src/gallium/auxiliary/gallivm/lp_bld_tgsi_info.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2010 VMware, Inc.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  18  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  19  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  20  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * The above copyright notice and this permission notice (including the
  23  * next paragraph) shall be included in all copies or substantial portions
  24  * of the Software.
  25  *
  26  **************************************************************************/
  27
  28
  29 #include "util/u_memory.h"
  30 #include "util/u_math.h"
  31 #include "tgsi/tgsi_parse.h"
  32 #include "tgsi/tgsi_util.h"
  33 #include "tgsi/tgsi_dump.h"
  34 #include "tgsi/tgsi_strings.h"
  35 #include "lp_bld_debug.h"
  36 #include "lp_bld_tgsi.h"
  37
  38
  39 /**
  40  * Analysis context.
  41  *
  42  * This is where we keep store the value of each channel of the IMM/TEMP/OUT
  43  * register values, as we walk the shader.
  44  */
  45 struct analysis_context
  46 {
  47    struct lp_tgsi_info *info;
  48
  49    unsigned num_imms;
  50    float imm[LP_MAX_TGSI_IMMEDIATES][4];
  51    unsigned sample_target[PIPE_MAX_SHADER_SAMPLER_VIEWS];
  52
  53    struct lp_tgsi_channel_info temp[32][4];
  54 };
  55
  56
  57 /**
  58  * Describe the specified channel of the src register.
  59  */
  60 static void
  61 analyse_src(struct analysis_context *ctx,
  62             struct lp_tgsi_channel_info *chan_info,
  63             const struct tgsi_src_register *src,
  64             unsigned chan)
  65 {
  66    chan_info->file = TGSI_FILE_NULL;
  67    if (!src->Indirect && !src->Absolute && !src->Negate) {
  68       unsigned swizzle = tgsi_util_get_src_register_swizzle(src, chan);
  69       if (src->File == TGSI_FILE_TEMPORARY) {
  70          if (src->Index < Elements(ctx->temp)) {
  71             *chan_info = ctx->temp[src->Index][swizzle];
  72          }
  73       } else {
  74          chan_info->file = src->File;
  75          if (src->File == TGSI_FILE_IMMEDIATE) {
  76             assert(src->Index < Elements(ctx->imm));
  77             if (src->Index < Elements(ctx->imm)) {
  78                chan_info->u.value = ctx->imm[src->Index][swizzle];
  79             }
  80          } else {
  81             chan_info->u.index = src->Index;
  82             chan_info->swizzle = swizzle;
  83          }
  84       }
  85    }
  86 }
  87
  88
  89 /**
  90  * Whether this register channel refers to a specific immediate value.
  91  */
  92 static boolean
  93 is_immediate(const struct lp_tgsi_channel_info *chan_info, float value)
  94 {
  95    return chan_info->file == TGSI_FILE_IMMEDIATE &&
  96           chan_info->u.value == value;
  97 }
  98
  99
 100 /**
 101  * Analyse properties of tex instructions, in particular used
 102  * to figure out if a texture is considered indirect.
 103  * Not actually used by much except the tgsi dumping code.
