src/panfrost/bifrost/bifrost.h

   1 /*
   2  * Copyright (C) 2019 Connor Abbott <cwabbott0@gmail.com>
   3  * Copyright (C) 2019 Lyude Paul <thatslyude@gmail.com>
   4  * Copyright (C) 2019 Ryan Houdek <Sonicadvance1@gmail.com>
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the next
  14  * paragraph) shall be included in all copies or substantial portions of the
  15  * Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * 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 OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23  * SOFTWARE.
  24  */
  25
  26 #ifndef __bifrost_h__
  27 #define __bifrost_h__
  28
  29 #include <stdint.h>
  30 #include <stdbool.h>
  31
  32 enum bifrost_clause_type {
  33         BIFROST_CLAUSE_NONE       = 0,
  34         BIFROST_CLAUSE_LOAD_VARY  = 1,
  35         BIFROST_CLAUSE_UBO        = 2,
  36         BIFROST_CLAUSE_TEX        = 3,
  37         BIFROST_CLAUSE_SSBO_LOAD  = 5,
  38         BIFROST_CLAUSE_SSBO_STORE = 6,
  39         BIFROST_CLAUSE_BLEND      = 9,
  40         BIFROST_CLAUSE_ATEST      = 13,
  41         BIFROST_CLAUSE_64BIT      = 15
  42 };
  43
  44 struct bifrost_header {
  45         unsigned unk0 : 7;
  46         // If true, convert any infinite result of any floating-point operation to
  47         // the biggest representable number.
  48         unsigned suppress_inf: 1;
  49         // Convert any NaN results to 0.
  50         unsigned suppress_nan : 1;
  51         unsigned unk1 : 2;
  52         // true if the execution mask of the next clause is the same as the mask of
  53         // the current clause.
  54         unsigned back_to_back : 1;
  55         unsigned no_end_of_shader: 1;
  56         unsigned unk2 : 2;
  57         // Set to true for fragment shaders, to implement this bit of spec text
  58         // from section 7.1.5 of the GLSL ES spec:
  59         //
  60         // "Stores to image and buffer variables performed by helper invocations
  61         // have no effect on the underlying image or buffer memory."
  62         //
  63         // Helper invocations are threads (invocations) corresponding to pixels in
  64         // a quad that aren't actually part of the triangle, but are included to
  65         // make derivatives work correctly. They're usually turned on, but they
  66         // need to be masked off for GLSL-level stores. This bit seems to be the
  67         // only bit that's actually different between fragment shaders and other
  68         // shaders, so this is probably what it's doing.
  69         unsigned elide_writes : 1;
  70         // If backToBack is off:
  71         // - true for conditional branches and fallthrough
  72         // - false for unconditional branches
  73         // The blob seems to always set it to true if back-to-back is on.
  74         unsigned branch_cond : 1;
  75         // This bit is set when the next clause writes to the data register of some
  76         // previous clause.
  77         unsigned datareg_writebarrier: 1;
  78         unsigned datareg : 6;
  79         unsigned scoreboard_deps: 8;
  80         unsigned scoreboard_index: 3;
  81         enum bifrost_clause_type clause_type: 4;
  82         unsigned unk3 : 1; // part of clauseType?
  83         enum bifrost_clause_type next_clause_type: 4;
  84         unsigned unk4 : 1; // part of nextClauseType?
