src/mesa/drivers/dri/i965/brw_vec4.h

   1 /*
   2  * Copyright © 2011 Intel Corporation
   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  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 #ifndef BRW_VEC4_H
  25 #define BRW_VEC4_H
  26
  27 #include <stdint.h>
  28 #include "brw_shader.h"
  29 #include "main/compiler.h"
  30 #include "program/hash_table.h"
  31
  32 extern "C" {
  33 #include "brw_vs.h"
  34 #include "brw_context.h"
  35 #include "brw_eu.h"
  36 };
  37
  38 #include "glsl/ir.h"
  39
  40 namespace brw {
  41
  42 class dst_reg;
  43
  44 unsigned
  45 swizzle_for_size(int size);
  46
  47 enum register_file {
  48    ARF = BRW_ARCHITECTURE_REGISTER_FILE,
  49    GRF = BRW_GENERAL_REGISTER_FILE,
  50    MRF = BRW_MESSAGE_REGISTER_FILE,
  51    IMM = BRW_IMMEDIATE_VALUE,
  52    HW_REG, /* a struct brw_reg */
  53    ATTR,
  54    UNIFORM, /* prog_data->params[hw_reg] */
  55    BAD_FILE
  56 };
  57
  58 class reg
  59 {
  60 public:
  61    /** Register file: ARF, GRF, MRF, IMM. */
  62    enum register_file file;
  63    /** virtual register number.  0 = fixed hw reg */
  64    int reg;
  65    /** Offset within the virtual register. */
  66    int reg_offset;
  67    /** Register type.  BRW_REGISTER_TYPE_* */
  68    int type;
  69    struct brw_reg fixed_hw_reg;
  70
  71    /** Value for file == BRW_IMMMEDIATE_FILE */
  72    union {
  73       int32_t i;
  74       uint32_t u;
  75       float f;
  76    } imm;
  77 };
  78
  79 class src_reg : public reg
  80 {
  81 public:
  82    /* Callers of this ralloc-based new need not call delete. It's
  83     * easier to just ralloc_free 'ctx' (or any of its ancestors). */
  84    static void* operator new(size_t size, void *ctx)
  85    {
  86       void *node;
  87
  88       node = ralloc_size(ctx, size);
  89       assert(node != NULL);
  90
  91       return node;
  92    }
  93
  94    void init();
  95
  96    src_reg(register_file file, int reg, const glsl_type *type);
  97    src_reg();
  98    src_reg(float f);
  99    src_reg(uint32_t u);
 100    src_reg(int32_t i);
 101
 102    bool equals(src_reg *r);
 103    bool is_zero() const;
 104    bool is_one() const;
 105
 106    src_reg(class vec4_visitor *v, const struct glsl_type *type);
 107
 108    explicit src_reg(dst_reg reg);
 109
 110    GLuint swizzle; /**< SWIZZLE_XYZW swizzles from Mesa. */
 111    bool negate;
 112    bool abs;
 113
 114    src_reg *reladdr;
 115 };
 116
 117 class dst_reg : public reg
 118 {
 119 public:
 120    /* Callers of this ralloc-based new need not call delete. It's
 121     * easier to just ralloc_free 'ctx' (or any of its ancestors). */
 122    static void* operator new(size_t size, void *ctx)
 123    {
 124       void *node;
 125
 126       node = ralloc_size(ctx, size);
 127       assert(node != NULL);
 128
 129       return node;
 130    }
 131
 132    void init();
 133
 134    dst_reg();
 135    dst_reg(register_file file, int reg);
 136    dst_reg(register_file file, int reg, const glsl_type *type, int writemask);
 137    dst_reg(struct brw_reg reg);
 138    dst_reg(class vec4_visitor *v, const struct glsl_type *type);
 139
 140    explicit dst_reg(src_reg reg);
 141
 142    int writemask; /**< Bitfield of WRITEMASK_[XYZW] */
 143
 144    src_reg *reladdr;
 145 };
 146
 147 class vec4_instruction : public backend_instruction {
 148 public:
 149    /* Callers of this ralloc-based new need not call delete. It's
