src/mesa/drivers/dri/i965/brw_eu.c

   1 /*
   2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
   3  Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
   4  develop this 3D driver.
   5
   6  Permission is hereby granted, free of charge, to any person obtaining
   7  a 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, sublicense, 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 above copyright notice and this permission notice (including the
  15  next paragraph) shall be included in all copies or substantial
  16  portions of the Software.
  17
  18  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  21  IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  22  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25
  26  **********************************************************************/
  27  /*
  28   * Authors:
  29   *   Keith Whitwell <keith@tungstengraphics.com>
  30   */
  31
  32
  33 #include "brw_context.h"
  34 #include "brw_defines.h"
  35 #include "brw_eu.h"
  36
  37 /* Returns the corresponding conditional mod for swapping src0 and
  38  * src1 in e.g. CMP.
  39  */
  40 uint32_t
  41 brw_swap_cmod(uint32_t cmod)
  42 {
  43    switch (cmod) {
  44    case BRW_CONDITIONAL_Z:
  45    case BRW_CONDITIONAL_NZ:
  46       return cmod;
  47    case BRW_CONDITIONAL_G:
  48       return BRW_CONDITIONAL_LE;
  49    case BRW_CONDITIONAL_GE:
  50       return BRW_CONDITIONAL_L;
  51    case BRW_CONDITIONAL_L:
  52       return BRW_CONDITIONAL_GE;
  53    case BRW_CONDITIONAL_LE:
  54       return BRW_CONDITIONAL_G;
  55    default:
  56       return ~0;
  57    }
  58 }
  59
  60
  61 /* How does predicate control work when execution_size != 8?  Do I
  62  * need to test/set for 0xffff when execution_size is 16?
  63  */
  64 void brw_set_predicate_control_flag_value( struct brw_compile *p, GLuint value )
  65 {
  66    p->current->header.predicate_control = BRW_PREDICATE_NONE;
  67
  68    if (value != 0xff) {
  69       if (value != p->flag_value) {
  70          brw_push_insn_state(p);
  71          brw_MOV(p, brw_flag_reg(), brw_imm_uw(value));
  72          p->flag_value = value;
  73          brw_pop_insn_state(p);
  74       }
  75
  76       p->current->header.predicate_control = BRW_PREDICATE_NORMAL;
  77    }
  78 }
  79
  80 void brw_set_predicate_control( struct brw_compile *p, GLuint pc )
  81 {
  82    p->current->header.predicate_control = pc;
  83 }
  84
  85 void brw_set_conditionalmod( struct brw_compile *p, GLuint conditional )
  86 {
  87    p->current->header.destreg__conditionalmod = conditional;
  88 }
  89
  90 void brw_set_access_mode( struct brw_compile *p, GLuint access_mode )
  91 {
  92    p->current->header.access_mode = access_mode;
  93 }
  94
  95 void brw_set_compression_control( struct brw_compile *p, GLboolean compression_control )
  96 {
  97    p->compressed = (compression_control == BRW_COMPRESSION_COMPRESSED);
  98
  99    if (p->brw->intel.gen >= 6) {
 100       /* Since we don't use the 32-wide support in gen6, we translate
 101        * the pre-gen6 compression control here.
 102        */
 103       switch (compression_control) {
 104       case BRW_COMPRESSION_NONE:
 105          /* This is the "use the first set of bits of dmask/vmask/arf
 106           * according to execsize" option.
 107           */
 108          p->current->header.compression_control = GEN6_COMPRESSION_1Q;
 109          break;
 110       case BRW_COMPRESSION_2NDHALF:
 111          /* For 8-wide, this is "use the second set of 8 bits." */
 112          p->current->header.compression_control = GEN6_COMPRESSION_2Q;
 113          break;
 114       case BRW_COMPRESSION_COMPRESSED:
 115          /* For 16-wide instruction compression, use the first set of 16 bits
 116           * since we don't do 32-wide dispatch.
 117           */
 118          p->current->header.compression_control = GEN6_COMPRESSION_1H;
 119          break;
 120       default:
 121          assert(!"not reached");
 122          p->current->header.compression_control = GEN6_COMPRESSION_1H;
 123          break;
 124       }
 125    } else {
 126       p->current->header.compression_control = compression_control;
 127    }
 128 }
 129
 130 void brw_set_mask_control( struct brw_compile *p, GLuint value )
 131 {
 132    p->current->header.mask_control = value;
 133 }
 134
 135 void brw_set_saturate( struct brw_compile *p, GLuint value )
 136 {
 137    p->current->header.saturate = value;
 138 }
 139
 140 void brw_set_acc_write_control(struct brw_compile *p, GLuint value)
 141 {
 142    if (p->brw->intel.gen >= 6)
 143       p->current->header.acc_wr_control = value;
 144 }
 145
 146 void brw_push_insn_state( struct brw_compile *p )
 147 {
 148    assert(p->current != &p->stack[BRW_EU_MAX_INSN_STACK-1]);
 149    memcpy(p->current+1, p->current, sizeof(struct brw_instruction));
 150    p->compressed_stack[p->current - p->stack] = p->compressed;
 151    p->current++;
 152 }
 153
 154 void brw_pop_insn_state( struct brw_compile *p )
 155 {
 156    assert(p->current != p->stack);
 157    p->current--;
 158    p->compressed = p->compressed_stack[p->current - p->stack];
 159 }
 160
 161
 162 /***********************************************************************
 163  */
 164 void brw_init_compile( struct brw_context *brw, struct brw_compile *p )
 165 {
 166    p->brw = brw;
 167    p->nr_insn = 0;
 168    p->current = p->stack;
 169    p->compressed = false;
 170    memset(p->current, 0, sizeof(p->current[0]));
 171
 172    /* Some defaults?
