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/*
* Copyright (c) 2024 Arm Limited.
*
* SPDX-License-Identifier: MIT
*
* 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 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.
*/
#include "src/core/helpers/LUTManager.h"
namespace arm_compute
{
#ifdef __aarch64__
namespace
{
void init_lut_fp16(ActivationLayerInfo::LookupTable65536 *lut)
{
union Element
{
uint16_t i = 0;
float16_t fp;
} item;
// Fill lut by iterating over all 16 bit values using the union.
while (true)
{
(*lut)[item.i] = 1.f / (1.f + std::exp(-item.fp));
if (item.i == 65535)
break;
item.i++;
}
}
} // namespace
std::shared_ptr<ActivationLayerInfo::LookupTable65536> LUTManager::get_lut_table(LUTInfo info)
{
const auto itr = map_fp16.find(info);
auto s_ptr = (itr != map_fp16.end()) ? itr->second.lock() : nullptr; // nullptr if invalid or not found.
if (s_ptr != nullptr)
{
// Found and valid
return s_ptr; // Return weak ptr as shared ptr
}
else
{
// Not found, or pointer not valid
// We do not use make_shared to prevent the weak_ptr keeping the control block alive
std::shared_ptr<ActivationLayerInfo::LookupTable65536> ptr(new ActivationLayerInfo::LookupTable65536);
init_lut_fp16(ptr.get());
map_fp16[info] = ptr;
return ptr;
}
}
#endif // __aarch64__
// Static function to get LutManager instance
LUTManager &LUTManager::get_instance()
{
static auto inst_ = std::make_unique<LUTManager>(); // The one, single instance.
return *inst_;
}
} // namespace arm_compute
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