2019-03-06 21:21:51 +00:00
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/*
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* Copyright © 2019 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include "nir.h"
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#include "nir_builder.h"
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#include "nir_deref.h"
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/** @file nir_lower_io_to_vector.c
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*
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* Merges compatible input/output variables residing in different components
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* of the same location. It's expected that further passes such as
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* nir_lower_io_to_temporaries will combine loads and stores of the merged
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* variables, producing vector nir_load_input/nir_store_output instructions
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* when all is said and done.
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*/
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static const struct glsl_type *
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resize_array_vec_type(const struct glsl_type *type, unsigned num_components)
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{
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if (glsl_type_is_array(type)) {
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const struct glsl_type *arr_elem =
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resize_array_vec_type(glsl_get_array_element(type), num_components);
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return glsl_array_type(arr_elem, glsl_get_length(type), 0);
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} else {
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assert(glsl_type_is_vector_or_scalar(type));
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return glsl_vector_type(glsl_get_base_type(type), num_components);
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}
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}
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static bool
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variable_can_rewrite(const nir_variable *var)
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{
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/* Only touch user defined varyings as these are the only ones we split */
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if (var->data.location < VARYING_SLOT_VAR0)
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return false;
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/* Skip complex types we don't split in the first place */
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if (!glsl_type_is_vector_or_scalar(glsl_without_array(var->type)))
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return false;
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/* TODO: add 64/16bit support ? */
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if (glsl_get_bit_size(glsl_without_array(var->type)) != 32)
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return false;
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return true;
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}
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static bool
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variables_can_merge(nir_shader *shader,
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const nir_variable *a, const nir_variable *b)
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{
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const struct glsl_type *a_type_tail = a->type;
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const struct glsl_type *b_type_tail = b->type;
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/* They must have the same array structure */
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while (glsl_type_is_array(a_type_tail)) {
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if (!glsl_type_is_array(b_type_tail))
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return false;
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if (glsl_get_length(a_type_tail) != glsl_get_length(b_type_tail))
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return false;
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a_type_tail = glsl_get_array_element(a_type_tail);
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b_type_tail = glsl_get_array_element(b_type_tail);
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}
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if (!glsl_type_is_vector_or_scalar(a_type_tail) ||
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!glsl_type_is_vector_or_scalar(b_type_tail))
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return false;
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if (glsl_get_base_type(a->type) != glsl_get_base_type(b->type))
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return false;
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assert(a->data.mode == b->data.mode);
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if (shader->info.stage == MESA_SHADER_FRAGMENT &&
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a->data.mode == nir_var_shader_in &&
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a->data.interpolation != b->data.interpolation)
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return false;
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return true;
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}
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static bool
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create_new_io_vars(nir_shader *shader, struct exec_list *io_list,
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nir_variable *old_vars[MAX_VARYINGS_INCL_PATCH][4],
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nir_variable *new_vars[MAX_VARYINGS_INCL_PATCH][4])
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{
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if (exec_list_is_empty(io_list))
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return false;
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nir_foreach_variable(var, io_list) {
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if (variable_can_rewrite(var)) {
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unsigned loc = var->data.location - VARYING_SLOT_VAR0;
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unsigned frac = var->data.location_frac;
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old_vars[loc][frac] = var;
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}
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}
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bool merged_any_vars = false;
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/* We don't handle combining vars of different type e.g. different array
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* lengths.
