/* * Copyright (C) 2019 Connor Abbott * Copyright (C) 2019 Lyude Paul * Copyright (C) 2019 Ryan Houdek * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #ifndef __bifrost_h__ #define __bifrost_h__ #include #include #define BIFROST_DBG_MSGS 0x0001 #define BIFROST_DBG_SHADERS 0x0002 extern int bifrost_debug; enum bifrost_clause_type { BIFROST_CLAUSE_NONE = 0, BIFROST_CLAUSE_LOAD_VARY = 1, BIFROST_CLAUSE_UBO = 2, BIFROST_CLAUSE_TEX = 3, BIFROST_CLAUSE_SSBO_LOAD = 5, BIFROST_CLAUSE_SSBO_STORE = 6, BIFROST_CLAUSE_BLEND = 9, BIFROST_CLAUSE_FRAGZ = 12, BIFROST_CLAUSE_ATEST = 13, BIFROST_CLAUSE_64BIT = 15 }; struct bifrost_header { unsigned unk0 : 7; // If true, convert any infinite result of any floating-point operation to // the biggest representable number. unsigned suppress_inf: 1; // Convert any NaN results to 0. unsigned suppress_nan : 1; unsigned unk1 : 2; // true if the execution mask of the next clause is the same as the mask of // the current clause. unsigned back_to_back : 1; unsigned no_end_of_shader: 1; unsigned unk2 : 2; // Set to true for fragment shaders, to implement this bit of spec text // from section 7.1.5 of the GLSL ES spec: // // "Stores to image and buffer variables performed by helper invocations // have no effect on the underlying image or buffer memory." // // Helper invocations are threads (invocations) corresponding to pixels in // a quad that aren't actually part of the triangle, but are included to // make derivatives work correctly. They're usually turned on, but they // need to be masked off for GLSL-level stores. This bit seems to be the // only bit that's actually different between fragment shaders and other // shaders, so this is probably what it's doing. unsigned elide_writes : 1; // If backToBack is off: // - true for conditional branches and fallthrough // - false for unconditional branches // The blob seems to always set it to true if back-to-back is on. unsigned branch_cond : 1; // This bit is set when the next clause writes to the data register of some // previous clause. unsigned datareg_writebarrier: 1; unsigned datareg : 6; unsigned scoreboard_deps: 8; unsigned scoreboard_index: 3; enum bifrost_clause_type clause_type: 4; unsigned unk3 : 1; // part of clauseType? enum bifrost_clause_type next_clause_type: 4; unsigned unk4 : 1; // part of nextClauseType? } __attribute__((packed)); enum bifrost_packed_src { BIFROST_SRC_PORT0 = 0, BIFROST_SRC_PORT1 = 1, BIFROST_SRC_PORT3 = 2, BIFROST_SRC_STAGE = 3, BIFROST_SRC_CONST_LO = 4, BIFROST_SRC_CONST_HI = 5, BIFROST_SRC_PASS_FMA = 6, BIFROST_SRC_PASS_ADD = 7, }; #define BIFROST_FMA_EXT (0xe0000) #define BIFROST_FMA_OP_MOV BIFROST_FMA_EXT | (0x32d) #define BIFROST_FMA_OP_FREXPE_LOG BIFROST_FMA_EXT | 0x3c5 #define BIFROST_FMA_OP_ADD_FREXPM ((BIFROST_FMA_EXT | 0x1e80) >> 3) #define BIFROST_FMA_SEL_16(swiz) (((BIFROST_FMA_EXT | 0x1e00) >> 3) | (swiz)) #define BIFROST_FMA_ROUND_16(mode, swiz) (BIFROST_FMA_EXT | 0x1800 | (swiz) | ((mode) << 6)) #define BIFROST_FMA_ROUND_32(mode) (BIFROST_FMA_EXT | 0x1805 | ((mode) << 6)) struct bifrost_fma_inst { unsigned src0 : 3; unsigned op : 20; } __attribute__((packed)); #define BIFROST_FMA_IADD_32 (0x4ff98 >> 3) #define BIFROST_FMA_ISUB_32 (0x4ffd8 >> 3) struct bifrost_fma_2src { unsigned src0 : 3; unsigned src1 : 3; unsigned op : 17; } __attribute__((packed)); #define BIFROST_FMA_OP_SEL8 (0x71) struct bifrost_fma_sel8 { unsigned src0 : 3; unsigned src1 : 3; unsigned src2 : 3; unsigned src3 : 3; unsigned swizzle : 4; unsigned op : 7; } __attribute__((packed)); #define BIFROST_FMA_OP_MSCALE (0x50 >> 3) struct bifrost_fma_mscale { unsigned src0 : 3; unsigned src1 : 3; unsigned src2 : 3; unsigned src3 : 3; /* If mscale_mode is set - an MSCALE specific mode. If it is not set, a * regular outmod */ unsigned mode : 2; unsigned mscale_mode : 1; unsigned src0_abs : 1; unsigned src1_neg : 1; unsigned src2_neg : 1; unsigned op : 5; } __attribute__((packed)); #define BIFROST_ADD_OP_BLEND (0x1952c) #define BIFROST_ADD_OP_FRCP_FAST_F32 (0x0cc00) #define BIFROST_ADD_OP_FRCP_FAST_F16_X (0x0ce10) #define BIFROST_ADD_OP_FRCP_FAST_F16_Y (0x0ce30) #define BIFROST_ADD_OP_FRSQ_FAST_F32 (0x0cc20) #define BIFROST_ADD_OP_FRSQ_FAST_F16_X (0x0ce50) #define BIFROST_ADD_OP_FRSQ_FAST_F16_Y (0x0ce70) #define BIFROST_ADD_OP_LOG2_HELP (0x0cc68) #define BIFROST_ADD_OP_FEXP2_FAST (0x0cd58) struct bifrost_add_inst { unsigned src0 : 3; unsigned op : 17; } __attribute__((packed)); #define BIFROST_ADD_OP_DISCARD (0x19100 >> 8) enum bifrost_discard_cond { BIFROST_DISCARD_FEQ = 0, BIFROST_DISCARD_FNE = 1, BIFROST_DISCARD_FLE = 2, BIFROST_DISCARD_FLT = 3, }; struct bifrost_add_discard { unsigned src0 : 3; unsigned src1 : 3; enum bifrost_discard_cond cond : 2; /* Zero for fp32 */ unsigned src0_select : 1; unsigned src1_select : 1; unsigned fp32 : 1; unsigned op : 9; } __attribute__((packed)); #define BIFROST_ADD_OP_LD_UBO_1 (0x0c1a0 >> 3) #define BIFROST_ADD_OP_LD_UBO_2 (0x0c1e0 >> 3) #define BIFROST_ADD_OP_LD_UBO_3 (0x0caa0 >> 3) #define BIFROST_ADD_OP_LD_UBO_4 (0x0c220 >> 3) #define BIFROST_ADD_SEL_16(swiz) ((0xea60 >> 3) | (swiz)) #define BIFROST_ADD_IADD_8 (0x17880 >> 3) #define BIFROST_ADD_IADD_16 (0x17900 >> 3) #define BIFROST_ADD_IADD_32 (0x178c0 >> 3) #define BIFROST_ADD_ISUB_8 (0x17a80 >> 3) #define BIFROST_ADD_ISUB_16 (0x17b00 >> 3) #define BIFROST_ADD_ISUB_32 (0x17ac0 >> 3) struct bifrost_add_2src { unsigned src0 : 3; unsigned src1 : 3; unsigned op : 14; } __attribute__((packed)); #define BIFROST_ADD_OP_FMAX32 (0x00) #define BIFROST_ADD_OP_FMIN32 (0x01) #define BIFROST_ADD_OP_FADD32 (0x02) #define BIFROST_ADD_OP_FADD16 (0x0A) struct bifrost_add_faddmin { unsigned src0 : 3; unsigned src1 : 