{
> I was just wondering how to speed up some math-intensive
> routines I've got here. For example, I've got a Function
> that returns the distance between two Objects:
> Function Dist(X1,Y1,X2,Y2 : Integer) : Real;
> begin
> Dist := Round(Sqrt(Sqr(X1-X2)+Sqr(Y1-Y2)));
> end;
> This is way to slow. I know assembly can speed it up, but
> I know nothing about as. so theres the problem. Please
> help me out, any and all source/suggestions welcome!
X1, Y1, X2, Y2 are all Integers. Integer math is faster than Real (just
about anything is). Sqr and Sqrt are not Integer Functions. Try for
fun...
}
Function Dist( X1, Y1, X2, Y2 : Integer) : Real;
Var
XTemp,
YTemp : Integer;
{ the allocation of these takes time. if you don't want that time taken,
make them global With care}
begin
XTemp := X1 - X2;
YTemp := Y1 - Y2;
Dist := Sqrt(XTemp * XTemp + YTemp * YTemp);
end;
{
if you have a math coprocessor or a 486dx, try using DOUBLE instead of
Real, and make sure your compiler is set to compile For 287 (or 387).
}
begin
Writeln('Distance Between (3,9) and (-2,-3) is: ', Dist(3,9,-2,-3) : 6 : 2);
end.