882d9d1c34
also: - renamed header files to .hpp - updated conformance tests - minor documentation fixes
61 lines
1.5 KiB
C++
61 lines
1.5 KiB
C++
//# This file is a part of toml++ and is subject to the the terms of the MIT license.
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//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
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//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
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// SPDX-License-Identifier: MIT
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#pragma once
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//# {{
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#include "preprocessor.hpp"
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#if !TOML_IMPLEMENTATION
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#error This is an implementation-only header.
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#endif
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//# }}
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#include "unicode.hpp"
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#include "simd.hpp"
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#include "header_start.hpp"
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TOML_IMPL_NAMESPACE_START
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{
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TOML_PURE_GETTER
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TOML_EXTERNAL_LINKAGE
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bool is_ascii(const char* str, size_t len) noexcept
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{
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const char* const end = str + len;
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#if TOML_HAS_SSE2 && (128 % CHAR_BIT) == 0
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{
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constexpr size_t chars_per_vector = 128u / CHAR_BIT;
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if (const size_t simdable = len - (len % chars_per_vector))
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{
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__m128i mask = _mm_setzero_si128();
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for (const char* const e = str + simdable; str < e; str += chars_per_vector)
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{
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const __m128i current_bytes = _mm_loadu_si128(reinterpret_cast<const __m128i*>(str));
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mask = _mm_or_si128(mask, current_bytes);
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}
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const __m128i has_error = _mm_cmpgt_epi8(_mm_setzero_si128(), mask);
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#if TOML_HAS_SSE4_1
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if (!_mm_testz_si128(has_error, has_error))
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return false;
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#else
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if (_mm_movemask_epi8(_mm_cmpeq_epi8(has_error, _mm_setzero_si128())) != 0xFFFF)
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return false;
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#endif
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}
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}
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#endif
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for (; str < end; str++)
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if (static_cast<unsigned char>(*str) > 127u)
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return false;
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return true;
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}
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}
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TOML_IMPL_NAMESPACE_END;
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#include "header_end.hpp"
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