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 #include "brw_program.h"
  32
  33 #ifdef __cplusplus
  34 #include "brw_ir_vec4.h"
  35
  36 extern "C" {
  37 #endif
  38
  39 #include "brw_context.h"
  40 #include "brw_eu.h"
  41 #include "intel_asm_annotation.h"
  42
  43 #ifdef __cplusplus
  44 }; /* extern "C" */
  45 #endif
  46
  47 #include "glsl/ir.h"
  48 #include "glsl/nir/nir.h"
  49
  50
  51 #ifdef __cplusplus
  52 extern "C" {
  53 #endif
  54
  55 void
  56 brw_vue_setup_prog_key_for_precompile(struct gl_context *ctx,
  57                                       struct brw_vue_prog_key *key,
  58                                       GLuint id, struct gl_program *prog);
  59
  60 #ifdef __cplusplus
  61 } /* extern "C" */
  62
  63 namespace brw {
  64
  65 class vec4_live_variables;
  66
  67 /**
  68  * The vertex shader front-end.
  69  *
  70  * Translates either GLSL IR or Mesa IR (for ARB_vertex_program and
  71  * fixed-function) into VS IR.
  72  */
  73 class vec4_visitor : public backend_shader, public ir_visitor
  74 {
  75 public:
  76    vec4_visitor(const struct brw_compiler *compiler,
  77                 void *log_data,
  78                 struct gl_program *prog,
  79                 const struct brw_vue_prog_key *key,
  80                 struct brw_vue_prog_data *prog_data,
  81                 struct gl_shader_program *shader_prog,
  82                 gl_shader_stage stage,
  83                 void *mem_ctx,
  84                 bool no_spills,
  85                 int shader_time_index);
  86    ~vec4_visitor();
  87
  88    dst_reg dst_null_f()
  89    {
  90       return dst_reg(brw_null_reg());
  91    }
  92
  93    dst_reg dst_null_d()
  94    {
  95       return dst_reg(retype(brw_null_reg(), BRW_REGISTER_TYPE_D));
  96    }
  97
  98    dst_reg dst_null_ud()
  99    {
 100       return dst_reg(retype(brw_null_reg(), BRW_REGISTER_TYPE_UD));
 101    }
 102
 103    const struct brw_vue_prog_key * const key;
 104    struct brw_vue_prog_data * const prog_data;
 105    unsigned int sanity_param_count;
 106
 107    char *fail_msg;
 108    bool failed;
 109
 110    /**
 111     * GLSL IR currently being processed, which is associated with our
 112     * driver IR instructions for debugging purposes.
 113     */
 114    const void *base_ir;
 115    const char *current_annotation;
 116
 117    int first_non_payload_grf;
 118    unsigned int max_grf;
 119    int *virtual_grf_start;
 120    int *virtual_grf_end;
 121    brw::vec4_live_variables *live_intervals;
 122    dst_reg userplane[MAX_CLIP_PLANES];
 123
 124    dst_reg *variable_storage(ir_variable *var);
 125
 126    void reladdr_to_temp(ir_instruction *ir, src_reg *reg, int *num_reladdr);
 127
 128    bool need_all_constants_in_pull_buffer;
 129
 130    /**
 131     * \name Visit methods
 132     *
 133     * As typical for the visitor pattern, there must be one \c visit method for
 134     * each concrete subclass of \c ir_instruction.  Virtual base classes within
 135     * the hierarchy should not have \c visit methods.
 136     */
 137    /*@{*/
 138    virtual void visit(ir_variable *);
 139    virtual void visit(ir_loop *);
 140    virtual void visit(ir_loop_jump *);
 141    virtual void visit(ir_function_signature *);
 142    virtual void visit(ir_function *);
 143    virtual void visit(ir_expression *);
 144    virtual void visit(ir_swizzle *);
 145    virtual void visit(ir_dereference_variable  *);
 146    virtual void visit(ir_dereference_array *);
 147    virtual void visit(ir_dereference_record *);
 148    virtual void visit(ir_assignment *);
 149    virtual void visit(ir_constant *);
 150    virtual void visit(ir_call *);
 151    virtual void visit(ir_return *);
 152    virtual void visit(ir_discard *);
 153    virtual void visit(ir_texture *);
 154    virtual void visit(ir_if *);
 155    virtual void visit(ir_emit_vertex *);
 156    virtual void visit(ir_end_primitive *);
 157    virtual void visit(ir_barrier *);
 158    /*@}*/
 159
 160    src_reg result;
 161
 162    /* Regs for vertex results.  Generated at ir_variable visiting time
 163     * for the ir->location's used.
