src/compiler/nir/nir_builder.h

   1 /*
   2  * Copyright © 2014-2015 Broadcom
   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
  24 #ifndef NIR_BUILDER_H
  25 #define NIR_BUILDER_H
  26
  27 #include "nir_control_flow.h"
  28
  29 struct exec_list;
  30
  31 typedef struct nir_builder {
  32    nir_cursor cursor;
  33
  34    /* Whether new ALU instructions will be marked "exact" */
  35    bool exact;
  36
  37    nir_shader *shader;
  38    nir_function_impl *impl;
  39 } nir_builder;
  40
  41 static inline void
  42 nir_builder_init(nir_builder *build, nir_function_impl *impl)
  43 {
  44    memset(build, 0, sizeof(*build));
  45    build->exact = false;
  46    build->impl = impl;
  47    build->shader = impl->function->shader;
  48 }
  49
  50 static inline void
  51 nir_builder_init_simple_shader(nir_builder *build, void *mem_ctx,
  52                                gl_shader_stage stage,
  53                                const nir_shader_compiler_options *options)
  54 {
  55    build->shader = nir_shader_create(mem_ctx, stage, options, NULL);
  56    nir_function *func = nir_function_create(build->shader, "main");
  57    build->exact = false;
  58    build->impl = nir_function_impl_create(func);
  59    build->cursor = nir_after_cf_list(&build->impl->body);
  60 }
  61
  62 static inline void
  63 nir_builder_instr_insert(nir_builder *build, nir_instr *instr)
  64 {
  65    nir_instr_insert(build->cursor, instr);
  66
  67    /* Move the cursor forward. */
  68    build->cursor = nir_after_instr(instr);
  69 }
  70
  71 static inline nir_instr *
  72 nir_builder_last_instr(nir_builder *build)
  73 {
  74    assert(build->cursor.option == nir_cursor_after_instr);
  75    return build->cursor.instr;
  76 }
  77
  78 static inline void
  79 nir_builder_cf_insert(nir_builder *build, nir_cf_node *cf)
  80 {
  81    nir_cf_node_insert(build->cursor, cf);
  82 }
  83
  84 static inline bool
  85 nir_builder_is_inside_cf(nir_builder *build, nir_cf_node *cf_node)
  86 {
  87    nir_block *block = nir_cursor_current_block(build->cursor);
  88    for (nir_cf_node *n = &block->cf_node; n; n = n->parent) {
  89       if (n == cf_node)
  90          return true;
  91    }
  92    return false;
  93 }
  94
  95 static inline nir_if *
  96 nir_push_if(nir_builder *build, nir_ssa_def *condition)
  97 {
  98    nir_if *nif = nir_if_create(build->shader);
  99    nif->condition = nir_src_for_ssa(condition);
 100    nir_builder_cf_insert(build, &nif->cf_node);
 101    build->cursor = nir_before_cf_list(&nif->then_list);
 102    return nif;
 103 }
 104
 105 static inline nir_if *
 106 nir_push_else(nir_builder *build, nir_if *nif)
 107 {
 108    if (nif) {
 109       assert(nir_builder_is_inside_cf(build, &nif->cf_node));
 110    } else {
 111       nir_block *block = nir_cursor_current_block(build->cursor);
 112       nif = nir_cf_node_as_if(block->cf_node.parent);
 113    }
 114    build->cursor = nir_before_cf_list(&nif->else_list);
 115    return nif;
 116 }
 117
 118 static inline void
 119 nir_pop_if(nir_builder *build, nir_if *nif)
 120 {
 121    if (nif) {
 122       assert(nir_builder_is_inside_cf(build, &nif->cf_node));
 123    } else {
 124       nir_block *block = nir_cursor_current_block(build->cursor);
 125       nif = nir_cf_node_as_if(block->cf_node.parent);
 126    }
 127    build->cursor = nir_after_cf_node(&nif->cf_node);
 128 }
 129
 130 static inline nir_ssa_def *
 131 nir_if_phi(nir_builder *build, nir_ssa_def *then_def, nir_ssa_def *else_def)
 132 {
 133    nir_block *block = nir_cursor_current_block(build->cursor);
 134    nir_if *nif = nir_cf_node_as_if(nir_cf_node_prev(&block->cf_node));
 135
 136    nir_phi_instr *phi = nir_phi_instr_create(build->shader);
 137
 138    nir_phi_src *src = ralloc(phi, nir_phi_src);
 139    src->pred = nir_if_last_then_block(nif);
