diff --git a/LEGO1/mxdirectx/legodxinfo.cpp b/LEGO1/mxdirectx/legodxinfo.cpp index eb511f2b..3d422d6f 100644 --- a/LEGO1/mxdirectx/legodxinfo.cpp +++ b/LEGO1/mxdirectx/legodxinfo.cpp @@ -201,42 +201,45 @@ int LegoDeviceEnumerate::FUN_1009d0d0() // FUNCTION: BETA10 0x1011cf54 int LegoDeviceEnumerate::SupportsMMX() { - if (!SupportsCPUID()) { - return 0; - } - int supports_mmx; + int supports_mmx = SupportsCPUID(); + + if (supports_mmx) { #ifdef _MSC_VER - __asm { - mov eax, 0x0 ; EAX=0: Highest Function Parameter and Manufacturer ID + __asm { + push ebx + mov eax, 0x0 ; EAX=0: Highest Function Parameter and Manufacturer ID #if _MSC_VER > 1100 - cpuid ; Run CPUID + cpuid ; Run CPUID #else - __emit 0x0f - __emit 0xa2 + __emit 0x0f + __emit 0xa2 #endif - mov eax, 0x1 ; EAX=1: Processor Info and Feature Bits (unused) + mov eax, 0x1 ; EAX=1: Processor Info and Feature Bits (unused) #if _MSC_VER > 1100 - cpuid ; Run CPUID + cpuid ; Run CPUID #else - __emit 0x0f - __emit 0xa2 + __emit 0x0f + __emit 0xa2 +#endif + xor eax, eax ; Zero EAX register + bt edx, 0x17 ; Test bit 0x17 (23): MMX instructions (64-bit SIMD) (Store in CF) + adc eax, eax ; Add with carry: EAX = EAX + EAX + CF = CF + pop ebx + mov supports_mmx, eax ; Save eax into C variable + } +#else + __asm__("movl $0x0, %%eax\n\t" // EAX=0: Highest Function Parameter and Manufacturer ID + "cpuid\n\t" // Run CPUID\n" + "mov $0x1, %%eax\n\t" // EAX=1: Processor Info and Feature Bits (unused) + "cpuid\n\t" // Run CPUID + "xorl %%eax, %%eax\n\t" // Zero EAX register + "btl $0x15, %%edx\n\t" // Test bit 0x17 (23): MMX instructions (64-bit SIMD) (Store in CF) + "adc %%eax, %%eax" // Add with carry: EAX = EAX + EAX + CF = CF + : "=a"(supports_mmx) // supports_mmx == EAX + ); #endif - xor eax, eax ; Zero EAX register - bt edx, 0x17 ; Test bit 0x17 (23): MMX instructions (64-bit SIMD) (Store in CF) - adc eax, eax ; Add with carry: EAX = EAX + EAX + CF = CF - mov supports_mmx, eax ; Save eax into C variable } -#else - __asm__("movl $0x0, %%eax\n\t" // EAX=0: Highest Function Parameter and Manufacturer ID - "cpuid\n\t" // Run CPUID\n" - "mov $0x1, %%eax\n\t" // EAX=1: Processor Info and Feature Bits (unused) - "cpuid\n\t" // Run CPUID - "xorl %%eax, %%eax\n\t" // Zero EAX register - "btl $0x15, %%edx\n\t" // Test bit 0x17 (23): MMX instructions (64-bit SIMD) (Store in CF) - "adc %%eax, %%eax" // Add with carry: EAX = EAX + EAX + CF = CF - : "=a"(supports_mmx) // supports_mmx == EAX - ); -#endif + return supports_mmx; }