[Bug tree-optimization/97325] [11 Regression] wrong code with __builtin_ffs() at -O2

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97325

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Looking at the evrp dump, I see
EVRP:hybrid: RVRP found singleton 0
EVRP:hybrid: RVRP found singleton 0
EVRP:hybrid: RVRP found singleton 0

Value ranges after Early VRP:

_1: short unsigned int VARYING
_2: int [0, 65535]
_3: int [-65535, 0]
: int [0, 32]
: long long unsigned int [0, 0]
c_6(D): long long unsigned int VARYING
: long long unsigned int [0, 32]

These entries with nothing before : look confusing...