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#include "config.h"
#include "cpu_caps.h"
#if defined(_WIN32) && (defined(_M_ARM) || defined(_M_ARM64))
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#ifndef PF_ARM_NEON_INSTRUCTIONS_AVAILABLE
#define PF_ARM_NEON_INSTRUCTIONS_AVAILABLE 19
#endif
#endif
#ifdef HAVE_INTRIN_H
#include <intrin.h>
#endif
#ifdef HAVE_CPUID_H
#include <cpuid.h>
#endif
#include <cctype>
#include <string>
#include "alfstream.h"
#include "logging.h"
int CPUCapFlags{0};
namespace {
#if defined(HAVE_GCC_GET_CPUID) \
&& (defined(__i386__) || defined(__x86_64__) || defined(_M_IX86) || defined(_M_X64))
using reg_type = unsigned int;
inline std::array<reg_type,4> get_cpuid(unsigned int f)
{
std::array<reg_type,4> ret{};
__get_cpuid(f, &ret[0], &ret[1], &ret[2], &ret[3]);
return ret;
}
#define CAN_GET_CPUID
#elif defined(HAVE_CPUID_INTRINSIC) \
&& (defined(__i386__) || defined(__x86_64__) || defined(_M_IX86) || defined(_M_X64))
using reg_type = int;
inline std::array<reg_type,4> get_cpuid(unsigned int f)
{
std::array<reg_type,4> ret{};
(__cpuid)(ret.data(), f);
return ret;
}
#define CAN_GET_CPUID
#endif
} // namespace
al::optional<CPUInfo> GetCPUInfo()
{
CPUInfo ret;
#ifdef CAN_GET_CPUID
auto cpuregs = get_cpuid(0);
if(cpuregs[0] == 0)
return al::nullopt;
const reg_type maxfunc{cpuregs[0]};
cpuregs = get_cpuid(0x80000000);
const reg_type maxextfunc{cpuregs[0]};
ret.mVendor.append(reinterpret_cast<char*>(&cpuregs[1]), 4);
ret.mVendor.append(reinterpret_cast<char*>(&cpuregs[3]), 4);
ret.mVendor.append(reinterpret_cast<char*>(&cpuregs[2]), 4);
auto iter_end = std::remove(ret.mVendor.begin(), ret.mVendor.end(), '\0');
while(iter_end != ret.mVendor.begin() && std::isspace(*iter_end))
--iter_end;
iter_end = std::unique(ret.mVendor.begin(), iter_end,
[](auto&& c0, auto&& c1) { return std::isspace(c0) && std::isspace(c1); });
ret.mVendor.erase(iter_end, ret.mVendor.end());
if(!ret.mVendor.empty() && std::isspace(ret.mVendor.front()))
ret.mVendor.erase(ret.mVendor.begin());
if(maxextfunc >= 0x80000004)
{
cpuregs = get_cpuid(0x80000002);
ret.mName.append(reinterpret_cast<char*>(cpuregs.data()), 16);
cpuregs = get_cpuid(0x80000003);
ret.mName.append(reinterpret_cast<char*>(cpuregs.data()), 16);
cpuregs = get_cpuid(0x80000004);
ret.mName.append(reinterpret_cast<char*>(cpuregs.data()), 16);
iter_end = std::remove(ret.mName.begin(), ret.mName.end(), '\0');
while(iter_end != ret.mName.begin() && std::isspace(*iter_end))
--iter_end;
iter_end = std::unique(ret.mName.begin(), iter_end,
[](auto&& c0, auto&& c1) { return std::isspace(c0) && std::isspace(c1); });
ret.mName.erase(iter_end, ret.mName.end());
if(!ret.mName.empty() && std::isspace(ret.mName.front()))
ret.mName.erase(ret.mName.begin());
}
if(maxfunc >= 1)
{
cpuregs = get_cpuid(1);
if((cpuregs[3]&(1<<25)))
ret.mCaps |= CPU_CAP_SSE;
if((ret.mCaps&CPU_CAP_SSE) && (cpuregs[3]&(1<<26)))
ret.mCaps |= CPU_CAP_SSE2;
if((ret.mCaps&CPU_CAP_SSE2) && (cpuregs[2]&(1<<0)))
ret.mCaps |= CPU_CAP_SSE3;
if((ret.mCaps&CPU_CAP_SSE3) && (cpuregs[2]&(1<<19)))
ret.mCaps |= CPU_CAP_SSE4_1;
}
#else
/* Assume support for whatever's supported if we can't check for it */
#if defined(HAVE_SSE4_1)
#warning "Assuming SSE 4.1 run-time support!"
ret.mCaps |= CPU_CAP_SSE | CPU_CAP_SSE2 | CPU_CAP_SSE3 | CPU_CAP_SSE4_1;
#elif defined(HAVE_SSE3)
#warning "Assuming SSE 3 run-time support!"
ret.mCaps |= CPU_CAP_SSE | CPU_CAP_SSE2 | CPU_CAP_SSE3;
#elif defined(HAVE_SSE2)
#warning "Assuming SSE 2 run-time support!"
ret.mCaps |= CPU_CAP_SSE | CPU_CAP_SSE2;
#elif defined(HAVE_SSE)
#warning "Assuming SSE run-time support!"
ret.mCaps |= CPU_CAP_SSE;
#endif
#endif /* CAN_GET_CPUID */
#ifdef HAVE_NEON
#ifdef __ARM_NEON
ret.mCaps |= CPU_CAP_NEON;
#elif defined(_WIN32) && (defined(_M_ARM) || defined(_M_ARM64))
if(IsProcessorFeaturePresent(PF_ARM_NEON_INSTRUCTIONS_AVAILABLE))
ret.mCaps |= CPU_CAP_NEON;
#else
al::ifstream file{"/proc/cpuinfo"};
if(!file.is_open())
return al::nullopt;
auto getline = [](std::istream &f, std::string &output) -> bool
{
while(f.good() && f.peek() == '\n')
f.ignore();
return std::getline(f, output) && !output.empty();
};
std::string features;
while(getline(file, features))
{
if(features.compare(0, 10, "Features\t:", 10) == 0)
break;
}
file.close();
size_t extpos{9};
while((extpos=features.find("neon", extpos+1)) != std::string::npos)
{
if(std::isspace(features[extpos-1])
&& (extpos+4 == features.length() || std::isspace(features[extpos+4])))
{
ret.mCaps |= CPU_CAP_NEON;
break;
}
}
if(!(ret.mCaps&CPU_CAP_NEON))
{
extpos = 9;
while((extpos=features.find("asimd", extpos+1)) != std::string::npos)
{
if(std::isspace(features[extpos-1])
&& (extpos+5 == features.length() || std::isspace(features[extpos+5])))
{
ret.mCaps |= CPU_CAP_NEON;
break;
}
}
}
#endif
#endif
return al::make_optional(ret);
}
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