6fadba56cc
UTF-8 string is now validated by boost::locale::conv::utf_to_utf, it actually does string conversions which is more than necessary. As observed on Arm server, UTF-8 validation can become bottleneck under heavy loads. This patch introduces a brand new SIMD implementation supporting both NEON and SSE, as well as a naive approach to handle short strings. The naive approach is 3x faster than boost utf_to_utf, whilst SIMD method outperforms naive approach 3x ~ 5x on Arm and x86. Details at https://github.com/cyb70289/utf8/. UTF-8 unit test is added to check various corner cases. Signed-off-by: Yibo Cai <yibo.cai@arm.com> Message-Id: <1543978498-12123-1-git-send-email-yibo.cai@arm.com>
46 lines
1.2 KiB
C++
46 lines
1.2 KiB
C++
/*
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* Leverage SIMD for fast UTF-8 validation with range base algorithm.
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* Details at https://github.com/cyb70289/utf8/.
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*
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* Copyright (c) 2018, Arm Limited and affiliates. All rights reserved.
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <cstdint>
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#include "bytes.hh"
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namespace utils {
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namespace utf8 {
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bool validate(const uint8_t *data, size_t len);
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inline bool validate(bytes_view string) {
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const uint8_t *data = reinterpret_cast<const uint8_t*>(string.data());
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size_t len = string.size();
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return validate(data, len);
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}
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} // namespace utf8
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} // namespace utils
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