Mega Code Archive
How to multiply big integer values
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Title: How to multiply big integer values
type
IntNo = record
Low32, Hi32: DWORD;
end;
function Multiply(p, q: DWORD): IntNo;
var
x: IntNo;
begin
asm
MOV EAX,[p]
MUL [q]
MOV [x.Low32],EAX
MOV [x.Hi32],EDX
end;
Result := x
end;
// Test the above with:
var
r: IntNo;
begin
r := Multiply(40000000, 80000000);
ShowMessage(IntToStr(r.Hi32) + ', ' + IntToStr(r.low32))
end;
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