 140    src->src = nir_src_for_ssa(then_def);
 141    exec_list_push_tail(&phi->srcs, &src->node);
 142
 143    src = ralloc(phi, nir_phi_src);
 144    src->pred = nir_if_last_else_block(nif);
 145    src->src = nir_src_for_ssa(else_def);
 146    exec_list_push_tail(&phi->srcs, &src->node);
 147
 148    assert(then_def->num_components == else_def->num_components);
 149    assert(then_def->bit_size == else_def->bit_size);
 150    nir_ssa_dest_init(&phi->instr, &phi->dest,
 151                      then_def->num_components, then_def->bit_size, NULL);
 152
 153    nir_builder_instr_insert(build, &phi->instr);
 154
 155    return &phi->dest.ssa;
 156 }
 157
 158 static inline nir_loop *
 159 nir_push_loop(nir_builder *build)
 160 {
 161    nir_loop *loop = nir_loop_create(build->shader);
 162    nir_builder_cf_insert(build, &loop->cf_node);
 163    build->cursor = nir_before_cf_list(&loop->body);
 164    return loop;
 165 }
 166
 167 static inline void
 168 nir_pop_loop(nir_builder *build, nir_loop *loop)
 169 {
 170    if (loop) {
 171       assert(nir_builder_is_inside_cf(build, &loop->cf_node));
 172    } else {
 173       nir_block *block = nir_cursor_current_block(build->cursor);
 174       loop = nir_cf_node_as_loop(block->cf_node.parent);
 175    }
 176    build->cursor = nir_after_cf_node(&loop->cf_node);
 177 }
 178
 179 static inline nir_ssa_def *
 180 nir_ssa_undef(nir_builder *build, unsigned num_components, unsigned bit_size)
 181 {
 182    nir_ssa_undef_instr *undef =
 183       nir_ssa_undef_instr_create(build->shader, num_components, bit_size);
 184    if (!undef)
 185       return NULL;
 186
 187    nir_instr_insert(nir_before_cf_list(&build->impl->body), &undef->instr);
 188
 189    return &undef->def;
 190 }
 191
 192 static inline nir_ssa_def *
 193 nir_build_imm(nir_builder *build, unsigned num_components,
 194               unsigned bit_size, nir_const_value value)
 195 {
 196    nir_load_const_instr *load_const =
 197       nir_load_const_instr_create(build->shader, num_components, bit_size);
 198    if (!load_const)
 199       return NULL;
 200
 201    load_const->value = value;
 202
 203    nir_builder_instr_insert(build, &load_const->instr);
 204
 205    return &load_const->def;
 206 }
 207
 208 static inline nir_ssa_def *
 209 nir_imm_float(nir_builder *build, float x)
 210 {
 211    nir_const_value v;
 212
 213    memset(&v, 0, sizeof(v));
 214    v.f32[0] = x;
 215
 216    return nir_build_imm(build, 1, 32, v);
 217 }
 218
 219 static inline nir_ssa_def *
 220 nir_imm_double(nir_builder *build, double x)
 221 {
 222    nir_const_value v;
 223
 224    memset(&v, 0, sizeof(v));
 225    v.f64[0] = x;
 226
 227    return nir_build_imm(build, 1, 64, v);
 228 }
 229
 230 static inline nir_ssa_def *
 231 nir_imm_vec4(nir_builder *build, float x, float y, float z, float w)
 232 {
 233    nir_const_value v;
 234
 235    memset(&v, 0, sizeof(v));
 236    v.f32[0] = x;
 237    v.f32[1] = y;
 238    v.f32[2] = z;
 239    v.f32[3] = w;
 240
 241    return nir_build_imm(build, 4, 32, v);
 242 }
 243
 244 static inline nir_ssa_def *
 245 nir_imm_int(nir_builder *build, int x)
 246 {
 247    nir_const_value v;
 248
 249    memset(&v, 0, sizeof(v));
 250    v.i32[0] = x;
 251
 252    return nir_build_imm(build, 1, 32, v);
 253 }
 254
 255 static inline nir_ssa_def *
 256 nir_imm_int64(nir_builder *build, int64_t x)
 257 {
 258    nir_const_value v;
 259
 260    memset(&v, 0, sizeof(v));
 261    v.i64[0] = x;
 262
 263    return nir_build_imm(build, 1, 64, v);
 264 }
 265
 266 static inline nir_ssa_def *
 267 nir_imm_intN_t(nir_builder *build, uint64_t x, unsigned bit_size)
 268 {
 269    nir_const_value v;
 270
 271    memset(&v, 0, sizeof(v));
 272    assert(bit_size <= 64);
 273    v.i64[0] = x & (~0ull >> (64 - bit_size));
 274
 275    return nir_build_imm(build, 1, bit_size, v);