 164     */
 165    dst_reg output_reg[BRW_VARYING_SLOT_COUNT];
 166    const char *output_reg_annotation[BRW_VARYING_SLOT_COUNT];
 167    int *uniform_size;
 168    int *uniform_vector_size;
 169    int uniform_array_size; /*< Size of uniform_[vector_]size arrays */
 170    int uniforms;
 171
 172    src_reg shader_start_time;
 173
 174    struct hash_table *variable_ht;
 175
 176    bool run(gl_clip_plane *clip_planes);
 177    void fail(const char *msg, ...);
 178
 179    void setup_uniform_clipplane_values(gl_clip_plane *clip_planes);
 180    virtual void setup_vector_uniform_values(const gl_constant_value *values,
 181                                             unsigned n);
 182    void setup_uniform_values(ir_variable *ir);
 183    void setup_builtin_uniform_values(ir_variable *ir);
 184    int setup_uniforms(int payload_reg);
 185
 186    bool reg_allocate_trivial();
 187    bool reg_allocate();
 188    void evaluate_spill_costs(float *spill_costs, bool *no_spill);
 189    int choose_spill_reg(struct ra_graph *g);
 190    void spill_reg(int spill_reg);
 191    void move_grf_array_access_to_scratch();
 192    void move_uniform_array_access_to_pull_constants();
 193    void move_push_constants_to_pull_constants();
 194    void split_uniform_registers();
 195    void pack_uniform_registers();
 196    void calculate_live_intervals();
 197    void invalidate_live_intervals();
 198    void split_virtual_grfs();
 199    bool opt_vector_float();
 200    bool opt_reduce_swizzle();
 201    bool dead_code_eliminate();
 202    int var_range_start(unsigned v, unsigned n) const;
 203    int var_range_end(unsigned v, unsigned n) const;
 204    bool virtual_grf_interferes(int a, int b);
 205    bool opt_copy_propagation(bool do_constant_prop = true);
 206    bool opt_cse_local(bblock_t *block);
 207    bool opt_cse();
 208    bool opt_algebraic();
 209    bool opt_register_coalesce();
 210    bool eliminate_find_live_channel();
 211    bool is_dep_ctrl_unsafe(const vec4_instruction *inst);
 212    void opt_set_dependency_control();
 213    void opt_schedule_instructions();
 214
 215    vec4_instruction *emit(vec4_instruction *inst);
 216
 217    vec4_instruction *emit(enum opcode opcode);
 218    vec4_instruction *emit(enum opcode opcode, const dst_reg &dst);
 219    vec4_instruction *emit(enum opcode opcode, const dst_reg &dst,
 220                           const src_reg &src0);
 221    vec4_instruction *emit(enum opcode opcode, const dst_reg &dst,
 222                           const src_reg &src0, const src_reg &src1);
 223    vec4_instruction *emit(enum opcode opcode, const dst_reg &dst,
 224                           const src_reg &src0, const src_reg &src1,
 225                           const src_reg &src2);
 226
 227    vec4_instruction *emit_before(bblock_t *block,
 228                                  vec4_instruction *inst,
 229                                  vec4_instruction *new_inst);
 230
 231 #define EMIT1(op) vec4_instruction *op(const dst_reg &, const src_reg &);
 232 #define EMIT2(op) vec4_instruction *op(const dst_reg &, const src_reg &, const src_reg &);
 233 #define EMIT3(op) vec4_instruction *op(const dst_reg &, const src_reg &, const src_reg &, const src_reg &);
 234    EMIT1(MOV)
 235    EMIT1(NOT)
 236    EMIT1(RNDD)
 237    EMIT1(RNDE)
 238    EMIT1(RNDZ)
 239    EMIT1(FRC)
 240    EMIT1(F32TO16)
 241    EMIT1(F16TO32)
 242    EMIT2(ADD)
 243    EMIT2(MUL)
 244    EMIT2(MACH)
 245    EMIT2(MAC)
 246    EMIT2(AND)
 247    EMIT2(OR)
 248    EMIT2(XOR)
 249    EMIT2(DP3)
 250    EMIT2(DP4)
 251    EMIT2(DPH)
 252    EMIT2(SHL)
 253    EMIT2(SHR)
 254    EMIT2(ASR)
 255    vec4_instruction *CMP(dst_reg dst, src_reg src0, src_reg src1,
 256                          enum brw_conditional_mod condition);
 257    vec4_instruction *IF(src_reg src0, src_reg src1,
 258                         enum brw_conditional_mod condition);
 259    vec4_instruction *IF(enum brw_predicate predicate);
 260    EMIT1(SCRATCH_READ)
 261    EMIT2(SCRATCH_WRITE)
