src/compiler/nir/nir.c

   1 /*
   2  * Copyright © 2014 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  *    Connor Abbott (cwabbott0@gmail.com)
  25  *
  26  */
  27
  28 #include "nir.h"
  29 #include "nir_builder.h"
  30 #include "nir_control_flow_private.h"
  31 #include "util/half_float.h"
  32 #include <limits.h>
  33 #include <assert.h>
  34 #include <math.h>
  35 #include "util/u_math.h"
  36
  37 #include "main/menums.h" /* BITFIELD64_MASK */
  38
  39 nir_shader *
  40 nir_shader_create(void *mem_ctx,
  41                   gl_shader_stage stage,
  42                   const nir_shader_compiler_options *options,
  43                   shader_info *si)
  44 {
  45    nir_shader *shader = rzalloc(mem_ctx, nir_shader);
  46
  47    exec_list_make_empty(&shader->uniforms);
  48    exec_list_make_empty(&shader->inputs);
  49    exec_list_make_empty(&shader->outputs);
  50    exec_list_make_empty(&shader->shared);
  51
  52    shader->options = options;
  53
  54    if (si) {
  55       assert(si->stage == stage);
  56       shader->info = *si;
  57    } else {
  58       shader->info.stage = stage;
  59    }
  60
  61    exec_list_make_empty(&shader->functions);
  62    exec_list_make_empty(&shader->globals);
  63    exec_list_make_empty(&shader->system_values);
  64
  65    shader->num_inputs = 0;
  66    shader->num_outputs = 0;
  67    shader->num_uniforms = 0;
  68    shader->num_shared = 0;
  69
  70    return shader;
  71 }
  72
  73 static nir_register *
  74 reg_create(void *mem_ctx, struct exec_list *list)
  75 {
  76    nir_register *reg = ralloc(mem_ctx, nir_register);
  77
  78    list_inithead(&reg->uses);
  79    list_inithead(&reg->defs);
  80    list_inithead(&reg->if_uses);
  81
  82    reg->num_components = 0;
  83    reg->bit_size = 32;
  84    reg->num_array_elems = 0;
  85    reg->name = NULL;
  86
  87    exec_list_push_tail(list, &reg->node);
  88
  89    return reg;
  90 }
  91
  92 nir_register *
  93 nir_local_reg_create(nir_function_impl *impl)
  94 {
  95    nir_register *reg = reg_create(ralloc_parent(impl), &impl->registers);
  96    reg->index = impl->reg_alloc++;
  97
  98    return reg;
  99 }
 100
 101 void
 102 nir_reg_remove(nir_register *reg)
 103 {
 104    exec_node_remove(&reg->node);
 105 }
 106
 107 void
 108 nir_shader_add_variable(nir_shader *shader, nir_variable *var)
 109 {
 110    switch (var->data.mode) {
 111    case nir_num_variable_modes:
 112    case nir_var_all:
 113       assert(!"invalid mode");
 114       break;
 115
 116    case nir_var_function_temp:
 117       assert(!"nir_shader_add_variable cannot be used for local variables");
 118       break;
 119
 120    case nir_var_shader_temp:
 121       exec_list_push_tail(&shader->globals, &var->node);
 122       break;
 123
 124    case nir_var_shader_in:
 125       exec_list_push_tail(&shader->inputs, &var->node);
 126       break;
 127
 128    case nir_var_shader_out:
 129       exec_list_push_tail(&shader->outputs, &var->node);
 130       break;
 131
 132    case nir_var_uniform:
 133    case nir_var_mem_ubo:
 134    case nir_var_mem_ssbo:
 135       exec_list_push_tail(&shader->uniforms, &var->node);
 136       break;
 137
 138    case nir_var_mem_shared:
 139       assert(gl_shader_stage_is_compute(shader->info.stage));
 140       exec_list_push_tail(&shader->shared, &var->node);
 141       break;
 142
 143    case nir_var_mem_global:
 144       assert(!"nir_shader_add_variable cannot be used for global memory");
 145       break;
 146
 147    case nir_var_system_value:
 148       exec_list_push_tail(&shader->system_values, &var->node);
 149       break;
 150
 151    case nir_var_mem_push_const:
 152       assert(!"nir_var_push_constant is not supposed to be used for variables");
 153       break;
 154    }
 155 }
 156
 157 nir_variable *
 158 nir_variable_create(nir_shader *shader, nir_variable_mode mode,
 159                     const struct glsl_type *type, const char *name)
 160 {
 161    nir_variable *var = rzalloc(shader, nir_variable);
 162    var->name = ralloc_strdup(var, name);
 163    var->type = type;
 164    var->data.mode = mode;
 165    var->data.how_declared = nir_var_declared_normally;
 166
 167    if ((mode == nir_var_shader_in &&
 168         shader->info.stage != MESA_SHADER_VERTEX) ||
 169        (mode == nir_var_shader_out &&
 170         shader->info.stage != MESA_SHADER_FRAGMENT))
 171       var->data.interpolation = INTERP_MODE_SMOOTH;
 172
 173    if (mode == nir_var_shader_in || mode == nir_var_uniform)
 174       var->data.read_only = true;
 175
 176    nir_shader_add_variable(shader, var);
 177
 178    return var;
 179 }
 180
 181 nir_variable *
 182 nir_local_variable_create(nir_function_impl *impl,
 183                           const struct glsl_type *type, const char *name)
 184 {
 185    nir_variable *var = rzalloc(impl->function->shader, nir_variable);
 186    var->name = ralloc_strdup(var, name);
 187    var->type = type;
 188    var->data.mode = nir_var_function_temp;
 189
 190    nir_function_impl_add_variable(impl, var);
 191
 192    return var;
 193 }
 194
 195 nir_function *
 196 nir_function_create(nir_shader *shader, const char *name)
 197 {
 198    nir_function *func = ralloc(shader, nir_function);
 199
 200    exec_list_push_tail(&shader->functions, &func->node);
 201
 202    func->name = ralloc_strdup(func, name);
 203    func->shader = shader;
 204    func->num_params = 0;
 205    func->params = NULL;
 206    func->impl = NULL;
 207    func->is_entrypoint = false;
 208
 209    return func;
 210 }
 211
 212 /* NOTE: if the instruction you are copying a src to is already added
 213  * to the IR, use nir_instr_rewrite_src() instead.
 214  */
 215 void nir_src_copy(nir_src *dest, const nir_src *src, void *mem_ctx)
 216 {
 217    dest->is_ssa = src->is_ssa;
 218    if (src->is_ssa) {
 219       dest->ssa = src->ssa;
 220    } else {
 221       dest->reg.base_offset = src->reg.base_offset;
 222       dest->reg.reg = src->reg.reg;
 223       if (src->reg.indirect) {
 224          dest->reg.indirect = ralloc(mem_ctx, nir_src);
 225          nir_src_copy(dest->reg.indirect, src->reg.indirect, mem_ctx);
 226       } else {
 227          dest->reg.indirect = NULL;
 228       }
 229    }
 230 }
 231
 232 void nir_dest_copy(nir_dest *dest, const nir_dest *src, nir_instr *instr)
 233 {
 234    /* Copying an SSA definition makes no sense whatsoever. */
 235    assert(!src->is_ssa);
 236
 237    dest->is_ssa = false;
 238
 239    dest->reg.base_offset = src->reg.base_offset;
 240    dest->reg.reg = src->reg.reg;
 241    if (src->reg.indirect) {
 242       dest->reg.indirect = ralloc(instr, nir_src);
 243       nir_src_copy(dest->reg.indirect, src->reg.indirect, instr);
 244    } else {
 245       dest->reg.indirect = NULL;
 246    }
 247 }
 248
 249 void
 250 nir_alu_src_copy(nir_alu_src *dest, const nir_alu_src *src,
 251                  nir_alu_instr *instr)
 252 {
 253    nir_src_copy(&dest->src, &src->src, &instr->instr);
 254    dest->abs = src->abs;
 255    dest->negate = src->negate;
 256    for (unsigned i = 0; i < NIR_MAX_VEC_COMPONENTS; i++)
 257       dest->swizzle[i] = src->swizzle[i];
 258 }
 259
 260 void
 261 nir_alu_dest_copy(nir_alu_dest *dest, const nir_alu_dest *src,
 262                   nir_alu_instr *instr)
 263 {
 264    nir_dest_copy(&dest->dest, &src->dest, &instr->instr);
 265    dest->write_mask = src->write_mask;
 266    dest->saturate = src->saturate;
 267 }
 268
 269
 270 static void
 271 cf_init(nir_cf_node *node, nir_cf_node_type type)
 272 {
 273    exec_node_init(&node->node);
 274    node->parent = NULL;
 275    node->type = type;
 276 }
 277
 278 nir_function_impl *
 279 nir_function_impl_create_bare(nir_shader *shader)
 280 {
 281    nir_function_impl *impl = ralloc(shader, nir_function_impl);
 282
 283    impl->function = NULL;
 284
 285    cf_init(&impl->cf_node, nir_cf_node_function);
 286
 287    exec_list_make_empty(&impl->body);
 288    exec_list_make_empty(&impl->registers);
 289    exec_list_make_empty(&impl->locals);
 290    impl->reg_alloc = 0;
 291    impl->ssa_alloc = 0;
 292    impl->valid_metadata = nir_metadata_none;
 293
 294    /* create start & end blocks */
 295    nir_block *start_block = nir_block_create(shader);
 296    nir_block *end_block = nir_block_create(shader);
 297    start_block->cf_node.parent = &impl->cf_node;
 298    end_block->cf_node.parent = &impl->cf_node;
 299    impl->end_block = end_block;
 300
 301    exec_list_push_tail(&impl->body, &start_block->cf_node.node);
 302
 303    start_block->successors[0] = end_block;
 304    _mesa_set_add(end_block->predecessors, start_block);
 305    return impl;
 306 }
 307
 308 nir_function_impl *
 309 nir_function_impl_create(nir_function *function)
 310 {
 311    assert(function->impl == NULL);
 312
 313    nir_function_impl *impl = nir_function_impl_create_bare(function->shader);
 314
 315    function->impl = impl;
 316    impl->function = function;
 317
 318    return impl;
 319 }
 320
 321 nir_block *
 322 nir_block_create(nir_shader *shader)
 323 {
 324    nir_block *block = rzalloc(shader, nir_block);
 325
 326    cf_init(&block->cf_node, nir_cf_node_block);
 327
 328    block->successors[0] = block->successors[1] = NULL;
 329    block->predecessors = _mesa_pointer_set_create(block);
 330    block->imm_dom = NULL;
 331    /* XXX maybe it would be worth it to defer allocation?  This
 332     * way it doesn't get allocated for shader refs that never run
 333     * nir_calc_dominance?  For example, state-tracker creates an
 334     * initial IR, clones that, runs appropriate lowering pass, passes
 335     * to driver which does common lowering/opt, and then stores ref
 336     * which is later used to do state specific lowering and futher
 337     * opt.  Do any of the references not need dominance metadata?
