Mega Code Archive
How to check MMX 3DKnow Function is present
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Title: How to check MMX / 3DKnow Function is present
Question: How can i check, if MMX or 3DKnow is present...
Answer:
Sorry, i'm german. So i may write bad english but i'll trying that.
Do you know how to check if MMX feature is present on your processor?`
That's my own procedure and works fine under Windows9x. I haven't tested
it under WindowsNT systems.....
Function IsMMX:INTEGER;
var bMMX:BOOLEAN;
BEGIN
try;
// Prfen ob MMX vorhanden ist
bMMX := false;
Asm
push eax // Register retten / rescure register
push ebx
push ecx
push edx
pushfd // Erweiterte Flags holen / catch flags
pop eax // In EAX speichern / Store EAX
mov ebx,eax // In EBX speichern / Store EBX
xor eax,$00200000 // Bit 21 negieren push eax
popfd
pushfd // Erweiterte Flags holen / receive Extendet Flag
pop eax // In EAX speichern / store EAX
xor eax,ebx // Wenn sich BIT 21 schreiben lt, ist EAX != 0 / if it can write to 21th bit, EAX is zero.
je @NoMMX // Der Befehl CPUID wird nicht untersttzt / cmd is unsupported
mov eax,$01 // Feature Flags anfragen / detect feature flags
// _emit $0F // $0F, $A2 CPUID Befehl // cmd
// _emit $A2
test edx,$800000 // MMX ist vorhanden wenn Bit 23 gesetzt ist // MMX is detected if Bit23 is set.
jz @NoMMX
mov BYTE ptr[bMMX],1
@NoMMX:
pop edx
pop ecx
pop ebx
pop eax
END;
except;
result:=-1;
exit;
END;
result:=1;
END;
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