 276 }
 277
 278 static inline nir_ssa_def *
 279 nir_imm_ivec4(nir_builder *build, int x, int y, int z, int w)
 280 {
 281    nir_const_value v;
 282
 283    memset(&v, 0, sizeof(v));
 284    v.i32[0] = x;
 285    v.i32[1] = y;
 286    v.i32[2] = z;
 287    v.i32[3] = w;
 288
 289    return nir_build_imm(build, 4, 32, v);
 290 }
 291
 292 static inline nir_ssa_def *
 293 nir_build_alu(nir_builder *build, nir_op op, nir_ssa_def *src0,
 294               nir_ssa_def *src1, nir_ssa_def *src2, nir_ssa_def *src3)
 295 {
 296    const nir_op_info *op_info = &nir_op_infos[op];
 297    nir_alu_instr *instr = nir_alu_instr_create(build->shader, op);
 298    if (!instr)
 299       return NULL;
 300
 301    instr->exact = build->exact;
 302
 303    instr->src[0].src = nir_src_for_ssa(src0);
 304    if (src1)
 305       instr->src[1].src = nir_src_for_ssa(src1);
 306    if (src2)
 307       instr->src[2].src = nir_src_for_ssa(src2);
 308    if (src3)
 309       instr->src[3].src = nir_src_for_ssa(src3);
 310
 311    /* Guess the number of components the destination temporary should have
 312     * based on our input sizes, if it's not fixed for the op.
 313     */
 314    unsigned num_components = op_info->output_size;
 315    if (num_components == 0) {
 316       for (unsigned i = 0; i < op_info->num_inputs; i++) {
 317          if (op_info->input_sizes[i] == 0)
 318             num_components = MAX2(num_components,
 319                                   instr->src[i].src.ssa->num_components);
 320       }
 321    }
 322    assert(num_components != 0);
 323
 324    /* Figure out the bitwidth based on the source bitwidth if the instruction
 325     * is variable-width.
 326     */
 327    unsigned bit_size = nir_alu_type_get_type_size(op_info->output_type);
 328    if (bit_size == 0) {
 329       for (unsigned i = 0; i < op_info->num_inputs; i++) {
 330          unsigned src_bit_size = instr->src[i].src.ssa->bit_size;
 331          if (nir_alu_type_get_type_size(op_info->input_types[i]) == 0) {
 332             if (bit_size)
 333                assert(src_bit_size == bit_size);
 334             else
 335                bit_size = src_bit_size;
 336          } else {
 337             assert(src_bit_size ==
 338                nir_alu_type_get_type_size(op_info->input_types[i]));
 339          }
 340       }
 341    }
 342
 343    /* When in doubt, assume 32. */
 344    if (bit_size == 0)
 345       bit_size = 32;
 346
 347    /* Make sure we don't swizzle from outside of our source vector (like if a
 348     * scalar value was passed into a multiply with a vector).
 349     */
 350    for (unsigned i = 0; i < op_info->num_inputs; i++) {
 351       for (unsigned j = instr->src[i].src.ssa->num_components; j < 4; j++) {
 352          instr->src[i].swizzle[j] = instr->src[i].src.ssa->num_components - 1;
 353       }
 354    }
 355
 356    nir_ssa_dest_init(&instr->instr, &instr->dest.dest, num_components,
 357                      bit_size, NULL);
 358    instr->dest.write_mask = (1 << num_components) - 1;
 359
 360    nir_builder_instr_insert(build, &instr->instr);
 361
 362    return &instr->dest.dest.ssa;
 363 }
 364
 365 #include "nir_builder_opcodes.h"
 366
 367 static inline nir_ssa_def *
 368 nir_vec(nir_builder *build, nir_ssa_def **comp, unsigned num_components)
 369 {
 370    switch (num_components) {
 371    case 4:
 372       return nir_vec4(build, comp[0], comp[1], comp[2], comp[3]);
 373    case 3:
 374       return nir_vec3(build, comp[0], comp[1], comp[2]);
 375    case 2:
 376       return nir_vec2(build, comp[0], comp[1]);
 377    case 1:
 378       return comp[0];
 379    default:
 380       unreachable("bad component count");
 381       return NULL;
 382    }
 383 }
 384
 385 /**
 386  * Similar to nir_fmov, but takes a nir_alu_src instead of a nir_ssa_def.
