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Diffstat (limited to 'src/gallium/drivers/etnaviv/etnaviv_compiler.c')
| -rw-r--r-- | src/gallium/drivers/etnaviv/etnaviv_compiler.c | 2532 |
1 files changed, 2532 insertions, 0 deletions
diff --git a/src/gallium/drivers/etnaviv/etnaviv_compiler.c b/src/gallium/drivers/etnaviv/etnaviv_compiler.c new file mode 100644 index 00000000000..59e1452d801 --- /dev/null +++ b/src/gallium/drivers/etnaviv/etnaviv_compiler.c @@ -0,0 +1,2532 @@ +/* + * Copyright (c) 2012-2015 Etnaviv Project + * + * 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, sub license, + * 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 NON-INFRINGEMENT. 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. + * + * Authors: + * Wladimir J. van der Laan <laanwj@gmail.com> + */ + +/* TGSI->Vivante shader ISA conversion */ + +/* What does the compiler return (see etna_shader_object)? + * 1) instruction data + * 2) input-to-temporary mapping (fixed for ps) + * *) in case of ps, semantic -> varying id mapping + * *) for each varying: number of components used (r, rg, rgb, rgba) + * 3) temporary-to-output mapping (in case of vs, fixed for ps) + * 4) for each input/output: possible semantic (position, color, glpointcoord, ...) + * 5) immediates base offset, immediates data + * 6) used texture units (and possibly the TGSI_TEXTURE_* type); not needed to + * configure the hw, but useful for error checking + * 7) enough information to add the z=(z+w)/2.0 necessary for older chips + * (output reg id is enough) + * + * Empty shaders are not allowed, should always at least generate a NOP. Also + * if there is a label at the end of the shader, an extra NOP should be + * generated as jump target. + * + * TODO + * * Use an instruction scheduler + * * Indirect access to uniforms / temporaries using amode + */ + +#include "etnaviv_compiler.h" + +#include "etnaviv_asm.h" +#include "etnaviv_context.h" +#include "etnaviv_debug.h" +#include "etnaviv_disasm.h" +#include "etnaviv_uniforms.h" +#include "etnaviv_util.h" + +#include "pipe/p_shader_tokens.h" +#include "tgsi/tgsi_info.h" +#include "tgsi/tgsi_iterate.h" +#include "tgsi/tgsi_lowering.h" +#include "tgsi/tgsi_strings.h" +#include "tgsi/tgsi_util.h" +#include "util/u_math.h" +#include "util/u_memory.h" + +#include <fcntl.h> +#include <stdio.h> +#include <sys/stat.h> +#include <sys/types.h> + +#define ETNA_MAX_INNER_TEMPS 2 + +static const float sincos_const[2][4] = { + { + 2., -1., 4., -4., + }, + { + 1. / (2. * M_PI), 0.75, 0.5, 0.0, + }, +}; + +/* Native register description structure */ +struct etna_native_reg { + unsigned valid : 1; + unsigned is_tex : 1; /* is texture unit, overrides rgroup */ + unsigned rgroup : 3; + unsigned id : 9; +}; + +/* Register description */ +struct etna_reg_desc { + enum tgsi_file_type file; /* IN, OUT, TEMP, ... */ + int idx; /* index into file */ + bool active; /* used in program */ + int first_use; /* instruction id of first use (scope begin) */ + int last_use; /* instruction id of last use (scope end, inclusive) */ + + struct etna_native_reg native; /* native register to map to */ + unsigned usage_mask : 4; /* usage, per channel */ + bool has_semantic; /* register has associated TGSI semantic */ + struct tgsi_declaration_semantic semantic; /* TGSI semantic */ + struct tgsi_declaration_interp interp; /* Interpolation type */ +}; + +/* Label information structure */ +struct etna_compile_label { + int inst_idx; /* Instruction id that label points to */ +}; + +enum etna_compile_frame_type { + ETNA_COMPILE_FRAME_IF, /* IF/ELSE/ENDIF */ + ETNA_COMPILE_FRAME_LOOP, +}; + +/* nesting scope frame (LOOP, IF, ...) during compilation + */ +struct etna_compile_frame { + enum etna_compile_frame_type type; + struct etna_compile_label *lbl_else; + struct etna_compile_label *lbl_endif; + struct etna_compile_label *lbl_loop_bgn; + struct etna_compile_label *lbl_loop_end; +}; + +struct etna_compile_file { + /* Number of registers in each TGSI file (max register+1) */ + size_t reg_size; + /* Register descriptions, per register index */ + struct etna_reg_desc *reg; +}; + +#define array_insert(arr, val) \ + do { \ + if (arr##_count == arr##_sz) { \ + arr##_sz = MAX2(2 * arr##_sz, 16); \ + arr = realloc(arr, arr##_sz * sizeof(arr[0])); \ + } \ + arr[arr##_count++] = val; \ + } while (0) + + +/* scratch area for compiling shader, freed after compilation finishes */ +struct etna_compile { + const struct tgsi_token *tokens; + bool free_tokens; + + struct tgsi_shader_info info; + + /* Register descriptions, per TGSI file, per register index */ + struct etna_compile_file file[TGSI_FILE_COUNT]; + + /* Keep track of TGSI register declarations */ + struct etna_reg_desc decl[ETNA_MAX_DECL]; + uint total_decls; + + /* Bitmap of dead instructions which are removed in a separate pass */ + bool dead_inst[ETNA_MAX_TOKENS]; + + /* Immediate data */ + enum etna_immediate_contents imm_contents[ETNA_MAX_IMM]; + uint32_t imm_data[ETNA_MAX_IMM]; + uint32_t imm_base; /* base of immediates (in 32 bit units) */ + uint32_t imm_size; /* size of immediates (in 32 bit units) */ + + /* Next free native register, for register allocation */ + uint32_t next_free_native; + + /* Temporary register for use within translated TGSI instruction, + * only allocated when needed. + */ + int inner_temps; /* number of inner temps used; only up to one available at + this point */ + struct etna_native_reg inner_temp[ETNA_MAX_INNER_TEMPS]; + + /* Fields for handling nested conditionals */ + struct etna_compile_frame frame_stack[ETNA_MAX_DEPTH]; + int frame_sp; + struct etna_compile_label *lbl_usage[ETNA_MAX_INSTRUCTIONS]; + + unsigned labels_count, labels_sz; + struct etna_compile_label *labels; + + /* Code generation */ + int inst_ptr; /* current instruction pointer */ + uint32_t code[ETNA_MAX_INSTRUCTIONS * ETNA_INST_SIZE]; + + /* I/O */ + + /* Number of varyings (PS only) */ + int num_varyings; + + /* GPU hardware specs */ + const struct etna_specs *specs; +}; + +static struct etna_reg_desc * +etna_get_dst_reg(struct etna_compile *c, struct tgsi_dst_register dst) +{ + return &c->file[dst.File].reg[dst.Index]; +} + +static struct etna_reg_desc * +etna_get_src_reg(struct etna_compile *c, struct tgsi_src_register src) +{ + return &c->file[src.File].reg[src.Index]; +} + +static struct etna_native_reg +etna_native_temp(unsigned reg) +{ + return (struct etna_native_reg) { + .valid = 1, + .rgroup = INST_RGROUP_TEMP, + .id = reg + }; +} + +/** Register allocation **/ +enum reg_sort_order { + FIRST_USE_ASC, + FIRST_USE_DESC, + LAST_USE_ASC, + LAST_USE_DESC +}; + +/* Augmented register description for sorting */ +struct sort_rec { + struct etna_reg_desc *ptr; + int key; +}; + +static int +sort_rec_compar(const struct sort_rec *a, const struct sort_rec *b) +{ + if (a->key < b->key) + return -1; + + if (a->key > b->key) + return 1; + + return 0; +} + +/* create an index on a register set based on certain criteria. */ +static int +sort_registers(struct sort_rec *sorted, struct etna_compile_file *file, + enum reg_sort_order so) +{ + struct etna_reg_desc *regs = file->reg; + int ptr = 0; + + /* pre-populate keys from active registers */ + for (int idx = 0; idx < file->reg_size; ++idx) { + /* only interested in active registers now; will only assign inactive ones + * if no space in active ones */ + if (regs[idx].active) { + sorted[ptr].ptr = ®s[idx]; + + switch (so) { + case FIRST_USE_ASC: + sorted[ptr].key = regs[idx].first_use; + break; + case LAST_USE_ASC: + sorted[ptr].key = regs[idx].last_use; + break; + case FIRST_USE_DESC: + sorted[ptr].key = -regs[idx].first_use; + break; + case LAST_USE_DESC: + sorted[ptr].key = -regs[idx].last_use; + break; + } + ptr++; + } + } + + /* sort index by key */ + qsort(sorted, ptr, sizeof(struct sort_rec), + (int (*)(const void *, const void *))sort_rec_compar); + + return ptr; +} + +/* Allocate a new, unused, native temp register */ +static struct etna_native_reg +alloc_new_native_reg(struct etna_compile *c) +{ + assert(c->next_free_native < ETNA_MAX_TEMPS); + return etna_native_temp(c->next_free_native++); +} + +/* assign TEMPs to native registers */ +static void +assign_temporaries_to_native(struct etna_compile *c, + struct etna_compile_file *file) +{ + struct etna_reg_desc *temps = file->reg; + + for (int idx = 0; idx < file->reg_size; ++idx) + temps[idx].native = alloc_new_native_reg(c); +} + +/* assign inputs and outputs to temporaries + * Gallium assumes that the hardware has separate registers for taking input and + * output, however Vivante GPUs use temporaries both for passing in inputs and + * passing back outputs. + * Try to re-use temporary registers where possible. */ +static void +assign_inouts_to_temporaries(struct etna_compile *c, uint file) +{ + bool mode_inputs = (file == TGSI_FILE_INPUT); + int inout_ptr = 0, num_inouts; + int temp_ptr = 0, num_temps; + struct sort_rec inout_order[ETNA_MAX_TEMPS]; + struct sort_rec temps_order[ETNA_MAX_TEMPS]; + num_inouts = sort_registers(inout_order, &c->file[file], + mode_inputs ? LAST_USE_ASC : FIRST_USE_ASC); + num_temps = sort_registers(temps_order, &c->file[TGSI_FILE_TEMPORARY], + mode_inputs ? FIRST_USE_ASC : LAST_USE_ASC); + + while (inout_ptr < num_inouts && temp_ptr < num_temps) { + struct etna_reg_desc *inout = inout_order[inout_ptr].ptr; + struct etna_reg_desc *temp = temps_order[temp_ptr].ptr; + + if (!inout->active || inout->native.valid) { /* Skip if already a native register assigned */ + inout_ptr++; + continue; + } + + /* last usage of this input is before or in same instruction of first use + * of temporary? */ + if (mode_inputs ? (inout->last_use <= temp->first_use) + : (inout->first_use >= temp->last_use)) { + /* assign it and advance to next input */ + inout->native = temp->native; + inout_ptr++; + } + + temp_ptr++; + } + + /* if we couldn't reuse current ones, allocate new temporaries */ + for (inout_ptr = 0; inout_ptr < num_inouts; ++inout_ptr) { + struct etna_reg_desc *inout = inout_order[inout_ptr].ptr; + + if (inout->active && !inout->native.valid) + inout->native = alloc_new_native_reg(c); + } +} + +/* Allocate an immediate with a certain value and return the index. If + * there is already an immediate with that value, return that. + */ +static struct etna_inst_src +alloc_imm(struct etna_compile *c, enum etna_immediate_contents contents, + uint32_t value) +{ + int idx; + + /* Could use a hash table to speed this up */ + for (idx = 0; idx < c->imm_size; ++idx) { + if (c->imm_contents[idx] == contents && c->imm_data[idx] == value) + break; + } + + /* look if there is an unused slot */ + if (idx == c->imm_size) { + for (idx = 0; idx < c->imm_size; ++idx) { + if (c->imm_contents[idx] == ETNA_IMMEDIATE_UNUSED) + break; + } + } + + /* allocate new immediate */ + if (idx == c->imm_size) { + assert(c->imm_size < ETNA_MAX_IMM); + idx = c->imm_size++; + c->imm_data[idx] = value; + c->imm_contents[idx] = contents; + } + + /* swizzle so that component with value is returned in all components */ + idx += c->imm_base; + struct etna_inst_src imm_src = { + .use = 1, + .rgroup = INST_RGROUP_UNIFORM_0, + .reg = idx / 4, + .swiz = INST_SWIZ_BROADCAST(idx & 3) + }; + + return imm_src; +} + +static struct etna_inst_src +alloc_imm_u32(struct etna_compile *c, uint32_t value) +{ + return alloc_imm(c, ETNA_IMMEDIATE_CONSTANT, value); +} + +static struct etna_inst_src +alloc_imm_vec4u(struct etna_compile *c, enum etna_immediate_contents contents, + const uint32_t *values) +{ + struct etna_inst_src imm_src = { }; + int idx, i; + + for (idx = 0; idx + 3 < c->imm_size; idx += 4) { + /* What if we can use a uniform with a different swizzle? */ + for (i = 0; i < 4; i++) + if (c->imm_contents[idx + i] != contents || c->imm_data[idx + i] != values[i]) + break; + if (i == 4) + break; + } + + if (idx + 3 >= c->imm_size) { + idx = align(c->imm_size, 4); + assert(idx + 4 <= ETNA_MAX_IMM); + + for (i = 0; i < 4; i++) { + c->imm_data[idx + i] = values[i]; + c->imm_contents[idx + i] = contents; + } + + c->imm_size = idx + 4; + } + + assert((c->imm_base & 3) == 0); + idx += c->imm_base; + imm_src.use = 1; + imm_src.rgroup = INST_RGROUP_UNIFORM_0; + imm_src.reg = idx / 4; + imm_src.swiz = INST_SWIZ_IDENTITY; + + return imm_src; +} + +static uint32_t +get_imm_u32(struct etna_compile *c, const struct etna_inst_src *imm, + unsigned swiz_idx) +{ + assert(imm->use == 1 && imm->rgroup == INST_RGROUP_UNIFORM_0); + unsigned int idx = imm->reg * 4 + ((imm->swiz >> (swiz_idx * 2)) & 3); + + return c->imm_data[idx]; +} + +/* Allocate immediate with a certain float value. If there is already an + * immediate with that value, return that. + */ +static struct etna_inst_src +alloc_imm_f32(struct etna_compile *c, float value) +{ + return alloc_imm_u32(c, fui(value)); +} + +static struct etna_inst_src +etna_imm_vec4f(struct etna_compile *c, const float *vec4) +{ + uint32_t val[4]; + + for (int i = 0; i < 4; i++) + val[i] = fui(vec4[i]); + + return alloc_imm_vec4u(c, ETNA_IMMEDIATE_CONSTANT, val); +} + +/* Pass -- check register file declarations and immediates */ +static void +etna_compile_parse_declarations(struct etna_compile *c) +{ + struct tgsi_parse_context ctx = { }; + unsigned status = TGSI_PARSE_OK; + status = tgsi_parse_init(&ctx, c->tokens); + assert(status == TGSI_PARSE_OK); + + while (!tgsi_parse_end_of_tokens(&ctx)) { + tgsi_parse_token(&ctx); + + switch (ctx.FullToken.Token.Type) { + case TGSI_TOKEN_TYPE_IMMEDIATE: { + /* immediates are handled differently from other files; they are + * not declared explicitly, and always add four components */ + const struct tgsi_full_immediate *imm = &ctx.FullToken.FullImmediate; + assert(c->imm_size <= (ETNA_MAX_IMM - 4)); + + for (int i = 0; i < 4; ++i) { + unsigned idx = c->imm_size++; + + c->imm_data[idx] = imm->u[i].Uint; + c->imm_contents[idx] = ETNA_IMMEDIATE_CONSTANT; + } + } + break; + } + } + + tgsi_parse_free(&ctx); +} + +/* Allocate register declarations for the registers in all register files */ +static void +etna_allocate_decls(struct etna_compile *c) +{ + uint idx = 0; + + for (int x = 0; x < TGSI_FILE_COUNT; ++x) { + c->file[x].reg = &c->decl[idx]; + c->file[x].reg_size = c->info.file_max[x] + 1; + + for (int sub = 0; sub < c->file[x].reg_size; ++sub) { + c->decl[idx].file = x; + c->decl[idx].idx = sub; + idx++; + } + } + + c->total_decls = idx; +} + +/* Pass -- check and record usage of temporaries, inputs, outputs */ +static void +etna_compile_pass_check_usage(struct etna_compile *c) +{ + struct tgsi_parse_context ctx = { }; + unsigned status = TGSI_PARSE_OK; + status = tgsi_parse_init(&ctx, c->tokens); + assert(status == TGSI_PARSE_OK); + + for (int idx = 0; idx < c->total_decls; ++idx) { + c->decl[idx].active = false; + c->decl[idx].first_use = c->decl[idx].last_use = -1; + } + + int inst_idx = 0; + while (!tgsi_parse_end_of_tokens(&ctx)) { + tgsi_parse_token(&ctx); + /* find out max register #s used + * For every register mark first and last instruction index where it's + * used this allows finding ranges where the temporary can be borrowed + * as input and/or output register + * + * XXX in the case of loops this needs special care, or even be completely + * disabled, as + * the last usage of a register inside a loop means it can still be used + * on next loop + * iteration (execution is no longer * chronological). The register can + * only be + * declared "free" after the loop finishes. + * + * Same for inputs: the first usage of a register inside a loop doesn't + * mean that the register + * won't have been overwritten in previous iteration. The register can + * only be declared free before the loop + * starts. + * The proper way would be to do full dominator / post-dominator analysis + * (especially with more complicated + * control flow such as direct branch instructions) but not for now... + */ + switch (ctx.FullToken.Token.Type) { + case TGSI_TOKEN_TYPE_DECLARATION: { + /* Declaration: fill in file details */ + const struct tgsi_full_declaration *decl = &ctx.FullToken.FullDeclaration; + struct etna_compile_file *file = &c->file[decl->Declaration.File]; + + for (int idx = decl->Range.First; idx <= decl->Range.Last; ++idx) { + file->reg[idx].usage_mask = 0; // we'll compute this ourselves + file->reg[idx].has_semantic = decl->Declaration.Semantic; + file->reg[idx].semantic = decl->Semantic; + file->reg[idx].interp = decl->Interp; + } + } break; + case TGSI_TOKEN_TYPE_INSTRUCTION: { + /* Instruction: iterate over operands of instruction */ + const struct tgsi_full_instruction *inst = &ctx.FullToken.FullInstruction; + + /* iterate over destination registers */ + for (int idx = 0; idx < inst->Instruction.NumDstRegs; ++idx) { + struct etna_reg_desc *reg_desc = &c->file[inst->Dst[idx].Register.File].reg[inst->Dst[idx].Register.Index]; + + if (reg_desc->first_use == -1) + reg_desc->first_use = inst_idx; + + reg_desc->last_use = inst_idx; + reg_desc->active = true; + } + + /* iterate over source registers */ + for (int idx = 0; idx < inst->Instruction.NumSrcRegs; ++idx) { + struct etna_reg_desc *reg_desc = &c->file[inst->Src[idx].Register.File].reg[inst->Src[idx].Register.Index]; + + if (reg_desc->first_use == -1) + reg_desc->first_use = inst_idx; + + reg_desc->last_use = inst_idx; + reg_desc->active = true; + /* accumulate usage mask for register, this is used to determine how + * many slots for varyings + * should be allocated */ + reg_desc->usage_mask |= tgsi_util_get_inst_usage_mask(inst, idx); + } + inst_idx += 1; + } break; + default: + break; + } + } + + tgsi_parse_free(&ctx); +} + +/* assign inputs that need to be assigned to specific registers */ +static void +assign_special_inputs(struct etna_compile *c) +{ + if (c->info.processor == PIPE_SHADER_FRAGMENT) { + /* never assign t0 as it is the position output, start assigning at t1 */ + c->next_free_native = 1; + + /* hardwire TGSI_SEMANTIC_POSITION (input and output) to t0 */ + for (int idx = 0; idx < c->total_decls; ++idx) { + struct etna_reg_desc *reg = &c->decl[idx]; + + if (reg->active && reg->semantic.Name == TGSI_SEMANTIC_POSITION) + reg->native = etna_native_temp(0); + } + } +} + +/* Check that a move instruction does not swizzle any of the components + * that it writes. + */ +static bool +etna_mov_check_no_swizzle(const struct tgsi_dst_register dst, + const struct tgsi_src_register src) +{ + return (!(dst.WriteMask & TGSI_WRITEMASK_X) || src.SwizzleX == TGSI_SWIZZLE_X) && + (!(dst.WriteMask & TGSI_WRITEMASK_Y) || src.SwizzleY == TGSI_SWIZZLE_Y) && + (!(dst.WriteMask & TGSI_WRITEMASK_Z) || src.SwizzleZ == TGSI_SWIZZLE_Z) && + (!