 262    EMIT3(LRP)
 263    EMIT1(BFREV)
 264    EMIT3(BFE)
 265    EMIT2(BFI1)
 266    EMIT3(BFI2)
 267    EMIT1(FBH)
 268    EMIT1(FBL)
 269    EMIT1(CBIT)
 270    EMIT3(MAD)
 271    EMIT2(ADDC)
 272    EMIT2(SUBB)
 273 #undef EMIT1
 274 #undef EMIT2
 275 #undef EMIT3
 276
 277    int implied_mrf_writes(vec4_instruction *inst);
 278
 279    bool try_rewrite_rhs_to_dst(ir_assignment *ir,
 280                                dst_reg dst,
 281                                src_reg src,
 282                                vec4_instruction *pre_rhs_inst,
 283                                vec4_instruction *last_rhs_inst);
 284
 285    /** Walks an exec_list of ir_instruction and sends it through this visitor. */
 286    void visit_instructions(const exec_list *list);
 287
 288    void emit_vp_sop(enum brw_conditional_mod condmod, dst_reg dst,
 289                     src_reg src0, src_reg src1, src_reg one);
 290
 291    void emit_bool_to_cond_code(ir_rvalue *ir, enum brw_predicate *predicate);
 292    void emit_if_gen6(ir_if *ir);
 293
 294    void emit_minmax(enum brw_conditional_mod conditionalmod, dst_reg dst,
 295                     src_reg src0, src_reg src1);
 296
 297    void emit_lrp(const dst_reg &dst,
 298                  const src_reg &x, const src_reg &y, const src_reg &a);
 299
 300    /**
 301     * Copy any live channel from \p src to the first channel of the
 302     * result.
 303     */
 304    src_reg emit_uniformize(const src_reg &src);
 305
 306    void emit_block_move(dst_reg *dst, src_reg *src,
 307                         const struct glsl_type *type, brw_predicate predicate);
 308
 309    void emit_constant_values(dst_reg *dst, ir_constant *value);
 310
 311    /**
 312     * Emit the correct dot-product instruction for the type of arguments
 313     */
 314    void emit_dp(dst_reg dst, src_reg src0, src_reg src1, unsigned elements);
 315
 316    void emit_scalar(ir_instruction *ir, enum prog_opcode op,
 317                     dst_reg dst, src_reg src0);
 318
 319    void emit_scalar(ir_instruction *ir, enum prog_opcode op,
 320                     dst_reg dst, src_reg src0, src_reg src1);
 321
 322    src_reg fix_3src_operand(src_reg src);
 323
 324    void emit_math(enum opcode opcode, const dst_reg &dst, const src_reg &src0,
 325                   const src_reg &src1 = src_reg());
 326    src_reg fix_math_operand(src_reg src);
 327
 328    void emit_pack_half_2x16(dst_reg dst, src_reg src0);
 329    void emit_unpack_half_2x16(dst_reg dst, src_reg src0);
 330    void emit_unpack_unorm_4x8(const dst_reg &dst, src_reg src0);
 331    void emit_unpack_snorm_4x8(const dst_reg &dst, src_reg src0);
 332    void emit_pack_unorm_4x8(const dst_reg &dst, const src_reg &src0);
 333    void emit_pack_snorm_4x8(const dst_reg &dst, const src_reg &src0);
 334
 335    uint32_t gather_channel(ir_texture *ir, uint32_t sampler);
 336    src_reg emit_mcs_fetch(ir_texture *ir, src_reg coordinate, src_reg sampler);
 337    void emit_gen6_gather_wa(uint8_t wa, dst_reg dst);
 338    void swizzle_result(ir_texture *ir, src_reg orig_val, uint32_t sampler);
 339
 340    void emit_ndc_computation();
 341    void emit_psiz_and_flags(dst_reg reg);
 342    void emit_clip_distances(dst_reg reg, int offset);
 343    vec4_instruction *emit_generic_urb_slot(dst_reg reg, int varying);
 344    void emit_urb_slot(dst_reg reg, int varying);
 345
 346    void emit_shader_time_begin();
 347    void emit_shader_time_end();
 348    void emit_shader_time_write(int shader_time_subindex, src_reg value);
 349
 350    void emit_untyped_atomic(unsigned atomic_op, unsigned surf_index,
 351                             dst_reg dst, src_reg offset, src_reg src0,
 352                             src_reg src1);
 353
 354    void emit_untyped_surface_read(unsigned surf_index, dst_reg dst,
 355                                   src_reg offset);
 356
 357    src_reg get_scratch_offset(bblock_t *block, vec4_instruction *inst,
 358                               src_reg *reladdr, int reg_offset);
