2010-04-05 23:24:28 +01:00
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/*
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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 ir_constant_folding.cpp
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* Replace constant-valued expressions with references to constant values.
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*/
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#include "ir.h"
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#include "ir_visitor.h"
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2010-05-05 19:45:30 +01:00
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#include "ir_optimization.h"
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2010-04-05 23:24:28 +01:00
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#include "glsl_types.h"
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/**
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* Visitor class for replacing expressions with ir_constant values.
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*/
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2010-05-05 19:45:30 +01:00
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class ir_constant_folding_visitor : public ir_visitor {
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public:
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ir_constant_folding_visitor()
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{
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/* empty */
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}
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virtual ~ir_constant_folding_visitor()
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{
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/* empty */
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}
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/**
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* \name Visit methods
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*
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* As typical for the visitor pattern, there must be one \c visit method for
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* each concrete subclass of \c ir_instruction. Virtual base classes within
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* the hierarchy should not have \c visit methods.
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*/
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/*@{*/
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virtual void visit(ir_variable *);
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virtual void visit(ir_function_signature *);
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virtual void visit(ir_function *);
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virtual void visit(ir_expression *);
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2010-05-27 01:42:03 +01:00
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virtual void visit(ir_texture *);
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virtual void visit(ir_swizzle *);
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2010-05-19 12:20:12 +01:00
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virtual void visit(ir_dereference_variable *);
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virtual void visit(ir_dereference_array *);
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virtual void visit(ir_dereference_record *);
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2010-05-05 19:45:30 +01:00
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virtual void visit(ir_assignment *);
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virtual void visit(ir_constant *);
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virtual void visit(ir_call *);
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virtual void visit(ir_return *);
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2010-06-30 18:47:34 +01:00
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virtual void visit(ir_discard *);
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virtual void visit(ir_if *);
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virtual void visit(ir_loop *);
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virtual void visit(ir_loop_jump *);
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/*@}*/
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};
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2010-04-05 23:24:28 +01:00
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void
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ir_constant_folding_visitor::visit(ir_variable *ir)
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{
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(void) ir;
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}
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void
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ir_constant_folding_visitor::visit(ir_function_signature *ir)
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{
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visit_exec_list(&ir->body, this);
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2010-04-05 23:24:28 +01:00
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}
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void
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ir_constant_folding_visitor::visit(ir_function *ir)
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{
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2010-05-12 20:15:40 +01:00
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foreach_iter(exec_list_iterator, iter, *ir) {
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ir_function_signature *const sig = (ir_function_signature *) iter.get();
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sig->accept(this);
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}
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2010-04-05 23:24:28 +01:00
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}
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void
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ir_constant_folding_visitor::visit(ir_expression *ir)
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{
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ir_constant *op[2];
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unsigned int operand;
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for (operand = 0; operand < ir->get_num_operands(); operand++) {
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op[operand] = ir->operands[operand]->constant_expression_value();
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if (op[operand]) {
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ir->operands[operand] = op[operand];
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2010-04-06 19:42:01 +01:00
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} else {
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ir->operands[operand]->accept(this);
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2010-04-05 23:24:28 +01:00
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}
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}
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}
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2010-05-27 01:42:03 +01:00
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void
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ir_constant_folding_visitor::visit(ir_texture *ir)
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{
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// FINISHME: Do stuff with texture lookups
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(void) ir;
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}
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2010-04-05 23:24:28 +01:00
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void
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ir_constant_folding_visitor::visit(ir_swizzle *ir)
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{
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2010-04-06 19:42:01 +01:00
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ir->val->accept(this);
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2010-04-05 23:24:28 +01:00
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}
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void
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2010-05-19 12:20:12 +01:00
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ir_constant_folding_visitor::visit(ir_dereference_variable *ir)
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{
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(void) ir;
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}
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void
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ir_constant_folding_visitor::visit(ir_dereference_array *ir)
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{
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ir_constant *const_val =
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ir->array_index->constant_expression_value();
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if (const_val)
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ir->array_index = const_val;
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else
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ir->array_index->accept(this);
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2010-05-19 12:20:12 +01:00
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2010-05-19 12:52:29 +01:00
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ir->array->accept(this);
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2010-05-19 12:20:12 +01:00
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}
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void
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ir_constant_folding_visitor::visit(ir_dereference_record *ir)
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2010-04-05 23:24:28 +01:00
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{
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2010-05-19 12:52:29 +01:00
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ir->record->accept(this);
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2010-04-05 23:24:28 +01:00
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}
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void
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ir_constant_folding_visitor::visit(ir_assignment *ir)
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{
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ir_constant *const_val = ir->rhs->constant_expression_value();
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if (const_val)
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ir->rhs = const_val;
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else
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ir->rhs->accept(this);
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}
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void
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ir_constant_folding_visitor::visit(ir_constant *ir)
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{
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(void) ir;
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}
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void
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ir_constant_folding_visitor::visit(ir_call *ir)
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{
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(void) ir;
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}
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void
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ir_constant_folding_visitor::visit(ir_return *ir)
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{
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(void) ir;
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}
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2010-06-30 18:47:34 +01:00
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void
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ir_constant_folding_visitor::visit(ir_discard *ir)
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{
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(void) ir;
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}
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2010-04-05 23:24:28 +01:00
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void
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ir_constant_folding_visitor::visit(ir_if *ir)
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{
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2010-04-06 18:07:20 +01:00
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ir_constant *const_val = ir->condition->constant_expression_value();
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if (const_val)
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ir->condition = const_val;
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else
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ir->condition->accept(this);
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2010-04-06 19:52:09 +01:00
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visit_exec_list(&ir->then_instructions, this);
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visit_exec_list(&ir->else_instructions, this);
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2010-04-05 23:24:28 +01:00
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}
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2010-04-06 00:16:07 +01:00
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void
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ir_constant_folding_visitor::visit(ir_loop *ir)
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{
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(void) ir;
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}
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2010-04-06 00:28:15 +01:00
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void
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ir_constant_folding_visitor::visit(ir_loop_jump *ir)
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{
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(void) ir;
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}
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2010-05-05 19:45:30 +01:00
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bool
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do_constant_folding(exec_list *instructions)
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{
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ir_constant_folding_visitor constant_folding;
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visit_exec_list(instructions, &constant_folding);
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/* FINISHME: Return real progress. */
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return false;
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}
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