 104  */
 105 static void
 106 analyse_tex(struct analysis_context *ctx,
 107             const struct tgsi_full_instruction *inst,
 108             enum lp_build_tex_modifier modifier)
 109 {
 110    struct lp_tgsi_info *info = ctx->info;
 111    unsigned chan;
 112
 113    if (info->num_texs < Elements(info->tex)) {
 114       struct lp_tgsi_texture_info *tex_info = &info->tex[info->num_texs];
 115       boolean indirect = FALSE;
 116       unsigned readmask = 0;
 117
 118       tex_info->target = inst->Texture.Texture;
 119       switch (inst->Texture.Texture) {
 120       case TGSI_TEXTURE_1D:
 121          readmask = TGSI_WRITEMASK_X;
 122          break;
 123       case TGSI_TEXTURE_1D_ARRAY:
 124       case TGSI_TEXTURE_2D:
 125       case TGSI_TEXTURE_RECT:
 126          readmask = TGSI_WRITEMASK_XY;
 127          break;
 128       case TGSI_TEXTURE_SHADOW1D:
 129       case TGSI_TEXTURE_SHADOW1D_ARRAY:
 130       case TGSI_TEXTURE_SHADOW2D:
 131       case TGSI_TEXTURE_SHADOWRECT:
 132       case TGSI_TEXTURE_2D_ARRAY:
 133       case TGSI_TEXTURE_2D_MSAA:
 134       case TGSI_TEXTURE_3D:
 135       case TGSI_TEXTURE_CUBE:
 136          readmask = TGSI_WRITEMASK_XYZ;
 137          break;
 138       case TGSI_TEXTURE_SHADOW2D_ARRAY:
 139       case TGSI_TEXTURE_SHADOWCUBE:
 140       case TGSI_TEXTURE_2D_ARRAY_MSAA:
 141       case TGSI_TEXTURE_CUBE_ARRAY:
 142          readmask = TGSI_WRITEMASK_XYZW;
 143          /* modifier would be in another not analyzed reg so just say indirect */
 144          if (modifier != LP_BLD_TEX_MODIFIER_NONE) {
 145             indirect = TRUE;
 146          }
 147          break;
 148       case TGSI_TEXTURE_SHADOWCUBE_ARRAY:
 149          readmask = TGSI_WRITEMASK_XYZW;
 150          indirect = TRUE;
 151          break;
 152       default:
 153          assert(0);
 154          return;
 155       }
 156
 157       if (modifier == LP_BLD_TEX_MODIFIER_EXPLICIT_DERIV) {
 158          /* We don't track explicit derivatives, although we could */
 159          indirect = TRUE;
 160          tex_info->sampler_unit = inst->Src[3].Register.Index;
 161          tex_info->texture_unit = inst->Src[3].Register.Index;
 162       }  else {
 163          if (modifier == LP_BLD_TEX_MODIFIER_PROJECTED ||
 164              modifier == LP_BLD_TEX_MODIFIER_LOD_BIAS ||
 165              modifier == LP_BLD_TEX_MODIFIER_EXPLICIT_LOD) {
 166             readmask |= TGSI_WRITEMASK_W;
 167          }
 168          tex_info->sampler_unit = inst->Src[1].Register.Index;
 169          tex_info->texture_unit = inst->Src[1].Register.Index;
 170       }
 171
 172       for (chan = 0; chan < 4; ++chan) {
 173          struct lp_tgsi_channel_info *chan_info = &tex_info->coord[chan];
 174          if (readmask & (1 << chan)) {
 175             analyse_src(ctx, chan_info, &inst->Src[0].Register, chan);
 176             if (chan_info->file != TGSI_FILE_INPUT) {
 177                indirect = TRUE;
 178             }
 179          } else {
 180             memset(chan_info, 0, sizeof *chan_info);
 181          }
 182       }
 183
 184       if (indirect) {
 185          info->indirect_textures = TRUE;
 186       }
 187
 188       ++info->num_texs;
 189    } else {
 190       info->indirect_textures = TRUE;
 191    }
 192 }
 193
 194
 195 /**
 196  * Analyse properties of sample instructions, in particular used
 197  * to figure out if a texture is considered indirect.
 198  * Not actually used by much except the tgsi dumping code.
