On Sun, Dec 8, 2013 at 9:29 AM, Ian Lance Taylor <iant@xxxxxxxxxx> wrote: > On Sat, Dec 7, 2013 at 1:48 AM, Bin.Cheng <amker.cheng@xxxxxxxxx> wrote: >> >> I just found some GIMPLE like below is generated during boostrap gcc >> for x86, tree-vect-loop.c >> >> >> <bb 637>: >> # group_size_1432 = PHI <1(497), group_size_1017(660)> >> # scalar_dest_1287 = PHI <scalar_dest_1228(497), scalar_dest_1012(660)> >> ratio_1497 = group_size_1432 / 0; >> goto <bb 501>; >> >> The compilation ends fine, but what is the division by 0? > > Pretty hard to say without more information. I just tried, and I > don't see it myself. I would guess that some optimization split out > the ratio == 0 case for some reason. It disappeared with Richard's checkin r205730. Also I am not sure is why the rest of compiler can live with that code. The configuration option for me is : --disable-nls --disable-libmudflap --disable-libada --disable-libssp --disable-libquadmath --disable-libgomp --disable-libffi --disable-libstdcxx-pch --disable-tls --with-gnu-as --with-gnu-ld ... --enable-languages=c,c++ Thanks, bin > > Ian -- Best Regards.
