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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_expression_flattening.cpp
*
* Takes the leaves of expression trees and makes them dereferences of
* assignments of the leaves to temporaries, according to a predicate.
*
* This is used for automatic function inlining, where we want to take
* an expression containing a call and move the call out to its own
* assignment so that we can inline it at the appropriate place in the
* instruction stream.
*/
#include "ir.h"
#include "ir_visitor.h"
#include "ir_expression_flattening.h"
#include "glsl_types.h"
class ir_expression_flattening_visitor : public ir_hierarchical_visitor {
public:
ir_expression_flattening_visitor(ir_instruction *base_ir,
bool (*predicate)(ir_instruction *ir))
{
this->base_ir = base_ir;
this->predicate = predicate;
}
virtual ~ir_expression_flattening_visitor()
{
/* empty */
}
virtual ir_visitor_status visit_enter(ir_call *);
virtual ir_visitor_status visit_enter(ir_return *);
virtual ir_visitor_status visit_enter(ir_function_signature *);
virtual ir_visitor_status visit_enter(ir_if *);
virtual ir_visitor_status visit_enter(ir_loop *);
virtual ir_visitor_status visit_leave(ir_assignment *);
virtual ir_visitor_status visit_leave(ir_expression *);
virtual ir_visitor_status visit_leave(ir_swizzle *);
ir_rvalue *operand_to_temp(ir_rvalue *val);
bool (*predicate)(ir_instruction *ir);
ir_instruction *base_ir;
};
void
do_expression_flattening(exec_list *instructions,
bool (*predicate)(ir_instruction *ir))
{
foreach_iter(exec_list_iterator, iter, *instructions) {
ir_instruction *ir = (ir_instruction *)iter.get();
ir_expression_flattening_visitor v(ir, predicate);
ir->accept(&v);
}
}
ir_rvalue *
ir_expression_flattening_visitor::operand_to_temp(ir_rvalue *ir)
{
void *ctx = base_ir;
ir_variable *var;
ir_assignment *assign;
if (!this->predicate(ir))
return ir;
var = new(ctx) ir_variable(ir->type, "flattening_tmp", ir_var_temporary);
base_ir->insert_before(var);
assign = new(ctx) ir_assignment(new(ctx) ir_dereference_variable(var),
ir,
NULL);
base_ir->insert_before(assign);
return new(ctx) ir_dereference_variable(var);
}
ir_visitor_status
ir_expression_flattening_visitor::visit_enter(ir_function_signature *ir)
{
do_expression_flattening(&ir->body, this->predicate);
return visit_continue_with_parent;
}
ir_visitor_status
ir_expression_flattening_visitor::visit_enter(ir_loop *ir)
{
do_expression_flattening(&ir->body_instructions, this->predicate);
return visit_continue_with_parent;
}
ir_visitor_status
ir_expression_flattening_visitor::visit_enter(ir_if *ir)
{
ir->condition->accept(this);
do_expression_flattening(&ir->then_instructions, this->predicate);
do_expression_flattening(&ir->else_instructions, this->predicate);
return visit_continue_with_parent;
}
ir_visitor_status
ir_expression_flattening_visitor::visit_leave(ir_expression *ir)
{
unsigned int operand;
for (operand = 0; operand < ir->get_num_operands(); operand++) {
/* If the operand matches the predicate, then we'll assign its
* value to a temporary and deref the temporary as the operand.
*/
ir->operands[operand] = operand_to_temp(ir->operands[operand]);
}
return visit_continue;
}
ir_visitor_status
ir_expression_flattening_visitor::visit_leave(ir_assignment *ir)
{
ir->rhs = operand_to_temp(ir->rhs);
if (ir->condition)
ir->condition = operand_to_temp(ir->condition);
return visit_continue;
}
ir_visitor_status
ir_expression_flattening_visitor::visit_leave(ir_swizzle *ir)
{
if (this->predicate(ir->val)) {
ir->val = operand_to_temp(ir->val);
}
return visit_continue;
}
ir_visitor_status
ir_expression_flattening_visitor::visit_enter(ir_call *ir)
{
/* Reminder: iterating ir_call iterates its parameters. */
foreach_iter(exec_list_iterator, iter, *ir) {
ir_rvalue *ir = (ir_rvalue *)iter.get();
ir_rvalue *new_ir = operand_to_temp(ir);
if (new_ir != ir) {
ir->replace_with(new_ir);
}
}
return visit_continue;
}
ir_visitor_status
ir_expression_flattening_visitor::visit_enter(ir_return *ir)
{
if (ir->value)
ir->value = operand_to_temp(ir->value);
return visit_continue;
}
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