 338     */
 339    block->dom_frontier = _mesa_pointer_set_create(block);
 340
 341    exec_list_make_empty(&block->instr_list);
 342
 343    return block;
 344 }
 345
 346 static inline void
 347 src_init(nir_src *src)
 348 {
 349    src->is_ssa = false;
 350    src->reg.reg = NULL;
 351    src->reg.indirect = NULL;
 352    src->reg.base_offset = 0;
 353 }
 354
 355 nir_if *
 356 nir_if_create(nir_shader *shader)
 357 {
 358    nir_if *if_stmt = ralloc(shader, nir_if);
 359
 360    if_stmt->control = nir_selection_control_none;
 361
 362    cf_init(&if_stmt->cf_node, nir_cf_node_if);
 363    src_init(&if_stmt->condition);
 364
 365    nir_block *then = nir_block_create(shader);
 366    exec_list_make_empty(&if_stmt->then_list);
 367    exec_list_push_tail(&if_stmt->then_list, &then->cf_node.node);
 368    then->cf_node.parent = &if_stmt->cf_node;
 369
 370    nir_block *else_stmt = nir_block_create(shader);
 371    exec_list_make_empty(&if_stmt->else_list);
 372    exec_list_push_tail(&if_stmt->else_list, &else_stmt->cf_node.node);
 373    else_stmt->cf_node.parent = &if_stmt->cf_node;
 374
 375    return if_stmt;
 376 }
 377
 378 nir_loop *
 379 nir_loop_create(nir_shader *shader)
 380 {
 381    nir_loop *loop = rzalloc(shader, nir_loop);
 382
 383    cf_init(&loop->cf_node, nir_cf_node_loop);
 384
 385    nir_block *body = nir_block_create(shader);
 386    exec_list_make_empty(&loop->body);
 387    exec_list_push_tail(&loop->body, &body->cf_node.node);
 388    body->cf_node.parent = &loop->cf_node;
 389
 390    body->successors[0] = body;
 391    _mesa_set_add(body->predecessors, body);
 392
 393    return loop;
 394 }
 395
 396 static void
 397 instr_init(nir_instr *instr, nir_instr_type type)
 398 {
 399    instr->type = type;
 400    instr->block = NULL;
 401    exec_node_init(&instr->node);
 402 }
 403
 404 static void
 405 dest_init(nir_dest *dest)
 406 {
 407    dest->is_ssa = false;
 408    dest->reg.reg = NULL;
 409    dest->reg.indirect = NULL;
 410    dest->reg.base_offset = 0;
 411 }
 412
 413 static void
 414 alu_dest_init(nir_alu_dest *dest)
 415 {
 416    dest_init(&dest->dest);
 417    dest->saturate = false;
 418    dest->write_mask = 0xf;
 419 }
 420
 421 static void
 422 alu_src_init(nir_alu_src *src)
 423 {
 424    src_init(&src->src);
 425    src->abs = src->negate = false;
 426    for (int i = 0; i < NIR_MAX_VEC_COMPONENTS; ++i)
 427       src->swizzle[i] = i;
 428 }
 429
 430 nir_alu_instr *
 431 nir_alu_instr_create(nir_shader *shader, nir_op op)
 432 {
 433    unsigned num_srcs = nir_op_infos[op].num_inputs;
 434    /* TODO: don't use rzalloc */
 435    nir_alu_instr *instr =
 436       rzalloc_size(shader,
 437                    sizeof(nir_alu_instr) + num_srcs * sizeof(nir_alu_src));
 438
 439    instr_init(&instr->instr, nir_instr_type_alu);
 440    instr->op = op;
 441    alu_dest_init(&instr->dest);
 442    for (unsigned i = 0; i < num_srcs; i++)
 443       alu_src_init(&instr->src[i]);
 444
 445    return instr;
 446 }
 447
 448 nir_deref_instr *
 449 nir_deref_instr_create(nir_shader *shader, nir_deref_type deref_type)
 450 {
 451    nir_deref_instr *instr =
 452       rzalloc_size(shader, sizeof(nir_deref_instr));
 453
 454    instr_init(&instr->instr, nir_instr_type_deref);
 455
 456    instr->deref_type = deref_type;
 457    if (deref_type != nir_deref_type_var)
 458       src_init(&instr->parent);
 459
 460    if (deref_type == nir_deref_type_array ||
 461        deref_type == nir_deref_type_ptr_as_array)
 462       src_init(&instr->arr.index);
 463
 464    dest_init(&instr->dest);
 465
 466    return instr;
 467 }
 468
 469 nir_jump_instr *
 470 nir_jump_instr_create(nir_shader *shader, nir_jump_type type)
 471 {
 472    nir_jump_instr *instr = ralloc(shader, nir_jump_instr);
 473    instr_init(&instr->instr, nir_instr_type_jump);
 474    instr->type = type;
 475    return instr;
 476 }
 477
 478 nir_load_const_instr *
 479 nir_load_const_instr_create(nir_shader *shader, unsigned num_components,
 480                             unsigned bit_size)
 481 {
 482    nir_load_const_instr *instr =
 483       rzalloc_size(shader, sizeof(*instr) + num_components * sizeof(*instr->value));
 484    instr_init(&instr->instr, nir_instr_type_load_const);
 485
 486    nir_ssa_def_init(&instr->instr, &instr->def, num_components, bit_size, NULL);
 487
 488    return instr;
 489 }
 490
 491 nir_intrinsic_instr *
 492 nir_intrinsic_instr_create(nir_shader *shader, nir_intrinsic_op op)
 493 {
 494    unsigned num_srcs = nir_intrinsic_infos[op].num_srcs;
 495    /* TODO: don't use rzalloc */
 496    nir_intrinsic_instr *instr =
 497       rzalloc_size(shader,
 498                   sizeof(nir_intrinsic_instr) + num_srcs * sizeof(nir_src));
 499
 500    instr_init(&instr->instr, nir_instr_type_intrinsic);
 501    instr->intrinsic = op;
 502
 503    if (nir_intrinsic_infos[op].has_dest)
 504       dest_init(&instr->dest);
 505
 506    for (unsigned i = 0; i < num_srcs; i++)
 507       src_init(&instr->src[i]);
 508
 509    return instr;
 510 }
 511
 512 nir_call_instr *
 513 nir_call_instr_create(nir_shader *shader, nir_function *callee)
 514 {
 515    const unsigned num_params = callee->num_params;
 516    nir_call_instr *instr =
 517       rzalloc_size(shader, sizeof(*instr) +
 518                    num_params * sizeof(instr->params[0]));
 519
 520    instr_init(&instr->instr, nir_instr_type_call);
 521    instr->callee = callee;
 522    instr->num_params = num_params;
 523    for (unsigned i = 0; i < num_params; i++)
 524       src_init(&instr->params[i]);
 525
 526    return instr;
 527 }
 528
 529 static int8_t default_tg4_offsets[4][2] =
 530 {
 531    { 0, 1 },
 532    { 1, 1 },
 533    { 1, 0 },
 534    { 0, 0 },
 535 };
 536
 537 nir_tex_instr *
 538 nir_tex_instr_create(nir_shader *shader, unsigned num_srcs)
 539 {
 540    nir_tex_instr *instr = rzalloc(shader, nir_tex_instr);
 541    instr_init(&instr->instr, nir_instr_type_tex);
 542
 543    dest_init(&instr->dest);
 544
 545    instr->num_srcs = num_srcs;
 546    instr->src = ralloc_array(instr, nir_tex_src, num_srcs);
 547    for (unsigned i = 0; i < num_srcs; i++)
 548       src_init(&instr->src[i].src);
 549
 550    instr->texture_index = 0;
 551    instr->sampler_index = 0;
 552    memcpy(instr->tg4_offsets, default_tg4_offsets, sizeof(instr->tg4_offsets));
 553
 554    return instr;
 555 }
 556
 557 void
 558 nir_tex_instr_add_src(nir_tex_instr *tex,
 559                       nir_tex_src_type src_type,
 560                       nir_src src)
 561 {
 562    nir_tex_src *new_srcs = rzalloc_array(tex, nir_tex_src,
 563                                          tex->num_srcs + 1);
 564
 565    for (unsigned i = 0; i < tex->num_srcs; i++) {
 566       new_srcs[i].src_type = tex->src[i].src_type;
 567       nir_instr_move_src(&tex->instr, &new_srcs[i].src,
 568                          &tex->src[i].src);
 569    }
 570
 571    ralloc_free(tex->src);
 572    tex->src = new_srcs;
 573
 574    tex->src[tex->num_srcs].src_type = src_type;
 575    nir_instr_rewrite_src(&tex->instr, &tex->src[tex->num_srcs].src, src);
 576    tex->num_srcs++;
 577 }
 578
 579 void
 580 nir_tex_instr_remove_src(nir_tex_instr *tex, unsigned src_idx)
 581 {
 582    assert(src_idx < tex->num_srcs);
 583
 584    /* First rewrite the source to NIR_SRC_INIT */
 585    nir_instr_rewrite_src(&tex->instr, &tex->src[src_idx].src, NIR_SRC_INIT);
 586
 587    /* Now, move all of the other sources down */
 588    for (unsigned i = src_idx + 1; i < tex->num_srcs; i++) {
 589       tex->src[i-1].src_type = tex->src[i].src_type;
 590       nir_instr_move_src(&tex->instr, &tex->src[i-1].src, &tex->src[i].src);
 591    }
 592    tex->num_srcs--;
 593 }
 594
 595 bool
 596 nir_tex_instr_has_explicit_tg4_offsets(nir_tex_instr *tex)
 597 {
 598    if (tex->op != nir_texop_tg4)
 599       return false;
 600    return memcmp(tex->tg4_offsets, default_tg4_offsets,
 601                  sizeof(tex->tg4_offsets)) != 0;
 602 }
 603
 604 nir_phi_instr *
 605 nir_phi_instr_create(nir_shader *shader)
 606 {
 607    nir_phi_instr *instr = ralloc(shader, nir_phi_instr);
 608    instr_init(&instr->instr, nir_instr_type_phi);
 609
 610    dest_init(&instr->dest);
 611    exec_list_make_empty(&instr->srcs);
 612    return instr;
 613 }
 614
 615 nir_parallel_copy_instr *
 616 nir_parallel_copy_instr_create(nir_shader *shader)
 617 {
 618    nir_parallel_copy_instr *instr = ralloc(shader, nir_parallel_copy_instr);
 619    instr_init(&instr->instr, nir_instr_type_parallel_copy);
 620
 621    exec_list_make_empty(&instr->entries);
 622
 623    return instr;
 624 }
 625
 626 nir_ssa_undef_instr *
 627 nir_ssa_undef_instr_create(nir_shader *shader,
 628                            unsigned num_components,
 629                            unsigned bit_size)
 630 {
 631    nir_ssa_undef_instr *instr = ralloc(shader, nir_ssa_undef_instr);
 632    instr_init(&instr->instr, nir_instr_type_ssa_undef);
 633
 634    nir_ssa_def_init(&instr->instr, &instr->def, num_components, bit_size, NULL);
 635
 636    return instr;
 637 }
 638
 639 static nir_const_value
 640 const_value_float(double d, unsigned bit_size)
 641 {
 642    nir_const_value v;
 643    memset(&v, 0, sizeof(v));
