------- Comment #9 from ppr at melexis dot com 2008-09-18 10:20 ------- (In reply to comment #8) > I think this code is invalid. I seem to recall the argument that it's > undefined behavior to increment or decrement a pointer to 0.
Well, the pointer is not NULL initially, it's just decremented until it reaches zero. I agree this code doesn't make much sense in i686-pc environment, but I've discovered the issue while working with GCC port for 16-bit microcontroller. The routine is used to calculate ROM checksum and address 0 is a perfectly valid address at this target. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37569
