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/***************************************************************************
*
* DetectMMX.cpp
* by Darryl Agostinelli March 4, 2000
*
* Code was adopted from Intel web page
*
*/
#include "Core/precomp.h"
#include "API/Core/System/system.h"
#include "API/Core/System/cl_assert.h"
static bool do_mmx_test();
bool CL_System::detect_mmx()
{
static bool has_mmx = false;
static bool first_time = true;
if (first_time)
{
first_time = false;
has_mmx = do_mmx_test();
}
return has_mmx;
}
static bool do_mmx_test()
{
#ifdef USE_I386_ASSEMBLER
#ifdef __MSC__
unsigned long RegEDX;
try
{
_asm
{
mov eax, 1 // set up CPUID to return processor version and features
// 0 = vendor string, 1 = version info, 2 = cache info
CPUID // code bytes = 0fh, 0a2h
mov RegEDX, edx // features returned in edx
}
}
catch(...) // catch everything
{
return false; // processor does not support CPUID
}
if (RegEDX & 0x800000) // bit 23 is set for MMX technology
{
try { _asm {emms} } // try executing the MMX instruction "emms"
catch(...) { return false; }
}
else
return false; // processor supports CPUID but does not support MMX technology
// if we get here, it means the processor has MMX technology but
// floating-point emulation is on; so MMX technology is unavailable
return true;
#elif __GNUC__
int edx=0;
try
{
asm(
"mov 1,%%eax \n" //Get ready for CPUID
"CPUID \n" //Access CPUID
:"=d"(edx)
);
}
catch(...) //Catch all
{
return false;
}
if (edx & 0x800000)
{
try{ asm("emms"); }
catch(...) {return false;}
}
else
return false;
return true;
#elif __BORLANDC__
//This is for detecting assembly when using the Borland compilers
//If you do not have TASM then this will not compile
//If you do have TASM then uncomment the code below, otherwise ignore it
#ifdef USE_TASM
int RegEDX=0;
try
{
asm
{
mov eax, 1
CPUID
mov RegEDX, edx
}
}
catch(...) {return false;}
if (RegEDX & 0x800000)
{
try{asm{emms}}
catch(...) {return false;}
}
else
return false;
return true;
#else
std::cout<<"Support to detect this has not been compiled in. Please check source(detect_mmx.cpp)"<<std::endl;
return false;
#endif //Endif USE_TASM
#else
cl_info(0, "CL_System::detect_mmx() not implemented under your OS/Compiler/Architecture.");
return false;
#endif
#else
return false;
#endif //End USE_I386_ASSEMBLER
}
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