| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you 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. |
| #pragma once |
| |
| #include <cstdint> |
| |
| namespace kudu { |
| |
| // Extract bits from 'a' corresponding to 'mask'. |
| // |
| // This is a software implementation of the 'PEXT' instruction |
| // from the BMI2 instruction set. |
| // |
| // This implementation uses the CLMUL instruction set. Callers should |
| // verify that the instruction is present (eg using base::CPU) before |
| // calling. |
| uint64_t zp7_pext_64_clmul(uint64_t a, uint64_t mask); |
| |
| // This implementation is slower but doesn't require any special instructions. |
| uint64_t zp7_pext_64_simple(uint64_t a, uint64_t mask); |
| |
| } // namespace kudu |
