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Match LegoDeviceEnumerate::SupportsMMX (#1443)

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* Match `LegoDeviceEnumerate::SupportsMMX`

* Fix indent
This commit is contained in:
Christian Semmler 2025-05-07 15:46:21 -07:00 committed by GitHub
parent 2cab039a5f
commit f851103d48
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GPG Key ID: B5690EEEBB952194
1 changed files with 40 additions and 37 deletions
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77
LEGO1/mxdirectx/legodxinfo.cpp
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@ -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;
}
@ -249,15 +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;