  85 } __attribute__((packed));
  86
  87 enum bifrost_packed_src {
  88         BIFROST_SRC_PORT0    = 0,
  89         BIFROST_SRC_PORT1    = 1,
  90         BIFROST_SRC_PORT3    = 2,
  91         BIFROST_SRC_STAGE    = 3,
  92         BIFROST_SRC_CONST_LO = 4,
  93         BIFROST_SRC_CONST_HI = 5,
  94         BIFROST_SRC_PASS_FMA = 6,
  95         BIFROST_SRC_PASS_ADD = 7,
  96 };
  97
  98 #define BIFROST_FMA_EXT (0xe0000)
  99 #define BIFROST_FMA_OP_MOV BIFROST_FMA_EXT | (0x32d)
 100 #define BIFROST_FMA_OP_FREXPE_LOG BIFROST_FMA_EXT | 0x3c5
 101 #define BIFROST_FMA_OP_ADD_FREXPM ((BIFROST_FMA_EXT | 0x1e80) >> 3)
 102 #define BIFROST_FMA_SEL_16(swiz) (((BIFROST_FMA_EXT | 0x1e00) >> 3) | (swiz))
 103
 104 struct bifrost_fma_inst {
 105         unsigned src0 : 3;
 106         unsigned op   : 20;
 107 } __attribute__((packed));
 108
 109 struct bifrost_fma_2src {
 110         unsigned src0 : 3;
 111         unsigned src1 : 3;
 112         unsigned op   : 17;
 113 } __attribute__((packed));
 114
 115 #define BIFROST_FMA_OP_SEL8 (0x71)
 116
 117 struct bifrost_fma_sel8 {
 118         unsigned src0 : 3;
 119         unsigned src1 : 3;
 120         unsigned src2 : 3;
 121         unsigned src3 : 3;
 122         unsigned swizzle : 4;
 123         unsigned op   : 7;
 124 } __attribute__((packed));
 125
 126 #define BIFROST_FMA_OP_MSCALE (0x50 >> 3)
 127
 128 struct bifrost_fma_mscale {
 129         unsigned src0 : 3;
 130         unsigned src1 : 3;
 131         unsigned src2 : 3;
 132         unsigned src3 : 3;
 133
 134         /* If mscale_mode is set - an MSCALE specific mode. If it is not set, a
 135          * regular outmod */
 136         unsigned mode : 2;
 137         unsigned mscale_mode : 1;
 138
 139         unsigned src0_abs : 1;
 140         unsigned src1_neg : 1;
 141         unsigned src2_neg : 1;
 142         unsigned op   : 5;
 143 } __attribute__((packed));
 144
 145 #define BIFROST_ADD_OP_BLEND (0x1952c)
 146 #define BIFROST_ADD_OP_FRCP_FAST_F32 (0x0cc00)
 147 #define BIFROST_ADD_OP_FRCP_FAST_F16_X (0x0ce10)
 148 #define BIFROST_ADD_OP_FRCP_FAST_F16_Y (0x0ce30)
 149 #define BIFROST_ADD_OP_FRSQ_FAST_F32 (0x0cc20)
 150 #define BIFROST_ADD_OP_FRSQ_FAST_F16_X (0x0ce50)
 151 #define BIFROST_ADD_OP_FRSQ_FAST_F16_Y (0x0ce70)
 152 #define BIFROST_ADD_OP_LOG2_HELP  (0x0cc68)
 153 #define BIFROST_ADD_OP_FEXP2_FAST (0x0cd58)
 154
 155 struct bifrost_add_inst {
 156         unsigned src0 : 3;
 157         unsigned op   : 17;
 158 } __attribute__((packed));
 159
 160 #define BIFROST_ADD_OP_LD_UBO_1 (0x0c1a0 >> 3)
 161 #define BIFROST_ADD_OP_LD_UBO_2 (0x0c1e0 >> 3)
 162 #define BIFROST_ADD_OP_LD_UBO_3 (0x0caa0 >> 3)
 163 #define BIFROST_ADD_OP_LD_UBO_4 (0x0c220 >> 3)
 164 #define BIFROST_ADD_SEL_16(swiz) ((0xea60 >> 3) | (swiz))
 165
 166 struct bifrost_add_2src {
 167         unsigned src0 : 3;
 168         unsigned src1 : 3;
 169         unsigned op   : 14;
 170 } __attribute__((packed));
 171
 172 #define BIFROST_ADD_OP_FMAX32 (0x00)
