/** * For a given starting writemask channel and corresponding source index in * the vec instruction, insert a MOV to the vec instruction's dest of all the * writemask channels that get read from the same src reg. * * Returns the writemask of our MOV, so the parent loop calling this knows * which ones have been processed. */ static unsigned insert_mov(nir_alu_instr *vec, unsigned start_channel, unsigned start_src_idx, nir_shader *shader) { unsigned src_idx = start_src_idx; assert(src_idx < nir_op_infos[vec->op].num_inputs); nir_alu_instr *mov = nir_alu_instr_create(shader, nir_op_imov); nir_alu_src_copy(&mov->src[0], &vec->src[src_idx], mov); nir_alu_dest_copy(&mov->dest, &vec->dest, mov); mov->dest.write_mask = (1u << start_channel); mov->src[0].swizzle[start_channel] = vec->src[src_idx].swizzle[0]; src_idx++; for (unsigned i = start_channel + 1; i < 4; i++) { if (!(vec->dest.write_mask & (1 << i))) continue; if (nir_srcs_equal(vec->src[src_idx].src, vec->src[start_src_idx].src)) { mov->dest.write_mask |= (1 << i); mov->src[0].swizzle[i] = vec->src[src_idx].swizzle[0]; } src_idx++; } nir_instr_insert_before(&vec->instr, &mov->instr); return mov->dest.write_mask; }
static bool opt_undef_alu(nir_alu_instr *instr) { if (instr->op != nir_op_bcsel && instr->op != nir_op_fcsel) return false; assert(instr->dest.dest.is_ssa); for (int i = 1; i <= 2; i++) { if (!instr->src[i].src.is_ssa) continue; nir_instr *parent = instr->src[i].src.ssa->parent_instr; if (parent->type != nir_instr_type_ssa_undef) continue; /* We can't just use nir_alu_src_copy, because we need the def/use * updated. */ nir_instr_rewrite_src(&instr->instr, &instr->src[0].src, instr->src[i == 1 ? 2 : 1].src); nir_alu_src_copy(&instr->src[0], &instr->src[i == 1 ? 2 : 1], ralloc_parent(instr)); nir_src empty_src; memset(&empty_src, 0, sizeof(empty_src)); nir_instr_rewrite_src(&instr->instr, &instr->src[1].src, empty_src); nir_instr_rewrite_src(&instr->instr, &instr->src[2].src, empty_src); instr->op = nir_op_imov; return true; } return false; }
static void lower_reduction(nir_alu_instr *instr, nir_op chan_op, nir_op merge_op, void *mem_ctx) { unsigned num_components = nir_op_infos[instr->op].input_sizes[0]; nir_ssa_def *last = NULL; for (unsigned i = 0; i < num_components; i++) { nir_alu_instr *chan = nir_alu_instr_create(mem_ctx, chan_op); nir_alu_ssa_dest_init(chan, 1); nir_alu_src_copy(&chan->src[0], &instr->src[0], mem_ctx); chan->src[0].swizzle[0] = chan->src[0].swizzle[i]; if (nir_op_infos[chan_op].num_inputs > 1) { assert(nir_op_infos[chan_op].num_inputs == 2); nir_alu_src_copy(&chan->src[1], &instr->src[1], mem_ctx); chan->src[1].swizzle[0] = chan->src[1].swizzle[i]; } nir_instr_insert_before(&instr->instr, &chan->instr); if (i == 0) { last = &chan->dest.dest.ssa; } else { nir_alu_instr *merge = nir_alu_instr_create(mem_ctx, merge_op); nir_alu_ssa_dest_init(merge, 1); merge->dest.write_mask = 1; merge->src[0].src = nir_src_for_ssa(last); merge->src[1].src = nir_src_for_ssa(&chan->dest.dest.ssa); nir_instr_insert_before(&instr->instr, &merge->instr); last = &merge->dest.dest.ssa; } } assert(instr->dest.write_mask == 1); nir_ssa_def_rewrite_uses(&instr->dest.dest.ssa, nir_src_for_ssa(last), mem_ctx); nir_instr_remove(&instr->instr); }
static void lower_alu_instr_scalar(nir_alu_instr *instr, void *mem_ctx) { unsigned num_src = nir_op_infos[instr->op].num_inputs; unsigned i, chan; assert(instr->dest.dest.is_ssa); assert(instr->dest.write_mask != 0); #define LOWER_REDUCTION(name, chan, merge) \ case name##2: \ case name##3: \ case name##4: \ lower_reduction(instr, chan, merge, mem_ctx); \ break; switch (instr->op) { case nir_op_vec4: case nir_op_vec3: case nir_op_vec2: /* We don't need to scalarize these ops, they're the ones generated to * group up outputs into a value that can be SSAed. */ return; LOWER_REDUCTION(nir_op_fdot, nir_op_fmul, nir_op_fadd); LOWER_REDUCTION(nir_op_ball_fequal, nir_op_feq, nir_op_iand); LOWER_REDUCTION(nir_op_ball_iequal, nir_op_ieq, nir_op_iand); LOWER_REDUCTION(nir_op_bany_fnequal, nir_op_fne, nir_op_ior); LOWER_REDUCTION(nir_op_bany_inequal, nir_op_ine, nir_op_ior); LOWER_REDUCTION(nir_op_fall_equal, nir_op_seq, nir_op_fand); LOWER_REDUCTION(nir_op_fany_nequal, nir_op_sne, nir_op_for); LOWER_REDUCTION(nir_op_ball, nir_op_imov, nir_op_iand); LOWER_REDUCTION(nir_op_bany, nir_op_imov, nir_op_ior); LOWER_REDUCTION(nir_op_fall, nir_op_fmov, nir_op_fand); LOWER_REDUCTION(nir_op_fany, nir_op_fmov, nir_op_for); default: break; } if (instr->dest.dest.ssa.num_components == 1) return; unsigned num_components = instr->dest.dest.ssa.num_components; static const nir_op nir_op_map[] = {nir_op_vec2, nir_op_vec3, nir_op_vec4}; nir_alu_instr *vec_instr = nir_alu_instr_create(mem_ctx, nir_op_map[num_components - 2]); nir_alu_ssa_dest_init(vec_instr, num_components); for (chan = 0; chan < 4; chan++) { if (!(instr->dest.write_mask & (1 << chan))) continue; nir_alu_instr *lower = nir_alu_instr_create(mem_ctx, instr->op); for (i = 0; i < num_src; i++) { /* We only handle same-size-as-dest (input_sizes[] == 0) or scalar * args (input_sizes[] == 1). */ assert(nir_op_infos[instr->op].input_sizes[i] < 2); unsigned src_chan = (nir_op_infos[instr->op].input_sizes[i] == 1 ? 0 : chan); nir_alu_src_copy(&lower->src[i], &instr->src[i], mem_ctx); for (int j = 0; j < 4; j++) lower->src[i].swizzle[j] = instr->src[i].swizzle[src_chan]; } nir_alu_ssa_dest_init(lower, 1); lower->dest.saturate = instr->dest.saturate; vec_instr->src[chan].src = nir_src_for_ssa(&lower->dest.dest.ssa); nir_instr_insert_before(&instr->instr, &lower->instr); } nir_instr_insert_before(&instr->instr, &vec_instr->instr); nir_ssa_def_rewrite_uses(&instr->dest.dest.ssa, nir_src_for_ssa(&vec_instr->dest.dest.ssa), mem_ctx); nir_instr_remove(&instr->instr); }
static nir_alu_src construct_value(const nir_search_value *value, nir_alu_type type, unsigned num_components, struct match_state *state, nir_instr *instr, void *mem_ctx) { switch (value->type) { case nir_search_value_expression: { const nir_search_expression *expr = nir_search_value_as_expression(value); if (nir_op_infos[expr->opcode].output_size != 0) num_components = nir_op_infos[expr->opcode].output_size; nir_alu_instr *alu = nir_alu_instr_create(mem_ctx, expr->opcode); nir_ssa_dest_init(&alu->instr, &alu->dest.dest, num_components, NULL); alu->dest.write_mask = (1 << num_components) - 1; alu->dest.saturate = false; for (unsigned i = 0; i < nir_op_infos[expr->opcode].num_inputs; i++) { /* If the source is an explicitly sized source, then we need to reset * the number of components to match. */ if (nir_op_infos[alu->op].input_sizes[i] != 0) num_components = nir_op_infos[alu->op].input_sizes[i]; alu->src[i] = construct_value(expr->srcs[i], nir_op_infos[alu->op].input_types[i], num_components, state, instr, mem_ctx); } nir_instr_insert_before(instr, &alu->instr); nir_alu_src val; val.src = nir_src_for_ssa(&alu->dest.dest.ssa); val.negate = false; val.abs = false, memcpy(val.swizzle, identity_swizzle, sizeof val.swizzle); return val; } case nir_search_value_variable: { const nir_search_variable *var = nir_search_value_as_variable(value); assert(state->variables_seen & (1 << var->variable)); nir_alu_src val = { NIR_SRC_INIT }; nir_alu_src_copy(&val, &state->variables[var->variable], mem_ctx); assert(!var->is_constant); return val; } case nir_search_value_constant: { const nir_search_constant *c = nir_search_value_as_constant(value); nir_load_const_instr *load = nir_load_const_instr_create(mem_ctx, 1); switch (type) { case nir_type_float: load->def.name = ralloc_asprintf(mem_ctx, "%f", c->data.f); load->value.f[0] = c->data.f; break; case nir_type_int: load->def.name = ralloc_asprintf(mem_ctx, "%d", c->data.i); load->value.i[0] = c->data.i; break; case nir_type_unsigned: case nir_type_bool: load->value.u[0] = c->data.u; break; default: unreachable("Invalid alu source type"); } nir_instr_insert_before(instr, &load->instr); nir_alu_src val; val.src = nir_src_for_ssa(&load->def); val.negate = false; val.abs = false, memset(val.swizzle, 0, sizeof val.swizzle); return val; } default: unreachable("Invalid search value type"); } }