src/gallium/drivers/lima/ir/pp/nir.c

   1 /*
   2  * Copyright (c) 2017 Lima Project
   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, sub license,
   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
  12  * next paragraph) shall be included in all copies or substantial portions
  13  * of the 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 NON-INFRINGEMENT. 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
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  */
  24
  25 #include <string.h>
  26
  27 #include "util/ralloc.h"
  28 #include "util/bitscan.h"
  29 #include "compiler/nir/nir.h"
  30
  31 #include "ppir.h"
  32
  33 static void *ppir_node_create_ssa(ppir_block *block, ppir_op op, nir_ssa_def *ssa)
  34 {
  35    ppir_node *node = ppir_node_create(block, op, ssa->index, 0);
  36    if (!node)
  37       return NULL;
  38
  39    ppir_dest *dest = ppir_node_get_dest(node);
  40    dest->type = ppir_target_ssa;
  41    dest->ssa.num_components = ssa->num_components;
  42    dest->ssa.live_in = INT_MAX;
  43    dest->ssa.live_out = 0;
  44    dest->write_mask = u_bit_consecutive(0, ssa->num_components);
  45
  46    if (node->type == ppir_node_type_load ||
  47        node->type == ppir_node_type_store)
  48       dest->ssa.is_head = true;
  49
  50    return node;
  51 }
  52
  53 static void *ppir_node_create_reg(ppir_block *block, ppir_op op,
  54                                   nir_reg_dest *reg, unsigned mask)
  55 {
  56    ppir_node *node = ppir_node_create(block, op, reg->reg->index, mask);
  57    if (!node)
  58       return NULL;
  59
  60    ppir_dest *dest = ppir_node_get_dest(node);
  61
  62    list_for_each_entry(ppir_reg, r, &block->comp->reg_list, list) {
  63       if (r->index == reg->reg->index) {
  64          dest->reg = r;
  65          break;
  66       }
  67    }
  68
  69    dest->type = ppir_target_register;
  70    dest->write_mask = mask;
  71
  72    if (node->type == ppir_node_type_load ||
  73        node->type == ppir_node_type_store)
  74       dest->reg->is_head = true;
  75
  76    return node;
  77 }
  78
  79 static void *ppir_node_create_dest(ppir_block *block, ppir_op op,
  80                                    nir_dest *dest, unsigned mask)
  81 {
  82    unsigned index = -1;
  83
  84    if (dest) {
  85       if (dest->is_ssa)
  86          return ppir_node_create_ssa(block, op, &dest->ssa);
  87       else
  88          return ppir_node_create_reg(block, op, &dest->reg, mask);
  89    }
  90
  91    return ppir_node_create(block, op, index, 0);
  92 }
  93
  94 static void ppir_node_add_src(ppir_compiler *comp, ppir_node *node,
  95                               ppir_src *ps, nir_src *ns, unsigned mask)
  96 {
  97    ppir_node *child = NULL;
  98
  99    if (ns->is_ssa) {
 100       child = comp->var_nodes[ns->ssa->index];
 101       ppir_node_add_dep(node, child);
 102    }
 103    else {
 104       nir_register *reg = ns->reg.reg;
 105       while (mask) {
 106          int swizzle = ps->swizzle[u_bit_scan(&mask)];
 107          child = comp->var_nodes[(reg->index << 2) + comp->reg_base + swizzle];
 108          ppir_node_add_dep(node, child);
 109       }
 110    }
 111
 112    ppir_dest *dest = ppir_node_get_dest(child);
 113    ppir_node_target_assign(ps, dest);
 114 }
 115
 116 static int nir_to_ppir_opcodes[nir_num_opcodes] = {
 117    /* not supported */
 118    [0 ... nir_last_opcode] = -1,
 119
 120    [nir_op_fmov] = ppir_op_mov,
 121    [nir_op_imov] = ppir_op_mov,
 122    [nir_op_fmul] = ppir_op_mul,
 123    [nir_op_fadd] = ppir_op_add,
 124    [nir_op_fdot2] = ppir_op_dot2,
 125    [nir_op_fdot3] = ppir_op_dot3,
 126    [nir_op_fdot4] = ppir_op_dot4,
 127    [nir_op_frsq] = ppir_op_rsqrt,
 128    [nir_op_flog2] = ppir_op_log2,
 129    [nir_op_fexp2] = ppir_op_exp2,
 130    [nir_op_fsqrt] = ppir_op_sqrt,
 131    [nir_op_fsin] = ppir_op_sin,