 644    switch (bit_size) {
 645    case 16: v.u16 = _mesa_float_to_half(d);  break;
 646    case 32: v.f32 = d;                       break;
 647    case 64: v.f64 = d;                       break;
 648    default:
 649       unreachable("Invalid bit size");
 650    }
 651    return v;
 652 }
 653
 654 static nir_const_value
 655 const_value_int(int64_t i, unsigned bit_size)
 656 {
 657    nir_const_value v;
 658    memset(&v, 0, sizeof(v));
 659    switch (bit_size) {
 660    case 1:  v.b   = i & 1;  break;
 661    case 8:  v.i8  = i;  break;
 662    case 16: v.i16 = i;  break;
 663    case 32: v.i32 = i;  break;
 664    case 64: v.i64 = i;  break;
 665    default:
 666       unreachable("Invalid bit size");
 667    }
 668    return v;
 669 }
 670
 671 nir_const_value
 672 nir_alu_binop_identity(nir_op binop, unsigned bit_size)
 673 {
 674    const int64_t max_int = (1ull << (bit_size - 1)) - 1;
 675    const int64_t min_int = -max_int - 1;
 676    switch (binop) {
 677    case nir_op_iadd:
 678       return const_value_int(0, bit_size);
 679    case nir_op_fadd:
 680       return const_value_float(0, bit_size);
 681    case nir_op_imul:
 682       return const_value_int(1, bit_size);
 683    case nir_op_fmul:
 684       return const_value_float(1, bit_size);
 685    case nir_op_imin:
 686       return const_value_int(max_int, bit_size);
 687    case nir_op_umin:
 688       return const_value_int(~0ull, bit_size);
 689    case nir_op_fmin:
 690       return const_value_float(INFINITY, bit_size);
 691    case nir_op_imax:
 692       return const_value_int(min_int, bit_size);
 693    case nir_op_umax:
 694       return const_value_int(0, bit_size);
 695    case nir_op_fmax:
 696       return const_value_float(-INFINITY, bit_size);
 697    case nir_op_iand:
 698       return const_value_int(~0ull, bit_size);
 699    case nir_op_ior:
 700       return const_value_int(0, bit_size);
 701    case nir_op_ixor:
 702       return const_value_int(0, bit_size);
 703    default:
 704       unreachable("Invalid reduction operation");
 705    }
 706 }
 707
 708 nir_function_impl *
 709 nir_cf_node_get_function(nir_cf_node *node)
 710 {
 711    while (node->type != nir_cf_node_function) {
 712       node = node->parent;
 713    }
 714
 715    return nir_cf_node_as_function(node);
 716 }
 717
 718 /* Reduces a cursor by trying to convert everything to after and trying to
 719  * go up to block granularity when possible.
 720  */
 721 static nir_cursor
 722 reduce_cursor(nir_cursor cursor)
 723 {
 724    switch (cursor.option) {
 725    case nir_cursor_before_block:
 726       assert(nir_cf_node_prev(&cursor.block->cf_node) == NULL ||
 727              nir_cf_node_prev(&cursor.block->cf_node)->type != nir_cf_node_block);
 728       if (exec_list_is_empty(&cursor.block->instr_list)) {
 729          /* Empty block.  After is as good as before. */
 730          cursor.option = nir_cursor_after_block;
 731       }
 732       return cursor;
 733
 734    case nir_cursor_after_block:
 735       return cursor;
 736
 737    case nir_cursor_before_instr: {
 738       nir_instr *prev_instr = nir_instr_prev(cursor.instr);
 739       if (prev_instr) {
 740          /* Before this instruction is after the previous */
 741          cursor.instr = prev_instr;
 742          cursor.option = nir_cursor_after_instr;
 743       } else {
 744          /* No previous instruction.  Switch to before block */
 745          cursor.block = cursor.instr->block;
 746          cursor.option = nir_cursor_before_block;
 747       }
 748       return reduce_cursor(cursor);
 749    }
 750
 751    case nir_cursor_after_instr:
 752       if (nir_instr_next(cursor.instr) == NULL) {
 753          /* This is the last instruction, switch to after block */
 754          cursor.option = nir_cursor_after_block;
 755          cursor.block = cursor.instr->block;
 756       }
 757       return cursor;
 758
 759    default:
 760       unreachable("Inavlid cursor option");
 761    }
 762 }
 763
 764 bool
 765 nir_cursors_equal(nir_cursor a, nir_cursor b)
 766 {
 767    /* Reduced cursors should be unique */
 768    a = reduce_cursor(a);
 769    b = reduce_cursor(b);
 770
 771    return a.block == b.block && a.option == b.option;
 772 }
 773
 774 static bool
 775 add_use_cb(nir_src *src, void *state)
 776 {
 777    nir_instr *instr = state;
 778
 779    src->parent_instr = instr;
 780    list_addtail(&src->use_link,
 781                 src->is_ssa ? &src->ssa->uses : &src->reg.reg->uses);
 782
 783    return true;
 784 }
 785
 786 static bool
 787 add_ssa_def_cb(nir_ssa_def *def, void *state)
 788 {
 789    nir_instr *instr = state;
 790
 791    if (instr->block && def->index == UINT_MAX) {
 792       nir_function_impl *impl =
 793          nir_cf_node_get_function(&instr->block->cf_node);
 794
 795       def->index = impl->ssa_alloc++;
 796    }
 797
 798    return true;
 799 }
 800
 801 static bool
 802 add_reg_def_cb(nir_dest *dest, void *state)
 803 {
 804    nir_instr *instr = state;
 805
 806    if (!dest->is_ssa) {
 807       dest->reg.parent_instr = instr;
 808       list_addtail(&dest->reg.def_link, &dest->reg.reg->defs);
 809    }
 810
 811    return true;
 812 }
 813
 814 static void
 815 add_defs_uses(nir_instr *instr)
 816 {
 817    nir_foreach_src(instr, add_use_cb, instr);
 818    nir_foreach_dest(instr, add_reg_def_cb, instr);
 819    nir_foreach_ssa_def(instr, add_ssa_def_cb, instr);
 820 }
 821
 822 void
 823 nir_instr_insert(nir_cursor cursor, nir_instr *instr)
 824 {
 825    switch (cursor.option) {
 826    case nir_cursor_before_block:
 827       /* Only allow inserting jumps into empty blocks. */
 828       if (instr->type == nir_instr_type_jump)
 829          assert(exec_list_is_empty(&cursor.block->instr_list));
 830
 831       instr->block = cursor.block;
 832       add_defs_uses(instr);
 833       exec_list_push_head(&cursor.block->instr_list, &instr->node);
 834       break;
 835    case nir_cursor_after_block: {
 836       /* Inserting instructions after a jump is illegal. */
 837       nir_instr *last = nir_block_last_instr(cursor.block);
 838       assert(last == NULL || last->type != nir_instr_type_jump);
 839       (void) last;
 840
 841       instr->block = cursor.block;
 842       add_defs_uses(instr);
 843       exec_list_push_tail(&cursor.block->instr_list, &instr->node);
 844       break;
 845    }
 846    case nir_cursor_before_instr:
 847       assert(instr->type != nir_instr_type_jump);
 848       instr->block = cursor.instr->block;
 849       add_defs_uses(instr);
 850       exec_node_insert_node_before(&cursor.instr->node, &instr->node);
 851       break;
 852    case nir_cursor_after_instr:
 853       /* Inserting instructions after a jump is illegal. */
 854       assert(cursor.instr->type != nir_instr_type_jump);
 855
 856       /* Only allow inserting jumps at the end of the block. */
 857       if (instr->type == nir_instr_type_jump)
 858          assert(cursor.instr == nir_block_last_instr(cursor.instr->block));
 859
 860       instr->block = cursor.instr->block;
 861       add_defs_uses(instr);
 862       exec_node_insert_after(&cursor.instr->node, &instr->node);
 863       break;
 864    }
 865
 866    if (instr->type == nir_instr_type_jump)
 867       nir_handle_add_jump(instr->block);
 868 }
 869
 870 static bool
 871 src_is_valid(const nir_src *src)
 872 {
 873    return src->is_ssa ? (src->ssa != NULL) : (src->reg.reg != NULL);
 874 }
 875
 876 static bool
 877 remove_use_cb(nir_src *src, void *state)
 878 {
 879    (void) state;
 880
 881    if (src_is_valid(src))
 882       list_del(&src->use_link);
 883
 884    return true;
 885 }
 886
 887 static bool
 888 remove_def_cb(nir_dest *dest, void *state)
 889 {
 890    (void) state;
 891
 892    if (!dest->is_ssa)
 893       list_del(&dest->reg.def_link);
 894
 895    return true;
 896 }
 897
 898 static void
 899 remove_defs_uses(nir_instr *instr)
 900 {
 901    nir_foreach_dest(instr, remove_def_cb, instr);
 902    nir_foreach_src(instr, remove_use_cb, instr);
 903 }
 904
 905 void nir_instr_remove_v(nir_instr *instr)
 906 {
 907    remove_defs_uses(instr);
 908    exec_node_remove(&instr->node);
 909
 910    if (instr->type == nir_instr_type_jump) {
 911       nir_jump_instr *jump_instr = nir_instr_as_jump(instr);
 912       nir_handle_remove_jump(instr->block, jump_instr->type);
 913    }
 914 }
 915
 916 /*@}*/
 917
 918 void
 919 nir_index_local_regs(nir_function_impl *impl)
 920 {
 921    unsigned index = 0;
 922    foreach_list_typed(nir_register, reg, node, &impl->registers) {
 923       reg->index = index++;
 924    }
 925    impl->reg_alloc = index;
 926 }
 927
 928 static bool
 929 visit_alu_dest(nir_alu_instr *instr, nir_foreach_dest_cb cb, void *state)
 930 {
 931    return cb(&instr->dest.dest, state);
 932 }
 933
 934 static bool
 935 visit_deref_dest(nir_deref_instr *instr, nir_foreach_dest_cb cb, void *state)
 936 {
 937    return cb(&instr->dest, state);
 938 }
 939
 940 static bool
 941 visit_intrinsic_dest(nir_intrinsic_instr *instr, nir_foreach_dest_cb cb,
 942                      void *state)
 943 {
 944    if (nir_intrinsic_infos[instr->intrinsic].has_dest)
 945       return cb(&instr->dest, state);