3; unsigned src1_abs : 1; unsigned src0_neg : 1; unsigned src1_neg : 1; unsigned select : 2; /* swizzle_0 for fp16 */ unsigned outmod : 2; /* swizzle_1 for fp16 */ unsigned mode : 2; unsigned src0_abs : 1; unsigned op : 4; } __attribute__((packed)); #define BIFROST_ADD_OP_FMAX16 (0x10) #define BIFROST_ADD_OP_FMIN16 (0x12) struct bifrost_add_fmin16 { unsigned src0 : 3; unsigned src1 : 3; /* abs2 inferred as with FMA */ unsigned abs1 : 1; unsigned src0_neg : 1; unsigned src1_neg : 1; unsigned src0_swizzle : 2; unsigned src1_swizzle : 2; unsigned mode : 2; unsigned op : 5; } __attribute__((packed)); #define BIFROST_ADD_OP_ST_VAR (0x19300 >> 8) struct bifrost_st_vary { unsigned src0 : 3; unsigned src1 : 3; unsigned src2 : 3; unsigned channels : 2; unsigned op : 9; } __attribute__((packed)); #define BIFROST_ADD_OP_ATEST (0xc8f) struct bifrost_add_atest { /* gl_SampleMask (R60) */ unsigned src0 : 3; /* Alpha value */ unsigned src1 : 3; /* If half, X/Y select. If !half, always set */ unsigned component : 1; unsigned half : 1; unsigned op : 12; } __attribute__((packed)); enum bifrost_outmod { BIFROST_NONE = 0x0, BIFROST_POS = 0x1, BIFROST_SAT_SIGNED = 0x2, BIFROST_SAT = 0x3, }; enum bifrost_roundmode { BIFROST_RTE = 0x0, /* round to even */ BIFROST_RTP = 0x1, /* round to positive */ BIFROST_RTN = 0x2, /* round to negative */ BIFROST_RTZ = 0x3 /* round to zero */ }; /* NONE: Same as fmax() and fmin() -- return the other * number if any number is NaN. Also always return +0 if * one argument is +0 and the other is -0. * * NAN_WINS: Instead of never returning a NaN, always return * one. The "greater"/"lesser" NaN is always returned, first * by checking the sign and then the mantissa bits. * * SRC1_WINS: For max, implement src0 > src1 ? src0 : src1. * For min, implement src0 < src1 ? src0 : src1. This * includes handling NaN's and signedness of 0 differently * from above, since +0 and -0 compare equal and comparisons * always return false for NaN's. As a result, this mode is * *not* commutative. * * SRC0_WINS: For max, implement src0 < src1 ? src1 : src0 * For min, implement src0 > src1 ? src1 : src0 */ enum bifrost_minmax_mode { BIFROST_MINMAX_NONE = 0x0, BIFROST_NAN_WINS = 0x1, BIFROST_SRC1_WINS = 0x2, BIFROST_SRC0_WINS = 0x3, }; #define BIFROST_FMA_OP_FADD32 (0x58 >> 2) #define BIFROST_FMA_OP_FMAX32 (0x40 >> 2) #define BIFROST_FMA_OP_FMIN32 (0x44 >> 2) struct bifrost_fma_add { unsigned src0 : 3; unsigned src1 : 3; unsigned src1_abs : 1; unsigned src0_neg : 1; unsigned src1_neg : 1; unsigned unk : 3; unsigned src0_abs : 1; enum bifrost_roundmode roundmode : 2; enum bifrost_outmod outmod : 2; unsigned op : 6; } __attribute__((packed)); #define BIFROST_FMA_OP_FMAX16 (0xC0 >> 2) #define BIFROST_FMA_OP_FMIN16 (0xCC >> 2) #define BIFROST_FMA_OP_FADD16 (0xD8 >> 2) struct bifrost_fma_add_minmax16 { unsigned