------- Comment #1 from pluto at agmk dot net 2006-04-22 08:23 -------
(In reply to comment #0)
> int b = 0X80000000;
> if ((b - 10) < 0)
b - 10 is 0xff(...)7ffffff6 and this is an integer overflow.
[ cite: c++ standard / $5.5 ]
if during the evaluation of an expression the result isn't mathematically
defined nor in the range of representable values for its type the behaviuor
is undefined, unless such an expression is a constant expression, in which
case the program is ill-formed. (...)
[ /cite ]
so, use -fwrapv (man g++) to get not quite correct behaviour.
--
pluto at agmk dot net changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |pluto at agmk dot net
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27257
