src/mesa/drivers/dri/r300/compiler/radeon_compiler.c

   1 /*
   2  * Copyright 2009 Nicolai Hähnle <nhaehnle@gmail.com>
   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  * on the rights to use, copy, modify, merge, publish, distribute, sub
   8  * license, and/or sell copies of the Software, and to permit persons to whom
   9  * the 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 NON-INFRINGEMENT. IN NO EVENT SHALL
  18  * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  21  * USE OR OTHER DEALINGS IN THE SOFTWARE. */
  22
  23 #include "radeon_compiler.h"
  24
  25 #include <stdarg.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28
  29 #include "radeon_dataflow.h"
  30 #include "radeon_program.h"
  31 #include "radeon_program_pair.h"
  32 #include "radeon_compiler_util.h"
  33
  34
  35 void rc_init(struct radeon_compiler * c)
  36 {
  37         memset(c, 0, sizeof(*c));
  38
  39         memory_pool_init(&c->Pool);
  40         c->Program.Instructions.Prev = &c->Program.Instructions;
  41         c->Program.Instructions.Next = &c->Program.Instructions;
  42         c->Program.Instructions.U.I.Opcode = RC_OPCODE_ILLEGAL_OPCODE;
  43 }
  44
  45 void rc_destroy(struct radeon_compiler * c)
  46 {
  47         rc_constants_destroy(&c->Program.Constants);
  48         memory_pool_destroy(&c->Pool);
  49         free(c->ErrorMsg);
  50 }
  51
  52 void rc_debug(struct radeon_compiler * c, const char * fmt, ...)
  53 {
  54         va_list ap;
  55
  56         if (!(c->Debug & RC_DBG_LOG))
  57                 return;
  58
  59         va_start(ap, fmt);
  60         vfprintf(stderr, fmt, ap);
  61         va_end(ap);
  62 }
  63
  64 void rc_error(struct radeon_compiler * c, const char * fmt, ...)
  65 {
  66         va_list ap;
  67
  68         c->Error = 1;
  69
  70         if (!c->ErrorMsg) {
  71                 /* Only remember the first error */
  72                 char buf[1024];
  73                 int written;
  74
  75                 va_start(ap, fmt);
  76                 written = vsnprintf(buf, sizeof(buf), fmt, ap);
  77                 va_end(ap);
  78
  79                 if (written < sizeof(buf)) {
  80                         c->ErrorMsg = strdup(buf);
  81                 } else {
  82                         c->ErrorMsg = malloc(written + 1);
  83
  84                         va_start(ap, fmt);
  85                         vsnprintf(c->ErrorMsg, written + 1, fmt, ap);
  86                         va_end(ap);
  87                 }
  88         }
  89
  90         if (c->Debug & RC_DBG_LOG) {
  91                 fprintf(stderr, "r300compiler error: ");
  92
  93                 va_start(ap, fmt);
  94                 vfprintf(stderr, fmt, ap);
  95                 va_end(ap);
  96         }
  97 }
  98
  99 int rc_if_fail_helper(struct radeon_compiler * c, const char * file, int line, const char * assertion)
 100 {
 101         rc_error(c, "ICE at %s:%i: assertion failed: %s\n", file, line, assertion);
 102         return 1;
 103 }
 104
 105 /**
 106  * Recompute c->Program.InputsRead and c->Program.OutputsWritten
 107  * based on which inputs and outputs are actually referenced
 108  * in program instructions.
 109  */
 110 void rc_calculate_inputs_outputs(struct radeon_compiler * c)
 111 {
 112         struct rc_instruction *inst;
 113
 114         c->Program.InputsRead = 0;
 115         c->Program.OutputsWritten = 0;
 116
 117         for(inst = c->Program.Instructions.Next; inst != &c->Program.Instructions; inst = inst->Next)
 118         {
 119                 const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->U.I.Opcode);
 120                 int i;
 121
 122                 for (i = 0; i < opcode->NumSrcRegs; ++i) {
 123                         if (inst->U.I.SrcReg[i].File == RC_FILE_INPUT)
 124                                 c->Program.InputsRead |= 1 << inst->U.I.SrcReg[i].Index;
 125                 }
 126
 127                 if (opcode->HasDstReg) {
 128                         if (inst->U.I.DstReg.File == RC_FILE_OUTPUT)
 129                                 c->Program.OutputsWritten |= 1 << inst->U.I.DstReg.Index;
 130                 }
 131         }
 132 }
 133
 134 /**
 135  * Rewrite the program such that everything that source the given input
 136  * register will source new_input instead.
