src/gallium/auxiliary/gallivm/lp_bld_tgsi.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2011-2012 Advanced Micro Devices, Inc.
   4  * Copyright 2010 VMware, Inc.
   5  * Copyright 2009 VMware, Inc.
   6  * Copyright 2007-2008 VMware, Inc.
   7  * All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the
  11  * "Software"), to deal in the Software without restriction, including
  12  * without limitation the rights to use, copy, modify, merge, publish,
  13  * distribute, sub license, and/or sell copies of the Software, and to
  14  * permit persons to whom the Software is furnished to do so, subject to
  15  * the following conditions:
  16  *
  17  * The above copyright notice and this permission notice (including the
  18  * next paragraph) shall be included in all copies or substantial portions
  19  * of the Software.
  20  *
  21  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  22  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  24  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  25  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  26  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  27  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28  *
  29  **************************************************************************/
  30
  31 #include "gallivm/lp_bld_tgsi.h"
  32
  33 #include "gallivm/lp_bld_arit.h"
  34 #include "gallivm/lp_bld_gather.h"
  35 #include "gallivm/lp_bld_init.h"
  36 #include "gallivm/lp_bld_intr.h"
  37 #include "tgsi/tgsi_info.h"
  38 #include "tgsi/tgsi_parse.h"
  39 #include "tgsi/tgsi_util.h"
  40 #include "util/u_memory.h"
  41
  42 /* The user is responsible for freeing list->instructions */
  43 unsigned lp_bld_tgsi_list_init(struct lp_build_tgsi_context * bld_base)
  44 {
  45    bld_base->instructions = (struct tgsi_full_instruction *)
  46          MALLOC( LP_MAX_INSTRUCTIONS * sizeof(struct tgsi_full_instruction) );
  47    if (!bld_base->instructions) {
  48       return 0;
  49    }
  50    bld_base->max_instructions = LP_MAX_INSTRUCTIONS;
  51    return 1;
  52 }
  53
  54
  55 unsigned lp_bld_tgsi_add_instruction(
  56    struct lp_build_tgsi_context * bld_base,
  57    const struct tgsi_full_instruction *inst_to_add)
  58 {
  59
  60    if (bld_base->num_instructions == bld_base->max_instructions) {
  61       struct tgsi_full_instruction *instructions;
  62       instructions = REALLOC(bld_base->instructions, bld_base->max_instructions
  63                                       * sizeof(struct tgsi_full_instruction),
  64                                       (bld_base->max_instructions + LP_MAX_INSTRUCTIONS)
  65                                       * sizeof(struct tgsi_full_instruction));
  66       if (!instructions) {
  67          return 0;
  68       }
  69       bld_base->instructions = instructions;
  70       bld_base->max_instructions += LP_MAX_INSTRUCTIONS;
  71    }
  72    memcpy(bld_base->instructions + bld_base->num_instructions, inst_to_add,
  73           sizeof(bld_base->instructions[0]));
  74
  75    bld_base->num_instructions++;
  76
  77    return 1;
  78 }
  79
  80
  81 /**
  82  * This function assumes that all the args in emit_data have been set.
