ssa->index << 1) | 0;
 452 }
 453
 454 static inline unsigned
 455 nir_src_index(compiler_context *ctx, nir_src *src)
 456 {
 457         if (src->is_ssa)
 458                 return nir_ssa_index(src->ssa);
 459         else {
 460                 assert(!src->reg.indirect);
 461                 return (src->reg.reg->index << 1) | PAN_IS_REG;
 462         }
 463 }
 464
 465 static inline unsigned
 466 nir_dest_index(nir_dest *dst)
 467 {
 468         if (dst->is_ssa)
 469                 return (dst->ssa.index << 1) | 0;
 470         else {
 471                 assert(!dst->reg.indirect);
 472                 return (dst->reg.reg->index << 1) | PAN_IS_REG;
 473         }
 474 }
 475
 476
 477
 478 /* MIR manipulation */
 479
 480 void mir_rewrite_index(compiler_context *ctx, unsigned old, unsigned new);
 481 void mir_rewrite_index_src(compiler_context *ctx, unsigned old, unsigned new);
 482 void mir_rewrite_index_dst(compiler_context *ctx, unsigned old, unsigned new);
 483 void mir_rewrite_index_dst_single(midgard_instruction *ins, unsigned old, unsigned new);
 484 void mir_rewrite_index_src_single(midgard_instruction *ins, unsigned old, unsigned new);
 485 void mir_rewrite_index_src_swizzle(compiler_context *ctx, unsigned old, unsigned new, unsigned *swizzle);
 486 bool mir_single_use(compiler_context *ctx, unsigned value);
 487 bool mir_special_index(compiler_context *ctx, unsigned idx);
 488 unsigned mir_use_count(compiler_context *ctx, unsigned value);
 489 bool mir_is_written_before(compiler_context *ctx, midgard_instruction *ins, unsigned node);
 490 uint16_t mir_bytemask_of_read_components(midgard_instruction *ins, unsigned node);
 491 uint16_t mir_bytemask_of_read_components_index(midgard_instruction *ins, unsigned i);
 492 midgard_reg_mode mir_typesize(midgard_instruction *ins);
 493 midgard_reg_mode mir_srcsize(midgard_instruction *ins, unsigned i);
 494 unsigned mir_bytes_for_mode(midgard_reg_mode mode);
 495 midgard_reg_mode mir_mode_for_destsize(unsigned size);
 496 uint16_t mir_from_bytemask(uint16_t bytemask, midgard_reg_mode mode);
 497 uint16_t mir_bytemask(midgard_instruction *ins);
 498 uint16_t mir_round_bytemask_up(uint16_t mask, midgard_reg_mode mode);
 499 void mir_set_bytemask(midgard_instruction *ins, uint16_t bytemask);
 500 unsigned mir_upper_override(midgard_instruction *ins);
 501
 502 /* MIR printing */
 503
 504 void mir_print_instruction(midgard_instruction *ins);
 505 void mir_print_bundle(midgard_bundle *ctx);
 506 void mir_print_block(midgard_block *block);
 507 void mir_print_shader(compiler_context *ctx);
 508 bool mir_nontrivial_source2_mod(midgard_instruction *ins);
 509 bool mir_nontrivial_source2_mod_simple(midgard_instruction *ins);
 510 bool mir_nontrivial_outmod(midgard_instruction *ins);
 511
 512 void mir_insert_instruction_before_scheduled(compiler_context *ctx, midgard_block *block, midgard_instruction *tag, midgard_instruction ins);
 513 void mir_insert_instruction_after_scheduled(compiler_context *ctx, midgard_block *block, midgard_instruction *tag, midgard_instruction ins);
 514 void mir_flip(midgard_instruction *ins);
 515 void mir_compute_temp_count(compiler_context *ctx);
 516
 517 void mir_set_offset(compiler_context *ctx, midgard_instruction *ins, nir_src *offset, bool is_shared);
 518
 519 /* 'Intrinsic' move for aliasing */
 520
 521 static inline midgard_instruction
 522 v_mov(unsigned src, unsigned dest)
 523 {
 524         midgard_instruction ins = {
 525                 .type = TAG_ALU_4,
 526                 .mask = 0xF,
 527                 .src = { ~0, src, ~0, ~0 },
 528                 .src_types = { 0, nir_type_uint32 },
 529                 .swizzle = SWIZZLE_IDENTITY,
 530                 .dest = dest,
 531                 .dest_type = nir_type_uint32,
 532                 .alu = {
 533                         .op = midgard_alu_op_imov,
 534                         .reg_mode = midgard_reg_mode_32,
 535                         .dest_override = midgard_dest_override_none,
 536                         .outmod = midgard_outmod_int_wrap
 537                 },
 538         };
 539
 540         return ins;
 541 }
 542
 543 /* Broad types of register classes so we can handle special
 544  * registers */
 545
 546 #define REG_CLASS_WORK          0
 547 #define REG_CLASS_LDST          1
 548 #define REG_CLASS_TEXR          3
 549 #define REG_CLASS_TEXW          4
 550
 551 /* Like a move, but to thread local storage! */
 552