 173 #define BIFROST_ADD_OP_FMIN32 (0x01)
 174 #define BIFROST_ADD_OP_FADD32 (0x02)
 175
 176 #define BIFROST_ADD_OP_FADD16 (0x0A)
 177
 178 struct bifrost_add_faddmin {
 179         unsigned src0 : 3;
 180         unsigned src1 : 3;
 181         unsigned src1_abs : 1;
 182         unsigned src0_neg : 1;
 183         unsigned src1_neg : 1;
 184         unsigned select : 2; /* swizzle_0 for fp16 */
 185         unsigned outmod : 2; /* swizzle_1 for fp16 */
 186         unsigned mode : 2;
 187         unsigned src0_abs : 1;
 188         unsigned op   : 4;
 189 } __attribute__((packed));
 190
 191 #define BIFROST_ADD_OP_FMAX16 (0x10)
 192 #define BIFROST_ADD_OP_FMIN16 (0x12)
 193
 194 struct bifrost_add_fmin16 {
 195         unsigned src0 : 3;
 196         unsigned src1 : 3;
 197         /* abs2 inferred as with FMA */
 198         unsigned abs1 : 1;
 199         unsigned src0_neg : 1;
 200         unsigned src1_neg : 1;
 201         unsigned src0_swizzle : 2;
 202         unsigned src1_swizzle : 2;
 203         unsigned mode : 2;
 204         unsigned op : 5;
 205 } __attribute__((packed));
 206
 207 #define BIFROST_ADD_OP_ST_VAR (0x19300 >> 8)
 208
 209 struct bifrost_st_vary {
 210         unsigned src0 : 3;
 211         unsigned src1 : 3;
 212         unsigned src2 : 3;
 213         unsigned channels : 2;
 214         unsigned op   : 9;
 215 } __attribute__((packed));
 216
 217 #define BIFROST_ADD_OP_ATEST (0xc8f)
 218
 219 struct bifrost_add_atest {
 220         /* gl_SampleMask (R60) */
 221         unsigned src0 : 3;
 222
 223         /* Alpha value */
 224         unsigned src1 : 3;
 225
 226         /* If half, X/Y select. If !half, always set */
 227         unsigned component : 1;
 228         unsigned half : 1;
 229
 230         unsigned op   : 12;
 231 } __attribute__((packed));
 232
 233 enum bifrost_outmod {
 234         BIFROST_NONE = 0x0,
 235         BIFROST_POS = 0x1,
 236         BIFROST_SAT_SIGNED = 0x2,
 237         BIFROST_SAT = 0x3,
 238 };
 239
 240 enum bifrost_roundmode {
 241         BIFROST_RTE = 0x0, /* round to even */
 242         BIFROST_RTP = 0x1, /* round to positive */
 243         BIFROST_RTN = 0x2, /* round to negative */
 244         BIFROST_RTZ = 0x3 /* round to zero */
 245 };
 246
 247 /* NONE: Same as fmax() and fmin() -- return the other
 248  * number if any number is NaN.  Also always return +0 if
 249  * one argument is +0 and the other is -0.
 250  *
 251  * NAN_WINS: Instead of never returning a NaN, always return
 252  * one. The "greater"/"lesser" NaN is always returned, first
 253  * by checking the sign and then the mantissa bits.
 254  *
 255  * SRC1_WINS: For max, implement src0 > src1 ? src0 : src1.
 256  * For min, implement src0 < src1 ? src0 : src1.  This
 257  * includes handling NaN's and signedness of 0 differently
 258  * from above, since +0 and -0 compare equal and comparisons
 259  * always return false for NaN's. As a result, this mode is
 260  * *not* commutative.