 199  */
 200 static void
 201 analyse_sample(struct analysis_context *ctx,
 202                const struct tgsi_full_instruction *inst,
 203                enum lp_build_tex_modifier modifier,
 204                boolean shadow)
 205 {
 206    struct lp_tgsi_info *info = ctx->info;
 207    unsigned chan;
 208
 209    if (info->num_texs < Elements(info->tex)) {
 210       struct lp_tgsi_texture_info *tex_info = &info->tex[info->num_texs];
 211       unsigned target = ctx->sample_target[inst->Src[1].Register.Index];
 212       boolean indirect = FALSE;
 213       boolean shadow = FALSE;
 214       unsigned readmask;
 215
 216       switch (target) {
 217       /* note no shadow targets here */
 218       case TGSI_TEXTURE_BUFFER:
 219       case TGSI_TEXTURE_1D:
 220          readmask = TGSI_WRITEMASK_X;
 221          break;
 222       case TGSI_TEXTURE_1D_ARRAY:
 223       case TGSI_TEXTURE_2D:
 224       case TGSI_TEXTURE_RECT:
 225          readmask = TGSI_WRITEMASK_XY;
 226          break;
 227       case TGSI_TEXTURE_2D_ARRAY:
 228       case TGSI_TEXTURE_2D_MSAA:
 229       case TGSI_TEXTURE_3D:
 230       case TGSI_TEXTURE_CUBE:
 231          readmask = TGSI_WRITEMASK_XYZ;
 232          break;
 233       case TGSI_TEXTURE_CUBE_ARRAY:
 234       case TGSI_TEXTURE_2D_ARRAY_MSAA:
 235          readmask = TGSI_WRITEMASK_XYZW;
 236          break;
 237       default:
 238          assert(0);
 239          return;
 240       }
 241
 242       tex_info->target = target;
 243       tex_info->texture_unit = inst->Src[1].Register.Index;
 244       tex_info->sampler_unit = inst->Src[2].Register.Index;
 245
 246       if (tex_info->texture_unit != tex_info->sampler_unit) {
 247          info->sampler_texture_units_different = TRUE;
 248       }
 249
 250       if (modifier == LP_BLD_TEX_MODIFIER_EXPLICIT_DERIV ||
 251           modifier == LP_BLD_TEX_MODIFIER_EXPLICIT_LOD ||
 252           modifier == LP_BLD_TEX_MODIFIER_LOD_BIAS || shadow) {
 253          /* We don't track insts with additional regs, although we could */
 254          indirect = TRUE;
 255       }
 256
 257       for (chan = 0; chan < 4; ++chan) {
 258          struct lp_tgsi_channel_info *chan_info = &tex_info->coord[chan];
 259          if (readmask & (1 << chan)) {
 260             analyse_src(ctx, chan_info, &inst->Src[0].Register, chan);
 261             if (chan_info->file != TGSI_FILE_INPUT) {
 262                indirect = TRUE;
 263             }
 264          } else {
 265             memset(chan_info, 0, sizeof *chan_info);
 266          }
 267       }
 268
 269       if (indirect) {
 270          info->indirect_textures = TRUE;
 271       }
 272
 273       ++info->num_texs;
 274    } else {
 275       info->indirect_textures = TRUE;
 276    }
 277 }
 278
 279
 280 /**
 281  * Process an instruction, and update the register values accordingly.
 282  */
 283 static void
 284 analyse_instruction(struct analysis_context *ctx,
 285                     struct tgsi_full_instruction *inst)
 286 {
 287    struct lp_tgsi_info *info = ctx->info;
 288    struct lp_tgsi_channel_info (*regs)[4];
 289    unsigned max_regs;
 290    unsigned i;
 291    unsigned index;
 292    unsigned chan;
 293
 294    for (i = 0; i < inst->Instruction.NumDstRegs; ++i) {
 295       const struct tgsi_dst_register *dst = &inst->Dst[i].Register;
 296
 297       /*
 298        * Get the lp_tgsi_channel_info array corresponding to the destination
 299        * register file.