 387  */
 388 static inline nir_ssa_def *
 389 nir_fmov_alu(nir_builder *build, nir_alu_src src, unsigned num_components)
 390 {
 391    nir_alu_instr *mov = nir_alu_instr_create(build->shader, nir_op_fmov);
 392    nir_ssa_dest_init(&mov->instr, &mov->dest.dest, num_components,
 393                      nir_src_bit_size(src.src), NULL);
 394    mov->exact = build->exact;
 395    mov->dest.write_mask = (1 << num_components) - 1;
 396    mov->src[0] = src;
 397    nir_builder_instr_insert(build, &mov->instr);
 398
 399    return &mov->dest.dest.ssa;
 400 }
 401
 402 static inline nir_ssa_def *
 403 nir_imov_alu(nir_builder *build, nir_alu_src src, unsigned num_components)
 404 {
 405    nir_alu_instr *mov = nir_alu_instr_create(build->shader, nir_op_imov);
 406    nir_ssa_dest_init(&mov->instr, &mov->dest.dest, num_components,
 407                      nir_src_bit_size(src.src), NULL);
 408    mov->exact = build->exact;
 409    mov->dest.write_mask = (1 << num_components) - 1;
 410    mov->src[0] = src;
 411    nir_builder_instr_insert(build, &mov->instr);
 412
 413    return &mov->dest.dest.ssa;
 414 }
 415
 416 /**
 417  * Construct an fmov or imov that reswizzles the source's components.
 418  */
 419 static inline nir_ssa_def *
 420 nir_swizzle(nir_builder *build, nir_ssa_def *src, const unsigned swiz[4],
 421             unsigned num_components, bool use_fmov)
 422 {
 423    nir_alu_src alu_src = { NIR_SRC_INIT };
 424    alu_src.src = nir_src_for_ssa(src);
 425    for (unsigned i = 0; i < num_components; i++)
 426       alu_src.swizzle[i] = swiz[i];
 427
 428    return use_fmov ? nir_fmov_alu(build, alu_src, num_components) :
 429                      nir_imov_alu(build, alu_src, num_components);
 430 }
 431
 432 /* Selects the right fdot given the number of components in each source. */
 433 static inline nir_ssa_def *
 434 nir_fdot(nir_builder *build, nir_ssa_def *src0, nir_ssa_def *src1)
 435 {
 436    assert(src0->num_components == src1->num_components);
 437    switch (src0->num_components) {
 438    case 1: return nir_fmul(build, src0, src1);
 439    case 2: return nir_fdot2(build, src0, src1);
 440    case 3: return nir_fdot3(build, src0, src1);
 441    case 4: return nir_fdot4(build, src0, src1);
 442    default:
 443       unreachable("bad component size");
 444    }
 445
 446    return NULL;
 447 }
 448
 449 static inline nir_ssa_def *
 450 nir_bany_inequal(nir_builder *b, nir_ssa_def *src0, nir_ssa_def *src1)
 451 {
 452    switch (src0->num_components) {
 453    case 1: return nir_ine(b, src0, src1);
 454    case 2: return nir_bany_inequal2(b, src0, src1);
 455    case 3: return nir_bany_inequal3(b, src0, src1);
 456    case 4: return nir_bany_inequal4(b, src0, src1);
 457    default:
 458       unreachable("bad component size");
 459    }
 460 }
 461
 462 static inline nir_ssa_def *
 463 nir_bany(nir_builder *b, nir_ssa_def *src)
 464 {
 465    return nir_bany_inequal(b, src, nir_imm_int(b, 0));
 466 }
 467
 468 static inline nir_ssa_def *
 469 nir_channel(nir_builder *b, nir_ssa_def *def, unsigned c)
 470 {
 471    unsigned swizzle[4] = {c, c, c, c};
 472    return nir_swizzle(b, def, swizzle, 1, false);
 473 }
 474
 475 static inline nir_ssa_def *
 476 nir_channels(nir_builder *b, nir_ssa_def *def, unsigned mask)
 477 {
 478    unsigned num_channels = 0, swizzle[4] = { 0, 0, 0, 0 };
 479
 480    for (unsigned i = 0; i < 4; i++) {
 481       if ((mask & (1 << i)) == 0)
 482          continue;
 483       swizzle[num_channels++] = i;
 484    }
 485
 486    return nir_swizzle(b, def, swizzle, num_channels, false);
 487 }
 488
 489 /**
 490  * Turns a nir_src into a nir_ssa_def * so it can be passed to
 491  * nir_build_alu()-based builder calls.