 137  */
 138 void rc_move_input(struct radeon_compiler * c, unsigned input, struct rc_src_register new_input)
 139 {
 140         struct rc_instruction * inst;
 141
 142         c->Program.InputsRead &= ~(1 << input);
 143
 144         for(inst = c->Program.Instructions.Next; inst != &c->Program.Instructions; inst = inst->Next) {
 145                 const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->U.I.Opcode);
 146                 unsigned i;
 147
 148                 for(i = 0; i < opcode->NumSrcRegs; ++i) {
 149                         if (inst->U.I.SrcReg[i].File == RC_FILE_INPUT && inst->U.I.SrcReg[i].Index == input) {
 150                                 inst->U.I.SrcReg[i].File = new_input.File;
 151                                 inst->U.I.SrcReg[i].Index = new_input.Index;
 152                                 inst->U.I.SrcReg[i].Swizzle = combine_swizzles(new_input.Swizzle, inst->U.I.SrcReg[i].Swizzle);
 153                                 if (!inst->U.I.SrcReg[i].Abs) {
 154                                         inst->U.I.SrcReg[i].Negate ^= new_input.Negate;
 155                                         inst->U.I.SrcReg[i].Abs = new_input.Abs;
 156                                 }
 157
 158                                 c->Program.InputsRead |= 1 << new_input.Index;
 159                         }
 160                 }
 161         }
 162 }
 163
 164
 165 /**
 166  * Rewrite the program such that everything that writes into the given
 167  * output register will instead write to new_output. The new_output
 168  * writemask is honoured.
 169  */
 170 void rc_move_output(struct radeon_compiler * c, unsigned output, unsigned new_output, unsigned writemask)
 171 {
 172         struct rc_instruction * inst;
 173
 174         c->Program.OutputsWritten &= ~(1 << output);
 175
 176         for(inst = c->Program.Instructions.Next; inst != &c->Program.Instructions; inst = inst->Next) {
 177                 const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->U.I.Opcode);
 178
 179                 if (opcode->HasDstReg) {
 180                         if (inst->U.I.DstReg.File == RC_FILE_OUTPUT && inst->U.I.DstReg.Index == output) {
 181                                 inst->U.I.DstReg.Index = new_output;
 182                                 inst->U.I.DstReg.WriteMask &= writemask;
 183
 184                                 c->Program.OutputsWritten |= 1 << new_output;
 185                         }
 186                 }
 187         }
 188 }
 189
 190
 191 /**
 192  * Rewrite the program such that a given output is duplicated.