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*/
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for (unsigned loc = 0; loc < MAX_VARYINGS_INCL_PATCH; loc++) {
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unsigned frac = 0;
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while (frac < 4) {
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nir_variable *first_var = old_vars[loc][frac];
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if (!first_var) {
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frac++;
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continue;
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}
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int first = frac;
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bool found_merge = false;
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while (frac < 4) {
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nir_variable *var = old_vars[loc][frac];
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if (!var)
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break;
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if (var != first_var) {
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if (!variables_can_merge(shader, first_var, var))
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break;
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found_merge = true;
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}
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const unsigned num_components =
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glsl_get_components(glsl_without_array(var->type));
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/* We had better not have any overlapping vars */
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for (unsigned i = 1; i < num_components; i++)
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assert(old_vars[loc][frac + i] == NULL);
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frac += num_components;
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}
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if (!found_merge)
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continue;
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merged_any_vars = true;
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nir_variable *var = nir_variable_clone(old_vars[loc][first], shader);
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var->data.location_frac = first;
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var->type = resize_array_vec_type(var->type, frac - first);
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nir_shader_add_variable(shader, var);
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for (unsigned i = first; i < frac; i++)
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new_vars[loc][i] = var;
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}
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}
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return merged_any_vars;
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}
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static nir_deref_instr *
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build_array_deref_of_new_var(nir_builder *b, nir_variable *new_var,
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nir_deref_instr *leader)
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{
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if (leader->deref_type == nir_deref_type_var)
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return nir_build_deref_var(b, new_var);
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nir_deref_instr *parent =
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build_array_deref_of_new_var(b, new_var, nir_deref_instr_parent(leader));
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return nir_build_deref_follower(b, parent, leader);
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}
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static bool
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nir_lower_io_to_vector_impl(nir_function_impl *impl, nir_variable_mode modes)
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{
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assert(!(modes & ~(nir_var_shader_in | nir_var_shader_out)));
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nir_builder b;
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nir_builder_init(&b, impl);
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nir_metadata_require(impl, nir_metadata_dominance);
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nir_shader *shader = impl->function->shader;
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2019-04-23 12:35:17 +01:00
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nir_variable *old_inputs[MAX_VARYINGS_INCL_PATCH][4] = {{0}};
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nir_variable *new_inputs[MAX_VARYINGS_INCL_PATCH][4] = {{0}};
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nir_variable *old_outputs[MAX_VARYINGS_INCL_PATCH][4] = {{0}};
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nir_variable *new_outputs[MAX_VARYINGS_INCL_PATCH][4] = {{0}};
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2019-03-06 21:21:51 +00:00
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if (modes & nir_var_shader_in) {
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/* Vertex shaders support overlapping inputs. We don't do those */
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assert(b.shader->info.stage != MESA_SHADER_VERTEX);
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/* If we don't actually merge any variables, remove that bit from modes
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* so we don't bother doing extra non-work.
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*/
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if (!create_new_io_vars(shader, &shader->inputs,
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old_inputs, new_inputs))
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modes &= ~nir_var_shader_in;
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}
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if (modes & nir_var_shader_out) {
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/* Fragment shader outputs are always vec4. You shouldn't have
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* scalarized them and it doesn't make sense to vectorize them.
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*/
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assert(b.shader->info.stage != MESA_SHADER_FRAGMENT);
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/* If we don't actually merge any variables, remove that bit from modes
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* so we don't bother doing extra non-work.
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*/
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if (!create_new_io_vars(shader, &shader->outputs,
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old_outputs, new_outputs))
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modes &= ~nir_var_shader_out;
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}
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if (!modes)
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return false;
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bool progress = false;
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/* Actually lower all the IO load/store intrinsics. Load instructions are
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* lowered to a vector load and an ALU instruction to grab the channels we
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* want. Outputs are lowered to a write-masked store of the vector output.
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* For non-TCS outputs, we then run nir_lower_io_to_temporaries at the end
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* to clean up the partial writes.
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*/
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nir_foreach_block(block, impl) {
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nir_foreach_instr_safe(instr, block) {
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if (instr->type != nir_instr_type_intrinsic)
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continue;
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nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
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switch (intrin->intrinsic) {
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case nir_intrinsic_load_deref:
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case nir_intrinsic_interp_deref_at_centroid:
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case nir_intrinsic_interp_deref_at_sample:
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case nir_intrinsic_interp_deref_at_offset: {
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nir_deref_instr *old_deref = nir_src_as_deref(intrin->src[0]);
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if (!(old_deref->mode & modes))
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break;
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if (old_deref->mode == nir_var_shader_out)
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assert(b.shader->info.stage == MESA_SHADER_TESS_CTRL);
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nir_variable *old_var = nir_deref_instr_get_variable(old_deref);
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if (old_var->data.location < VARYING_SLOT_VAR0)
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break;
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const unsigned loc = old_var->data.location - VARYING_SLOT_VAR0;
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const unsigned old_frac = old_var->data.location_frac;
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nir_variable *new_var = old_deref->mode == nir_var_shader_in ?