 946
 947    return true;
 948 }
 949
 950 static bool
 951 visit_texture_dest(nir_tex_instr *instr, nir_foreach_dest_cb cb,
 952                    void *state)
 953 {
 954    return cb(&instr->dest, state);
 955 }
 956
 957 static bool
 958 visit_phi_dest(nir_phi_instr *instr, nir_foreach_dest_cb cb, void *state)
 959 {
 960    return cb(&instr->dest, state);
 961 }
 962
 963 static bool
 964 visit_parallel_copy_dest(nir_parallel_copy_instr *instr,
 965                          nir_foreach_dest_cb cb, void *state)
 966 {
 967    nir_foreach_parallel_copy_entry(entry, instr) {
 968       if (!cb(&entry->dest, state))
 969          return false;
 970    }
 971
 972    return true;
 973 }
 974
 975 bool
 976 nir_foreach_dest(nir_instr *instr, nir_foreach_dest_cb cb, void *state)
 977 {
 978    switch (instr->type) {
 979    case nir_instr_type_alu:
 980       return visit_alu_dest(nir_instr_as_alu(instr), cb, state);
 981    case nir_instr_type_deref:
 982       return visit_deref_dest(nir_instr_as_deref(instr), cb, state);
 983    case nir_instr_type_intrinsic:
 984       return visit_intrinsic_dest(nir_instr_as_intrinsic(instr), cb, state);
 985    case nir_instr_type_tex:
 986       return visit_texture_dest(nir_instr_as_tex(instr), cb, state);
 987    case nir_instr_type_phi:
 988       return visit_phi_dest(nir_instr_as_phi(instr), cb, state);
 989    case nir_instr_type_parallel_copy:
 990       return visit_parallel_copy_dest(nir_instr_as_parallel_copy(instr),
 991                                       cb, state);
 992
 993    case nir_instr_type_load_const:
 994    case nir_instr_type_ssa_undef:
 995    case nir_instr_type_call:
 996    case nir_instr_type_jump:
 997       break;
 998
 999    default:
1000       unreachable("Invalid instruction type");
1001       break;
1002    }
1003
1004    return true;
1005 }
1006
1007 struct foreach_ssa_def_state {
1008    nir_foreach_ssa_def_cb cb;
1009    void *client_state;
1010 };
1011
1012 static inline bool
1013 nir_ssa_def_visitor(nir_dest *dest, void *void_state)
1014 {
1015    struct foreach_ssa_def_state *state = void_state;
1016
1017    if (dest->is_ssa)
1018       return state->cb(&dest->ssa, state->client_state);
1019    else
1020       return true;
1021 }
1022
1023 bool
1024 nir_foreach_ssa_def(nir_instr *instr, nir_foreach_ssa_def_cb cb, void *state)
1025 {
1026    switch (instr->type) {
1027    case nir_instr_type_alu:
1028    case nir_instr_type_deref:
1029    case nir_instr_type_tex:
1030    case nir_instr_type_intrinsic:
1031    case nir_instr_type_phi:
1032    case nir_instr_type_parallel_copy: {
1033       struct foreach_ssa_def_state foreach_state = {cb, state};
1034       return nir_foreach_dest(instr, nir_ssa_def_visitor, &foreach_state);
1035    }
1036
1037    case nir_instr_type_load_const:
1038       return cb(&nir_instr_as_load_const(instr)->def, state);
1039    case nir_instr_type_ssa_undef:
1040       return cb(&nir_instr_as_ssa_undef(instr)->def, state);
1041    case nir_instr_type_call:
1042    case nir_instr_type_jump:
1043       return true;
1044    default:
1045       unreachable("Invalid instruction type");
1046    }
1047 }
1048
1049 nir_ssa_def *
1050 nir_instr_ssa_def(nir_instr *instr)
1051 {
1052    switch (instr->type) {
1053    case nir_instr_type_alu:
1054       assert(nir_instr_as_alu(instr)->dest.dest.is_ssa);
1055       return &nir_instr_as_alu(instr)->dest.dest.ssa;
1056
1057    case nir_instr_type_deref:
1058       assert(nir_instr_as_deref(instr)->dest.is_ssa);
1059       return &nir_instr_as_deref(instr)->dest.ssa;
1060
1061    case nir_instr_type_tex:
1062       assert(nir_instr_as_tex(instr)->dest.is_ssa);
1063       return &nir_instr_as_tex(instr)->dest.ssa;
1064
1065    case nir_instr_type_intrinsic: {
1066       nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
1067       if (nir_intrinsic_infos[intrin->intrinsic].has_dest) {
1068          assert(intrin->dest.is_ssa);
1069          return &intrin->dest.ssa;
1070       } else {
1071          return NULL;
1072       }
1073    }
1074
1075    case nir_instr_type_phi:
1076       assert(nir_instr_as_phi(instr)->dest.is_ssa);
1077       return &nir_instr_as_phi(instr)->dest.ssa;
1078
1079    case nir_instr_type_parallel_copy:
1080       unreachable("Parallel copies are unsupported by this function");
1081
1082    case nir_instr_type_load_const:
1083       return &nir_instr_as_load_const(instr)->def;
1084
1085    case nir_instr_type_ssa_undef:
1086       return &nir_instr_as_ssa_undef(instr)->def;
1087
1088    case nir_instr_type_call:
1089    case nir_instr_type_jump:
1090       return NULL;
1091    }
1092
1093    unreachable("Invalid instruction type");
1094 }
1095
1096 static bool
1097 visit_src(nir_src *src, nir_foreach_src_cb cb, void *state)
1098 {
1099    if (!cb(src, state))
1100       return false;
1101    if (!src->is_ssa && src->reg.indirect)
1102       return cb(src->reg.indirect, state);
1103    return true;
1104 }
1105
1106 static bool
1107 visit_alu_src(nir_alu_instr *instr, nir_foreach_src_cb cb, void *state)
1108 {
1109    for (unsigned i = 0; i < nir_op_infos[instr->op].num_inputs; i++)
1110       if (!visit_src(&instr->src[i].src, cb, state))
1111          return false;
1112
1113    return true;
1114 }
1115
1116 static bool
1117 visit_deref_instr_src(nir_deref_instr *instr,
1118                       nir_foreach_src_cb cb, void *state)
1119 {
1120    if (instr->deref_type != nir_deref_type_var) {
1121       if (!visit_src(&instr->parent, cb, state))
1122          return false;
1123    }
1124
1125    if (instr->deref_type == nir_deref_type_array ||
1126        instr->deref_type == nir_deref_type_ptr_as_array) {
1127       if (!visit_src(&instr->arr.index, cb, state))
1128          return false;
1129    }
1130
1131    return true;
1132 }
1133
1134 static bool
1135 visit_tex_src(nir_tex_instr *instr, nir_foreach_src_cb cb, void *state)
1136 {
1137    for (unsigned i = 0; i < instr->num_srcs; i++) {
1138       if (!visit_src(&instr->src[i].src, cb, state))
1139          return false;
1140    }
1141
1142    return true;
1143 }
1144
1145 static bool
1146 visit_intrinsic_src(nir_intrinsic_instr *instr, nir_foreach_src_cb cb,
1147                     void *state)
1148 {
1149    unsigned num_srcs = nir_intrinsic_infos[instr->intrinsic].num_srcs;
1150    for (unsigned i = 0; i < num_srcs; i++) {
1151       if (!visit_src(&instr->src[i], cb, state))
1152          return false;
1153    }
1154
1155    return true;
1156 }
1157
1158 static bool
1159 visit_call_src(nir_call_instr *instr, nir_foreach_src_cb cb, void *state)
1160 {
1161    for (unsigned i = 0; i < instr->num_params; i++) {
1162       if (!visit_src(&instr->params[i], cb, state))
1163          return false;
1164    }
1165
1166    return true;
1167 }
1168
1169 static bool
1170 visit_phi_src(nir_phi_instr *instr, nir_foreach_src_cb cb, void *state)
1171 {
1172    nir_foreach_phi_src(src, instr) {
1173       if (!visit_src(&src->src, cb, state))
1174          return false;
1175    }
1176
1177    return true;
1178 }
1179
1180 static bool
1181 visit_parallel_copy_src(nir_parallel_copy_instr *instr,
1182                         nir_foreach_src_cb cb, void *state)
1183 {
1184    nir_foreach_parallel_copy_entry(entry, instr) {
1185       if (!visit_src(&entry->src, cb, state))
1186          return false;
1187    }
1188
1189    return true;
1190 }
1191
1192 typedef struct {
1193    void *state;
1194    nir_foreach_src_cb cb;
1195 } visit_dest_indirect_state;
1196
1197 static bool
1198 visit_dest_indirect(nir_dest *dest, void *_state)
1199 {
1200    visit_dest_indirect_state *state = (visit_dest_indirect_state *) _state;
1201
1202    if (!dest->is_ssa && dest->reg.indirect)
1203       return state->cb(dest->reg.indirect, state->state);
1204
1205    return true;
1206 }
1207
1208 bool
1209 nir_foreach_src(nir_instr *instr, nir_foreach_src_cb cb, void *state)
1210 {
1211    switch (instr->type) {
1212    case nir_instr_type_alu:
1213       if (!visit_alu_src(nir_instr_as_alu(instr), cb, state))
1214          return false;
1215       break;
1216    case nir_instr_type_deref:
1217       if (!visit_deref_instr_src(nir_instr_as_deref(instr), cb, state))
1218          return false;
1219       break;
1220    case nir_instr_type_intrinsic:
1221       if (!visit_intrinsic_src(nir_instr_as_intrinsic(instr), cb, state))
1222          return false;
1223       break;
1224    case nir_instr_type_tex:
1225       if (!visit_tex_src(nir_instr_as_tex(instr), cb, state))
1226          return false;
1227       break;
1228    case nir_instr_type_call:
1229       if (!visit_call_src(nir_instr_as_call(instr), cb, state))
1230          return false;
1231       break;
1232    case nir_instr_type_load_const:
1233       /* Constant load instructions have no regular sources */
1234       break;
1235    case nir_instr_type_phi:
1236       if (!visit_phi_src(nir_instr_as_phi(instr), cb, state))
1237          return false;
1238       break;
1239    case nir_instr_type_parallel_copy:
1240       if (!visit_parallel_copy_src(nir_instr_as_parallel_copy(instr),
1241                                    cb, state))
1242          return false;
1243       break;
1244    case nir_instr_type_jump:
1245    case nir_instr_type_ssa_undef:
1246       return true;
1247
1248    default:
1249       unreachable("Invalid instruction type");
1250       break;
1251    }
1252
1253    visit_dest_indirect_state dest_state;
1254    dest_state.state = state;
1255    dest_state.cb = cb;
1256    return nir_foreach_dest(instr, visit_dest_indirect, &dest_state);
1257 }
1258
1259 bool
1260 nir_foreach_phi_src_leaving_block(nir_block *block,
1261                                   nir_foreach_src_cb cb,
1262                                   void *state)
1263 {
1264    for (unsigned i = 0; i < ARRAY_SIZE(block->successors); i++) {
1265       if (block->successors[i] == NULL)
1266          continue;
1267
1268       nir_foreach_instr(instr, block->successors[i]) {
1269          if (instr->type != nir_instr_type_phi)
1270             break;
1271
1272          nir_phi_instr *phi = nir_instr_as_phi(instr);
1273          nir_foreach_phi_src(phi_src, phi) {
1274             if (phi_src->pred == block) {
1275                if (!cb(&phi_src->src, state))
1276                   return false;
1277             }
1278          }
1279       }
1280    }
1281
1282    return true;
1283 }
1284
1285 nir_const_value
1286 nir_const_value_for_float(double f, unsigned bit_size)
1287 {
1288    nir_const_value v;
1289    memset(&v, 0, sizeof(v));
1290
1291    switch (bit_size) {
1292    case 16:
1293       v.u16 = _mesa_float_to_half(f);
1294       break;
1295    case 32:
1296       v.f32 = f;
1297       break;
1298    case 64:
1299       v.f64 = f;
1300       break;
1301    default:
1302       unreachable("Invalid bit size");
1303    }
1304
1305    return v;
1306 }
1307
1308 double
1309 nir_const_value_as_float(nir_const_value value, unsigned bit_size)
1310 {
1311    switch (bit_size) {
1312    case 16: return _mesa_half_to_float(value.u16);
1313    case 32: return value.f32;
1314    case 64: return value.f64;
1315    default:
1316       unreachable("Invalid bit size");
1317    }
1318 }
1319
1320 nir_const_value *
1321 nir_src_as_const_value(nir_src src)
1322 {
1323    if (!src.is_ssa)
1324       return NULL;
1325
1326    if (src.ssa->parent_instr->type != nir_instr_type_load_const)
1327       return NULL;
1328
1329    nir_load_const_instr *load = nir_instr_as_load_const(src.ssa->parent_instr);
1330
1331    return load->value;
1332 }
1333
1334 /**
1335  * Returns true if the source is known to be dynamically uniform. Otherwise it
1336  * returns false which means it may or may not be dynamically uniform but it
1337  * can't be determined.
1338  */
1339 bool
1340 nir_src_is_dynamically_uniform(nir_src src)
1341 {
1342    if (!src.is_ssa)
1343       return false;
1344
1345    /* Constants are trivially dynamically uniform */
1346    if (src.ssa->parent_instr->type == nir_instr_type_load_const)
1347       return true;
1348
1349    /* As are uniform variables */
1350    if (src.ssa->parent_instr->type == nir_instr_type_intrinsic) {
1351       nir_intrinsic_instr *intr = nir_instr_as_intrinsic(src.ssa->parent_instr);
1352
1353       if (intr->intrinsic == nir_intrinsic_load_uniform)
1354          return true;
1355    }
1356
1357    /* Operating together dynamically uniform expressions produces a
1358     * dynamically uniform result
1359     */
1360    if (src.ssa->parent_instr->type == nir_instr_type_alu) {
1361       nir_alu_instr *alu = nir_instr_as_alu(src.ssa->parent_instr);
1362       for (int i = 0; i < nir_op_infos[alu->op].num_inputs; i++) {
1363          if (!nir_src_is_dynamically_uniform(alu->src[i].src))
1364             return false;
1365       }
1366
1367       return true;
1368    }
1369
1370    /* XXX: this could have many more tests, such as when a sampler function is
1371     * called with dynamically uniform arguments.
1372     */
1373    return false;
1374 }
1375
1376 static void
1377 src_remove_all_uses(nir_src *src)
1378 {
1379    for (; src; src = src->is_ssa ? NULL : src->reg.indirect) {
1380       if (!src_is_valid(src))
1381          continue;
1382
1383       list_del(&src->use_link);
1384    }
1385 }
1386
1387 static void
1388 src_add_all_uses(nir_src *src, nir_instr *parent_instr, nir_if *parent_if)
1389 {
1390    for (; src; src = src->is_ssa ? NULL : src->reg.indirect) {
1391       if (!src_is_valid(src))
1392          continue;
1393
1394       if (parent_instr) {
1395          src->parent_instr = parent_instr;
1396          if (src->is_ssa)
1397             list_addtail(&src->use_link, &src->ssa->uses);
1398          else
1399             list_addtail(&src->use_link, &src->reg.reg->uses);
1400       } else {
1401          assert(parent_if);
1402          src->parent_if = parent_if;
1403          if (src->is_ssa)
1404             list_addtail(&src->use_link, &src->ssa->if_uses);
1405          else
1406             list_addtail(&src->use_link, &src->reg.reg->if_uses);
1407       }
1408    }
1409 }
1410
1411 void
1412 nir_instr_rewrite_src(nir_instr *instr, nir_src *src, nir_src new_src)
1413 {
1414    assert(!src_is_valid(src) || src->parent_instr == instr);
1415
1416    src_remove_all_uses(src);
1417    *src = new_src;
1418    src_add_all_uses(src, instr, NULL);
1419 }
1420
1421 void
1422 nir_instr_move_src(nir_instr *dest_instr, nir_src *dest, nir_src *src)
1423 {
1424    assert(!src_is_valid(dest) || dest->parent_instr == dest_instr);
1425
1426    src_remove_all_uses(dest);
1427    src_remove_all_uses(src);
1428    *dest = *src;
1429    *src = NIR_SRC_INIT;
1430    src_add_all_uses(dest, dest_instr, NULL);
1431 }
1432
1433 void
1434 nir_if_rewrite_condition(nir_if *if_stmt, nir_src new_src)
1435 {
1436    nir_src *src = &if_stmt->condition;
1437    assert(!src_is_valid(src) || src->parent_if == if_stmt);
1438
1439    src_remove_all_uses(src);
1440    *src = new_src;
1441    src_add_all_uses(src, NULL, if_stmt);
1442 }
1443
1444 void
1445 nir_instr_rewrite_dest(nir_instr *instr, nir_dest *dest, nir_dest new_dest)
1446 {
1447    if (dest->is_ssa) {
1448       /* We can only overwrite an SSA destination if it has no uses. */
1449       assert(list_is_empty(&dest->ssa.uses) && list_is_empty(&dest->ssa.if_uses));
1450    } else {
1451       list_del(&dest->reg.def_link);
1452       if (dest->reg.indirect)
1453          src_remove_all_uses(dest->reg.indirect);
1454    }
1455
1456    /* We can't re-write with an SSA def */
1457    assert(!new_dest.is_ssa);
1458
1459    nir_dest_copy(dest, &new_dest, instr);
1460
1461    dest->reg.parent_instr = instr;
1462    list_addtail(&dest->reg.def_link, &new_dest.reg.reg->defs);
1463
1464    if (dest->reg.indirect)
1465       src_add_all_uses(dest->reg.indirect, instr, NULL);
1466 }
1467
1468 /* note: does *not* take ownership of 'name' */
1469 void
1470 nir_ssa_def_init(nir_instr *instr, nir_ssa_def *def,
1471                  unsigned num_components,
1472                  unsigned bit_size, const char *name)
1473 {
1474    def->name = ralloc_strdup(instr, name);
1475    def->parent_instr = instr;
1476    list_inithead(&def->uses);
1477    list_inithead(&def->if_uses);
1478    def->num_components = num_components;
1479    def->bit_size = bit_size;
1480    def->divergent = true; /* This is the safer default */
1481
1482    if (instr->block) {
1483       nir_function_impl *impl =
1484          nir_cf_node_get_function(&instr->block->cf_node);
1485
1486       def->index = impl->ssa_alloc++;
1487    } else {
1488       def->index = UINT_MAX;
1489    }
1490 }
1491
1492 /* note: does *not* take ownership of 'name' */
1493 void
1494 nir_ssa_dest_init(nir_instr *instr, nir_dest *dest,
1495                  unsigned num_components, unsigned bit_size,
1496                  const char *name)
1497 {
1498    dest->is_ssa = true;
1499    nir_ssa_def_init(instr, &dest->ssa, num_components, bit_size, name);
1500 }
1501
1502 void
1503 nir_ssa_def_rewrite_uses(nir_ssa_def *def, nir_src new_src)
1504 {
1505    assert(!new_src.is_ssa || def != new_src.ssa);
1506
1507    nir_foreach_use_safe(use_src, def)
1508       nir_instr_rewrite_src(use_src->parent_instr, use_src, new_src);
1509
1510    nir_foreach_if_use_safe(use_src, def)
1511       nir_if_rewrite_condition(use_src->parent_if, new_src);
1512 }
1513
1514 static bool
1515 is_instr_between(nir_instr *start, nir_instr *end, nir_instr *between)
1516 {
1517    assert(start->block == end->block);
1518
1519    if (between->block != start->block)
1520       return false;
1521
1522    /* Search backwards looking for "between" */
1523    while (start != end) {
1524       if (between == end)
1525          return true;
1526
1527       end = nir_instr_prev(end);
1528       assert(end);
1529    }
1530
1531    return false;
1532 }
1533
1534 /* Replaces all uses of the given SSA def with the given source but only if
1535  * the use comes after the after_me instruction.  This can be useful if you
1536  * are emitting code to fix up the result of some instruction: you can freely
1537  * use the result in that code and then call rewrite_uses_after and pass the
1538  * last fixup instruction as after_me and it will replace all of the uses you
1539  * want without touching the fixup code.
1540  *
1541  * This function assumes that after_me is in the same block as
1542  * def->parent_instr and that after_me comes after def->parent_instr.