 359    src_reg get_pull_constant_offset(bblock_t *block, vec4_instruction *inst,
 360                                     src_reg *reladdr, int reg_offset);
 361    void emit_scratch_read(bblock_t *block, vec4_instruction *inst,
 362                           dst_reg dst,
 363                           src_reg orig_src,
 364                           int base_offset);
 365    void emit_scratch_write(bblock_t *block, vec4_instruction *inst,
 366                            int base_offset);
 367    void emit_pull_constant_load(bblock_t *block, vec4_instruction *inst,
 368                                 dst_reg dst,
 369                                 src_reg orig_src,
 370                                 int base_offset);
 371    void emit_pull_constant_load_reg(dst_reg dst,
 372                                     src_reg surf_index,
 373                                     src_reg offset,
 374                                     bblock_t *before_block,
 375                                     vec4_instruction *before_inst);
 376    src_reg emit_resolve_reladdr(int scratch_loc[], bblock_t *block,
 377                                 vec4_instruction *inst, src_reg src);
 378
 379    bool try_emit_mad(ir_expression *ir);
 380    bool try_emit_b2f_of_compare(ir_expression *ir);
 381    void resolve_ud_negate(src_reg *reg);
 382    void resolve_bool_comparison(ir_rvalue *rvalue, src_reg *reg);
 383
 384    src_reg get_timestamp();
 385
 386    bool process_move_condition(ir_rvalue *ir);
 387
 388    void dump_instruction(backend_instruction *inst);
 389    void dump_instruction(backend_instruction *inst, FILE *file);
 390
 391    void visit_atomic_counter_intrinsic(ir_call *ir);
 392
 393    int type_size(const struct glsl_type *type);
 394
 395    virtual void emit_nir_code();
 396    virtual void nir_setup_inputs(nir_shader *shader);
 397    virtual void nir_setup_uniforms(nir_shader *shader);
 398    virtual void nir_setup_uniform(nir_variable *var);
 399    virtual void nir_setup_builtin_uniform(nir_variable *var);
 400    virtual void nir_setup_system_values(nir_shader *shader);
 401    virtual void nir_emit_impl(nir_function_impl *impl);
 402    virtual void nir_emit_cf_list(exec_list *list);
 403    virtual void nir_emit_if(nir_if *if_stmt);
 404    virtual void nir_emit_loop(nir_loop *loop);
 405    virtual void nir_emit_block(nir_block *block);
 406    virtual void nir_emit_instr(nir_instr *instr);
 407    virtual void nir_emit_load_const(nir_load_const_instr *instr);
 408    virtual void nir_emit_intrinsic(nir_intrinsic_instr *instr);
 409    virtual void nir_emit_alu(nir_alu_instr *instr);
 410    virtual void nir_emit_jump(nir_jump_instr *instr);
 411    virtual void nir_emit_texture(nir_tex_instr *instr);
 412
 413 protected:
 414    void emit_vertex();
 415    void lower_attributes_to_hw_regs(const int *attribute_map,
 416                                     bool interleaved);
 417    void setup_payload_interference(struct ra_graph *g, int first_payload_node,
 418                                    int reg_node_count);
 419    virtual dst_reg *make_reg_for_system_value(ir_variable *ir) = 0;
 420    virtual void assign_binding_table_offsets();
 421    virtual void setup_payload() = 0;
 422    virtual void emit_prolog() = 0;
 423    virtual void emit_program_code() = 0;
 424    virtual void emit_thread_end() = 0;
 425    virtual void emit_urb_write_header(int mrf) = 0;
 426    virtual vec4_instruction *emit_urb_write_opcode(bool complete) = 0;
 427    virtual int compute_array_stride(ir_dereference_array *ir);
 428
 429 private:
 430    /**
 431     * If true, then register allocation should fail instead of spilling.
 432     */
 433    const bool no_spills;
 434
 435    int shader_time_index;
 436
 437    unsigned last_scratch; /**< measured in 32-byte (register size) units */
 438 };
 439
 440
 441 /**
 442  * The vertex shader code generator.
 443  *
 444  * Translates VS IR to actual i965 assembly code.
