/* * Copyright © 2016 Broadcom * * 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. */ #include "nir.h" #include "nir_builder.h" #include "nir_deref.h" /** @file nir_lower_io_to_scalar.c * * Replaces nir_load_input/nir_store_output operations with num_components != * 1 with individual per-channel operations. */ static void lower_load_input_to_scalar(nir_builder *b, nir_intrinsic_instr *intr) { b->cursor = nir_before_instr(&intr->instr); assert(intr->dest.is_ssa); nir_ssa_def *loads[NIR_MAX_VEC_COMPONENTS]; for (unsigned i = 0; i < intr->num_components; i++) { nir_intrinsic_instr *chan_intr = nir_intrinsic_instr_create(b->shader, intr->intrinsic); nir_ssa_dest_init(&chan_intr->instr, &chan_intr->dest, 1, intr->dest.ssa.bit_size, NULL); chan_intr->num_components = 1; nir_intrinsic_set_base(chan_intr, nir_intrinsic_base(intr)); nir_intrinsic_set_component(chan_intr, nir_intrinsic_component(intr) + i); /* offset */ nir_src_copy(&chan_intr->src[0], &intr->src[0], chan_intr); nir_builder_instr_insert(b, &chan_intr->instr); loads[i] = &chan_intr->dest.ssa; } nir_ssa_def_rewrite_uses(&intr->dest.ssa, nir_src_for_ssa(nir_vec(b, loads, intr->num_components))); nir_instr_remove(&intr->instr); } static void lower_store_output_to_scalar(nir_builder *b, nir_intrinsic_instr *intr) { b->cursor = nir_before_instr(&intr->instr); nir_ssa_def *value = nir_ssa_for_src(b, intr->src[0], intr->num_components); for (unsigned i = 0; i < intr->num_components; i++) { if (!(nir_intrinsic_write_mask(intr) & (1 << i))) continue; nir_intrinsic_instr *chan_intr = nir_intrinsic_instr_create(b->shader, intr->intrinsic); chan_intr->num_components = 1; nir_intrinsic_set_base(chan_intr, nir_intrinsic_base(intr)); nir_intrinsic_set_write_mask(chan_intr, 0x1); nir_intrinsic_set_component(chan_intr, nir_intrinsic_component(intr) + i); /* value */ chan_intr->src[0] = nir_src_for_ssa(nir_channel(b, value, i)); /* offset */ nir_src_copy(&chan_intr->src[1], &intr->src[1], chan_intr); nir_builder_instr_insert(b, &chan_intr->instr); } nir_instr_remove(&intr->instr); } void nir_lower_io_to_scalar(nir_shader *shader, nir_variable_mode mask) { nir_foreach_function(function, shader) { if (function->impl) { nir_builder b; nir_builder_init(&b, function->impl); nir_foreach_block(block, function->impl) { nir_foreach_instr_safe(instr, block) { if (instr->type != nir_instr_type_intrinsic) continue; nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr); if (intr->num_components == 1) continue; switch (intr->intrinsic) { case nir_intrinsic_load_input: if (mask & nir_var_shader_in) lower_load_input_to_scalar(&b, intr); break; case nir_intrinsic_store_output: if (mask & nir_var_shader_out) lower_store_output_to_scalar(&b, intr); break; default: break; } } } } } } static nir_variable ** get_channel_variables(struct hash_table *ht, nir_variable *var) { nir_variable **chan_vars; struct hash_entry *entry = _mesa_hash_table_search(ht, var); if (!entry) { chan_vars = (nir_variable **) calloc(4, sizeof(nir_variable *)); _mesa_hash_table_insert(ht, var, chan_vars); } else { chan_vars = (nir_variable **) entry->data; } return chan_vars; } /* * Note that the src deref that we are cloning is the head of the * chain of deref instructions from the original intrinsic, but * the dst we are cloning to is the tail (because chains of deref * instructions are created back to front) */ static nir_deref_instr * clone_deref_array(nir_builder *b, nir_deref_instr *dst_tail, const nir_deref_instr *src_head) { const nir_deref_instr *parent = nir_deref_instr_parent(src_head); if (!parent) return dst_tail; assert(src_head->deref_type == nir_deref_type_array); dst_tail = clone_deref_array(b, dst_tail, parent); return nir_build_deref_array(b, dst_tail, nir_ssa_for_src(b, src_head->arr.index, 1)); } static void lower_load_to_scalar_early(nir_builder *b, nir_intrinsic_instr *intr, nir_variable *var, struct hash_table *split_inputs, struct hash_table *split_outputs) { b->cursor = nir_before_instr(&intr->instr); assert(intr->dest.is_ssa); nir_ssa_def *loads[NIR_MAX_VEC_COMPONENTS]; nir_variable **chan_vars; if (var->data.mode == nir_var_shader_in) { chan_vars = get_channel_variables(split_inputs, var); } else { chan_vars = get_channel_variables(split_outputs, var); } for (unsigned i = 0; i < intr->num_components; i++) { nir_variable *chan_var = chan_vars[var->data.location_frac + i]; if (!chan_vars[var->data.location_frac + i]) { chan_var = nir_variable_clone(var, b->shader); chan_var->data.location_frac = var->data.location_frac + i; chan_var->type = glsl_channel_type(chan_var->type); chan_vars[var->data.location_frac + i] = chan_var; nir_shader_add_variable(b->shader, chan_var); } nir_intrinsic_instr *chan_intr = nir_intrinsic_instr_create(b->shader, intr->intrinsic); nir_ssa_dest_init(&chan_intr->instr, &chan_intr->dest, 1, intr->dest.ssa.bit_size, NULL); chan_intr->num_components = 1; nir_deref_instr *deref = nir_build_deref_var(b, chan_var); deref = clone_deref_array(b, deref, nir_src_as_deref(intr->src[0])); chan_intr->src[0] = nir_src_for_ssa(&deref->dest.ssa); if (intr->intrinsic == nir_intrinsic_interp_deref_at_offset || intr->intrinsic == nir_intrinsic_interp_deref_at_sample) nir_src_copy(&chan_intr->src[1], &intr->src[1], &chan_intr->instr); nir_builder_instr_insert(b, &chan_intr->instr); loads[i] = &chan_intr->dest.ssa; } nir_ssa_def_rewrite_uses(&intr->dest.ssa, nir_src_for_ssa(nir_vec(b, loads, intr->num_components))); /* Remove the old load intrinsic */ nir_instr_remove(&intr->instr); } static void lower_store_output_to_scalar_early(nir_builder *b, nir_intrinsic_instr *intr, nir_variable *var, struct hash_table *split_outputs) { b->cursor = nir_before_instr(&intr->instr); nir_ssa_def *value = nir_ssa_for_src(b, intr->src[1], intr->num_components); nir_variable **chan_vars = get_channel_variables(split_outputs, var); for (unsigned i = 0; i < intr->num_components; i++) { if (!(nir_intrinsic_write_mask(intr) & (1 << i))) continue; nir_variable *chan_var = chan_vars[var->data.location_frac + i]; if (!chan_vars[var->data.location_frac + i]) { chan_var = nir_variable_clone(var, b->shader); chan_var->data.location_frac = var->data.location_frac + i; chan_var->type = glsl_channel_type(chan_var->type); chan_vars[var->data.location_frac + i] = chan_var; nir_shader_add_variable(b->shader, chan_var); } nir_intrinsic_instr *chan_intr = nir_intrinsic_instr_create(b->shader, intr->intrinsic); chan_intr->num_components = 1; nir_intrinsic_set_write_mask(chan_intr, 0x1); nir_deref_instr *deref = nir_build_deref_var(b, chan_var); deref = clone_deref_array(b, deref, nir_src_as_deref(intr->src[0])); chan_intr->src[0] = nir_src_for_ssa(&deref->dest.ssa); chan_intr->src[1] = nir_src_for_ssa(nir_channel(b, value, i)); nir_builder_instr_insert(b, &chan_intr->instr); } /* Remove the old store intrinsic */ nir_instr_remove(&intr->instr); } /* * This function is intended to be called earlier than nir_lower_io_to_scalar() * i.e. before nir_lower_io() is called. */ void nir_lower_io_to_scalar_early(nir_shader *shader, nir_variable_mode mask) { struct hash_table *split_inputs = _mesa_pointer_hash_table_create(NULL); struct hash_table *split_outputs = _mesa_pointer_hash_table_create(NULL); nir_foreach_function(function, shader) { if (function->impl) { nir_builder b; nir_builder_init(&b, function->impl); nir_foreach_block(block, function->impl) { nir_foreach_instr_safe(instr, block) { if (instr->type != nir_instr_type_intrinsic) continue; nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr); if (intr->num_components == 1) continue; if (intr->intrinsic != nir_intrinsic_load_deref && intr->intrinsic != nir_intrinsic_store_deref && intr->intrinsic != nir_intrinsic_interp_deref_at_centroid && intr->intrinsic != nir_intrinsic_interp_deref_at_sample && intr->intrinsic != nir_intrinsic_interp_deref_at_offset) continue; nir_deref_instr *deref = nir_src_as_deref(intr->src[0]); nir_variable_mode mode = deref->mode; if (!(mode & mask)) continue; nir_variable *var = nir_deref_instr_get_variable(deref); /* TODO: add patch support */ if (var->data.patch) continue; /* TODO: add doubles support */ if (glsl_type_is_64bit(glsl_without_array(var->type))) continue; if (!(shader->info.stage == MESA_SHADER_VERTEX && mode == nir_var_shader_in) && var->data.location < VARYING_SLOT_VAR0 && var->data.location >= 0) continue; /* Don't bother splitting if we can't opt away any unused * components. */ if (var->data.always_active_io) continue; /* Skip types we cannot split */ if (glsl_type_is_matrix(glsl_without_array(var->type)) || glsl_type_is_struct(glsl_without_array(var->type))) continue; switch (intr->intrinsic) { case nir_intrinsic_interp_deref_at_centroid: case nir_intrinsic_interp_deref_at_sample: case nir_intrinsic_interp_deref_at_offset: case nir_intrinsic_load_deref: if ((mask & nir_var_shader_in && mode == nir_var_shader_in) || (mask & nir_var_shader_out && mode == nir_var_shader_out)) lower_load_to_scalar_early(&b, intr, var, split_inputs, split_outputs); break; case nir_intrinsic_store_deref: if (mask & nir_var_shader_out && mode == nir_var_shader_out) lower_store_output_to_scalar_early(&b, intr, var, split_outputs); break; default: break; } } } } } /* Remove old input from the shaders inputs list */ hash_table_foreach(split_inputs, entry) { nir_variable *var = (nir_variable *) entry->key; exec_node_remove(&var->node); free(entry->data); } /* Remove old output from the shaders outputs list */ hash_table_foreach(split_outputs, entry) { nir_variable *var = (nir_variable *) entry->key; exec_node_remove(&var->node); free(entry->data); } _mesa_hash_table_destroy(split_inputs, NULL); _mesa_hash_table_destroy(split_outputs, NULL); nir_remove_dead_derefs(shader); }