1543  */
1544 void
1545 nir_ssa_def_rewrite_uses_after(nir_ssa_def *def, nir_src new_src,
1546                                nir_instr *after_me)
1547 {
1548    if (new_src.is_ssa && def == new_src.ssa)
1549       return;
1550
1551    nir_foreach_use_safe(use_src, def) {
1552       assert(use_src->parent_instr != def->parent_instr);
1553       /* Since def already dominates all of its uses, the only way a use can
1554        * not be dominated by after_me is if it is between def and after_me in
1555        * the instruction list.
1556        */
1557       if (!is_instr_between(def->parent_instr, after_me, use_src->parent_instr))
1558          nir_instr_rewrite_src(use_src->parent_instr, use_src, new_src);
1559    }
1560
1561    nir_foreach_if_use_safe(use_src, def)
1562       nir_if_rewrite_condition(use_src->parent_if, new_src);
1563 }
1564
1565 nir_component_mask_t
1566 nir_ssa_def_components_read(const nir_ssa_def *def)
1567 {
1568    nir_component_mask_t read_mask = 0;
1569    nir_foreach_use(use, def) {
1570       if (use->parent_instr->type == nir_instr_type_alu) {
1571          nir_alu_instr *alu = nir_instr_as_alu(use->parent_instr);
1572          nir_alu_src *alu_src = exec_node_data(nir_alu_src, use, src);
1573          int src_idx = alu_src - &alu->src[0];
1574          assert(src_idx >= 0 && src_idx < nir_op_infos[alu->op].num_inputs);
1575          read_mask |= nir_alu_instr_src_read_mask(alu, src_idx);
1576       } else {
1577          return (1 << def->num_components) - 1;
1578       }
1579    }
1580
1581    if (!list_is_empty(&def->if_uses))
1582       read_mask |= 1;
1583
1584    return read_mask;
1585 }
1586
1587 nir_block *
1588 nir_block_cf_tree_next(nir_block *block)
1589 {
1590    if (block == NULL) {
1591       /* nir_foreach_block_safe() will call this function on a NULL block
1592        * after the last iteration, but it won't use the result so just return
1593        * NULL here.
1594        */
1595       return NULL;
1596    }
1597
1598    nir_cf_node *cf_next = nir_cf_node_next(&block->cf_node);
1599    if (cf_next)
1600       return nir_cf_node_cf_tree_first(cf_next);
1601
1602    nir_cf_node *parent = block->cf_node.parent;
1603
1604    switch (parent->type) {
1605    case nir_cf_node_if: {
1606       /* Are we at the end of the if? Go to the beginning of the else */
1607       nir_if *if_stmt = nir_cf_node_as_if(parent);
1608       if (block == nir_if_last_then_block(if_stmt))
1609          return nir_if_first_else_block(if_stmt);
1610
1611       assert(block == nir_if_last_else_block(if_stmt));
1612       /* fall through */
1613    }
1614
1615    case nir_cf_node_loop:
1616       return nir_cf_node_as_block(nir_cf_node_next(parent));
1617
1618    case nir_cf_node_function:
1619       return NULL;
1620
1621    default:
1622       unreachable("unknown cf node type");
1623    }
1624 }
1625
1626 nir_block *
1627 nir_block_cf_tree_prev(nir_block *block)
1628 {
1629    if (block == NULL) {
1630       /* do this for consistency with nir_block_cf_tree_next() */
1631       return NULL;
1632    }
1633
1634    nir_cf_node *cf_prev = nir_cf_node_prev(&block->cf_node);
1635    if (cf_prev)
1636       return nir_cf_node_cf_tree_last(cf_prev);
1637
1638    nir_cf_node *parent = block->cf_node.parent;
1639
1640    switch (parent->type) {
1641    case nir_cf_node_if: {
1642       /* Are we at the beginning of the else? Go to the end of the if */
1643       nir_if *if_stmt = nir_cf_node_as_if(parent);
1644       if (block == nir_if_first_else_block(if_stmt))
1645          return nir_if_last_then_block(if_stmt);
1646
1647       assert(block == nir_if_first_then_block(if_stmt));
1648       /* fall through */
1649    }
1650
1651    case nir_cf_node_loop:
1652       return nir_cf_node_as_block(nir_cf_node_prev(parent));
1653
1654    case nir_cf_node_function:
1655       return NULL;
1656
1657    default:
1658       unreachable("unknown cf node type");
1659    }
1660 }
1661
1662 nir_block *nir_cf_node_cf_tree_first(nir_cf_node *node)
1663 {
1664    switch (node->type) {
1665    case nir_cf_node_function: {
1666       nir_function_impl *impl = nir_cf_node_as_function(node);
1667       return nir_start_block(impl);
1668    }
1669
1670    case nir_cf_node_if: {
1671       nir_if *if_stmt = nir_cf_node_as_if(node);
1672       return nir_if_first_then_block(if_stmt);
1673    }
1674
1675    case nir_cf_node_loop: {
1676       nir_loop *loop = nir_cf_node_as_loop(node);
1677       return nir_loop_first_block(loop);
1678    }
1679
1680    case nir_cf_node_block: {
1681       return nir_cf_node_as_block(node);
1682    }
1683
1684    default:
1685       unreachable("unknown node type");
1686    }
1687 }
1688
1689 nir_block *nir_cf_node_cf_tree_last(nir_cf_node *node)
1690 {
1691    switch (node->type) {
1692    case nir_cf_node_function: {
1693       nir_function_impl *impl = nir_cf_node_as_function(node);
1694       return nir_impl_last_block(impl);
1695    }
1696
1697    case nir_cf_node_if: {
1698       nir_if *if_stmt = nir_cf_node_as_if(node);
1699       return nir_if_last_else_block(if_stmt);
1700    }
1701
1702    case nir_cf_node_loop: {
1703       nir_loop *loop = nir_cf_node_as_loop(node);
1704       return nir_loop_last_block(loop);
1705    }
1706
1707    case nir_cf_node_block: {
1708       return nir_cf_node_as_block(node);
1709    }
1710
1711    default:
1712       unreachable("unknown node type");
1713    }
1714 }
1715
1716 nir_block *nir_cf_node_cf_tree_next(nir_cf_node *node)
1717 {
1718    if (node->type == nir_cf_node_block)
1719       return nir_block_cf_tree_next(nir_cf_node_as_block(node));
1720    else if (node->type == nir_cf_node_function)
1721       return NULL;
1722    else
1723       return nir_cf_node_as_block(nir_cf_node_next(node));
1724 }
1725
1726 nir_if *
1727 nir_block_get_following_if(nir_block *block)
1728 {
1729    if (exec_node_is_tail_sentinel(&block->cf_node.node))
1730       return NULL;
1731
1732    if (nir_cf_node_is_last(&block->cf_node))
1733       return NULL;
1734
1735    nir_cf_node *next_node = nir_cf_node_next(&block->cf_node);
1736
1737    if (next_node->type != nir_cf_node_if)
1738       return NULL;
1739
1740    return nir_cf_node_as_if(next_node);
1741 }
1742
1743 nir_loop *
1744 nir_block_get_following_loop(nir_block *block)
1745 {
1746    if (exec_node_is_tail_sentinel(&block->cf_node.node))
1747       return NULL;
1748
1749    if (nir_cf_node_is_last(&block->cf_node))
1750       return NULL;
1751
1752    nir_cf_node *next_node = nir_cf_node_next(&block->cf_node);
1753
1754    if (next_node->type != nir_cf_node_loop)
1755       return NULL;
1756
1757    return nir_cf_node_as_loop(next_node);
1758 }
1759
1760 void
1761 nir_index_blocks(nir_function_impl *impl)
1762 {
1763    unsigned index = 0;
1764
1765    if (impl->valid_metadata & nir_metadata_block_index)
1766       return;
1767
1768    nir_foreach_block(block, impl) {
1769       block->index = index++;
1770    }
1771
1772    /* The end_block isn't really part of the program, which is why its index
1773     * is >= num_blocks.
1774     */
1775    impl->num_blocks = impl->end_block->index = index;
1776 }
1777
1778 static bool
1779 index_ssa_def_cb(nir_ssa_def *def, void *state)
1780 {
1781    unsigned *index = (unsigned *) state;
1782    def->index = (*index)++;
1783
1784    return true;
1785 }
1786
1787 /**
1788  * The indices are applied top-to-bottom which has the very nice property
1789  * that, if A dominates B, then A->index <= B->index.
1790  */
1791 void
1792 nir_index_ssa_defs(nir_function_impl *impl)
1793 {
1794    unsigned index = 0;
1795
1796    nir_foreach_block(block, impl) {
1797       nir_foreach_instr(instr, block)
1798          nir_foreach_ssa_def(instr, index_ssa_def_cb, &index);
1799    }
1800
1801    impl->ssa_alloc = index;
1802 }
1803
1804 /**
1805  * The indices are applied top-to-bottom which has the very nice property
1806  * that, if A dominates B, then A->index <= B->index.