 492  *
 493  * See nir_ssa_for_alu_src() for alu instructions.
 494  */
 495 static inline nir_ssa_def *
 496 nir_ssa_for_src(nir_builder *build, nir_src src, int num_components)
 497 {
 498    if (src.is_ssa && src.ssa->num_components == num_components)
 499       return src.ssa;
 500
 501    nir_alu_src alu = { NIR_SRC_INIT };
 502    alu.src = src;
 503    for (int j = 0; j < 4; j++)
 504       alu.swizzle[j] = j;
 505
 506    return nir_imov_alu(build, alu, num_components);
 507 }
 508
 509 /**
 510  * Similar to nir_ssa_for_src(), but for alu srcs, respecting the
 511  * nir_alu_src's swizzle.
 512  */
 513 static inline nir_ssa_def *
 514 nir_ssa_for_alu_src(nir_builder *build, nir_alu_instr *instr, unsigned srcn)
 515 {
 516    static uint8_t trivial_swizzle[4] = { 0, 1, 2, 3 };
 517    nir_alu_src *src = &instr->src[srcn];
 518    unsigned num_components = nir_ssa_alu_instr_src_components(instr, srcn);
 519
 520    if (src->src.is_ssa && (src->src.ssa->num_components == num_components) &&
 521        !src->abs && !src->negate &&
 522        (memcmp(src->swizzle, trivial_swizzle, num_components) == 0))
 523       return src->src.ssa;
 524
 525    return nir_imov_alu(build, *src, num_components);
 526 }
 527
 528 static inline nir_ssa_def *
 529 nir_load_var(nir_builder *build, nir_variable *var)
 530 {
 531    const unsigned num_components = glsl_get_vector_elements(var->type);
 532
 533    nir_intrinsic_instr *load =
 534       nir_intrinsic_instr_create(build->shader, nir_intrinsic_load_var);
 535    load->num_components = num_components;
 536    load->variables[0] = nir_deref_var_create(load, var);
 537    nir_ssa_dest_init(&load->instr, &load->dest, num_components,
 538                      glsl_get_bit_size(var->type), NULL);
 539    nir_builder_instr_insert(build, &load->instr);
 540    return &load->dest.ssa;
 541 }
 542
 543 static inline nir_ssa_def *
 544 nir_load_deref_var(nir_builder *build, nir_deref_var *deref)
 545 {
 546    const struct glsl_type *type = nir_deref_tail(&deref->deref)->type;
 547    const unsigned num_components = glsl_get_vector_elements(type);
 548
 549    nir_intrinsic_instr *load =
 550       nir_intrinsic_instr_create(build->shader, nir_intrinsic_load_var);
 551    load->num_components = num_components;
 552    load->variables[0] = nir_deref_var_clone(deref, load);
 553    nir_ssa_dest_init(&load->instr, &load->dest, num_components,
 554                      glsl_get_bit_size(type), NULL);
 555    nir_builder_instr_insert(build, &load->instr);
 556    return &load->dest.ssa;
 557 }
 558
 559 static inline void
 560 nir_store_var(nir_builder *build, nir_variable *var, nir_ssa_def *value,
 561               unsigned writemask)
 562 {
 563    const unsigned num_components = glsl_get_vector_elements(var->type);
 564
 565    nir_intrinsic_instr *store =
 566       nir_intrinsic_instr_create(build->shader, nir_intrinsic_store_var);
 567    store->num_components = num_components;
 568    nir_intrinsic_set_write_mask(store, writemask);
 569    store->variables[0] = nir_deref_var_create(store, var);
 570    store->src[0] = nir_src_for_ssa(value);
 571    nir_builder_instr_insert(build, &store->instr);
 572 }
 573
 574 static inline void
 575 nir_store_deref_var(nir_builder *build, nir_deref_var *deref,
 576                     nir_ssa_def *value, unsigned writemask)
 577 {
 578    const unsigned num_components =
 579       glsl_get_vector_elements(nir_deref_tail(&deref->deref)->type);
 580
 581    nir_intrinsic_instr *store =
 582       nir_intrinsic_instr_create(build->shader, nir_intrinsic_store_var);
 583    store->num_components = num_components;
 584    store->const_index[0] = writemask & ((1 << num_components) - 1);
 585    store->variables[0] = nir_deref_var_clone(deref, store);
 586    store->src[0] = nir_src_for_ssa(value);
