fcb8d040e8
Instead of lengthy blurbs, switch to single-line, machine-readable standardized (https://spdx.dev) license identifiers. The Linux kernel switched long ago, so there is strong precedent. Three cases are handled: AGPL-only, Apache-only, and dual licensed. For the latter case, I chose (AGPL-3.0-or-later and Apache-2.0), reasoning that our changes are extensive enough to apply our license. The changes we applied mechanically with a script, except to licenses/README.md. Closes #9937
61 lines
1.5 KiB
C++
61 lines
1.5 KiB
C++
/*
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* Copyright (C) 2020-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#pragma once
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#include <cstdint>
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#include <limits>
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namespace utils {
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static constexpr int64_t simple_key_unused_value = std::numeric_limits<int64_t>::min();
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/*
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* array_search_gt(value, array, capacity, size)
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*
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* Returns the index of the first element in the array that's greater
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* than the given value.
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*
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* To accomodate the single-instruction-multiple-data variant, observe
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* the following:
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* - capacity must be a multiple of 4
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* - any items with indexes in [size, capacity) must be initialized
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* to std::numeric_limits<int64_t>::min()
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*/
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int array_search_gt(int64_t val, const int64_t* array, const int capacity, const int size);
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static inline unsigned array_search_4_eq(uint8_t val, const uint8_t* array) {
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// Unrolled loop is few %s faster
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if (array[0] == val) {
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return 0;
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} else if (array[1] == val) {
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return 1;
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} else if (array[2] == val) {
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return 2;
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} else if (array[3] == val) {
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return 3;
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} else {
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return 4;
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}
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}
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static inline unsigned array_search_8_eq(uint8_t val, const uint8_t* array) {
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for (unsigned i = 0; i < 8; i++) {
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if (array[i] == val) {
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return i;
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}
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}
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return 8;
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}
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unsigned array_search_16_eq(uint8_t val, const uint8_t* array);
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unsigned array_search_32_eq(uint8_t val, const uint8_t* array);
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unsigned array_search_x32_eq(uint8_t val, const uint8_t* array, int nr);
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}
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