| /* |
| * 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 |