 150     * easier to just ralloc_free 'ctx' (or any of its ancestors). */
 151    static void* operator new(size_t size, void *ctx)
 152    {
 153       void *node;
 154
 155       node = rzalloc_size(ctx, size);
 156       assert(node != NULL);
 157
 158       return node;
 159    }
 160
 161    vec4_instruction(vec4_visitor *v, enum opcode opcode,
 162                     dst_reg dst = dst_reg(),
 163                     src_reg src0 = src_reg(),
 164                     src_reg src1 = src_reg(),
 165                     src_reg src2 = src_reg());
 166
 167    struct brw_reg get_dst(void);
 168    struct brw_reg get_src(int i);
 169
 170    dst_reg dst;
 171    src_reg src[3];
 172
 173    bool saturate;
 174
 175    int conditional_mod; /**< BRW_CONDITIONAL_* */
 176
 177    int sampler;
 178    uint32_t texture_offset; /**< Texture Offset bitfield */
 179    int target; /**< MRT target. */
 180    bool shadow_compare;
 181
 182    bool eot;
 183    bool header_present;
 184    int mlen; /**< SEND message length */
 185    int base_mrf; /**< First MRF in the SEND message, if mlen is nonzero. */
 186
 187    uint32_t offset; /* spill/unspill offset */
 188    /** @{
 189     * Annotation for the generated IR.  One of the two can be set.
 190     */
 191    const void *ir;
 192    const char *annotation;
 193
 194    bool is_tex();
 195    bool is_math();
 196 };
 197
 198 class vec4_visitor : public backend_visitor
 199 {
 200 public:
 201    vec4_visitor(struct brw_context *brw,
 202                 struct brw_vs_compile *c,
 203                 struct gl_shader_program *prog, struct brw_shader *shader);
 204    ~vec4_visitor();
 205
 206    dst_reg dst_null_f()
 207    {
 208       return dst_reg(brw_null_reg());
 209    }
 210
 211    dst_reg dst_null_d()
 212    {
 213       return dst_reg(retype(brw_null_reg(), BRW_REGISTER_TYPE_D));
 214    }
 215
 216    const struct gl_vertex_program *vp;
 217    struct brw_vs_compile *c;
 218    struct brw_vs_prog_data *prog_data;
 219    struct brw_compile *p;
 220
 221    char *fail_msg;
 222    bool failed;
 223
 224    /**
 225     * GLSL IR currently being processed, which is associated with our
 226     * driver IR instructions for debugging purposes.
 227     */
 228    const void *base_ir;
 229    const char *current_annotation;
 230
 231    int *virtual_grf_sizes;
 232    int virtual_grf_count;
 233    int virtual_grf_array_size;
 234    int first_non_payload_grf;
 235    unsigned int max_grf;
 236    int *virtual_grf_def;
 237    int *virtual_grf_use;
 238    dst_reg userplane[MAX_CLIP_PLANES];
 239
 240    src_reg *vp_temp_regs;
 241    src_reg vp_addr_reg;
 242
 243    /**
 244     * This is the size to be used for an array with an element per
 245     * reg_offset
 246     */
 247    int virtual_grf_reg_count;
 248    /** Per-virtual-grf indices into an array of size virtual_grf_reg_count */
 249    int *virtual_grf_reg_map;
 250
 251    bool live_intervals_valid;
 252
 253    dst_reg *variable_storage(ir_variable *var);
 254
 255    void reladdr_to_temp(ir_instruction *ir, src_reg *reg, int *num_reladdr);
 256
 257    bool need_all_constants_in_pull_buffer;
 258
 259    /**
 260     * \name Visit methods
 261     *
 262     * As typical for the visitor pattern, there must be one \c visit method for
 263     * each concrete subclass of \c ir_instruction.  Virtual base classes within
 264     * the hierarchy should not have \c visit methods.