 193  */
 194 void rc_copy_output(struct radeon_compiler * c, unsigned output, unsigned dup_output)
 195 {
 196         unsigned tempreg = rc_find_free_temporary(c);
 197         struct rc_instruction * inst;
 198
 199         for(inst = c->Program.Instructions.Next; inst != &c->Program.Instructions; inst = inst->Next) {
 200                 const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->U.I.Opcode);
 201
 202                 if (opcode->HasDstReg) {
 203                         if (inst->U.I.DstReg.File == RC_FILE_OUTPUT && inst->U.I.DstReg.Index == output) {
 204                                 inst->U.I.DstReg.File = RC_FILE_TEMPORARY;
 205                                 inst->U.I.DstReg.Index = tempreg;
 206                         }
 207                 }
 208         }
 209
 210         inst = rc_insert_new_instruction(c, c->Program.Instructions.Prev);
 211         inst->U.I.Opcode = RC_OPCODE_MOV;
 212         inst->U.I.DstReg.File = RC_FILE_OUTPUT;
 213         inst->U.I.DstReg.Index = output;
 214
 215         inst->U.I.SrcReg[0].File = RC_FILE_TEMPORARY;
 216         inst->U.I.SrcReg[0].Index = tempreg;
 217         inst->U.I.SrcReg[0].Swizzle = RC_SWIZZLE_XYZW;
 218
 219         inst = rc_insert_new_instruction(c, c->Program.Instructions.Prev);
 220         inst->U.I.Opcode = RC_OPCODE_MOV;
 221         inst->U.I.DstReg.File = RC_FILE_OUTPUT;
 222         inst->U.I.DstReg.Index = dup_output;
 223
 224         inst->U.I.SrcReg[0].File = RC_FILE_TEMPORARY;
 225         inst->U.I.SrcReg[0].Index = tempreg;
 226         inst->U.I.SrcReg[0].Swizzle = RC_SWIZZLE_XYZW;
 227
 228         c->Program.OutputsWritten |= 1 << dup_output;
 229 }
 230
 231
 232 /**
 233  * Introduce standard code fragment to deal with fragment.position.
 234  */
 235 void rc_transform_fragment_wpos(struct radeon_compiler * c, unsigned wpos, unsigned new_input,
 236                                 int full_vtransform)
 237 {
 238         unsigned tempregi = rc_find_free_temporary(c);
 239         struct rc_instruction * inst_rcp;
 240         struct rc_instruction * inst_mul;
 241         struct rc_instruction * inst_mad;
 242         struct rc_instruction * inst;
 243
 244         c->Program.InputsRead &= ~(1 << wpos);
 245         c->Program.InputsRead |= 1 << new_input;
 246
 247         /* perspective divide */
 248         inst_rcp = rc_insert_new_instruction(c, &c->Program.Instructions);
 249         inst_rcp->U.I.Opcode = RC_OPCODE_RCP;
 250
 251         inst_rcp->U.I.DstReg.File = RC_FILE_TEMPORARY;
 252         inst_rcp->U.I.DstReg.Index = tempregi;
 253         inst_rcp->U.I.DstReg.WriteMask = RC_MASK_W;
 254
 255         inst_rcp->U.I.SrcReg[0].File = RC_FILE_INPUT;
 256         inst_rcp->U.I.SrcReg[0].Index = new_input;
 257         inst_rcp->U.I.SrcReg[0].Swizzle = RC_SWIZZLE_WWWW;
 258
 259         inst_mul = rc_insert_new_instruction(c, inst_rcp);
 260         inst_mul->U.I.Opcode = RC_OPCODE_MUL;
 261
 262         inst_mul->U.I.DstReg.File = RC_FILE_TEMPORARY;
 263         inst_mul->U.I.DstReg.Index = tempregi;
 264         inst_mul->U.I.DstReg.WriteMask = RC_MASK_XYZ;
 265
 266         inst_mul->U.I.SrcReg[0].File = RC_FILE_INPUT;
 267         inst_mul->U.I.SrcReg[0].Index = new_input;
 268
 269         inst_mul->U.I.SrcReg[1].File = RC_FILE_TEMPORARY;
 270         inst_mul->U.I.SrcReg[1].Index = tempregi;
 271         inst_mul->U.I.SrcReg[1].Swizzle = RC_SWIZZLE_WWWW;
 272
 273         /* viewport transformation */
 274         inst_mad = rc_insert_new_instruction(c, inst_mul);
 275         inst_mad->U.I.Opcode = RC_OPCODE_MAD;
 276
 277         inst_mad->U.I.DstReg.File = RC_FILE_TEMPORARY;
 278         inst_mad->U.I.DstReg.Index = tempregi;
 279         inst_mad->U.I.DstReg.WriteMask = RC_MASK_XYZ;
 280
 281         inst_mad->U.I.SrcReg[0].File = RC_FILE_TEMPORARY;
 282         inst_mad->U.I.SrcReg[0].Index = tempregi;
