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84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
/* vim:set ts=2 sw=2 sts=2 et: */
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/**
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* \author Marcus Holland-Moritz (github@mhxnet.de)
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* \copyright Copyright (c) Marcus Holland-Moritz
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*
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* This file is part of ricepp.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the “Software”), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* SPDX-License-Identifier: MIT
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*/
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#include <cstdlib>
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#include <iostream>
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#include "cpu_variant.h"
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namespace ricepp::detail {
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namespace {
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detail::cpu_variant get_cpu_variant_init() {
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#ifndef _WIN32
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#if defined(__has_builtin)
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#if __has_builtin(__builtin_cpu_supports) && \
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(defined(RICEPP_CPU_BMI2) || defined(RICEPP_CPU_BMI2_AVX512))
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__builtin_cpu_init();
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bool const has_avx512vl = __builtin_cpu_supports("avx512vl");
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bool const has_avx512vbmi = __builtin_cpu_supports("avx512vbmi");
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bool const has_bmi2 = __builtin_cpu_supports("bmi2");
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if (has_avx512vl && has_avx512vbmi && has_bmi2) {
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return detail::cpu_variant::has_bmi2_avx512;
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}
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if (has_bmi2) {
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return detail::cpu_variant::has_bmi2;
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}
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#endif
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#endif
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#endif
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return detail::cpu_variant::fallback;
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}
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} // namespace
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detail::cpu_variant get_cpu_variant() {
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static detail::cpu_variant const variant = get_cpu_variant_init();
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return variant;
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}
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void show_cpu_variant(std::string_view variant) {
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if (std::getenv("RICEPP_SHOW_CPU_VARIANT")) {
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std::cerr << "ricepp: using " << variant << " CPU variant\n";
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}
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}
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void show_cpu_variant_once(std::string_view variant) {
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static auto const _ = [&variant]() {
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show_cpu_variant(variant);
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return true;
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}();
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}
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} // namespace ricepp::detail
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