 587    nir_builder_instr_insert(build, &store->instr);
 588 }
 589
 590 static inline void
 591 nir_copy_deref_var(nir_builder *build, nir_deref_var *dest, nir_deref_var *src)
 592 {
 593    assert(nir_deref_tail(&dest->deref)->type ==
 594           nir_deref_tail(&src->deref)->type);
 595
 596    nir_intrinsic_instr *copy =
 597       nir_intrinsic_instr_create(build->shader, nir_intrinsic_copy_var);
 598    copy->variables[0] = nir_deref_var_clone(dest, copy);
 599    copy->variables[1] = nir_deref_var_clone(src, copy);
 600    nir_builder_instr_insert(build, &copy->instr);
 601 }
 602
 603 static inline void
 604 nir_copy_var(nir_builder *build, nir_variable *dest, nir_variable *src)
 605 {
 606    nir_intrinsic_instr *copy =
 607       nir_intrinsic_instr_create(build->shader, nir_intrinsic_copy_var);
 608    copy->variables[0] = nir_deref_var_create(copy, dest);
 609    copy->variables[1] = nir_deref_var_create(copy, src);
 610    nir_builder_instr_insert(build, &copy->instr);
 611 }
 612
 613 /* Generic builder for system values. */
 614 static inline nir_ssa_def *
 615 nir_load_system_value(nir_builder *build, nir_intrinsic_op op, int index)
 616 {
 617    nir_intrinsic_instr *load = nir_intrinsic_instr_create(build->shader, op);
 618    load->num_components = nir_intrinsic_infos[op].dest_components;
 619    load->const_index[0] = index;
 620    nir_ssa_dest_init(&load->instr, &load->dest,
 621                      nir_intrinsic_infos[op].dest_components, 32, NULL);
 622    nir_builder_instr_insert(build, &load->instr);
 623    return &load->dest.ssa;
 624 }
 625
 626 /* Generate custom builders for system values. */
 627 #define INTRINSIC(name, num_srcs, src_components, has_dest, dest_components, \
 628                   num_variables, num_indices, idx0, idx1, idx2, flags)
 629 #define LAST_INTRINSIC(name)
 630
 631 #define DEFINE_SYSTEM_VALUE(name)                                        \
 632    static inline nir_ssa_def *                                           \
 633    nir_load_##name(nir_builder *build)                                   \
 634    {                                                                     \
 635       return nir_load_system_value(build, nir_intrinsic_load_##name, 0); \
 636    }
 637
 638 #include "nir_intrinsics.h"
 639
 640 static inline nir_ssa_def *
 641 nir_load_barycentric(nir_builder *build, nir_intrinsic_op op,
 642                      unsigned interp_mode)
 643 {
 644    nir_intrinsic_instr *bary = nir_intrinsic_instr_create(build->shader, op);
 645    nir_ssa_dest_init(&bary->instr, &bary->dest, 2, 32, NULL);
 646    nir_intrinsic_set_interp_mode(bary, interp_mode);
 647    nir_builder_instr_insert(build, &bary->instr);
 648    return &bary->dest.ssa;
 649 }
 650
 651 static inline void
 652 nir_jump(nir_builder *build, nir_jump_type jump_type)
 653 {
 654    nir_jump_instr *jump = nir_jump_instr_create(build->shader, jump_type);
 655    nir_builder_instr_insert(build, &jump->instr);
 656 }
 657
 658 static inline nir_ssa_def *
 659 nir_compare_func(nir_builder *b, enum compare_func func,
 660                  nir_ssa_def *src0, nir_ssa_def *src1)
 661 {
 662    switch (func) {
 663    case COMPARE_FUNC_NEVER:
 664       return nir_imm_int(b, 0);
 665    case COMPARE_FUNC_ALWAYS:
 666       return nir_imm_int(b, ~0);
 667    case COMPARE_FUNC_EQUAL:
 668       return nir_feq(b, src0, src1);
 669    case COMPARE_FUNC_NOTEQUAL:
 670       return nir_fne(b, src0, src1);
 671    case COMPARE_FUNC_GREATER:
 672       return nir_flt(b, src1, src0);
 673    case COMPARE_FUNC_GEQUAL:
 674       return nir_fge(b, src0, src1);
 675    case COMPARE_FUNC_LESS:
 676       return nir_flt(b, src0, src1);
 677    case COMPARE_FUNC_LEQUAL:
 678       return nir_fge(b, src1, src0);
 679    }
 680    unreachable("bad compare func");
 681 }
 682
 683 #endif /* NIR_BUILDER_H */