  83  */
  84 static void
  85 lp_build_action_set_dst_type(
  86    struct lp_build_emit_data * emit_data,
  87    struct lp_build_tgsi_context *bld_base,
  88    unsigned tgsi_opcode)
  89 {
  90    if (emit_data->arg_count == 0) {
  91       emit_data->dst_type = LLVMVoidTypeInContext(bld_base->base.gallivm->context);
  92    } else {
  93       /* XXX: Not all opcodes have the same src and dst types. */
  94       emit_data->dst_type = LLVMTypeOf(emit_data->args[0]);
  95    }
  96 }
  97
  98 void
  99 lp_build_tgsi_intrinsic(
 100  const struct lp_build_tgsi_action * action,
 101  struct lp_build_tgsi_context * bld_base,
 102  struct lp_build_emit_data * emit_data)
 103 {
 104    struct lp_build_context * base = &bld_base->base;
 105    emit_data->output[emit_data->chan] = lp_build_intrinsic(
 106                base->gallivm->builder, action->intr_name,
 107                emit_data->dst_type, emit_data->args, emit_data->arg_count, 0);
 108 }
 109
 110 LLVMValueRef
 111 lp_build_emit_llvm(
 112    struct lp_build_tgsi_context *bld_base,
 113    unsigned tgsi_opcode,
 114    struct lp_build_emit_data * emit_data)
 115 {
 116    struct lp_build_tgsi_action * action = &bld_base->op_actions[tgsi_opcode];
 117    /* XXX: Assert that this is a componentwise or replicate instruction */
 118
 119    lp_build_action_set_dst_type(emit_data, bld_base, tgsi_opcode);
 120    emit_data->chan = 0;
 121    assert(action->emit);
 122    action->emit(action, bld_base, emit_data);
 123    return emit_data->output[0];
 124 }
 125
 126 LLVMValueRef
 127 lp_build_emit_llvm_unary(
 128    struct lp_build_tgsi_context *bld_base,
 129    unsigned tgsi_opcode,
 130    LLVMValueRef arg0)
 131 {
 132    struct lp_build_emit_data emit_data = {{0}};
 133    emit_data.info = tgsi_get_opcode_info(tgsi_opcode);
 134    emit_data.arg_count = 1;
 135    emit_data.args[0] = arg0;
 136    return lp_build_emit_llvm(bld_base, tgsi_opcode, &emit_data);
 137 }
 138
 139 LLVMValueRef
 140 lp_build_emit_llvm_binary(
 141    struct lp_build_tgsi_context *bld_base,
 142    unsigned tgsi_opcode,
 143    LLVMValueRef arg0,
 144    LLVMValueRef arg1)
 145 {
 146    struct lp_build_emit_data emit_data = {{0}};
 147    emit_data.info = tgsi_get_opcode_info(tgsi_opcode);
 148    emit_data.arg_count = 2;
 149    emit_data.args[0] = arg0;
 150    emit_data.args[1] = arg1;
 151    return lp_build_emit_llvm(bld_base, tgsi_opcode, &emit_data);
 152 }
 153
 154 LLVMValueRef
 155 lp_build_emit_llvm_ternary(
 156    struct lp_build_tgsi_context *bld_base,
 157    unsigned tgsi_opcode,
 158    LLVMValueRef arg0,
 159    LLVMValueRef arg1,
 160    LLVMValueRef arg2)
 161 {
 162    struct lp_build_emit_data emit_data = {{0}};
 163    emit_data.info = tgsi_get_opcode_info(tgsi_opcode);
 164    emit_data.arg_count = 3;
 165    emit_data.args[0] = arg0;
 166    emit_data.args[1] = arg1;
 167    emit_data.args[2] = arg2;
 168    return lp_build_emit_llvm(bld_base, tgsi_opcode, &emit_data);
 169 }
 170
 171 /**
 172  * The default fetch implementation.
 173  */
 174 void lp_build_fetch_args(
 175    struct lp_build_tgsi_context * bld_base,
 176    struct lp_build_emit_data * emit_data)
 177 {
 178    unsigned src;
 179    for (src = 0; src < emit_data->info->num_src; src++) {
 180       emit_data->args[src] = lp_build_emit_fetch(bld_base, emit_data->inst, src,
 181                                                  emit_data->src_chan);
 182    }
 183    emit_data->arg_count = emit_data->info->num_src;
 184    lp_build_action_set_dst_type(emit_data, bld_base,
 185                 emit_data->inst->Instruction.Opcode);
 186 }
 187
 188 /**
 189  * with doubles src and dst channels aren't 1:1.
 190  * check the src/dst types for the opcode,
 191  * 1. if neither is double then src == dst;
 192  * 2. if dest is double
 193  *     - don't store to y or w
 194  *     - if src is double then src == dst.