 553 static inline midgard_instruction
 554 v_load_store_scratch(
 555                 unsigned srcdest,
 556                 unsigned index,
 557                 bool is_store,
 558                 unsigned mask)
 559 {
 560         /* We index by 32-bit vec4s */
 561         unsigned byte = (index * 4 * 4);
 562
 563         midgard_instruction ins = {
 564                 .type = TAG_LOAD_STORE_4,
 565                 .mask = mask,
 566                 .dest = ~0,
 567                 .src = { ~0, ~0, ~0, ~0 },
 568                 .swizzle = SWIZZLE_IDENTITY_4,
 569                 .load_store = {
 570                         .op = is_store ? midgard_op_st_int4 : midgard_op_ld_int4,
 571
 572                         /* For register spilling - to thread local storage */
 573                         .arg_1 = 0xEA,
 574                         .arg_2 = 0x1E,
 575                 },
 576
 577                 /* If we spill an unspill, RA goes into an infinite loop */
 578                 .no_spill = (1 << REG_CLASS_WORK)
 579         };
 580
 581         ins.constants.u32[0] = byte;
 582
 583         if (is_store) {
 584                 ins.src[0] = srcdest;
 585
 586                 /* Ensure we are tightly swizzled so liveness analysis is
 587                  * correct */
 588
 589                 for (unsigned i = 0; i < 4; ++i) {
 590                         if (!(mask & (1 << i)))
 591                                 ins.swizzle[0][i] = COMPONENT_X;
 592                 }
 593         } else
 594                 ins.dest = srcdest;
 595
 596         return ins;
 597 }
 598
 599 static inline bool
 600 mir_has_arg(midgard_instruction *ins, unsigned arg)
 601 {
 602         if (!ins)
 603                 return false;
 604
 605         mir_foreach_src(ins, i) {
 606                 if (ins->src[i] == arg)
 607                         return true;
 608         }
 609
 610         return false;
 611 }
 612
 613 /* Scheduling */
 614
 615 void midgard_schedule_program(compiler_context *ctx);
 616
 617 void mir_ra(compiler_context *ctx);
 618 void mir_squeeze_index(compiler_context *ctx);
 619 void mir_lower_special_reads(compiler_context *ctx);
 620 void mir_liveness_ins_update(uint16_t *live, midgard_instruction *ins, unsigned max);
 621 void mir_compute_liveness(compiler_context *ctx);
 622 void mir_invalidate_liveness(compiler_context *ctx);
 623 bool mir_is_live_after(compiler_context *ctx, midgard_block *block, midgard_instruction *start, int src);
 624
 625 void mir_create_pipeline_registers(compiler_context *ctx);
 626 void midgard_promote_uniforms(compiler_context *ctx);
 627
 628 void
 629 midgard_emit_derivatives(compiler_context *ctx, nir_alu_instr *instr);
 630
 631 void
 632 midgard_lower_derivatives(compiler_context *ctx, midgard_block *block);
 633
 634 bool mir_op_computes_derivatives(gl_shader_stage stage, unsigned op);
 635
 636 void mir_analyze_helper_terminate(compiler_context *ctx);
 637 void mir_analyze_helper_requirements(compiler_context *ctx);
 638
 639 /* Final emission */
 640
 641 void emit_binary_bundle(
 642         compiler_context *ctx,
 643         midgard_bundle *bundle,
 644         struct util_dynarray *emission,
 645         int next_tag);
 646
 647 bool
 648 nir_undef_to_zero(nir_shader *shader);
 649
 650 void midgard_nir_lod_errata(nir_shader *shader);
 651
 652 /* Optimizations */
 653
 654 bool midgard_opt_copy_prop(compiler_context *ctx, midgard_block *block);
 655 bool midgard_opt_combine_projection(compiler_context *ctx, midgard_block *block);
 656 bool midgard_opt_varying_projection(compiler_context *ctx, midgard_block *block);
 657 bool midgard_opt_dead_code_eliminate(compiler_context *ctx, midgard_block *block);
 658 bool midgard_opt_dead_move_eliminate(compiler_context *ctx, midgard_block *block);
 659
 660 void midgard_lower_invert(compiler_context *ctx, midgard_block *block);
 661 bool midgard_opt_not_propagate(compiler_context *ctx, midgard_block *block);
 662 bool midgard_opt_fuse_src_invert(compiler_context *ctx, midgard_block *block);
 663 bool midgard_opt_fuse_dest_invert(compiler_context *ctx, midgard_block *block);
 664 bool midgard_opt_csel_invert(compiler_context *ctx, midgard_block *block);
 665 bool midgard_opt_promote_fmov(compiler_context *ctx, midgard_block *block);
 666 bool midgard_opt_drop_cmp_invert(compiler_context *ctx, midgard_block *block);
 667 bool midgard_opt_invert_branch(compiler_context *ctx, midgard_block *block);
 668
 669 #endif