 445  */
 446 class vec4_generator
 447 {
 448 public:
 449    vec4_generator(const struct brw_compiler *compiler, void *log_data,
 450                   struct gl_shader_program *shader_prog,
 451                   struct gl_program *prog,
 452                   struct brw_vue_prog_data *prog_data,
 453                   void *mem_ctx,
 454                   bool debug_flag,
 455                   const char *stage_name,
 456                   const char *stage_abbrev);
 457    ~vec4_generator();
 458
 459    const unsigned *generate_assembly(const cfg_t *cfg, unsigned *asm_size);
 460
 461 private:
 462    void generate_code(const cfg_t *cfg);
 463
 464    void generate_math1_gen4(vec4_instruction *inst,
 465                             struct brw_reg dst,
 466                             struct brw_reg src);
 467    void generate_math2_gen4(vec4_instruction *inst,
 468                             struct brw_reg dst,
 469                             struct brw_reg src0,
 470                             struct brw_reg src1);
 471    void generate_math_gen6(vec4_instruction *inst,
 472                            struct brw_reg dst,
 473                            struct brw_reg src0,
 474                            struct brw_reg src1);
 475
 476    void generate_tex(vec4_instruction *inst,
 477                      struct brw_reg dst,
 478                      struct brw_reg src,
 479                      struct brw_reg sampler_index);
 480
 481    void generate_vs_urb_write(vec4_instruction *inst);
 482    void generate_gs_urb_write(vec4_instruction *inst);
 483    void generate_gs_urb_write_allocate(vec4_instruction *inst);
 484    void generate_gs_thread_end(vec4_instruction *inst);
 485    void generate_gs_set_write_offset(struct brw_reg dst,
 486                                      struct brw_reg src0,
 487                                      struct brw_reg src1);
 488    void generate_gs_set_vertex_count(struct brw_reg dst,
 489                                      struct brw_reg src);
 490    void generate_gs_svb_write(vec4_instruction *inst,
 491                               struct brw_reg dst,
 492                               struct brw_reg src0,
 493                               struct brw_reg src1);
 494    void generate_gs_svb_set_destination_index(vec4_instruction *inst,
 495                                               struct brw_reg dst,
 496                                               struct brw_reg src);
 497    void generate_gs_set_dword_2(struct brw_reg dst, struct brw_reg src);
 498    void generate_gs_prepare_channel_masks(struct brw_reg dst);
 499    void generate_gs_set_channel_masks(struct brw_reg dst, struct brw_reg src);
 500    void generate_gs_get_instance_id(struct brw_reg dst);
 501    void generate_gs_ff_sync_set_primitives(struct brw_reg dst,
 502                                            struct brw_reg src0,
 503                                            struct brw_reg src1,
 504                                            struct brw_reg src2);
 505    void generate_gs_ff_sync(vec4_instruction *inst,
 506                             struct brw_reg dst,
 507                             struct brw_reg src0,
 508                             struct brw_reg src1);
 509    void generate_gs_set_primitive_id(struct brw_reg dst);
 510    void generate_oword_dual_block_offsets(struct brw_reg m1,
 511                                           struct brw_reg index);
 512    void generate_scratch_write(vec4_instruction *inst,
 513                                struct brw_reg dst,
 514                                struct brw_reg src,
 515                                struct brw_reg index);
 516    void generate_scratch_read(vec4_instruction *inst,
 517                               struct brw_reg dst,
 518                               struct brw_reg index);
 519    void generate_pull_constant_load(vec4_instruction *inst,
 520                                     struct brw_reg dst,
 521                                     struct brw_reg index,
 522                                     struct brw_reg offset);
 523    void generate_pull_constant_load_gen7(vec4_instruction *inst,
 524                                          struct brw_reg dst,
 525                                          struct brw_reg surf_index,
 526                                          struct brw_reg offset);
 527    void generate_set_simd4x2_header_gen9(vec4_instruction *inst,
 528                                          struct brw_reg dst);
 529    void generate_unpack_flags(struct brw_reg dst);
 530
 531    const struct brw_compiler *compiler;
 532    void *log_data; /* Passed to compiler->*_log functions */
 533
 534    const struct brw_device_info *devinfo;
 535
 536    struct brw_codegen *p;
 537
 538    struct gl_shader_program *shader_prog;
 539    const struct gl_program *prog;
 540
 541    struct brw_vue_prog_data *prog_data;
 542
 543    void *mem_ctx;
 544    const char *stage_name;
 545    const char *stage_abbrev;
 546    const bool debug_flag;
 547 };
 548
 549 } /* namespace brw */
 550 #endif /* __cplusplus */
 551
 552 #endif /* BRW_VEC4_H */