 195  *     - else for f2d, d.xy = s.x
 196  *     - else for f2d, d.zw = s.y
 197  * 3. if dst is single, src is double
 198  *    - map dst x,z to src xy;
 199  *    - map dst y,w to src zw;
 200  */
 201 static int get_src_chan_idx(unsigned opcode,
 202                             int dst_chan_index)
 203 {
 204    enum tgsi_opcode_type dtype = tgsi_opcode_infer_dst_type(opcode);
 205    enum tgsi_opcode_type stype = tgsi_opcode_infer_src_type(opcode);
 206
 207    if (dtype != TGSI_TYPE_DOUBLE && stype != TGSI_TYPE_DOUBLE)
 208       return dst_chan_index;
 209    if (dtype == TGSI_TYPE_DOUBLE) {
 210       if (dst_chan_index == 1 || dst_chan_index == 3)
 211          return -1;
 212       if (stype == TGSI_TYPE_DOUBLE)
 213          return dst_chan_index;
 214       if (dst_chan_index == 0)
 215          return 0;
 216       if (dst_chan_index == 2)
 217          return 1;
 218    } else {
 219       if (dst_chan_index == 0 || dst_chan_index == 2)
 220          return 0;
 221       if (dst_chan_index == 1 || dst_chan_index == 3)
 222          return 2;
 223    }
 224    return -1;
 225 }
 226
 227 /* XXX: COMMENT
 228  * It should be assumed that this function ignores writemasks
 229  */
 230 boolean
 231 lp_build_tgsi_inst_llvm(
 232    struct lp_build_tgsi_context * bld_base,
 233    const struct tgsi_full_instruction * inst)
 234 {
 235    unsigned tgsi_opcode = inst->Instruction.Opcode;
 236    const struct tgsi_opcode_info * info = tgsi_get_opcode_info(tgsi_opcode);
 237    const struct lp_build_tgsi_action * action =
 238                                          &bld_base->op_actions[tgsi_opcode];
 239    struct lp_build_emit_data emit_data;
 240    unsigned chan_index;
 241    LLVMValueRef val;
 242    bld_base->pc++;
 243
 244    if (bld_base->emit_debug) {
 245       bld_base->emit_debug(bld_base, inst, info);
 246    }
 247
 248    /* Ignore deprecated instructions */
 249    switch (inst->Instruction.Opcode) {
 250
 251    case TGSI_OPCODE_UP2US:
 252    case TGSI_OPCODE_UP4B:
 253    case TGSI_OPCODE_UP4UB:
 254    case TGSI_OPCODE_PUSHA:
 255    case TGSI_OPCODE_POPA:
 256    case TGSI_OPCODE_SAD:
 257       /* deprecated? */
 258       assert(0);
 259       return FALSE;
 260       break;
 261    }
 262
 263    /* Check if the opcode has been implemented */
 264    if (!action->emit) {
 265       return FALSE;
 266    }
 267
 268    memset(&emit_data, 0, sizeof(emit_data));
 269
 270    assert(info->num_dst <= 1);
 271    if (info->num_dst) {
 272       TGSI_FOR_EACH_DST0_ENABLED_CHANNEL( inst, chan_index ) {
 273          emit_data.output[chan_index] = bld_base->base.undef;
 274       }
 275    }
 276
 277    emit_data.inst = inst;
 278    emit_data.info = info;
 279
 280    /* Emit the instructions */
 281    if (info->output_mode == TGSI_OUTPUT_COMPONENTWISE && bld_base->soa) {
 282       TGSI_FOR_EACH_DST0_ENABLED_CHANNEL(inst, chan_index) {
 283          int src_index = get_src_chan_idx(inst->Instruction.Opcode, chan_index);
 284          /* ignore channels 1/3 in double dst */
 285          if (src_index == -1)
 286             continue;
 287          emit_data.chan = chan_index;
 288          emit_data.src_chan = src_index;
 289          if (!action->fetch_args) {
 290             lp_build_fetch_args(bld_base, &emit_data);
 291          } else {
 292              action->fetch_args(bld_base, &emit_data);
 293          }
 294          action->emit(action, bld_base, &emit_data);
 295       }
 296    } else {
 297       emit_data.chan = LP_CHAN_ALL;
 298       if (action->fetch_args) {
 299          action->fetch_args(bld_base, &emit_data);
 300       }
 301       /* Make sure the output value is stored in emit_data.output[0], unless
 302        * the opcode is channel dependent */
