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/*
* mptCPU.cpp
* ----------
* Purpose: CPU feature detection.
* Notes : (currently none)
* Authors: OpenMPT Devs
* The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
*/
#include "stdafx.h"
#include "mptCPU.h"
#include "../common/mptStringBuffer.h"
#if defined(MPT_ENABLE_ARCH_INTRINSICS)
#if MPT_COMPILER_MSVC && (defined(MPT_ENABLE_ARCH_X86) || defined(MPT_ENABLE_ARCH_AMD64))
#include <intrin.h>
#endif // MPT_COMPILER_MSVC && (MPT_ENABLE_ARCH_X86 || MPT_ENABLE_ARCH_AMD64)
#endif // MPT_ENABLE_ARCH_INTRINSICS
OPENMPT_NAMESPACE_BEGIN
namespace CPU
{
#if defined(MPT_ENABLE_ARCH_INTRINSICS)
uint32 EnabledFeatures = 0;
#if MPT_COMPILER_MSVC && (defined(MPT_ENABLE_ARCH_X86) || defined(MPT_ENABLE_ARCH_AMD64))
typedef char cpuid_result_string[12];
struct cpuid_result {
uint32 a;
uint32 b;
uint32 c;
uint32 d;
std::string as_string() const
{
cpuid_result_string result;
result[0+0] = (b >> 0) & 0xff;
result[0+1] = (b >> 8) & 0xff;
result[0+2] = (b >>16) & 0xff;
result[0+3] = (b >>24) & 0xff;
result[4+0] = (d >> 0) & 0xff;
result[4+1] = (d >> 8) & 0xff;
result[4+2] = (d >>16) & 0xff;
result[4+3] = (d >>24) & 0xff;
result[8+0] = (c >> 0) & 0xff;
result[8+1] = (c >> 8) & 0xff;
result[8+2] = (c >>16) & 0xff;
result[8+3] = (c >>24) & 0xff;
return std::string(result, result + 12);
}
std::string as_string4() const
{
std::string result;
result.push_back(static_cast<uint8>((a >> 0) & 0xff));
result.push_back(static_cast<uint8>((a >> 8) & 0xff));
result.push_back(static_cast<uint8>((a >> 16) & 0xff));
result.push_back(static_cast<uint8>((a >> 24) & 0xff));
result.push_back(static_cast<uint8>((b >> 0) & 0xff));
result.push_back(static_cast<uint8>((b >> 8) & 0xff));
result.push_back(static_cast<uint8>((b >> 16) & 0xff));
result.push_back(static_cast<uint8>((b >> 24) & 0xff));
result.push_back(static_cast<uint8>((c >> 0) & 0xff));
result.push_back(static_cast<uint8>((c >> 8) & 0xff));
result.push_back(static_cast<uint8>((c >> 16) & 0xff));
result.push_back(static_cast<uint8>((c >> 24) & 0xff));
result.push_back(static_cast<uint8>((d >> 0) & 0xff));
result.push_back(static_cast<uint8>((d >> 8) & 0xff));
result.push_back(static_cast<uint8>((d >> 16) & 0xff));
result.push_back(static_cast<uint8>((d >> 24) & 0xff));
return result;
}
};
static cpuid_result cpuid(uint32 function)
{
cpuid_result result;
int CPUInfo[4];
__cpuid(CPUInfo, function);
result.a = CPUInfo[0];
result.b = CPUInfo[1];
result.c = CPUInfo[2];
result.d = CPUInfo[3];
return result;
}
static cpuid_result cpuidex(uint32 function_a, uint32 function_c)
{
cpuid_result result;
int CPUInfo[4];
__cpuidex(CPUInfo, function_a, function_c);
result.a = CPUInfo[0];
result.b = CPUInfo[1];
result.c = CPUInfo[2];
result.d = CPUInfo[3];
return result;
}
Info::Info()
{
cpuid_result VendorString = cpuid(0x00000000u);
mpt::String::WriteAutoBuf(VendorID) = VendorString.as_string();
if(VendorString.a >= 0x00000001u)
{
cpuid_result StandardFeatureFlags = cpuid(0x00000001u);
CPUID = StandardFeatureFlags.a;
uint32 BaseStepping = (StandardFeatureFlags.a >> 0) & 0x0f;
uint32 BaseModel = (StandardFeatureFlags.a >> 4) & 0x0f;
uint32 BaseFamily = (StandardFeatureFlags.a >> 8) & 0x0f;