 265     */
 266    /*@{*/
 267    virtual void visit(ir_variable *);
 268    virtual void visit(ir_loop *);
 269    virtual void visit(ir_loop_jump *);
 270    virtual void visit(ir_function_signature *);
 271    virtual void visit(ir_function *);
 272    virtual void visit(ir_expression *);
 273    virtual void visit(ir_swizzle *);
 274    virtual void visit(ir_dereference_variable  *);
 275    virtual void visit(ir_dereference_array *);
 276    virtual void visit(ir_dereference_record *);
 277    virtual void visit(ir_assignment *);
 278    virtual void visit(ir_constant *);
 279    virtual void visit(ir_call *);
 280    virtual void visit(ir_return *);
 281    virtual void visit(ir_discard *);
 282    virtual void visit(ir_texture *);
 283    virtual void visit(ir_if *);
 284    /*@}*/
 285
 286    src_reg result;
 287
 288    /* Regs for vertex results.  Generated at ir_variable visiting time
 289     * for the ir->location's used.
 290     */
 291    dst_reg output_reg[BRW_VERT_RESULT_MAX];
 292    const char *output_reg_annotation[BRW_VERT_RESULT_MAX];
 293    int uniform_size[MAX_UNIFORMS];
 294    int uniform_vector_size[MAX_UNIFORMS];
 295    int uniforms;
 296
 297    struct hash_table *variable_ht;
 298
 299    bool run(void);
 300    void fail(const char *msg, ...);
 301
 302    int virtual_grf_alloc(int size);
 303    void setup_uniform_clipplane_values();
 304    int setup_uniform_values(int loc, const glsl_type *type);
 305    void setup_builtin_uniform_values(ir_variable *ir);
 306    int setup_attributes(int payload_reg);
 307    int setup_uniforms(int payload_reg);
 308    void setup_payload();
 309    bool reg_allocate_trivial();
 310    bool reg_allocate();
 311    void evaluate_spill_costs(float *spill_costs, bool *no_spill);
 312    int choose_spill_reg(struct ra_graph *g);
 313    void spill_reg(int spill_reg);
 314    void move_grf_array_access_to_scratch();
 315    void move_uniform_array_access_to_pull_constants();
 316    void move_push_constants_to_pull_constants();
 317    void split_uniform_registers();
 318    void pack_uniform_registers();
 319    void calculate_live_intervals();
 320    void split_virtual_grfs();
 321    bool dead_code_eliminate();
 322    bool virtual_grf_interferes(int a, int b);
 323    bool opt_copy_propagation();
 324    bool opt_algebraic();
 325    bool opt_compute_to_mrf();
 326
 327    vec4_instruction *emit(vec4_instruction *inst);
 328
 329    vec4_instruction *emit(enum opcode opcode);
 330
 331    vec4_instruction *emit(enum opcode opcode, dst_reg dst, src_reg src0);
 332
 333    vec4_instruction *emit(enum opcode opcode, dst_reg dst,
 334                           src_reg src0, src_reg src1);
 335
 336    vec4_instruction *emit(enum opcode opcode, dst_reg dst,
 337                           src_reg src0, src_reg src1, src_reg src2);
 338
 339    vec4_instruction *emit_before(vec4_instruction *inst,
 340                                  vec4_instruction *new_inst);
 341
 342    vec4_instruction *MOV(dst_reg dst, src_reg src0);
 343    vec4_instruction *NOT(dst_reg dst, src_reg src0);
 344    vec4_instruction *RNDD(dst_reg dst, src_reg src0);
 345    vec4_instruction *RNDE(dst_reg dst, src_reg src0);
 346    vec4_instruction *RNDZ(dst_reg dst, src_reg src0);
 347    vec4_instruction *FRC(dst_reg dst, src_reg src0);
 348    vec4_instruction *ADD(dst_reg dst, src_reg src0, src_reg src1);
 349    vec4_instruction *MUL(dst_reg dst, src_reg src0, src_reg src1);
 350    vec4_instruction *MACH(dst_reg dst, src_reg src0, src_reg src1);
 351    vec4_instruction *MAC(dst_reg dst, src_reg src0, src_reg src1);