(dst.WriteMask & TGSI_WRITEMASK_W) || src.SwizzleW == TGSI_SWIZZLE_W); +} + +/* Pass -- optimize outputs + * Mesa tends to generate code like this at the end if their shaders + * MOV OUT[1], TEMP[2] + * MOV OUT[0], TEMP[0] + * MOV OUT[2], TEMP[1] + * Recognize if + * a) there is only a single assignment to an output register and + * b) the temporary is not used after that + * Also recognize direct assignment of IN to OUT (passthrough) + **/ +static void +etna_compile_pass_optimize_outputs(struct etna_compile *c) +{ + struct tgsi_parse_context ctx = { }; + int inst_idx = 0; + unsigned status = TGSI_PARSE_OK; + status = tgsi_parse_init(&ctx, c->tokens); + assert(status == TGSI_PARSE_OK); + + while (!tgsi_parse_end_of_tokens(&ctx)) { + tgsi_parse_token(&ctx); + + switch (ctx.FullToken.Token.Type) { + case TGSI_TOKEN_TYPE_INSTRUCTION: { + const struct tgsi_full_instruction *inst = &ctx.FullToken.FullInstruction; + + /* iterate over operands */ + switch (inst->Instruction.Opcode) { + case TGSI_OPCODE_MOV: { + /* We are only interested in eliminating MOVs which write to + * the shader outputs. Test for this early. */ + if (inst->Dst[0].Register.File != TGSI_FILE_OUTPUT) + break; + /* Elimination of a MOV must have no visible effect on the + * resulting shader: this means the MOV must not swizzle or + * saturate, and its source must not have the negate or + * absolute modifiers. */ + if (!etna_mov_check_no_swizzle(inst->Dst[0].Register, inst->Src[0].Register) || + inst->Instruction.Saturate || inst->Src[0].Register.Negate || + inst->Src[0].Register.Absolute) + break; + + uint out_idx = inst->Dst[0].Register.Index; + uint in_idx = inst->Src[0].Register.Index; + /* assignment of temporary to output -- + * and the output doesn't yet have a native register assigned + * and the last use of the temporary is this instruction + * and the MOV does not do a swizzle + */ + if (inst->Src[0].Register.File == TGSI_FILE_TEMPORARY && + !c->file[TGSI_FILE_OUTPUT].reg[out_idx].native.valid && + c->file[TGSI_FILE_TEMPORARY].reg[in_idx].last_use == inst_idx) { + c->file[TGSI_FILE_OUTPUT].reg[out_idx].native = + c->file[TGSI_FILE_TEMPORARY].reg[in_idx].native; + /* prevent temp from being re-used for the rest of the shader */ + c->file[TGSI_FILE_TEMPORARY].reg[in_idx].last_use = ETNA_MAX_TOKENS; + /* mark this MOV instruction as a no-op */ + c->dead_inst[inst_idx] = true; + } + /* direct assignment of input to output -- + * and the input or output doesn't yet have a native register + * assigned + * and the output is only used in this instruction, + * allocate a new register, and associate both input and output to + * it + * and the MOV does not do a swizzle + */ + if (inst->Src[0].Register.File == TGSI_FILE_INPUT && + !c->file[TGSI_FILE_INPUT].reg[in_idx].native.valid && + !c->file[TGSI_FILE_OUTPUT].reg[out_idx].native.valid && + c->file[TGSI_FILE_OUTPUT].reg[out_idx].last_use == inst_idx && + c->file[TGSI_FILE_OUTPUT].reg[out_idx].first_use == inst_idx) { + c->file[TGSI_FILE_OUTPUT].reg[out_idx].native = + c->file[TGSI_FILE_INPUT].reg[in_idx].native = + alloc_new_native_reg(c); + /* mark this MOV instruction as a no-op */ + c->dead_inst[inst_idx] = true; + } + } break; + default:; + } + inst_idx += 1; + } break; + } + } + + tgsi_parse_free(&ctx); +} + +/* Get a temporary to be used within one TGSI instruction. + * The first time that this function is called the temporary will be allocated. + * Each call to this function will return the same temporary. + */ +static struct etna_native_reg +etna_compile_get_inner_temp(struct etna_compile *c) +{ + int inner_temp = c->inner_temps; + + if (inner_temp < ETNA_MAX_INNER_TEMPS) { + if (!c->inner_temp[inner_temp].valid) + c->inner_temp[inner_temp] = alloc_new_native_reg(c); + + /* alloc_new_native_reg() handles lack of registers */ + c->inner_temps += 1; + } else { + BUG("Too many inner temporaries (%i) requested in one instruction", + inner_temp + 1); + } + + return c->inner_temp[inner_temp]; +} + +static struct etna_inst_dst +etna_native_to_dst(struct etna_native_reg native, unsigned comps) +{ + /* Can only assign to temporaries */ + assert(native.valid && !native.is_tex && native.rgroup == INST_RGROUP_TEMP); + + struct etna_inst_dst rv = { + .comps = comps, + .use = 1, + .reg = native.id, + }; + + return rv; +} + +static struct etna_inst_src +etna_native_to_src(struct etna_native_reg native, uint32_t swizzle) +{ + assert(native.valid && !native.is_tex); + + struct etna_inst_src rv = { + .use = 1, + .swiz = swizzle, + .rgroup = native.rgroup, + .reg = native.id, + .amode = INST_AMODE_DIRECT, + }; + + return rv; +} + +static inline struct etna_inst_src +negate(struct etna_inst_src src) +{ + src.neg = !src.neg; + + return src; +} + +static inline struct etna_inst_src +absolute(struct etna_inst_src src) +{ + src.abs = 1; + + return src; +} + +static inline struct etna_inst_src +swizzle(struct etna_inst_src src, unsigned swizzle) +{ + src.swiz = inst_swiz_compose(src.swiz, swizzle); + + return src; +} + +/* Emit instruction and append it to program */ +static void +emit_inst(struct etna_compile *c, struct etna_inst *inst) +{ + assert(c->inst_ptr <= ETNA_MAX_INSTRUCTIONS); + + /* Check for uniform conflicts (each instruction can only access one + * uniform), + * if detected, use an intermediate temporary */ + unsigned uni_rgroup = -1; + unsigned uni_reg = -1; + + for (int src = 0; src < ETNA_NUM_SRC; ++src) { + if (etna_rgroup_is_uniform(inst->src[src].rgroup)) { + if (uni_reg == -1) { /* first unique uniform used */ + uni_rgroup = inst->src[src].rgroup; + uni_reg = inst->src[src].reg; + } else { /* second or later; check that it is a re-use */ + if (uni_rgroup != inst->src[src].rgroup || + uni_reg != inst->src[src].reg) { + DBG_F(ETNA_DBG_COMPILER_MSGS, "perf warning: instruction that " + "accesses different uniforms, " + "need to generate extra MOV"); + struct etna_native_reg inner_temp = etna_compile_get_inner_temp(c); + + /* Generate move instruction to temporary */ + etna_assemble(&c->code[c->inst_ptr * 4], &(struct etna_inst) { + .opcode = INST_OPCODE_MOV, + .dst = etna_native_to_dst(inner_temp, INST_COMPS_X | INST_COMPS_Y | + INST_COMPS_Z | INST_COMPS_W), + .src[2] = inst->src[src] + }); + + c->inst_ptr++; + + /* Modify instruction to use temp register instead of uniform */ + inst->src[src].use = 1; + inst->src[src].rgroup = INST_RGROUP_TEMP; + inst->src[src].reg = inner_temp.id; + inst->src[src].swiz = INST_SWIZ_IDENTITY; /* swizzling happens on MOV */ + inst->src[src].neg = 0; /* negation happens on MOV */ + inst->src[src].abs = 0; /* abs happens on MOV */ + inst->src[src].amode = 0; /* amode effects happen on MOV */ + } + } + } + } + + /* Finally assemble the actual instruction */ + etna_assemble(&c->code[c->inst_ptr * 4], inst); + c->inst_ptr++; +} + +static unsigned int +etna_amode(struct tgsi_ind_register indirect) +{ + assert(indirect.File == TGSI_FILE_ADDRESS); + assert(indirect.Index == 0); + + switch (indirect.Swizzle) { + case TGSI_SWIZZLE_X: + return INST_AMODE_ADD_A_X; + case TGSI_SWIZZLE_Y: + return INST_AMODE_ADD_A_Y; + case TGSI_SWIZZLE_Z: + return INST_AMODE_ADD_A_Z; + case TGSI_SWIZZLE_W: + return INST_AMODE_ADD_A_W; + default: + assert(!"Invalid swizzle"); + } +} + +/* convert destination operand */ +static struct etna_inst_dst +convert_dst(struct etna_compile *c, const struct tgsi_full_dst_register *in) +{ + struct etna_inst_dst rv = { + /// XXX .amode + .comps = in->Register.WriteMask, + }; + + if (in->Register.File == TGSI_FILE_ADDRESS) { + assert(in->Register.Index == 0); + rv.reg = in->Register.Index; + rv.use = 0; + } else { + rv = etna_native_to_dst(etna_get_dst_reg(c, in->Register)->native, + in->Register.WriteMask); + } + + if (in->Register.Indirect) + rv.amode = etna_amode(in->Indirect); + + return rv; +} + +/* convert texture operand */ +static struct etna_inst_tex +convert_tex(struct etna_compile *c, const struct tgsi_full_src_register *in, + const struct tgsi_instruction_texture *tex) +{ + struct etna_native_reg native_reg = etna_get_src_reg(c, in->Register)->native; + struct etna_inst_tex rv = { + // XXX .amode (to allow for an array of samplers?) + .swiz = INST_SWIZ_IDENTITY + }; + + assert(native_reg.is_tex && native_reg.valid); + rv.id = native_reg.id; + + return rv; +} + +/* convert source operand */ +static struct etna_inst_src +etna_create_src(const struct tgsi_full_src_register *tgsi, + const struct etna_native_reg *native) +{ + const struct tgsi_src_register *reg = &tgsi->Register; + struct etna_inst_src rv = { + .use = 1, + .swiz = INST_SWIZ(reg->SwizzleX, reg->SwizzleY, reg->SwizzleZ, reg->SwizzleW), + .neg = reg->Negate, + .abs = reg->Absolute, + .rgroup = native->rgroup, + .reg = native->id, + .amode = INST_AMODE_DIRECT, + }; + + assert(native->valid && !native->is_tex); + + if (reg->Indirect) + rv.amode = etna_amode(tgsi->Indirect); + + return rv; +} + +static struct etna_inst_src +etna_mov_src_to_temp(struct etna_compile *c, struct etna_inst_src src, + struct etna_native_reg temp) +{ + struct etna_inst mov = { }; + + mov.opcode = INST_OPCODE_MOV; + mov.sat = 0; + mov.dst = etna_native_to_dst(temp, INST_COMPS_X | INST_COMPS_Y | + INST_COMPS_Z | INST_COMPS_W); + mov.src[2] = src; + emit_inst(c, &mov); + + src.swiz = INST_SWIZ_IDENTITY; + src.neg = src.abs = 0; + src.rgroup = temp.rgroup; + src.reg = temp.id; + + return src; +} + +static struct etna_inst_src +etna_mov_src(struct etna_compile *c, struct etna_inst_src src) +{ + struct etna_native_reg temp = etna_compile_get_inner_temp(c); + + return etna_mov_src_to_temp(c, src, temp); +} + +static bool +etna_src_uniforms_conflict(struct etna_inst_src a, struct etna_inst_src b) +{ + return etna_rgroup_is_uniform(a.rgroup) && + etna_rgroup_is_uniform(b.rgroup) && + (a.rgroup != b.rgroup || a.reg != b.reg); +} + +/* create a new label */ +static struct etna_compile_label * +alloc_new_label(struct etna_compile *c) +{ + struct etna_compile_label label = { + .inst_idx = -1, /* start by point to no specific instruction */ + }; + + array_insert(c->labels, label); + + return &c->labels[c->labels_count - 1]; +} + +/* place label at current instruction pointer */ +static void +label_place(struct etna_compile *c, struct etna_compile_label *label) +{ + label->inst_idx = c->inst_ptr; +} + +/* mark label use at current instruction. + * target of the label will be filled in in the marked instruction's src2.imm + * slot as soon + * as the value becomes known. + */ +static void +label_mark_use(struct etna_compile *c, struct etna_compile_label *label) +{ + assert(c->inst_ptr < ETNA_MAX_INSTRUCTIONS); + c->lbl_usage[c->inst_ptr] = label; +} + +/* walk the frame stack and return first frame with matching type */ +static struct etna_compile_frame * +find_frame(struct etna_compile *c, enum etna_compile_frame_type type) +{ + for (unsigned sp = c->frame_sp; sp >= 0; sp--) + if (c->frame_stack[sp].type == type) + return &c->frame_stack[sp]; + + assert(0); + return NULL; +} + +struct instr_translater { + void (*fxn)(const struct instr_translater *t, struct etna_compile *c, + const struct tgsi_full_instruction *inst, + struct etna_inst_src *src); + unsigned tgsi_opc; + uint8_t opc; + + /* tgsi src -> etna src swizzle */ + int src[3]; + + unsigned cond; +}; + +static void +trans_instr(const struct instr_translater *t, struct etna_compile *c, + const struct tgsi_full_instruction *inst, struct etna_inst_src *src) +{ + const struct tgsi_opcode_info *info = tgsi_get_opcode_info(inst->Instruction.Opcode); + struct etna_inst instr = { }; + + instr.opcode = t->opc; + instr.cond = t->cond; + instr.sat = inst->Instruction.Saturate; + + assert(info->num_dst <= 1); + if (info->num_dst) + instr.dst = convert_dst(c, &inst->Dst[0]); + + assert(info->num_src <= ETNA_NUM_SRC); + + for (unsigned i = 0; i < info->num_src; i++) { + int swizzle = t->src[i]; + + assert(swizzle != -1); + instr.src[swizzle] = src[i]; + } + + emit_inst(c, &instr); +} + +static void +trans_min_max(const struct instr_translater *t, struct etna_compile *c, + const struct tgsi_full_instruction *inst, + struct etna_inst_src *src) +{ + emit_inst(c, &(struct etna_inst) { + .opcode = INST_OPCODE_SELECT, + .cond = t->cond, + .sat = inst->Instruction.Saturate, + .dst = convert_dst(c, &inst->Dst[0]), + .src[0] = src[0], + .src[1] = src[1], + .src[2] = src[0], + }); +} + +static void +trans_if(const struct instr_translater *t, struct etna_compile *c, + const struct tgsi_full_instruction *inst, struct etna_inst_src *src) +{ + struct etna_compile_frame *f = &c->frame_stack[c->frame_sp++]; + struct etna_inst_src imm_0 = alloc_imm_f32(c, 0.0f); + + /* push IF to stack */ + f->type = ETNA_COMPILE_FRAME_IF; + /* create "else" label */ + f->lbl_else = alloc_new_label(c); + f->lbl_endif = NULL; + + /* We need to avoid the emit_inst() below becoming two instructions */ + if (etna_src_uniforms_conflict(src[0], imm_0)) + src[0] = etna_mov_src(c, src[0]); + + /* mark position in instruction stream of label reference so that it can be + * filled in in next pass */ + label_mark_use(c, f->lbl_else); + + /* create conditional branch to label if src0 EQ 0 */ + emit_inst(c, &(struct etna_inst){ + .opcode = INST_OPCODE_BRANCH, + .cond = INST_CONDITION_EQ, + .src[0] = src[0], + .src[1] = imm_0, + /* imm is filled in later */ + }); +} + +static void +trans_else(const struct instr_translater *t, struct etna_compile *c, + const struct tgsi_full_instruction *inst, struct etna_inst_src *src) +{ + assert(c->frame_sp > 0); + struct etna_compile_frame *f = &c->frame_stack[c->frame_sp - 1]; + assert(f->type == ETNA_COMPILE_FRAME_IF); + + /* create "endif" label, and branch to endif label */ + f->lbl_endif = alloc_new_label(c); + label_mark_use(c, f->lbl_endif); + emit_inst(c, &(struct etna_inst) { + .opcode = INST_OPCODE_BRANCH, + .cond = INST_CONDITION_TRUE, + /* imm is filled in later */ + }); + + /* mark "else" label at this position in instruction stream */ + label_place(c, f->lbl_else); +} + +static void +trans_endif(const struct instr_translater *t, struct etna_compile *c, + const struct tgsi_full_instruction *inst, struct etna_inst_src *src) +{ + assert(c->frame_sp > 0); + struct etna_compile_frame *f = &c->frame_stack[--c->frame_sp]; + assert(f->type == ETNA_COMPILE_FRAME_IF); + + /* assign "endif" or "else" (if no ELSE) label to current position in + * instruction stream, pop IF */ + if (f->lbl_endif != NULL) + label_place(c, f->lbl_endif); + else + label_place(c, f->lbl_else); +} + +static void +trans_loop_bgn(const struct instr_translater *t, struct etna_compile *c, + const struct tgsi_full_instruction *inst, + struct etna_inst_src *src) +{ + struct etna_compile_frame *f = &c->frame_stack[c->frame_sp++]; + + /* push LOOP to stack */ + f->type = ETNA_COMPILE_FRAME_LOOP; + f->lbl_loop_bgn = alloc_new_label(c); + f->lbl_loop_end = alloc_new_label(c); + + label_place(c, f->lbl_loop_bgn); +} + +static void +trans_loop_end(const struct instr_translater *t, struct etna_compile *c, + const struct tgsi_full_instruction *inst, + struct etna_inst_src *src) +{ + assert(c->frame_sp > 0); + struct etna_compile_frame *f = &c->frame_stack[--c->frame_sp]; + assert(f->type == ETNA_COMPILE_FRAME_LOOP); + + /* mark position in instruction stream of label reference so that it can be + * filled in in next pass */ + label_mark_use(c, f->lbl_loop_bgn); + + /* create branch to loop_bgn label */ + emit_inst(c, &(struct etna_inst) { + .opcode = INST_OPCODE_BRANCH, + .cond = INST_CONDITION_TRUE, + .src[0] = src[0], + /* imm is filled in later */ + }); + + label_place(c, f->lbl_loop_end); +} + +static void +trans_brk(const struct instr_translater *t, struct etna_compile *c, + const struct tgsi_full_instruction *inst, struct etna_inst_src *src) +{ + assert(c->frame_sp > 0); + struct etna_compile_frame *f = find_frame(c, ETNA_COMPILE_FRAME_LOOP); + + /* mark position in instruction stream of label reference so that it can be + * filled in in next pass */ + label_mark_use(c, f->lbl_loop_end); + + /* create branch to loop_end label */ + emit_inst(c, &(struct etna_inst) { + .opcode = INST_OPCODE_BRANCH, + .cond = INST_CONDITION_TRUE, + .src[0] = src[0], + /* imm is filled in later */ + }); +} + +static void +trans_cont(const struct instr_translater *t, struct etna_compile *c, + const struct tgsi_full_instruction *inst, struct etna_inst_src *src) +{ + assert(c->frame_sp > 0); + struct etna_compile_frame *f = find_frame(c, ETNA_COMPILE_FRAME_LOOP); + + /* mark position in instruction stream of label reference so that it can be + * filled in in next pass */ + label_mark_use(c, f->lbl_loop_bgn); + + /* create branch to loop_end label */ + emit_inst(c, &(struct etna_inst) { + .opcode = INST_OPCODE_BRANCH, + .cond = INST_CONDITION_TRUE, + .src[0] = src[0], + /* imm is filled in later */ + }); +} + +static void +trans_deriv(const struct instr_translater *t, struct etna_compile *c, + const struct tgsi_full_instruction *inst, struct etna_inst_src *src) +{ + emit_inst(c, &(struct etna_inst) { + .opcode = t->opc, + .sat = inst->Instruction.Saturate, + .dst = convert_dst(c, &inst->Dst[0]), + .src[0] = src[0], + .src[2] = src[0], + }); +} + +static void +trans_arl(const struct instr_translater *t, struct etna_compile *c, + const struct tgsi_full_instruction *inst, struct etna_inst_src *src) +{ + struct etna_native_reg temp = etna_compile_get_inner_temp(c); + struct etna_inst arl = { }; + struct etna_inst_dst dst; + + dst = etna_native_to_dst(temp, INST_COMPS_X | INST_COMPS_Y | INST_COMPS_Z | + INST_COMPS_W); + + if (c->specs->has_sign_floor_ceil) { + struct etna_inst floor = { }; + + floor.opcode = INST_OPCODE_FLOOR; + floor.src[2] = src[0]; + floor.dst = dst; + + emit_inst(c, &floor); + } else { + struct etna_inst floor[2] = { }; + + floor[0].opcode = INST_OPCODE_FRC; + floor[0].sat = inst->Instruction.Saturate; + floor[0].dst = dst; + floor[0].src[2] = src[0]; + + floor[1].opcode = INST_OPCODE_ADD; + floor[1].sat = inst->Instruction.Saturate; + floor[1].dst = dst; + floor[1].src[0] = src[0]; + floor[1].src[2].use = 1; + floor[1].src[2].swiz = INST_SWIZ_IDENTITY; + floor[1].src[2].neg = 1; + floor[1].src[2].rgroup = temp.rgroup; + floor[1].src[2].reg = temp.id; + + emit_inst(c, &floor[0]); + emit_inst(c, &floor[1]); + } + + arl.opcode = INST_OPCODE_MOVAR; + arl.sat = inst->Instruction.Saturate; + arl.dst = convert_dst(c, &inst->Dst[0]); + arl.src[2] = etna_native_to_src(temp, INST_SWIZ_IDENTITY); + + emit_inst(c, &arl); +} + +static void +trans_lrp(const struct instr_translater *t, struct etna_compile *c, + const struct tgsi_full_instruction *inst, struct etna_inst_src *src) +{ + /* dst = src0 * src1 + (1 - src0) * src2 + * => src0 * src1 - (src0 - 1) * src2 + * => src0 * src1 - (src0 * src2 - src2) + * MAD tTEMP.xyzw, tSRC0.xyzw, tSRC2.xyzw, -tSRC2.xyzw + * MAD tDST.xyzw, tSRC0.xyzw, tSRC1.xyzw, -tTEMP.xyzw + */ + struct etna_native_reg temp = etna_compile_get_inner_temp(c); + if (etna_src_uniforms_conflict(src[0], src[1]) || + etna_src_uniforms_conflict(src[0], src[2])) { + src[0] = etna_mov_src(c, src[0]); + } + + struct etna_inst mad[2] = { }; + mad[0].opcode = INST_OPCODE_MAD; + mad[0].sat = 0; + mad[0].dst = etna_native_to_dst(temp, INST_COMPS_X | INST_COMPS_Y | + INST_COMPS_Z | INST_COMPS_W); + mad[0].src[0] = src[0]; + mad[0].src[1] = src[2]; + mad[0].src[2] = negate(src[2]); + mad[1].opcode = INST_OPCODE_MAD; + mad[1].sat = inst->Instruction.Saturate; + mad[1].dst = convert_dst(c, &inst->Dst[0]), mad[1].src[0] = src[0]; + mad[1].src[1] = src[1]; + mad[1].src[2] = negate(etna_native_to_src(temp, INST_SWIZ_IDENTITY)); + + emit_inst(c, &mad[0]); + emit_inst(c, &mad[1]); +} + +static void +trans_lit(const struct instr_translater *t, struct etna_compile *c, + const struct tgsi_full_instruction *inst, struct etna_inst_src *src) +{ + /* SELECT.LT tmp._y__, 0, src.yyyy, 0 + * - can be eliminated if src.y is a uniform and >= 0 + * SELECT.GT tmp.___w, 128, src.wwww, 128 + * SELECT.LT tmp.