 303       if (info->output_mode != TGSI_OUTPUT_CHAN_DEPENDENT) {
 304          emit_data.chan = 0;
 305       }
 306       action->emit(action, bld_base, &emit_data);
 307
 308       /* Replicate the output values */
 309       if (info->output_mode == TGSI_OUTPUT_REPLICATE && bld_base->soa) {
 310          val = emit_data.output[0];
 311          memset(emit_data.output, 0, sizeof(emit_data.output));
 312          TGSI_FOR_EACH_DST0_ENABLED_CHANNEL(inst, chan_index) {
 313             emit_data.output[chan_index] = val;
 314          }
 315       }
 316    }
 317
 318    if (info->num_dst > 0) {
 319       bld_base->emit_store(bld_base, inst, info, emit_data.output);
 320    }
 321    return TRUE;
 322 }
 323
 324
 325 LLVMValueRef
 326 lp_build_emit_fetch(
 327    struct lp_build_tgsi_context *bld_base,
 328    const struct tgsi_full_instruction *inst,
 329    unsigned src_op,
 330    const unsigned chan_index)
 331 {
 332    const struct tgsi_full_src_register *reg = &inst->Src[src_op];
 333    unsigned swizzle;
 334    LLVMValueRef res;
 335    enum tgsi_opcode_type stype = tgsi_opcode_infer_src_type(inst->Instruction.Opcode);
 336
 337    if (chan_index == LP_CHAN_ALL) {
 338       swizzle = ~0;
 339    } else {
 340       swizzle = tgsi_util_get_full_src_register_swizzle(reg, chan_index);
 341       if (swizzle > 3) {
 342          assert(0 && "invalid swizzle in emit_fetch()");
 343          return bld_base->base.undef;
 344       }
 345    }
 346
 347    assert(reg->Register.Index <= bld_base->info->file_max[reg->Register.File]);
 348
 349    if (bld_base->emit_fetch_funcs[reg->Register.File]) {
 350       res = bld_base->emit_fetch_funcs[reg->Register.File](bld_base, reg, stype,
 351                                                            swizzle);
 352    } else {
 353       assert(0 && "invalid src register in emit_fetch()");
 354       return bld_base->base.undef;
 355    }
 356
 357    if (reg->Register.Absolute) {
 358       switch (stype) {
 359       case TGSI_TYPE_FLOAT:
 360       case TGSI_TYPE_DOUBLE:
 361       case TGSI_TYPE_UNTYPED:
 362           /* modifiers on movs assume data is float */
 363          res = lp_build_emit_llvm_unary(bld_base, TGSI_OPCODE_ABS, res);
 364          break;
 365       case TGSI_TYPE_UNSIGNED:
 366       case TGSI_TYPE_SIGNED:
 367       case TGSI_TYPE_VOID:
 368       default:
 369          /* abs modifier is only legal on floating point types */
 370          assert(0);
 371          break;
 372       }
 373    }
 374
 375    if (reg->Register.Negate) {
 376       switch (stype) {
 377       case TGSI_TYPE_FLOAT:
 378       case TGSI_TYPE_UNTYPED:
 379          /* modifiers on movs assume data is float */
 380          res = lp_build_negate( &bld_base->base, res );
 381          break;
 382       case TGSI_TYPE_DOUBLE:
 383          /* no double build context */
 384          assert(0);
 385          break;
 386       case TGSI_TYPE_SIGNED:
 387       case TGSI_TYPE_UNSIGNED:
 388          res = lp_build_negate( &bld_base->int_bld, res );
 389          break;
 390       case TGSI_TYPE_VOID:
 391       default:
 392          assert(0);
 393          break;
 394       }
 395    }
 396
 397    /*
 398     * Swizzle the argument
 399     */
 400
 401    if (swizzle == ~0) {
 402       res = bld_base->emit_swizzle(bld_base, res,
 403                      reg->Register.SwizzleX,
 404                      reg->Register.SwizzleY,
 405                      reg->Register.SwizzleZ,
 406                      reg->Register.SwizzleW);
 407    }
 408
 409    return res;
 410
 411 }
 412
 413
 414 LLVMValueRef
 415 lp_build_emit_fetch_texoffset(
 416    struct lp_build_tgsi_context *bld_base,
 417    const struct tgsi_full_instruction *inst,