uint32 ExtModel = (StandardFeatureFlags.a >> 16) & 0x0f;
uint32 ExtFamily = (StandardFeatureFlags.a >> 20) & 0xff;
if(BaseFamily == 0xf)
{
Family = static_cast<uint16>(ExtFamily + BaseFamily);
} else
{
Family = static_cast<uint16>(BaseFamily);
}
if((BaseFamily == 0x6) || (BaseFamily == 0xf))
{
Model = static_cast<uint8>((ExtModel << 4) | (BaseModel << 0));
} else
{
Model = static_cast<uint8>(BaseModel);
}
Stepping = static_cast<uint8>(BaseStepping);
if(StandardFeatureFlags.d & (1<<23)) AvailableFeatures |= feature::mmx;
if(StandardFeatureFlags.d & (1<<25)) AvailableFeatures |= feature::sse;
if(StandardFeatureFlags.d & (1<<26)) AvailableFeatures |= feature::sse2;
if(StandardFeatureFlags.c & (1<< 0)) AvailableFeatures |= feature::sse3;
if(StandardFeatureFlags.c & (1<< 9)) AvailableFeatures |= feature::ssse3;
if(StandardFeatureFlags.c & (1<<19)) AvailableFeatures |= feature::sse4_1;
if(StandardFeatureFlags.c & (1<<20)) AvailableFeatures |= feature::sse4_2;
if(StandardFeatureFlags.c & (1<<28)) AvailableFeatures |= feature::avx;
}
if(VendorString.a >= 0x00000007u)
{
cpuid_result ExtendedFeatures = cpuidex(0x00000007u, 0x00000000u);
if(ExtendedFeatures.b & (1<< 5)) AvailableFeatures |= feature::avx2;
}
cpuid_result ExtendedVendorString = cpuid(0x80000000u);
if(ExtendedVendorString.a >= 0x80000001u)
{
cpuid_result ExtendedFeatureFlags = cpuid(0x80000001u);
if(ExtendedFeatureFlags.d & (1<<29)) AvailableFeatures |= feature::lm;
}
if(ExtendedVendorString.a >= 0x80000004u)
{
mpt::String::WriteAutoBuf(BrandID) = cpuid(0x80000002u).as_string4() + cpuid(0x80000003u).as_string4() + cpuid(0x80000004u).as_string4();
}
}
#elif MPT_COMPILER_MSVC && (defined(MPT_ENABLE_ARCH_X86) || defined(MPT_ENABLE_ARCH_AMD64))
Info::Info()
{
if(IsProcessorFeaturePresent(PF_MMX_INSTRUCTIONS_AVAILABLE) != 0) AvailableFeatures |= feature::mmx;
if(IsProcessorFeaturePresent(PF_XMMI_INSTRUCTIONS_AVAILABLE) != 0) AvailableFeatures |= feature::sse;
if(IsProcessorFeaturePresent(PF_XMMI64_INSTRUCTIONS_AVAILABLE) != 0) AvailableFeatures |= feature::sse2;
if(IsProcessorFeaturePresent(PF_SSE3_INSTRUCTIONS_AVAILABLE) != 0) AvailableFeatures |= feature::sse3;
}
#else // !(MPT_COMPILER_MSVC && (MPT_ENABLE_ARCH_X86 || MPT_ENABLE_ARCH_AMD64))
Info::Info()
{
return;
}
#endif // MPT_COMPILER_MSVC && (MPT_ENABLE_ARCH_X86 || MPT_ENABLE_ARCH_AMD64)
const Info & Info::Get()
{
static Info info;
return info;
}
struct InfoInitializer
{
InfoInitializer()
{
Info::Get();
}
};
static InfoInitializer g_InfoInitializer;
void EnableAvailableFeatures()
{
EnabledFeatures = Info::Get().AvailableFeatures;
}
#endif // MPT_ENABLE_ARCH_INTRINSICS
uint32 GetMinimumFeatures()
{
uint32 flags = 0;
#ifdef MPT_ENABLE_ARCH_INTRINSICS
#if MPT_COMPILER_MSVC
#if defined(_M_X64)
flags |= feature::lm | feature::sse | feature::sse2;
#elif defined(_M_IX86)
#if defined(_M_IX86_FP)
#if (_M_IX86_FP >= 2)
flags |= feature::sse | feature::sse2;
#elif (_M_IX86_FP == 1)
flags |= feature::sse;
#endif
#endif
#endif
#if defined(__AVX__)
flags |= feature::avx;
#endif
#if defined(__AVX2__)
flags |= feature::avx2;
#endif
#endif
#endif // MPT_ENABLE_ARCH_INTRINSICS
return flags;
}
} // namespace CPU
OPENMPT_NAMESPACE_END
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