 283         inst_mad->U.I.SrcReg[0].Swizzle = RC_SWIZZLE_XYZ0;
 284
 285         inst_mad->U.I.SrcReg[1].File = RC_FILE_CONSTANT;
 286         inst_mad->U.I.SrcReg[1].Swizzle = RC_SWIZZLE_XYZ0;
 287
 288         inst_mad->U.I.SrcReg[2].File = RC_FILE_CONSTANT;
 289         inst_mad->U.I.SrcReg[2].Swizzle = RC_SWIZZLE_XYZ0;
 290
 291         if (full_vtransform) {
 292                 inst_mad->U.I.SrcReg[1].Index = rc_constants_add_state(&c->Program.Constants, RC_STATE_R300_VIEWPORT_SCALE, 0);
 293                 inst_mad->U.I.SrcReg[2].Index = rc_constants_add_state(&c->Program.Constants, RC_STATE_R300_VIEWPORT_OFFSET, 0);
 294         } else {
 295                 inst_mad->U.I.SrcReg[1].Index =
 296                 inst_mad->U.I.SrcReg[2].Index = rc_constants_add_state(&c->Program.Constants, RC_STATE_R300_WINDOW_DIMENSION, 0);
 297         }
 298
 299         for (inst = inst_mad->Next; inst != &c->Program.Instructions; inst = inst->Next) {
 300                 const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->U.I.Opcode);
 301                 unsigned i;
 302
 303                 for(i = 0; i < opcode->NumSrcRegs; i++) {
 304                         if (inst->U.I.SrcReg[i].File == RC_FILE_INPUT &&
 305                             inst->U.I.SrcReg[i].Index == wpos) {
 306                                 inst->U.I.SrcReg[i].File = RC_FILE_TEMPORARY;
 307                                 inst->U.I.SrcReg[i].Index = tempregi;
 308                         }
 309                 }
 310         }
 311 }
 312
 313
 314 /**
 315  * The FACE input in hardware contains 1 if it's a back face, 0 otherwise.
 316  * Gallium and OpenGL define it the other way around.
 317  *
 318  * So let's just negate FACE at the beginning of the shader and rewrite the rest
 319  * of the shader to read from the newly allocated temporary.
 320  */
 321 void rc_transform_fragment_face(struct radeon_compiler *c, unsigned face)
 322 {
 323         unsigned tempregi = rc_find_free_temporary(c);
 324         struct rc_instruction *inst_add;
 325         struct rc_instruction *inst;
 326
 327         /* perspective divide */
 328         inst_add = rc_insert_new_instruction(c, &c->Program.Instructions);
 329         inst_add->U.I.Opcode = RC_OPCODE_ADD;
 330
 331         inst_add->U.I.DstReg.File = RC_FILE_TEMPORARY;
 332         inst_add->U.I.DstReg.Index = tempregi;
 333         inst_add->U.I.DstReg.WriteMask = RC_MASK_X;
 334
 335         inst_add->U.I.SrcReg[0].File = RC_FILE_NONE;
 336         inst_add->U.I.SrcReg[0].Swizzle = RC_SWIZZLE_1111;
 337
 338         inst_add->U.I.SrcReg[1].File = RC_FILE_INPUT;
 339         inst_add->U.I.SrcReg[1].Index = face;
 340         inst_add->U.I.SrcReg[1].Swizzle = RC_SWIZZLE_XXXX;
 341         inst_add->U.I.SrcReg[1].Negate = RC_MASK_XYZW;
 342
 343         for (inst = inst_add->Next; inst != &c->Program.Instructions; inst = inst->Next) {
 344                 const struct rc_opcode_info * opcode = rc_get_opcode_info(inst->U.I.Opcode);
 345                 unsigned i;
 346
 347                 for(i = 0; i < opcode->NumSrcRegs; i++) {
 348                         if (inst->U.I.SrcReg[i].File == RC_FILE_INPUT &&
 349                             inst->U.I.SrcReg[i].Index == face) {
 350                                 inst->U.I.SrcReg[i].File = RC_FILE_TEMPORARY;
 351                                 inst->U.I.SrcReg[i].Index = tempregi;
 352                         }
 353                 }
 354         }
 355 }
 356
 357 static void reg_count_callback(void * userdata, struct rc_instruction * inst,
 358                 rc_register_file file, unsigned int index, unsigned int mask)
 359 {
 360         unsigned int * max_reg = userdata;
 361         if (file == RC_FILE_TEMPORARY)
 362                 index > *max_reg ? *max_reg = index : 0;
 363 }
 364