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new_inputs[loc][old_frac] :
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new_outputs[loc][old_frac];
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if (!new_var)
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break;
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assert(new_var->data.location == VARYING_SLOT_VAR0 + loc);
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const unsigned new_frac = new_var->data.location_frac;
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nir_component_mask_t vec4_comp_mask =
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((1 << intrin->num_components) - 1) << old_frac;
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b.cursor = nir_before_instr(&intrin->instr);
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/* Rewrite the load to use the new variable and only select a
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* portion of the result.
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*/
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nir_deref_instr *new_deref =
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build_array_deref_of_new_var(&b, new_var, old_deref);
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assert(glsl_type_is_vector(new_deref->type));
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nir_instr_rewrite_src(&intrin->instr, &intrin->src[0],
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nir_src_for_ssa(&new_deref->dest.ssa));
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intrin->num_components =
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glsl_get_components(new_deref->type);
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intrin->dest.ssa.num_components = intrin->num_components;
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b.cursor = nir_after_instr(&intrin->instr);
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nir_ssa_def *new_vec = nir_channels(&b, &intrin->dest.ssa,
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vec4_comp_mask >> new_frac);
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nir_ssa_def_rewrite_uses_after(&intrin->dest.ssa,
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nir_src_for_ssa(new_vec),
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new_vec->parent_instr);
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progress = true;
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break;
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}
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case nir_intrinsic_store_deref: {
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nir_deref_instr *old_deref = nir_src_as_deref(intrin->src[0]);
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if (old_deref->mode != nir_var_shader_out)
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break;
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nir_variable *old_var = nir_deref_instr_get_variable(old_deref);
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if (old_var->data.location < VARYING_SLOT_VAR0)
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break;
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const unsigned loc = old_var->data.location - VARYING_SLOT_VAR0;
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const unsigned old_frac = old_var->data.location_frac;
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nir_variable *new_var = new_outputs[loc][old_frac];
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if (!new_var)
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break;
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assert(new_var->data.location == VARYING_SLOT_VAR0 + loc);
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const unsigned new_frac = new_var->data.location_frac;
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b.cursor = nir_before_instr(&intrin->instr);
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/* Rewrite the store to be a masked store to the new variable */
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nir_deref_instr *new_deref =
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build_array_deref_of_new_var(&b, new_var, old_deref);
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assert(glsl_type_is_vector(new_deref->type));
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nir_instr_rewrite_src(&intrin->instr, &intrin->src[0],
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nir_src_for_ssa(&new_deref->dest.ssa));
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intrin->num_components =
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glsl_get_components(new_deref->type);
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nir_component_mask_t old_wrmask = nir_intrinsic_write_mask(intrin);
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assert(intrin->src[1].is_ssa);
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nir_ssa_def *old_value = intrin->src[1].ssa;
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nir_ssa_def *comps[4];
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for (unsigned c = 0; c < intrin->num_components; c++) {
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if (new_frac + c >= old_frac &&
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(old_wrmask & 1 << (new_frac + c - old_frac))) {
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comps[c] = nir_channel(&b, old_value,
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|
|
|
new_frac + c - old_frac);
|
|
|
|
} else {
|
|
|
|
comps[c] = nir_ssa_undef(&b, old_value->num_components,
|
|
|
|
old_value->bit_size);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
nir_ssa_def *new_value = nir_vec(&b, comps, intrin->num_components);
|
|
|
|
nir_instr_rewrite_src(&intrin->instr, &intrin->src[1],
|
|
|
|
nir_src_for_ssa(new_value));
|
|
|
|
|
|
|
|
nir_intrinsic_set_write_mask(intrin,
|
|
|
|
old_wrmask << (old_frac - new_frac));
|
|
|
|
|
|
|
|
progress = true;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
default:
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (progress) {
|
|
|
|
nir_metadata_preserve(impl, nir_metadata_block_index |
|
|
|
|
nir_metadata_dominance);
|
|
|
|
}
|
|
|
|
|
|
|
|
return progress;
|
|
|
|
}
|
|
|
|
|
|
|
|
bool
|
|
|
|
nir_lower_io_to_vector(nir_shader *shader, nir_variable_mode modes)
|
|
|
|
{
|
|
|
|
bool progress = false;
|
|
|
|
|
|
|
|
nir_foreach_function(function, shader) {
|
|
|
|
if (function->impl)
|
|
|
|
progress |= nir_lower_io_to_vector_impl(function->impl, modes);
|
|
|
|
}
|
|
|
|
|
|
|
|
return progress;
|
|
|
|
}
|