| /* Copyright 2021 Google LLC. 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. |
| ==============================================================================*/ |
| #ifndef RUY_RUY_DENORMAL_H_ |
| #define RUY_RUY_DENORMAL_H_ |
| |
| #include <cstdint> |
| |
| namespace ruy { |
| // NOTE: the following 'fpu_state' struct is copied from |
| // pthreadpool/src/threadpool-utils.h that's not exposed by the pthreadpool |
| // library (https://github.com/Maratyszcza/pthreadpool). |
| struct fpu_state { |
| #if defined(__SSE__) || defined(__x86_64__) || defined(_M_X64) || \ |
| (defined(_M_IX86_FP) && _M_IX86_FP >= 1) |
| std::uint32_t mxcsr; |
| #elif defined(__GNUC__) && defined(__arm__) && defined(__ARM_FP) && \ |
| (__ARM_FP != 0) || \ |
| defined(_MSC_VER) && defined(_M_ARM) |
| std::uint32_t fpscr; |
| #elif defined(__GNUC__) && defined(__aarch64__) || \ |
| defined(_MSC_VER) && defined(_M_ARM64) |
| std::uint64_t fpcr; |
| #endif |
| }; |
| |
| // While this class is active, denormal floating point numbers are suppressed. |
| // The destructor restores the original flags. |
| class ScopedSuppressDenormals { |
| public: |
| ScopedSuppressDenormals(); |
| ~ScopedSuppressDenormals(); |
| |
| private: |
| fpu_state restore_; |
| |
| ScopedSuppressDenormals(const ScopedSuppressDenormals&) = delete; |
| void operator=(const ScopedSuppressDenormals&) = delete; |
| }; |
| } // namespace ruy |
| |
| #endif // RUY_RUY_DENORMAL_H_ |