mirror of https://gitlab.freedesktop.org/mesa/mesa
367 lines
9.8 KiB
C++
367 lines
9.8 KiB
C++
/*
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* Copyright © 2010 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
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* DEALINGS IN THE SOFTWARE.
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*/
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/**
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* \file opt_structure_splitting.cpp
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*
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* If a structure is only ever referenced by its components, then
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* split those components out to individual variables so they can be
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* handled normally by other optimization passes.
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*
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* This skips structures like uniforms, which need to be accessible as
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* structures for their access by the GL.
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*/
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#include "ir.h"
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#include "ir_visitor.h"
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#include "ir_rvalue_visitor.h"
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#include "glsl_types.h"
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namespace {
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static bool debug = false;
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class variable_entry : public exec_node
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{
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public:
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variable_entry(ir_variable *var)
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{
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this->var = var;
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this->whole_structure_access = 0;
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this->declaration = false;
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this->components = NULL;
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this->mem_ctx = NULL;
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}
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ir_variable *var; /* The key: the variable's pointer. */
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/** Number of times the variable is referenced, including assignments. */
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unsigned whole_structure_access;
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/* If the variable had a decl we can work with in the instruction
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* stream. We can't do splitting on function arguments, which
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* don't get this variable set.
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*/
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bool declaration;
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ir_variable **components;
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/** ralloc_parent(this->var) -- the shader's ralloc context. */
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void *mem_ctx;
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};
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class ir_structure_reference_visitor : public ir_hierarchical_visitor {
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public:
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ir_structure_reference_visitor(void)
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{
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this->mem_ctx = ralloc_context(NULL);
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this->variable_list.make_empty();
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}
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~ir_structure_reference_visitor(void)
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{
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ralloc_free(mem_ctx);
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}
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virtual ir_visitor_status visit(ir_variable *);
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virtual ir_visitor_status visit(ir_dereference_variable *);
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virtual ir_visitor_status visit_enter(ir_dereference_record *);
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virtual ir_visitor_status visit_enter(ir_assignment *);
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virtual ir_visitor_status visit_enter(ir_function_signature *);
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variable_entry *get_variable_entry(ir_variable *var);
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/* List of variable_entry */
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exec_list variable_list;
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void *mem_ctx;
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};
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variable_entry *
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ir_structure_reference_visitor::get_variable_entry(ir_variable *var)
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{
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assert(var);
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if (!var->type->is_record() || var->data.mode == ir_var_uniform
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|| var->data.mode == ir_var_shader_in || var->data.mode == ir_var_shader_out)
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return NULL;
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foreach_in_list(variable_entry, entry, &this->variable_list) {
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if (entry->var == var)
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return entry;
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}
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variable_entry *entry = new(mem_ctx) variable_entry(var);
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this->variable_list.push_tail(entry);
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return entry;
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}
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ir_visitor_status
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ir_structure_reference_visitor::visit(ir_variable *ir)
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{
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variable_entry *entry = this->get_variable_entry(ir);
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if (entry)
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entry->declaration = true;
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return visit_continue;
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}
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ir_visitor_status
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ir_structure_reference_visitor::visit(ir_dereference_variable *ir)
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{
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ir_variable *const var = ir->variable_referenced();
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variable_entry *entry = this->get_variable_entry(var);
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if (entry)
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entry->whole_structure_access++;
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return visit_continue;
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}
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ir_visitor_status
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ir_structure_reference_visitor::visit_enter(ir_dereference_record *ir)
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{
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(void) ir;
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/* Don't descend into the ir_dereference_variable below. */
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return visit_continue_with_parent;
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}
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ir_visitor_status
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ir_structure_reference_visitor::visit_enter(ir_assignment *ir)
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{
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/* If there are no structure references yet, no need to bother with
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* processing the expression tree.
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*/
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if (this->variable_list.is_empty())
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return visit_continue_with_parent;
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if (ir->lhs->as_dereference_variable() &&
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ir->rhs->as_dereference_variable() &&
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!ir->condition) {
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/* We'll split copies of a structure to copies of components, so don't
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* descend to the ir_dereference_variables.
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*/
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return visit_continue_with_parent;
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}
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return visit_continue;
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}
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ir_visitor_status
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ir_structure_reference_visitor::visit_enter(ir_function_signature *ir)
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{
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/* We don't have logic for structure-splitting function arguments,
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* so just look at the body instructions and not the parameter
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* declarations.
