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111 lines
3.0 KiB
C++
111 lines
3.0 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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* ricepp is free software: you can redistribute it and/or modify
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* it under the terms of the GNU 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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* ricepp 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 ricepp. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include <cstdint>
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#include <cstdlib>
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#include <iostream>
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#include <stdexcept>
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#include <string_view>
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#include <ricepp/ricepp.h>
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#include "ricepp_cpuspecific.h"
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namespace ricepp {
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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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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
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template <>
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std::unique_ptr<codec_interface<uint16_t>>
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create_codec<uint16_t>(codec_config const& config) {
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switch (get_cpu_variant()) {
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#ifdef RICEPP_CPU_BMI2_AVX512
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case detail::cpu_variant::has_bmi2_avx512:
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show_cpu_variant_once("BMI2+AVX512");
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return detail::create_codec_cpuspecific_<
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uint16_t, detail::cpu_variant::has_bmi2_avx512>(config);
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#endif
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#ifdef RICEPP_CPU_BMI2
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case detail::cpu_variant::has_bmi2:
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show_cpu_variant_once("BMI2");
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return detail::create_codec_cpuspecific_<uint16_t,
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detail::cpu_variant::has_bmi2>(
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config);
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#endif
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default:
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show_cpu_variant_once("fallback");
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return detail::create_codec_cpuspecific_<uint16_t,
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detail::cpu_variant::fallback>(
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config);
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}
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throw std::runtime_error("internal error: unknown CPU variant");
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}
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} // namespace ricepp
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