https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62630
--- Comment #17 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- On Fri, 20 Feb 2015, mircea.namolaru at inria dot fr wrote: > Yes, but it seems to me that the cast (not in the original code) should > not be generated at all if it could not be guaranteed that the casted-to > type is larger enough to accommodate it. Otherwise you introduce a cast > from a longer signed type to a shorter signed one whose behaviour is > undefined by the C standard and was not in the original code. Such casts have defined semantics in GNU C (and presumably in GIMPLE). (In ISO C, "either the result is implementation-defined or an implementation-defined signal is raised" - not undefined behavior.)