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*/
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visit_list_elements(this, &ir->body);
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return visit_continue_with_parent;
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}
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class ir_structure_splitting_visitor : public ir_rvalue_visitor {
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public:
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ir_structure_splitting_visitor(exec_list *vars)
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{
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this->variable_list = vars;
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}
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virtual ~ir_structure_splitting_visitor()
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{
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}
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virtual ir_visitor_status visit_leave(ir_assignment *);
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void split_deref(ir_dereference **deref);
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void handle_rvalue(ir_rvalue **rvalue);
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variable_entry *get_splitting_entry(ir_variable *var);
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exec_list *variable_list;
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};
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variable_entry *
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ir_structure_splitting_visitor::get_splitting_entry(ir_variable *var)
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{
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assert(var);
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if (!var->type->is_record())
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return NULL;
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foreach_in_list(variable_entry, entry, this->variable_list) {
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if (entry->var == var) {
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return entry;
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}
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}
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return NULL;
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}
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void
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ir_structure_splitting_visitor::split_deref(ir_dereference **deref)
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{
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if ((*deref)->ir_type != ir_type_dereference_record)
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return;
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ir_dereference_record *deref_record = (ir_dereference_record *)*deref;
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ir_dereference_variable *deref_var = deref_record->record->as_dereference_variable();
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if (!deref_var)
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return;
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variable_entry *entry = get_splitting_entry(deref_var->var);
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if (!entry)
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return;
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unsigned int i;
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for (i = 0; i < entry->var->type->length; i++) {
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if (strcmp(deref_record->field,
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entry->var->type->fields.structure[i].name) == 0)
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break;
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}
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assert(i != entry->var->type->length);
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*deref = new(entry->mem_ctx) ir_dereference_variable(entry->components[i]);
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}
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void
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ir_structure_splitting_visitor::handle_rvalue(ir_rvalue **rvalue)
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{
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if (!*rvalue)
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return;
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ir_dereference *deref = (*rvalue)->as_dereference();
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if (!deref)
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return;
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split_deref(&deref);
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*rvalue = deref;
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}
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ir_visitor_status
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ir_structure_splitting_visitor::visit_leave(ir_assignment *ir)
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{
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ir_dereference_variable *lhs_deref = ir->lhs->as_dereference_variable();
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ir_dereference_variable *rhs_deref = ir->rhs->as_dereference_variable();
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variable_entry *lhs_entry = lhs_deref ? get_splitting_entry(lhs_deref->var) : NULL;
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variable_entry *rhs_entry = rhs_deref ? get_splitting_entry(rhs_deref->var) : NULL;
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const glsl_type *type = ir->rhs->type;
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if ((lhs_entry || rhs_entry) && !ir->condition) {
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for (unsigned int i = 0; i < type->length; i++) {
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ir_dereference *new_lhs, *new_rhs;
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void *mem_ctx = lhs_entry ? lhs_entry->mem_ctx : rhs_entry->mem_ctx;
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if (lhs_entry) {
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new_lhs = new(mem_ctx) ir_dereference_variable(lhs_entry->components[i]);
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} else {
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new_lhs = new(mem_ctx)
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ir_dereference_record(ir->lhs->clone(mem_ctx, NULL),
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type->fields.structure[i].name);
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}
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if (rhs_entry) {
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new_rhs = new(mem_ctx) ir_dereference_variable(rhs_entry->components[i]);
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} else {
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new_rhs = new(mem_ctx)
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ir_dereference_record(ir->rhs->clone(mem_ctx, NULL),
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type->fields.structure[i].name);
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}
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ir->insert_before(new(mem_ctx) ir_assignment(new_lhs,
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new_rhs,
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NULL));
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}
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ir->remove();
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} else {
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handle_rvalue(&ir->rhs);
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split_deref(&ir->lhs);
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}
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handle_rvalue(&ir->condition);
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return visit_continue;
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}
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} /* unnamed namespace */
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bool
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do_structure_splitting(exec_list *instructions)
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{
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ir_structure_reference_visitor refs;
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visit_list_elements(&refs, instructions);
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/* Trim out variables we can't split. */
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foreach_in_list_safe(variable_entry, entry, &refs.variable_list) {
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if (debug) {
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printf("structure %s@%p: decl %d, whole_access %d\n",
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entry->var->name, (void *) entry->var, entry->declaration,
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entry->whole_structure_access);
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}
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if (!entry->declaration || entry->whole_structure_access) {
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entry->remove();
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}
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}
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if (refs.variable_list.is_empty())
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return false;
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void *mem_ctx = ralloc_context(NULL);
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/* Replace the decls of the structures to be split with their split
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* components.
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*/
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foreach_in_list_safe(variable_entry, entry, &refs.variable_list) {
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const struct glsl_type *type = entry->var->type;
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entry->mem_ctx = ralloc_parent(entry->var);
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entry->components = ralloc_array(mem_ctx,
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ir_variable *,
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type->length);
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for (unsigned int i = 0; i < entry->var->type->length; i++) {
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const char *name = ralloc_asprintf(mem_ctx, "%s_%s",
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entry->var->name,
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type->fields.structure[i].name);
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entry->components[i] =
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new(entry->mem_ctx) ir_variable(type->fields.structure[i].type,
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name,
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ir_var_temporary);
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entry->var->insert_before(entry->components[i]);
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}
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entry->var->remove();
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}
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ir_structure_splitting_visitor split(&refs.variable_list);
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visit_list_elements(&split, instructions);
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ralloc_free(mem_ctx);
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return true;
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}
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