| // Copyright 2017 Google Inc. |
| // |
| // 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 CPU_FEATURES_INCLUDE_INTERNAL_BIT_UTILS_H_ |
| #define CPU_FEATURES_INCLUDE_INTERNAL_BIT_UTILS_H_ |
| |
| #include <assert.h> |
| #include <stdbool.h> |
| #include <stdint.h> |
| #include "cpu_features_macros.h" |
| |
| CPU_FEATURES_START_CPP_NAMESPACE |
| |
| inline static bool IsBitSet(uint32_t reg, uint32_t bit) { |
| return (reg >> bit) & 0x1; |
| } |
| |
| inline static uint32_t ExtractBitRange(uint32_t reg, uint32_t msb, |
| uint32_t lsb) { |
| const uint64_t bits = msb - lsb + 1ULL; |
| const uint64_t mask = (1ULL << bits) - 1ULL; |
| assert(msb >= lsb); |
| return (reg >> lsb) & mask; |
| } |
| |
| CPU_FEATURES_END_CPP_NAMESPACE |
| |
| #endif // CPU_FEATURES_INCLUDE_INTERNAL_BIT_UTILS_H_ |