------- Comment #6 from rguenth at gcc dot gnu dot org 2009-10-05 12:02 -------
Actually the testcase is invalid.
uint32 res = ((uint16)(cpu->gprs[12] >> 16) * (uint16)(cpu->gprs[16]
>> 16));
performs a signed multiplication which invokes undefined behavior if it
overflows. Thus the compiler rightfully can assume that the result can
be converted to a positive signed value.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |INVALID
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41577