 132    [nir_op_fcos] = ppir_op_cos,
 133    [nir_op_fmax] = ppir_op_max,
 134    [nir_op_fmin] = ppir_op_min,
 135    [nir_op_frcp] = ppir_op_rcp,
 136    [nir_op_ffloor] = ppir_op_floor,
 137    [nir_op_fceil] = ppir_op_ceil,
 138    [nir_op_ffract] = ppir_op_fract,
 139    [nir_op_fand] = ppir_op_and,
 140    [nir_op_for] = ppir_op_or,
 141    [nir_op_fxor] = ppir_op_xor,
 142    [nir_op_sge] = ppir_op_ge,
 143    [nir_op_fge] = ppir_op_ge,
 144    [nir_op_slt] = ppir_op_lt,
 145    [nir_op_flt] = ppir_op_lt,
 146    [nir_op_seq] = ppir_op_eq,
 147    [nir_op_feq] = ppir_op_eq,
 148    [nir_op_sne] = ppir_op_ne,
 149    [nir_op_fne] = ppir_op_ne,
 150    [nir_op_fnot] = ppir_op_not,
 151    [nir_op_fcsel] = ppir_op_select,
 152    [nir_op_inot] = ppir_op_not,
 153 };
 154
 155 static ppir_node *ppir_emit_alu(ppir_block *block, nir_instr *ni)
 156 {
 157    nir_alu_instr *instr = nir_instr_as_alu(ni);
 158    int op = nir_to_ppir_opcodes[instr->op];
 159
 160    if (op < 0) {
 161       ppir_error("unsupported nir_op: %s\n", nir_op_infos[instr->op].name);
 162       return NULL;
 163    }
 164
 165    ppir_alu_node *node = ppir_node_create_dest(block, op, &instr->dest.dest,
 166                                                instr->dest.write_mask);
 167    if (!node)
 168       return NULL;
 169
 170    ppir_dest *pd = &node->dest;
 171    nir_alu_dest *nd = &instr->dest;
 172    if (nd->saturate)
 173       pd->modifier = ppir_outmod_clamp_fraction;
 174
 175    unsigned src_mask;
 176    switch (op) {
 177    case ppir_op_dot2:
 178       src_mask = 0b0011;
 179       break;
 180    case ppir_op_dot3:
 181       src_mask = 0b0111;
 182       break;
 183    case ppir_op_dot4:
 184       src_mask = 0b1111;
 185       break;
 186    default:
 187       src_mask = pd->write_mask;
 188       break;
 189    }
 190
 191    unsigned num_child = nir_op_infos[instr->op].num_inputs;
 192    node->num_src = num_child;
 193
 194    for (int i = 0; i < num_child; i++) {
 195       nir_alu_src *ns = instr->src + i;
 196       ppir_src *ps = node->src + i;
 197       memcpy(ps->swizzle, ns->swizzle, sizeof(ps->swizzle));
 198       ppir_node_add_src(block->comp, &node->node, ps, &ns->src, src_mask);
 199
 200       ps->absolute = ns->abs;
 201       ps->negate = ns->negate;
 202    }
 203
 204    return &node->node;
 205 }
 206
 207 static ppir_node *ppir_emit_intrinsic(ppir_block *block, nir_instr *ni)
 208 {
 209    nir_intrinsic_instr *instr = nir_instr_as_intrinsic(ni);
 210    unsigned mask = 0;
 211    ppir_load_node *lnode;
 212    ppir_store_node *snode;
 213
 214    switch (instr->intrinsic) {
 215    case nir_intrinsic_load_input:
 216       if (!instr->dest.is_ssa)
 217          mask = u_bit_consecutive(0, instr->num_components);
 218
 219       lnode = ppir_node_create_dest(block, ppir_op_load_varying, &instr->dest, mask);
 220       if (!lnode)
 221          return NULL;
 222
 223       lnode->num_components = instr->num_components;
 224       lnode->index = nir_intrinsic_base(instr) * 4 + nir_intrinsic_component(instr);
 225       return &lnode->node;
 226
 227    case nir_intrinsic_load_frag_coord:
 228       if (!instr->dest.is_ssa)
 229          mask = u_bit_consecutive(0, instr->num_components);
 230
 231       lnode = ppir_node_create_dest(block, ppir_op_load_fragcoord, &instr->dest, mask);
 232       if (!lnode)
 233          return NULL;
 234
 235       lnode->num_components = instr->num_components;
 236       return &lnode->node;
 237
 238    case nir_intrinsic_load_uniform:
 239       if (!instr->dest.is_ssa)
 240          mask = u_bit_consecutive(0, instr->num_components);
 241
 242       lnode = ppir_node_create_dest(block, ppir_op_load_uniform, &instr->dest, mask);
 243       if (!lnode)
 244          return NULL;
 245
 246       lnode->num_components = instr->num_components;
 247       lnode->index = nir_intrinsic_base(instr);