 352    vec4_instruction *AND(dst_reg dst, src_reg src0, src_reg src1);
 353    vec4_instruction *OR(dst_reg dst, src_reg src0, src_reg src1);
 354    vec4_instruction *XOR(dst_reg dst, src_reg src0, src_reg src1);
 355    vec4_instruction *DP3(dst_reg dst, src_reg src0, src_reg src1);
 356    vec4_instruction *DP4(dst_reg dst, src_reg src0, src_reg src1);
 357    vec4_instruction *DPH(dst_reg dst, src_reg src0, src_reg src1);
 358    vec4_instruction *SHL(dst_reg dst, src_reg src0, src_reg src1);
 359    vec4_instruction *SHR(dst_reg dst, src_reg src0, src_reg src1);
 360    vec4_instruction *ASR(dst_reg dst, src_reg src0, src_reg src1);
 361    vec4_instruction *CMP(dst_reg dst, src_reg src0, src_reg src1,
 362                          uint32_t condition);
 363    vec4_instruction *IF(src_reg src0, src_reg src1, uint32_t condition);
 364    vec4_instruction *IF(uint32_t predicate);
 365    vec4_instruction *PULL_CONSTANT_LOAD(dst_reg dst, src_reg index);
 366    vec4_instruction *SCRATCH_READ(dst_reg dst, src_reg index);
 367    vec4_instruction *SCRATCH_WRITE(dst_reg dst, src_reg src, src_reg index);
 368
 369    int implied_mrf_writes(vec4_instruction *inst);
 370
 371    bool try_rewrite_rhs_to_dst(ir_assignment *ir,
 372                                dst_reg dst,
 373                                src_reg src,
 374                                vec4_instruction *pre_rhs_inst,
 375                                vec4_instruction *last_rhs_inst);
 376
 377    /** Walks an exec_list of ir_instruction and sends it through this visitor. */
 378    void visit_instructions(const exec_list *list);
 379
 380    void setup_vp_regs();
 381    void emit_attribute_fixups();
 382    void emit_vertex_program_code();
 383    void emit_vp_sop(uint32_t condmod, dst_reg dst,
 384                     src_reg src0, src_reg src1, src_reg one);
 385    dst_reg get_vp_dst_reg(const prog_dst_register &dst);
 386    src_reg get_vp_src_reg(const prog_src_register &src);
 387
 388    void emit_bool_to_cond_code(ir_rvalue *ir, uint32_t *predicate);
 389    void emit_bool_comparison(unsigned int op, dst_reg dst, src_reg src0, src_reg src1);
 390    void emit_if_gen6(ir_if *ir);
 391
 392    void emit_minmax(uint32_t condmod, dst_reg dst, src_reg src0, src_reg src1);
 393
 394    void emit_block_move(dst_reg *dst, src_reg *src,
 395                         const struct glsl_type *type, uint32_t predicate);
 396
 397    void emit_constant_values(dst_reg *dst, ir_constant *value);
 398
 399    /**
 400     * Emit the correct dot-product instruction for the type of arguments
 401     */
 402    void emit_dp(dst_reg dst, src_reg src0, src_reg src1, unsigned elements);
 403
 404    void emit_scalar(ir_instruction *ir, enum prog_opcode op,
 405                     dst_reg dst, src_reg src0);
 406
 407    void emit_scalar(ir_instruction *ir, enum prog_opcode op,
 408                     dst_reg dst, src_reg src0, src_reg src1);
 409
 410    void emit_scs(ir_instruction *ir, enum prog_opcode op,
 411                  dst_reg dst, const src_reg &src);
 412
 413    void emit_math1_gen6(enum opcode opcode, dst_reg dst, src_reg src);
 414    void emit_math1_gen4(enum opcode opcode, dst_reg dst, src_reg src);
 415    void emit_math(enum opcode opcode, dst_reg dst, src_reg src);
 416    void emit_math2_gen6(enum opcode opcode, dst_reg dst, src_reg src0, src_reg src1);
 417    void emit_math2_gen4(enum opcode opcode, dst_reg dst, src_reg src0, src_reg src1);
 418    void emit_math(enum opcode opcode, dst_reg dst, src_reg src0, src_reg src1);
 419
 420    void swizzle_result(ir_texture *ir, src_reg orig_val, int sampler);
