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/*
* Copyright © 2010 Intel Corporation
*
* 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.
*/
/**
* \file ir_constant_folding.cpp
* Replace constant-valued expressions with references to constant values.
*/
#define NULL 0
#include "ir.h"
#include "ir_visitor.h"
#include "ir_constant_folding.h"
#include "glsl_types.h"
/**
* Visitor class for replacing expressions with ir_constant values.
*/
void
ir_constant_folding_visitor::visit(ir_variable *ir)
{
(void) ir;
}
void
ir_constant_folding_visitor::visit(ir_function_signature *ir)
{
visit_exec_list(&ir->body, this);
}
void
ir_constant_folding_visitor::visit(ir_function *ir)
{
(void) ir;
}
void
ir_constant_folding_visitor::visit(ir_expression *ir)
{
ir_constant *op[2];
unsigned int operand;
for (operand = 0; operand < ir->get_num_operands(); operand++) {
op[operand] = ir->operands[operand]->constant_expression_value();
if (op[operand]) {
ir->operands[operand] = op[operand];
} else {
ir->operands[operand]->accept(this);
}
}
}
void
ir_constant_folding_visitor::visit(ir_swizzle *ir)
{
ir->val->accept(this);
}
void
ir_constant_folding_visitor::visit(ir_dereference *ir)
{
if (ir->mode == ir_dereference::ir_reference_array) {
ir_constant *const_val = ir->selector.array_index->constant_expression_value();
if (const_val)
ir->selector.array_index = const_val;
else
ir->selector.array_index->accept(this);
}
ir->var->accept(this);
}
void
ir_constant_folding_visitor::visit(ir_assignment *ir)
{
ir_constant *const_val = ir->rhs->constant_expression_value();
if (const_val)
ir->rhs = const_val;
else
ir->rhs->accept(this);
}
void
ir_constant_folding_visitor::visit(ir_constant *ir)
{
(void) ir;
}
void
ir_constant_folding_visitor::visit(ir_call *ir)
{
(void) ir;
}
void
ir_constant_folding_visitor::visit(ir_return *ir)
{
(void) ir;
}
void
ir_constant_folding_visitor::visit(ir_if *ir)
{
ir_constant *const_val = ir->condition->constant_expression_value();
if (const_val)
ir->condition = const_val;
else
ir->condition->accept(this);
visit_exec_list(&ir->then_instructions, this);
visit_exec_list(&ir->else_instructions, this);
}
void
ir_constant_folding_visitor::visit(ir_loop *ir)
{
(void) ir;
}
void
ir_constant_folding_visitor::visit(ir_loop_jump *ir)
{
(void) ir;
}
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