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> On Thu, 12 Mar 1998 14:07:26 -0800 (PST), art@acc.com (Art Berggreen) wrote: > >> subq.w #1,%a1 > >> /* ^ note the size spezifier here 16 bit !!!!!!!!!!!!!! */ > >Arithmetic operations on 68k address registers are always promoted to > >32 bits. > `sign extended' would be more accurate. > According the the programmer's guide, when an address register is the > source of a word operation, only the low 16-bits are used. When an > address register is the destination, the operands are sign-extended > to 32-bits. Wouldn't this be a bug, since I declared it with 'unsigned long *bar;' ? BTW: It _must_ be a bug, because the program runs fine with subq.l and crashes with subq.w ;-)