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// stdafx.cpp : source file that includes just the standard includes
// MMXSwarm.pch will be the pre-compiled header
// stdafx.obj will contain the pre-compiled type information
// Also includes utility functions that rarely change.
//
// This is a part of the Microsoft Foundation Classes C++ library.
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// This source code is only intended as a supplement to the
// Microsoft Foundation Classes Reference and related
// electronic documentation provided with the library.
// See these sources for detailed information regarding the
// Microsoft Foundation Classes product.
//
#include "stdafx.h"
#include <windows.h>
#include <stdio.h>
static bool _IsMMX();
bool IsMMX()
{
static bool bMMX = _IsMMX();
return(bMMX);
}
static bool _IsMMX()
{
// This bit flag can get set on calling cpuid
// with register eax set to 1
const int _MMX_FEATURE_BIT = 0x00800000;
DWORD dwFeature = 0;
__try {
_asm {
mov eax,1
cpuid
mov dwFeature,edx
}
} __except ( EXCEPTION_EXECUTE_HANDLER) {
return false;
}
if (dwFeature & _MMX_FEATURE_BIT) {
__try {
__asm {
pxor mm0, mm0
emms
}
} __except (EXCEPTION_EXECUTE_HANDLER) {
return (0);
}
return(true);
}
return false;
}
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