| // Copyright 2012 Cloudera, 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. |
| // |
| // 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 IMPALA_BIT_UTIL_H |
| #define IMPALA_BIT_UTIL_H |
| |
| #include <stdint.h> |
| #include "kudu/gutil/port.h" |
| |
| namespace kudu { |
| |
| // Utility class to do standard bit tricks |
| // TODO: is this in boost or something else like that? |
| class BitUtil { |
| public: |
| // Returns the ceil of value/divisor |
| static inline int Ceil(int value, int divisor) { |
| return value / divisor + (value % divisor != 0); |
| } |
| |
| // Returns the 'num_bits' least-significant bits of 'v'. |
| static inline uint64_t TrailingBits(uint64_t v, int num_bits) { |
| if (PREDICT_FALSE(num_bits == 0)) return 0; |
| if (PREDICT_FALSE(num_bits >= 64)) return v; |
| int n = 64 - num_bits; |
| return (v << n) >> n; |
| } |
| }; |
| |
| } // namespace kudu |
| |
| #endif |