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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#define NULL 0
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#include "ir.h"
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#include "ir_visitor.h"
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#include "ir_constant_folding.h"
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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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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_label *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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(void) ir;
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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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(void) ir;
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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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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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ir_constant_folding_visitor::visit(ir_dereference *ir)
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{
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2010-04-06 19:11:05 +01:00
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if (ir->mode == ir_dereference::ir_reference_array) {
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ir_constant *const_val = ir->selector.array_index->constant_expression_value();
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if (const_val)
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ir->selector.array_index = const_val;
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else
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ir->selector.array_index->accept(this);
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}
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ir->var->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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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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