[Bug c/64255] [5 Regression] failures with -O2 optimization on i >= 0 ? (unsigned long) i : - (unsigned long) i

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64255

--- Comment #7 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
-fno-if-conversion seems to help.