[Bug rtl-optimization/118623] [12/13/14/15 regression] Miscompile with -O2/3 and -O0/1 since r12-7751-g919fbffef07555

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118623

--- Comment #14 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
So, if (reg:CCC flags) being non-zero in RTL means nc and (reg:CCC flags) being
zero in RTL means c, shouldn't *bt<mode> be using (compare:CCC (zero_extract
...) (const_int 1)) rather than 0?