重发...新手请教 while语句问题 语句, 新手, 请教

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请教各位大虾 VHDL中的while语句怎么用 为何我按教程写出来的语句 max+plus2编译不过去

错误是：‘for loops’are not supported;

我的代码是：USE IEEE.STD_LOGIC_1164.ALL;

ENTITY W IS
PORT(numA,numB:IN integer range 0 to 128;
  dout:OUT integer range 0 to 128);
END W;

ARCHITECTURE W1 OF W IS

BEGIN
 ROCESS(numA,numB)
  VARIABLE x:integer range 0 to 128;
  VARIABLE y:integer range 0 to 128;
  BEGIN
   x:=numA;
   y:=numB;
   LOOP1: WHILE (x/=y)
   LOOP
   IF x<y THEN
    y:=y-x;
   ELSE
    x:=x-y;
   END IF;
   END LOOP loop1;
   dout<=x;
  END PROCESS;
END;
 
求教....