 261  *
 262  * SRC0_WINS: For max, implement src0 < src1 ? src1 : src0
 263  * For min, implement src0 > src1 ? src1 : src0
 264  */
 265
 266
 267 enum bifrost_minmax_mode {
 268         BIFROST_MINMAX_NONE = 0x0,
 269         BIFROST_NAN_WINS    = 0x1,
 270         BIFROST_SRC1_WINS   = 0x2,
 271         BIFROST_SRC0_WINS   = 0x3,
 272 };
 273
 274 #define BIFROST_FMA_OP_FADD32 (0x58 >> 2)
 275 #define BIFROST_FMA_OP_FMAX32 (0x40 >> 2)
 276 #define BIFROST_FMA_OP_FMIN32 (0x44 >> 2)
 277
 278 struct bifrost_fma_add {
 279         unsigned src0 : 3;
 280         unsigned src1 : 3;
 281         unsigned src1_abs : 1;
 282         unsigned src0_neg : 1;
 283         unsigned src1_neg : 1;
 284         unsigned unk : 3;
 285         unsigned src0_abs : 1;
 286         enum bifrost_roundmode roundmode : 2;
 287         enum bifrost_outmod outmod : 2;
 288         unsigned op : 6;
 289 } __attribute__((packed));
 290
 291 #define BIFROST_FMA_OP_FMAX16 (0xC0 >> 2)
 292 #define BIFROST_FMA_OP_FMIN16 (0xCC >> 2)
 293 #define BIFROST_FMA_OP_FADD16 (0xD8 >> 2)
 294
 295 struct bifrost_fma_add_minmax16 {
 296         unsigned src0 : 3;
 297         unsigned src1 : 3;
 298         /* abs2 inferred as (src1 < src0) */
 299         unsigned abs1 : 1;
 300         unsigned src0_neg : 1;
 301         unsigned src1_neg : 1;
 302         unsigned src0_swizzle : 2;
 303         unsigned src1_swizzle : 2;
 304         unsigned mode : 2;
 305         enum bifrost_outmod outmod : 2;
 306         /* roundmode for add, min/max mode for min/max */
 307         unsigned op : 6;
 308 } __attribute__((packed));
 309
 310 #define BIFROST_FMA_OP_FMA (0x00)
 311
 312 struct bifrost_fma_fma {
 313         unsigned src0 : 3;
 314         unsigned src1 : 3;
 315         unsigned src2 : 3;
 316         unsigned src_expand : 3;
 317         unsigned src0_abs : 1;
 318         enum bifrost_roundmode roundmode : 2;
 319         enum bifrost_outmod outmod : 2;
 320         unsigned src0_neg : 1; /* 14 */
 321         unsigned src2_neg : 1;
 322         unsigned src1_abs : 1;
 323         unsigned src2_abs : 1; /* 17 */
 324         unsigned op : 2;
 325 } __attribute__((packed));
 326
 327 #define BIFROST_FMA_OP_FMA16 (0x2)
 328
 329 struct bifrost_fma_fma16 {
 330         unsigned src0 : 3;
 331         unsigned src1 : 3;
 332         unsigned src2 : 3;
 333         unsigned swizzle_0 : 2;
 334         unsigned swizzle_1 : 2;
 335         enum bifrost_roundmode roundmode : 2;
 336         enum bifrost_outmod outmod : 2;
 337         unsigned src0_neg : 1;
 338         unsigned src2_neg : 1;
 339         unsigned swizzle_2 : 2;
 340         unsigned op : 2;
 341 } __attribute__((packed));
 342
 343 enum bifrost_csel_cond {
 344         BIFROST_FEQ_F = 0x0,
 345         BIFROST_FGT_F = 0x1,
 346         BIFROST_FGE_F = 0x2,
 347         BIFROST_IEQ_F = 0x3,
 348         BIFROST_IGT_I = 0x4,
 349         BIFROST_IGE_I = 0x5,
 350         BIFROST_UGT_I = 0x6,
 351         BIFROST_UGE_I = 0x7
 352 };
 353
 354 #define BIFROST_FMA_OP_CSEL4     (0x5c)
 355 #define BIFROST_FMA_OP_CSEL4_V16 (0xdc)
 356
 357 struct bifrost_csel4 {
 358         unsigned src0 : 3;
 359         unsigned src1 : 3;
