//
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// Copyright (c) 2017 Vinnie Falco (vinnie dot falco at gmail dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// Official repository: https://github.com/boostorg/beast
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//
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#ifndef BOOST_BEAST_DETAIL_CPU_INFO_HPP
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#define BOOST_BEAST_DETAIL_CPU_INFO_HPP
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#include <boost/config.hpp>
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#ifndef BOOST_BEAST_NO_INTRINSICS
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# if defined(BOOST_MSVC) || ((defined(BOOST_GCC) || defined(BOOST_CLANG)) && defined(__SSE4_2__))
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# define BOOST_BEAST_NO_INTRINSICS 0
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# else
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# define BOOST_BEAST_NO_INTRINSICS 1
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# endif
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#endif
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#if ! BOOST_BEAST_NO_INTRINSICS
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#ifdef BOOST_MSVC
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#include <intrin.h> // __cpuid
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#else
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#include <cpuid.h> // __get_cpuid
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#endif
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namespace boost {
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namespace beast {
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namespace detail {
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/* Portions from Boost,
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Copyright Andrey Semashev 2007 - 2015.
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*/
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template<class = void>
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void
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cpuid(
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std::uint32_t id,
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std::uint32_t& eax,
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std::uint32_t& ebx,
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std::uint32_t& ecx,
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std::uint32_t& edx)
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{
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#ifdef BOOST_MSVC
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int regs[4];
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__cpuid(regs, id);
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eax = regs[0];
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ebx = regs[1];
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ecx = regs[2];
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edx = regs[3];
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#else
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__get_cpuid(id, &eax, &ebx, &ecx, &edx);
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#endif
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}
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struct cpu_info
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{
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bool sse42 = false;
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cpu_info();
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};
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inline
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cpu_info::
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cpu_info()
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{
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constexpr std::uint32_t SSE42 = 1 << 20;
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std::uint32_t eax = 0;
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std::uint32_t ebx = 0;
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std::uint32_t ecx = 0;
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std::uint32_t edx = 0;
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cpuid(0, eax, ebx, ecx, edx);
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if(eax >= 1)
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{
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cpuid(1, eax, ebx, ecx, edx);
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sse42 = (ecx & SSE42) != 0;
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}
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}
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template<class = void>
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cpu_info const&
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get_cpu_info()
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{
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static cpu_info const ci;
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return ci;
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}
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} // detail
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} // beast
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} // boost
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#endif
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#endif
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