 300        */
 301
 302       if (dst->File == TGSI_FILE_TEMPORARY) {
 303          regs = ctx->temp;
 304          max_regs = Elements(ctx->temp);
 305       } else if (dst->File == TGSI_FILE_OUTPUT) {
 306          regs = info->output;
 307          max_regs = Elements(info->output);
 308       } else if (dst->File == TGSI_FILE_ADDRESS ||
 309                  dst->File == TGSI_FILE_PREDICATE) {
 310          continue;
 311       } else {
 312          assert(0);
 313          continue;
 314       }
 315
 316       /*
 317        * Detect direct TEX instructions
 318        */
 319
 320       switch (inst->Instruction.Opcode) {
 321       case TGSI_OPCODE_TEX:
 322          analyse_tex(ctx, inst, LP_BLD_TEX_MODIFIER_NONE);
 323          break;
 324       case TGSI_OPCODE_TXD:
 325          analyse_tex(ctx, inst, LP_BLD_TEX_MODIFIER_EXPLICIT_DERIV);
 326          break;
 327       case TGSI_OPCODE_TXB:
 328          analyse_tex(ctx, inst, LP_BLD_TEX_MODIFIER_LOD_BIAS);
 329          break;
 330       case TGSI_OPCODE_TXL:
 331          analyse_tex(ctx, inst, LP_BLD_TEX_MODIFIER_EXPLICIT_LOD);
 332          break;
 333       case TGSI_OPCODE_TXP:
 334          analyse_tex(ctx, inst, LP_BLD_TEX_MODIFIER_PROJECTED);
 335          break;
 336       case TGSI_OPCODE_TEX2:
 337          analyse_tex(ctx, inst, LP_BLD_TEX_MODIFIER_NONE);
 338          break;
 339       case TGSI_OPCODE_TXB2:
 340          analyse_tex(ctx, inst, LP_BLD_TEX_MODIFIER_LOD_BIAS);
 341          break;
 342       case TGSI_OPCODE_TXL2:
 343          analyse_tex(ctx, inst, LP_BLD_TEX_MODIFIER_EXPLICIT_LOD);
 344          break;
 345       case TGSI_OPCODE_SAMPLE:
 346          analyse_sample(ctx, inst, LP_BLD_TEX_MODIFIER_NONE, FALSE);
 347          break;
 348       case TGSI_OPCODE_SAMPLE_C:
 349          analyse_sample(ctx, inst, LP_BLD_TEX_MODIFIER_NONE, TRUE);
 350          break;
 351       case TGSI_OPCODE_SAMPLE_C_LZ:
 352          analyse_sample(ctx, inst, LP_BLD_TEX_MODIFIER_LOD_ZERO, TRUE);
 353          break;
 354       case TGSI_OPCODE_SAMPLE_D:
 355          analyse_sample(ctx, inst, LP_BLD_TEX_MODIFIER_EXPLICIT_DERIV, FALSE);
 356          break;
 357       case TGSI_OPCODE_SAMPLE_B:
 358          analyse_sample(ctx, inst, LP_BLD_TEX_MODIFIER_LOD_BIAS, FALSE);
 359          break;
 360       case TGSI_OPCODE_SAMPLE_L:
 361          analyse_sample(ctx, inst, LP_BLD_TEX_MODIFIER_EXPLICIT_LOD, FALSE);
 362          break;
 363       default:
 364          break;
 365       }
 366
 367       /*
 368        * Keep track of assignments and writes
 369        */
 370
 371       if (dst->Indirect) {
 372          /*
 373           * It could be any register index so clear all register indices.
 374           */
 375
 376          for (chan = 0; chan < 4; ++chan) {
 377             if (dst->WriteMask & (1 << chan)) {
 378                for (index = 0; index < max_regs; ++index) {
 379                   regs[index][chan].file = TGSI_FILE_NULL;
 380                }
 381             }
 382          }
 383       } else if (dst->Index < max_regs) {
 384          /*
 385           * Update this destination register value.
 386           */
 387
 388          struct lp_tgsi_channel_info res[4];
 389
 390          memset(res, 0, sizeof res);
 391
 392          if (!inst->Instruction.Predicate &&
 393              !inst->Instruction.Saturate) {
 394             for (chan = 0; chan < 4; ++chan) {
 395                if (dst->WriteMask & (1 << chan)) {
 396                   if (inst->Instruction.Opcode == TGSI_OPCODE_MOV) {
 397                      analyse_src(ctx, &res[chan],
 398                                  &inst->Src[0].Register, chan);
 399                   } else if (inst->Instruction.Opcode == TGSI_OPCODE_MUL) {
 400                      /*
 401                       * Propagate values across 1.0 and 0.0 multiplications.