 365 static void print_stats(struct radeon_compiler * c)
 366 {
 367         struct rc_instruction * tmp;
 368         unsigned max_reg, insts, fc, tex, alpha, rgb, presub;
 369         max_reg = insts = fc = tex = alpha = rgb = presub = 0;
 370         for(tmp = c->Program.Instructions.Next; tmp != &c->Program.Instructions;
 371                                                         tmp = tmp->Next){
 372                 const struct rc_opcode_info * info;
 373                 rc_for_all_reads_mask(tmp, reg_count_callback, &max_reg);
 374                 if (tmp->Type == RC_INSTRUCTION_NORMAL) {
 375                         if (tmp->U.I.PreSub.Opcode != RC_PRESUB_NONE)
 376                                 presub++;
 377                         info = rc_get_opcode_info(tmp->U.I.Opcode);
 378                 } else {
 379                         if (tmp->U.P.RGB.Src[RC_PAIR_PRESUB_SRC].Used)
 380                                 presub++;
 381                         if (tmp->U.P.Alpha.Src[RC_PAIR_PRESUB_SRC].Used)
 382                                 presub++;
 383                         /* Assuming alpha will never be a flow control or
 384                          * a tex instruction. */
 385                         if (tmp->U.P.Alpha.Opcode != RC_OPCODE_NOP)
 386                                 alpha++;
 387                         if (tmp->U.P.RGB.Opcode != RC_OPCODE_NOP)
 388                                 rgb++;
 389                         info = rc_get_opcode_info(tmp->U.P.RGB.Opcode);
 390                 }
 391                 if (info->IsFlowControl)
 392                         fc++;
 393                 if (info->HasTexture)
 394                         tex++;
 395                 insts++;
 396         }
 397         if (insts < 4)
 398                 return;
 399         fprintf(stderr,"~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n"
 400                        "~%4u Instructions\n"
 401                        "~%4u Vector Instructions (RGB)\n"
 402                        "~%4u Scalar Instructions (Alpha)\n"
 403                        "~%4u Flow Control Instructions\n"
 404                        "~%4u Texture Instructions\n"
 405                        "~%4u Presub Operations\n"
 406                        "~%4u Temporary Registers\n"
 407                        "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n",
 408                        insts, rgb, alpha, fc, tex, presub, max_reg + 1);
 409 }
 410
 411 /* Executes a list of compiler passes given in the parameter 'list'. */
 412 void rc_run_compiler(struct radeon_compiler *c, struct radeon_compiler_pass *list,
 413                      const char *shader_name)
 414 {
 415         if (c->Debug & RC_DBG_LOG) {
 416                 fprintf(stderr, "%s: before compilation\n", shader_name);
 417                 rc_print_program(&c->Program);
 418         }
 419
 420         for (unsigned i = 0; list[i].name; i++) {
 421                 if (list[i].predicate) {
 422                         list[i].run(c, list[i].user);
 423
 424                         if (c->Error)
 425                                 return;
 426
 427                         if ((c->Debug & RC_DBG_LOG) && list[i].dump) {
 428                                 fprintf(stderr, "%s: after '%s'\n", shader_name, list[i].name);
 429                                 rc_print_program(&c->Program);
 430                         }
 431                 }
 432         }
 433         if (c->Debug & RC_DBG_STATS)
 434                 print_stats(c);
 435 }
 436
 437 void rc_validate_final_shader(struct radeon_compiler *c, void *user)
 438 {
 439         /* Check the number of constants. */
 440         if (c->Program.Constants.Count > c->max_constants) {
 441                 rc_error(c, "Too many constants. Max: 256, Got: %i\n",
 442                          c->Program.Constants.Count);
 443         }
 444 }