C++/CLIでSIMDサポートを調べる

Simd.cpp

#include "Simd.h"
#include "Windows.h"

using namespace SharpDX::SIMD;

#pragma unmanaged

void getCpuId(unsigned int* _ecx, unsigned int* _edx)
{
	unsigned int output_ecx;
	unsigned int output_edx;
	__asm
	{
		mov		eax, 1;
		cpuid;
		mov		output_ecx, ecx;
		mov		output_edx, edx;
	}
	*_ecx = output_ecx;
	*_edx = output_edx;
}

#pragma managed

void Simd::check()
{
	// by windows.h
	mmx = 1 == IsProcessorFeaturePresent(PF_MMX_INSTRUCTIONS_AVAILABLE);
	sse = 1 == IsProcessorFeaturePresent(PF_XMMI_INSTRUCTIONS_AVAILABLE);
	sse2 = 1 == IsProcessorFeaturePresent(PF_XMMI64_INSTRUCTIONS_AVAILABLE);
	sse3 = 1 == IsProcessorFeaturePresent(PF_SSE3_INSTRUCTIONS_AVAILABLE);
	// by cpuid
	unsigned int output_edx;
	unsigned int output_ecx;
	getCpuId(&output_ecx, &output_edx);
	mmx = (output_edx & 0x00800000) > 0;
	sse = (output_edx & 0x02000000) > 0;
	sse2 = (output_edx & 0x04000000) > 0;
	sse3 = (output_ecx & 0x00000001) > 0;
	sse4_1 = (output_ecx & 0x00080000) > 0;
	sse4_2 = (output_ecx & 0x00100000) > 0;
}

bool Simd::MmxAvailable::get()
{
	if (!checked)
	{
		check();
	}
	return mmx;
}

bool Simd::SseAvailable::get()
{
	if (!checked)
	{
		check();
	}
	return sse;
}

bool Simd::Sse2Available::get()
{
	if (!checked)
	{
		check();
	}
	return sse2;
}

bool Simd::Sse3Available::get()
{
	if (!checked)
	{
		check();
	}
	return sse3;
}

bool Simd::Sse4_1Available::get()
{
	if (!checked)
	{
		check();
	}
	return sse4_1;
}

bool Simd::Sse4_2Available::get()
{
	if (!checked)
	{
		check();
	}
	return sse4_2;
}

Simd.h

#pragma once
#include "Windows.h"
namespace SharpDX
{
	namespace SIMD
	{
		public ref class Simd
		{
		internal:
			static bool mmx;
			static bool sse;
			static bool sse2;
			static bool sse3;
			static bool sse4_1;
			static bool sse4_2;
			static void check();
			static bool checked;
		public:
			static property bool MmxAvailable
			{
				bool get();
			}
			static property bool SseAvailable
			{
				bool get();
			}
			static property bool Sse2Available
			{
				bool get();
			}
			static property bool Sse3Available
			{
				bool get();
			}
			static property bool Sse4_1Available
			{
				bool get();
			}
			static property bool Sse4_2Available
			{
				bool get();
			}
		};
	}
}