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  1. /*
  2.  * Mesa 3-D graphics library
  3.  *
  4.  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
  5.  * Copyright (C) 1999-2009  VMware, Inc.  All Rights Reserved.
  6.  *
  7.  * Permission is hereby granted, free of charge, to any person obtaining a
  8.  * copy of this software and associated documentation files (the "Software"),
  9.  * to deal in the Software without restriction, including without limitation
  10.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11.  * and/or sell copies of the Software, and to permit persons to whom the
  12.  * Software is furnished to do so, subject to the following conditions:
  13.  *
  14.  * The above copyright notice and this permission notice shall be included
  15.  * in all copies or substantial portions of the Software.
  16.  *
  17.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18.  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  21.  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  22.  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  23.  * OTHER DEALINGS IN THE SOFTWARE.
  24.  */
  25.  
  26.  
  27. #include "main/glheader.h"
  28. #include "main/imports.h"
  29. #include "main/mtypes.h"
  30. #include "prog_instruction.h"
  31.  
  32.  
  33. /**
  34.  * Initialize program instruction fields to defaults.
  35.  * \param inst  first instruction to initialize
  36.  * \param count  number of instructions to initialize
  37.  */
  38. void
  39. _mesa_init_instructions(struct prog_instruction *inst, GLuint count)
  40. {
  41.    GLuint i;
  42.  
  43.    memset(inst, 0, count * sizeof(struct prog_instruction));
  44.  
  45.    for (i = 0; i < count; i++) {
  46.       inst[i].SrcReg[0].File = PROGRAM_UNDEFINED;
  47.       inst[i].SrcReg[0].Swizzle = SWIZZLE_NOOP;
  48.       inst[i].SrcReg[1].File = PROGRAM_UNDEFINED;
  49.       inst[i].SrcReg[1].Swizzle = SWIZZLE_NOOP;
  50.       inst[i].SrcReg[2].File = PROGRAM_UNDEFINED;
  51.       inst[i].SrcReg[2].Swizzle = SWIZZLE_NOOP;
  52.  
  53.       inst[i].DstReg.File = PROGRAM_UNDEFINED;
  54.       inst[i].DstReg.WriteMask = WRITEMASK_XYZW;
  55.       inst[i].DstReg.CondMask = COND_TR;
  56.       inst[i].DstReg.CondSwizzle = SWIZZLE_NOOP;
  57.  
  58.       inst[i].SaturateMode = SATURATE_OFF;
  59.       inst[i].Precision = FLOAT32;
  60.    }
  61. }
  62.  
  63.  
  64. /**
  65.  * Allocate an array of program instructions.
  66.  * \param numInst  number of instructions
  67.  * \return pointer to instruction memory
  68.  */
  69. struct prog_instruction *
  70. _mesa_alloc_instructions(GLuint numInst)
  71. {
  72.    return
  73.       calloc(numInst, sizeof(struct prog_instruction));
  74. }
  75.  
  76.  
  77. /**
  78.  * Copy an array of program instructions.
  79.  * \param dest  pointer to destination.
  80.  * \param src  pointer to source.
  81.  * \param n  number of instructions to copy.
  82.  * \return pointer to destination.
  83.  */
  84. struct prog_instruction *
  85. _mesa_copy_instructions(struct prog_instruction *dest,
  86.                         const struct prog_instruction *src, GLuint n)
  87. {
  88.    GLuint i;
  89.    memcpy(dest, src, n * sizeof(struct prog_instruction));
  90.    for (i = 0; i < n; i++) {
  91.       if (src[i].Comment)
  92.          dest[i].Comment = strdup(src[i].Comment);
  93.    }
  94.    return dest;
  95. }
  96.  
  97.  
  98. /**
  99.  * Free an array of instructions
  100.  */
  101. void
  102. _mesa_free_instructions(struct prog_instruction *inst, GLuint count)
  103. {
  104.    GLuint i;
  105.    for (i = 0; i < count; i++) {
  106.       free((char *)inst[i].Comment);
  107.    }
  108.    free(inst);
  109. }
  110.  
  111.  
  112. /**
  113.  * Basic info about each instruction
  114.  */
  115. struct instruction_info
  116. {
  117.    gl_inst_opcode Opcode;
  118.    const char *Name;
  119.    GLuint NumSrcRegs;
  120.    GLuint NumDstRegs;
  121. };
  122.  
  123. /**
  124.  * Instruction info
  125.  * \note Opcode should equal array index!