src0 : 3; unsigned src1 : 3; /* abs2 inferred as (src1 < src0) */ unsigned abs1 : 1; unsigned src0_neg : 1; unsigned src1_neg : 1; unsigned src0_swizzle : 2; unsigned src1_swizzle : 2; unsigned mode : 2; enum bifrost_outmod outmod : 2; /* roundmode for add, min/max mode for min/max */ unsigned op : 6; } __attribute__((packed)); #define BIFROST_FMA_OP_FMA (0x00) struct bifrost_fma_fma { unsigned src0 : 3; unsigned src1 : 3; unsigned src2 : 3; unsigned src_expand : 3; unsigned src0_abs : 1; enum bifrost_roundmode roundmode : 2; enum bifrost_outmod outmod : 2; unsigned src0_neg : 1; /* 14 */ unsigned src2_neg : 1; unsigned src1_abs : 1; unsigned src2_abs : 1; /* 17 */ unsigned op : 2; } __attribute__((packed)); #define BIFROST_FMA_OP_FMA16 (0x2) struct bifrost_fma_fma16 { unsigned src0 : 3; unsigned src1 : 3; unsigned src2 : 3; unsigned swizzle_0 : 2; unsigned swizzle_1 : 2; enum bifrost_roundmode roundmode : 2; enum bifrost_outmod outmod : 2; unsigned src0_neg : 1; unsigned src2_neg : 1; unsigned swizzle_2 : 2; unsigned op : 2; } __attribute__((packed)); enum bifrost_csel_cond { BIFROST_FEQ_F = 0x0, BIFROST_FGT_F = 0x1, BIFROST_FGE_F = 0x2, BIFROST_IEQ_F = 0x3, BIFROST_IGT_I = 0x4, BIFROST_IGE_I = 0x5, BIFROST_UGT_I = 0x6, BIFROST_UGE_I = 0x7 }; #define BIFROST_FMA_OP_CSEL4 (0x5c) #define BIFROST_FMA_OP_CSEL4_V16 (0xdc) struct bifrost_csel4 { unsigned src0 : 3; unsigned src1 : 3; unsigned src2 : 3; unsigned src3 : 3; enum bifrost_csel_cond cond : 3; unsigned op : 8; } __attribute__((packed)); #define BIFROST_FMA_OP_RSHIFT_NAND (0x60000 >> 12) #define BIFROST_FMA_OP_RSHIFT_AND (0x61000 >> 12) #define BIFROST_FMA_OP_LSHIFT_NAND (0x62000 >> 12) #define BIFROST_FMA_OP_LSHIFT_AND (0x63000 >> 12) #define BIFROST_FMA_OP_RSHIFT_XOR (0x64000 >> 12) #define BIFROST_FMA_OP_LSHIFT_ADD_32 (0x65200 >> 6) #define BIFROST_FMA_OP_LSHIFT_SUB_32 (0x65600 >> 6) #define BIFROST_FMA_OP_LSHIFT_RSUB_32 (0x65a00 >> 6) #define BIFROST_FMA_OP_RSHIFT_ADD_32 (0x65e00 >> 6) #define BIFROST_FMA_OP_RSHIFT_SUB_32 (0x66200 >> 6) #define BIFROST_FMA_OP_RSHIFT_RSUB_32 (0x66600 >> 6) struct bifrost_shift_fma { unsigned src0 : 3; unsigned src1 : 3; unsigned src2 : 3; unsigned half : 3; unsigned unk : 1; /* always set? */ unsigned invert_1 : 1; /* Inverts sources to combining op */ /* For XOR, switches RSHIFT to LSHIFT since only one invert needed */ unsigned invert_2 : 1; unsigned op : 8; } __attribute__((packed)); struct bifrost_shift_add { unsigned src0 : 3; unsigned src1 : 3; unsigned src2 : 3; unsigned zero : 2; unsigned invert_1 : 1; unsigned invert_2 : 1; unsigned op : 7; } __attribute__((packed)); enum bifrost_fcmp_cond { BIFROST_OEQ = 0, BIFROST_OGT = 1, BIFROST_OGE = 2, BIFROST_UNE = 3, BIFROST_OLT = 4, BIFROST_OLE = 5, }; #define BIFROST_FMA_OP_FCMP_GL (0x48000 >> 13) #define BIFROST_FMA_OP_FCMP_D3D (0x4c000 >> 