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Improve SIMD detection (#72)

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Anders Jenbo 2025-05-12 22:26:23 +02:00 committed by GitHub
parent a1c4897e5e
commit 7aac7353ff
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2 changed files with 38 additions and 61 deletions
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95
LEGO1/mxdirectx/legodxinfo.cpp
View File

@ -171,7 +171,7 @@ int LegoDeviceEnumerate::FUN_1009d0d0()
int i = 0;
int j = 0;
int k = -1;
int cpu_mmx = SupportsMMX();
bool cpu_mmx = SupportsSIMD();
for (list<MxDriver>::iterator it = m_list.begin(); it != m_list.end(); it++, i++) {
@ -199,64 +199,49 @@ int LegoDeviceEnumerate::FUN_1009d0d0()
// FUNCTION: CONFIG 0x00402930
// FUNCTION: LEGO1 0x1009d1a0
// FUNCTION: BETA10 0x1011cf54
int LegoDeviceEnumerate::SupportsMMX()
bool LegoDeviceEnumerate::SupportsSIMD()
{
int supports_mmx = SupportsCPUID();
if (supports_mmx) {
#ifdef _MSC_VER
#if defined(_M_IX86)
__asm {
push ebx
mov eax, 0x0 ; EAX=0: Highest Function Parameter and Manufacturer ID
#if _MSC_VER > 1100
cpuid ; Run CPUID
#else
__emit 0x0f
__emit 0xa2
#endif
mov eax, 0x1 ; EAX=1: Processor Info and Feature Bits (unused)
#if _MSC_VER > 1100
cpuid ; Run CPUID
#else
__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
}
#elif defined(_M_IX64)
supports_mmx = 1;
#else
supports_mmx = 0;
#endif
#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
#if defined(__x86_64__) || defined(_M_X64) || defined(__aarch64__) || defined(_M_ARM64)
// All x86_64 and 64-bit ARM CPUs support at least SSE2 or NEON
return true;
#elif defined(__i386__) || defined(_M_IX86)
// 32-bit x86 - need to use CPUID to check for MMX or SSE
if (!SupportsCPUID()) {
return false;
}
return supports_mmx;
int edx;
#if defined(_MSC_VER) && _MSC_VER >= 1310
int cpuInfo[4];
__cpuid(cpuInfo, 1);
edx = cpuInfo[3];
#else
__asm__ __volatile__("movl $1, %%eax\n\t"
"cpuid\n\t"
: "=d"(edx)
:
: "%eax", "%ebx", "%ecx");
#endif
return (edx & (1 << 23)) != 0; // Bit 23: MMX
#elif defined(__arm__) && defined(__ANDROID__)
// Runtime check for NEON on 32-bit ARM (using Android NDK)
return android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_NEON;
#else
// Prevent unsupported builds
#error "Unsupported platform: SIMD feature detection not implemented"
#endif
}
// FUNCTION: CONFIG 0x00402970
// FUNCTION: LEGO1 0x1009d1e0
// FUNCTION: BETA10 0x1011cf97
int LegoDeviceEnumerate::SupportsCPUID()
bool LegoDeviceEnumerate::SupportsCPUID()
{
#if defined(_M_X64) || defined(__x86_64__) || defined(__amd64__)
return true;
#elif defined(_M_IX86) || defined(__i386__)
int has_cpuid;
#ifdef _MSC_VER
#if defined(_M_IX86)
__asm {
xor eax, eax ; Zero EAX register
pushfd ; Push EFLAGS register value on the stack
@ -268,13 +253,7 @@ int LegoDeviceEnumerate::SupportsCPUID()
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;
#else
has_cpuid = 0;
#endif
#else
#if defined(__i386__)
__asm__("xorl %%eax, %%eax\n\t" // Zero EAX register
"pushfl\n\t" // Push EFLAGS register value on the stack
"orl $0x200000, (%%esp)\n\t" // Set bit 0x200000: Able to use CPUID instruction (Pentium+)
@ -285,13 +264,11 @@ int LegoDeviceEnumerate::SupportsCPUID()
"popfl" // Push EFLAGS register value on the stack (again, and makes sure the stack remains the same)
: "=a"(has_cpuid) // has_cpuid == EAX
);
#elif defined(__x86_64__) || defined(__amd64__)
has_cpuid = 1;
#else
has_cpuid = 0;
#endif
#endif
return has_cpuid;
#else
return false;
#endif
}
// FUNCTION: CONFIG 0x004029a0

4
LEGO1/mxdirectx/legodxinfo.h
View File

@ -15,8 +15,8 @@ public:
int FormatDeviceName(char* p_buffer, const MxDriver* p_ddInfo, const Direct3DDeviceInfo* p_d3dInfo) const;
int BETA_1011cc65(int p_idx, char* p_buffer);
int FUN_1009d0d0();
static int SupportsMMX();
static int SupportsCPUID();
static bool SupportsSIMD();
static bool SupportsCPUID();
int FUN_1009d210();
unsigned char DriverSupportsRequiredDisplayMode(MxDriver& p_driver);
unsigned char FUN_1009d3d0(Direct3DDeviceInfo& p_device);