  126.  */
  127. static const struct instruction_info InstInfo[MAX_OPCODE] = {
  128.    { OPCODE_NOP,    "NOP",     0, 0 },
  129.    { OPCODE_ABS,    "ABS",     1, 1 },
  130.    { OPCODE_ADD,    "ADD",     2, 1 },
  131.    { OPCODE_ARL,    "ARL",     1, 1 },
  132.    { OPCODE_BGNLOOP,"BGNLOOP", 0, 0 },
  133.    { OPCODE_BGNSUB, "BGNSUB",  0, 0 },
  134.    { OPCODE_BRK,    "BRK",     0, 0 },
  135.    { OPCODE_CAL,    "CAL",     0, 0 },
  136.    { OPCODE_CMP,    "CMP",     3, 1 },
  137.    { OPCODE_CONT,   "CONT",    0, 0 },
  138.    { OPCODE_COS,    "COS",     1, 1 },
  139.    { OPCODE_DDX,    "DDX",     1, 1 },
  140.    { OPCODE_DDY,    "DDY",     1, 1 },
  141.    { OPCODE_DP2,    "DP2",     2, 1 },
  142.    { OPCODE_DP3,    "DP3",     2, 1 },
  143.    { OPCODE_DP4,    "DP4",     2, 1 },
  144.    { OPCODE_DPH,    "DPH",     2, 1 },
  145.    { OPCODE_DST,    "DST",     2, 1 },
  146.    { OPCODE_ELSE,   "ELSE",    0, 0 },
  147.    { OPCODE_END,    "END",     0, 0 },
  148.    { OPCODE_ENDIF,  "ENDIF",   0, 0 },
  149.    { OPCODE_ENDLOOP,"ENDLOOP", 0, 0 },
  150.    { OPCODE_ENDSUB, "ENDSUB",  0, 0 },
  151.    { OPCODE_EX2,    "EX2",     1, 1 },
  152.    { OPCODE_EXP,    "EXP",     1, 1 },
  153.    { OPCODE_FLR,    "FLR",     1, 1 },
  154.    { OPCODE_FRC,    "FRC",     1, 1 },
  155.    { OPCODE_IF,     "IF",      1, 0 },
  156.    { OPCODE_KIL,    "KIL",     1, 0 },
  157.    { OPCODE_KIL_NV, "KIL_NV",  0, 0 },
  158.    { OPCODE_LG2,    "LG2",     1, 1 },
  159.    { OPCODE_LIT,    "LIT",     1, 1 },
  160.    { OPCODE_LOG,    "LOG",     1, 1 },
  161.    { OPCODE_LRP,    "LRP",     3, 1 },
  162.    { OPCODE_MAD,    "MAD",     3, 1 },
  163.    { OPCODE_MAX,    "MAX",     2, 1 },
  164.    { OPCODE_MIN,    "MIN",     2, 1 },
  165.    { OPCODE_MOV,    "MOV",     1, 1 },
  166.    { OPCODE_MUL,    "MUL",     2, 1 },
  167.    { OPCODE_NOISE1, "NOISE1",  1, 1 },
  168.    { OPCODE_NOISE2, "NOISE2",  1, 1 },
  169.    { OPCODE_NOISE3, "NOISE3",  1, 1 },
  170.    { OPCODE_NOISE4, "NOISE4",  1, 1 },
  171.    { OPCODE_POW,    "POW",     2, 1 },
  172.    { OPCODE_RCP,    "RCP",     1, 1 },
  173.    { OPCODE_RET,    "RET",     0, 0 },
  174.    { OPCODE_RSQ,    "RSQ",     1, 1 },
  175.    { OPCODE_SCS,    "SCS",     1, 1 },
  176.    { OPCODE_SEQ,    "SEQ",     2, 1 },
  177.    { OPCODE_SGE,    "SGE",     2, 1 },
  178.    { OPCODE_SGT,    "SGT",     2, 1 },
  179.    { OPCODE_SIN,    "SIN",     1, 1 },
  180.    { OPCODE_SLE,    "SLE",     2, 1 },
  181.    { OPCODE_SLT,    "SLT",     2, 1 },
  182.    { OPCODE_SNE,    "SNE",     2, 1 },
  183.    { OPCODE_SSG,    "SSG",     1, 1 },
  184.    { OPCODE_SUB,    "SUB",     2, 1 },
  185.    { OPCODE_SWZ,    "SWZ",     1, 1 },
  186.    { OPCODE_TEX,    "TEX",     1, 1 },
  187.    { OPCODE_TXB,    "TXB",     1, 1 },
  188.    { OPCODE_TXD,    "TXD",     3, 1 },
  189.    { OPCODE_TXL,    "TXL",     1, 1 },
  190.    { OPCODE_TXP,    "TXP",     1, 1 },
  191.    { OPCODE_TXP_NV, "TXP_NV",  1, 1 },
  192.    { OPCODE_TRUNC,  "TRUNC",   1, 1 },
  193.    { OPCODE_XPD,    "XPD",     2, 1 }
  194. };
  195.  