 173     */
 174    brw_set_mask_control(p, BRW_MASK_ENABLE); /* what does this do? */
 175    brw_set_saturate(p, 0);
 176    brw_set_compression_control(p, BRW_COMPRESSION_NONE);
 177    brw_set_predicate_control_flag_value(p, 0xff);
 178 }
 179
 180
 181 const GLuint *brw_get_program( struct brw_compile *p,
 182                                GLuint *sz )
 183 {
 184    GLuint i;
 185
 186    for (i = 0; i < 8; i++)
 187       brw_NOP(p);
 188
 189    *sz = p->nr_insn * sizeof(struct brw_instruction);
 190    return (const GLuint *)p->store;
 191 }
 192
 193
 194
 195 /**
 196  * Subroutine calls require special attention.
 197  * Mesa instructions may be expanded into multiple hardware instructions
 198  * so the prog_instruction::BranchTarget field can't be used as an index
 199  * into the hardware instructions.
 200  *
 201  * The BranchTarget field isn't needed, however.  Mesa's GLSL compiler
 202  * emits CAL and BGNSUB instructions with labels that can be used to map
 203  * subroutine calls to actual subroutine code blocks.
 204  *
 205  * The structures and function here implement patching of CAL instructions
 206  * so they jump to the right subroutine code...
 207  */
 208
 209
 210 /**
 211  * For each OPCODE_BGNSUB we create one of these.
 212  */
 213 struct brw_glsl_label
 214 {
 215    const char *name; /**< the label string */
 216    GLuint position;  /**< the position of the brw instruction for this label */
 217    struct brw_glsl_label *next;  /**< next in linked list */
 218 };
 219
 220
 221 /**
 222  * For each OPCODE_CAL we create one of these.
 223  */
 224 struct brw_glsl_call
 225 {
 226    GLuint call_inst_pos;  /**< location of the CAL instruction */
 227    const char *sub_name;  /**< name of subroutine to call */
 228    struct brw_glsl_call *next;  /**< next in linked list */
 229 };
 230
 231
 232 /**
 233  * Called for each OPCODE_BGNSUB.
 234  */
 235 void
 236 brw_save_label(struct brw_compile *c, const char *name, GLuint position)
 237 {
 238    struct brw_glsl_label *label = CALLOC_STRUCT(brw_glsl_label);
 239    label->name = name;
 240    label->position = position;
 241    label->next = c->first_label;
 242    c->first_label = label;
 243 }
 244
 245
 246 /**
 247  * Called for each OPCODE_CAL.
 248  */
 249 void
 250 brw_save_call(struct brw_compile *c, const char *name, GLuint call_pos)
 251 {
 252    struct brw_glsl_call *call = CALLOC_STRUCT(brw_glsl_call);
 253    call->call_inst_pos = call_pos;
 254    call->sub_name = name;
 255    call->next = c->first_call;
 256    c->first_call = call;
 257 }
 258
 259
 260 /**
 261  * Lookup a label, return label's position/offset.
 262  */
 263 static GLuint
 264 brw_lookup_label(struct brw_compile *c, const char *name)
 265 {
 266    const struct brw_glsl_label *label;
 267    for (label = c->first_label; label; label = label->next) {
 268       if (strcmp(name, label->name) == 0) {
 269          return label->position;
 270       }
 271    }
 272    abort();  /* should never happen */
 273    return ~0;
 274 }
 275
 276
 277 /**
 278  * When we're done generating code, this function is called to resolve
 279  * subroutine calls.
 280  */
 281 void
 282 brw_resolve_cals(struct brw_compile *c)
 283 {
 284     const struct brw_glsl_call *call;
 285
 286     for (call = c->first_call; call; call = call->next) {
 287         const GLuint sub_loc = brw_lookup_label(c, call->sub_name);
 288         struct brw_instruction *brw_call_inst = &c->store[call->call_inst_pos];
 289         struct brw_instruction *brw_sub_inst = &c->store[sub_loc];
 290         GLint offset = brw_sub_inst - brw_call_inst;
 291
 292         /* patch brw_inst1 to point to brw_inst2 */
 293         brw_set_src1(brw_call_inst, brw_imm_d(offset * 16));
 294     }
 295
 296     /* free linked list of calls */
 297     {
 298         struct brw_glsl_call *call, *next;
 299         for (call = c->first_call; call; call = next) {
 300             next = call->next;
 301             free(call);
 302         }
 303         c->first_call = NULL;
 304     }
 305
 306     /* free linked list of labels */
 307     {
 308         struct brw_glsl_label *label, *next;
 309         for (label = c->first_label; label; label = next) {
 310             next = label->next;
 311             free(label);
 312         }
 313         c->first_label = NULL;
 314     }
 315 }