| // Copyright 2020 The Pigweed Authors |
| // |
| // 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 |
| // |
| // https://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. |
| #pragma once |
| |
| // PW_SYNC_YIELD_CORE_FOR_SMT provides the architecture specific processor hint |
| // to allow the processor to yield in the case of SMT. |
| #if defined(__x86_64__) || defined(__i386__) |
| #include <immintrin.h> |
| #define PW_SYNC_YIELD_CORE_FOR_SMT() _mm_pause() |
| |
| #elif defined(__aarch64__) || defined(__arm__) |
| #define PW_SYNC_YIELD_CORE_FOR_SMT() asm volatile("yield" ::: "memory") |
| |
| #else |
| #error "No processor yield implementation for this architecture." |
| |
| #endif // PW_SYNC_YIELD_CORE_FOR_SMT |
