https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80775
--- Comment #2 from David Binderman <dcb314 at hotmail dot com> --- /home/dcb/gcc/results.247811/bin/gcc /home/dcb/gcc/results.247856/bin/gcc bug355.c:4:1: error: extra outgoing edge 39->40 bug355.c:4:1: internal compiler error: verify_flow_info failed /home/dcb/gcc/results.247916/bin/gcc bug355.c:4:1: error: extra outgoing edge 39->40 bug355.c:4:1: internal compiler error: verify_flow_info failed /home/dcb/gcc/results.247966/bin/gcc bug355.c:4:1: internal compiler error: Segmentation fault So revision 247811 looks fine, then 247856 looks wrong, but in a different way and by the time we get to 247966, it's gone properly wrong.