13) struct bifrost_fma_fcmp { unsigned src0 : 3; unsigned src1 : 3; unsigned src1_abs : 1; unsigned unk1 : 1; unsigned src1_neg : 1; unsigned src_expand : 3; unsigned src0_abs : 1; enum bifrost_fcmp_cond cond : 3; unsigned op : 7; } __attribute__((packed)); struct bifrost_add_fcmp { unsigned src0 : 3; unsigned src1 : 3; enum bifrost_fcmp_cond cond : 3; unsigned src_expand : 2; unsigned src0_abs : 1; unsigned src1_abs : 1; unsigned src1_neg : 1; unsigned op : 6; } __attribute__((packed)); #define BIFROST_FMA_OP_FCMP_GL_16 (0xc8000 >> 13) #define BIFROST_FMA_OP_FCMP_D3D_16 (0xcc000 >> 13) struct bifrost_fma_fcmp16 { unsigned src0 : 3; unsigned src1 : 3; /* abs2 inferred */ unsigned abs1 : 1; unsigned unk : 2; unsigned src0_swizzle : 2; unsigned src1_swizzle : 2; enum bifrost_fcmp_cond cond : 3; unsigned op : 7; } __attribute__((packed)); struct bifrost_add_fcmp16 { unsigned src0 : 3; unsigned src1 : 3; enum bifrost_fcmp_cond cond : 3; unsigned src0_swizzle : 2; unsigned src1_swizzle : 2; /* No abs mods */ unsigned src0_neg : 1; unsigned op : 6; } __attribute__((packed)); enum bifrost_icmp_cond { BIFROST_ICMP_IGT = 0, BIFROST_ICMP_IGE = 1, /* swapped for 16-bit */ BIFROST_ICMP_UGT = 2, /* swapped for 16-bit */ BIFROST_ICMP_UGE = 3, BIFROST_ICMP_EQ = 4, BIFROST_ICMP_NEQ = 5, BIFROST_ICMP_32_OR_8 = 6, /* nested */ BIFROST_ICMP_64 = 7, /* nested */ }; struct bifrost_fma_icmp32 { unsigned src0 : 3; unsigned src1 : 3; enum bifrost_icmp_cond cond : 3; unsigned unk1 : 1; /* set */ unsigned d3d : 1; unsigned op : 12; } __attribute__((packed)); struct bifrost_fma_icmp16 { unsigned src0 : 3; unsigned src1 : 3; unsigned unk : 5; /* 11010 */ enum bifrost_icmp_cond cond : 3; unsigned op : 9; } __attribute__((packed)); #define BIFROST_ADD_OP_ICMP_32 (0x0f600 >> 8) #define BIFROST_ADD_OP_ICMP_16 (0x0f000 >> 11) struct bifrost_add_icmp { unsigned src0 : 3; unsigned src1 : 3; enum bifrost_icmp_cond cond : 3; unsigned sz : 1; /* 1 for 32, 0 for 8 */ unsigned d3d : 1; unsigned op : 9; } __attribute__((packed)); struct bifrost_add_icmp16 { unsigned src0 : 3; unsigned src1 : 3; unsigned src0_swizzle : 2; unsigned src1_swizzle : 2; unsigned d3d : 1; enum bifrost_icmp_cond cond : 3; unsigned op : 6; } __attribute__((packed)); /* Two sources for vectorization */ #define BIFROST_FMA_FLOAT32_TO_16 (0xdd000 >> 3) #define BIFROST_ADD_FLOAT32_TO_16 (0x0EC00 >> 3) enum bifrost_convert_mode { BIFROST_CONV_UNK0 = 0, BIFROST_CONV_F32_TO_I32 = 1, BIFROST_CONV_F16_TO_I16 = 2, BIFROST_CONV_I32_TO_F32 = 3, BIFROST_CONV_I16_TO_X32 = 4, BIFROST_CONV_F16_TO_F32 = 5, BIFROST_CONV_I16_TO_F16 = 6, BIFROST_CONV_UNK7 = 7 }; /* i16 to x32 */ #define BIFROST_CONVERT_4(is_unsigned, component, to_float) \ ((is_unsigned & 1) | ((component & 1) << 1) | ((to_float & 1) << 2) | \ ((0x3) << 3) | ((4) << 5) | 0x100) /* f16 to f32 */ #define