https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125571
--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> --- At -O1 we have, besides SSA rewrite tree SSA rewrite : 286.87 ( 72%) 32M ( 4%) tree FRE : 72.03 ( 18%) 10M ( 1%) TOTAL : 399.91 730M 398.93user 0.78system 6:40.00elapsed 99%CPU (0avgtext+0avgdata 1343812maxresident)k 4888inputs+0outputs (21major+395814minor)pagefaults 0swaps I think it's worth recognizing this as a bug despite "non-optimal" source form. At least at -O0 and -O1 (at -O0 also with -g added). The complexity arises because of how we ensure correctness with setjmp by using abnormal edges which blows up the number of edges and, with a large number of BBs with setjmp we'll have the abnormal dispatcher as a block with very high in- and out degree.
