diff --git a/LEGO1/mxdirectx/legodxinfo.cpp b/LEGO1/mxdirectx/legodxinfo.cpp index 3d422d6f..6241b76a 100644 --- a/LEGO1/mxdirectx/legodxinfo.cpp +++ b/LEGO1/mxdirectx/legodxinfo.cpp @@ -252,15 +252,15 @@ int LegoDeviceEnumerate::SupportsCPUID() #ifdef _MSC_VER #if defined(_M_IX86) __asm { - xor eax, eax ; Zero EAX register - pushfd ; Push EFLAGS register value on the stack - or dword ptr[esp], 0x200000 ; Set bit 0x200000: Able to use CPUID instruction (Pentium+) - popfd ; Write the updated value into the EFLAGS register - pushfd ; Push EFLAGS register value on the stack (again) - btr dword ptr[esp], 0x15 ; Test bit 0x15 (21) and reset (set CF) - adc eax, eax ; Add with carry: EAX = EAX + EAX + CF = CF - popfd ; Push EFLAGS register value on the stack (again, and makes sure the stack remains the same) - mov has_cpuid, eax ; Save eax into C variable + xor eax, eax ; Zero EAX register + pushfd ; Push EFLAGS register value on the stack + or dword ptr[esp], 0x200000 ; Set bit 0x200000: Able to use CPUID instruction (Pentium+) + popfd ; Write the updated value into the EFLAGS register + pushfd ; Push EFLAGS register value on the stack (again) + btr dword ptr[esp], 0x15 ; Test bit 0x15 (21) and reset (set CF) + adc eax, eax ; Add with carry: EAX = EAX + EAX + CF = CF + popfd ; Push EFLAGS register value on the stack (again, and makes sure the stack remains the same) + mov has_cpuid, eax ; Save eax into C variable } #elif defined(_M_X64) has_cpuid = 1;