Function inverse_ballot 

pub fn inverse_ballot(value: u64) -> bool

🔬This is a nightly-only experimental API. (stdarch_amdgpu #149988)

Available on target_arch=amdgpu only.

Indexes into the value with the current lane id and returns for each lane if the corresponding bit is set.

While ballot converts a bool to a mask, inverse_ballot converts a mask back to a bool. This means inverse_ballot(ballot(b)) == b. The inverse of ballot(inverse_ballot(value)) ~= value is not always true as inactive lanes are set to zero by ballot.