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/*
* Copyright (c) 2018 Samsung Electronics Co., Ltd. All Rights Reserved
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "nncc/core/ADT/kernel/IndexEnumerator.h"
#include <cassert>
#include <algorithm>
namespace nncc
{
namespace core
{
namespace ADT
{
namespace kernel
{
IndexEnumerator::IndexEnumerator(const Shape &shape) : _cursor(0)
{
_max[0] = shape.width();
_max[1] = shape.height();
_max[2] = shape.depth();
_max[3] = shape.count();
std::fill(_cur, _cur + 4, 0);
// NOTE Null dimension should NOT exist
assert(std::find(_max, _max + 4, 0) == (_max + 4));
}
bool IndexEnumerator::valid(void) const { return _cursor < 4; }
uint32_t IndexEnumerator::count(void) const { return _cur[3]; }
uint32_t IndexEnumerator::depth(void) const { return _cur[2]; }
uint32_t IndexEnumerator::height(void) const { return _cur[1]; }
uint32_t IndexEnumerator::width(void) const { return _cur[0]; }
void IndexEnumerator::advance(void)
{
while (_cursor < 4)
{
if (_cur[_cursor] + 1 < _max[_cursor])
{
break;
}
++_cursor;
}
if (_cursor == 4)
{
return;
}
// Increment index
_cur[_cursor] += 1;
// Reset indices for lower dimensions
for (uint32_t head = 0; head < _cursor; ++head)
{
_cur[head] = 0;
}
// Reset cursor
_cursor = 0;
}
} // namespace kernel
} // namespace ADT
} // namespace core
} // namespace nncc
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