1807  */
1808 unsigned
1809 nir_index_instrs(nir_function_impl *impl)
1810 {
1811    unsigned index = 0;
1812
1813    nir_foreach_block(block, impl) {
1814       nir_foreach_instr(instr, block)
1815          instr->index = index++;
1816    }
1817
1818    return index;
1819 }
1820
1821 static void
1822 index_var_list(struct exec_list *list)
1823 {
1824    unsigned next_index = 0;
1825    nir_foreach_variable(var, list)
1826       var->index = next_index++;
1827 }
1828
1829 void
1830 nir_index_vars(nir_shader *shader, nir_function_impl *impl, nir_variable_mode modes)
1831 {
1832    if ((modes & nir_var_function_temp) && impl)
1833       index_var_list(&impl->locals);
1834
1835    if (modes & nir_var_shader_temp)
1836       index_var_list(&shader->globals);
1837
1838    if (modes & nir_var_shader_in)
1839       index_var_list(&shader->inputs);
1840
1841    if (modes & nir_var_shader_out)
1842       index_var_list(&shader->outputs);
1843
1844    if (modes & (nir_var_uniform | nir_var_mem_ubo | nir_var_mem_ssbo))
1845       index_var_list(&shader->uniforms);
1846
1847    if (modes & nir_var_mem_shared)
1848       index_var_list(&shader->shared);
1849
1850    if (modes & nir_var_system_value)
1851       index_var_list(&shader->system_values);
1852 }
1853
1854 static nir_instr *
1855 cursor_next_instr(nir_cursor cursor)
1856 {
1857    switch (cursor.option) {
1858    case nir_cursor_before_block:
1859       for (nir_block *block = cursor.block; block;
1860            block = nir_block_cf_tree_next(block)) {
1861          nir_instr *instr = nir_block_first_instr(block);
1862          if (instr)
1863             return instr;
1864       }
1865       return NULL;
1866
1867    case nir_cursor_after_block:
1868       cursor.block = nir_block_cf_tree_next(cursor.block);
1869       if (cursor.block == NULL)
1870          return NULL;
1871
1872       cursor.option = nir_cursor_before_block;
1873       return cursor_next_instr(cursor);
1874
1875    case nir_cursor_before_instr:
1876       return cursor.instr;
1877
1878    case nir_cursor_after_instr:
1879       if (nir_instr_next(cursor.instr))
1880          return nir_instr_next(cursor.instr);
1881
1882       cursor.option = nir_cursor_after_block;
1883       cursor.block = cursor.instr->block;
1884       return cursor_next_instr(cursor);
1885    }
1886
1887    unreachable("Inavlid cursor option");
1888 }
1889
1890 ASSERTED static bool
1891 dest_is_ssa(nir_dest *dest, void *_state)
1892 {
1893    (void) _state;
1894    return dest->is_ssa;
1895 }
1896
1897 bool
1898 nir_function_impl_lower_instructions(nir_function_impl *impl,
1899                                      nir_instr_filter_cb filter,
1900                                      nir_lower_instr_cb lower,
1901                                      void *cb_data)
1902 {
1903    nir_builder b;
1904    nir_builder_init(&b, impl);
1905
1906    nir_metadata preserved = nir_metadata_block_index |
1907                             nir_metadata_dominance;
1908
1909    bool progress = false;
1910    nir_cursor iter = nir_before_cf_list(&impl->body);
1911    nir_instr *instr;
1912    while ((instr = cursor_next_instr(iter)) != NULL) {
1913       if (filter && !filter(instr, cb_data)) {
1914          iter = nir_after_instr(instr);
1915          continue;
1916       }
1917
1918       assert(nir_foreach_dest(instr, dest_is_ssa, NULL));
1919       nir_ssa_def *old_def = nir_instr_ssa_def(instr);
1920       if (old_def == NULL) {
1921          iter = nir_after_instr(instr);
1922          continue;
1923       }
1924
1925       /* We're about to ask the callback to generate a replacement for instr.
1926        * Save off the uses from instr's SSA def so we know what uses to
1927        * rewrite later.  If we use nir_ssa_def_rewrite_uses, it fails in the
1928        * case where the generated replacement code uses the result of instr
1929        * itself.  If we use nir_ssa_def_rewrite_uses_after (which is the
1930        * normal solution to this problem), it doesn't work well if control-
1931        * flow is inserted as part of the replacement, doesn't handle cases
1932        * where the replacement is something consumed by instr, and suffers
1933        * from performance issues.  This is the only way to 100% guarantee
1934        * that we rewrite the correct set efficiently.
1935        */
1936       struct list_head old_uses, old_if_uses;
1937       list_replace(&old_def->uses, &old_uses);
1938       list_inithead(&old_def->uses);
1939       list_replace(&old_def->if_uses, &old_if_uses);
1940       list_inithead(&old_def->if_uses);
1941
1942       b.cursor = nir_after_instr(instr);
1943       nir_ssa_def *new_def = lower(&b, instr, cb_data);
1944       if (new_def && new_def != NIR_LOWER_INSTR_PROGRESS) {
1945          assert(old_def != NULL);
1946          if (new_def->parent_instr->block != instr->block)
1947             preserved = nir_metadata_none;
1948
1949          nir_src new_src = nir_src_for_ssa(new_def);
1950          list_for_each_entry_safe(nir_src, use_src, &old_uses, use_link)
1951             nir_instr_rewrite_src(use_src->parent_instr, use_src, new_src);
1952
1953          list_for_each_entry_safe(nir_src, use_src, &old_if_uses, use_link)
1954             nir_if_rewrite_condition(use_src->parent_if, new_src);
1955
1956          if (list_is_empty(&old_def->uses) && list_is_empty(&old_def->if_uses)) {
1957             iter = nir_instr_remove(instr);
1958          } else {
1959             iter = nir_after_instr(instr);
1960          }
1961          progress = true;
1962       } else {
1963          /* We didn't end up lowering after all.  Put the uses back */
1964          if (old_def) {
1965             list_replace(&old_uses, &old_def->uses);
1966             list_replace(&old_if_uses, &old_def->if_uses);
1967          }
1968          iter = nir_after_instr(instr);
1969
1970          if (new_def == NIR_LOWER_INSTR_PROGRESS)
1971             progress = true;
1972       }
1973    }
1974
1975    if (progress) {
1976       nir_metadata_preserve(impl, preserved);
1977    } else {
1978 #ifndef NDEBUG
1979       impl->valid_metadata &= ~nir_metadata_not_properly_reset;
1980 #endif
1981    }
1982
1983    return progress;
1984 }
1985
1986 bool
1987 nir_shader_lower_instructions(nir_shader *shader,
1988                               nir_instr_filter_cb filter,
1989                               nir_lower_instr_cb lower,
1990                               void *cb_data)
1991 {
1992    bool progress = false;
1993
1994    nir_foreach_function(function, shader) {
1995       if (function->impl &&
1996           nir_function_impl_lower_instructions(function->impl,
1997                                                filter, lower, cb_data))
1998          progress = true;
1999    }
2000
2001    return progress;
2002 }
2003
2004 nir_intrinsic_op
2005 nir_intrinsic_from_system_value(gl_system_value val)
2006 {
2007    switch (val) {
2008    case SYSTEM_VALUE_VERTEX_ID:
2009       return nir_intrinsic_load_vertex_id;
2010    case SYSTEM_VALUE_INSTANCE_ID:
2011       return nir_intrinsic_load_instance_id;
2012    case SYSTEM_VALUE_DRAW_ID:
2013       return nir_intrinsic_load_draw_id;
2014    case SYSTEM_VALUE_BASE_INSTANCE:
2015       return nir_intrinsic_load_base_instance;
2016    case SYSTEM_VALUE_VERTEX_ID_ZERO_BASE:
2017       return nir_intrinsic_load_vertex_id_zero_base;
2018    case SYSTEM_VALUE_IS_INDEXED_DRAW:
2019       return nir_intrinsic_load_is_indexed_draw;
2020    case SYSTEM_VALUE_FIRST_VERTEX:
2021       return nir_intrinsic_load_first_vertex;
2022    case SYSTEM_VALUE_BASE_VERTEX:
2023       return nir_intrinsic_load_base_vertex;
2024    case SYSTEM_VALUE_INVOCATION_ID:
2025       return nir_intrinsic_load_invocation_id;
2026    case SYSTEM_VALUE_FRAG_COORD:
2027       return nir_intrinsic_load_frag_coord;
2028    case SYSTEM_VALUE_POINT_COORD:
2029       return nir_intrinsic_load_point_coord;
2030    case SYSTEM_VALUE_FRONT_FACE:
2031       return nir_intrinsic_load_front_face;
2032    case SYSTEM_VALUE_SAMPLE_ID:
2033       return nir_intrinsic_load_sample_id;
2034    case SYSTEM_VALUE_SAMPLE_POS:
2035       return nir_intrinsic_load_sample_pos;
2036    case SYSTEM_VALUE_SAMPLE_MASK_IN:
2037       return nir_intrinsic_load_sample_mask_in;
2038    case SYSTEM_VALUE_LOCAL_INVOCATION_ID:
2039       return nir_intrinsic_load_local_invocation_id;
2040    case SYSTEM_VALUE_LOCAL_INVOCATION_INDEX:
2041       return nir_intrinsic_load_local_invocation_index;
2042    case SYSTEM_VALUE_WORK_GROUP_ID:
2043       return nir_intrinsic_load_work_group_id;
2044    case SYSTEM_VALUE_NUM_WORK_GROUPS:
2045       return nir_intrinsic_load_num_work_groups;
2046    case SYSTEM_VALUE_PRIMITIVE_ID:
2047       return nir_intrinsic_load_primitive_id;
2048    case SYSTEM_VALUE_TESS_COORD:
2049       return nir_intrinsic_load_tess_coord;
2050    case SYSTEM_VALUE_TESS_LEVEL_OUTER:
2051       return nir_intrinsic_load_tess_level_outer;
2052    case SYSTEM_VALUE_TESS_LEVEL_INNER:
2053       return nir_intrinsic_load_tess_level_inner;
2054    case SYSTEM_VALUE_TESS_LEVEL_OUTER_DEFAULT:
2055       return nir_intrinsic_load_tess_level_outer_default;
2056    case SYSTEM_VALUE_TESS_LEVEL_INNER_DEFAULT:
2057       return nir_intrinsic_load_tess_level_inner_default;
2058    case SYSTEM_VALUE_VERTICES_IN:
2059       return nir_intrinsic_load_patch_vertices_in;
2060    case SYSTEM_VALUE_HELPER_INVOCATION:
2061       return nir_intrinsic_load_helper_invocation;
2062    case SYSTEM_VALUE_COLOR0:
2063       return nir_intrinsic_load_color0;