 360         unsigned src2 : 3;
 361         unsigned src3 : 3;
 362         enum bifrost_csel_cond cond : 3;
 363         unsigned op   : 8;
 364 } __attribute__((packed));
 365
 366 struct bifrost_shift_fma {
 367         unsigned src0 : 3;
 368         unsigned src1 : 3;
 369         unsigned src2 : 3;
 370         unsigned half : 3; /* 000 for i32, 100 for i8, 111 for v2i16 */
 371         unsigned unk  : 1; /* always set? */
 372         unsigned invert_1 : 1; /* Inverts sources to combining op */
 373         /* For XOR, switches RSHIFT to LSHIFT since only one invert needed */
 374         unsigned invert_2 : 1;
 375         unsigned op : 8;
 376 } __attribute__((packed));
 377
 378 struct bifrost_shift_add {
 379         unsigned src0 : 3;
 380         unsigned src1 : 3;
 381         unsigned src2 : 3;
 382         unsigned zero : 2;
 383
 384         unsigned invert_1 : 1;
 385         unsigned invert_2 : 1;
 386
 387         unsigned op : 7;
 388 } __attribute__((packed));
 389
 390 /* Two sources for vectorization */
 391 #define BIFROST_FMA_FLOAT32_TO_16 (0xdd000 >> 3)
 392 #define BIFROST_ADD_FLOAT32_TO_16 (0x0EC00 >> 3)
 393
 394 enum bifrost_convert_mode {
 395         BIFROST_CONV_UNK0 = 0,
 396         BIFROST_CONV_F32_TO_I32 = 1,
 397         BIFROST_CONV_F16_TO_I16 = 2,
 398         BIFROST_CONV_I32_TO_F32 = 3,
 399         BIFROST_CONV_I16_TO_X32 = 4,
 400         BIFROST_CONV_F16_TO_F32 = 5,
 401         BIFROST_CONV_I16_TO_F16 = 6,
 402         BIFROST_CONV_UNK7 = 7
 403 };
 404
 405 /* i16 to x32 */
 406 #define BIFROST_CONVERT_4(is_unsigned, component, to_float) \
 407         ((is_unsigned & 1) | ((component & 1) << 1) | ((to_float & 1) << 2) | \
 408          ((0x3) << 3) | ((4) << 5) | 0x100)
 409
 410 /* f16 to f32 */
 411 #define BIFROST_CONVERT_5(component) \
 412         ((component & 1) | ((1) << 1) | ((5) << 5) | 0x100)
 413
 414 /* Other conversions */
 415 #define BIFROST_CONVERT(is_unsigned, roundmode, swizzle, mode) \
 416         ((is_unsigned & 1) | ((roundmode & 3) << 1) | ((swizzle & 3) << 3) | ((mode & 7) << 5))
 417
 418 #define BIFROST_FMA_CONVERT (0xe0000)
 419 #define BIFROST_ADD_CONVERT (0x07800)
 420
 421 enum bifrost_ldst_type {
 422         BIFROST_LDST_F16 = 0,
 423         BIFROST_LDST_F32 = 1,
 424         BIFROST_LDST_I32 = 2,
 425         BIFROST_LDST_U32 = 3
 426 };
 427
 428 #define BIFROST_ADD_OP_LD_VAR_ADDR (0x18000 >> 10)
 429
 430 struct bifrost_ld_var_addr {
 431         unsigned src0 : 3;
 432         unsigned src1 : 3;
 433         unsigned location : 5;
 434         enum bifrost_ldst_type type : 2;
 435         unsigned op : 7;
 436 } __attribute__((packed));
 437
 438 #define BIFROST_ADD_OP_LD_ATTR (0x08000 >> 12)
 439
 440 struct bifrost_ld_attr {
 441         unsigned src0 : 3;
 442         unsigned src1 : 3;
 443         unsigned location : 5;
 444         unsigned channels : 2; /* MALI_POSITIVE */
 445         enum bifrost_ldst_type type : 2;
 446         unsigned op : 5;
 447 } __attribute__((packed));
 448
 449 enum bifrost_interp_mode {
 450         BIFROST_INTERP_PER_FRAG = 0x0,
 451         BIFROST_INTERP_CENTROID = 0x1,
 452         BIFROST_INTERP_DEFAULT  = 0x2,
