------- Additional Comments From joseph at codesourcery dot com 2005-01-06 18:03 ------- Subject: Re: avr-gcc crashes when using shifts with negative shift count
On Thu, 6 Jan 2005, bjoern dot m dot haase at web dot de wrote: > It seems that the standard says that shift operations with negative shift > count > are supposed to yield an "unspecified" result. Undefined, not unspecified. > Is there some more specific convention for gcc on how to behave in these > cases? For some other cases of runtime undefined behavior we generate an abort (with a warning that we are doing so). This is what we do for va_arg with types changed by the default argument promotions, and for calls to functions cast to incompatible types. We could do it for negative or too-wide shifts as well if we wish, either generally or for the specific targets for which they are problems. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19293