 418    unsigned tex_off_op,
 419    const unsigned chan_index)
 420 {
 421    const struct tgsi_texture_offset *off = &inst->TexOffsets[tex_off_op];
 422    struct tgsi_full_src_register reg;
 423    unsigned swizzle;
 424    LLVMValueRef res;
 425    enum tgsi_opcode_type stype = TGSI_TYPE_SIGNED;
 426
 427    /* convert offset "register" to ordinary register so can use normal emit funcs */
 428    memset(&reg, 0, sizeof(reg));
 429    reg.Register.File = off->File;
 430    reg.Register.Index = off->Index;
 431    reg.Register.SwizzleX = off->SwizzleX;
 432    reg.Register.SwizzleY = off->SwizzleY;
 433    reg.Register.SwizzleZ = off->SwizzleZ;
 434
 435    if (chan_index == LP_CHAN_ALL) {
 436       swizzle = ~0;
 437    } else {
 438       assert(chan_index < TGSI_SWIZZLE_W);
 439       swizzle = tgsi_util_get_src_register_swizzle(&reg.Register, chan_index);
 440    }
 441
 442    assert(off->Index <= bld_base->info->file_max[off->File]);
 443
 444    if (bld_base->emit_fetch_funcs[off->File]) {
 445       res = bld_base->emit_fetch_funcs[off->File](bld_base, &reg, stype,
 446                                                            swizzle);
 447    } else {
 448       assert(0 && "invalid src register in emit_fetch_texoffset()");
 449       return bld_base->base.undef;
 450    }
 451
 452    /*
 453     * Swizzle the argument
 454     */
 455
 456    if (swizzle == ~0) {
 457       res = bld_base->emit_swizzle(bld_base, res,
 458                                    off->SwizzleX,
 459                                    off->SwizzleY,
 460                                    off->SwizzleZ,
 461                                    /* there's no 4th channel */
 462                                    off->SwizzleX);
 463    }
 464
 465    return res;
 466
 467 }
 468
 469
 470 boolean
 471 lp_build_tgsi_llvm(
 472    struct lp_build_tgsi_context * bld_base,
 473    const struct tgsi_token *tokens)
 474 {
 475    struct tgsi_parse_context parse;
 476
 477    if (bld_base->emit_prologue) {
 478       bld_base->emit_prologue(bld_base);
 479    }
 480
 481    if (!lp_bld_tgsi_list_init(bld_base)) {
 482       return FALSE;
 483    }
 484
 485    tgsi_parse_init( &parse, tokens );
 486
 487    while( !tgsi_parse_end_of_tokens( &parse ) ) {
 488       tgsi_parse_token( &parse );
 489
 490       switch( parse.FullToken.Token.Type ) {
 491       case TGSI_TOKEN_TYPE_DECLARATION:
 492          /* Inputs already interpolated */
 493          bld_base->emit_declaration(bld_base, &parse.FullToken.FullDeclaration);
 494          break;
 495
 496       case TGSI_TOKEN_TYPE_INSTRUCTION:
 497          lp_bld_tgsi_add_instruction(bld_base, &parse.FullToken.FullInstruction);
 498          break;
 499
 500       case TGSI_TOKEN_TYPE_IMMEDIATE:
 501          bld_base->emit_immediate(bld_base, &parse.FullToken.FullImmediate);
 502          break;
 503
 504       case TGSI_TOKEN_TYPE_PROPERTY:
 505          break;
 506
 507       default:
 508          assert( 0 );
 509       }
 510    }
 511
 512    while (bld_base->pc != -1) {
 513       const struct tgsi_full_instruction *instr =
 514          bld_base->instructions + bld_base->pc;
 515       const struct tgsi_opcode_info *opcode_info =
 516          tgsi_get_opcode_info(instr->Instruction.Opcode);
 517       if (!lp_build_tgsi_inst_llvm(bld_base, instr)) {
 518          _debug_printf("warning: failed to translate tgsi opcode %s to LLVM\n",
 519                        opcode_info->mnemonic);
 520          return FALSE;
 521       }
 522    }
 523
 524    tgsi_parse_free(&parse);
 525
 526    FREE(bld_base->instructions);
 527
 528    if (bld_base->emit_epilogue) {
 529       bld_base->emit_epilogue(bld_base);
 530    }
 531
 532    return TRUE;
 533 }