[fpc-pascal] RunError(215) occurs only in win 64 bit, not win 32 bit

[Dennis]

When I compiled the following simply programs using Lazarus 1.8  fpc 
3.0.4 Win 64, run it, it will throws RunError(215) Arithmetic overflow 
error.

However, if I compile and run the same in Lazarus 1.8 fpc 3.0.4 win 32, 
it won't raise the RunError (215).
Why???


program test64bit;
{$mode objfpc}{$H+}
{$OVERFLOWCHECKS ON}
var
   LW1, LW2 : array[false..true] of LongWord;
   c : currency;
   aBoolean : Boolean;
begin
   LW1[false] := 5;
   LW1[true] := 5;

   LW2[false] := 10;
   LW2[true] := 10;
   c := 10;
   aBoolean :=  (LW1[true] + LW1[false]) - (LW2[false]+LW2[true]) > c ;
   Writeln('if compiled in 64 bit, a RunError(215) will have occurred 
and it will not reach this line');
   readln;
end.