BIFROST_CONVERT_5(component) \ ((component & 1) | ((1) << 1) | ((5) << 5) | 0x100) /* Other conversions */ #define BIFROST_CONVERT(is_unsigned, roundmode, swizzle, mode) \ ((is_unsigned & 1) | ((roundmode & 3) << 1) | ((swizzle & 3) << 3) | ((mode & 7) << 5)) #define BIFROST_FMA_CONVERT (0xe0000) #define BIFROST_ADD_CONVERT (0x07800) enum bifrost_ldst_type { BIFROST_LDST_F16 = 0, BIFROST_LDST_F32 = 1, BIFROST_LDST_I32 = 2, BIFROST_LDST_U32 = 3 }; #define BIFROST_ADD_OP_LD_VAR_ADDR (0x18000 >> 10) struct bifrost_ld_var_addr { unsigned src0 : 3; unsigned src1 : 3; unsigned location : 5; enum bifrost_ldst_type type : 2; unsigned op : 7; } __attribute__((packed)); #define BIFROST_ADD_OP_LD_ATTR (0x08000 >> 12) struct bifrost_ld_attr { unsigned src0 : 3; unsigned src1 : 3; unsigned location : 5; unsigned channels : 2; /* MALI_POSITIVE */ enum bifrost_ldst_type type : 2; unsigned op : 5; } __attribute__((packed)); enum bifrost_interp_mode { BIFROST_INTERP_PER_FRAG = 0x0, BIFROST_INTERP_CENTROID = 0x1, BIFROST_INTERP_DEFAULT = 0x2, BIFROST_INTERP_EXPLICIT = 0x3 }; #define BIFROST_ADD_OP_LD_VAR_16 (0x1a << 1) #define BIFROST_ADD_OP_LD_VAR_32 (0x0a << 1) /* Fixed location for gl_FragCoord.zw */ #define BIFROST_FRAGZ (23) #define BIFROST_FRAGW (22) struct bifrost_ld_var { unsigned src0 : 3; /* If top two bits set, indirect with src in bottom three */ unsigned addr : 5; unsigned channels : 2; /* MALI_POSITIVE */ enum bifrost_interp_mode interp_mode : 2; unsigned reuse : 1; unsigned flat : 1; unsigned op : 6; } __attribute__((packed)); struct bifrost_tex_ctrl { unsigned sampler_index : 4; // also used to signal indirects unsigned tex_index : 7; bool no_merge_index : 1; // whether to merge (direct) sampler & texture indices bool filter : 1; // use the usual filtering pipeline (0 for texelFetch & textureGather) unsigned unk0 : 2; bool texel_offset : 1; // *Offset() bool is_shadow : 1; bool is_array : 1; unsigned tex_type : 2; // 2D, 3D, Cube, Buffer bool compute_lod : 1; // 0 for *Lod() bool not_supply_lod : 1; // 0 for *Lod() or when a bias is applied bool calc_gradients : 1; // 0 for *Grad() unsigned unk1 : 1; unsigned result_type : 4; // integer, unsigned, float TODO: why is this 4 bits? unsigned unk2 : 4; } __attribute__((packed)); struct bifrost_dual_tex_ctrl { unsigned sampler_index0 : 2; unsigned unk0 : 2; unsigned tex_index0 : 2; unsigned sampler_index1 : 2; unsigned tex_index1 : 2; unsigned unk1 : 22; } __attribute__((packed)); #define BIFROST_ADD_OP_TEX_COMPACT_F32 (0x0b000 >> 10) #define BIFROST_ADD_OP_TEX_COMPACT_F16 (0x1b000 >> 10) struct bifrost_tex_compact { unsigned src0 : 3; unsigned src1 : 3; unsigned tex_index : 3; unsigned unknown : 1; unsigned sampler_index : 3; unsigned op : 7; } __attribute__((packed)); enum branch_bit_size { BR_SIZE_32 = 0, BR_SIZE_16XX = 1, BR_SIZE_16YY = 2, // For