[Bug target/78037] Incorrect code generated at optimization level -O2 for tzcnt and binary and

[nlescoua at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78037

--- Comment #8 from Nicolas Le Scouarnec <nlescoua at gmail dot com> ---
The same problem may be present in lzcnt which is also expanded as
__builtin_clz which is also undefined if 0.
http://www.felixcloutier.com/x86/LZCNT.html