cpu.cpp

Go to the documentation of this file.

/*
 * The ManaPlus Client
 * Copyright (C) 2013-2019 The ManaPlus Developers
 * Copyright (C) 2019-2021 Andrei Karas
 *
 * This file is part of The ManaPlus Client.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "utils/cpu.h"
 
#include "logger.h"
 
#if (defined(__amd64__) || defined(__i386__)) && defined(__GNUC__) \
 && (GCC_VERSION >= 40800) && !defined(ANDROID)
// nothing
#elif defined(__linux__) || defined(__linux)
#include "utils/foreach.h"
#include "utils/stringutils.h"
#endif // (defined(__amd64__) || defined(__i386__)) && defined(__GNUC__)
 // && (GCC_VERSION >= 40800) && !defined(ANDROID)
 
#ifdef USE_SDL2
#include <SDL_cpuinfo.h>
#endif // USE_SDL2
 
#include "debug.h"
 
namespace
{
 uint32_t mCpuFlags;
} // namespace
 
void Cpu::detect()
{
#if (defined(__amd64__) || defined(__i386__)) && defined(__GNUC__) \
 && (GCC_VERSION >= 40800) && !defined(ANDROID)
 __builtin_cpu_init();
 if (__builtin_cpu_supports ("mmx"))
 mCpuFlags |= FEATURE_MMX;
 if (__builtin_cpu_supports ("sse"))
 mCpuFlags |= FEATURE_SSE;
 if (__builtin_cpu_supports ("sse2"))
 mCpuFlags |= FEATURE_SSE2;
 if (__builtin_cpu_supports ("ssse3"))
 mCpuFlags |= FEATURE_SSSE3;
 if (__builtin_cpu_supports ("sse4.1"))
 mCpuFlags |= FEATURE_SSE4;
 if (__builtin_cpu_supports ("sse4.2"))
 mCpuFlags |= FEATURE_SSE42;
 if (__builtin_cpu_supports ("avx"))
 mCpuFlags |= FEATURE_AVX;
 if (__builtin_cpu_supports ("avx2"))
 mCpuFlags |= FEATURE_AVX2;
 printFlags();
#elif defined(__linux__) || defined(__linux)
 FILE *file = fopen("/proc/cpuinfo", "r");
 char buf[1001];
 if (file == nullptr)
 return;
 while (fgets(buf, 1000, file) != nullptr)
 {
 std::string str = buf;
 if (findFirst(str, "flags"))
 {
 size_t idx = str.find(':');
 if (idx == std::string::npos)
 continue;
 str = str.substr(idx + 1);
 trim(str);
 StringVect vect;
 splitToStringVector(vect, str, ' ');
 FOR_EACH (StringVectCIter, it, vect)
 {
 const std::string &flag = *it;
 if (flag == "mmx")
 mCpuFlags |= FEATURE_MMX;
 else if (flag == "sse")
 mCpuFlags |= FEATURE_SSE;
 else if (flag == "sse2")
 mCpuFlags |= FEATURE_SSE2;
 else if (flag == "ssse3")
 mCpuFlags |= FEATURE_SSSE3;
 else if (flag == "sse4_1")
 mCpuFlags |= FEATURE_SSE4;
 else if (flag == "sse4_2")
 mCpuFlags |= FEATURE_SSE42;
 else if (flag == "avx")
 mCpuFlags |= FEATURE_AVX;
 else if (flag == "avx2")
 mCpuFlags |= FEATURE_AVX2;
 }
 fclose(file);
 printFlags();
 return;
 }
 }
 fclose(file);
 if (logger != nullptr)
 logger->log("cpu features was not detected");
#else // OTHER
 
#ifdef USE_SDL2
 if (SDL_HasMMX())
 mCpuFlags |= FEATURE_MMX;
 if (SDL_HasSSE())
 mCpuFlags |= FEATURE_SSE;
 if (SDL_HasSSE2())
 mCpuFlags |= FEATURE_SSE2;
 if (SDL_HasSSE3())
 mCpuFlags |= FEATURE_SSSE3;
 if (SDL_HasSSE41())
 mCpuFlags |= FEATURE_SSE4;
 if (SDL_HasSSE42())
 mCpuFlags |= FEATURE_SSE42;
 
#if SDL_VERSION_ATLEAST(2, 0, 2)
 if (SDL_HasAVX())
 mCpuFlags |= FEATURE_AVX;
#endif // SDL_VERSION_ATLEAST(2, 0, 2)
#if SDL_VERSION_ATLEAST(2, 0, 4)
 if (SDL_HasAVX2())
 mCpuFlags |= FEATURE_AVX2;
#endif // SDL_VERSION_ATLEAST(2, 0, 4)
 
 printFlags();
#else // USE_SDL2
 
 if (logger)
 logger->log("cpu features not supported");
#endif // USE_SDL2
#endif // (defined(__amd64__) || defined(__i386__)) && defined(__GNUC__)
 // && (GCC_VERSION >= 40800) && !defined(ANDROID)
 
#if SDL_VERSION_ATLEAST(2, 0, 1)
 logger->log("System ram size: %d", SDL_GetSystemRAM());
#endif // SDL_VERSION_ATLEAST(2, 0, 1)
}
 
void Cpu::printFlags()
{
 if (logger == nullptr)
 return;
 std::string str("CPU features:");
 if ((mCpuFlags & FEATURE_MMX) != 0U)
 str.append(" mmx");
 if ((mCpuFlags & FEATURE_SSE) != 0U)
 str.append(" sse");
 if ((mCpuFlags & FEATURE_SSE2) != 0U)
 str.append(" sse2");
 if ((mCpuFlags & FEATURE_SSSE3) != 0U)
 str.append(" ssse3");
 if ((mCpuFlags & FEATURE_SSE4) != 0U)
 str.append(" sse4");
 if ((mCpuFlags & FEATURE_SSE42) != 0U)
 str.append(" sse4_2");
 if ((mCpuFlags & FEATURE_AVX) != 0U)
 str.append(" avx");
 if ((mCpuFlags & FEATURE_AVX2) != 0U)
 str.append(" avx2");
 logger->log(str);
}
 
uint32_t Cpu::getFlags()
{
 return mCpuFlags;
}