the above combinations of bitsize and location, an extra bit is // encoded via comparing the sources. The only possible source of ambiguity // would be if the sources were the same, but then the branch condition // would be always true or always false anyways, so we can ignore it. But // this no longer works when comparing the y component to the x component, // since it's valid to compare the y component of a source against its own // x component. Instead, the extra bit is encoded via an extra bitsize. BR_SIZE_16YX0 = 3, BR_SIZE_16YX1 = 4, BR_SIZE_32_AND_16X = 5, BR_SIZE_32_AND_16Y = 6, // Used for comparisons with zero and always-true, see below. I think this // only works for integer comparisons. BR_SIZE_ZERO = 7, }; enum bifrost_reg_write_unit { REG_WRITE_NONE = 0, // don't write REG_WRITE_TWO, // write using reg2 REG_WRITE_THREE, // write using reg3 }; struct bifrost_regs { unsigned uniform_const : 8; unsigned reg2 : 6; unsigned reg3 : 6; unsigned reg0 : 5; unsigned reg1 : 6; unsigned ctrl : 4; } __attribute__((packed)); enum bifrost_branch_cond { BR_COND_LT = 0, BR_COND_LE = 1, BR_COND_GE = 2, BR_COND_GT = 3, // Equal vs. not-equal determined by src0/src1 comparison BR_COND_EQ = 4, // floating-point comparisons // Becomes UNE when you flip the arguments BR_COND_OEQ = 5, // TODO what happens when you flip the arguments? BR_COND_OGT = 6, BR_COND_OLT = 7, }; enum bifrost_branch_code { BR_ALWAYS = 63, }; struct bifrost_branch { unsigned src0 : 3; /* For BR_SIZE_ZERO, upper two bits become ctrl */ unsigned src1 : 3; /* Offset source -- always uniform/const but * theoretically could support indirect jumps? */ unsigned src2 : 3; enum bifrost_branch_cond cond : 3; enum branch_bit_size size : 3; unsigned op : 5; }; /* Clause packing */ #define BIFROST_FMA_NOP (0x701960 | BIFROST_SRC_STAGE) #define BIFROST_ADD_NOP (0x3D960 | BIFROST_SRC_STAGE) struct bifrost_fmt1 { unsigned ins_0 : 3; unsigned tag : 5; uint64_t ins_1 : 64; unsigned ins_2 : 11; uint64_t header : 45; } __attribute__((packed)); #define BIFROST_FMT1_INSTRUCTIONS 0b00101 #define BIFROST_FMT1_FINAL 0b01001 #define BIFROST_FMT1_CONSTANTS 0b00001 #define BIFROST_FMTC_CONSTANTS 0b0011 #define BIFROST_FMTC_FINAL 0b0111 struct bifrost_fmt_constant { unsigned pos : 4; unsigned tag : 4; uint64_t imm_1 : 60; uint64_t imm_2 : 60; } __attribute__((packed)); enum bifrost_reg_control { BIFROST_WRITE_FMA_P2 = 1, BIFROST_WRITE_FMA_P2_READ_P3 = 2, BIFROST_FIRST_WRITE_FMA_P2_READ_P3 = 3, BIFROST_READ_P3 = 4, BIFROST_WRITE_ADD_P2 = 5, BIFROST_WRITE_ADD_P2_READ_P3 = 6, BIFROST_WRITE_ADD_P2_FMA_P3 = 7, BIFROST_FIRST_NONE = 8, BIFROST_FIRST_WRITE_FMA_P2 = 9, /* INSTR_INVALID_ENC */ BIFROST_REG_NONE = 11, BIFROST_FIRST_READ_P3 = 12, BIFROST_FIRST_WRITE_ADD_P2 = 13, BIFROST_FIRST_WRITE_ADD_P2_READ_P3 = 14, BIFROST_FIRST_WRITE_ADD_P2_FMA_P3 = 15 }; #endif