https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98863
--- Comment #35 from Richard Biener <rguenth at gcc dot gnu.org> --- So on the gcc-10 branch with 4311ae206da1, 5ea7be5068f17, 99c96e797d9662c8, 99dafea9bfebb and 327ec3ea29b58 cherry-picked we top out at 2.5GB and RTL forwprop is not measuably increasing RSS footage. This makes it a GCC 11 regression and given that fwprop is enabled at -O1 (and I guess we can't really disable it there) we have to care about the "insanely large" testcases.