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/*
** ClanLib SDK
** Copyright (c) 1997-2005 The ClanLib Team
**
** This software is provided 'as-is', without any express or implied
** warranty. In no event will the authors be held liable for any damages
** arising from the use of this software.
**
** Permission is granted to anyone to use this software for any purpose,
** including commercial applications, and to alter it and redistribute it
** freely, subject to the following restrictions:
**
** 1. The origin of this software must not be misrepresented; you must not
** claim that you wrote the original software. If you use this software
** in a product, an acknowledgment in the product documentation would be
** appreciated but is not required.
** 2. Altered source versions must be plainly marked as such, and must not be
** misrepresented as being the original software.
** 3. This notice may not be removed or altered from any source distribution.
**
** Note: Some of the libraries ClanLib may link to may have additional
** requirements or restrictions.
**
** File Author(s):
**
** 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"
#include "API/Core/System/log.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
CL_Log::log("debug", "Support to detect this has not been compiled in.");
return false;
#endif //Endif USE_TASM
#else
// Not implemented
return false;
#endif
#else
return false;
#endif //End USE_I386_ASSEMBLER
}
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