 453         BIFROST_INTERP_EXPLICIT = 0x3
 454 };
 455
 456 #define BIFROST_ADD_OP_LD_VAR_16 (0x1a << 1)
 457 #define BIFROST_ADD_OP_LD_VAR_32 (0x0a << 1)
 458
 459 struct bifrost_ld_var {
 460         unsigned src0 : 3;
 461
 462         /* If top two bits set, indirect with src in bottom three */
 463         unsigned addr : 5;
 464
 465         unsigned channels : 2; /* MALI_POSITIVE */
 466         enum bifrost_interp_mode interp_mode : 2;
 467         unsigned reuse : 1;
 468         unsigned flat : 1;
 469         unsigned op : 6;
 470 } __attribute__((packed));
 471
 472 struct bifrost_tex_ctrl {
 473         unsigned sampler_index : 4; // also used to signal indirects
 474         unsigned tex_index : 7;
 475         bool no_merge_index : 1; // whether to merge (direct) sampler & texture indices
 476         bool filter : 1; // use the usual filtering pipeline (0 for texelFetch & textureGather)
 477         unsigned unk0 : 2;
 478         bool texel_offset : 1; // *Offset()
 479         bool is_shadow : 1;
 480         bool is_array : 1;
 481         unsigned tex_type : 2; // 2D, 3D, Cube, Buffer
 482         bool compute_lod : 1; // 0 for *Lod()
 483         bool not_supply_lod : 1; // 0 for *Lod() or when a bias is applied
 484         bool calc_gradients : 1; // 0 for *Grad()
 485         unsigned unk1 : 1;
 486         unsigned result_type : 4; // integer, unsigned, float TODO: why is this 4 bits?
 487         unsigned unk2 : 4;
 488 } __attribute__((packed));
 489
 490 struct bifrost_dual_tex_ctrl {
 491         unsigned sampler_index0 : 2;
 492         unsigned unk0 : 2;
 493         unsigned tex_index0 : 2;
 494         unsigned sampler_index1 : 2;
 495         unsigned tex_index1 : 2;
 496         unsigned unk1 : 22;
 497 } __attribute__((packed));
 498
 499 #define BIFROST_ADD_OP_TEX_COMPACT_F32 (0x0b000 >> 10)
 500 #define BIFROST_ADD_OP_TEX_COMPACT_F16 (0x1b000 >> 10)
 501
 502 struct bifrost_tex_compact {
 503         unsigned src0 : 3;
 504         unsigned src1 : 3;
 505         unsigned tex_index : 3;
 506         unsigned unknown : 1;
 507         unsigned sampler_index : 3;
 508         unsigned op   : 7;
 509 } __attribute__((packed));
 510
 511 enum branch_bit_size {
 512         BR_SIZE_32 = 0,
 513         BR_SIZE_16XX = 1,
 514         BR_SIZE_16YY = 2,
 515         // For the above combinations of bitsize and location, an extra bit is
 516         // encoded via comparing the sources. The only possible source of ambiguity
 517         // would be if the sources were the same, but then the branch condition
 518         // would be always true or always false anyways, so we can ignore it. But
 519         // this no longer works when comparing the y component to the x component,
 520         // since it's valid to compare the y component of a source against its own
 521         // x component. Instead, the extra bit is encoded via an extra bitsize.
 522         BR_SIZE_16YX0 = 3,
 523         BR_SIZE_16YX1 = 4,
 524         BR_SIZE_32_AND_16X = 5,
 525         BR_SIZE_32_AND_16Y = 6,
 526         // Used for comparisons with zero and always-true, see below. I think this
 527         // only works for integer comparisons.
