1 | /* Copyright 2021 Google LLC. All Rights Reserved. |
2 | |
3 | Licensed under the Apache License, Version 2.0 (the "License"); |
4 | you may not use this file except in compliance with the License. |
5 | You may obtain a copy of the License at |
6 | |
7 | http://www.apache.org/licenses/LICENSE-2.0 |
8 | |
9 | Unless required by applicable law or agreed to in writing, software |
10 | distributed under the License is distributed on an "AS IS" BASIS, |
11 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
12 | See the License for the specific language governing permissions and |
13 | limitations under the License. |
14 | ==============================================================================*/ |
15 | #ifndef RUY_RUY_DENORMAL_H_ |
16 | #define RUY_RUY_DENORMAL_H_ |
17 | |
18 | #include <cstdint> |
19 | |
20 | namespace ruy { |
21 | // NOTE: the following 'fpu_state' struct is copied from |
22 | // pthreadpool/src/threadpool-utils.h that's not exposed by the pthreadpool |
23 | // library (https://github.com/Maratyszcza/pthreadpool). |
24 | struct fpu_state { |
25 | #if defined(__SSE__) || defined(__x86_64__) || defined(_M_X64) || \ |
26 | (defined(_M_IX86_FP) && _M_IX86_FP >= 1) |
27 | std::uint32_t mxcsr; |
28 | #elif defined(__GNUC__) && defined(__arm__) && defined(__ARM_FP) && \ |
29 | (__ARM_FP != 0) || \ |
30 | defined(_MSC_VER) && defined(_M_ARM) |
31 | std::uint32_t fpscr; |
32 | #elif defined(__GNUC__) && defined(__aarch64__) || \ |
33 | defined(_MSC_VER) && defined(_M_ARM64) |
34 | std::uint64_t fpcr; |
35 | #endif |
36 | }; |
37 | |
38 | // While this class is active, denormal floating point numbers are suppressed. |
39 | // The destructor restores the original flags. |
40 | class ScopedSuppressDenormals { |
41 | public: |
42 | ScopedSuppressDenormals(); |
43 | ~ScopedSuppressDenormals(); |
44 | |
45 | private: |
46 | fpu_state restore_; |
47 | |
48 | ScopedSuppressDenormals(const ScopedSuppressDenormals&) = delete; |
49 | void operator=(const ScopedSuppressDenormals&) = delete; |
50 | }; |
51 | } // namespace ruy |
52 | |
53 | #endif // RUY_RUY_DENORMAL_H_ |
54 | |