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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_explog_to_explog2.cpp
*
* Many GPUs don't have a base e log or exponent instruction, but they
* do have base 2 versions, so this pass converts exp and log to exp2
* and log2 operations.
*/
#include "main/core.h" /* for log2f on MSVC */
#include "ir.h"
#include "glsl_types.h"
class ir_explog_to_explog2_visitor : public ir_hierarchical_visitor {
public:
ir_explog_to_explog2_visitor()
{
this->progress = false;
}
ir_visitor_status visit_leave(ir_expression *);
bool progress;
};
bool
do_explog_to_explog2(exec_list *instructions)
{
ir_explog_to_explog2_visitor v;
visit_list_elements(&v, instructions);
return v.progress;
}
ir_visitor_status
ir_explog_to_explog2_visitor::visit_leave(ir_expression *ir)
{
if (ir->operation == ir_unop_exp) {
void *mem_ctx = talloc_parent(ir);
ir_constant *log2_e = new(mem_ctx) ir_constant(log2f(M_E));
ir->operation = ir_unop_exp2;
ir->operands[0] = new(mem_ctx) ir_expression(ir_binop_mul,
ir->operands[0]->type,
ir->operands[0],
log2_e);
this->progress = true;
}
if (ir->operation == ir_unop_log) {
void *mem_ctx = talloc_parent(ir);
ir->operation = ir_binop_mul;
ir->operands[0] = new(mem_ctx) ir_expression(ir_unop_log2,
ir->operands[0]->type,
ir->operands[0],
NULL);
ir->operands[1] = new(mem_ctx) ir_constant(1.0f / log2f(M_E));
this->progress = true;
}
return visit_continue;
}
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