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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 lower_mod_to_fract.cpp
*
* Breaks an ir_unop_mod expression down to (op1 * fract(op0 / op1))
*
* Many GPUs don't have a MOD instruction (945 and 965 included), and
* if we have to break it down like this anyway, it gives an
* opportunity to do things like constant fold the (1.0 / op1) easily.
*/
#include "ir.h"
class ir_mod_to_fract_visitor : public ir_hierarchical_visitor {
public:
ir_mod_to_fract_visitor()
{
this->made_progress = false;
}
ir_visitor_status visit_leave(ir_expression *);
bool made_progress;
};
bool
do_mod_to_fract(exec_list *instructions)
{
ir_mod_to_fract_visitor v;
visit_list_elements(&v, instructions);
return v.made_progress;
}
ir_visitor_status
ir_mod_to_fract_visitor::visit_leave(ir_expression *ir)
{
if (ir->operation != ir_binop_mod)
return visit_continue;
ir_variable *temp = new(ir) ir_variable(ir->operands[1]->type, "mod_b",
ir_var_temporary);
this->base_ir->insert_before(temp);
ir_assignment *assign;
ir_rvalue *expr;
assign = new(ir) ir_assignment(new(ir) ir_dereference_variable(temp),
ir->operands[1], NULL);
this->base_ir->insert_before(assign);
expr = new(ir) ir_expression(ir_binop_div,
ir->operands[0]->type,
ir->operands[0],
new(ir) ir_dereference_variable(temp));
expr = new(ir) ir_expression(ir_unop_fract,
ir->operands[0]->type,
expr,
NULL);
ir->operation = ir_binop_mul;
ir->operands[0] = new(ir) ir_dereference_variable(temp);
ir->operands[1] = expr;
this->made_progress = true;
return visit_continue;
}
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