 248       lnode->index += (uint32_t)nir_src_as_float(instr->src[0]);
 249
 250       return &lnode->node;
 251
 252    case nir_intrinsic_store_output:
 253       snode = ppir_node_create_dest(block, ppir_op_store_color, NULL, 0);
 254       if (!snode)
 255          return NULL;
 256
 257       snode->index = nir_intrinsic_base(instr);
 258
 259       for (int i = 0; i < instr->num_components; i++)
 260          snode->src.swizzle[i] = i;
 261
 262       ppir_node_add_src(block->comp, &snode->node, &snode->src, instr->src,
 263                         u_bit_consecutive(0, instr->num_components));
 264
 265       return &snode->node;
 266
 267    default:
 268       ppir_error("unsupported nir_intrinsic_instr %d\n", instr->intrinsic);
 269       return NULL;
 270    }
 271 }
 272
 273 static ppir_node *ppir_emit_load_const(ppir_block *block, nir_instr *ni)
 274 {
 275    nir_load_const_instr *instr = nir_instr_as_load_const(ni);
 276    ppir_const_node *node = ppir_node_create_ssa(block, ppir_op_const, &instr->def);
 277    if (!node)
 278       return NULL;
 279
 280    assert(instr->def.bit_size == 32);
 281
 282    for (int i = 0; i < instr->def.num_components; i++)
 283       node->constant.value[i].i = instr->value[i].i32;
 284    node->constant.num = instr->def.num_components;
 285
 286    return &node->node;
 287 }
 288
 289 static ppir_node *ppir_emit_ssa_undef(ppir_block *block, nir_instr *ni)
 290 {
 291    ppir_error("nir_ssa_undef_instr not support\n");
 292    return NULL;
 293 }
 294
 295 static ppir_node *ppir_emit_tex(ppir_block *block, nir_instr *ni)
 296 {
 297    nir_tex_instr *instr = nir_instr_as_tex(ni);
 298    ppir_load_texture_node *node;
 299
 300    if (instr->op != nir_texop_tex) {
 301       ppir_error("unsupported texop %d\n", instr->op);
 302       return NULL;
 303    }
 304
 305    node = ppir_node_create_dest(block, ppir_op_load_texture, &instr->dest, 0);
 306    if (!node)
 307       return NULL;
 308
 309    node->sampler = instr->texture_index;
 310
 311    switch (instr->sampler_dim) {
 312    case GLSL_SAMPLER_DIM_2D:
 313    case GLSL_SAMPLER_DIM_RECT:
 314    case GLSL_SAMPLER_DIM_EXTERNAL:
 315       break;
 316    default:
 317       ppir_debug("unsupported sampler dim: %d\n", instr->sampler_dim);
 318       return NULL;
 319    }
 320
 321    node->sampler_dim = instr->sampler_dim;
 322
 323    for (int i = 0; i < instr->coord_components; i++)
 324          node->src_coords.swizzle[i] = i;
 325
 326    assert(instr->num_srcs == 1);
 327    for (int i = 0; i < instr->num_srcs; i++) {
 328       switch (instr->src[i].src_type) {
 329       case nir_tex_src_coord:
 330          ppir_node_add_src(block->comp, &node->node, &node->src_coords, &instr->src[i].src,
 331                            u_bit_consecutive(0, instr->coord_components));
 332          break;
 333       default:
 334          ppir_debug("unknown texture source");
 335          return NULL;
 336       }
 337    }
 338
 339    return &node->node;
 340 }
 341
 342 static ppir_node *ppir_emit_jump(ppir_block *block, nir_instr *ni)
 343 {
 344    ppir_error("nir_jump_instr not support\n");
 345    return NULL;
 346 }
 347
 348 static ppir_node *(*ppir_emit_instr[nir_instr_type_phi])(ppir_block *, nir_instr *) = {
 349    [nir_instr_type_alu]        = ppir_emit_alu,
 350    [nir_instr_type_intrinsic]  = ppir_emit_intrinsic,
 351    [nir_instr_type_load_const] = ppir_emit_load_const,
 352    [nir_instr_type_ssa_undef]  = ppir_emit_ssa_undef,
 353    [nir_instr_type_tex]        = ppir_emit_tex,
 354    [nir_instr_type_jump]       = ppir_emit_jump,
 355 };
 356
 357 static ppir_block *ppir_block_create(ppir_compiler *comp)
 358 {
 359    ppir_block *block = rzalloc(comp, ppir_block);
 360    if (!block)
 361       return NULL;
 362
 363    list_inithead(&block->node_list);
 364    list_inithead(&block->instr_list);
 365
 366    return block;
 367 }
 368