 421
 422    void emit_ndc_computation();
 423    void emit_psiz_and_flags(struct brw_reg reg);
 424    void emit_clip_distances(struct brw_reg reg, int offset);
 425    void emit_generic_urb_slot(dst_reg reg, int vert_result);
 426    void emit_urb_slot(int mrf, int vert_result);
 427    void emit_urb_writes(void);
 428
 429    src_reg get_scratch_offset(vec4_instruction *inst,
 430                               src_reg *reladdr, int reg_offset);
 431    src_reg get_pull_constant_offset(vec4_instruction *inst,
 432                                     src_reg *reladdr, int reg_offset);
 433    void emit_scratch_read(vec4_instruction *inst,
 434                           dst_reg dst,
 435                           src_reg orig_src,
 436                           int base_offset);
 437    void emit_scratch_write(vec4_instruction *inst,
 438                            int base_offset);
 439    void emit_pull_constant_load(vec4_instruction *inst,
 440                                 dst_reg dst,
 441                                 src_reg orig_src,
 442                                 int base_offset);
 443
 444    bool try_emit_sat(ir_expression *ir);
 445    void resolve_ud_negate(src_reg *reg);
 446
 447    bool process_move_condition(ir_rvalue *ir);
 448
 449    void generate_code();
 450    void generate_vs_instruction(vec4_instruction *inst,
 451                                 struct brw_reg dst,
 452                                 struct brw_reg *src);
 453
 454    void generate_math1_gen4(vec4_instruction *inst,
 455                             struct brw_reg dst,
 456                             struct brw_reg src);
 457    void generate_math1_gen6(vec4_instruction *inst,
 458                             struct brw_reg dst,
 459                             struct brw_reg src);
 460    void generate_math2_gen4(vec4_instruction *inst,
 461                             struct brw_reg dst,
 462                             struct brw_reg src0,
 463                             struct brw_reg src1);
 464    void generate_math2_gen6(vec4_instruction *inst,
 465                             struct brw_reg dst,
 466                             struct brw_reg src0,
 467                             struct brw_reg src1);
 468    void generate_math2_gen7(vec4_instruction *inst,
 469                             struct brw_reg dst,
 470                             struct brw_reg src0,
 471                             struct brw_reg src1);
 472
 473    void generate_tex(vec4_instruction *inst,
 474                      struct brw_reg dst,
 475                      struct brw_reg src);
 476
 477    void generate_urb_write(vec4_instruction *inst);
 478    void generate_oword_dual_block_offsets(struct brw_reg m1,
 479                                           struct brw_reg index);
 480    void generate_scratch_write(vec4_instruction *inst,
 481                                struct brw_reg dst,
 482                                struct brw_reg src,
 483                                struct brw_reg index);
 484    void generate_scratch_read(vec4_instruction *inst,
 485                               struct brw_reg dst,
 486                               struct brw_reg index);
 487    void generate_pull_constant_load(vec4_instruction *inst,
 488                                     struct brw_reg dst,
 489                                     struct brw_reg index,
 490                                     struct brw_reg offset);
 491
 492    void dump_instruction(vec4_instruction *inst);
 493    void dump_instructions();
 494 };
 495
 496 } /* namespace brw */
 497
 498 #endif /* BRW_VEC4_H */