___w, -128, tmp.wwww, -128 + * - can be eliminated if src.w is a uniform and fits clamp + * LOG tmp.x, void, void, tmp.yyyy + * MUL tmp.x, tmp.xxxx, tmp.wwww, void + * LITP dst, undef, src.xxxx, tmp.xxxx + */ + struct etna_native_reg inner_temp = etna_compile_get_inner_temp(c); + struct etna_inst_src src_y = { }; + + if (!etna_rgroup_is_uniform(src[0].rgroup)) { + src_y = etna_native_to_src(inner_temp, SWIZZLE(Y, Y, Y, Y)); + + struct etna_inst ins = { }; + ins.opcode = INST_OPCODE_SELECT; + ins.cond = INST_CONDITION_LT; + ins.dst = etna_native_to_dst(inner_temp, INST_COMPS_Y); + ins.src[0] = ins.src[2] = alloc_imm_f32(c, 0.0); + ins.src[1] = swizzle(src[0], SWIZZLE(Y, Y, Y, Y)); + emit_inst(c, &ins); + } else if (uif(get_imm_u32(c, &src[0], 1)) < 0) + src_y = alloc_imm_f32(c, 0.0); + else + src_y = swizzle(src[0], SWIZZLE(Y, Y, Y, Y)); + + struct etna_inst_src src_w = { }; + + if (!etna_rgroup_is_uniform(src[0].rgroup)) { + src_w = etna_native_to_src(inner_temp, SWIZZLE(W, W, W, W)); + + struct etna_inst ins = { }; + ins.opcode = INST_OPCODE_SELECT; + ins.cond = INST_CONDITION_GT; + ins.dst = etna_native_to_dst(inner_temp, INST_COMPS_W); + ins.src[0] = ins.src[2] = alloc_imm_f32(c, 128.); + ins.src[1] = swizzle(src[0], SWIZZLE(W, W, W, W)); + emit_inst(c, &ins); + ins.cond = INST_CONDITION_LT; + ins.src[0].neg = !ins.src[0].neg; + ins.src[2].neg = !ins.src[2].neg; + ins.src[1] = src_w; + emit_inst(c, &ins); + } else if (uif(get_imm_u32(c, &src[0], 3)) < -128.) + src_w = alloc_imm_f32(c, -128.); + else if (uif(get_imm_u32(c, &src[0], 3)) > 128.) + src_w = alloc_imm_f32(c, 128.); + else + src_w = swizzle(src[0], SWIZZLE(W, W, W, W)); + + struct etna_inst ins[3] = { }; + ins[0].opcode = INST_OPCODE_LOG; + ins[0].dst = etna_native_to_dst(inner_temp, INST_COMPS_X); + ins[0].src[2] = src_y; + + emit_inst(c, &ins[0]); + emit_inst(c, &(struct etna_inst) { + .opcode = INST_OPCODE_MUL, + .sat = 0, + .dst = etna_native_to_dst(inner_temp, INST_COMPS_X), + .src[0] = etna_native_to_src(inner_temp, SWIZZLE(X, X, X, X)), + .src[1] = src_w, + }); + emit_inst(c, &(struct etna_inst) { + .opcode = INST_OPCODE_LITP, + .sat = 0, + .dst = convert_dst(c, &inst->Dst[0]), + .src[0] = swizzle(src[0], SWIZZLE(X, X, X, X)), + .src[1] = swizzle(src[0], SWIZZLE(X, X, X, X)), + .src[2] = etna_native_to_src(inner_temp, SWIZZLE(X, X, X, X)), + }); +} + +static void +trans_ssg(const struct instr_translater *t, struct etna_compile *c, + const struct tgsi_full_instruction *inst, struct etna_inst_src *src) +{ + if (c->specs->has_sign_floor_ceil) { + emit_inst(c, &(struct etna_inst){ + .opcode = INST_OPCODE_SIGN, + .sat = inst->Instruction.Saturate, + .dst = convert_dst(c, &inst->Dst[0]), + .src[2] = src[0], + }); + } else { + struct etna_native_reg temp = etna_compile_get_inner_temp(c); + struct etna_inst ins[2] = { }; + + ins[0].opcode = INST_OPCODE_SET; + ins[0].cond = INST_CONDITION_NZ; + ins[0].dst = etna_native_to_dst(temp, INST_COMPS_X | INST_COMPS_Y | + INST_COMPS_Z | INST_COMPS_W); + ins[0].src[0] = src[0]; + + ins[1].opcode = INST_OPCODE_SELECT; + ins[1].cond = INST_CONDITION_LZ; + ins[1].sat = inst->Instruction.Saturate; + ins[1].dst = convert_dst(c, &inst->Dst[0]); + ins[1].src[0] = src[0]; + ins[1].src[2] = etna_native_to_src(temp, INST_SWIZ_IDENTITY); + ins[1].src[1] = negate(ins[1].src[2]); + + emit_inst(c, &ins[0]); + emit_inst(c, &ins[1]); + } +} + +static void +trans_trig(const struct instr_translater *t, struct etna_compile *c, + const struct tgsi_full_instruction *inst, struct etna_inst_src *src) +{ + if (c->specs->has_sin_cos_sqrt) { + /* TGSI lowering should deal with SCS */ + assert(inst->Instruction.Opcode != TGSI_OPCODE_SCS); + + struct etna_native_reg temp = etna_compile_get_inner_temp(c); + /* add divide by PI/2, using a temp register. GC2000 + * fails with src==dst for the trig instruction. */ + emit_inst(c, &(struct etna_inst) { + .opcode = INST_OPCODE_MUL, + .sat = 0, + .dst = etna_native_to_dst(temp, INST_COMPS_X | INST_COMPS_Y | + INST_COMPS_Z | INST_COMPS_W), + .src[0] = src[0], /* any swizzling happens here */ + .src[1] = alloc_imm_f32(c, 2.0f / M_PI), + }); + emit_inst(c, &(struct etna_inst) { + .opcode = inst->Instruction.Opcode == TGSI_OPCODE_COS + ? INST_OPCODE_COS + : INST_OPCODE_SIN, + .sat = inst->Instruction.Saturate, + .dst = convert_dst(c, &inst->Dst[0]), + .src[2] = etna_native_to_src(temp, INST_SWIZ_IDENTITY), + }); + } else { + /* Implement Nick's fast sine/cosine. Taken from: + * http://forum.devmaster.net/t/fast-and-accurate-sine-cosine/9648 + * A=(1/2*PI 0 1/2*PI 0) B=(0.75 0 0.5 0) C=(-4 4 X X) + * MAD t.x_zw, src.xxxx, A, B + * FRC t.x_z_, void, void, t.xwzw + * MAD t.x_z_, t.xwzw, 2, -1 + * MUL t._y__, t.wzww, |t.wzww|, void (for sin/scs) + * DP3 t.x_z_, t.zyww, C, void (for sin) + * DP3 t.__z_, t.zyww, C, void (for scs) + * MUL t._y__, t.wxww, |t.wxww|, void (for cos/scs) + * DP3 t.x_z_, t.xyww, C, void (for cos) + * DP3 t.x___, t.xyww, C, void (for scs) + * MAD t._y_w, t,xxzz, |t.xxzz|, -t.xxzz + * MAD dst, t.ywyw, .2225, t.xzxz + * + * TODO: we don't set dst.zw correctly for SCS. + */ + struct etna_inst *p, ins[9] = { }; + struct etna_native_reg t0 = etna_compile_get_inner_temp(c); + struct etna_inst_src t0s = etna_native_to_src(t0, INST_SWIZ_IDENTITY); + struct etna_inst_src sincos[3], in = src[0]; + sincos[0] = etna_imm_vec4f(c, sincos_const[0]); + sincos[1] = etna_imm_vec4f(c, sincos_const[1]); + + /* A uniform source will cause the inner temp limit to + * be exceeded. Explicitly deal with that scenario. + */ + if (etna_rgroup_is_uniform(src[0].rgroup)) { + struct etna_inst ins = { }; + ins.opcode = INST_OPCODE_MOV; + ins.dst = etna_native_to_dst(t0, INST_COMPS_X); + ins.src[2] = in; + emit_inst(c, &ins); + in = t0s; + } + + ins[0].opcode = INST_OPCODE_MAD; + ins[0].dst = etna_native_to_dst(t0, INST_COMPS_X | INST_COMPS_Z | INST_COMPS_W); + ins[0].src[0] = swizzle(in, SWIZZLE(X, X, X, X)); + ins[0].src[1] = swizzle(sincos[1], SWIZZLE(X, W, X, W)); /* 1/2*PI */ + ins[0].src[2] = swizzle(sincos[1], SWIZZLE(Y, W, Z, W)); /* 0.75, 0, 0.5, 0 */ + + ins[1].opcode = INST_OPCODE_FRC; + ins[1].dst = etna_native_to_dst(t0, INST_COMPS_X | INST_COMPS_Z); + ins[1].src[2] = swizzle(t0s, SWIZZLE(X, W, Z, W)); + + ins[2].opcode = INST_OPCODE_MAD; + ins[2].dst = etna_native_to_dst(t0, INST_COMPS_X | INST_COMPS_Z); + ins[2].src[0] = swizzle(t0s, SWIZZLE(X, W, Z, W)); + ins[2].src[1] = swizzle(sincos[0], SWIZZLE(X, X, X, X)); /* 2 */ + ins[2].src[2] = swizzle(sincos[0], SWIZZLE(Y, Y, Y, Y)); /* -1 */ + + unsigned mul_swiz, dp3_swiz; + if (inst->Instruction.Opcode == TGSI_OPCODE_SIN) { + mul_swiz = SWIZZLE(W, Z, W, W); + dp3_swiz = SWIZZLE(Z, Y, W, W); + } else { + mul_swiz = SWIZZLE(W, X, W, W); + dp3_swiz = SWIZZLE(X, Y, W, W); + } + + ins[3].opcode = INST_OPCODE_MUL; + ins[3].dst = etna_native_to_dst(t0, INST_COMPS_Y); + ins[3].src[0] = swizzle(t0s, mul_swiz); + ins[3].src[1] = absolute(ins[3].src[0]); + + ins[4].opcode = INST_OPCODE_DP3; + ins[4].dst = etna_native_to_dst(t0, INST_COMPS_X | INST_COMPS_Z); + ins[4].src[0] = swizzle(t0s, dp3_swiz); + ins[4].src[1] = swizzle(sincos[0], SWIZZLE(Z, W, W, W)); + + if (inst->Instruction.Opcode == TGSI_OPCODE_SCS) { + ins[5] = ins[3]; + ins[6] = ins[4]; + ins[4].dst.comps = INST_COMPS_X; + ins[6].dst.comps = INST_COMPS_Z; + ins[5].src[0] = swizzle(t0s, SWIZZLE(W, Z, W, W)); + ins[6].src[0] = swizzle(t0s, SWIZZLE(Z, Y, W, W)); + ins[5].src[1] = absolute(ins[5].src[0]); + p = &ins[7]; + } else { + p = &ins[5]; + } + + p->opcode = INST_OPCODE_MAD; + p->dst = etna_native_to_dst(t0, INST_COMPS_Y | INST_COMPS_W); + p->src[0] = swizzle(t0s, SWIZZLE(X, X, Z, Z)); + p->src[1] = absolute(p->src[0]); + p->src[2] = negate(p->src[0]); + + p++; + p->opcode = INST_OPCODE_MAD; + p->sat = inst->Instruction.Saturate; + p->dst = convert_dst(c, &inst->Dst[0]), + p->src[0] = swizzle(t0s, SWIZZLE(Y, W, Y, W)); + p->src[1] = alloc_imm_f32(c, 0.2225); + p->src[2] = swizzle(t0s, SWIZZLE(X, Z, X, Z)); + + for (int i = 0; &ins[i] <= p; i++) + emit_inst(c, &ins[i]); + } +} + +static void +trans_dph(const struct instr_translater *t, struct etna_compile *c, + const struct tgsi_full_instruction *inst, struct etna_inst_src *src) +{ + /* + DP3 tmp.xyzw, src0.xyzw, src1,xyzw, void + ADD dst.xyzw, tmp.xyzw, void, src1.wwww + */ + struct etna_native_reg temp = etna_compile_get_inner_temp(c); + struct etna_inst ins[2] = { }; + + ins[0].opcode = INST_OPCODE_DP3; + ins[0].dst = etna_native_to_dst(temp, INST_COMPS_X | INST_COMPS_Y | + INST_COMPS_Z | INST_COMPS_W); + ins[0].src[0] = src[0]; + ins[0].src[1] = src[1]; + + ins[1].opcode = INST_OPCODE_ADD; + ins[1].sat = inst->Instruction.Saturate; + ins[1].dst = convert_dst(c, &inst->Dst[0]); + ins[1].src[0] = etna_native_to_src(temp, INST_SWIZ_IDENTITY); + ins[1].src[2] = swizzle(src[1], SWIZZLE(W, W, W, W)); + + emit_inst(c, &ins[0]); + emit_inst(c, &ins[1]); +} + +static void +trans_sampler(const struct instr_translater *t, struct etna_compile *c, + const struct tgsi_full_instruction *inst, + struct etna_inst_src *src) +{ + /* There is no native support for GL texture rectangle coordinates, so + * we have to rescale from ([0, width], [0, height]) to ([0, 1], [0, 1]). */ + if (inst->Texture.Texture == TGSI_TEXTURE_RECT) { + uint32_t unit = inst->Src[1].Register.Index; + struct etna_inst ins[2] = { }; + struct etna_native_reg temp = etna_compile_get_inner_temp(c); + + ins[0].opcode = INST_OPCODE_MUL; + ins[0].dst = etna_native_to_dst(temp, INST_COMPS_X); + ins[0].src[0] = src[0]; + ins[0].src[1] = alloc_imm(c, ETNA_IMMEDIATE_TEXRECT_SCALE_X, unit); + + ins[1].opcode = INST_OPCODE_MUL; + ins[1].dst = etna_native_to_dst(temp, INST_COMPS_Y); + ins[1].src[0] = src[0]; + ins[1].src[1] = alloc_imm(c, ETNA_IMMEDIATE_TEXRECT_SCALE_Y, unit); + + emit_inst(c, &ins[0]); + emit_inst(c, &ins[1]); + + src[0] = etna_native_to_src(temp, INST_SWIZ_IDENTITY); /* temp.xyzw */ + } + + switch (inst->Instruction.Opcode) { + case TGSI_OPCODE_TEX: + emit_inst(c, &(struct etna_inst) { + .opcode = INST_OPCODE_TEXLD, + .sat = 0, + .dst = convert_dst(c, &inst->Dst[0]), + .tex = convert_tex(c, &inst->Src[1], &inst->Texture), + .src[0] = src[0], + }); + break; + + case TGSI_OPCODE_TXB: + emit_inst(c, &(struct etna_inst) { + .opcode = INST_OPCODE_TEXLDB, + .sat = 0, + .dst = convert_dst(c, &inst->Dst[0]), + .tex = convert_tex(c, &inst->Src[1], &inst->Texture), + .src[0] = src[0], + }); + break; + + case TGSI_OPCODE_TXL: + emit_inst(c, &(struct etna_inst) { + .opcode = INST_OPCODE_TEXLDL, + .sat = 0, + .dst = convert_dst(c, &inst->Dst[0]), + .tex = convert_tex(c, &inst->Src[1], &inst->Texture), + .src[0] = src[0], + }); + break; + + case TGSI_OPCODE_TXP: { /* divide src.xyz by src.w */ + struct etna_native_reg temp = etna_compile_get_inner_temp(c); + + emit_inst(c, &(struct etna_inst) { + .opcode = INST_OPCODE_RCP, + .sat = 0, + .dst = etna_native_to_dst(temp, INST_COMPS_W), /* tmp.w */ + .src[2] = swizzle(src[0], SWIZZLE(W, W, W, W)), + }); + emit_inst(c, &(struct etna_inst) { + .opcode = INST_OPCODE_MUL, + .sat = 0, + .dst = etna_native_to_dst(temp, INST_COMPS_X | INST_COMPS_Y | + INST_COMPS_Z), /* tmp.xyz */ + .src[0] = etna_native_to_src(temp, SWIZZLE(W, W, W, W)), + .src[1] = src[0], /* src.xyzw */ + }); + emit_inst(c, &(struct etna_inst) { + .opcode = INST_OPCODE_TEXLD, + .sat = 0, + .dst = convert_dst(c, &inst->Dst[0]), + .tex = convert_tex(c, &inst->Src[1], &inst->Texture), + .src[0] = etna_native_to_src(temp, INST_SWIZ_IDENTITY), /* tmp.xyzw */ + }); + } break; + + default: + BUG("Unhandled instruction %s", + tgsi_get_opcode_name(inst->Instruction.Opcode)); + assert(0); + break; + } +} + +static void +trans_dummy(const struct instr_translater *t, struct etna_compile *c, + const struct tgsi_full_instruction *inst, struct etna_inst_src *src) +{ + /* nothing to do */ +} + +static const struct instr_translater translaters[TGSI_OPCODE_LAST] = { +#define INSTR(n, f, ...) \ + [TGSI_OPCODE_##n] = {.fxn = (f), .tgsi_opc = TGSI_OPCODE_##n, ##__VA_ARGS__} + + INSTR(MOV, trans_instr, .opc = INST_OPCODE_MOV, .src = {2, -1, -1}), + INSTR(RCP, trans_instr, .opc = INST_OPCODE_RCP, .src = {2, -1, -1}), + INSTR(RSQ, trans_instr, .opc = INST_OPCODE_RSQ, .src = {2, -1, -1}), + INSTR(MUL, trans_instr, .opc = INST_OPCODE_MUL, .src = {0, 1, -1}), + INSTR(ADD, trans_instr, .opc = INST_OPCODE_ADD, .src = {0, 2, -1}), + INSTR(DP3, trans_instr, .opc = INST_OPCODE_DP3, .src = {0, 1, -1}), + INSTR(DP4, trans_instr, .opc = INST_OPCODE_DP4, .src = {0, 1, -1}), + INSTR(DST, trans_instr, .opc = INST_OPCODE_DST, .src = {0, 1, -1}), + INSTR(MAD, trans_instr, .opc = INST_OPCODE_MAD, .src = {0, 1, 2}), + INSTR(EX2, trans_instr, .opc = INST_OPCODE_EXP, .src = {2, -1, -1}), + INSTR(LG2, trans_instr, .opc = INST_OPCODE_LOG, .src = {2, -1, -1}), + INSTR(SQRT, trans_instr, .opc = INST_OPCODE_SQRT, .src = {2, -1, -1}), + INSTR(FRC, trans_instr, .opc = INST_OPCODE_FRC, .src = {2, -1, -1}), + INSTR(CEIL, trans_instr, .opc = INST_OPCODE_CEIL, .src = {2, -1, -1}), + INSTR(FLR, trans_instr, .opc = INST_OPCODE_FLOOR, .src = {2, -1, -1}), + INSTR(CMP, trans_instr, .opc = INST_OPCODE_SELECT, .src = {0, 1, 2}, .cond = INST_CONDITION_LZ), + + INSTR(KILL, trans_instr, .opc = INST_OPCODE_TEXKILL), + INSTR(KILL_IF, trans_instr, .opc = INST_OPCODE_TEXKILL, .src = {0, -1, -1}, .cond = INST_CONDITION_LZ), + + INSTR(DDX, trans_deriv, .opc = INST_OPCODE_DSX), + INSTR(DDY, trans_deriv, .opc = INST_OPCODE_DSY), + + INSTR(IF, trans_if), + INSTR(ELSE, trans_else), + INSTR(ENDIF, trans_endif), + + INSTR(BGNLOOP, trans_loop_bgn), + INSTR(ENDLOOP, trans_loop_end), + INSTR(BRK, trans_brk), + INSTR(CONT, trans_cont), + + INSTR(MIN, trans_min_max, .opc = INST_OPCODE_SELECT, .cond = INST_CONDITION_GT), + INSTR(MAX, trans_min_max, .opc = INST_OPCODE_SELECT, .cond = INST_CONDITION_LT), + + INSTR(ARL, trans_arl), + INSTR(LRP, trans_lrp), + INSTR(LIT, trans_lit), + INSTR(SSG, trans_ssg), + INSTR(DPH, trans_dph), + + INSTR(SIN, trans_trig), + INSTR(COS, trans_trig), + INSTR(SCS, trans_trig), + + INSTR(SLT, trans_instr, .opc = INST_OPCODE_SET, .src = {0, 1, -1}, .cond = INST_CONDITION_LT), + INSTR(SGE, trans_instr, .opc = INST_OPCODE_SET, .src = {0, 1, -1}, .cond = INST_CONDITION_GE), + INSTR(SEQ, trans_instr, .opc = INST_OPCODE_SET, .src = {0, 1, -1}, .cond = INST_CONDITION_EQ), + INSTR(SGT, trans_instr, .opc = INST_OPCODE_SET, .src = {0, 1, -1}, .cond = INST_CONDITION_GT), + INSTR(SLE, trans_instr, .opc = INST_OPCODE_SET, .src = {0, 1, -1}, .cond = INST_CONDITION_LE), + INSTR(SNE, trans_instr, .opc = INST_OPCODE_SET, .src = {0, 1, -1}, .cond = INST_CONDITION_NE), + + INSTR(TEX, trans_sampler), + INSTR(TXB, trans_sampler), + INSTR(TXL, trans_sampler), + INSTR(TXP, trans_sampler), + + INSTR(NOP, trans_dummy), + INSTR(END, trans_dummy), +}; + +/* Pass -- compile instructions */ +static void +etna_compile_pass_generate_code(struct etna_compile *c) +{ + struct tgsi_parse_context ctx = { }; + unsigned status = tgsi_parse_init(&ctx, c->tokens); + assert(status == TGSI_PARSE_OK); + + int inst_idx = 0; + while (!tgsi_parse_end_of_tokens(&ctx)) { + const struct tgsi_full_instruction *inst = 0; + + /* No inner temps used yet for this instruction, clear counter */ + c->inner_temps = 0; + + tgsi_parse_token(&ctx); + + switch (ctx.FullToken.Token.Type) { + case TGSI_TOKEN_TYPE_INSTRUCTION: + /* iterate over operands */ + inst = &ctx.FullToken.FullInstruction; + if (c->dead_inst[inst_idx]) { /* skip dead instructions */ + inst_idx++; + continue; + } + + /* Lookup the TGSI information and generate the source arguments */ + struct etna_inst_src src[ETNA_NUM_SRC]; + memset(src, 0, sizeof(src)); + + const struct tgsi_opcode_info *tgsi = tgsi_get_opcode_info(inst->Instruction.Opcode); + + for (int i = 0; i < tgsi->num_src && i < ETNA_NUM_SRC; i++) { + const struct tgsi_full_src_register *reg = &inst->Src[i]; + const struct etna_native_reg *n = &etna_get_src_reg(c, reg->Register)->native; + + if (!n->valid || n->is_tex) + continue; + + src[i] = etna_create_src(reg, n); + } + + const unsigned opc = inst->Instruction.Opcode; + const struct instr_translater *t = &translaters[opc]; + + if (t->fxn) { + t->fxn(t, c, inst, src); + + inst_idx += 1; + } else { + BUG("Unhandled instruction %s", tgsi_get_opcode_name(opc)); + assert(0); + } + break; + } + } + tgsi_parse_free(&ctx); +} + +/* Look up register by semantic */ +static struct etna_reg_desc * +find_decl_by_semantic(struct etna_compile *c, uint file, uint name, uint index) +{ + for (int idx = 0; idx < c->file[file].reg_size; ++idx) { + struct etna_reg_desc *reg = &c->file[file].reg[idx]; + + if (reg->semantic.Name == name && reg->semantic.Index == index) + return reg; + } + + return NULL; /* not found */ +} + +/** Add ADD and MUL instruction to bring Z/W to 0..1 if -1..1 if needed: + * - this is a vertex shader + * - and this is an older GPU + */ +static void +etna_compile_add_z_div_if_needed(struct etna_compile *c) +{ + if (c->info.processor == PIPE_SHADER_VERTEX && c->specs->vs_need_z_div) { + /* find position out */ + struct etna_reg_desc *pos_reg = + find_decl_by_semantic(c, TGSI_FILE_OUTPUT, TGSI_SEMANTIC_POSITION, 0); + + if (pos_reg != NULL) { + /* + * ADD tX.__z_, tX.zzzz, void, tX.wwww + * MUL tX.__z_, tX.zzzz, 0.5, void + */ + emit_inst(c, &(struct etna_inst) { + .opcode = INST_OPCODE_ADD, + .dst = etna_native_to_dst(pos_reg->native, INST_COMPS_Z), + .src[0] = etna_native_to_src(pos_reg->native, SWIZZLE(Z, Z, Z, Z)), + .src[2] = etna_native_to_src(pos_reg->native, SWIZZLE(W, W, W, W)), + }); + emit_inst(c, &(struct etna_inst) { + .opcode = INST_OPCODE_MUL, + .dst = etna_native_to_dst(pos_reg->native, INST_COMPS_Z), + .src[0] = etna_native_to_src(pos_reg->native, SWIZZLE(Z, Z, Z, Z)), + .src[1] = alloc_imm_f32(c, 0.5f), + }); + } + } +} + +/** add a NOP to the shader if + * a) the shader is empty + * or + * b) there is a label at the end of the shader + */ +static void +etna_compile_add_nop_if_needed(struct etna_compile *c) +{ + bool label_at_last_inst = false; + + for (int idx = 0; idx < c->labels_count; ++idx) { + if (c->labels[idx].inst_idx == c->inst_ptr) + label_at_last_inst = true; + + } + + if (c->inst_ptr == 0 || label_at_last_inst) + emit_inst(c, &(struct etna_inst){.opcode = INST_OPCODE_NOP}); +} + +static void +assign_uniforms(struct etna_compile_file *file, unsigned base) +{ + for (int idx = 0; idx < file->reg_size; ++idx) { + file->reg[idx].native.valid = 1; + file->reg[idx].native.rgroup = INST_RGROUP_UNIFORM_0; + file->reg[idx].native.id = base + idx; + } +} + +/* Allocate CONST and IMM to native ETNA_RGROUP_UNIFORM(x). + * CONST must be consecutive as const buffers are supposed to be consecutive, + * and before IMM, as this is + * more convenient because is possible for the compilation process itself to + * generate extra + * immediates for constants such as pi, one, zero. + */ +static void +assign_constants_and_immediates(struct etna_compile *c) +{ + assign_uniforms(&c->file[TGSI_FILE_CONSTANT], 0); + /* immediates start after the constants */ + c->imm_base = c->file[TGSI_FILE_CONSTANT].reg_size * 4; + assign_uniforms(&c->file[TGSI_FILE_IMMEDIATE], c->imm_base / 4); + DBG_F(ETNA_DBG_COMPILER_MSGS, "imm base: %i size: %i", c->imm_base, + c->imm_size); +} + +/* Assign declared samplers to native texture units */ +static void +assign_texture_units(struct etna_compile *c) +{ + uint tex_base = 0; + + if (c->info.processor == PIPE_SHADER_VERTEX) + tex_base = c->specs->vertex_sampler_offset; + + for (int idx = 0; idx < c->file[TGSI_FILE_SAMPLER].reg_size; ++idx) { + c->file[TGSI_FILE_SAMPLER].reg[idx].native.valid = 1; + c->file[TGSI_FILE_SAMPLER].reg[idx].native.is_tex = 1; // overrides rgroup + c->file[TGSI_FILE_SAMPLER].reg[idx].native.id = tex_base + idx; + } +} + +/* Additional pass to fill in branch targets. This pass should be last + * as no instruction reordering or removing/addition can be done anymore + * once the branch targets are computed. + */ +static void +etna_compile_fill_in_labels(struct etna_compile *c) +{ + for (int idx = 0; idx < c->inst_ptr; ++idx) { + if (c->lbl_usage[idx]) + etna_assemble_set_imm(&c->code[idx * 4], c->lbl_usage[idx]->inst_idx); + } +} + +/* compare two etna_native_reg structures, return true if equal */ +static bool +cmp_etna_native_reg(const struct etna_native_reg to, + const struct etna_native_reg from) +{ + return to.valid == from.valid && to.is_tex == from.is_tex && + to.rgroup == from.rgroup && to.id == from.id; +} + +/* go through all declarations and swap native registers *to* and *from* */ +static void +swap_native_registers(struct etna_compile *c, const struct etna_native_reg to, + const struct etna_native_reg from) +{ + if (cmp_etna_native_reg(from, to)) + return; /* Nothing to do */ + + for (int idx = 0; idx < c->total_decls; ++idx) { + if (cmp_etna_native_reg(c->decl[idx].native, from)) { + c->decl[idx].native = to; + } else if (cmp_etna_native_reg(c->decl[idx].native, to)) { + c->decl[idx].native = from; + } + } +} + +/* For PS we need to permute so that inputs are always in temporary 0..N-1. + * Semantic POS is always t0. If that semantic is not used, avoid t0. + */ +static void +permute_ps_inputs(struct etna_compile *c) +{ + /* Special inputs: + * gl_FragCoord VARYING_SLOT_POS TGSI_SEMANTIC_POSITION + * gl_PointCoord VARYING_SLOT_PNTC TGSI_SEMANTIC_PCOORD + */ + uint native_idx = 1; + + for (int idx = 0; idx < c->file[TGSI_FILE_INPUT].reg_size; ++idx) { + struct etna_reg_desc *reg = &c->file[TGSI_FILE_INPUT].reg[idx]; + uint input_id; + assert(reg->has_semantic); + + if (!reg->active || reg->semantic.Name == TGSI_SEMANTIC_POSITION) + continue; + + input_id = native_idx++; + swap_native_registers(c, etna_native_temp(input_id), + c->file[TGSI_FILE_INPUT].reg[idx].native); + } + + c->num_varyings = native_idx - 1; + + if (native_idx > c->next_free_native) + c->next_free_native = native_idx; +} + +/* fill in ps inputs into shader object */ +static void +fill_in_ps_inputs(struct etna_shader *sobj, struct etna_compile *c) +{ + struct etna_shader_io_file *sf = &sobj->infile; + + sf->num_reg = 0; + + for (int idx = 0; idx < c->file[TGSI_FILE_INPUT].reg_size; ++idx) { + struct etna_reg_desc *reg = &c->file[TGSI_FILE_INPUT].reg[idx]; + + if (reg->native.id > 0) { + assert(sf->num_reg < ETNA_NUM_INPUTS); + sf->reg[sf->num_reg].reg = reg->native.id; + sf->reg[sf->num_reg].semantic = reg->semantic; + /* convert usage mask to number of components (*=wildcard) + * .r (0..1) -> 1 component + * .*g (2..3) -> 2 component + * .**b (4..7) -> 3 components + * .***a (8..15) -> 4 components + */ + sf->reg[sf->num_reg].num_components = util_last_bit(reg->usage_mask); + sf->num_reg++; + } + } + + assert(sf->num_reg == c->num_varyings); + sobj->input_count_unk8 = 31; /* XXX what is this */ +} + +/* fill in output mapping for ps into shader object */ +static void +fill_in_ps_outputs(struct etna_shader *sobj, struct etna_compile *c) +{ + sobj->outfile.num_reg = 0; + + for (int idx = 0; idx < c->file[TGSI_FILE_OUTPUT].reg_size; ++idx) { + struct etna_reg_desc *reg = &c->file[TGSI_FILE_OUTPUT].reg[idx]; + + switch (reg->semantic.Name) { + case TGSI_SEMANTIC_COLOR: /* FRAG_RESULT_COLOR */ + sobj->ps_color_out_reg = reg->native.id; + break; + case TGSI_SEMANTIC_POSITION: /* FRAG_RESULT_DEPTH */ + sobj->ps_depth_out_reg = reg->native.id; /* =always native reg 0, only z component should be assigned */ + break; + default: + assert(0); /* only outputs supported are COLOR and POSITION at the moment */ + } + } +} + +/* fill in inputs for vs into shader object */ +static void +fill_in_vs_inputs(struct etna_shader *sobj, struct etna_compile *c) +{ + struct etna_shader_io_file *sf = &sobj->infile; + + sf->num_reg = 0; + for (int idx = 0; idx < c->file[TGSI_FILE_INPUT].reg_size; ++idx) { + struct etna_reg_desc *reg = &c->file[TGSI_FILE_INPUT].reg[idx]; + assert(sf->num_reg < ETNA_NUM_INPUTS); + /* XXX exclude inputs with special semantics such as gl_frontFacing */ + sf->reg[sf->num_reg].reg = reg->native.id; + sf->reg[sf->num_reg].semantic = reg->semantic; + sf->reg[sf->num_reg].num_components = util_last_bit(reg->usage_mask); + sf->num_reg++; + } + + sobj->input_count_unk8 = (sf->num_reg + 19) / 16; /* XXX what is this */ +} + +/* build two-level output index [Semantic][Index] for fast linking */ +static void +build_output_index(struct etna_shader *sobj) +{ + int total = 0; + int offset = 0; + + for (int name = 0; name < TGSI_SEMANTIC_COUNT; ++name) + total += sobj->output_count_per_semantic[name]; + + sobj->output_per_semantic_list = CALLOC(total, sizeof(struct etna_shader_inout *)); + + for (int name = 0; name < TGSI_SEMANTIC_COUNT; ++name) { + sobj->output_per_semantic[name] = &sobj->output_per_semantic_list[offset]; + offset += sobj->output_count_per_semantic[name]; + } + + for (int idx = 0; idx < sobj->outfile.num_reg; ++idx) { + sobj->output_per_semantic[sobj->outfile.reg[idx].semantic.Name] + [sobj->outfile.reg[idx].semantic.Index] = + &sobj->outfile.reg[idx]; + } +} + +/* fill in outputs for vs into shader object */ +static void +fill_in_vs_outputs(struct etna_shader *sobj, struct etna_compile *c) +{ + struct etna_shader_io_file *sf = &sobj->outfile; + + sf->num_reg = 0; + for (int idx = 0; idx < c->file[TGSI_FILE_OUTPUT].reg_size; ++idx) { + struct etna_reg_desc *reg = &c->file[TGSI_FILE_OUTPUT].reg[idx]; + assert(sf->num_reg < ETNA_NUM_INPUTS); + + switch (reg->semantic.Name) { + case TGSI_SEMANTIC_POSITION: + sobj->vs_pos_out_reg = reg->native.id; + break; + case TGSI_SEMANTIC_PSIZE: + sobj->vs_pointsize_out_reg = reg->native.id; + break; + default: + sf->reg[sf->num_reg].reg = reg->native.id; + sf->reg[sf->num_reg].semantic = reg->semantic; + sf->reg[sf->num_reg].num_components = 4; // XXX reg->num_components; + sf->num_reg++; + sobj->output_count_per_semantic[reg->semantic.Name] = + MAX2(reg->semantic.Index + 1, + sobj->output_count_per_semantic[reg->semantic.Name]); + } + } + + /* build two-level index for linking */ + build_output_index(sobj); + + /* fill in "mystery meat" load balancing value. This value determines how + * work is scheduled between VS and PS + * in the unified shader architecture. More precisely, it is determined from + * the number of VS outputs, as well as chip-specific + * vertex output buffer size, vertex cache size, and the number of shader + * cores. + * + * XXX this is a conservative estimate, the "optimal" value is only known for + * sure at link time because some + * outputs may be unused and thus unmapped. Then again, in the general use + * case with GLSL the vertex and fragment + * shaders are linked already before submitting to Gallium, thus all outputs + * are used. + */ + int half_out = (c->file[TGSI_FILE_OUTPUT].reg_size + 1) / 2; + assert(half_out); + + uint32_t b = ((20480 / (c->specs->vertex_output_buffer_size - + 2 * half_out * c->specs->vertex_cache_size)) + + 9) / + 10; + uint32_t a = (b + 256 / (c->specs->shader_core_count * half_out)) / 2; + sobj->vs_load_balancing = VIVS_VS_LOAD_BALANCING_A(MIN2(a, 255)) | + VIVS_VS_LOAD_BALANCING_B(MIN2(b, 255)) | + VIVS_VS_LOAD_BALANCING_C(0x3f) | + VIVS_VS_LOAD_BALANCING_D(0x0f); +} + +static bool +etna_compile_check_limits(struct etna_compile *c) +{ + int max_uniforms = (c->info.processor == PIPE_SHADER_VERTEX) + ? c->specs->max_vs_uniforms + : c->specs->max_ps_uniforms; + /* round up number of uniforms, including immediates, in units of four */ + int num_uniforms = c->imm_base / 4 + (c->imm_size + 3) / 4; + + if (c->inst_ptr > c->specs->max_instructions) { + DBG("Number of instructions (%d) exceeds maximum %d", c->inst_ptr, + c->specs->max_instructions); + return false; + } + + if (c->next_free_native > c->specs->max_registers) { + DBG("Number of registers (%d) exceeds maximum %d", c->next_free_native, + c->specs->max_registers); + return false; + } + + if (num_uniforms > max_uniforms) { + DBG("Number of uniforms (%d) exceeds maximum %d", num_uniforms, + max_uniforms); + return false; + } + + if (c->num_varyings > c->specs->max_varyings) { + DBG("Number of varyings (%d) exceeds maximum %d", c->num_varyings, + c->specs->max_varyings); + return false; + } + + if (c->imm_base > c->specs->num_constants) { + DBG("Number of constants (%d) exceeds maximum %d", c->imm_base, + c->specs->num_constants); + } + + return true; +} + +static void +copy_uniform_state_to_shader(struct etna_compile *c, struct etna_shader *sobj) +{ + uint32_t count = c->imm_size; + struct etna_shader_uniform_info *uinfo = &sobj->uniforms; + + uinfo->const_count = c->imm_base; + uinfo->imm_count = count; + uinfo->imm_data = mem_dup(c->imm_data, count * sizeof(*c->imm_data)); + uinfo->imm_contents = mem_dup(c->imm_contents, count * sizeof(*c->imm_contents)); + + etna_set_shader_uniforms_dirty_flags(sobj); +} + +struct etna_shader * +etna_compile_shader(const struct etna_specs *specs, + const struct tgsi_token *tokens) +{ + /* Create scratch space that may be too large to fit on stack + */ + bool ret; + struct etna_compile *c; + struct etna_shader *shader; + + struct tgsi_lowering_config lconfig = { + .lower_SCS = specs->has_sin_cos_sqrt, + .lower_FLR = !specs->has_sign_floor_ceil, + .lower_CEIL = !specs->has_sign_floor_ceil, + .lower_POW = true, + .lower_EXP = true, + .lower_LOG = true, + .lower_DP2 = true, + .lower_DP2A = true, + .lower_TRUNC = true, + .lower_XPD = true + }; + + c = CALLOC_STRUCT(etna_compile); + if (!c) + return NULL; + + shader = CALLOC_STRUCT(etna_shader); + if (!shader) + goto out; + + c->specs = specs; + c->tokens = tgsi_transform_lowering(&lconfig, tokens, &c->info); + c->free_tokens = !!c->tokens; + if (!c->tokens) { + /* no lowering */ + c->tokens = tokens; + } + + /* Build a map from gallium register to native registers for files + * CONST, SAMP, IMM, OUT, IN, TEMP. + * SAMP will map as-is for fragment shaders, there will be a +8 offset for + * vertex shaders. + */ + /* Pass one -- check register file declarations and immediates */ + etna_compile_parse_declarations(c); + + etna_allocate_decls(c); + + /* Pass two -- check usage of temporaries, inputs, outputs */ + etna_compile_pass_check_usage(c); + + assign_special_inputs(c); + + /* Assign native temp register to TEMPs */ + assign_temporaries_to_native(c, &c->file[TGSI_FILE_TEMPORARY]); + + /* optimize outputs */ + etna_compile_pass_optimize_outputs(c); + + /* XXX assign special inputs: gl_FrontFacing (VARYING_SLOT_FACE) + * this is part of RGROUP_INTERNAL + */ + + /* assign inputs: last usage of input should be <= first usage of temp */ + /* potential optimization case: + * if single MOV TEMP[y], IN[x] before which temp y is not used, and + * after which IN[x] + * is not read, temp[y] can be used as input register as-is + */ + /* sort temporaries by first use + * sort inputs by last usage + * iterate over inputs, temporaries + * if last usage of input <= first usage of temp: + * assign input to temp + * advance input, temporary pointer + * else + * advance temporary pointer + * + * potential problem: instruction with multiple inputs of which one is the + * temp and the other is the input; + * however, as the temp is not used before this, how would this make + * sense? uninitialized temporaries have an undefined + * value, so this would be ok + */ + assign_inouts_to_temporaries(c, TGSI_FILE_INPUT); + + /* assign outputs: first usage of output should be >= last usage of temp */ + /* potential optimization case: + * if single MOV OUT[x], TEMP[y] (with full write mask, or at least + * writing all components that are used in + * the shader) after which temp y is no longer used temp[y] can be + * used as output register as-is + * + * potential problem: instruction with multiple outputs of which one is the + * temp and the other is the output; + * however, as the temp is not used after this, how would this make + * sense? could just discard the output value + */ + /* sort temporaries by last use + * sort outputs by first usage + * iterate over outputs, temporaries + * if first usage of output >= last usage of temp: + * assign output to temp + * advance output, temporary pointer + * else + * advance temporary pointer + */ + assign_inouts_to_temporaries(c, TGSI_FILE_OUTPUT); + + assign_constants_and_immediates(c); + assign_texture_units(c); + + /* list declarations */ + for (int x = 0; x < c->total_decls; ++x) { + DBG_F(ETNA_DBG_COMPILER_MSGS, "%i: %s,%d active=%i first_use=%i " + "last_use=%i native=%i usage_mask=%x " + "has_semantic=%i", + x, tgsi_file_name(c->decl[x].file), c->decl[x].idx, + c->decl[x].active, c->decl[x].first_use, c->decl[x].last_use, + c->decl[x].native.valid ? c->decl[x].native.id : -1, + c->decl[x].usage_mask, c->decl[x].has_semantic); + if (c->decl[x].has_semantic) + DBG_F(ETNA_DBG_COMPILER_MSGS, " semantic_name=%s semantic_idx=%i", + tgsi_semantic_names[c->decl[x].semantic.Name], + c->decl[x].semantic.Index); + } + /* XXX for PS we need to permute so that inputs are always in temporary + * 0..N-1. + * There is no "switchboard" for varyings (AFAIK!). The output color, + * however, can be routed + * from an arbitrary temporary. + */ + if (c->info.processor == PIPE_SHADER_FRAGMENT) + permute_ps_inputs(c); + + + /* list declarations */ + for (int x = 0; x < c->total_decls; ++x) { + DBG_F(ETNA_DBG_COMPILER_MSGS, "%i: %s,%d active=%i first_use=%i " + "last_use=%i native=%i usage_mask=%x " + "has_semantic=%i", + x, tgsi_file_name(c->decl[x].file), c->decl[x].idx, + c->decl[x].active, c->decl[x].first_use, c->decl[x].last_use, + c->decl[x].native.valid ? c->decl[x].native.id : -1, + c->decl[x].usage_mask, c->decl[x].has_semantic); + if (c->decl[x].has_semantic) + DBG_F(ETNA_DBG_COMPILER_MSGS, " semantic_name=%s semantic_idx=%i", + tgsi_semantic_names[c->decl[x].semantic.Name], + c->decl[x].semantic.Index); + } + + /* pass 3: generate instructions */ + etna_compile_pass_generate_code(c); + etna_compile_add_z_div_if_needed(c); + etna_compile_add_nop_if_needed(c); + etna_compile_fill_in_labels(c); + + ret = etna_compile_check_limits(c); + if (!ret) { + FREE(shader); + shader = NULL; + goto out; + } + + /* fill in output structure */ + shader->processor = c->info.processor; + shader->code_size = c->inst_ptr * 4; + shader->code = mem_dup(c->code, c->inst_ptr * 16); + shader->num_temps = c->next_free_native; + shader->vs_pos_out_reg = -1; + shader->vs_pointsize_out_reg = -1; + shader->ps_color_out_reg = -1; + shader->ps_depth_out_reg = -1; + copy_uniform_state_to_shader(c, shader); + + if (c->info.processor == PIPE_SHADER_VERTEX) { + fill_in_vs_inputs(shader, c); + fill_in_vs_outputs(shader, c); + } else if (c->info.processor == PIPE_SHADER_FRAGMENT) { + fill_in_ps_inputs(shader, c); + fill_in_ps_outputs(shader, c); + } + +out: + if (c->free_tokens) + FREE((void *)c->tokens); + + FREE(c->labels); + FREE(c); + + return shader; +} + +extern const char *tgsi_swizzle_names[]; +void +etna_dump_shader(const struct etna_shader *shader) +{ + if (shader->processor == PIPE_SHADER_VERTEX) + printf("VERT\n"); + else + printf("FRAG\n"); + + + etna_disasm(shader->code, shader->code_size, PRINT_RAW); + + printf("num temps: %i\n", shader->num_temps); + printf("num const: %i\n", shader->uniforms.const_count); + printf("immediates:\n"); + for (int idx = 0; idx < shader->uniforms.imm_count; ++idx) { + printf(" [%i].%s = %f (0x%08x)\n", + (idx + shader->uniforms.const_count) / 4, + tgsi_swizzle_names[idx % 4], + *((float *)&shader->uniforms.imm_data[idx]), + shader->uniforms.imm_data[idx]); + } + printf("inputs:\n"); + for (int idx = 0; idx < shader->infile.num_reg; ++idx) { + printf(" [%i] name=%s index=%i comps=%i\n", shader->infile.reg[idx].reg, + tgsi_semantic_names[shader->infile.reg[idx].semantic.Name], + shader->infile.reg[idx].semantic.Index, + shader->infile.reg[idx].num_components); + } + printf("outputs:\n"); + for (int idx = 0; idx < shader->outfile.num_reg; ++idx) { + printf(" [%i] name=%s index=%i comps=%i\n", shader->outfile.reg[idx].reg, + tgsi_semantic_names[shader->outfile.reg[idx].semantic.Name], + shader->outfile.reg[idx].semantic.Index, + shader->outfile.reg[idx].num_components); + } + printf("special:\n"); + if (shader->processor == PIPE_SHADER_VERTEX) { + printf(" vs_pos_out_reg=%i\n", shader->vs_pos_out_reg); + printf(" vs_pointsize_out_reg=%i\n", shader->vs_pointsize_out_reg); + printf(" vs_load_balancing=0x%08x\n", shader->vs_load_balancing); + } else { + printf(" ps_color_out_reg=%i\n", shader->ps_color_out_reg); + printf(" ps_depth_out_reg=%i\n", shader->ps_depth_out_reg); + } + printf(" input_count_unk8=0x%08x\n", shader->input_count_unk8); +} + +void +etna_destroy_shader(struct etna_shader *shader) +{ + assert(shader); + + FREE(shader->code); + FREE(shader->uniforms.imm_data); + FREE(shader->uniforms.imm_contents); + FREE(shader->output_per_semantic_list); + FREE(shader); +} + +static const struct etna_shader_inout * +etna_shader_vs_lookup(const struct etna_shader *sobj, + const struct etna_shader_inout *in) +{ + if (in->semantic.Index < sobj->output_count_per_semantic[in->semantic.Name]) + return sobj->output_per_semantic[in->semantic.Name][in->semantic.Index]; + + return NULL; +} + +bool +etna_link_shader(struct etna_shader_link_info *info, + const struct etna_shader *vs, const struct etna_shader *fs) +{ + /* For each fragment input we need to find the associated vertex shader + * output, which can be found by matching on semantic name and index. A + * binary search could be used because the vs outputs are sorted by their + * semantic index and grouped by semantic type by fill_in_vs_outputs. + */ + assert(fs->infile.num_reg < ETNA_NUM_INPUTS); + + for (int idx = 0; idx < fs->infile.num_reg; ++idx) { + const struct etna_shader_inout *fsio = &fs->infile.reg[idx]; + const struct etna_shader_inout *vsio = etna_shader_vs_lookup(vs, fsio); + struct etna_varying *varying; + + assert(fsio->reg > 0 && fsio->reg <= ARRAY_SIZE(info->varyings)); + + if (fsio->reg > info->num_varyings) + info->num_varyings = fsio->reg; + + varying = &info->varyings[fsio->reg - 1]; + varying->num_components = fsio->num_components; + + if (fsio->semantic.Name == TGSI_SEMANTIC_COLOR) /* colors affected by flat shading */ + varying->pa_attributes = 0x200; + else /* texture coord or other bypasses flat shading */ + varying->pa_attributes = 0x2f1; + + if (fsio->semantic.Name == TGSI_SEMANTIC_PCOORD) { + varying->use[0] = VARYING_COMPONENT_USE_POINTCOORD_X; + varying->use[1] = VARYING_COMPONENT_USE_POINTCOORD_Y; + varying->use[2] = VARYING_COMPONENT_USE_USED; + varying->use[3] = VARYING_COMPONENT_USE_USED; + varying->reg = 0; /* replaced by point coord -- doesn't matter */ + continue; + } + + if (vsio == NULL) + return true; /* not found -- link error */ + + varying->use[0] = VARYING_COMPONENT_USE_USED; + varying->use[1] = VARYING_COMPONENT_USE_USED; + varying->use[2] = VARYING_COMPONENT_USE_USED; + varying->use[3] = VARYING_COMPONENT_USE_USED; + varying->reg = vsio->reg; + } + + assert(info->num_varyings == fs->infile.num_reg); + + return false; +} |