 528         BR_SIZE_ZERO = 7,
 529 };
 530
 531 enum bifrost_reg_write_unit {
 532         REG_WRITE_NONE = 0, // don't write
 533         REG_WRITE_TWO, // write using reg2
 534         REG_WRITE_THREE, // write using reg3
 535 };
 536
 537 struct bifrost_regs {
 538         unsigned uniform_const : 8;
 539         unsigned reg2 : 6;
 540         unsigned reg3 : 6;
 541         unsigned reg0 : 5;
 542         unsigned reg1 : 6;
 543         unsigned ctrl : 4;
 544 } __attribute__((packed));
 545
 546 enum bifrost_branch_cond {
 547         BR_COND_LT = 0,
 548         BR_COND_LE = 1,
 549         BR_COND_GE = 2,
 550         BR_COND_GT = 3,
 551         // Equal vs. not-equal determined by src0/src1 comparison
 552         BR_COND_EQ = 4,
 553         // floating-point comparisons
 554         // Becomes UNE when you flip the arguments
 555         BR_COND_OEQ = 5,
 556         // TODO what happens when you flip the arguments?
 557         BR_COND_OGT = 6,
 558         BR_COND_OLT = 7,
 559 };
 560
 561 enum bifrost_branch_code {
 562         BR_ALWAYS = 63,
 563 };
 564
 565 struct bifrost_branch {
 566         unsigned src0 : 3;
 567
 568         /* For BR_SIZE_ZERO, upper two bits become ctrl */
 569         unsigned src1 : 3;
 570
 571         /* Offset source -- always uniform/const but
 572          * theoretically could support indirect jumps? */
 573         unsigned src2 : 3;
 574
 575         enum bifrost_branch_cond cond : 3;
 576         enum branch_bit_size size : 3;
 577
 578         unsigned op : 5;
 579 };
 580
 581 /* Clause packing */
 582
 583 #define BIFROST_FMA_NOP (0x701960 | BIFROST_SRC_STAGE)
 584 #define BIFROST_ADD_NOP (0x3D960 | BIFROST_SRC_STAGE)
 585
 586 struct bifrost_fmt1 {
 587         unsigned ins_0 : 3;
 588         unsigned tag : 5;
 589         uint64_t ins_1 : 64;
 590         unsigned ins_2 : 11;
 591         uint64_t header : 45;
 592 } __attribute__((packed));
 593
 594 #define BIFROST_FMT1_INSTRUCTIONS    0b00101
 595 #define BIFROST_FMT1_FINAL           0b01001
 596 #define BIFROST_FMT1_CONSTANTS       0b00001
 597
 598 #define BIFROST_FMTC_CONSTANTS       0b0011
 599 #define BIFROST_FMTC_FINAL           0b0111
 600
 601 struct bifrost_fmt_constant {
 602         unsigned pos : 4;
 603         unsigned tag : 4;
 604         uint64_t imm_1 : 60;
 605         uint64_t imm_2 : 60;
 606 } __attribute__((packed));
 607
 608 enum bifrost_reg_control {
 609         BIFROST_WRITE_FMA_P2         = 1,
 610         BIFROST_WRITE_FMA_P2_READ_P3 = 2,
 611         BIFROST_FIRST_WRITE_FMA_P2_READ_P3 = 3,
 612         BIFROST_READ_P3              = 4,
 613         BIFROST_WRITE_ADD_P2         = 5,
 614         BIFROST_WRITE_ADD_P2_READ_P3 = 6,
 615         BIFROST_WRITE_ADD_P2_FMA_P3  = 7,
 616
 617         BIFROST_FIRST_NONE           = 8,
 618         BIFROST_FIRST_WRITE_FMA_P2   = 9,
 619         /* INSTR_INVALID_ENC */
 620         BIFROST_REG_NONE             = 11,
 621         BIFROST_FIRST_READ_P3        = 12,
 622         BIFROST_FIRST_WRITE_ADD_P2   = 13,
 623         BIFROST_FIRST_WRITE_ADD_P2_READ_P3 = 14,
 624         BIFROST_FIRST_WRITE_ADD_P2_FMA_P3  = 15
 625 };
 626
 627 #endif