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Diffstat (limited to 'src/core/helpers/LUTManager.cpp')
-rw-r--r-- | src/core/helpers/LUTManager.cpp | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/src/core/helpers/LUTManager.cpp b/src/core/helpers/LUTManager.cpp new file mode 100644 index 0000000000..06e35eed8c --- /dev/null +++ b/src/core/helpers/LUTManager.cpp @@ -0,0 +1,79 @@ +/* + * 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 |