 369 static bool ppir_emit_block(ppir_compiler *comp, nir_block *nblock)
 370 {
 371    ppir_block *block = ppir_block_create(comp);
 372    if (!block)
 373       return false;
 374
 375    list_addtail(&block->list, &comp->block_list);
 376    block->comp = comp;
 377
 378    nir_foreach_instr(instr, nblock) {
 379       assert(instr->type < nir_instr_type_phi);
 380       ppir_node *node = ppir_emit_instr[instr->type](block, instr);
 381       if (node)
 382          list_addtail(&node->list, &block->node_list);
 383    }
 384
 385    return true;
 386 }
 387
 388 static bool ppir_emit_if(ppir_compiler *comp, nir_if *nif)
 389 {
 390    ppir_error("if nir_cf_node not support\n");
 391    return false;
 392 }
 393
 394 static bool ppir_emit_loop(ppir_compiler *comp, nir_loop *nloop)
 395 {
 396    ppir_error("loop nir_cf_node not support\n");
 397    return false;
 398 }
 399
 400 static bool ppir_emit_function(ppir_compiler *comp, nir_function_impl *nfunc)
 401 {
 402    ppir_error("function nir_cf_node not support\n");
 403    return false;
 404 }
 405
 406 static bool ppir_emit_cf_list(ppir_compiler *comp, struct exec_list *list)
 407 {
 408    foreach_list_typed(nir_cf_node, node, node, list) {
 409       bool ret;
 410
 411       switch (node->type) {
 412       case nir_cf_node_block:
 413          ret = ppir_emit_block(comp, nir_cf_node_as_block(node));
 414          break;
 415       case nir_cf_node_if:
 416          ret = ppir_emit_if(comp, nir_cf_node_as_if(node));
 417          break;
 418       case nir_cf_node_loop:
 419          ret = ppir_emit_loop(comp, nir_cf_node_as_loop(node));
 420          break;
 421       case nir_cf_node_function:
 422          ret = ppir_emit_function(comp, nir_cf_node_as_function(node));
 423          break;
 424       default:
 425          ppir_error("unknown NIR node type %d\n", node->type);
 426          return false;
 427       }
 428
 429       if (!ret)
 430          return false;
 431    }
 432
 433    return true;
 434 }
 435
 436 static ppir_compiler *ppir_compiler_create(void *prog, unsigned num_reg, unsigned num_ssa)
 437 {
 438    ppir_compiler *comp = rzalloc_size(
 439       prog, sizeof(*comp) + ((num_reg << 2) + num_ssa) * sizeof(ppir_node *));
 440    if (!comp)
 441       return NULL;
 442
 443    list_inithead(&comp->block_list);
 444    list_inithead(&comp->reg_list);
 445
 446    comp->var_nodes = (ppir_node **)(comp + 1);
 447    comp->reg_base = num_ssa;
 448    comp->prog = prog;
 449    return comp;
 450 }
 451
 452 bool ppir_compile_nir(struct lima_fs_shader_state *prog, struct nir_shader *nir,
 453                       struct ra_regs *ra)
 454 {
 455    nir_function_impl *func = nir_shader_get_entrypoint(nir);
 456    ppir_compiler *comp = ppir_compiler_create(prog, func->reg_alloc, func->ssa_alloc);
 457    if (!comp)
 458       return false;
 459
 460    comp->ra = ra;
 461
 462    foreach_list_typed(nir_register, reg, node, &func->registers) {
 463       ppir_reg *r = rzalloc(comp, ppir_reg);
 464       if (!r)
 465          return false;
 466
 467       r->index = reg->index;
 468       r->num_components = reg->num_components;
 469       r->live_in = INT_MAX;
 470       r->live_out = 0;
 471       r->is_head = false;
 472       list_addtail(&r->list, &comp->reg_list);
 473    }
 474
 475    if (!ppir_emit_cf_list(comp, &func->body))
 476       goto err_out0;
 477    ppir_node_print_prog(comp);
 478
 479    if (!ppir_lower_prog(comp))
 480       goto err_out0;
 481
 482    if (!ppir_node_to_instr(comp))
 483       goto err_out0;
 484
 485    if (!ppir_schedule_prog(comp))
 486       goto err_out0;
 487
 488    if (!ppir_regalloc_prog(comp))
 489       goto err_out0;
 490
 491    if (!ppir_codegen_prog(comp))
 492       goto err_out0;
 493
 494    ralloc_free(comp);
 495    return true;
 496
 497 err_out0:
 498    ralloc_free(comp);
 499    return false;
 500 }
 501