 402                       */
 403
 404                      struct lp_tgsi_channel_info src0;
 405                      struct lp_tgsi_channel_info src1;
 406
 407                      analyse_src(ctx, &src0, &inst->Src[0].Register, chan);
 408                      analyse_src(ctx, &src1, &inst->Src[1].Register, chan);
 409
 410                      if (is_immediate(&src0, 0.0f)) {
 411                         res[chan] = src0;
 412                      } else if (is_immediate(&src1, 0.0f)) {
 413                         res[chan] = src1;
 414                      } else if (is_immediate(&src0, 1.0f)) {
 415                         res[chan] = src1;
 416                      } else if (is_immediate(&src1, 1.0f)) {
 417                         res[chan] = src0;
 418                      }
 419                   }
 420                }
 421             }
 422          }
 423
 424          for (chan = 0; chan < 4; ++chan) {
 425             if (dst->WriteMask & (1 << chan)) {
 426                regs[dst->Index][chan] = res[chan];
 427             }
 428          }
 429       }
 430    }
 431
 432    /*
 433     * Clear all temporaries information in presence of a control flow opcode.
 434     */
 435
 436    switch (inst->Instruction.Opcode) {
 437    case TGSI_OPCODE_IF:
 438    case TGSI_OPCODE_UIF:
 439    case TGSI_OPCODE_ELSE:
 440    case TGSI_OPCODE_ENDIF:
 441    case TGSI_OPCODE_BGNLOOP:
 442    case TGSI_OPCODE_BRK:
 443    case TGSI_OPCODE_BREAKC:
 444    case TGSI_OPCODE_CONT:
 445    case TGSI_OPCODE_ENDLOOP:
 446    case TGSI_OPCODE_CALLNZ:
 447    case TGSI_OPCODE_CAL:
 448    case TGSI_OPCODE_BGNSUB:
 449    case TGSI_OPCODE_ENDSUB:
 450    case TGSI_OPCODE_SWITCH:
 451    case TGSI_OPCODE_CASE:
 452    case TGSI_OPCODE_DEFAULT:
 453    case TGSI_OPCODE_ENDSWITCH:
 454    case TGSI_OPCODE_RET:
 455    case TGSI_OPCODE_END:
 456       /* XXX: Are there more cases? */
 457       memset(&ctx->temp, 0, sizeof ctx->temp);
 458       memset(&info->output, 0, sizeof info->output);
 459    default:
 460       break;
 461    }
 462 }
 463
 464
 465 static inline void
 466 dump_info(const struct tgsi_token *tokens,
 467           struct lp_tgsi_info *info)
 468 {
 469    unsigned index;
 470    unsigned chan;
 471
 472    tgsi_dump(tokens, 0);
 473
 474    for (index = 0; index < info->num_texs; ++index) {
 475       const struct lp_tgsi_texture_info *tex_info = &info->tex[index];
 476       debug_printf("TEX[%u] =", index);
 477       for (chan = 0; chan < 4; ++chan) {
 478          const struct lp_tgsi_channel_info *chan_info =
 479                &tex_info->coord[chan];
 480          if (chan_info->file != TGSI_FILE_NULL) {
 481             debug_printf(" %s[%u].%c",
 482                          tgsi_file_name(chan_info->file),
 483                          chan_info->u.index,
 484                          "xyzw01"[chan_info->swizzle]);
 485          } else {
 486             debug_printf(" _");
 487          }
 488       }
 489       debug_printf(", RES[%u], SAMP[%u], %s\n",
 490                    tex_info->texture_unit,
 491                    tex_info->sampler_unit,
 492                    tgsi_texture_names[tex_info->target]);
 493    }
 494
 495    for (index = 0; index < PIPE_MAX_SHADER_OUTPUTS; ++index) {
 496       for (chan = 0; chan < 4; ++chan) {
 497          const struct lp_tgsi_channel_info *chan_info =
 498                &info->output[index][chan];
 499          if (chan_info->file != TGSI_FILE_NULL) {
 500             debug_printf("OUT[%u].%c = ", index, "xyzw"[chan]);
 501             if (chan_info->file == TGSI_FILE_IMMEDIATE) {
 502                debug_printf("%f", chan_info->u.value);
 503             } else {
 504                const char *file_name;
 505                switch (chan_info->file) {
 506                case TGSI_FILE_CONSTANT:
 507                   file_name = "CONST";
 508                   break;
 509                case TGSI_FILE_INPUT:
 510                   file_name = "IN";
 511                   break;
 512                default:
 513                   file_name = "???";
 514                   break;
 515                }
 516                debug_printf("%s[%u].%c",
 517                             file_name,
 518                             chan_info->u.index,
 519                             "xyzw01"[chan_info->swizzle]);
 520             }
 521             debug_printf("\n");
 522          }
 523       }
 524    }
 525 }
 526
 527
 528 /**
 529  * Detect any direct relationship between the output color
 530  */
 531 void
 532 lp_build_tgsi_info(const struct tgsi_token *tokens,
 533                    struct lp_tgsi_info *info)
 534 {
 535    struct tgsi_parse_context parse;
 536    struct analysis_context *ctx;
 537    unsigned index;
 538    unsigned chan;
 539
 540    memset(info, 0, sizeof *info);
 541
 542    tgsi_scan_shader(tokens, &info->base);
 543
 544    ctx = CALLOC(1, sizeof(struct analysis_context));
 545    ctx->info = info;
 546
 547    tgsi_parse_init(&parse, tokens);
 548
 549    while (!tgsi_parse_end_of_tokens(&parse)) {
 550       tgsi_parse_token(&parse);
 551
 552       switch (parse.FullToken.Token.Type) {
 553       case TGSI_TOKEN_TYPE_DECLARATION: {
 554          struct tgsi_full_declaration *decl = &parse.FullToken.FullDeclaration;
 555          if (decl->Declaration.File == TGSI_FILE_SAMPLER_VIEW) {
 556             for (index = decl->Range.First; index <= decl->Range.Last; index++) {
 557                ctx->sample_target[index] = decl->SamplerView.Resource;
 558             }
 559          }
 560       }
 561          break;
 562
 563       case TGSI_TOKEN_TYPE_INSTRUCTION:
 564          {
 565             struct tgsi_full_instruction *inst =
 566                   &parse.FullToken.FullInstruction;
 567
 568             if (inst->Instruction.Opcode == TGSI_OPCODE_END ||
 569                 inst->Instruction.Opcode == TGSI_OPCODE_BGNSUB) {
 570                /* We reached the end of main function body. */
 571                goto finished;
 572             }
 573
 574             analyse_instruction(ctx, inst);
 575          }
 576          break;
 577
 578       case TGSI_TOKEN_TYPE_IMMEDIATE:
 579          {
 580             const unsigned size =
 581                   parse.FullToken.FullImmediate.Immediate.NrTokens - 1;
 582             assert(size <= 4);
 583             if (ctx->num_imms < Elements(ctx->imm)) {
 584                for (chan = 0; chan < size; ++chan) {
 585                   float value = parse.FullToken.FullImmediate.u[chan].Float;
 586                   ctx->imm[ctx->num_imms][chan] = value;
 587
 588                   if (value < 0.0f || value > 1.0f) {
 589                      info->unclamped_immediates = TRUE;
 590                   }
 591                }
 592                ++ctx->num_imms;
 593             }
 594          }
 595          break;
 596
 597       case TGSI_TOKEN_TYPE_PROPERTY:
 598          break;
 599
 600       default:
 601          assert(0);
 602       }
 603    }
 604 finished:
 605
 606    tgsi_parse_free(&parse);
 607    FREE(ctx);
 608
 609
 610    /*
 611     * Link the output color values.
 612     */
 613
 614    for (index = 0; index < PIPE_MAX_COLOR_BUFS; ++index) {
 615       const struct lp_tgsi_channel_info null_output[4];
 616       info->cbuf[index] = null_output;
 617    }
 618
 619    for (index = 0; index < info->base.num_outputs; ++index) {
 620       unsigned semantic_name = info->base.output_semantic_name[index];
 621       unsigned semantic_index = info->base.output_semantic_index[index];
 622       if (semantic_name == TGSI_SEMANTIC_COLOR &&
 623           semantic_index < PIPE_MAX_COLOR_BUFS) {
 624          info->cbuf[semantic_index] = info->output[index];
 625       }
 626    }
 627
 628    if (gallivm_debug & GALLIVM_DEBUG_TGSI) {
 629       dump_info(tokens, info);
 630    }
 631 }