randomx/src/cpu.cpp

/*
Copyright (c) 2019, tevador <tevador@gmail.com>

All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
	* Redistributions of source code must retain the above copyright
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	* Redistributions in binary form must reproduce the above copyright
	  notice, this list of conditions and the following disclaimer in the
	  documentation and/or other materials provided with the distribution.
	* Neither the name of the copyright holder nor the
	  names of its contributors may be used to endorse or promote products
	  derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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*/

#include "cpu.hpp"

#if defined(_M_X64) || defined(__x86_64__)
	#define HAVE_CPUID
	#ifdef _WIN32
		#include <intrin.h>
		#define cpuid(info, x) __cpuidex(info, x, 0)
	#else //GCC
		#include <cpuid.h>
		void cpuid(int info[4], int InfoType) {
			__cpuid_count(InfoType, 0, info[0], info[1], info[2], info[3]);
		}
	#endif
#endif

#if defined(HAVE_HWCAP)
	#include <sys/auxv.h>
	#include <asm/hwcap.h>
#endif

namespace randomx {

	Cpu::Cpu() : aes_(false), ssse3_(false), avx2_(false) {
#ifdef HAVE_CPUID
		int info[4];
		cpuid(info, 0);
		int nIds = info[0];
		if (nIds >= 0x00000001) {
			cpuid(info, 0x00000001);
			ssse3_ = (info[2] & (1 << 9)) != 0;
			aes_ = (info[2] & (1 << 25)) != 0;
		}
		if (nIds >= 0x00000007) {
			cpuid(info, 0x00000007);
			avx2_ = (info[1] & (1 << 5)) != 0;
		}
#elif defined(__aarch64__) && defined(HWCAP_AES)
		long hwcaps = getauxval(AT_HWCAP);
		aes_ = (hwcaps & HWCAP_AES) != 0;
#endif
		//TODO POWER8 AES
	}

}