2064    case SYSTEM_VALUE_COLOR1:
2065       return nir_intrinsic_load_color1;
2066    case SYSTEM_VALUE_VIEW_INDEX:
2067       return nir_intrinsic_load_view_index;
2068    case SYSTEM_VALUE_SUBGROUP_SIZE:
2069       return nir_intrinsic_load_subgroup_size;
2070    case SYSTEM_VALUE_SUBGROUP_INVOCATION:
2071       return nir_intrinsic_load_subgroup_invocation;
2072    case SYSTEM_VALUE_SUBGROUP_EQ_MASK:
2073       return nir_intrinsic_load_subgroup_eq_mask;
2074    case SYSTEM_VALUE_SUBGROUP_GE_MASK:
2075       return nir_intrinsic_load_subgroup_ge_mask;
2076    case SYSTEM_VALUE_SUBGROUP_GT_MASK:
2077       return nir_intrinsic_load_subgroup_gt_mask;
2078    case SYSTEM_VALUE_SUBGROUP_LE_MASK:
2079       return nir_intrinsic_load_subgroup_le_mask;
2080    case SYSTEM_VALUE_SUBGROUP_LT_MASK:
2081       return nir_intrinsic_load_subgroup_lt_mask;
2082    case SYSTEM_VALUE_NUM_SUBGROUPS:
2083       return nir_intrinsic_load_num_subgroups;
2084    case SYSTEM_VALUE_SUBGROUP_ID:
2085       return nir_intrinsic_load_subgroup_id;
2086    case SYSTEM_VALUE_LOCAL_GROUP_SIZE:
2087       return nir_intrinsic_load_local_group_size;
2088    case SYSTEM_VALUE_GLOBAL_INVOCATION_ID:
2089       return nir_intrinsic_load_global_invocation_id;
2090    case SYSTEM_VALUE_GLOBAL_INVOCATION_INDEX:
2091       return nir_intrinsic_load_global_invocation_index;
2092    case SYSTEM_VALUE_WORK_DIM:
2093       return nir_intrinsic_load_work_dim;
2094    case SYSTEM_VALUE_USER_DATA_AMD:
2095       return nir_intrinsic_load_user_data_amd;
2096    default:
2097       unreachable("system value does not directly correspond to intrinsic");
2098    }
2099 }
2100
2101 gl_system_value
2102 nir_system_value_from_intrinsic(nir_intrinsic_op intrin)
2103 {
2104    switch (intrin) {
2105    case nir_intrinsic_load_vertex_id:
2106       return SYSTEM_VALUE_VERTEX_ID;
2107    case nir_intrinsic_load_instance_id:
2108       return SYSTEM_VALUE_INSTANCE_ID;
2109    case nir_intrinsic_load_draw_id:
2110       return SYSTEM_VALUE_DRAW_ID;
2111    case nir_intrinsic_load_base_instance:
2112       return SYSTEM_VALUE_BASE_INSTANCE;
2113    case nir_intrinsic_load_vertex_id_zero_base:
2114       return SYSTEM_VALUE_VERTEX_ID_ZERO_BASE;
2115    case nir_intrinsic_load_first_vertex:
2116       return SYSTEM_VALUE_FIRST_VERTEX;
2117    case nir_intrinsic_load_is_indexed_draw:
2118       return SYSTEM_VALUE_IS_INDEXED_DRAW;
2119    case nir_intrinsic_load_base_vertex:
2120       return SYSTEM_VALUE_BASE_VERTEX;
2121    case nir_intrinsic_load_invocation_id:
2122       return SYSTEM_VALUE_INVOCATION_ID;
2123    case nir_intrinsic_load_frag_coord:
2124       return SYSTEM_VALUE_FRAG_COORD;
2125    case nir_intrinsic_load_point_coord:
2126       return SYSTEM_VALUE_POINT_COORD;
2127    case nir_intrinsic_load_front_face:
2128       return SYSTEM_VALUE_FRONT_FACE;
2129    case nir_intrinsic_load_sample_id:
2130       return SYSTEM_VALUE_SAMPLE_ID;
2131    case nir_intrinsic_load_sample_pos:
2132       return SYSTEM_VALUE_SAMPLE_POS;
2133    case nir_intrinsic_load_sample_mask_in:
2134       return SYSTEM_VALUE_SAMPLE_MASK_IN;
2135    case nir_intrinsic_load_local_invocation_id:
2136       return SYSTEM_VALUE_LOCAL_INVOCATION_ID;
2137    case nir_intrinsic_load_local_invocation_index:
2138       return SYSTEM_VALUE_LOCAL_INVOCATION_INDEX;
2139    case nir_intrinsic_load_num_work_groups:
2140       return SYSTEM_VALUE_NUM_WORK_GROUPS;
2141    case nir_intrinsic_load_work_group_id:
2142       return SYSTEM_VALUE_WORK_GROUP_ID;
2143    case nir_intrinsic_load_primitive_id:
2144       return SYSTEM_VALUE_PRIMITIVE_ID;
2145    case nir_intrinsic_load_tess_coord:
2146       return SYSTEM_VALUE_TESS_COORD;
2147    case nir_intrinsic_load_tess_level_outer:
2148       return SYSTEM_VALUE_TESS_LEVEL_OUTER;
2149    case nir_intrinsic_load_tess_level_inner:
2150       return SYSTEM_VALUE_TESS_LEVEL_INNER;
2151    case nir_intrinsic_load_tess_level_outer_default:
2152       return SYSTEM_VALUE_TESS_LEVEL_OUTER_DEFAULT;
2153    case nir_intrinsic_load_tess_level_inner_default:
2154       return SYSTEM_VALUE_TESS_LEVEL_INNER_DEFAULT;
2155    case nir_intrinsic_load_patch_vertices_in:
2156       return SYSTEM_VALUE_VERTICES_IN;
2157    case nir_intrinsic_load_helper_invocation:
2158       return SYSTEM_VALUE_HELPER_INVOCATION;
2159    case nir_intrinsic_load_color0:
2160       return SYSTEM_VALUE_COLOR0;
2161    case nir_intrinsic_load_color1:
2162       return SYSTEM_VALUE_COLOR1;
2163    case nir_intrinsic_load_view_index:
2164       return SYSTEM_VALUE_VIEW_INDEX;
2165    case nir_intrinsic_load_subgroup_size:
2166       return SYSTEM_VALUE_SUBGROUP_SIZE;
2167    case nir_intrinsic_load_subgroup_invocation:
2168       return SYSTEM_VALUE_SUBGROUP_INVOCATION;
2169    case nir_intrinsic_load_subgroup_eq_mask:
2170       return SYSTEM_VALUE_SUBGROUP_EQ_MASK;
2171    case nir_intrinsic_load_subgroup_ge_mask:
2172       return SYSTEM_VALUE_SUBGROUP_GE_MASK;
2173    case nir_intrinsic_load_subgroup_gt_mask:
2174       return SYSTEM_VALUE_SUBGROUP_GT_MASK;
2175    case nir_intrinsic_load_subgroup_le_mask:
2176       return SYSTEM_VALUE_SUBGROUP_LE_MASK;
2177    case nir_intrinsic_load_subgroup_lt_mask:
2178       return SYSTEM_VALUE_SUBGROUP_LT_MASK;
2179    case nir_intrinsic_load_num_subgroups:
2180       return SYSTEM_VALUE_NUM_SUBGROUPS;
2181    case nir_intrinsic_load_subgroup_id:
2182       return SYSTEM_VALUE_SUBGROUP_ID;
2183    case nir_intrinsic_load_local_group_size:
2184       return SYSTEM_VALUE_LOCAL_GROUP_SIZE;
2185    case nir_intrinsic_load_global_invocation_id:
2186       return SYSTEM_VALUE_GLOBAL_INVOCATION_ID;
2187    case nir_intrinsic_load_user_data_amd:
2188       return SYSTEM_VALUE_USER_DATA_AMD;
2189    default:
2190       unreachable("intrinsic doesn't produce a system value");
2191    }
2192 }
2193
2194 /* OpenGL utility method that remaps the location attributes if they are
2195  * doubles. Not needed for vulkan due the differences on the input location
2196  * count for doubles on vulkan vs OpenGL
2197  *
2198  * The bitfield returned in dual_slot is one bit for each double input slot in
2199  * the original OpenGL single-slot input numbering.  The mapping from old
2200  * locations to new locations is as follows:
2201  *
2202  *    new_loc = loc + util_bitcount(dual_slot & BITFIELD64_MASK(loc))
2203  */
2204 void
2205 nir_remap_dual_slot_attributes(nir_shader *shader, uint64_t *dual_slot)
2206 {
2207    assert(shader->info.stage == MESA_SHADER_VERTEX);
2208
2209    *dual_slot = 0;
2210    nir_foreach_variable(var, &shader->inputs) {
2211       if (glsl_type_is_dual_slot(glsl_without_array(var->type))) {
2212          unsigned slots = glsl_count_attribute_slots(var->type, true);
2213          *dual_slot |= BITFIELD64_MASK(slots) << var->data.location;
2214       }
2215    }
2216
2217    nir_foreach_variable(var, &shader->inputs) {
2218       var->data.location +=
2219          util_bitcount64(*dual_slot & BITFIELD64_MASK(var->data.location));
2220    }
2221 }
2222
2223 /* Returns an attribute mask that has been re-compacted using the given
2224  * dual_slot mask.
2225  */
2226 uint64_t
2227 nir_get_single_slot_attribs_mask(uint64_t attribs, uint64_t dual_slot)
2228 {
2229    while (dual_slot) {
2230       unsigned loc = u_bit_scan64(&dual_slot);
2231       /* mask of all bits up to and including loc */
2232       uint64_t mask = BITFIELD64_MASK(loc + 1);
2233       attribs = (attribs & mask) | ((attribs & ~mask) >> 1);
2234    }
2235    return attribs;
2236 }
2237
2238 void
2239 nir_rewrite_image_intrinsic(nir_intrinsic_instr *intrin, nir_ssa_def *src,
2240                             bool bindless)
2241 {
2242    enum gl_access_qualifier access = nir_intrinsic_access(intrin);
2243
2244    switch (intrin->intrinsic) {
2245 #define CASE(op) \
2246    case nir_intrinsic_image_deref_##op: \
2247       intrin->intrinsic = bindless ? nir_intrinsic_bindless_image_##op \
2248                                    : nir_intrinsic_image_##op; \
2249       break;
2250    CASE(load)
2251    CASE(store)
2252    CASE(atomic_add)
2253    CASE(atomic_imin)
2254    CASE(atomic_umin)
2255    CASE(atomic_imax)
2256    CASE(atomic_umax)
2257    CASE(atomic_and)
2258    CASE(atomic_or)
2259    CASE(atomic_xor)
2260    CASE(atomic_exchange)
2261    CASE(atomic_comp_swap)
2262    CASE(atomic_fadd)
2263    CASE(size)
2264    CASE(samples)
2265    CASE(load_raw_intel)
2266    CASE(store_raw_intel)
2267 #undef CASE
2268    default:
2269       unreachable("Unhanded image intrinsic");
2270    }
2271
2272    nir_deref_instr *deref = nir_src_as_deref(intrin->src[0]);
2273    nir_variable *var = nir_deref_instr_get_variable(deref);
2274
2275    nir_intrinsic_set_image_dim(intrin, glsl_get_sampler_dim(deref->type));
2276    nir_intrinsic_set_image_array(intrin, glsl_sampler_type_is_array(deref->type));
2277    nir_intrinsic_set_access(intrin, access | var->data.access);
2278    nir_intrinsic_set_format(intrin, var->data.image.format);
2279
2280    nir_instr_rewrite_src(&intrin->instr, &intrin->src[0],
2281                          nir_src_for_ssa(src));
2282 }
2283
2284 unsigned
2285 nir_image_intrinsic_coord_components(const nir_intrinsic_instr *instr)
2286 {
2287    enum glsl_sampler_dim dim = nir_intrinsic_image_dim(instr);
2288    int coords = glsl_get_sampler_dim_coordinate_components(dim);
2289    if (dim == GLSL_SAMPLER_DIM_CUBE)
2290       return coords;
2291    else
2292       return coords + nir_intrinsic_image_array(instr);
2293 }