  196.  
  197. /**
  198.  * Return the number of src registers for the given instruction/opcode.
  199.  */
  200. GLuint
  201. _mesa_num_inst_src_regs(gl_inst_opcode opcode)
  202. {
  203.    assert(opcode < MAX_OPCODE);
  204.    assert(opcode == InstInfo[opcode].Opcode);
  205.    assert(OPCODE_XPD == InstInfo[OPCODE_XPD].Opcode);
  206.    return InstInfo[opcode].NumSrcRegs;
  207. }
  208.  
  209.  
  210. /**
  211.  * Return the number of dst registers for the given instruction/opcode.
  212.  */
  213. GLuint
  214. _mesa_num_inst_dst_regs(gl_inst_opcode opcode)
  215. {
  216.    assert(opcode < MAX_OPCODE);
  217.    assert(opcode == InstInfo[opcode].Opcode);
  218.    assert(OPCODE_XPD == InstInfo[OPCODE_XPD].Opcode);
  219.    return InstInfo[opcode].NumDstRegs;
  220. }
  221.  
  222.  
  223. GLboolean
  224. _mesa_is_tex_instruction(gl_inst_opcode opcode)
  225. {
  226.    return (opcode == OPCODE_TEX ||
  227.            opcode == OPCODE_TXB ||
  228.            opcode == OPCODE_TXD ||
  229.            opcode == OPCODE_TXL ||
  230.            opcode == OPCODE_TXP);
  231. }
  232.  
  233.  
  234. /**
  235.  * Check if there's a potential src/dst register data dependency when
  236.  * using SOA execution.
  237.  * Example:
  238.  *   MOV T, T.yxwz;
  239.  * This would expand into:
  240.  *   MOV t0, t1;
  241.  *   MOV t1, t0;
  242.  *   MOV t2, t3;
  243.  *   MOV t3, t2;
  244.  * The second instruction will have the wrong value for t0 if executed as-is.
  245.  */
  246. GLboolean
  247. _mesa_check_soa_dependencies(const struct prog_instruction *inst)
  248. {
  249.    GLuint i, chan;
  250.  
  251.    if (inst->DstReg.WriteMask == WRITEMASK_X ||
  252.        inst->DstReg.WriteMask == WRITEMASK_Y ||
  253.        inst->DstReg.WriteMask == WRITEMASK_Z ||
  254.        inst->DstReg.WriteMask == WRITEMASK_W ||
  255.        inst->DstReg.WriteMask == 0x0) {
  256.       /* no chance of data dependency */
  257.       return GL_FALSE;
  258.    }
  259.  
  260.    /* loop over src regs */
  261.    for (i = 0; i < 3; i++) {
  262.       if (inst->SrcReg[i].File == inst->DstReg.File &&
  263.           inst->SrcReg[i].Index == inst->DstReg.Index) {
  264.          /* loop over dest channels */
  265.          GLuint channelsWritten = 0x0;
  266.          for (chan = 0; chan < 4; chan++) {
  267.             if (inst->DstReg.WriteMask & (1 << chan)) {
  268.                /* check if we're reading a channel that's been written */
  269.                GLuint swizzle = GET_SWZ(inst->SrcReg[i].Swizzle, chan);
  270.                if (swizzle <= SWIZZLE_W &&
  271.                    (channelsWritten & (1 << swizzle))) {
  272.                   return GL_TRUE;
  273.                }
  274.  
  275.                channelsWritten |= (1 << chan);
  276.             }
  277.          }
  278.       }
  279.    }
  280.    return GL_FALSE;
  281. }
  282.  
  283.  
  284. /**
  285.  * Return string name for given program opcode.
  286.  */
  287. const char *
  288. _mesa_opcode_string(gl_inst_opcode opcode)
  289. {
  290.    if (opcode < MAX_OPCODE)
  291.       return InstInfo[opcode].Name;
  292.    else {
  293.       static char s[20];
  294.       _mesa_snprintf(s, sizeof(s), "OP%u", opcode);
  295.       return s;
  296.    }
  297. }
  298.  
  299.