this fast call will give one an attribute. for more info about attribute pls see chapter 1 of qjfx (i am not sure if i am correct. i feel very tired today. i drive all day for about 540 km). ming On Tuesday 03 June 2003 01:41, you wrote: > Hi,guys, > in I386, "#define FASTCALL(x) x __attribute__((regparm(3)))" > how to explain this macro? > Best Regards > Ouyang Kai